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//
// WindowTransparencyDecorator.cs
//
// Author:
// Michael Hutchinson <mhutchinson@novell.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)
//
// 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;
namespace MonoDevelop.Components
{
public class WindowTransparencyDecorator
{
Gtk.Window window;
bool semiTransparent;
bool snooperInstalled;
uint snooperID;
const double opacity = 0.2;
Delegate snoopFunc;
WindowTransparencyDecorator (Gtk.Window window)
{
this.window = window;
//HACK: Workaround for GTK# crasher bug where GC collects internal wrapper delegates
snoopFunc = TryBindGtkInternals (this);
if (snoopFunc != null) {
window.Shown += ShownHandler;
window.Hidden += HiddenHandler;
window.Destroyed += DestroyedHandler;
} else {
snoopFunc = null;
window = null;
}
}
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;
snoopFunc = null;
window = null;
}
void ShownHandler (object sender, EventArgs args)
{
if (!snooperInstalled)
snooperID = InstallSnooper (snoopFunc);
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)
RemoveSnooper (snooperID);
snooperInstalled = false;
}
void DestroyedHandler (object sender, EventArgs args)
{
Detach ();
}
#pragma warning disable 0169
int TransparencyKeySnooper (IntPtr widget, IntPtr rawEvnt, IntPtr data)
{
if (rawEvnt != IntPtr.Zero) {
Gdk.EventKey evnt = new Gdk.EventKey (rawEvnt);
if (evnt != null && evnt.Key == Gdk.Key.Control_L || evnt.Key == Gdk.Key.Control_R)
SemiTransparent = (evnt.Type == Gdk.EventType.KeyPress);
}
return 0; //gboolean FALSE
}
#pragma warning restore 0169
bool SemiTransparent {
set {
if (semiTransparent != value) {
semiTransparent = value;
window.Opacity = semiTransparent? opacity : 1.0;
}
}
}
#region Workaround for GTK# crasher bug where GC collects internal wrapper delegates
static WindowTransparencyDecorator ()
{
snooper_install = typeof (Gtk.Key).GetMethod ("gtk_key_snooper_install", BindingFlags.NonPublic | BindingFlags.Static);
snooper_remove = typeof (Gtk.Key).GetMethod ("gtk_key_snooper_remove", BindingFlags.NonPublic | BindingFlags.Static);
}
static MethodInfo snooper_install;
static MethodInfo snooper_remove;
delegate int GtkKeySnoopFunc (IntPtr widget, IntPtr rawEvnt, IntPtr func_data);
static uint InstallSnooper (Delegate del)
{
return (uint) snooper_install.Invoke (null, new object[] { del, IntPtr.Zero} );
}
static void RemoveSnooper (uint id)
{
snooper_remove.Invoke (null, new object[] { id });
}
static bool internalBindingWorks = true;
static bool internalBindingTried = false;
static Delegate TryBindGtkInternals (WindowTransparencyDecorator instance)
{
if (internalBindingTried) {
if (!internalBindingWorks)
return null;
} else {
internalBindingTried = true;
}
try {
Type delType = typeof(Gtk.Widget).Assembly.GetType ("GtkSharp.KeySnoopFuncNative");
System.Reflection.MethodInfo met = typeof (WindowTransparencyDecorator).GetMethod ("TransparencyKeySnooper",
System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
Delegate ret = Delegate.CreateDelegate (delType, instance, met);
if (ret != null)
return ret;
} catch {}
internalBindingWorks = false;
MonoDevelop.Core.LoggingService.LogWarning ("GTK# API has changed, and control-transparency will not be available for popups");
return null;
}
#endregion
}
}
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