Subclass NSSplitView for subclass macos example (#205)

Author: catilac

macos/_examples/subclass/main.go

@@ -20,13 +20,32 @@ func (v TestView) keyDown(event appkit.Event) {
 	log.Println("Keydown:", v.Class().Name(), event.Class().Name())
 }
 
+func (v TestView) dividerThickness() float64 {
+	return 10.0
+}
+
+func (v TestView) dividerColor() appkit.Color {
+	return appkit.Color_BlackColor()
+}
+
 func main() {
 	log.Println("Program started.")
 
-	c := objc.AllocateClass(objc.GetClass("NSView"), "TestView", 0)
-	objc.AddMethod(c, objc.Sel("acceptsFirstResponder"), (TestView).acceptsFirstResponder)
-	objc.AddMethod(c, objc.Sel("keyDown:"), (TestView).keyDown)
-	objc.RegisterClass(c)
+	// Create a SplitView subclass using AllocateClass
+	SplitViewClass := objc.AllocateClass(objc.GetClass("NSSplitView"), "TestSplitView", 0)
+	objc.AddMethod(SplitViewClass, objc.Sel("acceptsFirstResponder"), (TestView).acceptsFirstResponder)
+	objc.AddMethod(SplitViewClass, objc.Sel("keyDown:"), (TestView).keyDown)
+
+	// Implement these methods for the dividerThickness and dividerColor properties on the subclass
+	objc.AddMethod(SplitViewClass, objc.Sel("dividerThickness"), (TestView).dividerThickness)
+	objc.AddMethod(SplitViewClass, objc.Sel("dividerColor"), (TestView).dividerColor)
+
+	objc.RegisterClass(SplitViewClass)
+
+	ViewClass := objc.AllocateClass(objc.GetClass("NSView"), "TestView", 0)
+	objc.AddMethod(ViewClass, objc.Sel("acceptsFirstResponder"), (TestView).acceptsFirstResponder)
+	objc.AddMethod(ViewClass, objc.Sel("keyDown:"), (TestView).keyDown)
+	objc.RegisterClass(ViewClass)
 
 	app := appkit.Application_SharedApplication()
 
@@ -45,7 +64,18 @@ func main() {
 		win.SetTitle("Hello world")
 		win.SetLevel(appkit.MainMenuWindowLevel + 2)
 
-		view := appkit.ViewFrom(c.CreateInstance(0).Ptr()).InitWithFrame(frame)
+		view := appkit.SplitViewFrom(SplitViewClass.CreateInstance(0).Ptr()).InitWithFrame(frame)
+		view.SetVertical(true)
+
+		neatView := appkit.ViewFrom(ViewClass.CreateInstance(0).Ptr()).InitWithFrame(rectOf(0, 0, 150, 99))
+		coolView := appkit.ViewFrom(ViewClass.CreateInstance(0).Ptr()).InitWithFrame(rectOf(10, 0, 150, 99))
+		neatView.AddSubview(appkit.NewLabel("NEAT"))
+		coolView.AddSubview(appkit.NewLabel("COOL"))
+
+		// Add subviews
+		view.AddArrangedSubview(neatView)
+		view.AddArrangedSubview(coolView)
+
 		win.SetContentView(view)
 		win.MakeKeyAndOrderFront(nil)