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ComplexMenuItem.cs

//
// ComplexMenuItem.cs
//
// Author:
//   Aaron Bockover <abockover@novell.com>
//   Gabriel Burt <gburt@novell.com>
//
// Copyright (C) 2007 Novell, 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 Gtk;

namespace FSpot.Widgets
{
      public class ComplexMenuItem : MenuItem
      {
            private bool is_selected = false;

            public event EventHandler Changed;
            public void OnChanged (object o, EventArgs e)
            {
                  EventHandler handler = Changed;
                  if (handler != null)
                        handler (o, e);
            }

            public ComplexMenuItem() : base()
            {
            }

            // Override OnAdded and OnRemoved so we can work with Gtk.Action/Gtk.UIManager
            // which otherwise would try to replace our child with a Label.
            private bool first_add = true;
            protected override void OnAdded (Widget widget)
            {
                  if (first_add) {
                        first_add = false;
                        base.OnAdded (widget);
                  }
            }

            protected override void OnRemoved (Widget widget)
            {
            }

            protected override void OnSelected()
            {
                  base.OnSelected();
                  is_selected = true;
            }

            protected override void OnDeselected()
            {
                  base.OnDeselected();
                  is_selected = false;
            }

            protected override void OnParentSet(Widget previous_parent)
            {
                  if(previous_parent != null) {
                        previous_parent.KeyPressEvent -= OnKeyPressEventProxy;
                  }

                  if(Parent != null) {
                        Parent.KeyPressEvent += OnKeyPressEventProxy;
                  }
            }

            [GLib.ConnectBefore]
            private void OnKeyPressEventProxy(object o, KeyPressEventArgs args)
            {
                  if(!IsSelected) {
                        return;
                  }

                  switch(args.Event.Key) {
                  case Gdk.Key.Up:
                  case Gdk.Key.Down:
                  case Gdk.Key.Escape:
                        return;
                  }

                  args.RetVal = OnKeyPressEvent(args.Event);
            }

            protected override bool OnKeyPressEvent(Gdk.EventKey evnt)
            {
                  return false;
            }

            protected bool IsSelected {
                  get { return is_selected; }
            }
      }
}

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