Update vanilla template

cmd/templates/vanilla/counter.go

@@ -0,0 +1,61 @@
+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)
+}