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//
// 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;
}
}
}
}
}
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