1 files changed, 116 insertions, 0 deletions
diff --git a/main/src/core/MonoDevelop.Ide/MonoDevelop.Components/WindowTransparencyDecorator.cs b/main/src/core/MonoDevelop.Ide/MonoDevelop.Components/WindowTransparencyDecorator.cs
new file mode 100644
index 0000000000..9b8e8526d8
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+++ b/main/src/core/MonoDevelop.Ide/MonoDevelop.Components/WindowTransparencyDecorator.cs
@@ -0,0 +1,116 @@
+//
+// WindowTransparencyDecorator.cs
+//
+// Author:
+//   Michael Hutchinson <mhutch@xamarin.com>
+//
+// Based on code derived from Banshee.Widgets.EllipsizeLabel
+// by Aaron Bockover (aaron@aaronbock.net)
+//
+// Copyright (C) 2005-2008 Novell, Inc (http://www.novell.com)
+// Copyright (C) 2012 Xamarin Inc (http://www.xamarin.com)
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+using System;
+using System.Reflection;
+using System.Runtime.InteropServices;
+
+using Gtk;
+using Gdk;
+
+namespace MonoDevelop.Components
+{
+	public class WindowTransparencyDecorator
+	{
+		Gtk.Window window;
+		bool semiTransparent;
+		bool snooperInstalled;
+		uint snooperID;
+		const double opacity = 0.2;
+
+		WindowTransparencyDecorator (Gtk.Window window)
+		{
+			this.window = window;
+
+			window.Shown += ShownHandler;
+			window.Hidden += HiddenHandler;
+			window.Destroyed += DestroyedHandler;
+		}
+
+		public static WindowTransparencyDecorator Attach (Gtk.Window window)
+		{
+			return new WindowTransparencyDecorator (window);
+		}
+
+		public void Detach ()
+		{
+			if (window == null)
+				return;
+
+			//remove the snooper
+			HiddenHandler (null,  null);
+
+			//annul allreferences between this and the window
+			window.Shown -= ShownHandler;
+			window.Hidden -= HiddenHandler;
+			window.Destroyed -= DestroyedHandler;
+			window = null;
+		}
+
+		void ShownHandler (object sender, EventArgs args)
+		{
+			if (!snooperInstalled)
+				snooperID = Gtk.Key.SnooperInstall (TransparencyKeySnooper);
+			snooperInstalled = true;
+
+			//NOTE: we unset transparency when showing, instead of when hiding
+			//because the latter case triggers a metacity+compositing bug that shows the window again
+			SemiTransparent = false;
+		}
+
+		void HiddenHandler (object sender, EventArgs args)
+		{
+			if (snooperInstalled)
+				Gtk.Key.SnooperRemove (snooperID);
+			snooperInstalled = false;
+		}
+
+		void DestroyedHandler (object sender, EventArgs args)
+		{
+			Detach ();
+		}
+
+		int TransparencyKeySnooper (Gtk.Widget widget, EventKey evnt)
+		{
+			if (evnt != null && evnt.Key == Gdk.Key.Control_L || evnt.Key == Gdk.Key.Control_R)
+				SemiTransparent = (evnt.Type == Gdk.EventType.KeyPress);
+			return 0; //FALSE
+		}
+
+		bool SemiTransparent {
+			set {
+				if (semiTransparent != value) {
+					semiTransparent = value;
+					window.Opacity = semiTransparent? opacity : 1.0;
+				}
+			}
+		}
+	}
+}