ResizeGrip.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Controls / Primitives / ResizeGrip.cs / 1 / ResizeGrip.cs
                        

                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// Description: Implements the ResizeGrip control 
// 
// History
//  10/24/03    [....]      Created 
//
//---------------------------------------------------------------------------

 
using System;
using System.Diagnostics; 
 
using System.Windows;
using System.Windows.Threading; 
using System.Windows.Media;
using System.Windows.Shapes;
#if OLD_AUTOMATION
using System.Windows.Automation.Provider; 
#endif
 
namespace System.Windows.Controls.Primitives 
{
 
    /// 
    ///     The ResizeGrip control enables the Window object to have a resize grip.  This control should be
    ///     made part of the Window's style visual tree.
    ///  
    /// 
    /// 
    ///  
#if OLD_AUTOMATION
    [Automation(AccessibilityControlType = "Thumb")] 
#endif
    public class ResizeGrip : Control
    {
        //---------------------------------------------- 
        //
        // Constructors 
        // 
        //----------------------------------------------
        #region Constructors 
        static ResizeGrip()
        {
            DefaultStyleKeyProperty.OverrideMetadata(typeof(ResizeGrip), new FrameworkPropertyMetadata(typeof(ResizeGrip)));
            _dType = DependencyObjectType.FromSystemTypeInternal(typeof(ResizeGrip)); 

            Window.IWindowServiceProperty.OverrideMetadata( 
                    typeof(ResizeGrip), 
                    new FrameworkPropertyMetadata(new PropertyChangedCallback(_OnWindowServiceChanged)));
        } 
        /// 
        ///     Default ResizeGrip constructor
        /// 
        ///  
        ///     Automatic determination of current Dispatcher. Use alternative constructor
        ///     that accepts a Dispatcher for best performance. 
        ///  
        public ResizeGrip() : base()
        { 
        }

        #endregion Constructors
 
        //----------------------------------------------
        // 
        // Private Methods 
        //
        //---------------------------------------------- 
        #region Private Methods

        private static void _OnWindowServiceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        { 
            ResizeGrip rg = d as ResizeGrip;
            Debug.Assert(rg != null, "DependencyObject must be of type ResizeGrip."); 
 
            rg.OnWindowServiceChanged(e.OldValue as Window, e.NewValue as Window);
        } 

        /// 
        ///     When IWindowService is invalidated, it means that this control is either placed into
        ///     a window's visual tree or taken out.  If we are in a new Window's visual tree, we 
        ///     want to set the reference to this object inside the Window.  Window uses this
        ///     reference in its WM_NCHITTEST code 
        ///  
        private void OnWindowServiceChanged(Window oldWindow, Window newWindow)
        { 
            if ((oldWindow != null) && (oldWindow != newWindow))
            {
                oldWindow.ClearResizeGripControl(this);
            } 

            if (newWindow != null) 
            { 
                newWindow.SetResizeGripControl(this);
            } 
        }

        #region DTypeThemeStyleKey
 
        // Returns the DependencyObjectType for the registered ThemeStyleKey's default
        // value. Controls will override this method to return approriate types. 
        internal override DependencyObjectType DTypeThemeStyleKey 
        {
            get { return _dType; } 
        }

        private static DependencyObjectType _dType;
 
        #endregion DTypeThemeStyleKey
 
        // 
        //  This property
        //  1. Finds the correct initial size for the _effectiveValues store on the current DependencyObject 
        //  2. This is a performance optimization
        //
        internal override int EffectiveValuesInitialSize
        { 
            get { return 28; }
        } 
        #endregion Private Methods 
    }
} 


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

Link Menu

Network programming in C#, Network Programming in VB.NET, Network Programming in .NET
This book is available now!
Buy at Amazon US or
Buy at Amazon UK