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//
// MenuButtonBackend.cs
//
// Author:
// Lluis Sanchez <lluis@xamarin.com>
// Michael Hutchinson <mhutch@xamarin.com>
//
// Copyright (c) 2011 Xamarin Inc
//
// 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 Xwt.Backends;
namespace Xwt.GtkBackend
{
public class MenuButtonBackend: ButtonBackend, IMenuButtonBackend
{
bool isOpen;
public MenuButtonBackend ()
{
}
public override void Initialize ()
{
base.Initialize ();
Widget.ButtonPressEvent += HandlePressed;
Widget.Clicked += HandleClicked;
Widget.StateChanged += HandleStateChanged;
}
new IMenuButtonEventSink EventSink {
get { return (IMenuButtonEventSink)base.EventSink; }
}
[GLib.ConnectBefore]
void HandlePressed (object sender, Gtk.ButtonPressEventArgs e)
{
if (e.Event.Button != 1)
return;
ShowMenu ();
}
[GLib.ConnectBefore]
void HandleClicked (object sender, EventArgs e)
{
if (!isOpen)
ShowMenu ();
}
void ShowMenu ()
{
Gtk.Menu menu = CreateMenu ();
if (menu != null) {
isOpen = true;
//make sure the button looks depressed
Gtk.ReliefStyle oldRelief = Widget.Relief;
Widget.Relief = Gtk.ReliefStyle.Normal;
Widget.SetStateActive();
//clean up after the menu's done
menu.Hidden += delegate {
Widget.Relief = oldRelief ;
isOpen = false;
Widget.SetStateNormal ();
//FIXME: for some reason the menu's children don't get activated if we destroy
//directly here, so use a timeout to delay it
GLib.Timeout.Add (100, delegate {
//menu.Destroy ();
return false;
});
};
menu.Popup (null, null, PositionFunc, 1, Gtk.Global.CurrentEventTime);
}
}
void HandleStateChanged (object o, Gtk.StateChangedArgs args)
{
//while the menu's open, make sure the button looks depressed
if (isOpen && Widget.State != Gtk.StateType.Active)
Widget.SetStateActive ();
}
void PositionFunc (Gtk.Menu mn, out int x, out int y, out bool push_in)
{
Gtk.Widget w = (Gtk.Widget)Widget;
w.GdkWindow.GetOrigin (out x, out y);
Gdk.Rectangle rect = w.Allocation;
x += rect.X;
y += rect.Y + rect.Height;
//if the menu would be off the bottom of the screen, "drop" it upwards
if (y + mn.Requisition.Height > w.Screen.Height) {
y -= mn.Requisition.Height;
y -= rect.Height;
}
//let GTK reposition the button if it still doesn't fit on the screen
push_in = true;
}
Gtk.Menu CreateMenu ()
{
MenuBackend m = null;
ApplicationContext.InvokeUserCode (delegate {
m = (MenuBackend) EventSink.OnCreateMenu ();
});
return m != null ? m.Menu : null;
}
}
}
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