[mono.git] / mcs / class / Managed.Windows.Forms / System.Windows.Forms / Control.cs

// 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 Novell, Inc.
//
// Authors:
//      Peter Bartok            pbartok@novell.com
//
// 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
//
// $Revision: 1.27 $
// $Modtime: $
// $Log: Control.cs,v $
// Revision 1.27  2004/08/13 19:00:15  jordi
// implements PointToClient (ScreenToClient)
//
// Revision 1.26  2004/08/13 18:52:07  pbartok
// - Added Dispose() and destructor
// - Fixed resizing and bounds calculation
// - Fixed Layout
// - Added memory savings for invisible windows
//
// Revision 1.25  2004/08/12 19:31:19  pbartok
// - Fixed Anchoring bugs
//
// Revision 1.24  2004/08/12 16:10:42  jackson
// Add missing properties
//
// Revision 1.23  2004/08/11 22:20:59  pbartok
// - Signature fixes
//
// Revision 1.22  2004/08/11 19:19:44  pbartok
// - We had SetWindowPos and MoveWindow to set window positions and size,
//   removed MoveWindow. We have GetWindowPos, so it made sense to keep
//   SetWindowPos as matching counterpart
// - Added some X11 sanity checking
//
// Revision 1.21  2004/08/11 18:59:45  pbartok
// - Major cleanup of my SetBounds/SetBoundsCore/UpdateBounds mess
//   (It seems that SetBounds is just a front for SetBoundsCore and
//    SetBoundsCore updates the underlying window system and UpdateBounds is
//    responsible for updating the variables associated with the Control and
//    sending the events)
// - Major cleanup of Size handling; we now have two sizes, client_size and
//   bounds. Bounds defines the window with decorations, client_size without
//   them.
//
// Revision 1.20  2004/08/11 15:13:32  pbartok
// - Now properly reparents windows
//
// Revision 1.19  2004/08/11 14:37:11  pbartok
// - Duh!
//
// Revision 1.18  2004/08/11 13:47:22  pbartok
// - Rewrote the collection stuff. Might not be as fast now, not keeping
//   the number of children around and accessible directly, but it's more
//   straightforward
//
// Revision 1.17  2004/08/10 18:32:10  jordi
// throw ontextchange event
//
// Revision 1.16  2004/08/10 17:43:04  pbartok
// - Added more to the still unfinished Dock/Anchor layout code
//
// Revision 1.15  2004/08/10 15:08:05  jackson
// Control will now handle the buffering code, so each control does not have to implement this.
//
// Revision 1.14  2004/08/09 22:11:25  pbartok
// - Added incomplete dock layout code
// - Added support for mouse wheel
//
// Revision 1.13  2004/08/09 17:25:56  jackson
// Use new color names
//
// Revision 1.12  2004/08/09 15:54:51  jackson
// Get default properties from the theme.
//
// Revision 1.11  2004/08/06 21:30:56  pbartok
// - Fixed recursive loop when resizing
// - Improved/fixed redrawing on expose messages
//
// Revision 1.10  2004/08/06 15:53:39  jordi
// X11 keyboard navigation
//
// Revision 1.9  2004/08/04 21:14:26  pbartok
// - Fixed Invalidation bug (calculated wrong client area)
// - Added ClientSize setter
//
// Revision 1.8  2004/08/04 20:11:24  pbartok
// - Added Invalidate handling
//
// Revision 1.7  2004/07/27 10:38:17  jordi
// changes to be able to run winforms samples
//
// Revision 1.6  2004/07/19 19:09:42  jordi
// label control re-written: added missing functionlity, events, and properties
//
// Revision 1.5  2004/07/19 16:49:23  jordi
// fixes SetBounds logic
//
// Revision 1.4  2004/07/19 07:29:35  jordi
// Call RefreshWindow only if the window has created
//
// Revision 1.3  2004/07/15 17:03:35  jordi
// added basic mouse handeling events
//
// Revision 1.2  2004/07/13 15:31:45  jordi
// commit: new properties and fixes form size problems
//
// Revision 1.1  2004/07/09 05:21:25  pbartok
// - Initial check-in
//
//

// NOT COMPLETE 

using System;
using System.Drawing;
using System.ComponentModel;
using System.Collections;
using System.Diagnostics;
using System.Threading;
using System.Runtime.InteropServices;

namespace System.Windows.Forms
{
        public class Control : Component, ISynchronizeInvoke, IWin32Window
        {
                #region Local Variables

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

                // State
                internal bool                   has_focus;              // true if control has focus
                internal bool                   is_visible;             // true if control is visible
                internal bool                   is_enabled;             // true if control is enabled (usable/not grayed out)
                internal int                    tab_index;              // position in tab order of siblings
                internal bool                   tab_stop = true;
                internal bool                   is_disposed;            // has the window already been disposed?
                internal Size                   client_size;            // size of the client area (window excluding decorations)
                internal ControlStyles          control_style;          // rather win32-specific, style bits for control
                internal ImeMode                ime_mode = ImeMode.Inherit;

                // Visuals
                internal Color                  foreground_color;       // foreground color for control
                internal Color                  background_color;       // background color for control
                internal Image                  background_image;       // background image for control
                internal Font                   font;                   // font for control
                internal string                 text;                   // window/title text for control

                // Layout
                internal AnchorStyles           anchor_style;           // anchoring requirements for our control
                internal DockStyle              dock_style;             // docking requirements for our control (supercedes anchoring)
                internal int                    prev_width;             // previous width of the control; required for anchoring
                internal int                    prev_height;            // previous height of our control; required for anchoring
                internal Size prev_size;

                // to be categorized...
                static internal Hashtable       controls;               // All of the applications controls, in a flat list
                internal ControlCollection      child_controls;         // our children
                internal Control                parent;                 // our parent control
                internal AccessibleObject       accessibility_object;   // object that contains accessibility information about our control
                internal BindingContext         binding_context;        // TODO
                internal RightToLeft            right_to_left;          // drawing direction for control
                internal int                    layout_suspended;

                private Graphics                dc_mem;                 // Graphics context for double buffering
                private Bitmap                  bmp_mem;                // Bitmap for double buffering control

                #endregion      // Local Variables

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

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

                        protected override void WndProc(ref Message m) {
                                control.WndProc(ref m);
                        }
                }
                #endregion
                
                #region Public Classes
                public class ControlCollection : IList, ICollection, ICloneable, IEnumerable {
                        #region ControlCollection Local Variables
                        private ArrayList       list;
                        private Control         owner;
                        #endregion      // ControlCollection Local Variables

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

                        #region ControlCollection Public Instance Properties
                        public int Count {
                                get {
                                        return list.Count;
                                }
                        }

                        public bool IsReadOnly {
                                get {
                                        return list.IsReadOnly;
                                }
                        }

                        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 Private Instance Methods
                        public virtual void Add(Control value) {
                                for (int i=0; i<list.Count; i++) {
                                        if (list[i]==value) {
                                                // Do we need to do anything here?
                                                return;
                                        }
                                }
                                list.Add(value);
                                value.Parent=owner;
                        }
                        
                        public virtual void AddRange(Control[] controls) {
                                for (int i=0; i<controls.Length; i++) {
                                        Add(controls[i]);
                                }
                        }

                        public virtual void Clear() {
                                owner.SuspendLayout();
                                list.Clear();
                                owner.ResumeLayout();
                        }

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

                        public void CopyTo(Array array, int index) {
                                list.CopyTo(array, index);
                        }

                        public override bool Equals(object other) {
                                if (other is ControlCollection && (((ControlCollection)other).owner==this.owner)) {
                                        return(true);
                                } else {
                                        return(false);
                                }
                        }

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

                        public 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 IEnumerator GetEnumerator() {
                                return list.GetEnumerator();
                        }

                        public override int GetHashCode() {
                                return base.GetHashCode();
                        }

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

                        public virtual void Remove(Control value) {
                                list.Remove(value);
                        }

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

                                list.RemoveAt(index);
                        }

                        public void SetChildIndex(Control child, int newIndex) {
                                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;
                                }

                                RemoveAt(old_index);

                                if (newIndex>list.Count) {
                                        list.Add(child);
                                } else {
                                        list.Insert(newIndex, child);
                                }
                        }
                        #endregion // ControlCollection Private Instance Methods

                        #region ControlCollection Interface Properties
                        object IList.this[int index] {
                                get {
                                        if (index<0 || index>=list.Count) {
                                                throw new ArgumentOutOfRangeException("index", index, "ControlCollection does not have that many controls");
                                        }
                                        return this[index];
                                }

                                set {
                                        if (!(value is Control)) {
                                                throw new ArgumentException("Object of type Control required", "value");
                                        }

                                        list[index]=(Control)value;
                                }
                        }

                        bool IList.IsFixedSize {
                                get {
                                        return false;
                                }
                        }

                        bool IList.IsReadOnly {
                                get {
                                        return list.IsReadOnly;
                                }
                        }

                        bool ICollection.IsSynchronized {
                                get {
                                        return list.IsSynchronized;
                                }
                        }

                        object ICollection.SyncRoot {
                                get {
                                        return list.SyncRoot;
                                }
                        }
                        #endregion // ControlCollection Interface Properties

                        #region ControlCollection Interface Methods
                        int IList.Add(object value) {
                                if (value == null) {
                                        throw new ArgumentNullException("value", "Cannot add null controls");
                                }

                                if (!(value is Control)) {
                                        throw new ArgumentException("Object of type Control required", "value");
                                }

                                return list.Add(value);
                        }

                        bool IList.Contains(object value) {
                                if (!(value is Control)) {
                                        throw new ArgumentException("Object of type Control required", "value");
                                }

                                return this.Contains((Control) value);
                        }

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

                                return this.IndexOf((Control) value);
                        }

                        void IList.Insert(int index, object value) {
                                if (!(value is Control)) {
                                        throw new ArgumentException("Object of type Control required", "value");
                                }
                                list.Insert(index, value);
                        }

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

                        void ICollection.CopyTo(Array array, int index) {
                                if (list.Count>0) {
                                        list.CopyTo(array, index);
                                }
                        }

                        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
                }
                #endregion      // ControlCollection Class
                
                #region Public Constructors
                public Control() {
                        creator_thread = Thread.CurrentThread;
                        controls = new Hashtable();
                        child_controls = CreateControlsInstance();
                        bounds = new Rectangle(0, 0, DefaultSize.Width, DefaultSize.Height);
                        client_size = new Size(DefaultSize.Width, DefaultSize.Height);
                        prev_size = Size.Empty;

                        is_visible = true;
                        is_disposed = false;
                        is_enabled = true;
                        has_focus = false;
                        layout_suspended = 0;

                        parent = null;
                        background_image = null;
                }

                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;
                        bounds.X=left;
                        bounds.Y=top;
                        bounds.Width=width;
                        bounds.Height=height;
                        SetBoundsCore(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() {
                        bounds.X=left;
                        bounds.Y=top;
                        bounds.Width=width;
                        bounds.Height=height;
                        SetBoundsCore(left, top, width, height, BoundsSpecified.All);
                        Text=text;
                }

                ~Control() {
                        Dispose(true);
                }
        
                public void Dispose() {
                        Dispose(true);
                        GC.SuppressFinalize(this);
                }

                protected override void Dispose(bool disposing) {
                        if (dc_mem!=null) {
                                dc_mem.Dispose();
                                dc_mem=null;
                        }

                        if (bmp_mem!=null) {
                                bmp_mem.Dispose();
                                bmp_mem=null;
                        }

                        DestroyHandle();
                        is_disposed=true;
                }
                #endregion      // Public Constructors

                #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 DefaultForeColor {
                        get {
                                return ThemeEngine.Current.DefaultControlForeColor;
                        }
                }

                public static Keys ModifierKeys {
                        get {
                                return XplatUI.State.ModifierKeys;
                        }
                }

                public static MouseButtons MouseButtons {
                        get {
                                return XplatUI.State.MouseButtons;
                        }
                }

                public static Point MousePosition {
                        get {                           
                                int x = 0, y = 0;
                                XplatUI.GetCursorPos (IntPtr.Zero, ref x, ref y);
                                return new Point (x, y);
                        }
                }
                #endregion      // Public Static Properties

                #region Public Instance Properties
                public AccessibleObject AccessibilityObject {
                        get {
                                if (accessibility_object==null) {
                                        accessibility_object=CreateAccessibilityInstance();
                                }
                                return accessibility_object;
                        }
                }

                public string AccessibleDefaultActionDescription {
                        get {
                                return AccessibilityObject.default_action;
                        }

                        set {
                                AccessibilityObject.default_action=value;
                        }
                }

                public string AccessibleDescription {
                        get {
                                return AccessibilityObject.description;
                        }

                        set {
                                AccessibilityObject.description=value;
                        }
                }

                public string AccessibleName {
                        get {
                                return AccessibilityObject.Name;
                        }

                        set {
                                AccessibilityObject.Name=value;
                        }
                }

                public AccessibleRole AccessibleRole {
                        get {
                                return AccessibilityObject.role;
                        }

                        set {
                                AccessibilityObject.role=value;
                        }
                }

                public virtual bool AllowDrop {
                        get {
                                return XplatUI.State.DropTarget;
                        }

                        set {
                                XplatUI.State.DropTarget=value;
                        }
                }

                public virtual AnchorStyles Anchor {
                        get {
                                return anchor_style;
                        }

                        set {
                                anchor_style=value;
                        }
                }

                public virtual Color BackColor {
                        get {
                                if (background_color.IsEmpty) {
                                        if (parent!=null) {
                                                return parent.BackColor;
                                        }
                                        return DefaultBackColor;
                                }
                                return background_color;
                        }

                        set {
                                background_color=value;
                                Refresh();
                        }
                }

                public virtual Image BackgroundImage {
                        get {
                                return background_image;
                        }

                        set {
                                if (background_image!=value) {
                                        background_image=value;
                                        OnBackgroundImageChanged(EventArgs.Empty);
                                }
                        }
                }

                public virtual BindingContext BindingContext {
                        get {
                                throw new NotImplementedException();
                        }

                        set {
                                throw new NotImplementedException();
                        }
                }


                public int Bottom {
                        get {
                                return bounds.Y+bounds.Height;
                        }
                }

                public Rectangle Bounds {
                        get {
                                return this.bounds;
                        }

                        set {
                                SetBoundsCore(value.Left, value.Top, value.Width, value.Height, BoundsSpecified.All);
                        }
                }

                public bool CanFocus {
                        get {
                                throw new NotImplementedException();
                        }
                }

                public bool CanSelect {
                        get {
                                throw new NotImplementedException();
                        }
                }

                public bool Capture {
                        get {
                                throw new NotImplementedException();
                        }

                        set {
                                throw new NotImplementedException();
                        }
                }

                public bool CausesValidation {
                        get {
                                throw new NotImplementedException();
                        }

                        set {
                                throw new NotImplementedException();
                        }
                }

                public Rectangle ClientRectangle {
                        get {
                                return new Rectangle(0, 0, client_size.Width, client_size.Height);
                        }
                }

                public Size ClientSize {
                        get {
                                return client_size;
                        }

                        set {
                                this.SetClientSizeCore(value.Width, value.Height);
                        }
                }

                public String CompanyName {
                        get {
                                return "Mono Project, Novell, Inc.";
                        }
                }

                public bool ContainsFocus {
                        get {
                                throw new NotImplementedException();
                        }
                }
#if notdef
                public virtual ContextMenu ContextMenu {
                        get {
                                throw new NotImplementedException();
                        }

                        set {
                                throw new NotImplementedException();
                        }
                }
#endif

                public ControlCollection Controls {
                        get {
                                return this.child_controls;
                        }
                }

                public bool Created {
                        get {
                                throw new NotImplementedException();
                        }
                }

#if notdef
                public virtual Cursor Cursor {
                        get {
                                throw new NotImplementedException();
                        }

                        set {
                                throw new NotImplementedException();
                        }
                }

                public ControlBidingsCollection DataBindings {
                        get {
                                throw new NotImplementedException();
                        }
                }
#endif
                public virtual Rectangle DisplayRectangle {
                        get {
                                return ClientRectangle;
                        }
                }

                public bool Disposing {
                        get {
                                throw new NotImplementedException();
                        }
                }

                public virtual DockStyle Dock {
                        get { return dock_style;}

                        set {
                                if (dock_style == value)
                                        return;

                                dock_style = value;
                                OnDockChanged(EventArgs.Empty);
                        }
                }

                public bool Enabled {
                        get {
                                return is_enabled;
                        }

                        set {
                                is_enabled = value;
                        }
                }

                public virtual bool Focused {
                        get {
                                return this.has_focus;
                        }
                }

                public virtual Font Font {
                        get {
                                if (font != null) {
                                        return font;
                                }

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

                                return DefaultFont;
                        }

                        set {
                                font=value;
                                Refresh();
                        }
                }

                public virtual Color ForeColor {
                        get {
                                if (foreground_color.IsEmpty) {
                                        if (parent!=null) {
                                                return parent.ForeColor;
                                        }
                                        return DefaultForeColor;
                                }
                                return foreground_color;
                        }

                        set {
                                foreground_color=value;
                                Refresh();
                        }
                }

                public bool IsDisposed {
                        get {
                                return this.is_disposed;
                        }
                }

                public bool IsHandleCreated {
                        get {
                                if ((window!=null) && (window.Handle!=IntPtr.Zero)) {
                                        return true;
                                }

                                return false;
                        }
                }

                public string Name {
                        get {
                                return this.name;
                        }

                        set {
                                this.name=value;
                        }
                }

                public Control Parent {
                        get {
                                return this.parent;
                        }

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

                                        parent=value;

                                        if (!parent.Controls.Contains(this)) {
                                                parent.Controls.Add(this);
                                        }

                                        XplatUI.SetParent(Handle, value.Handle);
                                }
                        }
                }


                public IntPtr Handle {                                                  // IWin32Window
                        get 
                        {
                                if (!IsHandleCreated) {
                                        CreateHandle();
                                }
                                return window.Handle;
                        }
                }

                public bool InvokeRequired {                                            // ISynchronizeInvoke
                        get {
                                if (creator_thread!=Thread.CurrentThread) {
                                        return true;
                                }
                                return false;
                        }
                }

                public bool Visible {
                        get {
                                return this.is_visible;
                        }

                        set {
                                if (value!=is_visible) {
                                        is_visible=value;
                                        XplatUI.SetVisible(Handle, value);
                                }
                        }
                }

                public virtual string Text {
                        get {
                                return this.text;
                        }

                        set {
                                if (text!=value) {
                                        text=value;
                                        XplatUI.Text(Handle, text);
                                        OnTextChanged (EventArgs.Empty);
                                }
                        }
                }

                public int Left {
                        get {
                                return this.bounds.X;
                        }

                        set {
                                SetBoundsCore(value, bounds.Y, bounds.Width, bounds.Height, BoundsSpecified.X);
                        }
                }

                public int Top {
                        get {
                                return this.bounds.Y;
                        }

                        set {
                                SetBoundsCore(bounds.X, value, bounds.Width, bounds.Height, BoundsSpecified.Y);
                        }
                }

                public int Width {
                        get {
                                return this.bounds.Width;
                        }

                        set {
                                SetBoundsCore(bounds.X, bounds.Y, value, bounds.Height, BoundsSpecified.Width);
                        }
                }

                public int Height {
                        get {
                                return this.bounds.Height;
                        }

                        set {
                                SetBoundsCore(bounds.X, bounds.Y, bounds.Width, value, BoundsSpecified.Height);
                        }
                }

                public Point Location {
                        get {
                                return new Point(bounds.X, bounds.Y);
                        }

                        set {
                                SetBoundsCore(value.X, value.Y, bounds.Width, bounds.Height, BoundsSpecified.Location);
                        }
                }

                public Size Size {
                        get {
                                return new Size(Width, Height);
                        }

                        set {
                                SetBoundsCore(bounds.X, bounds.Y, value.Width, value.Height, BoundsSpecified.Size);
                        }
                }

                public ImeMode ImeMode {
                        get { return ime_mode; }
                        set { ime_mode = value; }
                }

                public bool TabStop {
                        get { return tab_stop; }
                        set { tab_stop = value; }
                }

                public int TabIndex {
                        get {
                                return tab_index;
                        }

                        set {
                                tab_index = value;
                        }
                }

                #endregion      // Public Instance Properties

                internal Graphics DeviceContext {
                        get { 
                                if (dc_mem==null) {
                                        CreateBuffers(this.Width, this.Height);
                                }
                                return dc_mem;
                        }
                }

                internal Bitmap ImageBuffer {
                        get {
                                if (bmp_mem==null) {
                                        CreateBuffers(this.Width, this.Height);
                                }
                                return bmp_mem;
                        }
                }

                internal void CreateBuffers (int width, int height)
                {
                        if (dc_mem != null)
                                dc_mem.Dispose ();
                        if (bmp_mem != null)
                                bmp_mem.Dispose ();

                        bmp_mem = new Bitmap (width, height, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
                        dc_mem = Graphics.FromImage (bmp_mem);
                }

                #region Protected Instance Properties
                protected virtual CreateParams CreateParams {
                        get {
                                CreateParams create_params = new CreateParams();

                                create_params.Caption = Text;
                                create_params.X = Left;
                                create_params.Y = Top;
                                create_params.Width = Width;
                                create_params.Height = Height;

                                create_params.ClassName = XplatUI.DefaultClassName;
                                create_params.ClassStyle = 0;
                                create_params.ExStyle = 0;
                                create_params.Param = 0;

                                if (parent!=null) {
                                        create_params.Parent = parent.Handle;
                                }

                                create_params.Style = (int)WindowStyles.WS_OVERLAPPED;

                                if (is_visible) {
                                        create_params.Style |= (int)WindowStyles.WS_VISIBLE;
                                }

                                return create_params;
                        }
                }

                protected virtual ImeMode DefaultImeMode {
                        get {
                                return ImeMode.Inherit;
                        }
                }

                protected virtual Size DefaultSize {
                        get {
                                return new Size(100, 23);
                        }
                }

                #endregion      // Protected Instance Properties

                #region Public Instance Methods
                public bool Contains(Control ctl) {
                        Control current;

                        current=ctl;
                        while (current!=null) {
                                if (current==ctl) {
                                        return true;
                                }
                                current=current.parent;
                        }
                        return false;
                }

                public void CreateControl() {
                        Control child;

                        CreateHandle();

                        for (int i=0; i<child_controls.Count; i++) {
                                child_controls[i].CreateControl();
                        }
                        OnCreateControl();
                }

                public virtual void Refresh() {                 
                        if (IsHandleCreated == true)
                                XplatUI.RefreshWindow(window.Handle);
                }

                public void SetBounds(int x, int y, int width, int height) {
                        SetBoundsCore(x, y, width, height, BoundsSpecified.All);
                }

                public void SetBounds(int x, int y, int width, int height, BoundsSpecified specified) {
                        SetBoundsCore(x, y, width, height, specified);
                }

                public void Show() {
                        if (!IsHandleCreated) {
                                this.CreateHandle();
                        }

                        this.Visible=true;                      
                }

                public object Invoke(Delegate method) {                                 // ISynchronizeInvoke
                        return Invoke(method, null);
                }

                public object Invoke(Delegate method, object[] args) {                  // ISynchronizeInvoke
                        IAsyncResult    result;

                        result=BeginInvoke(method, args);
                        return EndInvoke(result);
                }

                public IAsyncResult BeginInvoke(Delegate method) {                      // ISynchronizeInvoke
                        return BeginInvoke(method, null);
                }

                protected virtual AccessibleObject CreateAccessibilityInstance() {
                        return new AccessibleObject(this);
                }

                protected virtual ControlCollection CreateControlsInstance() {
                        return new ControlCollection(this);
                }

                protected void UpdateBounds() {
                        int     x;
                        int     y;
                        int     width;
                        int     height;
                        int     client_width;
                        int     client_height;

                        if (!IsHandleCreated) {
                                CreateHandle();
                        }

                        XplatUI.GetWindowPos(this.Handle, out x, out y, out width, out height, out client_width, out client_height);
                        UpdateBounds(x, y, width, height, client_width, client_height);
                }

                protected void UpdateBounds(int x, int y, int width, int height) {
                        // UpdateBounds only seems to set our sizes and fire events but not update the GUI window to match
                        bool    moved   = false;
                        bool    resized = false;

                        int     client_x_diff = this.bounds.Width-this.client_size.Width;
                        int     client_y_diff = this.bounds.Height-this.client_size.Height;

                        // Needed to generate required notifications
                        if ((this.bounds.X!=x) || (this.bounds.Y!=y)) {
                                moved=true;
                        }

                        if ((this.Bounds.Width!=width) || (this.Bounds.Height!=height)) {
                                resized=true;
                        }

                        bounds.X=x;
                        bounds.Y=y;
                        bounds.Width=width;
                        bounds.Height=height;

                        // Update client rectangle as well
                        prev_size.Width=client_size.Width;
                        prev_size.Height=client_size.Height;
                        client_size.Width=width-client_x_diff;
                        client_size.Height=height-client_y_diff;

                        if (moved) {
                                OnLocationChanged(EventArgs.Empty);
                        }

                        if (resized) {
                                OnSizeChanged(EventArgs.Empty);
                        }
                }

                protected void UpdateBounds(int x, int y, int width, int height, int clientWidth, int clientHeight) {
                        UpdateBounds(x, y, width, height);

                        this.client_size.Width=clientWidth;
                        this.client_size.Height=clientHeight;
                }

                public void Invalidate() {
                        Invalidate(ClientRectangle, false);
                }

                public void Invalidate(bool invalidateChildren) {
                        Invalidate(ClientRectangle, invalidateChildren);
                }

                public void Invalidate(System.Drawing.Rectangle rc) {
                        Invalidate(rc, false);
                }

                public void Invalidate(System.Drawing.Rectangle rc, bool invalidateChildren) {
                        if (!IsHandleCreated || !is_visible) {
                                return;
                        }

                        XplatUI.Invalidate(Handle, rc, false);

                        if (invalidateChildren) {
                                for (int i=0; i<child_controls.Count; i++) child_controls[i].Invalidate();
                        }
                }

                public void Invalidate(System.Drawing.Region region) {
                        Invalidate(region, false);
                }

                [MonoTODO]
                public void Invalidate(System.Drawing.Region region, bool invalidateChildren) {
                        throw new NotImplementedException();

                        // FIXME - should use the GetRegionScans function of the region to invalidate each area
                        if (invalidateChildren) {
                                for (int i=0; i<child_controls.Count; i++) child_controls[i].Invalidate();
                        }
                }

                [MonoTODO("BeginInvoke() : Figure out a cross-platform way to handle this")]
                public IAsyncResult BeginInvoke(Delegate method, object[] args) {       // ISynchronizeInvoke
                        IAsyncResult    result = null;

                        return result;
                }

                [MonoTODO]
                public object EndInvoke(IAsyncResult async_result) {                    // ISynchronizeInvoke
                        object result = null;

                        return result;
                }

                public void PerformLayout() {
                        PerformLayout(null, null);
                }

                public void PerformLayout(Control affectedControl, string affectedProperty) {
                        LayoutEventArgs levent = new LayoutEventArgs(affectedControl, affectedProperty);

                        if (layout_suspended>0) {
                                return;
                        }

                        // Prevent recursion
                        //in_layout=true;

                        // Prevent us from getting messed up
                        layout_suspended++;

                        // Perform all Dock and Anchor calculations
                        try {
                                Control         child;
                                AnchorStyles    anchor;
                                Rectangle       space;
                                int             diff_width;
                                int             diff_height;

                                space=this.DisplayRectangle;
                                diff_width=space.Width-prev_size.Width;
                                diff_height=space.Height-prev_size.Height;

                                // Deal with docking
                                for (int i=0; i < child_controls.Count; i++) {
                                        child=child_controls[i];
                                        switch (child.Dock) {
                                                case DockStyle.None: {
                                                        // Do nothing
                                                        break;
                                                }

                                                case DockStyle.Left: {
                                                        child.SetBounds(space.Left, space.Y, child.Width, space.Height);
                                                        space.X+=child.Width;
                                                        space.Width-=child.Width;
                                                        break;
                                                }

                                                case DockStyle.Top: {
                                                        child.SetBounds(space.Left, space.Y, space.Width, child.Height);
                                                        space.Y+=child.Height;
                                                        space.Height-=child.Height;
                                                        break;
                                                }
                                
                                                case DockStyle.Right: {
                                                        child.SetBounds(space.Right-child.Width, space.Y, child.Width, space.Height);
                                                        space.Width-=child.Width;
                                                        break;
                                                }

                                                case DockStyle.Bottom: {
                                                        child.SetBounds(space.Left, space.Bottom-child.Height, space.Width, child.Height);
                                                        space.Height-=child.Height;
                                                        break;
                                                }

                                                case DockStyle.Fill: {
                                                        child.SetBounds(space.Left, space.Top, space.Width, space.Height);
                                                        space.Width=0;
                                                        space.Height=0;
                                                        break;
                                                }
                                        }
                                }

                                space=this.DisplayRectangle;

                                // Deal with anchoring
                                for (int i=0; i < child_controls.Count; i++) {
                                        int left;
                                        int top;
                                        int width;
                                        int height;

                                        child=child_controls[i];
                                        anchor=child.Anchor;

                                        left=child.Left;
                                        top=child.Top;
                                        width=child.Width;
                                        height=child.Height;

                                        // If the control is docked we don't need to do anything
                                        if (child.Dock != DockStyle.None) {
                                                continue;
                                        }

                                        if ((anchor & AnchorStyles.Left) !=0 ) {
                                                if ((anchor & AnchorStyles.Right) != 0) {
                                                        // Anchoring to left and right
                                                        width=width+diff_width;
                                                } else {
                                                        ; // nothing to do
                                                }
                                        } else if ((anchor & AnchorStyles.Right) != 0) {
                                                left+=diff_width;
                                        } else {
                                                left+=diff_width/2;
                                        }

                                        if ((anchor & AnchorStyles.Top) !=0 ) {
                                                if ((anchor & AnchorStyles.Bottom) != 0) {
                                                        height+=diff_height;
                                                } else {
                                                        ; // nothing to do
                                                }
                                        } else if ((anchor & AnchorStyles.Bottom) != 0) {
                                                top+=diff_height;
                                        } else {
                                                top+=diff_height/2;
                                        }

                                        // Sanity
                                        if (width < 0) {
                                                width=0;
                                        }

                                        if (height < 0) {
                                                height=0;
                                        }

                                        child.SetBounds(left, top, width, height);
                                }

                                // Let everyone know
                                OnLayout(levent);
                        }

                        // Need to make sure we decremend layout_suspended
                        finally {
                                layout_suspended--;
                        }
                }

                public void ResumeLayout() 
                {
                        ResumeLayout (true);
                }

                public void ResumeLayout(bool peformLayout) 
                {
                        layout_suspended--;
                        
                        if (layout_suspended > 0 || peformLayout == false)
                                return;

                        PerformLayout();
                }

                
                public void SuspendLayout() 
                {
                        layout_suspended++;
                }

                public Point PointToClient (Point p)\r
                {\r
                        int x = p.X;\r
                        int y = p.Y;\r
\r
                        XplatUI.ScreenToClient (Handle, ref x, ref y);\r
\r
                        return new Point (x, y);\r
                }\r


                [MonoTODO]
                protected virtual void WndProc(ref Message m) {
                        EventArgs       e = new EventArgs();

#if debug
                        Console.WriteLine("Received message {0}", m);
#endif

                        switch((Msg)m.Msg) {
#if notyet
                                // Mouse handling
                                case Msg.WM_LBUTTONDBLCLK:      throw new NotImplementedException();    break;

                                case Msg.WM_RBUTTONDOWN:        throw new NotImplementedException();    break;
                                case Msg.WM_RBUTTONUP:          throw new NotImplementedException();    break;
                                case Msg.WM_RBUTTONDBLCLK:      throw new NotImplementedException();    break;

                                case Msg.WM_MOUSEHOVER:         throw new NotImplementedException();    break;
                                case Msg.WM_MOUSELEAVE:         throw new NotImplementedException();    break;
                                

                                // Keyboard handling
                                case Msg.WM_CHAR:               throw new NotImplementedException();    break;
                                case Msg.WM_KEYDOWN:            throw new NotImplementedException();    break;
                                case Msg.WM_KEYUP:              throw new NotImplementedException();    break;
#endif
                                // Window management
                                case Msg.WM_WINDOWPOSCHANGED: {
                                        UpdateBounds();
                                        DefWndProc(ref m);
                                        break;
                                }

                                case Msg.WM_PAINT: {
                                        Rectangle       rect;
                                        PaintEventArgs  paint_event;

                                        paint_event = XplatUI.PaintEventStart(Handle);
                                        OnPaint(paint_event);
                                        XplatUI.PaintEventEnd(Handle);
                                        DefWndProc(ref m);      
                                        break;
                                }
                                
                                case Msg.WM_ERASEBKGND:{                                        
                                        if (GetStyle (ControlStyles.UserPaint)){                                                
                                                PaintEventArgs eraseEventArgs = new PaintEventArgs (Graphics.FromHdc (m.WParam), new Rectangle (new Point (0,0),Size));
                                                OnPaintBackground (eraseEventArgs);                                                                                             
                                                m.Result = (IntPtr)1;
                                        }       
                                        else {
                                                m.Result = (IntPtr)0;
                                                DefWndProc (ref m);     
                                        }                                       
                                        
                                        break;
                                }
                                
                                case Msg.WM_LBUTTONUP: {                                        
                                        int clicks = 1;
                                        
                                        OnMouseUp (new MouseEventArgs (FromParamToMouseButtons ((int) m.WParam.ToInt32()), 
                                                        clicks, 
                                                        LowOrder ((int) m.LParam.ToInt32 ()), HighOrder ((int) m.LParam.ToInt32 ()), 
                                                        0));
                                        break;
                                }
                                
                                case Msg.WM_LBUTTONDOWN: {                                      
                                        int clicks = 1;
                                        
                                        OnMouseDown (new MouseEventArgs (FromParamToMouseButtons ((int) m.WParam.ToInt32()), 
                                                        clicks, LowOrder ((int) m.LParam.ToInt32 ()), HighOrder ((int) m.LParam.ToInt32 ()), 
                                                        0));
                                        
                                        break;
                                }

                                case Msg.WM_MOUSEWHEEL: {
                                        int clicks = 1;

                                        OnMouseWheel (new MouseEventArgs (FromParamToMouseButtons ((int) m.WParam.ToInt32()), 
                                                        clicks, LowOrder ((int) m.LParam.ToInt32 ()), HighOrder ((int) m.LParam.ToInt32 ()), 
                                                        HighOrder(m.WParam.ToInt32())));
                                        break;
                                }

                                
                                case Msg.WM_MOUSEMOVE: {                                        
                                        int clicks = 1;

                                        OnMouseMove  (new MouseEventArgs (FromParamToMouseButtons ((int) m.WParam.ToInt32()), 
                                                        clicks, 
                                                        LowOrder ((int) m.LParam.ToInt32 ()), HighOrder ((int) m.LParam.ToInt32 ()), 
                                                        0));
                                        break;
                                }

                                case Msg.WM_SIZE: {                                     
                                        if (GetStyle(ControlStyles.ResizeRedraw)) {
                                                Invalidate();
                                        }
                                        DefWndProc(ref m);      
                                        break;                          
                                }

                                case Msg.WM_KEYDOWN: {

                                        if (!ProcessKeyEventArgs (ref m))
                                                DefWndProc (ref m);

                                        break;                                  
                                }

                                case Msg.WM_KEYUP: {

                                        if (!ProcessKeyEventArgs (ref m))
                                                DefWndProc (ref m);

                                        break;                                  
                                }               
                                

#if notyet                              
                                case Msg.WM_WINDOWPOSCHANGED:   throw new NotImplementedException();    break;
                                case Msg.WM_SYSCOLORCHANGE:     throw new NotImplementedException();    break;
                                
#endif

                                default:
                                        DefWndProc(ref m);      
                                        break;
                        }
                        
                        
                        
                }
                #endregion      // Public Instance Methods


                #region         // Protected Instance Methods
                protected virtual void CreateHandle() {
                        if (IsDisposed) {
                                throw new ObjectDisposedException(Name);
                        }

                        if (IsHandleCreated) {
                                return;
                        }

                        if (window==null) {
                                window = new ControlNativeWindow(this);
                                window.CreateHandle(CreateParams);
                        }

                        if (window.Handle!=IntPtr.Zero) {
                                if (!controls.Contains(window.Handle)) {
                                        controls.Add(window.Handle, this);
                                }

                                creator_thread = Thread.CurrentThread;

                                OnHandleCreated(EventArgs.Empty);
                        }
                }

                protected virtual void DefWndProc(ref Message m) {
                        window.DefWndProc(ref m);
                }

                protected virtual void DestroyHandle() {
                        if (IsHandleCreated) {
                                if (Handle != IntPtr.Zero) {
                                        controls.Remove(Handle);
                                }

                                if (window != null) {
                                        window.DestroyHandle();
                                }
                        }
                }

                protected virtual bool ProcessKeyEventArgs (ref Message msg)
                {
                        KeyEventArgs key_event;

                        switch (msg.Msg) {
                        case (int)Msg.WM_KEYDOWN: {
                                key_event = new KeyEventArgs ((Keys)msg.WParam.ToInt32 ());
                                OnKeyDown (key_event);
                                return key_event.Handled;
                        }
                        case (int)Msg.WM_KEYUP: {
                                key_event = new KeyEventArgs ((Keys)msg.WParam.ToInt32 ());
                                OnKeyUp (key_event);
                                return key_event.Handled;
                        }

                        default:
                                break;
                        }

                        return false;
                }

                protected virtual bool IsInputKey (Keys keyData) 
                {
                        return false;
                }

                protected virtual bool ProcessDialogKey (Keys keyData)
                {
                        if (parent != null)
                                return Parent.ProcessDialogKey (keyData);

                        return false;
                }

                protected bool GetStyle(ControlStyles flag) {
                        return (control_style & flag) != 0;
                }

                protected virtual bool ProcessDialogChar(char charCode) {
                        throw new NotImplementedException();
                }

                protected virtual bool ProcessMnemonic(char charCode) {
                        throw new NotImplementedException();
                }

                protected void RecreateHandle() {
                        IEnumerator child = child_controls.GetEnumerator();

                        if (IsHandleCreated) {
                                DestroyHandle();
                                CreateHandle();

                                // FIXME ZOrder?

                                while (child.MoveNext()) {
                                        ((Control)child.Current).RecreateHandle();
                                }
                        }
                }

                protected virtual void ScaleCore(float dx, float dy) {
                        throw new NotImplementedException();
                }

                protected virtual void Select(bool directed, bool forward) {
                        throw new NotImplementedException();
                }

                protected virtual void SetBoundsCore(int x, int y, int width, int height, BoundsSpecified specified) {
                        // SetBoundsCore updates the Win32 control itself. UpdateBounds updates the controls variables and fires events, I'm guessing - pdb
                        if ((specified & BoundsSpecified.X) != BoundsSpecified.X) {
                                x = Left;
                        }

                        if ((specified & BoundsSpecified.Y) != BoundsSpecified.Y) {
                                y = Top;
                        }

                        if ((specified & BoundsSpecified.Width)!= BoundsSpecified.Width) {
                                width = Width;
                        }

                        if ((specified & BoundsSpecified.Height) != BoundsSpecified.Height) {
                                height = Height;
                        }

                        if (IsHandleCreated) {
                                XplatUI.SetWindowPos(Handle, x, y, width, height);
                        }

                        UpdateBounds(x, y, width, height);
                }

                protected virtual void SetClientSizeCore(int x, int y) {
                        // Calculate the actual window size from the client size (it usually stays the same or grows)
                        Rectangle       ClientRect;
                        Rectangle       WindowRect;
                        CreateParams    cp;

                        ClientRect = new Rectangle(0, 0, x, y);
                        cp = this.CreateParams;

                        if (XplatUI.CalculateWindowRect(Handle, ref ClientRect, cp.Style, false, out WindowRect)==false) {
                                return;
                        }

                        this.client_size = new Size(x, y);
                        SetBoundsCore(bounds.X, bounds.Y, WindowRect.Width, WindowRect.Height, BoundsSpecified.Size);
                }

                protected void SetStyle(ControlStyles flag, bool value) {
                        if (value) {
                                control_style |= flag;
                        } else {
                                control_style &= ~flag;
                        }
                }

                #endregion      // Public Instance Methods

                #region Private Instance Methods
                #endregion      // Private Instance Methods


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


                #region OnXXX methods
                protected virtual void OnBackColorChanged(EventArgs e) {
                        if (BackColorChanged!=null) BackColorChanged(this, e);
                        for (int i=0; i<child_controls.Count; i++) child_controls[i].OnParentBackColorChanged(e);
                }

                protected virtual void OnBackgroundImageChanged(EventArgs e) {
                        if (BackgroundImageChanged!=null) BackgroundImageChanged(this, e);
                        for (int i=0; i<child_controls.Count; i++) child_controls[i].OnParentBackgroundImageChanged(e);
                }

                protected virtual void OnBindingContextChanged(EventArgs e) {
                        if (BindingContextChanged!=null) BindingContextChanged(this, e);
                        for (int i=0; i<child_controls.Count; i++) child_controls[i].OnParentBindingContextChanged(e);
                }

                protected virtual void OnCausesValidationChanged(EventArgs e) {
                        if (CausesValidationChanged!=null) CausesValidationChanged(this, e);
                }

                protected virtual void OnChangeUICues(UICuesEventArgs e) {
                        if (CausesValidationChanged!=null) CausesValidationChanged(this, e);
                }

                protected virtual void OnClick(EventArgs e) {
                        if (Click!=null) Click(this, e);
                }

                protected virtual void OnContextMenuChanged(EventArgs e) {
                        if (ContextMenuChanged!=null) ContextMenuChanged(this, e);
                }

                protected virtual void OnControlAdded(ControlEventArgs e) {
                        if (ControlAdded!=null) ControlAdded(this, e);
                }

                protected virtual void OnControlRemoved(ControlEventArgs e) {
                        if (ControlRemoved!=null) ControlRemoved(this, e);
                }

                protected virtual void OnCreateControl() {
                }

                protected virtual void OnCursorChanged(EventArgs e) {
                        if (CursorChanged!=null) CursorChanged(this, e);
                }

                protected virtual void OnDockChanged(EventArgs e) {
                        if (DockChanged!=null) DockChanged(this, e);
                }

                protected virtual void OnDoubleClick(EventArgs e) {
                        if (DoubleClick!=null) DoubleClick(this, e);
                }

                protected virtual void OnDragDrop(DragEventArgs drgevent) {
                        if (DragDrop!=null) DragDrop(this, drgevent);
                }

                protected virtual void OnDragEnter(DragEventArgs drgevent) {
                        if (DragEnter!=null) DragEnter(this, drgevent);
                }

                protected virtual void OnDragLeave(EventArgs e) {
                        if (DragLeave!=null) DragLeave(this, e);
                }

                protected virtual void OnDragOver(DragEventArgs drgevent) {
                        if (DragOver!=null) DragOver(this, drgevent);
                }

                protected virtual void OnEnabledChanged(EventArgs e) {
                        if (EnabledChanged!=null) EnabledChanged(this, e);
                        for (int i=0; i<child_controls.Count; i++) child_controls[i].OnParentEnabledChanged(e);
                }

                protected virtual void OnEnter(EventArgs e) {
                        if (Enter!=null) Enter(this, e);
                }

                protected virtual void OnFontChanged(EventArgs e) {
                        if (FontChanged!=null) FontChanged(this, e);
                }

                protected virtual void OnForeColorChanged(EventArgs e) {
                        if (ForeColorChanged!=null) ForeColorChanged(this, e);
                        for (int i=0; i<child_controls.Count; i++) child_controls[i].OnParentForeColorChanged(e);
                }

                protected virtual void OnGiveFeedback(GiveFeedbackEventArgs gfbevent) {
                        if (GiveFeedback!=null) GiveFeedback(this, gfbevent);
                }
                
                protected virtual void OnGotFocus(EventArgs e) {
                        if (GotFocus!=null) GotFocus(this, e);
                }

                protected virtual void OnHandleCreated(EventArgs e) {
                        if (HandleCreated!=null) HandleCreated(this, e);
                }

                protected virtual void OnHandleDestroyed(EventArgs e) {
                        if (HandleDestroyed!=null) HandleDestroyed(this, e);
                }

                protected virtual void OnHelpRequested(HelpEventArgs hevent) {
                        if (HelpRequested!=null) HelpRequested(this, hevent);
                }

                protected virtual void OnImeModeChanged(EventArgs e) {
                        if (ImeModeChanged!=null) ImeModeChanged(this, e);
                }

                protected virtual void OnInvalidated(InvalidateEventArgs e) {
                        if (Invalidated!=null) Invalidated(this, e);
                }


                protected virtual void OnKeyDown(KeyEventArgs e) {                      
                        if (KeyDown!=null) KeyDown(this, e);
                }

                protected virtual void OnKeyUp(KeyEventArgs e) {
                        if (KeyUp!=null) KeyUp(this, e);
                }

                protected virtual void OnLayout(LayoutEventArgs levent) {
                        if (Layout!=null) Layout(this, levent);
                }

                protected virtual void OnLeave(EventArgs e) {
                        if (Leave!=null) Leave(this, e);
                }

                protected virtual void OnLocationChanged(EventArgs e) {
                        if (LocationChanged!=null) LocationChanged(this, e);
                }

                protected virtual void OnLostFocus(EventArgs e) {
                        if (LostFocus!=null) LostFocus(this, e);
                }

                protected virtual void OnMouseDown(MouseEventArgs e) {
                        if (MouseDown!=null) MouseDown(this, e);
                }

                protected virtual void OnMouseEnter(EventArgs e) {
                        if (MouseEnter!=null) MouseEnter(this, e);
                }

                protected virtual void OnMouseHover(EventArgs e) {
                        if (MouseHover!=null) MouseHover(this, e);
                }

                protected virtual void OnMouseLeave(EventArgs e) {
                        if (MouseLeave!=null) MouseLeave(this, e);
                }

                protected virtual void OnMouseMove(MouseEventArgs e) {                  
                        if (MouseMove!=null) MouseMove(this, e);
                }

                protected virtual void OnMouseUp(MouseEventArgs e) {
                        if (MouseUp!=null) MouseUp(this, e);
                }

                protected virtual void OnMouseWheel(MouseEventArgs e) {
                        if (MouseWheel!=null) MouseWheel(this, e);
                }

                protected virtual void OnMove(EventArgs e) {
                        if (Move!=null) Move(this, e);
                }

                protected virtual void OnNotifyMessage(Message m) {
                        // Override me!
                }

                protected virtual void OnPaint(PaintEventArgs e) {
                        if (Paint!=null) Paint(this, e);
                }

                protected virtual void OnPaintBackground(PaintEventArgs pevent) {
                        // Override me!
                }

                protected virtual void OnParentBackColorChanged(EventArgs e) {
                        if (background_color.IsEmpty && background_image==null) {
                                Invalidate();
                                OnBackColorChanged(e);
                        }
                }

                protected virtual void OnParentBackgroundImageChanged(EventArgs e) {
                        if (background_color.IsEmpty && background_image==null) {
                                Invalidate();
                                OnBackgroundImageChanged(e);
                        }
                }

                protected virtual void OnParentBindingContextChanged(EventArgs e) {
                        if (binding_context==null) {
                                binding_context=Parent.binding_context;
                                OnBindingContextChanged(e);
                        }
                }

                protected virtual void OnParentChanged(EventArgs e) {
                        if (ParentChanged!=null) ParentChanged(this, e);
                }

                protected virtual void OnParentEnabledChanged(EventArgs e) {
                        if ((is_enabled && !Parent.is_enabled) || (!is_enabled && Parent.is_enabled)) {
                                is_enabled=false;
                                Invalidate();
                                EnabledChanged(this, e);
                        }
                }

                protected virtual void OnParentFontChanged(EventArgs e) {
                        if (font==null) {
                                Invalidate();
                                OnFontChanged(e);
                        }
                }

                protected virtual void OnParentForeColorChanged(EventArgs e) {
                        if (foreground_color.IsEmpty) {
                                Invalidate();
                                OnForeColorChanged(e);
                        }
                }

                protected virtual void OnParentRightToLeftChanged(EventArgs e) {
                        if (right_to_left==RightToLeft.Inherit) {
                                Invalidate();
                                OnRightToLeftChanged(e);
                        }
                }

                protected virtual void OnParentVisibleChanged(EventArgs e) {
                        if (is_visible!=Parent.is_visible) {
                                is_visible=false;
                                Invalidate();
                                OnVisibleChanged(e);
                        }
                }

                protected virtual void OnQueryContinueDrag(QueryContinueDragEventArgs e) {
                        if (QueryContinueDrag!=null) QueryContinueDrag(this, e);
                }

                protected virtual void OnResize(EventArgs e) {
                        if (Resize!=null) Resize(this, e);

                        PerformLayout(this, "bounds");

                        // Do we need to let our parent regenerate it's layout thing since we resized?
                }

                protected virtual void OnRightToLeftChanged(EventArgs e) {
                        if (RightToLeftChanged!=null) RightToLeftChanged(this, e);
                        for (int i=0; i<child_controls.Count; i++) child_controls[i].OnParentRightToLeftChanged(e);
                }

                protected virtual void OnSizeChanged(EventArgs e) {                     
                        OnResize(e);
                        if (SizeChanged!=null) SizeChanged(this, e);
                }

                protected virtual void OnStyleChanged(EventArgs e) {
                        if (StyleChanged!=null) StyleChanged(this, e);
                }

                protected virtual void OnSystemColorsChanged(EventArgs e) {
                        if (SystemColorsChanged!=null) SystemColorsChanged(this, e);
                }

                protected virtual void OnTabIndexChanged(EventArgs e) {
                        if (TabIndexChanged!=null) TabIndexChanged(this, e);
                }

                protected virtual void OnTabStopChanged(EventArgs e) {
                        if (TabStopChanged!=null) TabStopChanged(this, e);
                }

                protected virtual void OnTextChanged(EventArgs e) {
                        if (TextChanged!=null) TextChanged(this, e);
                }

                protected virtual void OnValidated(EventArgs e) {
                        if (Validated!=null) Validated(this, e);
                }

                protected virtual void OnValidating(System.ComponentModel.CancelEventArgs e) {
                        if (Validating!=null) Validating(this, e);
                }

                protected virtual void OnVisibleChanged(EventArgs e) {
                        if (!is_visible) {
                                if (dc_mem!=null) {
                                        dc_mem.Dispose ();
                                        bmp_mem=null;
                                }

                                if (bmp_mem!=null) {
                                        bmp_mem.Dispose();
                                        bmp_mem=null;
                                }
                        } else {
                                if (!is_disposed) {
                                        if (!this.IsHandleCreated) {
                                                this.CreateHandle();
                                        }
                                        PerformLayout();
                                }
                        }
                        
                        if (VisibleChanged!=null) VisibleChanged(this, e);

                        // We need to tell our kids
                        for (int i=0; i<child_controls.Count; i++) {
                                child_controls[i].OnParentVisibleChanged(e);
                        }
                }
                #endregion      // OnXXX methods

                #region Events
                public event EventHandler               BackColorChanged;
                public event EventHandler               BackgroundImageChanged;
                public event EventHandler               BindingContextChanged;
                public event EventHandler               CausesValidationChanged;
                public event UICuesEventHandler         ChangeUICues;
                public event EventHandler               Click;
                public event EventHandler               ContextMenuChanged;
                public event ControlEventHandler        ControlAdded;
                public event ControlEventHandler        ControlRemoved;
                public event EventHandler               CursorChanged;
                public event EventHandler               DockChanged;
                public event EventHandler               DoubleClick;
                public event DragEventHandler           DragDrop;
                public event DragEventHandler           DragEnter;
                public event EventHandler               DragLeave;
                public event DragEventHandler           DragOver;
                public event EventHandler               EnabledChanged;
                public event EventHandler               Enter;
                public event EventHandler               FontChanged;
                public event EventHandler               ForeColorChanged;
                public event GiveFeedbackEventHandler   GiveFeedback;
                public event EventHandler               GotFocus;
                public event EventHandler               HandleCreated;
                public event EventHandler               HandleDestroyed;
                public event HelpEventHandler           HelpRequested;
                public event EventHandler               ImeModeChanged;
                public event InvalidateEventHandler     Invalidated;
                public event KeyEventHandler            KeyDown;
                public event KeyPressEventHandler       KeyPress;
                public event KeyEventHandler            KeyUp;
                public event LayoutEventHandler         Layout;
                public event EventHandler               Leave;
                public event EventHandler               LocationChanged;
                public event EventHandler               LostFocus;
                public event MouseEventHandler          MouseDown;
                public event EventHandler               MouseEnter;
                public event EventHandler               MouseHover;
                public event EventHandler               MouseLeave;
                public event MouseEventHandler          MouseMove;
                public event MouseEventHandler          MouseUp;
                public event MouseEventHandler          MouseWheel;
                public event EventHandler               Move;
                public event PaintEventHandler          Paint;
                public event EventHandler               ParentChanged;
                public event QueryAccessibilityHelpEventHandler QueryAccessibilityHelp;
                public event QueryContinueDragEventHandler      QueryContinueDrag;
                public event EventHandler               Resize;
                public event EventHandler               RightToLeftChanged;
                public event EventHandler               SizeChanged;
                public event EventHandler               StyleChanged;
                public event EventHandler               SystemColorsChanged;
                public event EventHandler               TabIndexChanged;
                public event EventHandler               TabStopChanged;
                public event EventHandler               TextChanged;
                public event EventHandler               Validated;
                public event CancelEventHandler         Validating;
                public event EventHandler               VisibleChanged;
                #endregion      // Events
                
                #region Private Methods
                internal static int LowOrder (int param) 
                {
                        return (param & 0xffff);
                }

                internal static int HighOrder (int param) 
                {
                        return (param >> 16);
                }
                
                internal static MouseButtons FromParamToMouseButtons (int param) 
                {               
                        MouseButtons buttons = MouseButtons.None;
                                        
                        if ((param & (int) MsgButtons.MK_LBUTTON) != 0)
                                buttons |= MouseButtons.Left;
                        
                        if ((param & (int) MsgButtons.MK_MBUTTON) != 0)
                                buttons |= MouseButtons.Middle;
                                
                        if ((param & (int) MsgButtons.MK_RBUTTON) != 0)
                                buttons |= MouseButtons.Right;          
                                
                        return buttons;

                }
                #endregion      
        }
}