context: // 
  // MenuButton.cs
  // 
  // Author:
  //   Michael Hutchinson <mhutchinson@novell.com>
  // 
  // Copyright (C) 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 Gtk;
  
  using MonoDevelop.Components.AtkCocoaHelper;
  
  namespace MonoDevelop.Components
  {
  	
  	
  	[System.ComponentModel.Category("MonoDevelop.Components")]
  	[System.ComponentModel.ToolboxItem(true)]
  	public class MenuButton : Button
  	{
  		MenuCreator creator;
  		ContextMenuCreator contextMenuCreator;
  		Label label;
  		ImageView image;
  		Arrow arrow;
  		bool isOpen;
  		
  		public MenuButton ()
  			: base ()
  		{
  			Accessible.SetRole (AtkCocoa.Roles.AXMenuButton);
  
  			HBox box = new HBox ();
  			box.Spacing = 6;
  			Add (box);
  			
  			image = new ImageView ();
  			image.Accessible.Role = Atk.Role.Filler;
  			image.NoShowAll = true;
  			box.PackStart (image, false, false, 0);
  			label = new Label ();
  			label.NoShowAll = true;
  			label.Accessible.SetShouldIgnore (true);
  
  			box.PackStart (label, false, false, 0);
  			ArrowType = Gtk.ArrowType.Down;
  			base.Label = null;
  		}
  		
  		protected MenuButton (IntPtr raw)
  			: base (raw)
  		{
  			
  		}
  
  		[Obsolete ("Use ContextMenuRequested")]
  		public MenuCreator MenuCreator {
  			get { return creator; }
  			set { creator = value; }
  		}
  
  		public ContextMenuCreator ContextMenuRequested {
  			get { return contextMenuCreator; }
  			set { contextMenuCreator = value; }
  		}
  
  		ReliefStyle MenuOpened ()
  		{
  			isOpen = true;
  			//make sure the button looks depressed
  			ReliefStyle oldRelief = this.Relief;
  			this.Relief = ReliefStyle.Normal;
  			return oldRelief;
  		}
  
  		void MenuClosed (ReliefStyle oldRelief)
  		{
  			this.Relief = oldRelief;
  			isOpen = false;
  			this.State = StateType.Normal;
  		}
  
  		protected override void OnClicked ()
  		{
  			base.OnClicked ();
  			if (contextMenuCreator != null) {
  				ContextMenu menu = contextMenuCreator (this);
  				var oldRelief = MenuOpened ();
  
  				Gdk.Rectangle rect = this.Allocation;
  
  				this.GrabFocus ();
  				// Offset the menu by the height of the rect
  				menu.Show (this, 0, rect.Height, () => MenuClosed (oldRelief)); 
  				return;
  			}
  
  			if (creator != null) {
  				Menu menu = creator (this);
  				
  				if (menu != null) {
  					var oldRelief = MenuOpened ();
  
  					//clean up after the menu's done
  					menu.Hidden += delegate {
  						MenuClosed (oldRelief);
  						
  						//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, 0, Gtk.Global.CurrentEventTime);
  				}
  			}
  			
  		}
  		
  		protected override void OnStateChanged(StateType previous_state)
  		{
  			base.OnStateChanged (previous_state);
  			
  			//while the menu's open, make sure the button looks depressed
  			if (isOpen && this.State != StateType.Active)
  				this.State = StateType.Active;
  		}
  		
  		void PositionFunc (Menu mn, out int x, out int y, out bool push_in)
  		{
  			this.GdkWindow.GetOrigin (out x, out y);
  			Gdk.Rectangle rect = this.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 > this.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;
  		}
  		
  		public ArrowType? ArrowType {
  			get { return arrow == null? (Gtk.ArrowType?) null : arrow.ArrowType; }
  			set {
  				if (value == null) {
  					if (arrow != null) {
  						((HBox)arrow.Parent).Remove (arrow);
  						arrow.Destroy ();
  						arrow = null;
  					}
  				} else {
  					if (arrow == null ) {
  						arrow = new Arrow (Gtk.ArrowType.Down, ShadowType.Out);
  						arrow.Accessible.Role = Atk.Role.Filler;
  						arrow.Show ();
  						((HBox)label.Parent).PackEnd (arrow, false, false, 0);
  					}
  					arrow.ArrowType = value.Value;
  				}
  			}
  		}
  		
  		protected override void OnDestroyed ()
  		{
  			creator = null;
  			contextMenuCreator = null;
  
  			base.OnDestroyed ();
  		}
  
  		public new string Label {
  			get { return label.Text; }
  			set {
  				label.Text = value;
  				label.Visible = !string.IsNullOrEmpty (value);
  
  				Accessible.Name = value;
  			}
  		}
  		
  		public new bool UseUnderline {
  			get { return label.UseUnderline; }
  			set { label.UseUnderline = value; }
  		}
  		
  		public string StockImage {
  			set {
  				image.SetIcon (value, IconSize.Button);
  				image.Show ();
  			}
  		}
  		
  		public bool UseMarkup
  		{
  			get { return label.UseMarkup; }
  			set { label.UseMarkup = value; }
  		}
  		
  		public string Markup {
  
gt: 			set { label.Markup = value; }