WindowsGrip.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / AccessibleTech / longhorn / Automation / Win32Providers / MS / Internal / AutomationProxies / WindowsGrip.cs / 1 / WindowsGrip.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// 
// Description: Windows Button Proxy 
//
// History: 
//  07/01/2003 : [....]         Created
//---------------------------------------------------------------------------

using System; 
using System.Collections;
using System.Text; 
using System.Runtime.InteropServices; 
using System.Windows;
using System.Windows.Automation; 
using System.Windows.Automation.Provider;
using System.ComponentModel;
using MS.Win32;
 

namespace MS.Internal.AutomationProxies 
{ 

    class WindowsGrip: ProxyFragment 
    {
        // -----------------------------------------------------
        //
        //  Constructors 
        //
        //----------------------------------------------------- 
 
        #region Constructors
 
        public WindowsGrip (IntPtr hwnd, ProxyHwnd parent, int item)
            : base( hwnd, parent, item)
        {
            _sType = ST.Get(STID.LocalizedControlTypeGrip); 
            _sAutomationId = "Window.Grip"; // This string is a non-localizable string
        } 
 
        #endregion
 
        //------------------------------------------------------
        //
        //  Patterns Implementation
        // 
        //-----------------------------------------------------
 
        #region ProxySimple Interface 

        ///  
        /// Gets the bounding rectangle for this element
        /// 
        internal override Rect BoundingRectangle
        { 
            get
            { 
                if (IsGripPresent(_hwnd, false)) 
                {
                    NativeMethods.Win32Rect client = new NativeMethods.Win32Rect(); 
                    if (Misc.GetClientRectInScreenCoordinates(_hwnd, ref client))
                    {
                        NativeMethods.SIZE sizeGrip = GetGripSize(_hwnd, false);
 
                        if (Misc.IsLayoutRTL(_hwnd))
                        { 
                            return new Rect(client.left - sizeGrip.cx, client.bottom, sizeGrip.cx, sizeGrip.cy); 
                        }
                        else 
                        {
                            return new Rect(client.right, client.bottom, sizeGrip.cx, sizeGrip.cy);
                        }
                    } 
                }
 
                return Rect.Empty; 
            }
        } 

        #endregion

 
        //------------------------------------------------------
        // 
        //  Internal Methods 
        //
        //------------------------------------------------------ 

        #region Internal Methods

        static internal bool IsGripPresent(IntPtr hwnd, bool onStatusBar) 
        {
            NativeMethods.Win32Rect client = new NativeMethods.Win32Rect(); 
            if (!Misc.GetClientRectInScreenCoordinates(hwnd, ref client)) 
            {
                return false; 
            }

            // According to the documentation of GetClientRect, the left and top members are zero.  So if
            // they are negitive the control must be minimized, therefore the grip is not present. 
            if (client.left < 0 && client.top < 0 )
            { 
                return false; 
            }
 
            NativeMethods.SIZE sizeGrip = GetGripSize(hwnd, onStatusBar);
            if (!onStatusBar)
            {
                // When not on a status bar the grip should be out side of the client area. 
                sizeGrip.cx *= -1;
                sizeGrip.cy *= -1; 
            } 

            if (Misc.IsLayoutRTL(hwnd)) 
            {
                int x = client.left + (int)(sizeGrip.cx / 2);
                int y = client.bottom - (int)(sizeGrip.cy / 2);
                int hit = Misc.ProxySendMessageInt(hwnd, NativeMethods.WM_NCHITTEST, IntPtr.Zero, NativeMethods.Util.MAKELPARAM(x, y)); 

                return hit == NativeMethods.HTBOTTOMLEFT; 
            } 
            else
            { 
                int x = client.right - (int)(sizeGrip.cx / 2);
                int y = client.bottom - (int)(sizeGrip.cy / 2);
                int hit = Misc.ProxySendMessageInt(hwnd, NativeMethods.WM_NCHITTEST, IntPtr.Zero, NativeMethods.Util.MAKELPARAM(x, y));
 
                return hit == NativeMethods.HTBOTTOMRIGHT;
            } 
        } 

        internal static NativeMethods.SIZE GetGripSize(IntPtr hwnd, bool onStatusBar) 
        {
            using (ThemePart themePart = new ThemePart(hwnd, onStatusBar ? "STATUS" : "SCROLLBAR"))
            {
                return themePart.Size(onStatusBar ? (int)ThemePart.STATUSPARTS.SP_GRIPPER : (int)ThemePart.SCROLLBARPARTS.SBP_SIZEBOX, 0); 
            }
        } 
 
        #endregion
    } 
}

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