wails/cmd/templates/vanilla/counter.go

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")
	c.store.Set(0)
	return nil
}

// RandomValue sets the counter to a random value
func (c *Counter) RandomValue() {
	c.store.Set(rand.Intn(1000))
}

func (c *Counter) getInt(data interface{}) int {

	switch value := data.(type) {
	case float64:
		// All numbers sent by the frontend are float64
		// so we need to convert it back to an int
		return int(value)
	default:
		return value.(int)
	}
}

// Increment will increment the counter
func (c *Counter) Increment() {

	increment := func(data interface{}) interface{} {
		currentValue := c.getInt(data)
		return currentValue + 1
	}

	// Update the store using the increment function
	c.store.Update(increment)
}

// Decrement will decrement the counter
func (c *Counter) Decrement() {

	decrement := func(data interface{}) interface{} {
		currentValue := c.getInt(data)
		return currentValue - 1
	}
	// Update the store using the decrement function
	c.store.Update(decrement)
}