Method Run

app/app-browser.go:59–97

Run starts the update loop. It calls the user-provided update function every frame.

(update func(rend *renderer.Renderer, deltaTime time.Duration))

// Run starts the update loop.
// It calls the user-provided update function every frame.
func (a *Application) Run(update func(rend *renderer.Renderer, deltaTime time.Duration)) {

	// Create channel so later we can prevent application from finishing while we wait for callbacks
	done := make(chan bool)

	// Initialize start and frame time
	a.startTime = time.Now()
	a.frameStart = time.Now()

	// Set up recurring calls to user's update function
	var tick js.Func
	tick = js.FuncOf(func(this js.Value, args []js.Value) interface{} {
		// Update frame start and frame delta
		now := time.Now()
		a.frameDelta = now.Sub(a.frameStart)
		a.frameStart = now
		// Call user's update function
		update(a.renderer, a.frameDelta)
		// Set up new callback if not exiting
		if !a.exit {
			a.cbid = js.Global().Call("requestAnimationFrame", tick)
		} else {
			a.Dispatch(OnExit, nil)
			done <- true // Write to done channel to exit the app
		}
		return nil
	})
	defer tick.Release()

	a.cbid = js.Global().Call("requestAnimationFrame", tick)

	// Read from done channel
	// This channel will be empty (except when we want to exit the app)
	// It keeps the app from finishing while we wait for the next call to tick()
	<-done

	// Destroy the window
	a.IWindow.Destroy()
}

// Exit exits the app.
func (a *Application) Exit() {