ControlDesigner.cs :  » 2.6.4-mono-.net-core » System.Windows.Forms » System » Windows » Forms » Design » C# / CSharp Open Source

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C# / CSharp Open Source » 2.6.4 mono .net core » System.Windows.Forms 
System.Windows.Forms » System » Windows » Forms » Design » ControlDesigner.cs
//
// System.Windows.Forms.Design.ControlDesigner
//
// Authors:
//    Ivan N. Zlatev (contact i-nZ.net)
//
// (C) 2006-2007 Ivan N. Zlatev

//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//


using System;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using System.Drawing;
using System.Drawing.Design;
using System.Collections;
#if NET_2_0
using System.Windows.Forms.Design.Behavior;
#endif

namespace System.Windows.Forms.Design{
  public class ControlDesigner : ComponentDesigner, IMessageReceiver
  {
    

    private WndProcRouter _messageRouter;
    private bool _locked = false;
    private bool _mouseDown = false;
    private bool _mouseMoveAfterMouseDown = false;
    private bool _mouseDownFirstMove = false;
    private bool _firstMouseMoveInClient = true;

    public ControlDesigner ()
    {
    }

#region Initialization
    public override void Initialize (IComponent component)
    {
      base.Initialize (component);

      if (!(component is Control))
        throw new ArgumentException ("Component is not a Control.");

      Control.Text = component.Site.Name;
      _messageRouter = new WndProcRouter ((Control) component, (IMessageReceiver) this);
      Control.WindowTarget = _messageRouter;

      // DT properties
      //
      this.Visible = true;
      this.Enabled = true;
      this.Locked = false;
      this.AllowDrop = false;
      //
      // The control properties
      //
      Control.Enabled = true;
      Control.Visible = true;
      Control.AllowDrop = false;

      this.Control.DragDrop += new DragEventHandler (OnDragDrop);
      this.Control.DragEnter += new DragEventHandler (OnDragEnter);
      this.Control.DragLeave += new EventHandler (OnDragLeave);
      this.Control.DragOver += new DragEventHandler (OnDragOver);

      // XXX: The control already has a handle?
      //
      if (Control.IsHandleCreated)
        OnCreateHandle ();

    }

    // The default implementation of this method sets the component's Text property to
    // its name (Component.Site.Name), if the property field is of type string.
    //
    public override void OnSetComponentDefaults ()
    {
      if (this.Component != null && this.Component.Site != null) {
        PropertyDescriptor propertyDescriptor = TypeDescriptor.GetProperties (this.Component)["Text"];
        if (propertyDescriptor != null && !propertyDescriptor.IsReadOnly &&
          propertyDescriptor.PropertyType == typeof (string)) {
          propertyDescriptor.SetValue (Component, Component.Site.Name);
        }
      }
    }
#endregion


#region Properties and Fields - AccessabilityObject Left
    protected static readonly Point InvalidPoint = new Point (int.MinValue, int.MinValue);

#if NET_2_0
    protected internal BehaviorService BehaviorService {
      get { throw new NotImplementedException (); }
    }
#endif

    public virtual Control Control {
      get { return (Control) base.Component; }
    }

    protected virtual bool EnableDragRect {
      get { return true; }
    }

    public virtual SelectionRules SelectionRules {
      get {
        if (this.Control == null)
          return SelectionRules.None;

        // all controls on the surface are visible
        //
        SelectionRules selectionRules = SelectionRules.Visible;

        if ((bool)GetValue (this.Component, "Locked") == true) {
          selectionRules |= SelectionRules.Locked;
        }
        else {
          DockStyle dockStyle = (DockStyle) this.GetValue (base.Component, "Dock", typeof (DockStyle));

          switch (dockStyle) {
            case DockStyle.Top:
              selectionRules |= SelectionRules.BottomSizeable;
              break;
            case DockStyle.Left:
              selectionRules |= SelectionRules.RightSizeable;
              break;
            case DockStyle.Right:
              selectionRules |= SelectionRules.LeftSizeable;
              break;
            case DockStyle.Bottom:
              selectionRules |= SelectionRules.TopSizeable;
              break;
            case DockStyle.Fill:
              break;
            default:
              selectionRules |= SelectionRules.Moveable;
              selectionRules |= SelectionRules.AllSizeable;
              break;
          }
        }

        return selectionRules;
      }
    }

    public override ICollection AssociatedComponents {
      get {
        ArrayList components = new ArrayList ();
        foreach (Control c in this.Control.Controls)
          if (c.Site != null)
            components.Add (c);
        return components;
      }
    }

#if NET_2_0
    protected override IComponent ParentComponent {
      get { return this.GetValue (this.Control,  "Parent") as Control;}
    }
#endif
    // TODO: implement ControlDesigner.ControlAccessabilityObject
    //
    public virtual AccessibleObject AccessibilityObject {
      get {
        if (accessibilityObj == null)
          accessibilityObj = new AccessibleObject ();

        return accessibilityObj;
      }
    }
    protected AccessibleObject accessibilityObj;

#endregion


#region WndProc
  
    protected void DefWndProc (ref Message m)
    {
      _messageRouter.ToControl (ref m);
    }
    
    protected void BaseWndProc (ref Message m)
    {
      _messageRouter.ToSystem (ref m);
    }
    
    void IMessageReceiver.WndProc (ref Message m)
    {
      this.WndProc (ref m);
    }
    
    // Keep in mind that messages are recieved for the child controls if routed
    //
    protected virtual void WndProc (ref Message m)
    {
      // Filter out kb input
      //
      if ((Native.Msg) m.Msg >= Native.Msg.WM_KEYFIRST &&  (Native.Msg) m.Msg <= Native.Msg.WM_KEYLAST)
        return;

      // Mouse messages should be routed the control, if GetHitTest (virtual) returns true.
      //
      if (IsMouseMessage ((Native.Msg) m.Msg) &&
          this.GetHitTest (new Point (Native.LoWord((int) m.LParam), Native.HiWord (((int) m.LParam))))) {
        
        this.DefWndProc (ref m);
        return;
      }

      switch ((Native.Msg) m.Msg) {
        case Native.Msg.WM_CREATE:
          this.DefWndProc (ref m);
          if (m.HWnd == this.Control.Handle)
            OnCreateHandle ();
          break;

        case Native.Msg.WM_CONTEXTMENU:
          OnContextMenu (Native.LoWord ((int) m.LParam), Native.HiWord ((int) m.LParam));
          break;

        case Native.Msg.WM_SETCURSOR:
          if (this.GetHitTest (new Point (Native.LoWord ((int) m.LParam), Native.HiWord ((int) m.LParam))))
            this.DefWndProc (ref m);
          else
            OnSetCursor ();
          break;

        case Native.Msg.WM_SETFOCUS:
          this.DefWndProc (ref m);
          break;
        
        case Native.Msg.WM_PAINT:
          // Wait for control's WM_PAINT to complete first.
          //
          this.DefWndProc (ref m);

          Graphics gfx = Graphics.FromHwnd (m.HWnd);
          PaintEventArgs args = new PaintEventArgs (gfx, this.Control.Bounds);
          OnPaintAdornments (args);
          gfx.Dispose ();
          args.Dispose ();
          break;

        case Native.Msg.WM_NCRBUTTONDOWN:
        case Native.Msg.WM_NCLBUTTONDOWN:
        case Native.Msg.WM_NCMBUTTONDOWN:
        case Native.Msg.WM_NCLBUTTONDBLCLK:
        case Native.Msg.WM_NCRBUTTONDBLCLK:
          break;

        case Native.Msg.WM_LBUTTONDBLCLK:
        case Native.Msg.WM_RBUTTONDBLCLK:
        case Native.Msg.WM_MBUTTONDBLCLK:
          if ((Native.Msg)m.Msg == Native.Msg.WM_LBUTTONDBLCLK)
            _mouseButtonDown = MouseButtons.Left;
          else if ((Native.Msg)m.Msg == Native.Msg.WM_RBUTTONDBLCLK)
            _mouseButtonDown = MouseButtons.Right;
          else if ((Native.Msg)m.Msg == Native.Msg.WM_MBUTTONDBLCLK)
            _mouseButtonDown = MouseButtons.Middle;
          OnMouseDoubleClick ();
          this.BaseWndProc (ref m);
          break;

        case Native.Msg.WM_MOUSEHOVER:
          OnMouseHover ();
          break;
        
        case Native.Msg.WM_LBUTTONDOWN:
        case Native.Msg.WM_RBUTTONDOWN:     
        case Native.Msg.WM_MBUTTONDOWN:
          _mouseMoveAfterMouseDown = true;
          if ((Native.Msg)m.Msg == Native.Msg.WM_LBUTTONDOWN)
            _mouseButtonDown = MouseButtons.Left;
          else if ((Native.Msg)m.Msg == Native.Msg.WM_RBUTTONDOWN)
            _mouseButtonDown = MouseButtons.Right;
          else if ((Native.Msg)m.Msg == Native.Msg.WM_MBUTTONDOWN)
            _mouseButtonDown = MouseButtons.Middle;
        
          if (_firstMouseMoveInClient) {
            OnMouseEnter ();
            _firstMouseMoveInClient = false;
          }
          this.OnMouseDown (Native.LoWord ((int)m.LParam), Native.HiWord ((int)m.LParam));
          this.BaseWndProc (ref m);
          break;

        case Native.Msg.WM_MOUSELEAVE:
          _firstMouseMoveInClient = false;
          OnMouseLeave ();
          this.BaseWndProc (ref m);
          break;

        // The WM_CANCELMODE message is sent to cancel certain modes, such as mouse capture.
        // For example, the system sends this message to the active window when a dialog box
        // or message box is displayed. Certain functions also send this message explicitly to
        // the specified window regardless of whether it is the active window. For example,
        // the EnableWindow function sends this message when disabling the specified window.
        //
        case Native.Msg.WM_CANCELMODE:
          OnMouseDragEnd (true);
          this.DefWndProc (ref m);
          break;

        case Native.Msg.WM_LBUTTONUP:
        case Native.Msg.WM_RBUTTONUP:
        case Native.Msg.WM_NCLBUTTONUP:
        case Native.Msg.WM_NCRBUTTONUP:
        case Native.Msg.WM_MBUTTONUP:  
        case Native.Msg.WM_NCMBUTTONUP:
          _mouseMoveAfterMouseDown = false; // just in case
          this.OnMouseUp ();
          this.BaseWndProc (ref m);
          break;

        // // MWF Specific msg! - must reach control
        // //
        // case Native.Msg.WM_MOUSE_ENTER:
        //   _firstMouseMoveInClient = false; // just so that nothing will get fired in WM_MOUSEMOVE
        //   OnMouseEnter ();
        //   this.DefWndProc (ref m);
        //   break;

        // FIXME: The first MOUSEMOVE after WM_MOUSEDOWN should be ingored
        //
        case Native.Msg.WM_MOUSEMOVE:
          if (_mouseMoveAfterMouseDown) { // mousemove is send after each mousedown so ignore that
            _mouseMoveAfterMouseDown = false;
            this.BaseWndProc (ref m);
            return;
          }
          // If selection is in progress pass the mouse move msg to the primary selection.
          // If resizing is in progress pass to the parent of the primary selection (remmember that the selection
          // frame is not a control and is drawn in the parent of the primary selection).
          //
          // Required in order for those 2 operations to continue when the mouse is moving over a control covering
          // the one where the action takes place.
          // 
          IUISelectionService uiSelectionServ = this.GetService (typeof (IUISelectionService)) as IUISelectionService;
          ISelectionService selectionServ = this.GetService (typeof (ISelectionService)) as ISelectionService;
          IDesignerHost host = this.GetService (typeof (IDesignerHost)) as IDesignerHost;
          

          if (uiSelectionServ != null && selectionServ != null && host != null) {
            Control primarySelection = selectionServ.PrimarySelection as Control;
            Point location = new Point (Native.LoWord ((int)m.LParam), Native.HiWord ((int)m.LParam));

            if (uiSelectionServ.SelectionInProgress &&
              this.Component != host.RootComponent && 
              this.Component != selectionServ.PrimarySelection) {

              location = primarySelection.PointToClient (this.Control.PointToScreen (location));
              Native.SendMessage (primarySelection.Handle, (Native.Msg)m.Msg, m.WParam, Native.LParam (location.X, location.Y));
            }
            else if (uiSelectionServ.ResizeInProgress && 
               // this.Component != host.RootComponent && 
              this.Control.Parent == ((Control)selectionServ.PrimarySelection).Parent) {

              location = this.Control.Parent.PointToClient (this.Control.PointToScreen (location));
              Native.SendMessage (this.Control.Parent.Handle, (Native.Msg)m.Msg, m.WParam, Native.LParam (location.X, location.Y));
            }
            else {
              this.OnMouseMove (location.X, location.Y);
            }
          }
          else {
            this.OnMouseMove (Native.LoWord ((int)m.LParam), Native.HiWord ((int)m.LParam));
          }
          this.BaseWndProc (ref m);
          break;

        default:
          // Pass everything else to the control and return
          //
          this.DefWndProc (ref m);
          break;
      }
    }
    
    // Indicates whether a mouse click at the specified point should be handled by the control.
    //
    protected virtual bool GetHitTest (Point point)
    {
      return false;
    }

    private bool IsMouseMessage (Native.Msg msg)
    {
      if (msg >= Native.Msg.WM_MOUSEFIRST && msg <= Native.Msg.WM_MOUSELAST)
        return true;
      else if (msg >= Native.Msg.WM_NCLBUTTONDOWN && msg <= Native.Msg.WM_NCMBUTTONDBLCLK)
        return true;
      else if (msg == Native.Msg.WM_MOUSEHOVER || msg == Native.Msg.WM_MOUSELEAVE)
        return true;
      else
        return false;
    }
#endregion


#region WndProc Message Handlers

    protected virtual void OnSetCursor ()
    {
    }

    // Raises the DoDefaultAction.
    //
    private void OnMouseDoubleClick ()
    {
      try {
        base.DoDefaultAction ();
      }
      catch (Exception e) {
        this.DisplayError (e);
      }
    }

    internal virtual void OnMouseDown (int x, int y)
    {
      _mouseDown = true;
      _mouseDownFirstMove = true;
      IUISelectionService uiSelection = this.GetService (typeof (IUISelectionService)) as IUISelectionService;
      if (uiSelection != null && uiSelection.AdornmentsHitTest (this.Control, x, y)) {
        // 1) prevent primary selection from being changed at this point.
        // 2) delegate behaviour in the future to the IUISelectionService
      }
      else {
        ISelectionService selectionService = this.GetService (typeof (ISelectionService)) as ISelectionService;
        if (selectionService != null) {
          selectionService.SetSelectedComponents (new IComponent[] { this.Component });
        }
      }
    }

    // Note that this is a pure WM_MOUSEMOVE acceptor
    //
    internal virtual void OnMouseMove (int x, int y)
    {
      if (_mouseDown) {
        if (_mouseDownFirstMove) {
          OnMouseDragBegin (x, y);
          _mouseDownFirstMove = false;
        }
        else {
          OnMouseDragMove (x, y);
        }
      }

    }

    internal virtual void OnMouseUp ()
    {
      IUISelectionService uiSelection = this.GetService (typeof (IUISelectionService)) as IUISelectionService;

      if (_mouseDown) {
        this.OnMouseDragEnd (false);
        if (uiSelection != null && (uiSelection.SelectionInProgress || uiSelection.ResizeInProgress)) {
          uiSelection.MouseDragEnd (false);
        }
        _mouseDown = false;
      }
      else {        
        if (uiSelection != null && (uiSelection.SelectionInProgress || uiSelection.ResizeInProgress)) { 
          // If the mouse up happens over the a control which is not defacto participating in 
          // the selection or resizing in progress, then inform the IUISelectionService of that event
          //
          uiSelection.MouseDragEnd (false);
        }
      }
    }

    protected virtual void OnContextMenu (int x, int y)
    {
      IMenuCommandService service = this.GetService (typeof(IMenuCommandService)) as IMenuCommandService;
      if (service != null) {
        service.ShowContextMenu (MenuCommands.SelectionMenu, x, y);
      }
    }

    protected virtual void OnMouseEnter ()
    {
    }

    protected virtual void OnMouseHover ()
    {
    }

    protected virtual void OnMouseLeave ()
    {
    }

    // Provides an opportunity to perform additional processing immediately
    // after the control handle has been created.
    //
    protected virtual void OnCreateHandle ()
    {
    }

    // Called after the control is done with the painting so that the designer host
    // can paint stuff over it.
    //
    protected virtual void OnPaintAdornments (PaintEventArgs pe)
    {
    }
#endregion


#region Mouse Dragging

    MouseButtons _mouseButtonDown;

    internal MouseButtons MouseButtonDown {
      get { return _mouseButtonDown;  }
    }

    protected virtual void OnMouseDragBegin (int x, int y)
    {
      IUISelectionService selectionServ = this.GetService (typeof (IUISelectionService)) as IUISelectionService;
      if (selectionServ != null && ((this.SelectionRules & SelectionRules.Moveable) == SelectionRules.Moveable)) {
        // once this is fired the parent control (parentcontroldesigner) will start getting dragover events.
        //
        selectionServ.DragBegin ();
      }
    }

    protected virtual void OnMouseDragMove (int x, int y)
    {
    }
    
    protected virtual void OnMouseDragEnd (bool cancel)
    {
    }
#endregion

    
#region Parenting
    protected void HookChildControls (Control firstControl)
    {
      if (firstControl != null) {
        foreach (Control control in firstControl.Controls) {
          control.WindowTarget = (IWindowTarget) new WndProcRouter (control, (IMessageReceiver) this);
        }
      }
    }

    protected void UnhookChildControls (Control firstControl)
    {
      if (firstControl != null) {
        foreach (Control control in firstControl.Controls) {
          if (control.WindowTarget is WndProcRouter)
            ((WndProcRouter) control.WindowTarget).Dispose ();
        }
      }
    }

    // Someone please tell me why the hell is this method here?
    // What about having ParentControlDesigner.CanParent(...) ?
    // 
    public virtual bool CanBeParentedTo (IDesigner parentDesigner)
    {
      IDesignerHost host = this.GetService (typeof (IDesignerHost)) as IDesignerHost;

      if (parentDesigner is ParentControlDesigner &&
        this.Component != host.RootComponent &&
        !this.Control.Controls.Contains (((ParentControlDesigner)parentDesigner).Control)) {
          return true;
      } else {
        return false;
      }
    }
#endregion

    protected void DisplayError (Exception e)
    {
      if (e != null) {
        IUIService uiService = GetService (typeof (IUIService)) as IUIService;
        if (uiService != null) {
          uiService.ShowError (e);
        }
        else {
          string errorText = e.Message;
          if (errorText == null ||  errorText == String.Empty)
            errorText = e.ToString ();
          MessageBox.Show (Control, errorText, "Error", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
        }
      }
    }

#region Drag and Drop handling

    // Enables or disables Drag and Drop
    //
    protected void EnableDragDrop(bool value)
    {
      if (this.Control != null) {
        if (value) {
          Control.DragDrop += new DragEventHandler (OnDragDrop);
          Control.DragOver += new DragEventHandler (OnDragOver);
          Control.DragEnter += new DragEventHandler (OnDragEnter);
          Control.DragLeave += new EventHandler (OnDragLeave);
          Control.GiveFeedback += new GiveFeedbackEventHandler (OnGiveFeedback);
          Control.AllowDrop = true;
        }
        else {
          Control.DragDrop -= new DragEventHandler (OnDragDrop);
          Control.DragOver -= new DragEventHandler (OnDragOver);
          Control.DragEnter -= new DragEventHandler (OnDragEnter);
          Control.DragLeave -= new EventHandler (OnDragLeave);
          Control.GiveFeedback -= new GiveFeedbackEventHandler (OnGiveFeedback);
          Control.AllowDrop = false;
        }
      }
    }

    private void OnGiveFeedback (object sender, GiveFeedbackEventArgs e)
    {
      OnGiveFeedback (e);
    }

    private void OnDragDrop (object sender, DragEventArgs e)
    {
      OnDragDrop (e);
    }

    private void OnDragEnter (object sender, DragEventArgs e)
    {
      OnDragEnter (e);
    }

    private void OnDragLeave (object sender, EventArgs e)
    {
      OnDragLeave (e);
    }

    private void OnDragOver (object sender, DragEventArgs e)
    {
      OnDragOver (e);
    }

    protected virtual void OnGiveFeedback (GiveFeedbackEventArgs e)
    {
      e.UseDefaultCursors = false;
    }

    protected virtual void OnDragDrop (DragEventArgs e)
    {
    }

    protected virtual void OnDragEnter (DragEventArgs e)
    {
    }

    protected virtual void OnDragLeave (EventArgs e)
    {
    }

    protected virtual void OnDragOver (DragEventArgs e)
    {
    }
#endregion


#region Redirected Properties

    // This IDesignerFilter interface method override adds a set of properties
    // to this designer's component at design time. This method adds the following
    // browsable properties: "Visible", "Enabled", "ContextMenu", "AllowDrop", "Location",
    // "Name", "Controls", and "Locked".
    //
    // XXX: We aren't redirecting Controls
    // 
    protected override void PreFilterProperties (IDictionary properties)
    {
      base.PreFilterProperties (properties);

      string[] newProperties = {
        "Visible", "Enabled", "ContextMenu", "AllowDrop", "Location", "Name",
      };

      Attribute[][] attributes = { 
        new Attribute[] { new DefaultValueAttribute (true) },
        new Attribute[] { new DefaultValueAttribute (true) },
        new Attribute[] { new DefaultValueAttribute (null) },
        new Attribute[] { new DefaultValueAttribute (false) },
        new Attribute[] { new DefaultValueAttribute (typeof (Point), "0, 0") },
        new Attribute[] {}
       };
      
      PropertyDescriptor propertyDescriptor = null;

      // If existing redirect each property to the ControlDesigner.
      //
      for (int i=0; i < newProperties.Length; i++) {
        propertyDescriptor = properties[newProperties[i]] as PropertyDescriptor;
        if (propertyDescriptor != null)
          properties[newProperties[i]] = TypeDescriptor.CreateProperty (typeof (ControlDesigner),
                              propertyDescriptor,
                              attributes[i]);
      }

      // This one is a must to have.
      //
      properties["Locked"] = TypeDescriptor.CreateProperty (typeof (ControlDesigner), "Locked",
                      typeof(bool),
                      new Attribute[] {
                        DesignOnlyAttribute.Yes,
                        BrowsableAttribute.Yes,
                        CategoryAttribute.Design,
                        new DefaultValueAttribute (false),
                        new DescriptionAttribute("The Locked property determines if we can move or resize the control.")
                      });

    }

    // ShadowProperties returns the real property value if there is no "shadow" one set
    // Welcome to the land of shadows... :-)
    //
    private bool Visible {
      get { return (bool) base.ShadowProperties["Visible"]; }
      set { base.ShadowProperties["Visible"] = value; }
    }

    private bool Enabled {
      get { return (bool) base.ShadowProperties["Enabled"]; }
      set { base.ShadowProperties["Enabled"] = value; }
    }

    private bool Locked {
      get { return _locked; }
      set { _locked = value; }
    }

    private bool AllowDrop {
      get { return (bool)base.ShadowProperties["AllowDrop"]; }
      set { base.ShadowProperties["AllowDrop"] = value; }
    }

    private string Name {
      get { return base.Component.Site.Name; }
      set { base.Component.Site.Name = value; }
    }

    private ContextMenu ContextMenu {
      get { return (ContextMenu) base.ShadowProperties["ContextMenu"]; }
      set { base.ShadowProperties["ContextMenu"] = value; }
    }

    private Point Location {
      get { return this.Control.Location; }
      set { this.Control.Location = value; }
    }
#endregion


#region Utility methods
    internal object GetValue (object component, string propertyName)
    {
       return this.GetValue (component, propertyName, null);
    }
    
    internal object GetValue (object component, string propertyName, Type propertyType)
    {
      PropertyDescriptor prop = TypeDescriptor.GetProperties (component)[propertyName] as PropertyDescriptor;
      if (prop == null)
        throw new InvalidOperationException ("Property \"" + propertyName + "\" is missing on " + 
                           component.GetType().AssemblyQualifiedName);
      if (propertyType != null && !propertyType.IsAssignableFrom (prop.PropertyType))
          throw new InvalidOperationException ("Types do not match: " + prop.PropertyType.AssemblyQualifiedName +
                             " : " + propertyType.AssemblyQualifiedName);
      return prop.GetValue (component);
    }

    internal void SetValue (object component, string propertyName, object value)
    {
      PropertyDescriptor prop = TypeDescriptor.GetProperties (component)[propertyName] as PropertyDescriptor;

      if (prop == null)
          throw new InvalidOperationException ("Property \"" + propertyName + "\" is missing on " + 
                             component.GetType().AssemblyQualifiedName);
      if (!prop.PropertyType.IsAssignableFrom (value.GetType ()))
          throw new InvalidOperationException ("Types do not match: " + value.GetType ().AssemblyQualifiedName +
                             " : " + prop.PropertyType.AssemblyQualifiedName);
      if (!prop.IsReadOnly)
        prop.SetValue (component, value);
    }
#endregion

    protected override void Dispose (bool disposing)
    {
      if (disposing) {
        if (this.Control != null) {
          UnhookChildControls (Control);
          OnMouseDragEnd (true);
          _messageRouter.Dispose ();
          this.Control.DragDrop -= new DragEventHandler (OnDragDrop);
          this.Control.DragEnter -= new DragEventHandler (OnDragEnter);
          this.Control.DragLeave -= new EventHandler (OnDragLeave);
          this.Control.DragOver -= new DragEventHandler (OnDragOver);
        }
      }
      base.Dispose (true);
    }



#if NET_2_0
    public virtual ControlDesigner InternalControlDesigner (int internalControlIndex)
    {
      return null;
    }

    public virtual int NumberOfInternalControlDesigners ()
    {
      return 0;
    }

    protected bool EnableDesignMode (Control child, string name)
    {
      if (name == null)
        throw new ArgumentNullException ("name");
      if (child == null)
        throw new ArgumentNullException ("child");

      bool success = false;
      INestedContainer nestedContainer = this.GetService (typeof (INestedContainer)) as INestedContainer;
      if (nestedContainer != null) {
        nestedContainer.Add (child, name);
        success = true;
      }
      return success;
    }

#region NET_2_0 Stubs

    [ComVisible (true)]
    public class ControlDesignerAccessibleObject : AccessibleObject
    {
      [MonoTODO]
      public ControlDesignerAccessibleObject (ControlDesigner designer, Control control)
      {
        throw new NotImplementedException ();
      }

      [MonoTODO]
      public override AccessibleObject GetChild (int index)
      {
        throw new NotImplementedException ();
      }

      [MonoTODO]
      public override int GetChildCount ()
      {
        throw new NotImplementedException ();
      }

      [MonoTODO]
      public override AccessibleObject GetFocused ()
      {
        throw new NotImplementedException ();
      }

      [MonoTODO]
      public override AccessibleObject GetSelected ()
      {
        throw new NotImplementedException ();
      }

      [MonoTODO]
      public override AccessibleObject HitTest (int x, int y)
      {
        throw new NotImplementedException ();
      }

      [MonoTODO]
      public override Rectangle Bounds {
        get { throw new NotImplementedException (); }
      }

      [MonoTODO]
      public override string DefaultAction {
        get { throw new NotImplementedException (); }
      }

      [MonoTODO]
      public override string Description {
        get { throw new NotImplementedException (); }
      }

      [MonoTODO]
      public override string Name {
        get { throw new NotImplementedException (); }
      }

      [MonoTODO]
      public override AccessibleObject Parent {
        get { throw new NotImplementedException (); }
      }

      [MonoTODO]
      public override AccessibleRole Role {
        get { throw new NotImplementedException (); }
      }

      [MonoTODO]
      public override AccessibleStates State {
        get { throw new NotImplementedException (); }
      }

      [MonoTODO]
      public override string Value {
        get { throw new NotImplementedException (); }
      }
    }

    [MonoTODO]
    protected virtual ControlBodyGlyph GetControlGlyph (GlyphSelectionType selectionType)
    {
      throw new NotImplementedException ();
    }

    [MonoTODO]
    public virtual GlyphCollection GetGlyphs (GlyphSelectionType selectionType)
    {
      throw new NotImplementedException ();
    }

    [MonoTODO]
    public override void InitializeExistingComponent (IDictionary defaultValues)
    {
      throw new NotImplementedException ();
    }

    [MonoTODO]
    public override void InitializeNewComponent (IDictionary defaultValues)
    {
      throw new NotImplementedException ();
    }

    [MonoTODO]
    protected virtual void OnDragComplete (DragEventArgs de)
    {
      throw new NotImplementedException ();
    }

    [MonoTODO]
    protected override InheritanceAttribute InheritanceAttribute {
      get { throw new NotImplementedException (); }
    }

    [MonoTODO]
    public virtual IList SnapLines {
      get { throw new NotImplementedException (); }
    }

    [MonoTODO]
    public virtual bool ParticipatesWithSnapLines {
      get { throw new NotImplementedException (); }
    }

    [MonoTODO]
    public bool AutoResizeHandles {
      get { throw new NotImplementedException (); }
      set { throw new NotImplementedException (); }
    }
#endregion
#endif


  }
}
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