[Gtk-sharp-list] Fwd: Dragging Floating windows

[Adam Tauno Williams]

> I sent the e-mail below a couple weeks ago and haven't gotten any
> response. I'm not sure if it just didn't go through or what the deal
> is. Anyway, if anyone has any idea how to help it would be
> appreciated, otherwise some direction as to where else to go for help
> would be great.

It went through, I saw it.  There just wasn't a response [and your using
gmail with besides being crap and non-standards compliant in 1,000 other
ways also prevents you from seeing your own posts to mail lists.  I
think they consider that a feature.]

Sorry I can't give you any advice.  I haven't gotten to DnD in my own
Gtk# application <http://code.google.com/p/consonance/> yet.  Maybe in
the next couple weeks.

> Hello All-
> I'm having some trouble with dragging a floating, decoration-less
> window around the screen. I have written a small (tried to keep it
> under 100 lines but failed) app that demonstrates the problem.
> The main window simply contains a button. When the user clicks on the
> button, the button reparents itself to a floating window and the user
> can then drag the window around the screen. The problem is that, after
> the user clicks the button but BEFORE they let go of the mouse button,
> the dragging doesn't seem to behave quite right. If the mouse is moved
> slowly enough, it works fine, but at a certain speed the floating
> window will stop tracking it. The strange thing is that if the user
> lets go and clicks on the button again, the dragging will work
> perfectly, no matter what the speed. It basically just doesn't seem to
> be receiving the mouse events properly after the reparent.
> I tried looking through the C source for HandleBox, but couldn't find
> what makes it not behave this way. My source code is attached. Any
> help would be greatly appreciated.
> 
> Thanks.
> 
> -Andy
> 
> 
> 
> 
> 
> using System;
> 
> 
> 
> namespace FloatDraggingTest
> 
> {
> 
> 	/// <summary>
> 
> 	/// Main window.
> 
> 	/// </summary>
> 
> 	class MainWindow : Gtk.Window
> 
> 	{
> 
> 		/// <summary>
> 
> 		/// Application entry point.
> 
> 		/// </summary>
> 
> 		public static void Main(string[] args)
> 
> 		{
> 
> 			Gtk.Application.Init();
> 
> 			MainWindow win = new MainWindow();
> 
> 			win.ShowAll();
> 
> 			Gtk.Application.Run();
> 
> 		}
> 
> 
> 
> 
> 
> 		/// <summary>
> 
> 		/// Main window default constructor.
> 
> 		/// </summary>
> 
> 		public MainWindow()
> 
> 			: base(Gtk.WindowType.Toplevel)
> 
> 		{
> 
> 			floatWidget = new FloatWidget("Click Me");
> 
> 			Add(floatWidget);
> 
> 
> 
> 			DeleteEvent += OnDeleteEvent;
> 
> 		}
> 
> 
> 
> 		/// <summary>
> 
> 		/// Called when the window is deleted, stops the application.
> 
> 		/// </summary>
> 
> 		/// <param name="o"></param>
> 
> 		/// <param name="args"></param>
> 
> 		void OnDeleteEvent(object o, Gtk.DeleteEventArgs args)
> 
> 		{
> 
> 			Gtk.Application.Quit();
> 
> 		}
> 
> 
> 
> 
> 
> 		private FloatWidget floatWidget;
> 
> 
> 
> 	}
> 
> 
> 
> 
> 
> 	/// <summary>
> 
> 	/// A widget that you can grab and drag around.
> 
> 	/// </summary>
> 
> 	class FloatWidget : Gtk.Button
> 
> 	{
> 
> 
> 
> 		/// <summary>
> 
> 		/// Default constructor.
> 
> 		/// </summary>
> 
> 		/// <param name="text"> Text to display on the widget.</param>
> 
> 		public FloatWidget(string text)
> 
> 			: base(new Gtk.Label(text))
> 
> 		{
> 
> 			// create the float window
> 
> 			floatWindow = new Gtk.Window(Gtk.WindowType.Toplevel);
> 
> 			floatWindow.Decorated = false;
> 
> 
> 
> 			AddEvents((int)Gdk.EventMask.AllEventsMask); // add all events
> 
> 		}
> 
> 
> 
> 		private Gtk.Window floatWindow;
> 
> 
> 
> 		private bool grabbed = false;
> 
> 
> 
> 		private Gdk.Point grabPoint;
> 
> 
> 
> 		protected override bool OnButtonPressEvent(Gdk.EventButton evnt)
> 
> 		{
> 
> 			grabbed = true;
> 
> 			int grabX, grabY;
> 
> 			GetPointer(out grabX, out grabY);
> 
> 			grabPoint = new Gdk.Point(grabX, grabY);
> 
> 			return true;
> 
> 		}
> 
> 
> 
> 		protected override bool OnButtonReleaseEvent(Gdk.EventButton evnt)
> 
> 		{
> 
> 			grabbed = false;
> 
> 			return true;
> 
> 		}
> 
> 
> 
> 		protected override bool OnMotionNotifyEvent(Gdk.EventMotion evnt)
> 
> 		{
> 
> 			if (grabbed) // the window has been grabbed
> 
> 			{
> 
> 				if (Parent != floatWindow) // it isn't floating yet, float it
> 
> 				{
> 
> 					Reparent(floatWindow);
> 
> 					floatWindow.ShowAll();
> 
> 				}
> 
> 				MoveToCursor();
> 
> 			}
> 
> 
> 
> 			return true;
> 
> 		}
> 
> 
> 
> 		protected override bool OnLeaveNotifyEvent(Gdk.EventCrossing evnt)
> 
> 		{
> 
> 			if (grabbed)
> 
> 				MoveToCursor();
> 
> 			return true;
> 
> 		}
> 
> 
> 
> 		/// <summary>
> 
> 		/// Moves the floating window to the cursor.
> 
> 		/// </summary>
> 
> 		protected void MoveToCursor()
> 
> 		{
> 
> 			int cursorX, cursorY, windowX, windowY;
> 
> 			GetPointer(out cursorX, out cursorY);
> 
> 			GdkWindow.GetPosition(out windowX, out windowY);
> 
> 			floatWindow.GdkWindow.Move(windowX + cursorX - grabPoint.X, windowY
> + cursorY - grabPoint.Y);
> 
> 			Display.Sync();
> 
> 		}
> 
> 
> 
> 	}
> 
> 
> 
> 
> 
> }
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