Skel code in place

Update() can now take specialised functions

CONTRIBUTORS.md

@@ -32,3 +32,5 @@ Wails is what it is because of the time and effort given by these great people.
   * [Zámbó, Levente](https://github.com/Lyimmi)
   * [artem](https://github.com/Unix4ever)
   * [Tim Kipp](https://github.com/timkippdev)
+  * [Dmitry Gomzyakov](https://github.com/kyoto44)
+  * [Arthur Wiebe](https://github.com/artooro)

README.md

@@ -12,7 +12,6 @@
    <a href="https://houndci.com"><img src="https://img.shields.io/badge/Reviewed_by-Hound-8E64B0.svg"/></a>
    <a href="https://github.com/avelino/awesome-go" rel="nofollow"><img src="https://cdn.rawgit.com/sindresorhus/awesome/d7305f38d29fed78fa85652e3a63e154dd8e8829/media/badge.svg" alt="Awesome"></a>
    <a href="https://github.com/wailsapp/wails/workflows/release/badge.svg?branch=master" rel="nofollow"><img src="https://github.com/wailsapp/wails/workflows/release/badge.svg?branch=master" alt="Release Pipelines"></a>
-   <a href="https://github.com/wailsapp/wails/workflows/latest-pre/badge.svg?branch=masterr" rel="nofollow"><img src="https://github.com/wailsapp/wails/workflows/latest-pre/badge.svg?branch=master" alt="Pre-Release Pipelines"></a>
 </p>
 
 The traditional method of providing web interfaces to Go programs is via a built-in web server. Wails offers a different approach: it provides the ability to wrap both Go code and a web frontend into a single binary. Tools are provided to make this easy for you by handling project creation, compilation and bundling. All you have to do is get creative!
@@ -57,7 +56,7 @@ _Ubuntu: 16.04, 18.04, 19.04_
 
 _Also succesfully tested on: Zorin 15, Parrot 4.7, Linuxmint 19, Elementary 5, Kali, Neon_, Pop!_OS
 
-#### Arch Linux / ArchLabs
+#### Arch Linux / ArchLabs / Ctlos Linux
 
 `sudo pacman -S webkit2gtk gtk3`
 

app.go

@@ -13,6 +13,7 @@ import (
 	"github.com/wailsapp/wails/lib/ipc"
 	"github.com/wailsapp/wails/lib/logger"
 	"github.com/wailsapp/wails/lib/renderer"
+	wailsruntime "github.com/wailsapp/wails/runtime"
 )
 
 // -------------------------------- Compile time Flags ------------------------------
@@ -20,6 +21,16 @@ import (
 // BuildMode indicates what mode we are in
 var BuildMode = cmd.BuildModeProd
 
+// Runtime is the Go Runtime struct
+type Runtime = wailsruntime.Runtime
+
+// Store is a state store used for syncing with
+// the front end
+type Store = wailsruntime.Store
+
+// CustomLogger is a specialised logger
+type CustomLogger = logger.CustomLogger
+
 // ----------------------------------------------------------------------------------
 
 // App defines the main application struct
@@ -125,7 +136,7 @@ func (a *App) start() error {
 	a.ipc.Start(a.eventManager, a.bindingManager)
 
 	// Create the runtime
-	a.runtime = NewRuntime(a.eventManager, a.renderer)
+	a.runtime = wailsruntime.NewRuntime(a.eventManager, a.renderer)
 
 	// Start binding manager and give it our renderer
 	err = a.bindingManager.Start(a.renderer, a.runtime)

cmd/linux.go

@@ -63,6 +63,8 @@ const (
 	PopOS
 	// Solus distribution
 	Solus
+	// Ctlos Linux distribution
+	Ctlos
 )
 
 // DistroInfo contains all the information relating to a linux distribution
@@ -129,6 +131,8 @@ func parseOsRelease(osRelease string) *DistroInfo {
 		result.Distribution = Arch
 	case "archlabs":
 		result.Distribution = ArchLabs
+	case "ctlos":
+		result.Distribution = Ctlos	
 	case "debian":
 		result.Distribution = Debian
 	case "ubuntu":

cmd/linuxdb.yaml

@@ -193,7 +193,16 @@ distributions:
         name: ArchLabs
         gccversioncommand: *gccdumpversion
         programs: *archdefaultprograms
-        libraries: *archdefaultlibraries        
+        libraries: *archdefaultlibraries
+  ctlos:
+    id: ctlos
+    releases:
+      default:
+        version: default
+        name: Ctlos Linux
+        gccversioncommand: *gccdumpversion
+        programs: *archdefaultprograms
+        libraries: *archdefaultlibraries                
   manjaro:
     id: manjaro
     releases:

cmd/system.go

@@ -276,7 +276,7 @@ func CheckDependencies(logger *Logger) (bool, error) {
 		switch distroInfo.Distribution {
 		case Ubuntu, Debian, Zorin, Parrot, Linuxmint, Elementary, Kali, Neon, Deepin, Raspbian, PopOS:
 			libraryChecker = DpkgInstalled
-		case Arch, ArcoLinux, ArchLabs, Manjaro, ManjaroARM:
+		case Arch, ArcoLinux, ArchLabs, Ctlos, Manjaro, ManjaroARM:
 			libraryChecker = PacmanInstalled
 		case CentOS, Fedora, Tumbleweed, Leap:
 			libraryChecker = RpmInstalled

cmd/templates/angular-template/frontend/src/app/app-routing.module.ts

@@ -5,7 +5,7 @@ const routes: Routes = [];
 
 @NgModule({
   imports: [
-    RouterModule.forRoot(routes)
+    RouterModule.forRoot(routes,{useHash:true})
   ],
   exports: [RouterModule]
 })

cmd/templates/svelte/frontend/.gitignore

@@ -0,0 +1,4 @@
+/node_modules/
+/public/build/
+
+.DS_Store

cmd/templates/svelte/frontend/README.md

@@ -0,0 +1,90 @@
+*Looking for a shareable component template? Go here --> [sveltejs/component-template](https://github.com/sveltejs/component-template)*
+
+---
+
+# svelte app
+
+This is a project template for [Svelte](https://svelte.dev) apps. It lives at https://github.com/sveltejs/template.
+
+To create a new project based on this template using [degit](https://github.com/Rich-Harris/degit):
+
+```bash
+npx degit sveltejs/template svelte-app
+cd svelte-app
+```
+
+*Note that you will need to have [Node.js](https://nodejs.org) installed.*
+
+
+## Get started
+
+Install the dependencies...
+
+```bash
+cd svelte-app
+npm install
+```
+
+...then start [Rollup](https://rollupjs.org):
+
+```bash
+npm run dev
+```
+
+Navigate to [localhost:5000](http://localhost:5000). You should see your app running. Edit a component file in `src`, save it, and reload the page to see your changes.
+
+By default, the server will only respond to requests from localhost. To allow connections from other computers, edit the `sirv` commands in package.json to include the option `--host 0.0.0.0`.
+
+
+## Building and running in production mode
+
+To create an optimised version of the app:
+
+```bash
+npm run build
+```
+
+You can run the newly built app with `npm run start`. This uses [sirv](https://github.com/lukeed/sirv), which is included in your package.json's `dependencies` so that the app will work when you deploy to platforms like [Heroku](https://heroku.com).
+
+
+## Single-page app mode
+
+By default, sirv will only respond to requests that match files in `public`. This is to maximise compatibility with static fileservers, allowing you to deploy your app anywhere.
+
+If you're building a single-page app (SPA) with multiple routes, sirv needs to be able to respond to requests for *any* path. You can make it so by editing the `"start"` command in package.json:
+
+```js
+"start": "sirv public --single"
+```
+
+## Deploying to the web
+
+### With [Vercel](https://vercel.com)
+
+Install `vercel` if you haven't already:
+
+```bash
+npm install -g vercel
+```
+
+Then, from within your project folder:
+
+```bash
+cd public
+vercel deploy --name my-project
+```
+
+### With [surge](https://surge.sh/)
+
+Install `surge` if you haven't already:
+
+```bash
+npm install -g surge
+```
+
+Then, from within your project folder:
+
+```bash
+npm run build
+surge public my-project.surge.sh
+```

cmd/templates/svelte/frontend/package.json.template

@@ -0,0 +1,31 @@
+{
+  "name": "{{.NPMProjectName}}",
+  "author": "{{.Author.Name}}<{{.Author.Email}}>",
+  "scripts": {
+    "build": "rollup -c",
+    "dev": "rollup -c -w",
+    "start": "sirv public"
+  },
+  "devDependencies": {
+    "@babel/core": "^7.11.6",
+    "@babel/plugin-syntax-dynamic-import": "^7.8.3",
+    "@babel/plugin-transform-runtime": "^7.11.5",
+    "@babel/preset-env": "^7.11.5",
+    "@rollup/plugin-commonjs": "^14.0.0",
+    "@rollup/plugin-image": "^2.0.5",
+    "@rollup/plugin-node-resolve": "^8.0.0",
+    "core-js": "^3.6.5",
+    "rollup": "^2.3.4",
+    "rollup-plugin-babel": "^4.4.0",
+    "rollup-plugin-livereload": "^2.0.0",
+    "rollup-plugin-polyfill": "^3.0.0",
+    "rollup-plugin-svelte": "^6.0.0",
+    "rollup-plugin-terser": "^7.0.0",
+    "svelte": "^3.0.0"
+  },
+  "dependencies": {
+    "sirv-cli": "^1.0.0",
+	  "@wailsapp/runtime": "^1.0.10",
+	  "svelte-simple-modal": "^0.6.0"
+  }
+}

cmd/templates/svelte/frontend/public/index.html

@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+	<meta charset='utf-8'>
+	<meta name='viewport' content='width=device-width,initial-scale=1'>
+
+	<title>Svelte app</title>
+
+	<link rel='icon' type='image/png' href='/favicon.png'>
+	<link rel='stylesheet' href='/build/bundle.css'>
+
+	<script defer src='/build/bundle.js'></script>
+</head>
+
+<body>
+</body>
+</html>

cmd/templates/svelte/frontend/rollup.config.js

@@ -0,0 +1,110 @@
+import svelte from 'rollup-plugin-svelte';
+import resolve from '@rollup/plugin-node-resolve';
+import commonjs from '@rollup/plugin-commonjs';
+import livereload from 'rollup-plugin-livereload';
+import { terser } from 'rollup-plugin-terser';
+import image from '@rollup/plugin-image';
+import babel from 'rollup-plugin-babel';
+import polyfill from 'rollup-plugin-polyfill';
+
+const production = !process.env.ROLLUP_WATCH;
+
+function serve() {
+	let server;
+	
+	function toExit() {
+		if (server) server.kill(0);
+	}
+
+	return {
+		writeBundle() {
+			if (server) return;
+			server = require('child_process').spawn('npm', ['run', 'start', '--', '--dev'], {
+				stdio: ['ignore', 'inherit', 'inherit'],
+				shell: true
+			});
+
+			process.on('SIGTERM', toExit);
+			process.on('exit', toExit);
+		}
+	};
+}
+
+export default {
+	input: 'src/main.js',
+	output: {
+		sourcemap: true,
+		format: 'iife',
+		name: 'app',
+		file: 'public/build/bundle.js'
+	},
+	plugins: [
+		image(),
+		svelte({
+			// enable run-time checks when not in production
+			dev: !production,
+			// we'll extract any component CSS out into
+			// a separate file - better for performance
+			css: css => {
+				css.write('bundle.css');
+			}
+		}),
+
+		// If you have external dependencies installed from
+		// npm, you'll most likely need these plugins. In
+		// some cases you'll need additional configuration -
+		// consult the documentation for details:
+		// https://github.com/rollup/plugins/tree/master/packages/commonjs
+		resolve({
+			browser: true,
+			dedupe: ['svelte', 'svelte/transition', 'svelte/internal']
+		}),
+		commonjs(),
+
+		// In dev mode, call `npm run start` once
+		// the bundle has been generated
+		!production && serve(),
+
+		// Watch the `public` directory and refresh the
+		// browser on changes when not in production
+		!production && livereload('public'),
+
+		// Credit: https://blog.az.sg/posts/svelte-and-ie11/
+		babel({
+			extensions: [ '.js', '.jsx', '.es6', '.es', '.mjs', '.svelte', '.html' ],
+			runtimeHelpers: true,
+			exclude: [ 'node_modules/@babel/**', 'node_modules/core-js/**' ],
+			presets: [
+			  [
+				'@babel/preset-env',
+				{
+				  targets: '> 0.25%, not dead, IE 11',
+				  modules: false,
+				  spec: true, 
+				  useBuiltIns: 'usage',
+				  forceAllTransforms: true,
+				  corejs: 3,
+				},
+
+			  ]
+			],
+			plugins: [
+			  '@babel/plugin-syntax-dynamic-import',
+			  [
+				'@babel/plugin-transform-runtime',
+				{
+				  useESModules: true
+				}
+			  ]
+			]
+		  }),
+		  polyfill(['@webcomponents/webcomponentsjs']),
+
+		// If we're building for production (npm run build
+		// instead of npm run dev), minify
+		production && terser()
+	],
+	watch: {
+		clearScreen: false
+	}
+};

cmd/templates/svelte/frontend/src/App.svelte

@@ -0,0 +1,69 @@
+
+
+<script>
+	import Modal from 'svelte-simple-modal';
+	import HelloWorld from './components/HelloWorld.svelte'
+	import logo from './logo.png';
+</script>
+
+<main>
+	<div class="App">
+		<header class="App-header">
+			<Modal>
+				<img src={logo} class="App-logo" alt="logo" />
+				<p>Welcome to your new <code>wails/svelte</code> project.</p>
+				<HelloWorld/>
+			</Modal>
+		</header>
+	</div>
+</main>
+
+<style>
+	:global(body) {
+		margin: 0;
+		font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen",
+			"Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue",
+			sans-serif;
+		-webkit-font-smoothing: antialiased;
+		-moz-osx-font-smoothing: grayscale;
+	}
+
+	code {
+		font-family: source-code-pro, Menlo, Monaco, Consolas, "Courier New", monospace;
+	}
+
+	.App {
+		text-align: center;
+	}
+
+	.App-logo {
+		height: 40vmin;
+		pointer-events: none;
+	}
+
+	@media (prefers-reduced-motion: no-preference) {
+		.App-logo {
+			animation: App-logo-spin infinite 20s linear;
+		}
+	}
+
+	.App-header {
+		background-color: #282c34;
+		min-height: 100vh;
+		display: flex;
+		flex-direction: column;
+		align-items: center;
+		justify-content: center;
+		font-size: calc(10px + 2vmin);
+		color: white;
+	}
+
+	@keyframes App-logo-spin {
+		from {
+			transform: rotate(0deg);
+		}
+		to {
+			transform: rotate(360deg);
+		}
+	}
+</style>

cmd/templates/svelte/frontend/src/components/HelloWorld.svelte

@@ -0,0 +1,18 @@
+<script>
+	import { getContext } from 'svelte';
+	import ModalContent from './ModalContent.svelte'
+	
+	const { open } = getContext('simple-modal');
+
+	const handleOpenModal = () => {
+		window.backend.basic().then((result) => {
+			open(ModalContent, { message: result });
+		});
+	};
+</script>
+
+<main>
+	<p><button on:click={handleOpenModal}>Hello</button></p>
+</main>
+
+<style></style>

cmd/templates/svelte/frontend/src/components/ModalContent.svelte

@@ -0,0 +1,7 @@
+<script>
+	export let message;
+</script> 
+   
+<p>
+	{message}
+</p>

cmd/templates/svelte/frontend/src/main.js

@@ -0,0 +1,13 @@
+import App from './App.svelte';
+
+import * as Wails from '@wailsapp/runtime';
+
+let app;
+
+Wails.Init(() => {
+	app = new App({
+		target: document.body,
+	});
+}); 
+
+export default app;

cmd/templates/svelte/go.mod.template

@@ -0,0 +1,5 @@
+module {{.BinaryName}}
+
+require (
+	github.com/wailsapp/wails {{.WailsVersion}}
+)

cmd/templates/svelte/main.go.template

@@ -0,0 +1,27 @@
+package main
+
+import (
+	"github.com/leaanthony/mewn"
+	"github.com/wailsapp/wails"
+)
+
+func basic() string {
+	return "World!"
+}
+
+func main() {
+	js := mewn.String("./frontend/public/build/bundle.js")
+	css := mewn.String("./frontend/public/build/bundle.css")
+
+	app := wails.CreateApp(&wails.AppConfig{
+		Width:  1024,
+		Height: 768,
+		Title:  "{{.Name}}",
+		JS:     js,
+		CSS:    css,
+		Colour: "#131313",
+	})
+
+	app.Bind(basic)
+	app.Run()
+}

cmd/templates/svelte/template.json

@@ -0,0 +1,14 @@
+{
+  "name": "Svelte",
+  "version": "1.0.0",
+  "shortdescription": "A basic Svelte template",
+  "description": "A basic Svelte template",
+  "install": "npm install",
+  "build": "npm run build",
+  "author": "Tim Kipp <timkipp.22.developer@gmail.com>",
+  "created": "2020-09-06 13:06:10.469848 -0700 PDT m=+213.578828559",
+  "frontenddir": "frontend",
+  "serve": "npm run dev",
+  "bridge": "src",
+  "wailsdir": ""
+}

cmd/templates/vanilla/counter.go

@@ -0,0 +1,46 @@
+package main
+
+import (
+	"math/rand"
+
+	"github.com/wailsapp/wails"
+)
+
+// Counter is what we use for counting
+type Counter struct {
+	r     *wails.Runtime
+	store *wails.Store
+}
+
+// WailsInit is called when the component is being initialised
+func (c *Counter) WailsInit(runtime *wails.Runtime) error {
+	c.r = runtime
+	c.store = runtime.Store.New("Counter", 0)
+	return nil
+}
+
+// RandomValue sets the counter to a random value
+func (c *Counter) RandomValue() {
+	c.store.Set(rand.Intn(1000))
+}
+
+// Increment will increment the counter
+func (c *Counter) Increment() {
+
+	increment := func(data int) int {
+		return data + 1
+	}
+
+	// Update the store using the increment function
+	c.store.Update(increment)
+}
+
+// Decrement will decrement the counter
+func (c *Counter) Decrement() {
+
+	decrement := func(data int) int {
+		return data - 1
+	}
+	// Update the store using the decrement function
+	c.store.Update(decrement)
+}

cmd/templates/vanilla/frontend/src/main.css

@@ -2,20 +2,35 @@
 html, 
 body {
   background-color: white;
-  width: 1024px;
+  color: black;
-  height: 768px;
+  width: 100%;
+  height: 100%;
+  margin: 0;
+}
+
+input {
+  background-color: rgb(254,254,254);
+  color: black;
 }
 
 .container {
   display: block;
   width:100%;
   text-align: center;
-  margin-top: 3rem;
+  margin-top: 1rem;
   font-size: 2rem;
 }
 
 button {
   font-size: 1rem;
+  background-color: white;
+  color: black;
+}
+
+.result {
+  margin-top: 1rem;
+  text-align: center;
+  font-size: 2rem;
 }
 
 .logo {

cmd/templates/vanilla/frontend/src/main.js

@@ -4,6 +4,8 @@ const runtime = require('@wailsapp/runtime');
 // Main entry point
 function start() {
 
+	var mystore = runtime.Store.New('Counter');
+
 	// Ensure the default app div is 100% wide/high
 	var app = document.getElementById('app');
 	app.style.width = '100%';
@@ -13,17 +15,32 @@ function start() {
 	app.innerHTML = `
 	<div class='logo'></div>
 	<div class='container'>
-			<button id='button'>Click Me!</button>
+	<button onClick='window.backend.Counter.Increment()'>
-			<div id='result'/>
+		Increment Counter
+	</button>
+	<button onClick='window.backend.Counter.Decrement()'>
+		Decrement Counter
+		</button>
+	</div>
+	<div class='result'>Counter: <span id='counter'></span></div>
+	<div class='container'>
+		<input id='newCounter' type="number" value="0"/>
+		<button id='setvalue'>Set Counter Value</button>
+		<button onclick='window.backend.Counter.RandomValue()'>Set to Random Value</button>
 	</div>
 	`;
 
-	// Connect button to Go method
+	// Connect counter value button to Go method
-	document.getElementById('button').onclick = function() {
+	document.getElementById('setvalue').onclick = function() {
-		window.backend.basic().then( function(result) {
+		let newValue = parseInt(document.getElementById('newCounter').value,10);
-			document.getElementById('result').innerText = result;
+		mystore.set(newValue);
-		});
 	};
+
+	mystore.subscribe( function(state) {
+		document.getElementById('counter').innerText = state;
+	});
+	
+	mystore.set(0);
 };
 
 // We provide our entrypoint as a callback for runtime.Init

cmd/templates/vanilla/main.go.template

@@ -5,10 +5,6 @@ import (
   "github.com/wailsapp/wails"
 )
 
-func basic() string {
-  return "Hello World!"
-}
-
 func main() {
 
 	js := mewn.String("./frontend/build/main.js")
@@ -22,6 +18,6 @@ func main() {
     CSS:    css,
     Colour: "#131313",
   })
-  app.Bind(basic)
+  app.Bind(&Counter{})
   app.Run()
 }

cmd/version.go

@@ -1,4 +1,4 @@
 package cmd
 
 // Version - Wails version
-const Version = "v1.7.2-pre3"
+const Version = "v1.8.0"

lib/binding/method.go

@@ -196,7 +196,7 @@ func (b *boundMethod) processWailsInit() error {
 	// It must be *wails.Runtime
 	inputName := b.inputs[0].String()
 	b.log.Debugf("WailsInit input type: %s", inputName)
-	if inputName != "*wails.Runtime" {
+	if inputName != "*runtime.Runtime" {
 		return fmt.Errorf("Invalid WailsInit() definition. Expected input to be wails.Runtime, but got %s", inputName)
 	}
 
@@ -219,7 +219,7 @@ func (b *boundMethod) processWailsInit() error {
 }
 
 func (b *boundMethod) processWailsShutdown() error {
-	// We must have only 1 input, it must be *wails.Runtime
+	// We must not have any inputs
 	if len(b.inputs) != 0 {
 		return fmt.Errorf("Invalid WailsShutdown() definition. Expected 0 inputs, but got %d", len(b.inputs))
 	}

lib/renderer/bridge/renderer-mewn.go

@@ -5,5 +5,5 @@ package renderer
 import "github.com/leaanthony/mewn"
 
 func init() {
-  mewn.AddAsset(".", "../../runtime/assets/wails.js", "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")
+  mewn.AddAsset(".", "../../runtime/assets/wails.js", "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")
 }

lib/renderer/webview/memory.go

@@ -0,0 +1,27 @@
+package webview
+
+/*
+#include <stdlib.h>
+*/
+import "C"
+
+import "unsafe"
+
+// This is our allocated C Memory
+var memory []unsafe.Pointer
+
+func saveMemoryReference(mem unsafe.Pointer) {
+	memory = append(memory, mem)
+}
+
+func freeMemory() {
+	for _, mem := range memory {
+		C.free(mem)
+	}
+}
+
+func string2CString(str string) *C.char {
+	result := C.CString(str)
+	saveMemoryReference(unsafe.Pointer(result))
+	return result
+}

lib/renderer/webview/webview.go

@@ -1,166 +1,20 @@
-// Package webview implements Go bindings to https://github.com/zserge/webview C library.
-// It is a modified version of webview.go from that repository
-// Bindings closely repeat the C APIs and include both, a simplified
-// single-function API to just open a full-screen webview window, and a more
-// advanced and featureful set of APIs, including Go-to-JavaScript bindings.
-//
-// The library uses gtk-webkit, Cocoa/Webkit and MSHTML (IE8..11) as a browser
-// engine and supports Linux, MacOS and Windows 7..10 respectively.
-//
 package webview
 
-/*
-#cgo linux openbsd freebsd CFLAGS: -DWEBVIEW_GTK=1 -Wno-deprecated-declarations
-#cgo linux openbsd freebsd pkg-config: gtk+-3.0 webkit2gtk-4.0
-
-#cgo windows CFLAGS: -DWEBVIEW_WINAPI=1 -std=c99
-#cgo windows LDFLAGS: -lole32 -lcomctl32 -loleaut32 -luuid -lgdi32
-
-#cgo darwin CFLAGS: -DWEBVIEW_COCOA=1 -x objective-c
-#cgo darwin LDFLAGS: -framework Cocoa -framework WebKit
-
-#include <stdlib.h>
-#include <stdint.h>
-#define WEBVIEW_STATIC
-#define WEBVIEW_IMPLEMENTATION
-#include "webview.h"
-
-extern void _webviewExternalInvokeCallback(void *, void *);
-
-static inline void CgoWebViewFree(void *w) {
-	free((void *)((struct webview *)w)->title);
-	free((void *)((struct webview *)w)->url);
-	free(w);
-}
-
-static inline void *CgoWebViewCreate(int width, int height, char *title, char *url, int resizable, int debug) {
-	struct webview *w = (struct webview *) calloc(1, sizeof(*w));
-	w->width = width;
-	w->height = height;
-	w->title = title;
-	w->url = url;
-	w->resizable = resizable;
-	w->debug = debug;
-	w->external_invoke_cb = (webview_external_invoke_cb_t) _webviewExternalInvokeCallback;
-	if (webview_init(w) != 0) {
-		CgoWebViewFree(w);
-		return NULL;
-	}
-	return (void *)w;
-}
-
-static inline int CgoWebViewLoop(void *w, int blocking) {
-	return webview_loop((struct webview *)w, blocking);
-}
-
-static inline void CgoWebViewTerminate(void *w) {
-	webview_terminate((struct webview *)w);
-}
-
-static inline void CgoWebViewExit(void *w) {
-	webview_exit((struct webview *)w);
-}
-
-static inline void CgoWebViewSetTitle(void *w, char *title) {
-	webview_set_title((struct webview *)w, title);
-}
-
-static inline void CgoWebViewSetFullscreen(void *w, int fullscreen) {
-	webview_set_fullscreen((struct webview *)w, fullscreen);
-}
-
-static inline void CgoWebViewSetColor(void *w, uint8_t r, uint8_t g, uint8_t b, uint8_t a) {
-	webview_set_color((struct webview *)w, r, g, b, a);
-}
-
-static inline void CgoDialog(void *w, int dlgtype, int flags,
-char *title, char *arg, char *res, size_t ressz, char *filter) {
-	webview_dialog(w, dlgtype, flags,
-	(const char*)title, (const char*) arg, res, ressz, filter);
-}
-
-static inline int CgoWebViewEval(void *w, char *js) {
-	return webview_eval((struct webview *)w, js);
-}
-
-static inline void CgoWebViewInjectCSS(void *w, char *css) {
-	webview_inject_css((struct webview *)w, css);
-}
-
-extern void _webviewDispatchGoCallback(void *);
-static inline void _webview_dispatch_cb(struct webview *w, void *arg) {
-	_webviewDispatchGoCallback(arg);
-}
-static inline void CgoWebViewDispatch(void *w, uintptr_t arg) {
-	webview_dispatch((struct webview *)w, _webview_dispatch_cb, (void *)arg);
-}
-*/
 import "C"
-import (
+
-	"errors"
+// DialogType is an enumeration of all supported system dialog types
-	"runtime"
+type DialogType int
-	"sync"
+
-	"unsafe"
+const (
+	// DialogTypeOpen is a system file open dialog
+	DialogTypeOpen DialogType = iota
+	// DialogTypeSave is a system file save dialog
+	DialogTypeSave
+	// DialogTypeAlert is a system alert dialog (message box)
+	DialogTypeAlert
 )
 
-func init() {
+// WebView is our webview interface
-	// Ensure that main.main is called from the main thread
-	runtime.LockOSThread()
-}
-
-// Open is a simplified API to open a single native window with a full-size webview in
-// it. It can be helpful if you want to communicate with the core app using XHR
-// or WebSockets (as opposed to using JavaScript bindings).
-//
-// Window appearance can be customized using title, width, height and resizable parameters.
-// URL must be provided and can user either a http or https protocol, or be a
-// local file:// URL. On some platforms "data:" URLs are also supported
-// (Linux/MacOS).
-func Open(title, url string, w, h int, resizable bool) error {
-	titleStr := C.CString(title)
-	defer C.free(unsafe.Pointer(titleStr))
-	urlStr := C.CString(url)
-	defer C.free(unsafe.Pointer(urlStr))
-	resize := C.int(0)
-	if resizable {
-		resize = C.int(1)
-	}
-
-	r := C.webview(titleStr, urlStr, C.int(w), C.int(h), resize)
-	if r != 0 {
-		return errors.New("failed to create webview")
-	}
-	return nil
-}
-
-// ExternalInvokeCallbackFunc is a function type that is called every time
-// "window.external.invoke()" is called from JavaScript. Data is the only
-// obligatory string parameter passed into the "invoke(data)" function from
-// JavaScript. To pass more complex data serialized JSON or base64 encoded
-// string can be used.
-type ExternalInvokeCallbackFunc func(w WebView, data string)
-
-// Settings is a set of parameters to customize the initial WebView appearance
-// and behavior. It is passed into the webview.New() constructor.
-type Settings struct {
-	// WebView main window title
-	Title string
-	// URL to open in a webview
-	URL string
-	// Window width in pixels
-	Width int
-	// Window height in pixels
-	Height int
-	// Allows/disallows window resizing
-	Resizable bool
-	// Enable debugging tools (Linux/BSD/MacOS, on Windows use Firebug)
-	Debug bool
-	// A callback that is executed when JavaScript calls "window.external.invoke()"
-	ExternalInvokeCallback ExternalInvokeCallbackFunc
-}
-
-// WebView is an interface that wraps the basic methods for controlling the UI
-// loop, handling multithreading and providing JavaScript bindings.
 type WebView interface {
 	// Run() starts the main UI loop until the user closes the webview window or
 	// Terminate() is called.
@@ -199,175 +53,21 @@ type WebView interface {
 	Exit()
 }
 
-// DialogType is an enumeration of all supported system dialog types
+type ExternalInvokeCallbackFunc func(w WebView, data string)
-type DialogType int
 
-const (
+type Settings struct {
-	// DialogTypeOpen is a system file open dialog
+	// WebView main window title
-	DialogTypeOpen DialogType = iota
+	Title string
-	// DialogTypeSave is a system file save dialog
+	// URL to open in a webview
-	DialogTypeSave
+	URL string
-	// DialogTypeAlert is a system alert dialog (message box)
+	// Window width in pixels
-	DialogTypeAlert
+	Width int
-)
+	// Window height in pixels
-
+	Height int
-const (
+	// Allows/disallows window resizing
-	// DialogFlagFile is a normal file picker dialog
+	Resizable bool
-	DialogFlagFile = C.WEBVIEW_DIALOG_FLAG_FILE
+	// Enable debugging tools (Linux/BSD/MacOS, on Windows use Firebug)
-	// DialogFlagDirectory is an open directory dialog
+	Debug bool
-	DialogFlagDirectory = C.WEBVIEW_DIALOG_FLAG_DIRECTORY
+	// A callback that is executed when JavaScript calls "window.external.invoke()"
-	// DialogFlagInfo is an info alert dialog
+	ExternalInvokeCallback ExternalInvokeCallbackFunc
-	DialogFlagInfo = C.WEBVIEW_DIALOG_FLAG_INFO
-	// DialogFlagWarning is a warning alert dialog
-	DialogFlagWarning = C.WEBVIEW_DIALOG_FLAG_WARNING
-	// DialogFlagError is an error dialog
-	DialogFlagError = C.WEBVIEW_DIALOG_FLAG_ERROR
-)
-
-var (
-	m     sync.Mutex
-	index uintptr
-	fns   = map[uintptr]func(){}
-	cbs   = map[WebView]ExternalInvokeCallbackFunc{}
-)
-
-type webview struct {
-	w unsafe.Pointer
-}
-
-var _ WebView = &webview{}
-
-func boolToInt(b bool) int {
-	if b {
-		return 1
-	}
-	return 0
-}
-
-// NewWebview creates and opens a new webview window using the given settings. The
-// returned object implements the WebView interface. This function returns nil
-// if a window can not be created.
-func NewWebview(settings Settings) WebView {
-	if settings.Width == 0 {
-		settings.Width = 640
-	}
-	if settings.Height == 0 {
-		settings.Height = 480
-	}
-	if settings.Title == "" {
-		settings.Title = "WebView"
-	}
-	w := &webview{}
-	w.w = C.CgoWebViewCreate(C.int(settings.Width), C.int(settings.Height),
-		C.CString(settings.Title), C.CString(settings.URL),
-		C.int(boolToInt(settings.Resizable)), C.int(boolToInt(settings.Debug)))
-	m.Lock()
-	if settings.ExternalInvokeCallback != nil {
-		cbs[w] = settings.ExternalInvokeCallback
-	} else {
-		cbs[w] = func(w WebView, data string) {}
-	}
-	m.Unlock()
-	return w
-}
-
-func (w *webview) Loop(blocking bool) bool {
-	block := C.int(0)
-	if blocking {
-		block = 1
-	}
-	return C.CgoWebViewLoop(w.w, block) == 0
-}
-
-func (w *webview) Run() {
-	for w.Loop(true) {
-	}
-}
-
-func (w *webview) Exit() {
-	C.CgoWebViewExit(w.w)
-}
-
-func (w *webview) Dispatch(f func()) {
-	m.Lock()
-	for ; fns[index] != nil; index++ {
-	}
-	fns[index] = f
-	m.Unlock()
-	C.CgoWebViewDispatch(w.w, C.uintptr_t(index))
-}
-
-func (w *webview) SetTitle(title string) {
-	p := C.CString(title)
-	defer C.free(unsafe.Pointer(p))
-	C.CgoWebViewSetTitle(w.w, p)
-}
-
-func (w *webview) SetColor(r, g, b, a uint8) {
-	C.CgoWebViewSetColor(w.w, C.uint8_t(r), C.uint8_t(g), C.uint8_t(b), C.uint8_t(a))
-}
-
-func (w *webview) SetFullscreen(fullscreen bool) {
-	C.CgoWebViewSetFullscreen(w.w, C.int(boolToInt(fullscreen)))
-}
-
-func (w *webview) Dialog(dlgType DialogType, flags int, title string, arg string, filter string) string {
-	const maxPath = 4096
-	titlePtr := C.CString(title)
-	defer C.free(unsafe.Pointer(titlePtr))
-	argPtr := C.CString(arg)
-	defer C.free(unsafe.Pointer(argPtr))
-	resultPtr := (*C.char)(C.calloc((C.size_t)(unsafe.Sizeof((*C.char)(nil))), (C.size_t)(maxPath)))
-	defer C.free(unsafe.Pointer(resultPtr))
-	filterPtr := C.CString(filter)
-	defer C.free(unsafe.Pointer(filterPtr))
-	C.CgoDialog(w.w, C.int(dlgType), C.int(flags), titlePtr,
-		argPtr, resultPtr, C.size_t(maxPath), filterPtr)
-	return C.GoString(resultPtr)
-}
-
-func (w *webview) Eval(js string) error {
-	p := C.CString(js)
-	defer C.free(unsafe.Pointer(p))
-	switch C.CgoWebViewEval(w.w, p) {
-	case -1:
-		return errors.New("evaluation failed")
-	}
-	return nil
-}
-
-func (w *webview) InjectCSS(css string) {
-	p := C.CString(css)
-	defer C.free(unsafe.Pointer(p))
-	C.CgoWebViewInjectCSS(w.w, p)
-}
-
-func (w *webview) Terminate() {
-	C.CgoWebViewTerminate(w.w)
-}
-
-//export _webviewDispatchGoCallback
-func _webviewDispatchGoCallback(index unsafe.Pointer) {
-	var f func()
-	m.Lock()
-	f = fns[uintptr(index)]
-	delete(fns, uintptr(index))
-	m.Unlock()
-	f()
-}
-
-//export _webviewExternalInvokeCallback
-func _webviewExternalInvokeCallback(w unsafe.Pointer, data unsafe.Pointer) {
-	m.Lock()
-	var (
-		cb ExternalInvokeCallbackFunc
-		wv WebView
-	)
-	for wv, cb = range cbs {
-		if wv.(*webview).w == w {
-			break
-		}
-	}
-	m.Unlock()
-	cb(wv, C.GoString((*C.char)(data)))
 }

lib/renderer/webview/webview_darwin.go

@@ -0,0 +1,57 @@
+package webview
+
+/*
+#include "webview_darwin.h"
+*/
+import "C"
+
+import "unsafe"
+
+const (
+	// DialogFlagFile is a normal file picker dialog
+	DialogFlagFile = C.WEBVIEW_DIALOG_FLAG_FILE
+	// DialogFlagDirectory is an open directory dialog
+	DialogFlagDirectory = C.WEBVIEW_DIALOG_FLAG_DIRECTORY
+	// DialogFlagInfo is an info alert dialog
+	DialogFlagInfo = C.WEBVIEW_DIALOG_FLAG_INFO
+	// DialogFlagWarning is a warning alert dialog
+	DialogFlagWarning = C.WEBVIEW_DIALOG_FLAG_WARNING
+	// DialogFlagError is an error dialog
+	DialogFlagError = C.WEBVIEW_DIALOG_FLAG_ERROR
+)
+
+type MacWebView struct {
+	app unsafe.Pointer
+}
+
+func NewWebview(settings Settings) WebView {
+	return &MacWebView{}
+}
+
+func (w *MacWebView) Dialog(dlgType DialogType, flags int, title string, arg string, filter string) string {
+	// TBD
+	return ""
+}
+
+func (w *MacWebView) Dispatch(func()) {
+	// TBD
+}
+
+func (w *MacWebView) Eval(js string) error {
+	// TBD
+	return nil
+}
+
+func (w *MacWebView) Exit() {
+	// TBD
+}
+
+func (w *MacWebView) Run() {}
+func (w *MacWebView) Loop(blocking bool) bool {
+	return true
+}
+func (w *MacWebView) SetTitle(title string)         {}
+func (w *MacWebView) SetFullscreen(fullscreen bool) {}
+func (w *MacWebView) SetColor(r, g, b, a uint8)     {}
+func (w *MacWebView) InjectCSS(css string)          {}
+func (w *MacWebView) Terminate()                    {}

lib/renderer/webview/webview_darwin.h

@@ -0,0 +1,13 @@
+
+#ifndef WEBVIEW_DARWIN
+#define WEBVIEW_DARWIN
+
+#define WEBVIEW_DIALOG_FLAG_FILE (0 << 0)
+#define WEBVIEW_DIALOG_FLAG_DIRECTORY (1 << 0)
+
+#define WEBVIEW_DIALOG_FLAG_INFO (1 << 1)
+#define WEBVIEW_DIALOG_FLAG_WARNING (2 << 1)
+#define WEBVIEW_DIALOG_FLAG_ERROR (3 << 1)
+#define WEBVIEW_DIALOG_FLAG_ALERT_MASK (3 << 1)
+
+#endif

lib/renderer/webview/webview_linux.go

@@ -0,0 +1,386 @@
+// Package webview implements Go bindings to https://github.com/zserge/webview C library.
+// It is a modified version of webview.go from that repository
+// Bindings closely repeat the C APIs and include both, a simplified
+// single-function API to just open a full-screen webview window, and a more
+// advanced and featureful set of APIs, including Go-to-JavaScript bindings.
+//
+// The library uses gtk-webkit, Cocoa/Webkit and MSHTML (IE8..11) as a browser
+// engine and supports Linux, MacOS and Windows 7..10 respectively.
+//
+package webview
+
+/*
+#cgo linux openbsd freebsd CFLAGS: -DWEBVIEW_GTK=1 -Wno-deprecated-declarations
+#cgo linux openbsd freebsd pkg-config: gtk+-3.0 webkit2gtk-4.0
+
+#cgo windows CFLAGS: -DWEBVIEW_WINAPI=1 -std=c99
+#cgo windows LDFLAGS: -lole32 -lcomctl32 -loleaut32 -luuid -lgdi32
+
+#cgo darwin CFLAGS: -DWEBVIEW_COCOA=1 -x objective-c
+#cgo darwin LDFLAGS: -framework Cocoa -framework WebKit
+
+#include <stdlib.h>
+#include <stdint.h>
+#define WEBVIEW_STATIC
+#define WEBVIEW_IMPLEMENTATION
+
+#ifdef WEBVIEW_GTK
+#include "webview_linux.h"
+#endif
+
+#ifdef WEBVIEW_COCOA
+#include "webview_darwin.h"
+#endif
+
+#ifdef WEBVIEW_COCOA
+#include "webview_darwin.h"
+#endif
+
+
+
+extern void _webviewExternalInvokeCallback(void *, void *);
+
+static inline void CgoWebViewFree(void *w) {
+	free((void *)((struct webview *)w)->title);
+	free((void *)((struct webview *)w)->url);
+	free(w);
+}
+
+static inline void *CgoWebViewCreate(int width, int height, char *title, char *url, int resizable, int debug) {
+	struct webview *w = (struct webview *) calloc(1, sizeof(*w));
+	w->width = width;
+	w->height = height;
+	w->title = title;
+	w->url = url;
+	w->resizable = resizable;
+	w->debug = debug;
+	w->external_invoke_cb = (webview_external_invoke_cb_t) _webviewExternalInvokeCallback;
+	if (webview_init(w) != 0) {
+		CgoWebViewFree(w);
+		return NULL;
+	}
+	return (void *)w;
+}
+
+static inline int CgoWebViewLoop(void *w, int blocking) {
+	return webview_loop((struct webview *)w, blocking);
+}
+
+static inline void CgoWebViewTerminate(void *w) {
+	webview_terminate((struct webview *)w);
+}
+
+static inline void CgoWebViewExit(void *w) {
+	webview_exit((struct webview *)w);
+}
+
+static inline void CgoWebViewSetTitle(void *w, char *title) {
+	webview_set_title((struct webview *)w, title);
+}
+
+static inline void CgoWebViewSetFullscreen(void *w, int fullscreen) {
+	webview_set_fullscreen((struct webview *)w, fullscreen);
+}
+
+static inline void CgoWebViewSetColor(void *w, uint8_t r, uint8_t g, uint8_t b, uint8_t a) {
+	webview_set_color((struct webview *)w, r, g, b, a);
+}
+
+static inline void CgoDialog(void *w, int dlgtype, int flags,
+char *title, char *arg, char *res, size_t ressz, char *filter) {
+	webview_dialog(w, dlgtype, flags,
+	(const char*)title, (const char*) arg, res, ressz, filter);
+}
+
+static inline int CgoWebViewEval(void *w, char *js) {
+	return webview_eval((struct webview *)w, js);
+}
+
+static inline void CgoWebViewInjectCSS(void *w, char *css) {
+	webview_inject_css((struct webview *)w, css);
+}
+
+extern void _webviewDispatchGoCallback(void *);
+static inline void _webview_dispatch_cb(struct webview *w, void *arg) {
+	_webviewDispatchGoCallback(arg);
+}
+static inline void CgoWebViewDispatch(void *w, uintptr_t arg) {
+	webview_dispatch((struct webview *)w, _webview_dispatch_cb, (void *)arg);
+}
+*/
+import "C"
+import (
+	"errors"
+	"runtime"
+	"sync"
+	"unsafe"
+)
+
+func init() {
+	// Ensure that main.main is called from the main thread
+	runtime.LockOSThread()
+}
+
+// Open is a simplified API to open a single native window with a full-size webview in
+// it. It can be helpful if you want to communicate with the core app using XHR
+// or WebSockets (as opposed to using JavaScript bindings).
+//
+// Window appearance can be customized using title, width, height and resizable parameters.
+// URL must be provided and can user either a http or https protocol, or be a
+// local file:// URL. On some platforms "data:" URLs are also supported
+// (Linux/MacOS).
+func Open(title, url string, w, h int, resizable bool) error {
+	titleStr := C.CString(title)
+	defer C.free(unsafe.Pointer(titleStr))
+	urlStr := C.CString(url)
+	defer C.free(unsafe.Pointer(urlStr))
+	resize := C.int(0)
+	if resizable {
+		resize = C.int(1)
+	}
+
+	r := C.webview(titleStr, urlStr, C.int(w), C.int(h), resize)
+	if r != 0 {
+		return errors.New("failed to create webview")
+	}
+	return nil
+}
+
+// ExternalInvokeCallbackFunc is a function type that is called every time
+// "window.external.invoke()" is called from JavaScript. Data is the only
+// obligatory string parameter passed into the "invoke(data)" function from
+// JavaScript. To pass more complex data serialized JSON or base64 encoded
+// string can be used.
+type ExternalInvokeCallbackFunc func(w WebView, data string)
+
+// Settings is a set of parameters to customize the initial WebView appearance
+// and behavior. It is passed into the webview.New() constructor.
+type Settings struct {
+	// WebView main window title
+	Title string
+	// URL to open in a webview
+	URL string
+	// Window width in pixels
+	Width int
+	// Window height in pixels
+	Height int
+	// Allows/disallows window resizing
+	Resizable bool
+	// Enable debugging tools (Linux/BSD/MacOS, on Windows use Firebug)
+	Debug bool
+	// A callback that is executed when JavaScript calls "window.external.invoke()"
+	ExternalInvokeCallback ExternalInvokeCallbackFunc
+}
+
+// WebView is an interface that wraps the basic methods for controlling the UI
+// loop, handling multithreading and providing JavaScript bindings.
+type WebView interface {
+	// Run() starts the main UI loop until the user closes the webview window or
+	// Terminate() is called.
+	Run()
+	// Loop() runs a single iteration of the main UI.
+	Loop(blocking bool) bool
+	// SetTitle() changes window title. This method must be called from the main
+	// thread only. See Dispatch() for more details.
+	SetTitle(title string)
+	// SetFullscreen() controls window full-screen mode. This method must be
+	// called from the main thread only. See Dispatch() for more details.
+	SetFullscreen(fullscreen bool)
+	// SetColor() changes window background color. This method must be called from
+	// the main thread only. See Dispatch() for more details.
+	SetColor(r, g, b, a uint8)
+	// Eval() evaluates an arbitrary JS code inside the webview. This method must
+	// be called from the main thread only. See Dispatch() for more details.
+	Eval(js string) error
+	// InjectJS() injects an arbitrary block of CSS code using the JS API. This
+	// method must be called from the main thread only. See Dispatch() for more
+	// details.
+	InjectCSS(css string)
+	// Dialog() opens a system dialog of the given type and title. String
+	// argument can be provided for certain dialogs, such as alert boxes. For
+	// alert boxes argument is a message inside the dialog box.
+	Dialog(dlgType DialogType, flags int, title string, arg string, filter string) string
+	// Terminate() breaks the main UI loop. This method must be called from the main thread
+	// only. See Dispatch() for more details.
+	Terminate()
+	// Dispatch() schedules some arbitrary function to be executed on the main UI
+	// thread. This may be helpful if you want to run some JavaScript from
+	// background threads/goroutines, or to terminate the app.
+	Dispatch(func())
+	// Exit() closes the window and cleans up the resources. Use Terminate() to
+	// forcefully break out of the main UI loop.
+	Exit()
+}
+
+// DialogType is an enumeration of all supported system dialog types
+type DialogType int
+
+const (
+	// DialogTypeOpen is a system file open dialog
+	DialogTypeOpen DialogType = iota
+	// DialogTypeSave is a system file save dialog
+	DialogTypeSave
+	// DialogTypeAlert is a system alert dialog (message box)
+	DialogTypeAlert
+)
+
+const (
+	// DialogFlagFile is a normal file picker dialog
+	DialogFlagFile = C.WEBVIEW_DIALOG_FLAG_FILE
+	// DialogFlagDirectory is an open directory dialog
+	DialogFlagDirectory = C.WEBVIEW_DIALOG_FLAG_DIRECTORY
+	// DialogFlagInfo is an info alert dialog
+	DialogFlagInfo = C.WEBVIEW_DIALOG_FLAG_INFO
+	// DialogFlagWarning is a warning alert dialog
+	DialogFlagWarning = C.WEBVIEW_DIALOG_FLAG_WARNING
+	// DialogFlagError is an error dialog
+	DialogFlagError = C.WEBVIEW_DIALOG_FLAG_ERROR
+)
+
+var (
+	m     sync.Mutex
+	index uintptr
+	fns   = map[uintptr]func(){}
+	cbs   = map[WebView]ExternalInvokeCallbackFunc{}
+)
+
+type webview struct {
+	w unsafe.Pointer
+}
+
+var _ WebView = &webview{}
+
+func boolToInt(b bool) int {
+	if b {
+		return 1
+	}
+	return 0
+}
+
+// NewWebview creates and opens a new webview window using the given settings. The
+// returned object implements the WebView interface. This function returns nil
+// if a window can not be created.
+func NewWebview(settings Settings) WebView {
+	if settings.Width == 0 {
+		settings.Width = 640
+	}
+	if settings.Height == 0 {
+		settings.Height = 480
+	}
+	if settings.Title == "" {
+		settings.Title = "WebView"
+	}
+	w := &webview{}
+	w.w = C.CgoWebViewCreate(C.int(settings.Width), C.int(settings.Height),
+		C.CString(settings.Title), C.CString(settings.URL),
+		C.int(boolToInt(settings.Resizable)), C.int(boolToInt(settings.Debug)))
+	m.Lock()
+	if settings.ExternalInvokeCallback != nil {
+		cbs[w] = settings.ExternalInvokeCallback
+	} else {
+		cbs[w] = func(w WebView, data string) {}
+	}
+	m.Unlock()
+	return w
+}
+
+func (w *webview) Loop(blocking bool) bool {
+	block := C.int(0)
+	if blocking {
+		block = 1
+	}
+	return C.CgoWebViewLoop(w.w, block) == 0
+}
+
+func (w *webview) Run() {
+	for w.Loop(true) {
+	}
+}
+
+func (w *webview) Exit() {
+	C.CgoWebViewExit(w.w)
+}
+
+func (w *webview) Dispatch(f func()) {
+	m.Lock()
+	for ; fns[index] != nil; index++ {
+	}
+	fns[index] = f
+	m.Unlock()
+	C.CgoWebViewDispatch(w.w, C.uintptr_t(index))
+}
+
+func (w *webview) SetTitle(title string) {
+	p := C.CString(title)
+	defer C.free(unsafe.Pointer(p))
+	C.CgoWebViewSetTitle(w.w, p)
+}
+
+func (w *webview) SetColor(r, g, b, a uint8) {
+	C.CgoWebViewSetColor(w.w, C.uint8_t(r), C.uint8_t(g), C.uint8_t(b), C.uint8_t(a))
+}
+
+func (w *webview) SetFullscreen(fullscreen bool) {
+	C.CgoWebViewSetFullscreen(w.w, C.int(boolToInt(fullscreen)))
+}
+
+func (w *webview) Dialog(dlgType DialogType, flags int, title string, arg string, filter string) string {
+	const maxPath = 4096
+	titlePtr := C.CString(title)
+	defer C.free(unsafe.Pointer(titlePtr))
+	argPtr := C.CString(arg)
+	defer C.free(unsafe.Pointer(argPtr))
+	resultPtr := (*C.char)(C.calloc((C.size_t)(unsafe.Sizeof((*C.char)(nil))), (C.size_t)(maxPath)))
+	defer C.free(unsafe.Pointer(resultPtr))
+	filterPtr := C.CString(filter)
+	defer C.free(unsafe.Pointer(filterPtr))
+	C.CgoDialog(w.w, C.int(dlgType), C.int(flags), titlePtr,
+		argPtr, resultPtr, C.size_t(maxPath), filterPtr)
+	return C.GoString(resultPtr)
+}
+
+func (w *webview) Eval(js string) error {
+	p := C.CString(js)
+	defer C.free(unsafe.Pointer(p))
+	switch C.CgoWebViewEval(w.w, p) {
+	case -1:
+		return errors.New("evaluation failed")
+	}
+	return nil
+}
+
+func (w *webview) InjectCSS(css string) {
+	p := C.CString(css)
+	defer C.free(unsafe.Pointer(p))
+	C.CgoWebViewInjectCSS(w.w, p)
+}
+
+func (w *webview) Terminate() {
+	C.CgoWebViewTerminate(w.w)
+}
+
+//export _webviewDispatchGoCallback
+func _webviewDispatchGoCallback(index unsafe.Pointer) {
+	var f func()
+	m.Lock()
+	f = fns[uintptr(index)]
+	delete(fns, uintptr(index))
+	m.Unlock()
+	f()
+}
+
+//export _webviewExternalInvokeCallback
+func _webviewExternalInvokeCallback(w unsafe.Pointer, data unsafe.Pointer) {
+	m.Lock()
+	var (
+		cb ExternalInvokeCallbackFunc
+		wv WebView
+	)
+	for wv, cb = range cbs {
+		if wv.(*webview).w == w {
+			break
+		}
+	}
+	m.Unlock()
+	cb(wv, C.GoString((*C.char)(data)))
+}

lib/renderer/webview/webview_linux.h

@@ -0,0 +1,522 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2017 Serge Zaitsev
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef WEBVIEW_H
+#define WEBVIEW_H
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#ifdef WEBVIEW_STATIC
+#define WEBVIEW_API static
+#else
+#define WEBVIEW_API extern
+#endif
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <JavaScriptCore/JavaScript.h>
+#include <gtk/gtk.h>
+#include <webkit2/webkit2.h>
+
+struct webview_priv
+{
+  GtkWidget *window;
+  GtkWidget *scroller;
+  GtkWidget *webview;
+  GtkWidget *inspector_window;
+  GAsyncQueue *queue;
+  int ready;
+  int js_busy;
+  int should_exit;
+};
+
+struct webview;
+
+typedef void (*webview_external_invoke_cb_t)(struct webview *w,
+                                              const char *arg);
+
+struct webview
+{
+  const char *url;
+  const char *title;
+  int width;
+  int height;
+  int resizable;
+  int transparentTitlebar;
+  int debug;
+  webview_external_invoke_cb_t external_invoke_cb;
+  struct webview_priv priv;
+  void *userdata;
+};
+
+enum webview_dialog_type
+{
+  WEBVIEW_DIALOG_TYPE_OPEN = 0,
+  WEBVIEW_DIALOG_TYPE_SAVE = 1,
+  WEBVIEW_DIALOG_TYPE_ALERT = 2
+};
+
+#define WEBVIEW_DIALOG_FLAG_FILE (0 << 0)
+#define WEBVIEW_DIALOG_FLAG_DIRECTORY (1 << 0)
+
+#define WEBVIEW_DIALOG_FLAG_INFO (1 << 1)
+#define WEBVIEW_DIALOG_FLAG_WARNING (2 << 1)
+#define WEBVIEW_DIALOG_FLAG_ERROR (3 << 1)
+#define WEBVIEW_DIALOG_FLAG_ALERT_MASK (3 << 1)
+
+typedef void (*webview_dispatch_fn)(struct webview *w, void *arg);
+
+struct webview_dispatch_arg
+{
+  webview_dispatch_fn fn;
+  struct webview *w;
+  void *arg;
+};
+
+#define DEFAULT_URL                                                            \
+"data:text/"                                                                 \
+"html,%3C%21DOCTYPE%20html%3E%0A%3Chtml%20lang=%22en%22%3E%0A%3Chead%3E%"    \
+"3Cmeta%20charset=%22utf-8%22%3E%3Cmeta%20http-equiv=%22IE=edge%22%"         \
+"20content=%22IE=edge%22%3E%3C%2Fhead%3E%0A%3Cbody%3E%3Cdiv%20id=%22app%22%" \
+"3E%3C%2Fdiv%3E%3Cscript%20type=%22text%2Fjavascript%22%3E%3C%2Fscript%3E%"  \
+"3C%2Fbody%3E%0A%3C%2Fhtml%3E"
+
+#define CSS_INJECT_FUNCTION                                           \
+"(function(e){var "                                                 \
+"t=document.createElement('style'),d=document.head||document."      \
+"getElementsByTagName('head')[0];t.setAttribute('type','text/"      \
+"css'),t.styleSheet?t.styleSheet.cssText=e:t.appendChild(document." \
+"createTextNode(e)),d.appendChild(t)})"
+
+static const char *webview_check_url(const char *url)
+{
+  if (url == NULL || strlen(url) == 0)
+  {
+    return DEFAULT_URL;
+  }
+  return url;
+}
+
+WEBVIEW_API int webview(const char *title, const char *url, int width,
+                        int height, int resizable);
+
+WEBVIEW_API int webview_init(struct webview *w);
+WEBVIEW_API int webview_loop(struct webview *w, int blocking);
+WEBVIEW_API int webview_eval(struct webview *w, const char *js);
+WEBVIEW_API int webview_inject_css(struct webview *w, const char *css);
+WEBVIEW_API void webview_set_title(struct webview *w, const char *title);
+WEBVIEW_API void webview_set_fullscreen(struct webview *w, int fullscreen);
+WEBVIEW_API void webview_set_color(struct webview *w, uint8_t r, uint8_t g,
+                                    uint8_t b, uint8_t a);
+WEBVIEW_API void webview_dialog(struct webview *w,
+                                enum webview_dialog_type dlgtype, int flags,
+                                const char *title, const char *arg,
+                                char *result, size_t resultsz, char *filter);
+WEBVIEW_API void webview_dispatch(struct webview *w, webview_dispatch_fn fn,
+                                  void *arg);
+WEBVIEW_API void webview_terminate(struct webview *w);
+WEBVIEW_API void webview_exit(struct webview *w);
+WEBVIEW_API void webview_debug(const char *format, ...);
+WEBVIEW_API void webview_print_log(const char *s);
+
+WEBVIEW_API int webview(const char *title, const char *url, int width,
+                        int height, int resizable)
+{
+  struct webview webview;
+  memset(&webview, 0, sizeof(webview));
+  webview.title = title;
+  webview.url = url;
+  webview.width = width;
+  webview.height = height;
+  webview.resizable = resizable;
+  int r = webview_init(&webview);
+  if (r != 0)
+  {
+    return r;
+  }
+  while (webview_loop(&webview, 1) == 0)
+  {
+  }
+  webview_exit(&webview);
+  return 0;
+}
+
+WEBVIEW_API void webview_debug(const char *format, ...)
+{
+  char buf[4096];
+  va_list ap;
+  va_start(ap, format);
+  vsnprintf(buf, sizeof(buf), format, ap);
+  webview_print_log(buf);
+  va_end(ap);
+}
+
+static int webview_js_encode(const char *s, char *esc, size_t n)
+{
+  int r = 1; /* At least one byte for trailing zero */
+  for (; *s; s++)
+  {
+    const unsigned char c = *s;
+    if (c >= 0x20 && c < 0x80 && strchr("<>\\'\"", c) == NULL)
+    {
+      if (n > 0)
+      {
+        *esc++ = c;
+        n--;
+      }
+      r++;
+    }
+    else
+    {
+      if (n > 0)
+      {
+        snprintf(esc, n, "\\x%02x", (int)c);
+        esc += 4;
+        n -= 4;
+      }
+      r += 4;
+    }
+  }
+  return r;
+}
+
+WEBVIEW_API int webview_inject_css(struct webview *w, const char *css)
+{
+  int n = webview_js_encode(css, NULL, 0);
+  char *esc = (char *)calloc(1, sizeof(CSS_INJECT_FUNCTION) + n + 4);
+  if (esc == NULL)
+  {
+    return -1;
+  }
+  char *js = (char *)calloc(1, n);
+  webview_js_encode(css, js, n);
+  snprintf(esc, sizeof(CSS_INJECT_FUNCTION) + n + 4, "%s(\"%s\")",
+            CSS_INJECT_FUNCTION, js);
+  int r = webview_eval(w, esc);
+  free(js);
+  free(esc);
+  return r;
+}
+
+static void external_message_received_cb(WebKitUserContentManager *m,
+                                          WebKitJavascriptResult *r,
+                                          gpointer arg)
+{
+  (void)m;
+  struct webview *w = (struct webview *)arg;
+  if (w->external_invoke_cb == NULL)
+  {
+    return;
+  }
+  JSGlobalContextRef context = webkit_javascript_result_get_global_context(r);
+  JSValueRef value = webkit_javascript_result_get_value(r);
+  JSStringRef js = JSValueToStringCopy(context, value, NULL);
+  size_t n = JSStringGetMaximumUTF8CStringSize(js);
+  char *s = g_new(char, n);
+  JSStringGetUTF8CString(js, s, n);
+  w->external_invoke_cb(w, s);
+  JSStringRelease(js);
+  g_free(s);
+}
+
+static void webview_load_changed_cb(WebKitWebView *webview,
+                                    WebKitLoadEvent event, gpointer arg)
+{
+  (void)webview;
+  struct webview *w = (struct webview *)arg;
+  if (event == WEBKIT_LOAD_FINISHED)
+  {
+    w->priv.ready = 1;
+  }
+}
+
+static void webview_destroy_cb(GtkWidget *widget, gpointer arg)
+{
+  (void)widget;
+  struct webview *w = (struct webview *)arg;
+  webview_terminate(w);
+}
+
+static gboolean webview_context_menu_cb(WebKitWebView *webview,
+                                        GtkWidget *default_menu,
+                                        WebKitHitTestResult *hit_test_result,
+                                        gboolean triggered_with_keyboard,
+                                        gpointer userdata)
+{
+  (void)webview;
+  (void)default_menu;
+  (void)hit_test_result;
+  (void)triggered_with_keyboard;
+  (void)userdata;
+  return TRUE;
+}
+
+WEBVIEW_API int webview_init(struct webview *w)
+{
+  if (gtk_init_check(0, NULL) == FALSE)
+  {
+    return -1;
+  }
+
+  w->priv.ready = 0;
+  w->priv.should_exit = 0;
+  w->priv.queue = g_async_queue_new();
+  w->priv.window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
+  gtk_window_set_title(GTK_WINDOW(w->priv.window), w->title);
+
+  if (w->resizable)
+  {
+    gtk_window_set_default_size(GTK_WINDOW(w->priv.window), w->width,
+                                w->height);
+  }
+  else
+  {
+    gtk_widget_set_size_request(w->priv.window, w->width, w->height);
+  }
+  gtk_window_set_resizable(GTK_WINDOW(w->priv.window), !!w->resizable);
+  gtk_window_set_position(GTK_WINDOW(w->priv.window), GTK_WIN_POS_CENTER);
+
+  w->priv.scroller = gtk_scrolled_window_new(NULL, NULL);
+  gtk_container_add(GTK_CONTAINER(w->priv.window), w->priv.scroller);
+
+  WebKitUserContentManager *m = webkit_user_content_manager_new();
+  webkit_user_content_manager_register_script_message_handler(m, "external");
+  g_signal_connect(m, "script-message-received::external",
+                    G_CALLBACK(external_message_received_cb), w);
+
+  w->priv.webview = webkit_web_view_new_with_user_content_manager(m);
+  webkit_web_view_load_uri(WEBKIT_WEB_VIEW(w->priv.webview),
+                            webview_check_url(w->url));
+  g_signal_connect(G_OBJECT(w->priv.webview), "load-changed",
+                    G_CALLBACK(webview_load_changed_cb), w);
+  gtk_container_add(GTK_CONTAINER(w->priv.scroller), w->priv.webview);
+
+  if (w->debug)
+  {
+    WebKitSettings *settings =
+        webkit_web_view_get_settings(WEBKIT_WEB_VIEW(w->priv.webview));
+    webkit_settings_set_enable_write_console_messages_to_stdout(settings, true);
+    webkit_settings_set_enable_developer_extras(settings, true);
+  }
+  else
+  {
+    g_signal_connect(G_OBJECT(w->priv.webview), "context-menu",
+                      G_CALLBACK(webview_context_menu_cb), w);
+  }
+
+  gtk_widget_show_all(w->priv.window);
+
+  webkit_web_view_run_javascript(
+      WEBKIT_WEB_VIEW(w->priv.webview),
+      "window.external={invoke:function(x){"
+      "window.webkit.messageHandlers.external.postMessage(x);}}",
+      NULL, NULL, NULL);
+
+  g_signal_connect(G_OBJECT(w->priv.window), "destroy",
+                    G_CALLBACK(webview_destroy_cb), w);
+  return 0;
+}
+
+WEBVIEW_API int webview_loop(struct webview *w, int blocking)
+{
+  gtk_main_iteration_do(blocking);
+  return w->priv.should_exit;
+}
+
+WEBVIEW_API void webview_set_title(struct webview *w, const char *title)
+{
+  gtk_window_set_title(GTK_WINDOW(w->priv.window), title);
+}
+
+WEBVIEW_API void webview_set_fullscreen(struct webview *w, int fullscreen)
+{
+  if (fullscreen)
+  {
+    gtk_window_fullscreen(GTK_WINDOW(w->priv.window));
+  }
+  else
+  {
+    gtk_window_unfullscreen(GTK_WINDOW(w->priv.window));
+  }
+}
+
+WEBVIEW_API void webview_set_color(struct webview *w, uint8_t r, uint8_t g,
+                                    uint8_t b, uint8_t a)
+{
+  GdkRGBA color = {r / 255.0, g / 255.0, b / 255.0, a / 255.0};
+  webkit_web_view_set_background_color(WEBKIT_WEB_VIEW(w->priv.webview),
+                                        &color);
+}
+
+WEBVIEW_API void webview_dialog(struct webview *w,
+                                enum webview_dialog_type dlgtype, int flags,
+                                const char *title, const char *arg,
+                                char *result, size_t resultsz, char *filter)
+{
+  GtkWidget *dlg;
+  if (result != NULL)
+  {
+    result[0] = '\0';
+  }
+  if (dlgtype == WEBVIEW_DIALOG_TYPE_OPEN ||
+      dlgtype == WEBVIEW_DIALOG_TYPE_SAVE)
+  {
+    dlg = gtk_file_chooser_dialog_new(
+        title, GTK_WINDOW(w->priv.window),
+        (dlgtype == WEBVIEW_DIALOG_TYPE_OPEN
+              ? (flags & WEBVIEW_DIALOG_FLAG_DIRECTORY
+                    ? GTK_FILE_CHOOSER_ACTION_SELECT_FOLDER
+                    : GTK_FILE_CHOOSER_ACTION_OPEN)
+              : GTK_FILE_CHOOSER_ACTION_SAVE),
+        "_Cancel", GTK_RESPONSE_CANCEL,
+        (dlgtype == WEBVIEW_DIALOG_TYPE_OPEN ? "_Open" : "_Save"),
+        GTK_RESPONSE_ACCEPT, NULL);
+    if (filter[0] != '\0') {
+        GtkFileFilter *file_filter = gtk_file_filter_new();
+        gchar **filters  = g_strsplit(filter, ",", -1);
+        gint i;
+        for(i = 0; filters && filters[i]; i++) {
+            gtk_file_filter_add_pattern(file_filter, filters[i]);
+        }
+        gtk_file_filter_set_name(file_filter, filter);
+        gtk_file_chooser_add_filter(GTK_FILE_CHOOSER(dlg), file_filter);
+        g_strfreev(filters);
+    }
+    gtk_file_chooser_set_local_only(GTK_FILE_CHOOSER(dlg), FALSE);
+    gtk_file_chooser_set_select_multiple(GTK_FILE_CHOOSER(dlg), FALSE);
+    gtk_file_chooser_set_show_hidden(GTK_FILE_CHOOSER(dlg), TRUE);
+    gtk_file_chooser_set_do_overwrite_confirmation(GTK_FILE_CHOOSER(dlg), TRUE);
+    gtk_file_chooser_set_create_folders(GTK_FILE_CHOOSER(dlg), TRUE);
+    gint response = gtk_dialog_run(GTK_DIALOG(dlg));
+    if (response == GTK_RESPONSE_ACCEPT)
+    {
+      gchar *filename = gtk_file_chooser_get_filename(GTK_FILE_CHOOSER(dlg));
+      g_strlcpy(result, filename, resultsz);
+      g_free(filename);
+    }
+    gtk_widget_destroy(dlg);
+  }
+  else if (dlgtype == WEBVIEW_DIALOG_TYPE_ALERT)
+  {
+    GtkMessageType type = GTK_MESSAGE_OTHER;
+    switch (flags & WEBVIEW_DIALOG_FLAG_ALERT_MASK)
+    {
+    case WEBVIEW_DIALOG_FLAG_INFO:
+      type = GTK_MESSAGE_INFO;
+      break;
+    case WEBVIEW_DIALOG_FLAG_WARNING:
+      type = GTK_MESSAGE_WARNING;
+      break;
+    case WEBVIEW_DIALOG_FLAG_ERROR:
+      type = GTK_MESSAGE_ERROR;
+      break;
+    }
+    dlg = gtk_message_dialog_new(GTK_WINDOW(w->priv.window), GTK_DIALOG_MODAL,
+                                  type, GTK_BUTTONS_OK, "%s", title);
+    gtk_message_dialog_format_secondary_text(GTK_MESSAGE_DIALOG(dlg), "%s",
+                                              arg);
+    gtk_dialog_run(GTK_DIALOG(dlg));
+    gtk_widget_destroy(dlg);
+  }
+}
+
+static void webview_eval_finished(GObject *object, GAsyncResult *result,
+                                  gpointer userdata)
+{
+  (void)object;
+  (void)result;
+  struct webview *w = (struct webview *)userdata;
+  w->priv.js_busy = 0;
+}
+
+WEBVIEW_API int webview_eval(struct webview *w, const char *js)
+{
+  while (w->priv.ready == 0)
+  {
+    g_main_context_iteration(NULL, TRUE);
+  }
+  w->priv.js_busy = 1;
+  webkit_web_view_run_javascript(WEBKIT_WEB_VIEW(w->priv.webview), js, NULL,
+                                  webview_eval_finished, w);
+  while (w->priv.js_busy)
+  {
+    g_main_context_iteration(NULL, TRUE);
+  }
+  return 0;
+}
+
+static gboolean webview_dispatch_wrapper(gpointer userdata)
+{
+  struct webview *w = (struct webview *)userdata;
+  for (;;)
+  {
+    struct webview_dispatch_arg *arg =
+        (struct webview_dispatch_arg *)g_async_queue_try_pop(w->priv.queue);
+    if (arg == NULL)
+    {
+      break;
+    }
+    (arg->fn)(w, arg->arg);
+    g_free(arg);
+  }
+  return FALSE;
+}
+
+WEBVIEW_API void webview_dispatch(struct webview *w, webview_dispatch_fn fn,
+                                  void *arg)
+{
+  struct webview_dispatch_arg *context =
+      (struct webview_dispatch_arg *)g_new(struct webview_dispatch_arg *, 1);
+  context->w = w;
+  context->arg = arg;
+  context->fn = fn;
+  g_async_queue_lock(w->priv.queue);
+  g_async_queue_push_unlocked(w->priv.queue, context);
+  if (g_async_queue_length_unlocked(w->priv.queue) == 1)
+  {
+    gdk_threads_add_idle(webview_dispatch_wrapper, w);
+  }
+  g_async_queue_unlock(w->priv.queue);
+}
+
+WEBVIEW_API void webview_terminate(struct webview *w)
+{
+  w->priv.should_exit = 1;
+}
+
+WEBVIEW_API void webview_exit(struct webview *w) { (void)w; }
+WEBVIEW_API void webview_print_log(const char *s)
+{
+  fprintf(stderr, "%s\n", s);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* WEBVIEW_H */

lib/renderer/webview/webview_windows.go

@@ -0,0 +1,368 @@
+// Package webview implements Go bindings to https://github.com/zserge/webview C library.
+// It is a modified version of webview.go from that repository
+// Bindings closely repeat the C APIs and include both, a simplified
+// single-function API to just open a full-screen webview window, and a more
+// advanced and featureful set of APIs, including Go-to-JavaScript bindings.
+//
+// The library uses gtk-webkit, Cocoa/Webkit and MSHTML (IE8..11) as a browser
+// engine and supports Linux, MacOS and Windows 7..10 respectively.
+//
+package webview
+
+/*
+#cgo windows CFLAGS: -DWEBVIEW_WINAPI=1 -std=c99
+#cgo windows LDFLAGS: -lole32 -lcomctl32 -loleaut32 -luuid -lgdi32
+
+#include <stdlib.h>
+#include <stdint.h>
+#define WEBVIEW_STATIC
+#define WEBVIEW_IMPLEMENTATION
+
+#include "webview_windows.h"
+
+extern void _webviewExternalInvokeCallback(void *, void *);
+
+static inline void CgoWebViewFree(void *w) {
+	free((void *)((struct webview *)w)->title);
+	free((void *)((struct webview *)w)->url);
+	free(w);
+}
+
+static inline void *CgoWebViewCreate(int width, int height, char *title, char *url, int resizable, int debug) {
+	struct webview *w = (struct webview *) calloc(1, sizeof(*w));
+	w->width = width;
+	w->height = height;
+	w->title = title;
+	w->url = url;
+	w->resizable = resizable;
+	w->debug = debug;
+	w->external_invoke_cb = (webview_external_invoke_cb_t) _webviewExternalInvokeCallback;
+	if (webview_init(w) != 0) {
+		CgoWebViewFree(w);
+		return NULL;
+	}
+	return (void *)w;
+}
+
+static inline int CgoWebViewLoop(void *w, int blocking) {
+	return webview_loop((struct webview *)w, blocking);
+}
+
+static inline void CgoWebViewTerminate(void *w) {
+	webview_terminate((struct webview *)w);
+}
+
+static inline void CgoWebViewExit(void *w) {
+	webview_exit((struct webview *)w);
+}
+
+static inline void CgoWebViewSetTitle(void *w, char *title) {
+	webview_set_title((struct webview *)w, title);
+}
+
+static inline void CgoWebViewSetFullscreen(void *w, int fullscreen) {
+	webview_set_fullscreen((struct webview *)w, fullscreen);
+}
+
+static inline void CgoWebViewSetColor(void *w, uint8_t r, uint8_t g, uint8_t b, uint8_t a) {
+	webview_set_color((struct webview *)w, r, g, b, a);
+}
+
+static inline void CgoDialog(void *w, int dlgtype, int flags,
+char *title, char *arg, char *res, size_t ressz, char *filter) {
+	webview_dialog(w, dlgtype, flags,
+	(const char*)title, (const char*) arg, res, ressz, filter);
+}
+
+static inline int CgoWebViewEval(void *w, char *js) {
+	return webview_eval((struct webview *)w, js);
+}
+
+static inline void CgoWebViewInjectCSS(void *w, char *css) {
+	webview_inject_css((struct webview *)w, css);
+}
+
+extern void _webviewDispatchGoCallback(void *);
+static inline void _webview_dispatch_cb(struct webview *w, void *arg) {
+	_webviewDispatchGoCallback(arg);
+}
+static inline void CgoWebViewDispatch(void *w, uintptr_t arg) {
+	webview_dispatch((struct webview *)w, _webview_dispatch_cb, (void *)arg);
+}
+*/
+import "C"
+import (
+	"errors"
+	"runtime"
+	"sync"
+	"unsafe"
+)
+
+func init() {
+	// Ensure that main.main is called from the main thread
+	runtime.LockOSThread()
+}
+
+// Open is a simplified API to open a single native window with a full-size webview in
+// it. It can be helpful if you want to communicate with the core app using XHR
+// or WebSockets (as opposed to using JavaScript bindings).
+//
+// Window appearance can be customized using title, width, height and resizable parameters.
+// URL must be provided and can user either a http or https protocol, or be a
+// local file:// URL. On some platforms "data:" URLs are also supported
+// (Linux/MacOS).
+func Open(title, url string, w, h int, resizable bool) error {
+	titleStr := C.CString(title)
+	defer C.free(unsafe.Pointer(titleStr))
+	urlStr := C.CString(url)
+	defer C.free(unsafe.Pointer(urlStr))
+	resize := C.int(0)
+	if resizable {
+		resize = C.int(1)
+	}
+
+	r := C.webview(titleStr, urlStr, C.int(w), C.int(h), resize)
+	if r != 0 {
+		return errors.New("failed to create webview")
+	}
+	return nil
+}
+
+// ExternalInvokeCallbackFunc is a function type that is called every time
+// "window.external.invoke()" is called from JavaScript. Data is the only
+// obligatory string parameter passed into the "invoke(data)" function from
+// JavaScript. To pass more complex data serialized JSON or base64 encoded
+// string can be used.
+type ExternalInvokeCallbackFunc func(w WebView, data string)
+
+// Settings is a set of parameters to customize the initial WebView appearance
+// and behavior. It is passed into the webview.New() constructor.
+type Settings struct {
+	// WebView main window title
+	Title string
+	// URL to open in a webview
+	URL string
+	// Window width in pixels
+	Width int
+	// Window height in pixels
+	Height int
+	// Allows/disallows window resizing
+	Resizable bool
+	// Enable debugging tools (Linux/BSD/MacOS, on Windows use Firebug)
+	Debug bool
+	// A callback that is executed when JavaScript calls "window.external.invoke()"
+	ExternalInvokeCallback ExternalInvokeCallbackFunc
+}
+
+// WebView is an interface that wraps the basic methods for controlling the UI
+// loop, handling multithreading and providing JavaScript bindings.
+type WebView interface {
+	// Run() starts the main UI loop until the user closes the webview window or
+	// Terminate() is called.
+	Run()
+	// Loop() runs a single iteration of the main UI.
+	Loop(blocking bool) bool
+	// SetTitle() changes window title. This method must be called from the main
+	// thread only. See Dispatch() for more details.
+	SetTitle(title string)
+	// SetFullscreen() controls window full-screen mode. This method must be
+	// called from the main thread only. See Dispatch() for more details.
+	SetFullscreen(fullscreen bool)
+	// SetColor() changes window background color. This method must be called from
+	// the main thread only. See Dispatch() for more details.
+	SetColor(r, g, b, a uint8)
+	// Eval() evaluates an arbitrary JS code inside the webview. This method must
+	// be called from the main thread only. See Dispatch() for more details.
+	Eval(js string) error
+	// InjectJS() injects an arbitrary block of CSS code using the JS API. This
+	// method must be called from the main thread only. See Dispatch() for more
+	// details.
+	InjectCSS(css string)
+	// Dialog() opens a system dialog of the given type and title. String
+	// argument can be provided for certain dialogs, such as alert boxes. For
+	// alert boxes argument is a message inside the dialog box.
+	Dialog(dlgType DialogType, flags int, title string, arg string, filter string) string
+	// Terminate() breaks the main UI loop. This method must be called from the main thread
+	// only. See Dispatch() for more details.
+	Terminate()
+	// Dispatch() schedules some arbitrary function to be executed on the main UI
+	// thread. This may be helpful if you want to run some JavaScript from
+	// background threads/goroutines, or to terminate the app.
+	Dispatch(func())
+	// Exit() closes the window and cleans up the resources. Use Terminate() to
+	// forcefully break out of the main UI loop.
+	Exit()
+}
+
+// DialogType is an enumeration of all supported system dialog types
+type DialogType int
+
+const (
+	// DialogTypeOpen is a system file open dialog
+	DialogTypeOpen DialogType = iota
+	// DialogTypeSave is a system file save dialog
+	DialogTypeSave
+	// DialogTypeAlert is a system alert dialog (message box)
+	DialogTypeAlert
+)
+
+const (
+	// DialogFlagFile is a normal file picker dialog
+	DialogFlagFile = C.WEBVIEW_DIALOG_FLAG_FILE
+	// DialogFlagDirectory is an open directory dialog
+	DialogFlagDirectory = C.WEBVIEW_DIALOG_FLAG_DIRECTORY
+	// DialogFlagInfo is an info alert dialog
+	DialogFlagInfo = C.WEBVIEW_DIALOG_FLAG_INFO
+	// DialogFlagWarning is a warning alert dialog
+	DialogFlagWarning = C.WEBVIEW_DIALOG_FLAG_WARNING
+	// DialogFlagError is an error dialog
+	DialogFlagError = C.WEBVIEW_DIALOG_FLAG_ERROR
+)
+
+var (
+	m     sync.Mutex
+	index uintptr
+	fns   = map[uintptr]func(){}
+	cbs   = map[WebView]ExternalInvokeCallbackFunc{}
+)
+
+type webview struct {
+	w unsafe.Pointer
+}
+
+var _ WebView = &webview{}
+
+func boolToInt(b bool) int {
+	if b {
+		return 1
+	}
+	return 0
+}
+
+// NewWebview creates and opens a new webview window using the given settings. The
+// returned object implements the WebView interface. This function returns nil
+// if a window can not be created.
+func NewWebview(settings Settings) WebView {
+	if settings.Width == 0 {
+		settings.Width = 640
+	}
+	if settings.Height == 0 {
+		settings.Height = 480
+	}
+	if settings.Title == "" {
+		settings.Title = "WebView"
+	}
+	w := &webview{}
+	w.w = C.CgoWebViewCreate(C.int(settings.Width), C.int(settings.Height),
+		C.CString(settings.Title), C.CString(settings.URL),
+		C.int(boolToInt(settings.Resizable)), C.int(boolToInt(settings.Debug)))
+	m.Lock()
+	if settings.ExternalInvokeCallback != nil {
+		cbs[w] = settings.ExternalInvokeCallback
+	} else {
+		cbs[w] = func(w WebView, data string) {}
+	}
+	m.Unlock()
+	return w
+}
+
+func (w *webview) Loop(blocking bool) bool {
+	block := C.int(0)
+	if blocking {
+		block = 1
+	}
+	return C.CgoWebViewLoop(w.w, block) == 0
+}
+
+func (w *webview) Run() {
+	for w.Loop(true) {
+	}
+}
+
+func (w *webview) Exit() {
+	C.CgoWebViewExit(w.w)
+}
+
+func (w *webview) Dispatch(f func()) {
+	m.Lock()
+	for ; fns[index] != nil; index++ {
+	}
+	fns[index] = f
+	m.Unlock()
+	C.CgoWebViewDispatch(w.w, C.uintptr_t(index))
+}
+
+func (w *webview) SetTitle(title string) {
+	p := C.CString(title)
+	defer C.free(unsafe.Pointer(p))
+	C.CgoWebViewSetTitle(w.w, p)
+}
+
+func (w *webview) SetColor(r, g, b, a uint8) {
+	C.CgoWebViewSetColor(w.w, C.uint8_t(r), C.uint8_t(g), C.uint8_t(b), C.uint8_t(a))
+}
+
+func (w *webview) SetFullscreen(fullscreen bool) {
+	C.CgoWebViewSetFullscreen(w.w, C.int(boolToInt(fullscreen)))
+}
+
+func (w *webview) Dialog(dlgType DialogType, flags int, title string, arg string, filter string) string {
+	const maxPath = 4096
+	titlePtr := C.CString(title)
+	defer C.free(unsafe.Pointer(titlePtr))
+	argPtr := C.CString(arg)
+	defer C.free(unsafe.Pointer(argPtr))
+	resultPtr := (*C.char)(C.calloc((C.size_t)(unsafe.Sizeof((*C.char)(nil))), (C.size_t)(maxPath)))
+	defer C.free(unsafe.Pointer(resultPtr))
+	filterPtr := C.CString(filter)
+	defer C.free(unsafe.Pointer(filterPtr))
+	C.CgoDialog(w.w, C.int(dlgType), C.int(flags), titlePtr,
+		argPtr, resultPtr, C.size_t(maxPath), filterPtr)
+	return C.GoString(resultPtr)
+}
+
+func (w *webview) Eval(js string) error {
+	p := C.CString(js)
+	defer C.free(unsafe.Pointer(p))
+	switch C.CgoWebViewEval(w.w, p) {
+	case -1:
+		return errors.New("evaluation failed")
+	}
+	return nil
+}
+
+func (w *webview) InjectCSS(css string) {
+	p := C.CString(css)
+	defer C.free(unsafe.Pointer(p))
+	C.CgoWebViewInjectCSS(w.w, p)
+}
+
+func (w *webview) Terminate() {
+	C.CgoWebViewTerminate(w.w)
+}
+
+//export _webviewDispatchGoCallback
+func _webviewDispatchGoCallback(index unsafe.Pointer) {
+	var f func()
+	m.Lock()
+	f = fns[uintptr(index)]
+	delete(fns, uintptr(index))
+	m.Unlock()
+	f()
+}
+
+//export _webviewExternalInvokeCallback
+func _webviewExternalInvokeCallback(w unsafe.Pointer, data unsafe.Pointer) {
+	m.Lock()
+	var (
+		cb ExternalInvokeCallbackFunc
+		wv WebView
+	)
+	for wv, cb = range cbs {
+		if wv.(*webview).w == w {
+			break
+		}
+	}
+	m.Unlock()
+	cb(wv, C.GoString((*C.char)(data)))
+}

lib/renderer/webview/webview_windows.h

@@ -39,23 +39,6 @@ extern "C"
 #include <stdlib.h>
 #include <string.h>
 
-#if defined(WEBVIEW_GTK)
-#include <JavaScriptCore/JavaScript.h>
-#include <gtk/gtk.h>
-#include <webkit2/webkit2.h>
-
-  struct webview_priv
-  {
-    GtkWidget *window;
-    GtkWidget *scroller;
-    GtkWidget *webview;
-    GtkWidget *inspector_window;
-    GAsyncQueue *queue;
-    int ready;
-    int js_busy;
-    int should_exit;
-  };
-#elif defined(WEBVIEW_WINAPI)
 #define CINTERFACE
 #include <windows.h>
 
@@ -76,22 +59,6 @@ struct webview_priv
   DWORD saved_ex_style;
   RECT saved_rect;
 };
-#elif defined(WEBVIEW_COCOA)
-#import <Cocoa/Cocoa.h>
-#import <WebKit/WebKit.h>
-#import <objc/runtime.h>
-
-struct webview_priv
-{
-  NSAutoreleasePool *pool;
-  NSWindow *window;
-  WebView *webview;
-  id delegate;
-  int should_exit;
-};
-#else
-#error "Define one of: WEBVIEW_GTK, WEBVIEW_COCOA or WEBVIEW_WINAPI"
-#endif
 
   struct webview;
 
@@ -182,9 +149,6 @@ struct webview_priv
   WEBVIEW_API void webview_debug(const char *format, ...);
   WEBVIEW_API void webview_print_log(const char *s);
 
-#ifdef WEBVIEW_IMPLEMENTATION
-#undef WEBVIEW_IMPLEMENTATION
-
   WEBVIEW_API int webview(const char *title, const char *url, int width,
                           int height, int resizable)
   {
@@ -264,301 +228,6 @@ struct webview_priv
     return r;
   }
 
-#if defined(WEBVIEW_GTK)
-  static void external_message_received_cb(WebKitUserContentManager *m,
-                                           WebKitJavascriptResult *r,
-                                           gpointer arg)
-  {
-    (void)m;
-    struct webview *w = (struct webview *)arg;
-    if (w->external_invoke_cb == NULL)
-    {
-      return;
-    }
-    JSGlobalContextRef context = webkit_javascript_result_get_global_context(r);
-    JSValueRef value = webkit_javascript_result_get_value(r);
-    JSStringRef js = JSValueToStringCopy(context, value, NULL);
-    size_t n = JSStringGetMaximumUTF8CStringSize(js);
-    char *s = g_new(char, n);
-    JSStringGetUTF8CString(js, s, n);
-    w->external_invoke_cb(w, s);
-    JSStringRelease(js);
-    g_free(s);
-  }
-
-  static void webview_load_changed_cb(WebKitWebView *webview,
-                                      WebKitLoadEvent event, gpointer arg)
-  {
-    (void)webview;
-    struct webview *w = (struct webview *)arg;
-    if (event == WEBKIT_LOAD_FINISHED)
-    {
-      w->priv.ready = 1;
-    }
-  }
-
-  static void webview_destroy_cb(GtkWidget *widget, gpointer arg)
-  {
-    (void)widget;
-    struct webview *w = (struct webview *)arg;
-    webview_terminate(w);
-  }
-
-  static gboolean webview_context_menu_cb(WebKitWebView *webview,
-                                          GtkWidget *default_menu,
-                                          WebKitHitTestResult *hit_test_result,
-                                          gboolean triggered_with_keyboard,
-                                          gpointer userdata)
-  {
-    (void)webview;
-    (void)default_menu;
-    (void)hit_test_result;
-    (void)triggered_with_keyboard;
-    (void)userdata;
-    return TRUE;
-  }
-
-  WEBVIEW_API int webview_init(struct webview *w)
-  {
-    if (gtk_init_check(0, NULL) == FALSE)
-    {
-      return -1;
-    }
-
-    w->priv.ready = 0;
-    w->priv.should_exit = 0;
-    w->priv.queue = g_async_queue_new();
-    w->priv.window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
-    gtk_window_set_title(GTK_WINDOW(w->priv.window), w->title);
-
-    if (w->resizable)
-    {
-      gtk_window_set_default_size(GTK_WINDOW(w->priv.window), w->width,
-                                  w->height);
-    }
-    else
-    {
-      gtk_widget_set_size_request(w->priv.window, w->width, w->height);
-    }
-    gtk_window_set_resizable(GTK_WINDOW(w->priv.window), !!w->resizable);
-    gtk_window_set_position(GTK_WINDOW(w->priv.window), GTK_WIN_POS_CENTER);
-
-    w->priv.scroller = gtk_scrolled_window_new(NULL, NULL);
-    gtk_container_add(GTK_CONTAINER(w->priv.window), w->priv.scroller);
-
-    WebKitUserContentManager *m = webkit_user_content_manager_new();
-    webkit_user_content_manager_register_script_message_handler(m, "external");
-    g_signal_connect(m, "script-message-received::external",
-                     G_CALLBACK(external_message_received_cb), w);
-
-    w->priv.webview = webkit_web_view_new_with_user_content_manager(m);
-    webkit_web_view_load_uri(WEBKIT_WEB_VIEW(w->priv.webview),
-                             webview_check_url(w->url));
-    g_signal_connect(G_OBJECT(w->priv.webview), "load-changed",
-                     G_CALLBACK(webview_load_changed_cb), w);
-    gtk_container_add(GTK_CONTAINER(w->priv.scroller), w->priv.webview);
-
-    if (w->debug)
-    {
-      WebKitSettings *settings =
-          webkit_web_view_get_settings(WEBKIT_WEB_VIEW(w->priv.webview));
-      webkit_settings_set_enable_write_console_messages_to_stdout(settings, true);
-      webkit_settings_set_enable_developer_extras(settings, true);
-    }
-    else
-    {
-      g_signal_connect(G_OBJECT(w->priv.webview), "context-menu",
-                       G_CALLBACK(webview_context_menu_cb), w);
-    }
-
-    gtk_widget_show_all(w->priv.window);
-
-    webkit_web_view_run_javascript(
-        WEBKIT_WEB_VIEW(w->priv.webview),
-        "window.external={invoke:function(x){"
-        "window.webkit.messageHandlers.external.postMessage(x);}}",
-        NULL, NULL, NULL);
-
-    g_signal_connect(G_OBJECT(w->priv.window), "destroy",
-                     G_CALLBACK(webview_destroy_cb), w);
-    return 0;
-  }
-
-  WEBVIEW_API int webview_loop(struct webview *w, int blocking)
-  {
-    gtk_main_iteration_do(blocking);
-    return w->priv.should_exit;
-  }
-
-  WEBVIEW_API void webview_set_title(struct webview *w, const char *title)
-  {
-    gtk_window_set_title(GTK_WINDOW(w->priv.window), title);
-  }
-
-  WEBVIEW_API void webview_set_fullscreen(struct webview *w, int fullscreen)
-  {
-    if (fullscreen)
-    {
-      gtk_window_fullscreen(GTK_WINDOW(w->priv.window));
-    }
-    else
-    {
-      gtk_window_unfullscreen(GTK_WINDOW(w->priv.window));
-    }
-  }
-
-  WEBVIEW_API void webview_set_color(struct webview *w, uint8_t r, uint8_t g,
-                                     uint8_t b, uint8_t a)
-  {
-    GdkRGBA color = {r / 255.0, g / 255.0, b / 255.0, a / 255.0};
-    webkit_web_view_set_background_color(WEBKIT_WEB_VIEW(w->priv.webview),
-                                         &color);
-  }
-
-  WEBVIEW_API void webview_dialog(struct webview *w,
-                                  enum webview_dialog_type dlgtype, int flags,
-                                  const char *title, const char *arg,
-                                  char *result, size_t resultsz, char *filter)
-  {
-    GtkWidget *dlg;
-    if (result != NULL)
-    {
-      result[0] = '\0';
-    }
-    if (dlgtype == WEBVIEW_DIALOG_TYPE_OPEN ||
-        dlgtype == WEBVIEW_DIALOG_TYPE_SAVE)
-    {
-      dlg = gtk_file_chooser_dialog_new(
-          title, GTK_WINDOW(w->priv.window),
-          (dlgtype == WEBVIEW_DIALOG_TYPE_OPEN
-               ? (flags & WEBVIEW_DIALOG_FLAG_DIRECTORY
-                      ? GTK_FILE_CHOOSER_ACTION_SELECT_FOLDER
-                      : GTK_FILE_CHOOSER_ACTION_OPEN)
-               : GTK_FILE_CHOOSER_ACTION_SAVE),
-          "_Cancel", GTK_RESPONSE_CANCEL,
-          (dlgtype == WEBVIEW_DIALOG_TYPE_OPEN ? "_Open" : "_Save"),
-          GTK_RESPONSE_ACCEPT, NULL);
-      if (filter[0] != '\0') {
-          GtkFileFilter *file_filter = gtk_file_filter_new();
-          gchar **filters  = g_strsplit(filter, ",", -1);
-          gint i;
-          for(i = 0; filters && filters[i]; i++) {
-              gtk_file_filter_add_pattern(file_filter, filters[i]);
-          }
-          gtk_file_filter_set_name(file_filter, filter);
-          gtk_file_chooser_add_filter(GTK_FILE_CHOOSER(dlg), file_filter);
-          g_strfreev(filters);
-      }
-      gtk_file_chooser_set_local_only(GTK_FILE_CHOOSER(dlg), FALSE);
-      gtk_file_chooser_set_select_multiple(GTK_FILE_CHOOSER(dlg), FALSE);
-      gtk_file_chooser_set_show_hidden(GTK_FILE_CHOOSER(dlg), TRUE);
-      gtk_file_chooser_set_do_overwrite_confirmation(GTK_FILE_CHOOSER(dlg), TRUE);
-      gtk_file_chooser_set_create_folders(GTK_FILE_CHOOSER(dlg), TRUE);
-      gint response = gtk_dialog_run(GTK_DIALOG(dlg));
-      if (response == GTK_RESPONSE_ACCEPT)
-      {
-        gchar *filename = gtk_file_chooser_get_filename(GTK_FILE_CHOOSER(dlg));
-        g_strlcpy(result, filename, resultsz);
-        g_free(filename);
-      }
-      gtk_widget_destroy(dlg);
-    }
-    else if (dlgtype == WEBVIEW_DIALOG_TYPE_ALERT)
-    {
-      GtkMessageType type = GTK_MESSAGE_OTHER;
-      switch (flags & WEBVIEW_DIALOG_FLAG_ALERT_MASK)
-      {
-      case WEBVIEW_DIALOG_FLAG_INFO:
-        type = GTK_MESSAGE_INFO;
-        break;
-      case WEBVIEW_DIALOG_FLAG_WARNING:
-        type = GTK_MESSAGE_WARNING;
-        break;
-      case WEBVIEW_DIALOG_FLAG_ERROR:
-        type = GTK_MESSAGE_ERROR;
-        break;
-      }
-      dlg = gtk_message_dialog_new(GTK_WINDOW(w->priv.window), GTK_DIALOG_MODAL,
-                                   type, GTK_BUTTONS_OK, "%s", title);
-      gtk_message_dialog_format_secondary_text(GTK_MESSAGE_DIALOG(dlg), "%s",
-                                               arg);
-      gtk_dialog_run(GTK_DIALOG(dlg));
-      gtk_widget_destroy(dlg);
-    }
-  }
-
-  static void webview_eval_finished(GObject *object, GAsyncResult *result,
-                                    gpointer userdata)
-  {
-    (void)object;
-    (void)result;
-    struct webview *w = (struct webview *)userdata;
-    w->priv.js_busy = 0;
-  }
-
-  WEBVIEW_API int webview_eval(struct webview *w, const char *js)
-  {
-    while (w->priv.ready == 0)
-    {
-      g_main_context_iteration(NULL, TRUE);
-    }
-    w->priv.js_busy = 1;
-    webkit_web_view_run_javascript(WEBKIT_WEB_VIEW(w->priv.webview), js, NULL,
-                                   webview_eval_finished, w);
-    while (w->priv.js_busy)
-    {
-      g_main_context_iteration(NULL, TRUE);
-    }
-    return 0;
-  }
-
-  static gboolean webview_dispatch_wrapper(gpointer userdata)
-  {
-    struct webview *w = (struct webview *)userdata;
-    for (;;)
-    {
-      struct webview_dispatch_arg *arg =
-          (struct webview_dispatch_arg *)g_async_queue_try_pop(w->priv.queue);
-      if (arg == NULL)
-      {
-        break;
-      }
-      (arg->fn)(w, arg->arg);
-      g_free(arg);
-    }
-    return FALSE;
-  }
-
-  WEBVIEW_API void webview_dispatch(struct webview *w, webview_dispatch_fn fn,
-                                    void *arg)
-  {
-    struct webview_dispatch_arg *context =
-        (struct webview_dispatch_arg *)g_new(struct webview_dispatch_arg *, 1);
-    context->w = w;
-    context->arg = arg;
-    context->fn = fn;
-    g_async_queue_lock(w->priv.queue);
-    g_async_queue_push_unlocked(w->priv.queue, context);
-    if (g_async_queue_length_unlocked(w->priv.queue) == 1)
-    {
-      gdk_threads_add_idle(webview_dispatch_wrapper, w);
-    }
-    g_async_queue_unlock(w->priv.queue);
-  }
-
-  WEBVIEW_API void webview_terminate(struct webview *w)
-  {
-    w->priv.should_exit = 1;
-  }
-
-  WEBVIEW_API void webview_exit(struct webview *w) { (void)w; }
-  WEBVIEW_API void webview_print_log(const char *s)
-  {
-    fprintf(stderr, "%s\n", s);
-  }
-
-#endif /* WEBVIEW_GTK */
-
 #if defined(WEBVIEW_WINAPI)
 
 #pragma comment(lib, "user32.lib")
@@ -1431,6 +1100,13 @@ struct webview_priv
       style = WS_OVERLAPPED | WS_CAPTION | WS_MINIMIZEBOX | WS_SYSMENU;
     }
 
+    // Scale
+    // Credit: https://github.com/webview/webview/issues/54#issuecomment-379528243
+    HDC hDC = GetDC(NULL);
+    w->width = GetDeviceCaps(hDC, 88)*w->width/96.0;
+    w->height = GetDeviceCaps(hDC, 90)*w->height/96.0;
+    ReleaseDC(NULL, hDC);
+
     rect.left = 0;
     rect.top = 0;
     rect.right = w->width;
@@ -1923,433 +1599,6 @@ struct webview_priv
   WEBVIEW_API void webview_exit(struct webview *w) { OleUninitialize(); }
   WEBVIEW_API void webview_print_log(const char *s) { OutputDebugString(s); }
 
-#endif /* WEBVIEW_WINAPI */
-
-#if defined(WEBVIEW_COCOA)
-#if (!defined MAC_OS_X_VERSION_10_12) || \
-    MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_12
-#define NSAlertStyleWarning NSWarningAlertStyle
-#define NSAlertStyleCritical NSCriticalAlertStyle
-#define NSWindowStyleMaskResizable NSResizableWindowMask
-#define NSWindowStyleMaskMiniaturizable NSMiniaturizableWindowMask
-#define NSWindowStyleMaskTitled NSTitledWindowMask
-#define NSWindowStyleMaskClosable NSClosableWindowMask
-#define NSWindowStyleMaskFullScreen NSFullScreenWindowMask
-#define NSEventMaskAny NSAnyEventMask
-#define NSEventModifierFlagCommand NSCommandKeyMask
-#define NSEventModifierFlagOption NSAlternateKeyMask
-#define NSAlertStyleInformational NSInformationalAlertStyle
-#endif /* MAC_OS_X_VERSION_10_12 */
-#if (!defined MAC_OS_X_VERSION_10_13) || \
-    MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_13
-#define NSModalResponseOK NSFileHandlingPanelOKButton
-#endif /* MAC_OS_X_VERSION_10_12, MAC_OS_X_VERSION_10_13 */
-  static void webview_window_will_close(id self, SEL cmd, id notification)
-  {
-    struct webview *w =
-        (struct webview *)objc_getAssociatedObject(self, "webview");
-    webview_terminate(w);
-  }
-
-  static BOOL webview_is_selector_excluded_from_web_script(id self, SEL cmd,
-                                                           SEL selector)
-  {
-    return selector != @selector(invoke:);
-  }
-
-  static NSString *webview_webscript_name_for_selector(id self, SEL cmd,
-                                                       SEL selector)
-  {
-    return selector == @selector(invoke:) ? @"invoke" : nil;
-  }
-
-  static void webview_did_clear_window_object(id self, SEL cmd, id webview,
-                                              id script, id frame)
-  {
-    [script setValue:self forKey:@"external"];
-  }
-
-  static void webview_run_input_open_panel(id self, SEL cmd, id webview,
-                                           id listener, BOOL allowMultiple)
-  {
-    char filename[256] = "";
-    struct webview *w =
-        (struct webview *)objc_getAssociatedObject(self, "webview");
-
-    webview_dialog(w, WEBVIEW_DIALOG_TYPE_OPEN, WEBVIEW_DIALOG_FLAG_FILE, "", "",
-                   filename, 255, "");
-    filename[255] = '\0';
-    if (strlen(filename) > 0)
-    {
-      [listener chooseFilename:[NSString stringWithUTF8String:filename]];
-    }
-    else
-    {
-      [listener cancel];
-    }
-  }
-
-  static void webview_external_invoke(id self, SEL cmd, id arg)
-  {
-    struct webview *w =
-        (struct webview *)objc_getAssociatedObject(self, "webview");
-    if (w == NULL || w->external_invoke_cb == NULL)
-    {
-      return;
-    }
-    if ([arg isKindOfClass:[NSString class]] == NO)
-    {
-      return;
-    }
-    w->external_invoke_cb(w, [(NSString *)(arg) UTF8String]);
-  }
-
-  WEBVIEW_API int webview_init(struct webview *w)
-  {
-    w->priv.pool = [[NSAutoreleasePool alloc] init];
-    [NSApplication sharedApplication];
-
-    Class webViewDelegateClass =
-        objc_allocateClassPair([NSObject class], "WebViewDelegate", 0);
-    class_addMethod(webViewDelegateClass, sel_registerName("windowWillClose:"),
-                    (IMP)webview_window_will_close, "v@:@");
-    class_addMethod(object_getClass(webViewDelegateClass),
-                    sel_registerName("isSelectorExcludedFromWebScript:"),
-                    (IMP)webview_is_selector_excluded_from_web_script, "c@::");
-    class_addMethod(object_getClass(webViewDelegateClass),
-                    sel_registerName("webScriptNameForSelector:"),
-                    (IMP)webview_webscript_name_for_selector, "c@::");
-    class_addMethod(webViewDelegateClass,
-                    sel_registerName("webView:didClearWindowObject:forFrame:"),
-                    (IMP)webview_did_clear_window_object, "v@:@@@");
-    class_addMethod(
-        webViewDelegateClass,
-        sel_registerName("webView:runOpenPanelForFileButtonWithResultListener:"
-                         "allowMultipleFiles:"),
-        (IMP)webview_run_input_open_panel, "v@:@@c");
-    class_addMethod(webViewDelegateClass, sel_registerName("invoke:"),
-                    (IMP)webview_external_invoke, "v@:@");
-    objc_registerClassPair(webViewDelegateClass);
-
-    w->priv.delegate = [[webViewDelegateClass alloc] init];
-    objc_setAssociatedObject(w->priv.delegate, "webview", (id)(w),
-                             OBJC_ASSOCIATION_ASSIGN);
-
-    NSRect r = NSMakeRect(0, 0, w->width, w->height);
-    NSUInteger style = NSWindowStyleMaskTitled | NSWindowStyleMaskClosable |
-                       NSWindowStyleMaskMiniaturizable;
-    if (w->resizable)
-    {
-      style = style | NSWindowStyleMaskResizable;
-      // style = style | NSTexturedBackgroundWindowMask;
-      // style = style | NSUnifiedTitleAndToolbarWindowMask;
-    }
-
-    // Transparent title bar
-    // if (w->transparentTitlebar) {
-    //   style = style | NSFullSizeContentViewWindowMask | NSUnifiedTitleAndToolbarWindowMask | NSTexturedBackgroundWindowMask;
-    // }
-
-    w->priv.window = [[NSWindow alloc] initWithContentRect:r
-                                                 styleMask:style
-                                                   backing:NSBackingStoreBuffered
-                                                     defer:NO];
-    [w->priv.window autorelease];
-
-    // Title
-    NSString *nsTitle = [NSString stringWithUTF8String:w->title];
-    [w->priv.window setTitle:nsTitle];
-
-    [w->priv.window setDelegate:w->priv.delegate];
-    [w->priv.window center];
-
-    //  NSToolbar *toolbar = [[NSToolbar alloc] initWithIdentifier:@"wat"];
-    //   toolbar.showsBaselineSeparator = NO;
-    //   [w->priv.window setToolbar:toolbar];
-
-    // if (w->transparentTitlebar) {
-
-    //   // Configure window look with hidden toolbar
-    //   [w->priv.window setTitlebarAppearsTransparent:YES];
-    //   [w->priv.window setTitleVisibility:NSWindowTitleHidden];
-    //   // w->priv.window.isMovableByWindowBackground = true;
-    // }
-
-    [[NSUserDefaults standardUserDefaults] setBool:!!w->debug
-                                            forKey:@"WebKitDeveloperExtras"];
-    [[NSUserDefaults standardUserDefaults] synchronize];
-    w->priv.webview =
-        [[WebView alloc] initWithFrame:r
-                             frameName:@"WebView"
-                             groupName:nil];
-    NSURL *nsURL = [NSURL
-        URLWithString:[NSString stringWithUTF8String:webview_check_url(w->url)]];
-    [[w->priv.webview mainFrame] loadRequest:[NSURLRequest requestWithURL:nsURL]];
-
-    [w->priv.webview setAutoresizesSubviews:YES];
-    [w->priv.webview
-        setAutoresizingMask:NSViewWidthSizable | NSViewHeightSizable];
-    w->priv.webview.frameLoadDelegate = w->priv.delegate;
-    w->priv.webview.UIDelegate = w->priv.delegate;
-    [[w->priv.window contentView] addSubview:w->priv.webview];
-    [w->priv.window orderFrontRegardless];
-
-    // Disable scrolling - make this configurable
-    // [[[w->priv.webview mainFrame] frameView] setAllowsScrolling:NO];
-
-    // ----> Enables WebGL but won't pass the app store guidelines
-    //
-    // WebPreferences *p = [w->priv.webview preferences];
-    // if ([p respondsToSelector:@selector(setWebGLEnabled:)]) {
-    //     [p setWebGLEnabled:YES];
-    // }
-
-    [NSApp setActivationPolicy:NSApplicationActivationPolicyRegular];
-    [NSApp finishLaunching];
-    [NSApp activateIgnoringOtherApps:YES];
-
-    NSMenu *menubar = [[[NSMenu alloc] initWithTitle:@""] autorelease];
-
-    NSMenuItem *appMenuItem =
-        [[[NSMenuItem alloc] initWithTitle:@"wails app" action:NULL keyEquivalent:@""]
-            autorelease];
-    NSMenu *appMenu = [[[NSMenu alloc] initWithTitle:@"wails app"] autorelease];
-    [appMenuItem setSubmenu:appMenu];
-    [menubar addItem:appMenuItem];
-
-    NSMenuItem *item = [[[NSMenuItem alloc] initWithTitle:@"Hide"
-                                                   action:@selector(hide:)
-                                            keyEquivalent:@"h"] autorelease];
-    [appMenu addItem:item];
-    item = [[[NSMenuItem alloc] initWithTitle:@"Hide Others"
-                                       action:@selector(hideOtherApplications:)
-                                keyEquivalent:@"h"] autorelease];
-    [item setKeyEquivalentModifierMask:(NSEventModifierFlagOption |
-                                        NSEventModifierFlagCommand)];
-    [appMenu addItem:item];
-    item = [[[NSMenuItem alloc] initWithTitle:@"Show All"
-                                       action:@selector(unhideAllApplications:)
-                                keyEquivalent:@""] autorelease];
-    [appMenu addItem:item];
-    [appMenu addItem:[NSMenuItem separatorItem]];
-
-    NSMenuItem *editMenuItem =
-        [[[NSMenuItem alloc] initWithTitle:@"Edit" action:NULL keyEquivalent:@""]
-            autorelease];
-    NSMenu *editMenu = [[[NSMenu alloc] initWithTitle:@"Edit"] autorelease];
-    [editMenuItem setSubmenu:editMenu];
-    [menubar addItem:editMenuItem];
-
-    item = [[[NSMenuItem alloc] initWithTitle:@"Cut"
-                                       action:@selector(cut:)
-                                keyEquivalent:@"x"] autorelease];
-    [editMenu addItem:item];
-
-    item = [[[NSMenuItem alloc] initWithTitle:@"Copy"
-                                       action:@selector(copy:)
-                                keyEquivalent:@"c"] autorelease];
-    [editMenu addItem:item];
-
-    item = [[[NSMenuItem alloc] initWithTitle:@"Paste"
-                                       action:@selector(paste:)
-                                keyEquivalent:@"v"] autorelease];
-    [editMenu addItem:item];
-
-    item = [[[NSMenuItem alloc] initWithTitle:@"Select All"
-                                       action:@selector(selectAll:)
-                                keyEquivalent:@"a"] autorelease];
-    [editMenu addItem:item];
-
-    [appMenu addItem:[NSMenuItem separatorItem]];
-
-    item = [[[NSMenuItem alloc] initWithTitle:@"Quit"
-                                       action:@selector(terminate:)
-                                keyEquivalent:@"q"] autorelease];
-    [appMenu addItem:item];
-
-    [NSApp setMainMenu:menubar];
-
-    w->priv.should_exit = 0;
-    return 0;
-  }
-
-  WEBVIEW_API int webview_loop(struct webview *w, int blocking)
-  {
-    NSDate *until = (blocking ? [NSDate distantFuture] : [NSDate distantPast]);
-    NSEvent *event = [NSApp nextEventMatchingMask:NSEventMaskAny
-                                        untilDate:until
-                                           inMode:NSDefaultRunLoopMode
-                                          dequeue:YES];
-    if (event)
-    {
-      [NSApp sendEvent:event];
-    }
-    return w->priv.should_exit;
-  }
-
-  WEBVIEW_API int webview_eval(struct webview *w, const char *js)
-  {
-    NSString *nsJS = [NSString stringWithUTF8String:js];
-    [[w->priv.webview windowScriptObject] evaluateWebScript:nsJS];
-    return 0;
-  }
-
-  WEBVIEW_API void webview_set_title(struct webview *w, const char *title)
-  {
-    NSString *nsTitle = [NSString stringWithUTF8String:title];
-    [w->priv.window setTitle:nsTitle];
-  }
-
-  WEBVIEW_API void webview_set_fullscreen(struct webview *w, int fullscreen)
-  {
-    int b = ((([w->priv.window styleMask] & NSWindowStyleMaskFullScreen) ==
-              NSWindowStyleMaskFullScreen)
-                 ? 1
-                 : 0);
-    if (b != fullscreen)
-    {
-      [w->priv.window toggleFullScreen:nil];
-    }
-  }
-
-  WEBVIEW_API void webview_set_color(struct webview *w, uint8_t r, uint8_t g,
-                                     uint8_t b, uint8_t a)
-  {
-    [w->priv.window setBackgroundColor:[NSColor colorWithRed:(CGFloat)r / 255.0
-                                                       green:(CGFloat)g / 255.0
-                                                        blue:(CGFloat)b / 255.0
-                                                       alpha:(CGFloat)a / 255.0]];
-    if (0.5 >= ((r / 255.0 * 299.0) + (g / 255.0 * 587.0) + (b / 255.0 * 114.0)) /
-                   1000.0)
-    {
-      [w->priv.window
-          setAppearance:[NSAppearance
-                            appearanceNamed:NSAppearanceNameVibrantDark]];
-    }
-    else
-    {
-      [w->priv.window
-          setAppearance:[NSAppearance
-                            appearanceNamed:NSAppearanceNameVibrantLight]];
-    }
-    [w->priv.window setOpaque:NO];
-    [w->priv.window setTitlebarAppearsTransparent:YES];
-    [w->priv.webview setDrawsBackground:NO];
-  }
-
-  WEBVIEW_API void webview_dialog(struct webview *w,
-                                  enum webview_dialog_type dlgtype, int flags,
-                                  const char *title, const char *arg,
-                                  char *result, size_t resultsz, char *filter)
-  {
-    if (dlgtype == WEBVIEW_DIALOG_TYPE_OPEN ||
-        dlgtype == WEBVIEW_DIALOG_TYPE_SAVE)
-    {
-      NSSavePanel *panel;
-      NSString *filter_str = [NSString stringWithUTF8String:filter];
-      filter_str = [filter_str stringByReplacingOccurrencesOfString:@"*."
-                                     withString:@""];
-      NSArray *fileTypes = [filter_str componentsSeparatedByString:@","];
-      if (dlgtype == WEBVIEW_DIALOG_TYPE_OPEN)
-      {
-        NSOpenPanel *openPanel = [NSOpenPanel openPanel];
-        if (flags & WEBVIEW_DIALOG_FLAG_DIRECTORY)
-        {
-          [openPanel setCanChooseFiles:NO];
-          [openPanel setCanChooseDirectories:YES];
-        }
-        else
-        {
-          [openPanel setCanChooseFiles:YES];
-          [openPanel setCanChooseDirectories:NO];
-          if(filter[0] != NULL)
-          {
-            [openPanel setAllowedFileTypes:fileTypes];
-          }
-        }
-        [openPanel setResolvesAliases:NO];
-        [openPanel setAllowsMultipleSelection:NO];
-        panel = openPanel;
-      }
-      else
-      {
-        panel = [NSSavePanel savePanel];
-      }
-      [panel setCanCreateDirectories:YES];
-      [panel setShowsHiddenFiles:YES];
-      [panel setExtensionHidden:NO];
-      [panel setCanSelectHiddenExtension:NO];
-      if(filter[0] != NULL)
-      {
-        [panel setAllowedFileTypes:fileTypes];
-      }
-      [panel setTreatsFilePackagesAsDirectories:YES];
-      [panel beginSheetModalForWindow:w->priv.window
-                    completionHandler:^(NSInteger result) {
-                      [NSApp stopModalWithCode:result];
-                    }];
-      if ([NSApp runModalForWindow:panel] == NSModalResponseOK)
-      {
-        const char *filename = [[[panel URL] path] UTF8String];
-        strlcpy(result, filename, resultsz);
-      }
-    }
-    else if (dlgtype == WEBVIEW_DIALOG_TYPE_ALERT)
-    {
-      NSAlert *a = [NSAlert new];
-      switch (flags & WEBVIEW_DIALOG_FLAG_ALERT_MASK)
-      {
-      case WEBVIEW_DIALOG_FLAG_INFO:
-        [a setAlertStyle:NSAlertStyleInformational];
-        break;
-      case WEBVIEW_DIALOG_FLAG_WARNING:
-        NSLog(@"warning");
-        [a setAlertStyle:NSAlertStyleWarning];
-        break;
-      case WEBVIEW_DIALOG_FLAG_ERROR:
-        NSLog(@"error");
-        [a setAlertStyle:NSAlertStyleCritical];
-        break;
-      }
-      [a setShowsHelp:NO];
-      [a setShowsSuppressionButton:NO];
-      [a setMessageText:[NSString stringWithUTF8String:title]];
-      [a setInformativeText:[NSString stringWithUTF8String:arg]];
-      [a addButtonWithTitle:@"OK"];
-      [a runModal];
-      [a release];
-    }
-  }
-
-  static void webview_dispatch_cb(void *arg)
-  {
-    struct webview_dispatch_arg *context = (struct webview_dispatch_arg *)arg;
-    (context->fn)(context->w, context->arg);
-    free(context);
-  }
-
-  WEBVIEW_API void webview_dispatch(struct webview *w, webview_dispatch_fn fn,
-                                    void *arg)
-  {
-    struct webview_dispatch_arg *context = (struct webview_dispatch_arg *)malloc(
-        sizeof(struct webview_dispatch_arg));
-    context->w = w;
-    context->arg = arg;
-    context->fn = fn;
-    dispatch_async_f(dispatch_get_main_queue(), context, webview_dispatch_cb);
-  }
-
-  WEBVIEW_API void webview_terminate(struct webview *w)
-  {
-    w->priv.should_exit = 1;
-  }
-  WEBVIEW_API void webview_exit(struct webview *w) { [NSApp terminate:NSApp]; }
-  WEBVIEW_API void webview_print_log(const char *s) { NSLog(@"%s", s); }
-
-#endif /* WEBVIEW_COCOA */
-
-#endif /* WEBVIEW_IMPLEMENTATION */
-
 #ifdef __cplusplus
 }
 #endif

runtime.go

@@ -1,32 +0,0 @@
-package wails
-
-import (
-	"github.com/wailsapp/wails/lib/interfaces"
-	"github.com/wailsapp/wails/lib/logger"
-	"github.com/wailsapp/wails/runtime"
-)
-
-// CustomLogger type alias
-type CustomLogger = logger.CustomLogger
-
-// Runtime is the Wails Runtime Interface, given to a user who has defined the WailsInit method
-type Runtime struct {
-	Events     *runtime.Events
-	Log        *runtime.Log
-	Dialog     *runtime.Dialog
-	Window     *runtime.Window
-	Browser    *runtime.Browser
-	FileSystem *runtime.FileSystem
-}
-
-// NewRuntime creates a new Runtime struct
-func NewRuntime(eventManager interfaces.EventManager, renderer interfaces.Renderer) *Runtime {
-	return &Runtime{
-		Events:     runtime.NewEvents(eventManager),
-		Log:        runtime.NewLog(),
-		Dialog:     runtime.NewDialog(renderer),
-		Window:     runtime.NewWindow(renderer),
-		Browser:    runtime.NewBrowser(),
-		FileSystem: runtime.NewFileSystem(),
-	}
-}

runtime/js/core/main.js

@@ -15,6 +15,7 @@ import { NewBinding } from './bindings';
 import { Callback } from './calls';
 import { AddScript, InjectCSS } from './utils';
 import { AddIPCListener } from './ipc';
+import * as Store from './store';
 
 // Initialise global if not already
 window.wails = window.wails || {};
@@ -42,6 +43,7 @@ var runtime = {
 		Heartbeat,
 		Acknowledge,
 	},
+	Store,
 	_: internal,
 };
 

runtime/js/core/store.js

@@ -0,0 +1,82 @@
+/*
+ _       __      _ __    
+| |     / /___ _(_) /____
+| | /| / / __ `/ / / ___/
+| |/ |/ / /_/ / / (__  ) 
+|__/|__/\__,_/_/_/____/  
+The lightweight framework for web-like apps
+(c) Lea Anthony 2019-present
+*/
+/* jshint esversion: 6 */
+
+/**
+ * Creates a new sync store with the given name and optional default value
+ *
+ * @export
+ * @param {string} name
+ * @param {*} optionalDefault
+ */
+export function New(name, optionalDefault) {
+
+	var data;
+
+	// Check we are initialised
+	if( !window.wails) {
+		throw Error('Wails is not initialised');
+	}
+
+	// Store for the callbacks
+	let callbacks = [];
+	
+	// Subscribe to updates by providing a callback
+	this.subscribe = (callback) => {
+		callbacks.push(callback);
+	};
+
+	// sets the store data to the provided `newdata` value
+	this.set = (newdata) => {
+		
+		data = newdata;
+
+		// Emit a notification to back end
+		window.wails.Events.Emit('wails:sync:store:updatedbyfrontend:'+name, JSON.stringify(data));
+
+		// Notify callbacks
+		callbacks.forEach( function(callback) {
+			callback(data);
+		});
+	};
+
+	// update mutates the value in the store by calling the
+	// provided method with the current value. The value returned 
+	// by the updater function will be set as the new store value
+	this.update = (updater) => {
+		var newValue = updater(data);
+		this.set(newValue);
+	};
+
+	// Setup event callback
+	window.wails.Events.On('wails:sync:store:updatedbybackend:'+name, function(result) {
+
+		// Parse data
+		result = JSON.parse(result);
+
+		// Todo: Potential preprocessing?
+
+		// Save data
+		data = result;
+
+		// Notify callbacks
+		callbacks.forEach( function(callback) {
+			callback(data);
+		});
+
+	});
+
+	// Set to the optional default if set
+	if( optionalDefault ) {
+		this.set(optionalDefault);
+	}
+
+	return this;
+}

runtime/js/runtime/main.js

@@ -13,10 +13,12 @@ const Log = require('./log');
 const Browser = require('./browser');
 const Events = require('./events');
 const Init = require('./init');
+const Store = require('./store');
 
 module.exports = {
 	Log: Log,
 	Browser: Browser,
 	Events: Events,
-	Init: Init
+	Init: Init,
+	Store: Store,
 };

runtime/js/runtime/package-lock.json

@@ -0,0 +1,492 @@
+{
+  "name": "@wailsapp/runtime",
+  "version": "1.1.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "ansi-regex": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+      "dev": true
+    },
+    "camelcase": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-3.0.0.tgz",
+      "integrity": "sha1-MvxLn82vhF/N9+c7uXysImHwqwo=",
+      "dev": true
+    },
+    "cliui": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/cliui/-/cliui-3.2.0.tgz",
+      "integrity": "sha1-EgYBU3qRbSmUD5NNo7SNWFo5IT0=",
+      "dev": true,
+      "requires": {
+        "string-width": "^1.0.1",
+        "strip-ansi": "^3.0.1",
+        "wrap-ansi": "^2.0.0"
+      }
+    },
+    "code-point-at": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
+      "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=",
+      "dev": true
+    },
+    "decamelize": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/decamelize/-/decamelize-1.2.0.tgz",
+      "integrity": "sha1-9lNNFRSCabIDUue+4m9QH5oZEpA=",
+      "dev": true
+    },
+    "dts-dom": {
+      "version": "3.6.0",
+      "resolved": "https://registry.npmjs.org/dts-dom/-/dts-dom-3.6.0.tgz",
+      "integrity": "sha512-on5jxTgt+A6r0Zyyz6ZRHXaAO7J1VPnOd6+AmvI1vH440AlAZZNc5rUHzgPuTjGlrVr1rOWQYNl7ZJK6rDohbw==",
+      "dev": true
+    },
+    "dts-gen": {
+      "version": "0.5.8",
+      "resolved": "https://registry.npmjs.org/dts-gen/-/dts-gen-0.5.8.tgz",
+      "integrity": "sha512-kIAV6dlHaF7r5J+tIuOC1BJls2P72YM0cyWQUR88zcJEpX2ccRZe+HmXLfkkvfPwjvSO3FEqUiyC8On/grx5qw==",
+      "dev": true,
+      "requires": {
+        "dts-dom": "^3.6.0",
+        "parse-git-config": "^1.1.1",
+        "typescript": "^3.5.1",
+        "yargs": "^4.8.1"
+      }
+    },
+    "error-ex": {
+      "version": "1.3.2",
+      "resolved": "https://registry.npmjs.org/error-ex/-/error-ex-1.3.2.tgz",
+      "integrity": "sha512-7dFHNmqeFSEt2ZBsCriorKnn3Z2pj+fd9kmI6QoWw4//DL+icEBfc0U7qJCisqrTsKTjw4fNFy2pW9OqStD84g==",
+      "dev": true,
+      "requires": {
+        "is-arrayish": "^0.2.1"
+      }
+    },
+    "extend-shallow": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/extend-shallow/-/extend-shallow-2.0.1.tgz",
+      "integrity": "sha1-Ua99YUrZqfYQ6huvu5idaxxWiQ8=",
+      "dev": true,
+      "requires": {
+        "is-extendable": "^0.1.0"
+      }
+    },
+    "find-up": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/find-up/-/find-up-1.1.2.tgz",
+      "integrity": "sha1-ay6YIrGizgpgq2TWEOzK1TyyTQ8=",
+      "dev": true,
+      "requires": {
+        "path-exists": "^2.0.0",
+        "pinkie-promise": "^2.0.0"
+      }
+    },
+    "fs-exists-sync": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/fs-exists-sync/-/fs-exists-sync-0.1.0.tgz",
+      "integrity": "sha1-mC1ok6+RjnLQjeyehnP/K1qNat0=",
+      "dev": true
+    },
+    "get-caller-file": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-1.0.3.tgz",
+      "integrity": "sha512-3t6rVToeoZfYSGd8YoLFR2DJkiQrIiUrGcjvFX2mDw3bn6k2OtwHN0TNCLbBO+w8qTvimhDkv+LSscbJY1vE6w==",
+      "dev": true
+    },
+    "git-config-path": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/git-config-path/-/git-config-path-1.0.1.tgz",
+      "integrity": "sha1-bTP37WPbDQ4RgTFQO6s6ykfVRmQ=",
+      "dev": true,
+      "requires": {
+        "extend-shallow": "^2.0.1",
+        "fs-exists-sync": "^0.1.0",
+        "homedir-polyfill": "^1.0.0"
+      }
+    },
+    "graceful-fs": {
+      "version": "4.2.4",
+      "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.2.4.tgz",
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+        "string-width": "^1.0.1",
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+      "integrity": "sha1-hVaN488VD/SfpRgl8DqMiA3cxcQ=",
+      "dev": true,
+      "requires": {
+        "camelcase": "^3.0.0",
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+}

runtime/js/runtime/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@wailsapp/runtime",
-  "version": "1.0.11",
+  "version": "1.1.1",
   "description": "Wails Javascript runtime library",
   "main": "main.js",
   "types": "runtime.d.ts",
@@ -25,4 +25,4 @@
   "devDependencies": {
     "dts-gen": "^0.5.8"
   }
-}
+}

runtime/js/runtime/runtime.d.ts

@@ -21,6 +21,9 @@ declare const wailsapp__runtime: {
         Info(message: string): void;
         Warning(message: string): void;
     };
+    Store: {
+        New(name: string, optionalDefault?: any): any;
+    };
 };
 
 

runtime/js/runtime/store.js

@@ -0,0 +1,27 @@
+/*
+ _       __      _ __    
+| |     / /___ _(_) /____
+| | /| / / __ `/ / / ___/
+| |/ |/ / /_/ / / (__  ) 
+|__/|__/\__,_/_/_/____/  
+The lightweight framework for web-like apps
+(c) Lea Anthony 2019-present
+*/
+
+/* jshint esversion: 6 */
+
+
+/**
+ * Create a new Store with the given name and optional default value
+ *
+ * @export
+ * @param {string} name
+ * @param {*} optionalDefault
+ */
+function New(name, optionalDefault) {
+	return window.wails.Store.New(name, optionalDefault);
+}
+
+module.exports = {
+	New: New,
+};

runtime/runtime.go

@@ -0,0 +1,29 @@
+package runtime
+
+import "github.com/wailsapp/wails/lib/interfaces"
+
+// Runtime is the Wails Runtime Interface, given to a user who has defined the WailsInit method
+type Runtime struct {
+	Events     *Events
+	Log        *Log
+	Dialog     *Dialog
+	Window     *Window
+	Browser    *Browser
+	FileSystem *FileSystem
+	Store      *StoreProvider
+}
+
+// NewRuntime creates a new Runtime struct
+func NewRuntime(eventManager interfaces.EventManager, renderer interfaces.Renderer) *Runtime {
+	result := &Runtime{
+		Events:     NewEvents(eventManager),
+		Log:        NewLog(),
+		Dialog:     NewDialog(renderer),
+		Window:     NewWindow(renderer),
+		Browser:    NewBrowser(),
+		FileSystem: NewFileSystem(),
+	}
+	// We need a reference to itself
+	result.Store = NewStoreProvider(result)
+	return result
+}

runtime/store.go

@@ -0,0 +1,290 @@
+// Package runtime contains all the methods and data structures related to the
+// runtime library of Wails. This includes both Go and JS runtimes.
+package runtime
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"log"
+	"reflect"
+	"sync"
+)
+
+// Options defines the optional data that may be used
+// when creating a Store
+type Options struct {
+
+	// The name of the store
+	Name string
+
+	// The runtime to attach the store to
+	Runtime *Runtime
+
+	// Indicates if notifying Go listeners should be notified of updates
+	// synchronously (on the current thread) or asynchronously using
+	// goroutines
+	NotifySynchronously bool
+}
+
+// StoreProvider is a struct that creates Stores
+type StoreProvider struct {
+	runtime *Runtime
+}
+
+// NewStoreProvider creates new stores using the provided Runtime reference.
+func NewStoreProvider(runtime *Runtime) *StoreProvider {
+	return &StoreProvider{
+		runtime: runtime,
+	}
+}
+
+// Store is where we keep named data
+type Store struct {
+	name                string
+	data                reflect.Value
+	dataType            reflect.Type
+	eventPrefix         string
+	callbacks           []reflect.Value
+	runtime             *Runtime
+	notifySynchronously bool
+
+	// Lock
+	mux sync.Mutex
+
+	// Error handler
+	errorHandler func(error)
+}
+
+// New creates a new store
+func (p *StoreProvider) New(name string, defaultValue interface{}) *Store {
+
+	dataType := reflect.TypeOf(defaultValue)
+
+	result := Store{
+		name:     name,
+		runtime:  p.runtime,
+		data:     reflect.ValueOf(defaultValue),
+		dataType: dataType,
+	}
+
+	// Setup the sync listener
+	result.setupListener()
+
+	return &result
+}
+
+// OnError takes a function that will be called
+// whenever an error occurs
+func (s *Store) OnError(callback func(error)) {
+	s.errorHandler = callback
+}
+
+// Processes the updates sent by the front end
+func (s *Store) processUpdatedData(data string) error {
+
+	// Decode incoming data
+	var rawdata json.RawMessage
+	d := json.NewDecoder(bytes.NewBufferString(data))
+	err := d.Decode(&rawdata)
+	if err != nil {
+		return err
+	}
+
+	// Create a new instance of our data and unmarshal
+	// the received value into it
+	newData := reflect.New(s.dataType).Interface()
+	err = json.Unmarshal(rawdata, &newData)
+	if err != nil {
+		return err
+	}
+
+	// Lock mutex for writing
+	s.mux.Lock()
+
+	// Handle nulls
+	if newData == nil {
+		s.data = reflect.Zero(s.dataType)
+	} else {
+		// Store the resultant value in the data store
+		s.data = reflect.ValueOf(newData).Elem()
+	}
+
+	// Unlock mutex
+	s.mux.Unlock()
+
+	return nil
+}
+
+// Setup listener for front end changes
+func (s *Store) setupListener() {
+
+	// Listen for updates from the front end
+	s.runtime.Events.On("wails:sync:store:updatedbyfrontend:"+s.name, func(data ...interface{}) {
+
+		// Process the incoming data
+		err := s.processUpdatedData(data[0].(string))
+
+		if err != nil {
+			if s.errorHandler != nil {
+				s.errorHandler(err)
+				return
+			}
+		}
+
+		// Notify listeners
+		s.notify()
+	})
+}
+
+// notify the listeners of the current data state
+func (s *Store) notify() {
+
+	// Execute callbacks
+	for _, callback := range s.callbacks {
+
+		// Build args
+		args := []reflect.Value{s.data}
+
+		if s.notifySynchronously {
+			callback.Call(args)
+		} else {
+			go callback.Call(args)
+		}
+
+	}
+}
+
+// Set will update the data held by the store
+// and notify listeners of the change
+func (s *Store) Set(data interface{}) error {
+
+	inType := reflect.TypeOf(data)
+
+	if inType != s.dataType {
+		return fmt.Errorf("invalid data given in Store.Set(). Expected %s, got %s", s.dataType.String(), inType.String())
+	}
+
+	// Save data
+	s.mux.Lock()
+	s.data = reflect.ValueOf(data)
+	s.mux.Unlock()
+
+	// Stringify data
+	newdata, err := json.Marshal(data)
+	if err != nil {
+		if s.errorHandler != nil {
+			return err
+		}
+	}
+
+	// Emit event to front end
+	s.runtime.Events.Emit("wails:sync:store:updatedbybackend:"+s.name, string(newdata))
+
+	// Notify subscribers
+	s.notify()
+
+	return nil
+}
+
+// callbackCheck ensures the given function to Subscribe() is
+// of the correct signature. Absolutely cannot wait for
+// generics to land rather than writing this nonsense.
+func (s *Store) callbackCheck(callback interface{}) error {
+
+	// Get type
+	callbackType := reflect.TypeOf(callback)
+
+	// Check callback is a function
+	if callbackType.Kind() != reflect.Func {
+		return fmt.Errorf("invalid value given to store.Subscribe(). Expected 'func(%s)'", s.dataType.String())
+	}
+
+	// Check input param
+	if callbackType.NumIn() != 1 {
+		return fmt.Errorf("invalid number of parameters given in callback function. Expected 1")
+	}
+
+	// Check input data type
+	if callbackType.In(0) != s.dataType {
+		return fmt.Errorf("invalid type for input parameter given in callback function. Expected %s, got %s", s.dataType.String(), callbackType.In(0))
+	}
+
+	// Check output param
+	if callbackType.NumOut() != 0 {
+		return fmt.Errorf("invalid number of return parameters given in callback function. Expected 0")
+	}
+
+	return nil
+}
+
+// Subscribe will subscribe to updates to the store by
+// providing a callback. Any updates to the store are sent
+// to the callback
+func (s *Store) Subscribe(callback interface{}) {
+
+	err := s.callbackCheck(callback)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	callbackFunc := reflect.ValueOf(callback)
+
+	s.callbacks = append(s.callbacks, callbackFunc)
+}
+
+// updaterCheck ensures the given function to Update() is
+// of the correct signature. Absolutely cannot wait for
+// generics to land rather than writing this nonsense.
+func (s *Store) updaterCheck(updater interface{}) error {
+
+	// Get type
+	updaterType := reflect.TypeOf(updater)
+
+	// Check updater is a function
+	if updaterType.Kind() != reflect.Func {
+		return fmt.Errorf("invalid value given to store.Update(). Expected 'func(%s) %s'", s.dataType.String(), s.dataType.String())
+	}
+
+	// Check input param
+	if updaterType.NumIn() != 1 {
+		return fmt.Errorf("invalid number of parameters given in updater function. Expected 1")
+	}
+
+	// Check input data type
+	if updaterType.In(0) != s.dataType {
+		return fmt.Errorf("invalid type for input parameter given in updater function. Expected %s, got %s", s.dataType.String(), updaterType.In(0))
+	}
+
+	// Check output param
+	if updaterType.NumOut() != 1 {
+		return fmt.Errorf("invalid number of return parameters given in updater function. Expected 1")
+	}
+
+	// Check output data type
+	if updaterType.Out(0) != s.dataType {
+		return fmt.Errorf("invalid type for return parameter given in updater function. Expected %s, got %s", s.dataType.String(), updaterType.Out(0))
+	}
+
+	return nil
+}
+
+// Update takes a function that is passed the current state.
+// The result of that function is then set as the new state
+// of the store. This will notify listeners of the change
+func (s *Store) Update(updater interface{}) {
+
+	err := s.updaterCheck(updater)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	// Build args
+	args := []reflect.Value{s.data}
+
+	// Make call
+	results := reflect.ValueOf(updater).Call(args)
+
+	// We will only have 1 result. Set the store to it
+	s.Set(results[0].Interface())
+}