/mcs/class/Managed.Windows.Forms/System.Windows.Forms/Control.cs

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// 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.
//
// Copyright (c) 2004-2006 Novell, Inc.
//
// Authors:
//	Peter Bartok		pbartok@novell.com
//
// Partially based on work by:
//	Aleksey Ryabchuk	ryabchuk@yahoo.com
//	Alexandre Pigolkine	pigolkine@gmx.de
//	Dennis Hayes		dennish@raytek.com
//	Jaak Simm		jaaksimm@firm.ee
//	John Sohn		jsohn@columbus.rr.com
//

#undef DebugRecreate
#undef DebugFocus
#undef DebugMessages

using System;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.ComponentModel.Design.Serialization;
using System.Collections;
using System.Diagnostics;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Security;
using System.Threading;

namespace System.Windows.Forms
{
	[ComVisible(true)]
	[ClassInterface (ClassInterfaceType.AutoDispatch)]
	[Designer("System.Windows.Forms.Design.ControlDesigner, " + Consts.AssemblySystem_Design, "System.ComponentModel.Design.IDesigner")]
	[DefaultProperty("Text")]
	[DefaultEvent("Click")]
	[DesignerSerializer("System.Windows.Forms.Design.ControlCodeDomSerializer, " + Consts.AssemblySystem_Design, "System.ComponentModel.Design.Serialization.CodeDomSerializer, " + Consts.AssemblySystem_Design)]
	[ToolboxItemFilter("System.Windows.Forms")]
	public class Control : Component, ISynchronizeInvoke, IWin32Window
		, IBindableComponent, IDropTarget, IBounds
	{
		#region Local Variables

		// Basic
		internal Rectangle		bounds;			// bounding rectangle for control (client area + decorations)
		Rectangle               explicit_bounds; // explicitly set bounds
		internal object			creator_thread;		// thread that created the control
		internal                ControlNativeWindow	window;			// object for native window handle
		private                 IWindowTarget window_target;
		string                  name; // for object naming

		// State
		bool                    is_created; // true if OnCreateControl has been sent
		internal bool		has_focus;		// true if control has focus
		internal bool		is_visible;		// true if control is visible
		internal bool		is_entered;		// is the mouse inside the control?
		internal bool		is_enabled;		// true if control is enabled (usable/not grayed out)
		bool                    is_accessible; // true if the control is visible to accessibility applications
		bool                    is_captured; // tracks if the control has captured the mouse
		internal bool			is_toplevel;		// tracks if the control is a toplevel window
		bool                    is_recreating; // tracks if the handle for the control is being recreated
		bool                    causes_validation; // tracks if validation is executed on changes
		bool                    is_focusing; // tracks if Focus has been called on the control and has not yet finished
		int                     tab_index; // position in tab order of siblings
		bool                    tab_stop; // is the control a tab stop?
		bool                    is_disposed; // has the window already been disposed?
		bool                    is_disposing; // is the window getting disposed?
		Size                    client_size; // size of the client area (window excluding decorations)
		Rectangle               client_rect; // rectangle with the client area (window excluding decorations)
		ControlStyles           control_style; // rather win32-specific, style bits for control
		ImeMode                 ime_mode;
		object                  control_tag; // object that contains data about our control
		internal int			mouse_clicks;		// Counter for mouse clicks
		Cursor                  cursor; // Cursor for the window
		internal bool			allow_drop;		// true if the control accepts droping objects on it   
		Region                  clip_region; // User-specified clip region for the window

		// Visuals
		internal Color			foreground_color;	// foreground color for control
		internal Color			background_color;	// background color for control
		Image                   background_image; // background image for control
		internal Font			font;			// font for control
		string                  text; // window/title text for control
		internal                BorderStyle		border_style;		// Border style of control
		bool                    show_keyboard_cues; // Current keyboard cues 
		internal bool           show_focus_cues; // Current focus cues 
		internal bool		force_double_buffer;	// Always doublebuffer regardless of ControlStyle

		// Layout
		internal enum LayoutType {
			Anchor,
			Dock
		}
		Layout.LayoutEngine layout_engine;
		internal int layout_suspended;
		bool layout_pending; // true if our parent needs to re-layout us
		internal AnchorStyles anchor_style; // anchoring requirements for our control
		internal DockStyle dock_style; // docking requirements for our control
		LayoutType layout_type;
		private bool recalculate_distances = true;  // Delay anchor calculations

		// Please leave the next 2 as internal until DefaultLayout (2.0) is rewritten
		internal int			dist_right; // distance to the right border of the parent
		internal int			dist_bottom; // distance to the bottom border of the parent

		// to be categorized...
		ControlCollection       child_controls; // our children
		Control                 parent; // our parent control
		BindingContext          binding_context;
		RightToLeft             right_to_left; // drawing direction for control
		ContextMenu             context_menu; // Context menu associated with the control
		internal bool		use_compatible_text_rendering;
		private bool		use_wait_cursor;

		//accessibility
		string accessible_name;
		string accessible_description;
		string accessible_default_action;
		AccessibleRole accessible_role = AccessibleRole.Default;
		AccessibleObject accessibility_object; // object that contains accessibility information about our control

		// double buffering
		DoubleBuffer            backbuffer;

		ControlBindingsCollection data_bindings;

		static bool verify_thread_handle;
		Padding padding;
		ImageLayout backgroundimage_layout;
		Size maximum_size;
		Size minimum_size;
		Padding margin;
		private ContextMenuStrip context_menu_strip;
		private bool nested_layout = false;
		Point auto_scroll_offset;
		private AutoSizeMode auto_size_mode;
		private bool suppressing_key_press;

		#endregion	// Local Variables

		#region Private Classes
		// This helper class allows us to dispatch messages to Control.WndProc
		internal class ControlNativeWindow : NativeWindow {
			private Control owner;

			public ControlNativeWindow(Control control) : base() {
				this.owner=control;
			}


			public Control Owner {
				get {
					return owner;
				}
			}

			protected override void OnHandleChange()
			{
				this.owner.WindowTarget.OnHandleChange(this.owner.Handle);
			}

			static internal Control ControlFromHandle(IntPtr hWnd) {
				ControlNativeWindow	window;

				window = (ControlNativeWindow)NativeWindow.FromHandle (hWnd);
				if (window != null) {
					return window.owner;
				}

				return null;
			}

			static internal Control ControlFromChildHandle (IntPtr handle) {
				ControlNativeWindow	window;

				Hwnd hwnd = Hwnd.ObjectFromHandle (handle);
				while (hwnd != null) {
					window = (ControlNativeWindow)NativeWindow.FromHandle (handle);
					if (window != null) {
						return window.owner;
					}
					hwnd = hwnd.Parent;
				}

				return null;
			}

			protected override void WndProc(ref Message m) {
				owner.WindowTarget.OnMessage(ref m);
			}
		}

		private class ControlWindowTarget : IWindowTarget
		{
			private Control control;

			public ControlWindowTarget(Control control)
			{
				this.control = control;
			}

			public void OnHandleChange(IntPtr newHandle) 
			{
			}

			public void OnMessage(ref Message m) 
			{
				control.WndProc(ref m);
			}
		}
		#endregion
		
		#region Public Classes
		[ComVisible(true)]
		public class ControlAccessibleObject : AccessibleObject {
			IntPtr handle;

			#region ControlAccessibleObject Constructors
			public ControlAccessibleObject(Control ownerControl)
				: base (ownerControl)
			{
				if (ownerControl == null)
					throw new ArgumentNullException ("owner");

				handle = ownerControl.Handle;
			}
			#endregion	// ControlAccessibleObject Constructors

			#region ControlAccessibleObject Public Instance Properties
			public override string DefaultAction {
				get {
					return base.DefaultAction;
				}
			}

			public override string Description {
				get {
					return base.Description;
				}
			}

			public IntPtr Handle {
				get {
					return handle;
				}

				set {
					// We don't want to let them set it
				}
			}

			public override string Help {
				get {
					return base.Help;
				}
			}

			public override string KeyboardShortcut {
				get {
					return base.KeyboardShortcut;
				}
			}

			public override string Name {
				get {
					return base.Name;
				}

				set {
					base.Name = value;
				}
			}

			public Control Owner {
				get {
					return base.owner;
				}
			}

			public override AccessibleObject Parent {
				get {
					return base.Parent;
				}
			}


			public override AccessibleRole Role {
				get {
					return base.Role;
				}
			}
			#endregion	// ControlAccessibleObject Public Instance Properties

			#region ControlAccessibleObject Public Instance Methods
			public override int GetHelpTopic (out string fileName)
			{
				return base.GetHelpTopic (out fileName);
			}

			[MonoTODO ("Stub, does nothing")]
			public void NotifyClients (AccessibleEvents accEvent)
			{
			}

			[MonoTODO ("Stub, does nothing")]
			public void NotifyClients (AccessibleEvents accEvent, int childID)
			{
			}

			[MonoTODO ("Stub, does nothing")]
			public void NotifyClients (AccessibleEvents accEvent, int objectID, int childID)
			{
			}

			public override string ToString() {
				return "ControlAccessibleObject: Owner = " + owner.ToString() + ", Text: " + owner.text;
			}

			#endregion	// ControlAccessibleObject Public Instance Methods
		}

		private class DoubleBuffer : IDisposable
		{
			public Region InvalidRegion;
			private Stack real_graphics;
			private object back_buffer;
			private Control parent;
			private bool pending_disposal;
			
			public DoubleBuffer (Control parent) {
				this.parent = parent;
				real_graphics = new Stack ();
				int width = parent.Width;
				int height = parent.Height;

				if (width < 1) width = 1;
				if (height < 1) height = 1;

				XplatUI.CreateOffscreenDrawable (parent.Handle, width, height, out back_buffer);
				Invalidate ();
			}
			
			public void Blit (PaintEventArgs pe) {
				Graphics buffered_graphics;
				buffered_graphics = XplatUI.GetOffscreenGraphics (back_buffer);
				XplatUI.BlitFromOffscreen (parent.Handle, pe.Graphics, back_buffer, buffered_graphics, pe.ClipRectangle);
				buffered_graphics.Dispose ();
			}
			
			public void Start (PaintEventArgs pe) {
				// We need to get the graphics for every paint.
				real_graphics.Push(pe.SetGraphics (XplatUI.GetOffscreenGraphics (back_buffer)));
			}

			public void End (PaintEventArgs pe) {
				Graphics buffered_graphics;
				buffered_graphics = pe.SetGraphics ((Graphics) real_graphics.Pop ());

				if (pending_disposal) 
					Dispose ();
				else {
					XplatUI.BlitFromOffscreen (parent.Handle, pe.Graphics, back_buffer, buffered_graphics, pe.ClipRectangle);
					InvalidRegion.Exclude (pe.ClipRectangle);
				}
				buffered_graphics.Dispose ();
			}
			
			public void Invalidate ()
			{
				if (InvalidRegion != null)
					InvalidRegion.Dispose ();
				InvalidRegion = new Region (parent.ClientRectangle);
			}
			
			public void Dispose () {
				if (real_graphics.Count > 0) {
					pending_disposal = true;
					return;
				}
				
				XplatUI.DestroyOffscreenDrawable (back_buffer);

				if (InvalidRegion != null)
					InvalidRegion.Dispose ();
				InvalidRegion = null;
				back_buffer = null;
				GC.SuppressFinalize (this);
			}

			#region IDisposable Members
			void IDisposable.Dispose () {
				Dispose ();
			}
			#endregion
			
			~DoubleBuffer () {
				Dispose ();
			}
		}

		[ListBindable (false)]
		[ComVisible (false)]
		public class ControlCollection : Layout.ArrangedElementCollection, IList, ICollection, ICloneable, IEnumerable {
			#region ControlCollection Local Variables
			ArrayList impl_list;
			Control [] all_controls;
			Control owner;
			#endregion // ControlCollection Local Variables

			#region ControlCollection Public Constructor
			public ControlCollection (Control owner)
			{
				this.owner = owner;
			}
			#endregion

			#region ControlCollection Public Instance Properties


			public Control Owner {
				get { return this.owner; }
			}
			
			public virtual Control this[string key] {
				get { 
					int index = IndexOfKey (key);
					
					if (index >= 0)
						return this[index];
						
					return null;
				}
			}
			
			new public virtual Control this[int index] {
				get {
					if (index < 0 || index >= list.Count) {
						throw new ArgumentOutOfRangeException("index", index, "ControlCollection does not have that many controls");
					}
					return (Control)list[index];
				}
				
				
			}

			#endregion // ControlCollection Public Instance Properties
			
			#region ControlCollection Instance Methods

			public virtual void Add (Control value)
			{
				if (value == null)
					return;

				Form form_value = value as Form;
				Form form_owner = owner as Form;
				bool owner_permits_toplevels = (owner is MdiClient) || (form_owner != null && form_owner.IsMdiContainer);
				bool child_is_toplevel = value.GetTopLevel();
				bool child_is_mdichild = form_value != null && form_value.IsMdiChild;

				if (child_is_toplevel && !(owner_permits_toplevels && child_is_mdichild))
					throw new ArgumentException("Cannot add a top level control to a control.", "value");
				
				if (child_is_mdichild && form_value.MdiParent != null && form_value.MdiParent != owner && form_value.MdiParent != owner.Parent) {
					throw new ArgumentException ("Form cannot be added to the Controls collection that has a valid MDI parent.", "value");
				}
				
				value.recalculate_distances = true;
				
				if (Contains (value)) {
					owner.PerformLayout();
					return;
				}

				if (value.tab_index == -1) {
					int	end;
					int	index;
					int	use;

					use = 0;
					end = owner.child_controls.Count;
					for (int i = 0; i < end; i++) {
						index = owner.child_controls[i].tab_index;
						if (index >= use) {
							use = index + 1;
						}
					}
					value.tab_index = use;
				}

				if (value.parent != null) {
					value.parent.Controls.Remove(value);
				}

				all_controls = null;
				list.Add (value);

				value.ChangeParent(owner);

				value.InitLayout();

				if (owner.Visible)
					owner.UpdateChildrenZOrder();
				owner.PerformLayout(value, "Parent");
				owner.OnControlAdded(new ControlEventArgs(value));
			}
			
			internal void AddToList (Control c)
			{
				all_controls = null;
				list.Add (c);
			}

			internal virtual void AddImplicit (Control control)
			{
				if (impl_list == null)
					impl_list = new ArrayList ();

				if (AllContains (control)) {
					owner.PerformLayout ();
					return;
				}

				if (control.parent != null) {
					control.parent.Controls.Remove(control);
				}

				all_controls = null;
				impl_list.Add (control);

				control.ChangeParent (owner);
				control.InitLayout ();
				if (owner.Visible)
					owner.UpdateChildrenZOrder ();
				
				// If we are adding a new control that isn't
				// visible, don't trigger a layout
				if (control.VisibleInternal)
					owner.PerformLayout (control, "Parent");
			}
			[DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
			public virtual void AddRange (Control[] controls)
			{
				if (controls == null)
					throw new ArgumentNullException ("controls");

				owner.SuspendLayout ();

				try {
					for (int i = 0; i < controls.Length; i++) 
						Add (controls[i]);
				} finally {
					owner.ResumeLayout ();
				}
			}

			internal virtual void AddRangeImplicit (Control [] controls)
			{
				if (controls == null)
					throw new ArgumentNullException ("controls");

				owner.SuspendLayout ();

				try {
					for (int i = 0; i < controls.Length; i++)
						AddImplicit (controls [i]);
				} finally {
					owner.ResumeLayout (false);
				}
			}

			new 
			public virtual void Clear ()
			{
				all_controls = null;

				// MS sends remove events in reverse order
				while (list.Count > 0) {
					Remove((Control)list[list.Count - 1]);
				}
			}

			internal virtual void ClearImplicit ()
			{
				if (impl_list == null)
					return;
				all_controls = null;
				impl_list.Clear ();
			}

			public bool Contains (Control control)
			{
				return list.Contains (control);
			}

			internal bool ImplicitContains (Control value) {
				if (impl_list == null)
					return false;

				return impl_list.Contains (value);
			}

			internal bool AllContains (Control value) {
				return Contains (value) || ImplicitContains (value);
			}


			public virtual bool ContainsKey (string key)
			{
				return IndexOfKey (key) >= 0;
			}


			// LAMESPEC: MSDN says AE, MS implementation throws ANE
			public Control[] Find (string key, bool searchAllChildren)
			{
				if (string.IsNullOrEmpty (key))
					throw new ArgumentNullException ("key");
					
				ArrayList al = new ArrayList ();
				
				foreach (Control c in list) {
					if (c.Name.Equals (key, StringComparison.CurrentCultureIgnoreCase))
						al.Add (c);
						
					if (searchAllChildren)
						al.AddRange (c.Controls.Find (key, true));
				}
				
				return (Control[])al.ToArray (typeof (Control));
			}

			public int GetChildIndex(Control child) {
				return GetChildIndex(child, false);
			}

			public virtual int GetChildIndex(Control child, bool throwException) {
				int index;

				index=list.IndexOf(child);

				if (index==-1 && throwException) {
					throw new ArgumentException("Not a child control", "child");
				}
				return index;
			}

			public override IEnumerator
			GetEnumerator () {
				return new ControlCollectionEnumerator (list);
			}

			internal IEnumerator GetAllEnumerator () {
				Control [] res = GetAllControls ();
				return res.GetEnumerator ();
			}

			internal ArrayList ImplicitControls {
				get { return impl_list; }
			}
			
			internal Control [] GetAllControls () {
				if (all_controls != null)
					return all_controls;

				if (impl_list == null) {
					all_controls = (Control []) list.ToArray (typeof (Control));
					return all_controls;
				}
				
				all_controls = new Control [list.Count + impl_list.Count];
				impl_list.CopyTo (all_controls);
				list.CopyTo (all_controls, impl_list.Count);

				return all_controls;
			}

			public int IndexOf (Control control)
			{
				return list.IndexOf (control);
			}

			public virtual int IndexOfKey (string key)
			{
				if (string.IsNullOrEmpty (key))
					return -1;
					
				for (int i = 0; i < list.Count; i++)
					if (((Control)list[i]).Name.Equals (key, StringComparison.CurrentCultureIgnoreCase))
						return i;
						
				return -1;
			}

			public virtual void Remove (Control value)
			{
				if (value == null)
					return;

				all_controls = null;
				list.Remove(value);

				owner.PerformLayout(value, "Parent");
				owner.OnControlRemoved(new ControlEventArgs(value));

				ContainerControl container = owner.InternalGetContainerControl ();
				if (container != null) { 
					// Inform any container controls about the loss of a child control
					// so that they can update their active control
					container.ChildControlRemoved (value);
				}

				value.ChangeParent(null);

				owner.UpdateChildrenZOrder();
			}

			internal virtual void RemoveImplicit (Control control)
			{
				if (impl_list != null) {
					all_controls = null;
					impl_list.Remove (control);
					owner.PerformLayout (control, "Parent");
					owner.OnControlRemoved (new ControlEventArgs (control));
				}
				control.ChangeParent (null);
				owner.UpdateChildrenZOrder ();
			}

			public void RemoveAt (int index)
			{
				if (index < 0 || index >= list.Count)
					throw new ArgumentOutOfRangeException("index", index, "ControlCollection does not have that many controls");

				Remove ((Control) list [index]);
			}

			public virtual void RemoveByKey (string key)
			{
				int index = IndexOfKey (key);
				
				if (index >= 0)
					RemoveAt (index);
			}

			public virtual void SetChildIndex(Control child, int newIndex)
			{
				if (child == null)
					throw new ArgumentNullException ("child");

				int	old_index;

				old_index=list.IndexOf(child);
				if (old_index==-1) {
					throw new ArgumentException("Not a child control", "child");
				}

				if (old_index==newIndex) {
					return;
				}

				all_controls = null;
				list.RemoveAt(old_index);

				if (newIndex>list.Count) {
					list.Add(child);
				} else {
					list.Insert(newIndex, child);
				}
				child.UpdateZOrder();
				owner.PerformLayout();
			}

			#endregion // ControlCollection Private Instance Methods

			#region ControlCollection Interface Properties

			#endregion // ControlCollection Interface Properties

			#region ControlCollection Interface Methods

			int IList.Add (object control)
			{
				if (!(control is Control))
					throw new ArgumentException ("Object of type Control required", "control");

				if (control == null)
					throw new ArgumentException ("control", "Cannot add null controls");

				this.Add ((Control)control);
				return this.IndexOf ((Control)control);
			}

			void IList.Remove (object control)
			{
				if (!(control is Control))
					throw new ArgumentException ("Object of type Control required", "control");

				this.Remove ((Control)control);
			}

			Object ICloneable.Clone ()
			{
				ControlCollection clone = new ControlCollection (this.owner);
				clone.list = (ArrayList)list.Clone ();		// FIXME: Do we need this?
				return clone;
			}

			#endregion // ControlCollection Interface Methods
		
			internal class ControlCollectionEnumerator : IEnumerator
			{
				private ArrayList list;
				int position = -1;
				
				public ControlCollectionEnumerator (ArrayList collection)
				{
					list = collection;
				}
				
				#region IEnumerator Members
				public object Current {
					get {
						try {
							return list[position];
						} catch (IndexOutOfRangeException) {
							throw new InvalidOperationException ();
						}
					}
				}

				public bool MoveNext ()
				{
					position++;
					return (position < list.Count);
				}

				public void Reset ()
				{
					position = -1;
				}

				#endregion
			}
		}
		#endregion	// ControlCollection Class
		
		#region Public Constructors
		public Control ()
		{
			if (WindowsFormsSynchronizationContext.AutoInstall)
				if (!(SynchronizationContext.Current is WindowsFormsSynchronizationContext))
					SynchronizationContext.SetSynchronizationContext (new WindowsFormsSynchronizationContext ());

			layout_type = LayoutType.Anchor;
			anchor_style = AnchorStyles.Top | AnchorStyles.Left;

			is_created = false;
			is_visible = true;
			is_captured = false;
			is_disposed = false;
			is_enabled = true;
			is_entered = false;
			layout_pending = false;
			is_toplevel = false;
			causes_validation = true;
			has_focus = false;
			layout_suspended = 0;
			mouse_clicks = 1;
			tab_index = -1;
			cursor = null;
			right_to_left = RightToLeft.Inherit;
			border_style = BorderStyle.None;
			background_color = Color.Empty;
			dist_right = 0;
			dist_bottom = 0;
			tab_stop = true;
			ime_mode = ImeMode.Inherit;
			use_compatible_text_rendering = true;
			show_keyboard_cues = false;
			show_focus_cues = SystemInformation.MenuAccessKeysUnderlined;
			use_wait_cursor = false;

			backgroundimage_layout = ImageLayout.Tile;
			use_compatible_text_rendering = Application.use_compatible_text_rendering;
			padding = this.DefaultPadding;
			maximum_size = new Size();
			minimum_size = new Size();
			margin = this.DefaultMargin;
			auto_size_mode = AutoSizeMode.GrowOnly;

			control_style = ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint | 
					ControlStyles.Selectable | ControlStyles.StandardClick | 
					ControlStyles.StandardDoubleClick;
			control_style |= ControlStyles.UseTextForAccessibility;

			parent = null;
			background_image = null;
			text = string.Empty;
			name = string.Empty;

			window_target = new ControlWindowTarget(this);
			window = new ControlNativeWindow(this);
			child_controls = CreateControlsInstance();
			
			bounds.Size = DefaultSize;
			client_size = ClientSizeFromSize (bounds.Size);
			client_rect = new Rectangle (Point.Empty, client_size);
			explicit_bounds = bounds;
		}

		public Control (Control parent, string text) : this()
		{
			Text=text;
			Parent=parent;
		}

		public Control (Control parent, string text, int left, int top, int width, int height) : this()
		{
			Parent=parent;
			SetBounds(left, top, width, height, BoundsSpecified.All);
			Text=text;
		}

		public Control (string text) : this()
		{
			Text=text;
		}

		public Control (string text, int left, int top, int width, int height) : this()
		{
			SetBounds(left, top, width, height, BoundsSpecified.All);
			Text=text;
		}

		private delegate void RemoveDelegate(object c);

		protected override void Dispose (bool disposing)
		{
			if (!is_disposed && disposing) {
				is_disposing = true;
				Capture = false;

				DisposeBackBuffer ();

				if (this.InvokeRequired) {
					if (Application.MessageLoop && IsHandleCreated) {
						this.BeginInvokeInternal(new MethodInvoker(DestroyHandle), null);
					}
				} else {
					DestroyHandle();
				}

				if (parent != null)
					parent.Controls.Remove(this);

				Control [] children = child_controls.GetAllControls ();
				for (int i=0; i<children.Length; i++) {
					children[i].parent = null;	// Need to set to null or our child will try and remove from ourselves and crash
					children[i].Dispose();
				}
			}
			is_disposed = true;
			base.Dispose(disposing);
		}
		#endregion 	// Public Constructors

		#region Internal Properties

		internal Rectangle PaddingClientRectangle
		{
			get {
				return new Rectangle (
					ClientRectangle.Left   + padding.Left,
					ClientRectangle.Top    + padding.Top, 
					ClientRectangle.Width  - padding.Horizontal, 
					ClientRectangle.Height - padding.Vertical);
			}
		}

		private MenuTracker active_tracker;
		
		internal MenuTracker ActiveTracker {
			get { return active_tracker; }
			set {
				if (value == active_tracker)
					return;

				Capture = value != null;
				active_tracker = value;
			}
		}

		// Control is currently selected, like Focused, except maintains state
		// when Form loses focus
		internal bool InternalSelected {
		        get {
		        	IContainerControl container;
			
				container = GetContainerControl();
				
				if (container != null && container.ActiveControl == this)
					return true;
					
				return false;
			}
		}

		// Looks for focus in child controls
		// and also in the implicit ones
		internal bool InternalContainsFocus {
			get {
				IntPtr focused_window;

				focused_window = XplatUI.GetFocus();
				if (IsHandleCreated) {
					if (focused_window == Handle)
						return true;

					foreach (Control child_control in child_controls.GetAllControls ())
						if (child_control.InternalContainsFocus)
							return true;
				}

				return false;
			}
		}
		
		// Mouse is currently within the control's bounds
		internal bool Entered {
			get { return this.is_entered; }
		}

		internal bool VisibleInternal {
			get { return is_visible; }
		}

		internal LayoutType ControlLayoutType {
			get { return layout_type; }
		}

		internal BorderStyle InternalBorderStyle {
			get {
				return border_style;
			}

			set {
				if (!Enum.IsDefined (typeof (BorderStyle), value))
					throw new InvalidEnumArgumentException (string.Format("Enum argument value '{0}' is not valid for BorderStyle", value));

				if (border_style != value) {
					border_style = value;

					if (IsHandleCreated) {
						XplatUI.SetBorderStyle (window.Handle, (FormBorderStyle)border_style);
						RecreateHandle ();
						Refresh ();
					} else
						client_size = ClientSizeFromSize (bounds.Size);
				}
			}
		}
		
		internal Size InternalClientSize { set { this.client_size = value; } }
		internal virtual bool ActivateOnShow { get { return true; } }
		internal Rectangle ExplicitBounds { get { return this.explicit_bounds; } set { this.explicit_bounds = value; } }

		internal bool ValidationFailed { 
			get { 
				ContainerControl c = InternalGetContainerControl ();
				if (c != null)
					return c.validation_failed;
				return false;
			}
			set { 
				ContainerControl c = InternalGetContainerControl ();
				if (c != null)
					c.validation_failed = value; 
			}
		}
		#endregion	// Internal Properties

		#region Private & Internal Methods
		
		void IDropTarget.OnDragDrop (DragEventArgs drgEvent)
		{
			OnDragDrop (drgEvent);
		}
		
		void IDropTarget.OnDragEnter (DragEventArgs drgEvent)
		{
			OnDragEnter (drgEvent);
		}
		
		void IDropTarget.OnDragLeave (EventArgs e)
		{
			OnDragLeave (e);
		}

		void IDropTarget.OnDragOver (DragEventArgs drgEvent)
		{
			OnDragOver (drgEvent);
		}

		internal IAsyncResult BeginInvokeInternal (Delegate method, object [] args) {
			return BeginInvokeInternal (method, args, FindControlToInvokeOn ());
		}

		internal IAsyncResult BeginInvokeInternal (Delegate method, object [] args, Control control) {
			AsyncMethodResult	result;
			AsyncMethodData		data;

			result = new AsyncMethodResult ();
			data = new AsyncMethodData ();

			data.Handle = control.GetInvokableHandle ();
			data.Method = method;
			data.Args = args;
			data.Result = result;

			if (!ExecutionContext.IsFlowSuppressed ()) {
				data.Context = ExecutionContext.Capture ();
			}

			XplatUI.SendAsyncMethod (data);
			return result;
		}

		// The CheckForIllegalCrossThreadCalls in the #if 2.0 of
		// Control.Handle throws an exception when we are trying
		// to get the Handle to properly invoke on.  This avoids that.
		private IntPtr GetInvokableHandle ()
		{
			if (!IsHandleCreated)
				CreateHandle ();

			return window.Handle;
		}

		internal void PointToClient (ref int x, ref int y) {
			XplatUI.ScreenToClient (Handle, ref x, ref y);
		}

		internal void PointToScreen (ref int x, ref int y) {
			XplatUI.ClientToScreen (Handle, ref x, ref y);
		}

		internal bool IsRecreating {
			get {
				return is_recreating;
			}
		}

		internal Graphics DeviceContext {
			get { return Hwnd.GraphicsContext; }
		}

		// An internal way to have a fixed height
		// Basically for DataTimePicker 2.0
		internal virtual int OverrideHeight (int height)
		{
			return height;
		}
		
		private void ProcessActiveTracker (ref Message m)
		{
			bool is_up = ((Msg) m.Msg == Msg.WM_LBUTTONUP) ||
						 ((Msg) m.Msg == Msg.WM_RBUTTONUP);
			
			MouseButtons mb = FromParamToMouseButtons ((int) m.WParam.ToInt32 ());
			
			// We add in the button that was released (not sent in WParam)
			if (is_up) {
				switch ((Msg)m.Msg) {
				case Msg.WM_LBUTTONUP:
					mb |= MouseButtons.Left;
					break;
				case Msg.WM_RBUTTONUP:
					mb |= MouseButtons.Right;
					break;
				}
			}
			
			MouseEventArgs args = new MouseEventArgs (
				mb,
				mouse_clicks,
				Control.MousePosition.X,
				Control.MousePosition.Y,
				0);

			if (is_up) {
				active_tracker.OnMouseUp (args);
				mouse_clicks = 1;
			} else {
				if (!active_tracker.OnMouseDown (args)) {
					Control control = GetRealChildAtPoint (Cursor.Position);
					if (control != null) {
						Point pt = control.PointToClient (Cursor.Position);
						XplatUI.SendMessage (control.Handle, 
							(Msg)m.Msg, 
							m.WParam, 
							MakeParam (pt.X, pt.Y));
					}
				}
			}
		}

		private Control FindControlToInvokeOn ()
		{
			Control p = this;
			do {
				if (p.IsHandleCreated)
					break;
				p = p.parent;
			} while (p != null);

			if (p == null || !p.IsHandleCreated)
				throw new InvalidOperationException ("Cannot call Invoke or BeginInvoke on a control until the window handle is created");
			
			return p;
		}

		private void InvalidateBackBuffer () {
			if (backbuffer != null)
				backbuffer.Invalidate ();
		}

		private DoubleBuffer GetBackBuffer () {
			if (backbuffer == null)
				backbuffer = new DoubleBuffer (this);
			return backbuffer;
		}

		private void DisposeBackBuffer () {
			if (backbuffer != null) {
				backbuffer.Dispose ();
				backbuffer = null;
			}
		}

		internal static void SetChildColor(Control parent) {
			Control	child;

			for (int i=0; i < parent.child_controls.Count; i++) {
				child=parent.child_controls[i];
				if (child.child_controls.Count>0) {
					SetChildColor(child);
				}
			}
		}

		internal bool Select(Control control) {
			IContainerControl	container;

			if (control == null) {
				return false;
			}

			container = GetContainerControl();
			if (container != null && (Control)container != control) {
				container.ActiveControl = control;
				if (container.ActiveControl == control && !control.has_focus && control.IsHandleCreated)
					XplatUI.SetFocus(control.window.Handle);
			}
			else if (control.IsHandleCreated) {
				XplatUI.SetFocus(control.window.Handle);
			}
			return true;
		}

		internal virtual void DoDefaultAction() {
			// Only here to be overriden by our actual controls; this is needed by the accessibility class
		}

		internal static IntPtr MakeParam (int low, int high){
			return new IntPtr (high << 16 | low & 0xffff);
		}

		internal static int LowOrder (int param) {
			return ((int)(short)(param & 0xffff));
		}

		internal static int HighOrder (long param) {
			return ((int)(short)(param >> 16));
		}

		// This method exists so controls overriding OnPaintBackground can have default background painting done
		internal virtual void PaintControlBackground (PaintEventArgs pevent) {

			bool tbstyle_flat = ((CreateParams.Style & (int) ToolBarStyles.TBSTYLE_FLAT) != 0);

			// If we have transparent background
			if (((BackColor.A != 0xff) && GetStyle(ControlStyles.SupportsTransparentBackColor)) || tbstyle_flat) {
				if (parent != null) {
					PaintEventArgs	parent_pe;
					GraphicsState	state;

					parent_pe = new PaintEventArgs(pevent.Graphics, new Rectangle(pevent.ClipRectangle.X + Left, pevent.ClipRectangle.Y + Top, pevent.ClipRectangle.Width, pevent.ClipRectangle.Height));

					state = parent_pe.Graphics.Save();
					parent_pe.Graphics.TranslateTransform(-Left, -Top);
					parent.OnPaintBackground(parent_pe);
					parent_pe.Graphics.Restore(state);

					state = parent_pe.Graphics.Save();
					parent_pe.Graphics.TranslateTransform(-Left, -Top);
					parent.OnPaint(parent_pe);
					parent_pe.Graphics.Restore(state);
					parent_pe.SetGraphics(null);
				}
			}

			if ((clip_region != null) && (XplatUI.UserClipWontExposeParent)) {
				if (parent != null) {
					PaintEventArgs	parent_pe;
					Region		region;
					GraphicsState	state;
					Hwnd		hwnd;

					hwnd = Hwnd.ObjectFromHandle(Handle);

					if (hwnd != null) {
						parent_pe = new PaintEventArgs(pevent.Graphics, new Rectangle(pevent.ClipRectangle.X + Left, pevent.ClipRectangle.Y + Top, pevent.ClipRectangle.Width, pevent.ClipRectangle.Height));

						region = new Region ();
						region.MakeEmpty();
						region.Union(ClientRectangle);

						foreach (Rectangle r in hwnd.ClipRectangles) {
							region.Union (r);
						}

						state = parent_pe.Graphics.Save();
						parent_pe.Graphics.Clip = region;

						parent_pe.Graphics.TranslateTransform(-Left, -Top);
						parent.OnPaintBackground(parent_pe);
						parent_pe.Graphics.Restore(state);

						state = parent_pe.Graphics.Save();
						parent_pe.Graphics.Clip = region;

						parent_pe.Graphics.TranslateTransform(-Left, -Top);
						parent.OnPaint(parent_pe);
						parent_pe.Graphics.Restore(state);
						parent_pe.SetGraphics(null);

						region.Intersect(clip_region);
						pevent.Graphics.Clip = region;
					}
				}
			}

			if (background_image == null) {
				if (!tbstyle_flat) {
					Rectangle paintRect = pevent.ClipRectangle;
					Brush pen = ThemeEngine.Current.ResPool.GetSolidBrush(BackColor);
					pevent.Graphics.FillRectangle(pen, paintRect);
				}
				return;
			}

			DrawBackgroundImage (pevent.Graphics);
		}

		void DrawBackgroundImage (Graphics g) {
			Rectangle drawing_rectangle = new Rectangle ();
			g.FillRectangle (ThemeEngine.Current.ResPool.GetSolidBrush (BackColor), ClientRectangle);
				
			switch (backgroundimage_layout)
			{
			case ImageLayout.Tile:
				using (TextureBrush b = new TextureBrush (background_image, WrapMode.Tile)) {
					g.FillRectangle (b, ClientRectangle);
				}
				return;
			case ImageLayout.Center:
				drawing_rectangle.Location = new Point (ClientSize.Width / 2 - background_image.Width / 2, ClientSize.Height / 2 - background_image.Height / 2);
				drawing_rectangle.Size = background_image.Size;
				break;
			case ImageLayout.None:
				drawing_rectangle.Location = Point.Empty;
				drawing_rectangle.Size = background_image.Size;
				break;
			case ImageLayout.Stretch:
				drawing_rectangle = ClientRectangle;
				break;
			case ImageLayout.Zoom:
				drawing_rectangle = ClientRectangle;
				if ((float)background_image.Width / (float)background_image.Height < (float)drawing_rectangle.Width / (float) drawing_rectangle.Height) {
					drawing_rectangle.Width = (int) (background_image.Width * ((float)drawing_rectangle.Height / (float)background_image.Height));
					drawing_rectangle.X = (ClientRectangle.Width - drawing_rectangle.Width) / 2;
				} else {
					drawing_rectangle.Height = (int) (background_image.Height * ((float)drawing_rectangle.Width / (float)background_image.Width));
					drawing_rectangle.Y = (ClientRectangle.Height - drawing_rectangle.Height) / 2;
				}
				break;
			default:
				return;
			}

			g.DrawImage (background_image, drawing_rectangle);

		}

		internal virtual void DndEnter (DragEventArgs e) {
			try {
				OnDragEnter (e);
			} catch { }
		}

		internal virtual void DndOver (DragEventArgs e) {
			try {
				OnDragOver (e);
			} catch { }
		}

		internal virtual void DndDrop (DragEventArgs e) {
			try {
				OnDragDrop (e);
			} catch (Exception exc) {
				Console.Error.WriteLine ("MWF: Exception while dropping:");
				Console.Error.WriteLine (exc);
			}
		}

		internal virtual void DndLeave (EventArgs e) {
			try {
				OnDragLeave (e);
			} catch { }
		}

		internal virtual void DndFeedback(GiveFeedbackEventArgs e) {
			try {
				OnGiveFeedback(e);
			} catch { }
		}

		internal virtual void DndContinueDrag(QueryContinueDragEventArgs e) {
			try {
				OnQueryContinueDrag(e);
			} catch { }
		}
		
		internal static MouseButtons FromParamToMouseButtons (long param) {		
			MouseButtons buttons = MouseButtons.None;
					
			if ((param & (long) MsgButtons.MK_LBUTTON) != 0)
				buttons |= MouseButtons.Left;

			if ((param & (long)MsgButtons.MK_MBUTTON) != 0)
				buttons |= MouseButtons.Middle;

			if ((param & (long)MsgButtons.MK_RBUTTON) != 0)
				buttons |= MouseButtons.Right;
				
			return buttons;
		}

		internal virtual void FireEnter () {
			OnEnter (EventArgs.Empty);
		}

		internal virtual void FireLeave () {
			OnLeave (EventArgs.Empty);
		}

		internal virtual void FireValidating (CancelEventArgs ce) {
			OnValidating (ce);
		}

		internal virtual void FireValidated () {
			OnValidated (EventArgs.Empty);
		}

		internal virtual bool ProcessControlMnemonic(char charCode) {
			return ProcessMnemonic(charCode);
		}

		private static Control FindFlatForward(Control container, Control start) {
			Control	found;
			int	index;
			int	end;
			bool hit;

			found = null;
			end = container.child_controls.Count;
			hit = false;

			if (start != null) {
				index = start.tab_index;
			} else {
				index = -1;
			}

			for (int i = 0; i < end; i++) {
				if (start == container.child_controls[i]) {
					hit = true;
					continue;
				}

				if (found == null || found.tab_index > container.child_controls[i].tab_index) {
					if (container.child_controls[i].tab_index > index || (hit && container.child_controls[i].tab_index == index)) {
						found = container.child_controls[i];
					}
				}
			}
			return found;
		}

		private static Control FindControlForward(Control container, Control start) {
			Control found;

			found = null;

			if (start == null) {
				return FindFlatForward(container, start);
			}

			if (start.child_controls != null && start.child_controls.Count > 0 && 
				(start == container || !((start is IContainerControl) &&  start.GetStyle(ControlStyles.ContainerControl)))) {
				return FindControlForward(start, null);
			}
			else {
				while (start != container) {
					found = FindFlatForward(start.parent, start);
					if (found != null) {
						return found;
					}
					start = start.parent;
				}
			}
			return null;
		}

		private static Control FindFlatBackward(Control container, Control start) {
			Control	found;
			int	index;
			int	end;
			bool hit;

			found = null;
			end = container.child_controls.Count;
			hit = false;

			if (start != null) {
				index = start.tab_index;
			} else {
				index = int.MaxValue;
			}

			for (int i = end - 1; i >= 0; i--) {
				if (start == container.child_controls[i]) {
					hit = true;
					continue;
				}

				if (found == null || found.tab_index < container.child_controls[i].tab_index) {
					if (container.child_controls[i].tab_index < index || (hit && container.child_controls[i].tab_index == index))
						found = container.child_controls[i];

				}
			}
			return found;
		}

		private static Control FindControlBackward(Control container, Control start) {

			Control found = null;

			if (start == null) {
				found = FindFlatBackward(container, start);
			}
			else if (start != container) {
				if (start.parent != null) {
					found = FindFlatBackward(start.parent, start);

					if (found == null) {
						if (start.parent != container)
							return start.parent;
						return null;
					}
				}
			}
		
			if (found == null || start.parent == null)
				found = start;

			while (found != null && (found == container || (!((found is IContainerControl) && found.GetStyle(ControlStyles.ContainerControl))) &&
				found.child_controls != null && found.child_controls.Count > 0)) {
//				while (ctl.child_controls != null && ctl.child_controls.Count > 0 && 
//					(ctl == this || (!((ctl is IContainerControl) && ctl.GetStyle(ControlStyles.ContainerControl))))) {
				found = FindFlatBackward(found, null);
			}

			return found;

/*
			Control found;

			found = null;

			if (start != null) {
				found = FindFlatBackward(start.parent, start);
				if (found == null) {
					if (start.parent != container) {
						return start.parent;
					}
				}
			}
			if (found == null) {
				found = FindFlatBackward(container, start);
			}

			if (container != start) {
				while ((found != null) && (!found.Contains(start)) && found.child_controls != null && found.child_controls.Count > 0 && !(found is IContainerControl)) {// || found.GetStyle(ControlStyles.ContainerControl))) {
					found = FindControlBackward(found, null);
					 if (found != null) {
						return found;
					}
				}
			}
			return found;
*/			
		}

		internal virtual void HandleClick(int clicks, MouseEventArgs me) {
			bool standardclick = GetStyle (ControlStyles.StandardClick);
			bool standardclickclick = GetStyle (ControlStyles.StandardDoubleClick);
			if ((clicks > 1) && standardclick && standardclickclick) {
				OnDoubleClick (me);
				OnMouseDoubleClick (me);
			} else if (clicks == 1 && standardclick && !ValidationFailed) {
				OnClick (me);
				OnMouseClick (me);
			}
		}
		
		internal void CaptureWithConfine (Control ConfineWindow) {
			if (this.IsHandleCreated && !is_captured) {
				is_captured = true;
				XplatUI.GrabWindow (this.window.Handle, ConfineWindow.Handle);
			}
		}

		private void CheckDataBindings () {
			if (data_bindings == null)
				return;

			foreach (Binding binding in data_bindings) {
				binding.Check ();
			}
		}

		private void ChangeParent(Control new_parent) {
			bool		pre_enabled;
			bool		pre_visible;
			Font		pre_font;
			Color		pre_fore_color;
			Color		pre_back_color;
			RightToLeft	pre_rtl;

			// These properties are inherited from our parent
			// Get them pre parent-change and then send events
			// if they are changed after we have our new parent
			pre_enabled = Enabled;
			pre_visible = Visible;
			pre_font = Font;
			pre_fore_color = ForeColor;
			pre_back_color = BackColor;
			pre_rtl = RightToLeft;
			// MS doesn't seem to send a CursorChangedEvent

			parent = new_parent;

			Form frm = this as Form;
			if (frm != null) {
				frm.ChangingParent (new_parent);
			} else if (IsHandleCreated) {
				IntPtr parent_handle = IntPtr.Zero;
				if (new_parent != null && new_parent.IsHandleCreated)
					parent_handle = new_parent.Handle;
				XplatUI.SetParent (Handle, parent_handle);
			}
			
			OnParentChanged(EventArgs.Empty);

			if (pre_enabled != Enabled) {
				OnEnabledChanged(EventArgs.Empty);
			}

			if (pre_visible != Visible) {
				OnVisibleChanged(EventArgs.Empty);
			}

			if (pre_font != Font) {
				OnFontChanged(EventArgs.Empty);
			}

			if (pre_fore_color != ForeColor) {
				OnForeColorChanged(EventArgs.Empty);
			}

			if (pre_back_color != BackColor) {
				OnBackColorChanged(EventArgs.Empty);
			}

			if (pre_rtl != RightToLeft) {
				// MS sneaks a OnCreateControl and OnHandleCreated in here, I guess
				// because when RTL changes they have to recreate the win32 control
				// We don't really need that (until someone runs into compatibility issues)
				OnRightToLeftChanged(EventArgs.Empty);
			}

			if ((new_parent != null) && new_parent.Created && is_visible && !Created) {
				CreateControl();
			}

			if ((binding_context == null) && Created) {
				OnBindingContextChanged(EventArgs.Empty);
			}
		}

		// Sometimes we need to do this calculation without it being virtual (constructor)
		internal Size InternalSizeFromClientSize (Size clientSize)
		{
			Rectangle ClientRect;
			Rectangle WindowRect;
			CreateParams cp;

			ClientRect = new Rectangle (0, 0, clientSize.Width, clientSize.Height);
			cp = this.CreateParams;

			if (XplatUI.CalculateWindowRect (ref ClientRect, cp, null, out WindowRect))
				return new Size (WindowRect.Width, WindowRect.Height);

			return Size.Empty;
		}
		
		internal Size ClientSizeFromSize (Size size)
		{
			// Calling this gives us the difference in Size and ClientSize.
			// We just have to apply that difference to our given size.
			Size client_size = this.InternalSizeFromClientSize (size);
			
			if (client_size == Size.Empty)
				return Size.Empty;
				
			return new Size (size.Width - (client_size.Width - size.Width), size.Height - (client_size.Height - size.Height));
		}
		
		internal CreateParams GetCreateParams ()
		{
			return CreateParams;
		}

		internal virtual Size GetPreferredSizeCore (Size proposedSize)
		{
			return this.explicit_bounds.Size;
		}

		private void UpdateDistances() {
			if (parent != null) {
				if (bounds.Width >= 0)
					dist_right = parent.ClientSize.Width - bounds.X - bounds.Width;
				if (bounds.Height >= 0)
					dist_bottom = parent.ClientSize.Height - bounds.Y - bounds.Height;

				recalculate_distances = false;
			}
		}
		
		private Cursor GetAvailableCursor ()
		{
			if (Cursor != null && Enabled) {
				return Cursor;
			}

			if (Parent != null) {
				return Parent.GetAvailableCursor ();
			}

			return Cursors.Default;
		}
		
		private void UpdateCursor ()
		{
			if (!IsHandleCreated)
				return;
			
			if (!Enabled) {
				XplatUI.SetCursor (window.Handle, GetAvailableCursor ().handle);
				return;
			}

			Point pt = PointToClient (Cursor.Position);

			if (!bounds.Contains (pt) && !Capture)
				return;

			if (cursor != null || use_wait_cursor) {
				XplatUI.SetCursor (window.Handle, Cursor.handle);
			} else {
				XplatUI.SetCursor (window.Handle, GetAvailableCursor ().handle);
			}
		}
		
		private bool UseDoubleBuffering {
			get {
				if (!ThemeEngine.Current.DoubleBufferingSupported)
					return false;

				// Since many of .Net's controls are unmanaged, they are doublebuffered
				// even though their bits may not be set in managed land.  This allows
				// us to doublebuffer as well without affecting public style bits.
				if (force_double_buffer)
					return true;
					
				if (DoubleBuffered)
					return true;
				return (control_style & ControlStyles.DoubleBuffer) != 0;
			}
		}

		internal void OnSizeInitializedOrChanged ()
		{
			Form form = this as Form;
			if (form != null && form.WindowManager != null)
				ThemeEngine.Current.ManagedWindowOnSizeInitializedOrChanged (form);
		}
		#endregion	// Private & Internal Methods

		#region Public Static Properties
		public static Color DefaultBackColor {
			get {
				return ThemeEngine.Current.DefaultControlBackColor;
			}
		}

		public static Font DefaultFont {
			get {
				return ThemeEngine.Current.DefaultFont;
			}
		}

		public static Color De…