How to capture mouse events in C# MonoMac

Question

First off all, my goal is to create pragmatically (no controllers or such things, just single class) borderless NSWindow. In this window I'd like to track mouse events, like: Mouse down, mouse move. As simple as that.

I need to do this in C# using Xamarin Studio in Monomac project. My window is super-simple

public class MyWindow : NSWindow
{
    public MyWindow()
        :base(new RectangleF (0, 0, 100, 100), 
            NSWindowStyle.Closable | NSWindowStyle.Resizable | NSWindowStyle.Titled, NSBackingStore.Buffered, 
            false)
    {
        this.StyleMask = NSWindowStyle.Borderless;
        this.MakeKeyAndOrderFront( null );
    }
}

Now, as far as I know I should add NSView to this NSWindow class with declared events. So I created NSView class:

public class MouseTracking : NSView
{
    public NSTrackingArea tracking;

    public override bool AcceptsFirstResponder ()
    {
        return true;
    }

    public override void DrawRect(RectangleF dirtyRect)
    {
        base.DrawRect(dirtyRect);
        var context = NSGraphicsContext.CurrentContext.GraphicsPort;
        var rectangle = new RectangleF (0,0, this.Frame.Width, this.Frame.Height);
        NSColor.Blue.Set ();
        context.FillRect (rectangle);
    }

    public override void UpdateTrackingAreas()
    {
        if (tracking != null)
        {
            this.RemoveTrackingArea(tracking);
            tracking.Release();
        }
        tracking = new NSTrackingArea(this.Frame,NSTrackingAreaOptions.MouseEnteredAndExited | NSTrackingAreaOptions.ActiveAlways ,this, null);
        this.AddTrackingArea(tracking);
    }

    public override void MouseMoved(NSEvent theEvent)
    {
        Console.WriteLine("MouseMoved");
    }

    public override void MouseExited(NSEvent theEvent)
    {
        Console.WriteLine("MouseExitedTest");
    }
}

My question is how to add MouseTracking nsview to MyWindow and make those mouse events available? I've tried in MyWindow constructor do:

        MouseTracking tracking = new MouseTracking ();
        this.ContentView.AddSubview (tracking);

but, that doesn't work.. I just want to do this (two lines in WinForms):

this.MouseDown += new System.Windows.Forms.MouseEventHandler(this.panel1_MouseDown);

private void panel1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e) { }

Thanks, for help

Answer 1

You don’t need DrawRect to capture mouse events. You need contructors:

    public MouseTracking(NSCoder coder)
        :base(coder)
    {
    }

    public MouseTracking(RectangleF frameRect)
        :base(frameRect)
    {
    }

You could also need (maybe you don’t know this yet) to override this flag:

    public override bool AcceptsFirstMouse (NSEvent theEvent)
    {
        return true;
    }

and yes, you add MouseTracking to MyWindow exactly like you wrote, so:

    this.ContentView.AddSubview (tracking);