Addressing comments & fix pointer warning

application.go

@@ -157,21 +157,6 @@ func (a *Application) Run() error {
 
 	// Create a messenger and init plugins
 	messenger := newMessenger(a.engine)
-	for _, p := range a.config.plugins {
-		err = p.InitPlugin(messenger)
-		if err != nil {
-			return errors.Wrap(err, "failed to initialize plugin "+fmt.Sprintf("%T", p))
-		}
-
-		// Extra init call for plugins that satisfy the PluginGLFW interface.
-		if glfwPlugin, ok := p.(PluginGLFW); ok {
-			err = glfwPlugin.InitPluginGLFW(a.window)
-			if err != nil {
-				return errors.Wrap(err, "failed to initialize glfw plugin"+fmt.Sprintf("%T", p))
-			}
-		}
-	}
-
 	// Create a TextureRegistry
 	texturer := newTextureRegistry(a.engine, a.window)
 
@@ -263,17 +248,21 @@ func (a *Application) Run() error {
 		os.Exit(1)
 	}
 
-	// Setup a new windowManager to handle windows pixel ratio's and pointer
-	// devices.
-	windowManager := newWindowManager(a.config.forcePixelRatio)
-	// force first refresh
-	windowManager.glfwRefreshCallback(a.window)
-	// Attach glfw window callbacks for refresh and position changes
-	a.window.SetRefreshCallback(windowManager.glfwRefreshCallback)
-	a.window.SetPosCallback(windowManager.glfwPosCallback)
-
-	// TODO: Can this only be done here? Why not in the plugin/glfwPlugin init loop above?
+	// Register plugins
 	for _, p := range a.config.plugins {
+		err = p.InitPlugin(messenger)
+		if err != nil {
+			return errors.Wrap(err, "failed to initialize plugin "+fmt.Sprintf("%T", p))
+		}
+
+		// Extra init call for plugins that satisfy the PluginGLFW interface.
+		if glfwPlugin, ok := p.(PluginGLFW); ok {
+			err = glfwPlugin.InitPluginGLFW(a.window)
+			if err != nil {
+				return errors.Wrap(err, "failed to initialize glfw plugin"+fmt.Sprintf("%T", p))
+			}
+		}
+
 		// Extra init call for plugins that satisfy the PluginTexture interface.
 		if texturePlugin, ok := p.(PluginTexture); ok {
 			err = texturePlugin.InitPluginTexture(texturer)
@@ -283,6 +272,15 @@ func (a *Application) Run() error {
 		}
 	}
 
+	// Setup a new windowManager to handle windows pixel ratio's and pointer
+	// devices.
+	windowManager := newWindowManager(a.config.forcePixelRatio)
+	// force first refresh
+	windowManager.glfwRefreshCallback(a.window)
+	// Attach glfw window callbacks for refresh and position changes
+	a.window.SetRefreshCallback(windowManager.glfwRefreshCallback)
+	a.window.SetPosCallback(windowManager.glfwPosCallback)
+
 	// Attach glfw window callbacks for text input
 	a.window.SetKeyCallback(
 		func(window *glfw.Window, key glfw.Key, scancode int, action glfw.Action, mods glfw.ModifierKey) {
@@ -313,9 +311,6 @@ func (a *Application) Run() error {
 		messenger.engineTasker.ExecuteTasks()
 	}
 
-	// TODO: What if the window indicates to stop, but there are tasks left on
-	// the queue?
-
 	fmt.Println("go-flutter: closing application")
 
 	return nil

event-loop.go

@@ -22,7 +22,7 @@ type EventLoop struct {
 	onExpiredTask func(*embedder.FlutterTask) embedder.Result
 
 	// timeout for non-Rendering events that needs to be processed in a polling manner
-	maxWaitDuration time.Duration
+	platformMessageRefreshRate time.Duration
 }
 
 func newEventLoop(postEmptyEvent func(), onExpiredTask func(*embedder.FlutterTask) embedder.Result) *EventLoop {
@@ -37,7 +37,11 @@ func newEventLoop(postEmptyEvent func(), onExpiredTask func(*embedder.FlutterTas
 		// platform messages) and not too low (heavy CPU consumption).
 		// This value isn't related to FPS, as rendering events are process in a
 		// waiting manner.
-		maxWaitDuration: time.Duration(25) * time.Millisecond,
+		// Platform message are fetched from the engine every time the rendering
+		// event loop process rendering event (e.g.: moving the cursor on the
+		// window), when no rendering event occur (e.g., window minimized) platform
+		// message are fetch every 25ms.
+		platformMessageRefreshRate: time.Duration(25) * time.Millisecond,
 	}
 }
 
@@ -110,10 +114,10 @@ func (t *EventLoop) WaitForEvents(rendererWaitEvents func(float64)) {
 	// along, the rendererWaitEvents will be resolved early because PostTask
 	// posts an empty event.
 	if t.priorityqueue.Len() == 0 {
-		rendererWaitEvents(t.maxWaitDuration.Seconds())
+		rendererWaitEvents(t.platformMessageRefreshRate.Seconds())
 	} else {
 		if top.FireTime.After(now) {
-			durationWait := math.Min(top.FireTime.Sub(now).Seconds(), t.maxWaitDuration.Seconds())
+			durationWait := math.Min(top.FireTime.Sub(now).Seconds(), t.platformMessageRefreshRate.Seconds())
 			rendererWaitEvents(durationWait)
 		}
 	}

glfw.go

@@ -53,8 +53,6 @@ func (m *windowManager) sendPointerEvent(window *glfw.Window, phase embedder.Poi
 		return
 	}
 
-	// TODO(GeertJohan): sometimes the x and/or y given by glfw is negative or over window size, could this cause an issue?
-	// spew.Dump(event)
 	event := embedder.PointerEvent{
 		Phase:     phase,
 		X:         x * m.pixelsPerScreenCoordinate,
@@ -66,6 +64,15 @@ func (m *windowManager) sendPointerEvent(window *glfw.Window, phase embedder.Poi
 	flutterEnginePointer := *(*uintptr)(window.GetUserPointer())
 	flutterEngine := (*embedder.FlutterEngine)(unsafe.Pointer(flutterEnginePointer))
 
+	// Always send a pointer event with PhaseMove before an eventual PhaseRemove.
+	// If x/y on the last move doesn't equal x/y on the PhaseRemove, the remove
+	// is canceled in Flutter.
+	if phase == embedder.PointerPhaseRemove {
+		event.Phase = embedder.PointerPhaseHover
+		flutterEngine.SendPointerEvent(event)
+		event.Phase = embedder.PointerPhaseRemove
+	}
+
 	flutterEngine.SendPointerEvent(event)
 
 	if phase == embedder.PointerPhaseAdd {