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Viewing changes to external/xwt/Xwt.Gtk/Xwt.GtkBackend/MenuButtonBackend.cs

  • Committer: Package Import Robot
  • Author(s): Jo Shields
  • Date: 2013-05-12 09:46:03 UTC
  • mto: This revision was merged to the branch mainline in revision 29.
  • Revision ID: package-import@ubuntu.com-20130512094603-mad323bzcxvmcam0
Tags: upstream-4.0.5+dfsg
Import upstream version 4.0.5+dfsg

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external/xwt/Xwt.Gtk/Xwt.GtkBackend/MenuButtonBackend.cs
 
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// 
 
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// MenuButtonBackend.cs
 
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//  
 
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// Author:
 
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//       Lluis Sanchez <lluis@xamarin.com>
 
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//       Michael Hutchinson <mhutch@xamarin.com>
 
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// 
 
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// Copyright (c) 2011 Xamarin Inc
 
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// 
 
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// Permission is hereby granted, free of charge, to any person obtaining a copy
 
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// of this software and associated documentation files (the "Software"), to deal
 
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// in the Software without restriction, including without limitation the rights
 
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 
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// copies of the Software, and to permit persons to whom the Software is
 
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// furnished to do so, subject to the following conditions:
 
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// 
 
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// The above copyright notice and this permission notice shall be included in
 
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// all copies or substantial portions of the Software.
 
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// 
 
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 
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// THE SOFTWARE.
 
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using System;
 
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using Xwt.Backends;
 
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using Xwt.Engine;
 
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namespace Xwt.GtkBackend
 
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{
 
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        public class MenuButtonBackend: ButtonBackend, IMenuButtonBackend
 
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        {
 
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                bool isOpen;
 
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                public MenuButtonBackend ()
 
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                {
 
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                }
 
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                public override void Initialize ()
 
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                {
 
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                        base.Initialize ();
 
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                        Widget.ButtonPressEvent += HandleClicked;
 
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                        ((Gtk.Widget)Widget).StateChanged += HandleStateChanged;
 
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                }
 
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                new IMenuButtonEventSink EventSink {
 
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                        get { return (IMenuButtonEventSink)base.EventSink; }
 
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                }
 
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                [GLib.ConnectBefore]
 
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                void HandleClicked (object sender, Gtk.ButtonPressEventArgs e)
 
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                {
 
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                        if (e.Event.Button != 1)
 
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                                return;
 
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                        Gtk.Menu menu = CreateMenu ();
 
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                        if (menu != null) {
 
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                                isOpen = true;
 
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                                //make sure the button looks depressed
 
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                                Gtk.ReliefStyle oldRelief = Widget.Relief;
 
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                                Widget.Relief = Gtk.ReliefStyle.Normal;
 
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                                //clean up after the menu's done
 
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                                menu.Hidden += delegate {
 
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                                        Widget.Relief = oldRelief ;
 
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                                        isOpen = false;
 
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                                        ((Gtk.Widget)Widget).State = Gtk.StateType.Normal;
 
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                                        //FIXME: for some reason the menu's children don't get activated if we destroy 
 
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                                        //directly here, so use a timeout to delay it
 
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                                        GLib.Timeout.Add (100, delegate {
 
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                                                //menu.Destroy ();
 
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                                                return false;
 
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                                        });
 
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                                };
 
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                                menu.Popup (null, null, PositionFunc, 1, Gtk.Global.CurrentEventTime);
 
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                        }
 
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                }
 
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                void HandleStateChanged (object o, Gtk.StateChangedArgs args)
 
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                {
 
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                        Gtk.Widget w = (Gtk.Widget)Widget;
 
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                        //while the menu's open, make sure the button looks depressed
 
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                        if (isOpen && w.State != Gtk.StateType.Active)
 
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                                w.State = Gtk.StateType.Active;
 
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                }
 
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                void PositionFunc (Gtk.Menu mn, out int x, out int y, out bool push_in)
 
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                {
 
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                        Gtk.Widget w = (Gtk.Widget)Widget;
 
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                        w.GdkWindow.GetOrigin (out x, out y);
 
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                        Gdk.Rectangle rect = w.Allocation;
 
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                        x += rect.X;
 
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                        y += rect.Y + rect.Height;
 
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                        //if the menu would be off the bottom of the screen, "drop" it upwards
 
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                        if (y + mn.Requisition.Height > w.Screen.Height) {
 
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                                y -= mn.Requisition.Height;
 
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                                y -= rect.Height;
 
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                        }
 
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                        //let GTK reposition the button if it still doesn't fit on the screen
 
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                        push_in = true;
 
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                }
 
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                Gtk.Menu CreateMenu ()
 
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                {
 
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                        MenuBackend m = null;
 
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                        Toolkit.Invoke (delegate {
 
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                                m = (MenuBackend) EventSink.OnCreateMenu ();
 
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                        });
 
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                        return m != null ? m.Menu : null;
 
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                }
 
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        }
 
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}
 
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