Add WindowMode Option for bordreless and borderless fullscreen windows.

Author: GeertJohan

application.go

@@ -64,10 +64,30 @@ func (a *Application) Run() error {
 	}
 	defer glfw.Terminate()
 
-	a.window, err = glfw.CreateWindow(a.config.windowInitialDimensions.x, a.config.windowInitialDimensions.y, "Loading..", nil, nil)
+	var monitor *glfw.Monitor
+	switch a.config.windowMode {
+	case WindowModeDefault:
+		// nothing
+	case WindowModeBorderless:
+		glfw.WindowHint(glfw.Decorated, glfw.False)
+	case WindowModeBorderlessFullscreen:
+		monitor = glfw.GetPrimaryMonitor()
+		mode := monitor.GetVideoMode()
+		a.config.windowInitialDimensions.x = mode.Width
+		a.config.windowInitialDimensions.y = mode.Height
+		glfw.WindowHint(glfw.RedBits, mode.RedBits)
+		glfw.WindowHint(glfw.GreenBits, mode.GreenBits)
+		glfw.WindowHint(glfw.BlueBits, mode.BlueBits)
+		glfw.WindowHint(glfw.RefreshRate, mode.RefreshRate)
+	default:
+		return errors.Errorf("invalid window mode %T", a.config.windowMode)
+	}
+
+	a.window, err = glfw.CreateWindow(a.config.windowInitialDimensions.x, a.config.windowInitialDimensions.y, "Loading..", monitor, nil)
 	if err != nil {
 		return errors.Wrap(err, "creating glfw window")
 	}
+	glfw.DefaultWindowHints()
 	defer a.window.Destroy()
 
 	if a.config.windowIconProvider != nil {

option.go

@@ -16,6 +16,7 @@ type config struct {
 	windowInitializerDeprecated func(*glfw.Window) error
 	windowIconProvider          func() ([]image.Image, error)
 	windowInitialDimensions     windowDimensions
+	windowMode                  windowMode
 
 	forcePixelRatio float64
 	keyboardLayout  KeyboardShortcuts
@@ -36,6 +37,7 @@ var defaultApplicationConfig = config{
 		y: 600,
 	},
 	keyboardLayout: KeyboardQwertyLayout,
+	windowMode:     WindowModeDefault,
 }
 
 // Option for Application

window.go

@@ -0,0 +1,27 @@
+package flutter
+
+// windowMode determines the kind of window mode to use for new windows.
+type windowMode int
+
+const (
+	// WindowModeDefault is the default window mode. Windows are created with
+	// borders and close/minimize buttons.
+	WindowModeDefault windowMode = iota
+	// WindowModeBorderless removes decorations such as borders and
+	// close/minimize buttons from the window.
+	WindowModeBorderless
+	// WindowModeBorderlessFullscreen starts the application in borderless
+	// fullscreen mode. Currently, only fullscreen on the primary monitor is
+	// supported. This option overrides WindowInitialDimensions. Note that on
+	// some systems a fullscreen window is very hard to close. Make sure your
+	// Flutter application has a close button and use PopBehaviorIconify to
+	// minimize or PopBehaviorClose to close the application.
+	WindowModeBorderlessFullscreen
+)
+
+// WindowMode sets the window mode on the application.
+func WindowMode(w windowMode) Option {
+	return func(c *config) {
+		c.windowMode = w
+	}
+}