通過監聽Windows消息實現控件的鍵盤和鼠標事件路由

本文轉載自查看原文 2012-01-29 13:19 2615

以前發表過《通過監聽Windows消息對復合控件進行整體控制(C#)一》兩篇，講述了通過FrameWork框架提供的技術監聽Windows消息來實現事件的路由，但部分實現並不是很好，而且有部分功能並不能很好解決控件的事件，此篇通過對原方法進行改寫，有些實現通過調用Windows API輔助解決，基本上解決了控件的鍵盤和鼠標事件的路由。（JS和WPF有事件路由的功能）

實現 IMessageFilter 接口和注冊控件的鼠標和鍵盤事件等對外接口請參考《通過監聽Windows消息對復合控件進行整體控制(C#)一》，內部的實現通過使用Windows API 使代碼更嚴謹和清晰。

使用到的部分API方法

View Code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace LC.Windows.MessageListen
{
     class Win32API
    {
         // static public long Count;
         #region  常量及開源

         public const int WM_KEYDOWN = 0x100;
         public const int WM_SYSKEYDOWN = 0x104;
         public const int WM_KEYUP = 0x101;
         public const int WM_SYSKEYUP = 0x105;
         public const int WM_MOUSEMOVE = 0x200;
         public const int WM_MOUSEHOVER = 0x2a1;
         public const int WM_MOUSELEAVE = 0x2a3;
         public const int WM_LBUTTONDOWN = 0x201;
         public const int WM_LBUTTONUP = 0x202;
         public const int WM_LBUTTONDBLCLK = 0x203;
         public const int WM_RBUTTONDOWN = 0x204;
         public const int WM_RBUTTONUP = 0x205;
         public const int WM_RBUTTONDBLCLK = 0x206;
         public const int WM_NCMOUSEMOVE = 0xa0;
         public const int WM_NCLBUTTONDOWN = 0xa1;
         public const int WM_NCLBUTTONUP = 0xa2;
         public const int WM_MOUSEWHEEL = 0x20a;
         public const int WM_PAINT = 0xf;
         public const int WM_TIMER = 0x113;

         // ----------開源代碼----------------------
         int zDelta;

         public const int MK_LBUTTON = 0x0001;
         public const int MK_RBUTTON = 0x0002;
         public const int MK_SHIFT = 0x0004;
         public const int MK_CONTROL = 0x0008;
         public const int MK_MBUTTON = 0x0010;
         public const int MK_XBUTTON1 = 0x0020;
         public const int MK_XBUTTON2 = 0x0040;
         public static int GetXLParam( int lparam) { return LowWord(lparam); }
         public static int GetYLParam( int lparam) { return HighWord(lparam); }
         public static int LowWord( int word) { return word & 0xFFFF; }
         public static int HighWord( int word) { return word >> 16; }
         public static int GetWheelDeltaWParam( int wparam) { return HighWord(wparam); }
         public static MouseButtons GetMouseButtonWParam( int wparam)
        {
             int mask = LowWord(wparam);

             if ((mask & MK_LBUTTON) == MK_LBUTTON) return MouseButtons.Left;
             if ((mask & MK_RBUTTON) == MK_RBUTTON) return MouseButtons.Right;
             if ((mask & MK_MBUTTON) == MK_MBUTTON) return MouseButtons.Middle;
             if ((mask & MK_XBUTTON1) == MK_XBUTTON1) return MouseButtons.XButton1;
             if ((mask & MK_XBUTTON2) == MK_XBUTTON2) return MouseButtons.XButton2;

             return MouseButtons.None;
        }

         public MouseButtons GetMouseUpMouseButtons( int msg)
        {
             if (msg == WM_LBUTTONUP)
                 return MouseButtons.Left;
             else if (msg == WM_RBUTTONUP)
                 return MouseButtons.Right;
             else
                 return MouseButtons.None;
        }

         public const int CWP_ALL = 0x0000;
         public const int CWP_SKIPINVISIBLE = 0x0001;
         public const int CWP_SKIPDISABLED = 0x0002;
         public const int CWP_SKIPTRANSPARENT = 0x0004;

         public const uint TME_HOVER = 0x00000001;
         public const uint TME_LEAVE = 0x00000002;
         public const uint TME_QUERY = 0x40000000;
         public const uint TME_CANCEL = 0x80000000;

        [System.Runtime.InteropServices.DllImport( " user32.dll ")]
         public static extern int ShowCursor( bool isShow);

        [System.Runtime.InteropServices.DllImport( " user32.dll ")]
         public static extern int GetCapture();

        [System.Runtime.InteropServices.DllImport( " user32.dll ")]
         public static extern int SetCapture(IntPtr hWnd);

        [System.Runtime.InteropServices.DllImport( " user32.dll ")]
         public static extern bool ReleaseCapture();

        [System.Runtime.InteropServices.DllImport( " user32.dll ")]
         public static extern bool GetCursorPos( ref POINT pos);     // 如果POINT是class 就不能加ref

         // 取出客戶端的矩形，相對於控件自身。
        [System.Runtime.InteropServices.DllImport( " user32.dll ")]
         private static extern bool GetClientRect( int hwnd, [In, Out] ref RECT rect);

        [System.Runtime.InteropServices.DllImport( " user32.dll ")]
         public static extern bool PtInRect( ref RECT rect, POINT pos);

        [System.Runtime.InteropServices.DllImport( " user32.dll ")]
         public static extern int ChildWindowFromPointEx( int hwnd, POINT pos, uint un);

        [System.Runtime.InteropServices.DllImport( " user32.dll ")]
         public static extern bool ClientToScreen( int hwnd, ref POINT pos);

        [System.Runtime.InteropServices.DllImport( " user32.dll ")]
         public static extern bool ScreenToClient( int hwnd, ref POINT pos);

        [System.Runtime.InteropServices.DllImport( " user32.dll ")]
         public static extern bool IsChild( int hWndParent, int hWnd);

        [System.Runtime.InteropServices.DllImport( " user32.dll ")]
         public static extern int MapWindowPoints( int hWndFrom, int hWndTo, ref POINT point, int count);

        [System.Runtime.InteropServices.DllImport( " user32.dll ")]
         public static extern int WindowFromPoint(POINT point);

        [System.Runtime.InteropServices.DllImport( " user32.dll ")]
         public static extern int TrackMouseEvent( ref MouseTrackEvent trackEvent);

         // 獲取窗口標題
        [DllImport( " user32 ", SetLastError = true)]
         public static extern int GetWindowText(
         int hWnd, // 窗口句柄
        StringBuilder lpString, // 標題
         int nMaxCount // 最大值
        );

         // 獲取類的名字
        [DllImport( " user32.dll ")]
         private static extern int GetClassName(
         int hWnd, // 句柄
        StringBuilder lpString, // 類名
         int nMaxCount // 最大值
        );

         /// /根據坐標獲取窗口句柄
         // [DllImport("user32")]
         // private static extern IntPtr WindowFromPoint(
         // POINT Point // 坐標
         // );

         #endregion

    }

    [StructLayout(LayoutKind.Sequential)]
     public struct POINT
    {
         public int X;
         public int Y;
         public POINT( int x, int y)
        {
             this.X = x;
             this.Y = y;
        }
    }

    [StructLayout(LayoutKind.Sequential)]
     public struct RECT
    {
         public int left;
         public int top;
         public int right;
         public int bottom;
    }

    [StructLayout(LayoutKind.Sequential)]
     public struct MouseTrackEvent
    {
         public uint cbSize;
         public uint dwFlags;
         public int hwndTrack;
         public uint dwHoverTime;
    }

}

注冊需要監聽的控件的事件，並對控件集合進行排序，根據包含關系由子到父進行排序

View Code

/// <summary>
         /// 注冊一個監聽的控件。
         /// </summary>
         /// <param name="wrapper"></param>
         public void Regist(RegistControlWrapper wrapper)
        {
             lock (m_lckObj)
            {
                m_RegistControls[wrapper.Handle] = wrapper;
                 // 對集合進行包含性排序，即把子的排在前面
                 // 對集合進行包含性排序，即把子的排在前面
                m_KeyValuePairControls.Clear();
                 if (m_RegistControls.Count >= 2)     // 大於2就進行排序。
                    m_KeyValuePairControls = m_RegistControls.OrderBy(p => p, new ContainSubCtrlComparer<KeyValuePair< int, RegistControlWrapper>>()).ToList();
                 else if (m_RegistControls.Count == 1)
                    m_KeyValuePairControls = new List<KeyValuePair< int, RegistControlWrapper>>(m_RegistControls);

                 if (m_RegistControls.Count == 1)
                {
                    Application.AddMessageFilter( this);
                }
            }
        }

在處理鼠標事件中，最麻煩的是鼠標進入事件和離開事件，由於IMessageFilter對進程外的其他進程的消息是監聽不了的，而鼠標離開事件並不能根據WM_MOUSELEAVE 消息進行即時的處理，因此，必需更好的使用API才能實現。

使用GetCursorPos獲取當前光標的位置，然后通過WindowFromPoint獲取光標對應的控件的句柄，再由IsChild判斷句柄是否在訂閱的控件里來決定鼠標是否完全離開該控件，對於由於進入子控件而產生的WM_MOUSELEAVE 消息，還得在合適的時機調用TrackMouseEvent，以使該控件下次能再次發出WM_MOUSELEAVE 消息。

鼠標離開的消息處理方法

   /// <summary>
         /// 處理鼠標離開事件。
         /// </summary>
         /// <param name="m"></param>
         /// <param name="isCancel"></param>
         private void ProcessMouseLeave( ref Message m, ref bool cancel)
        {
             /// /如果是本集成的子控件導致頂層控件產生MouseLeave事件的，將屏閉該消息。

             int handle = m.HWnd.ToInt32();
             if (GetTopParenRegistControl(handle) > 0)
            {
                 // 獲取當前光標的位置下的控件是否為該控件的子
                POINT pt = new POINT();
                Win32API.GetCursorPos( ref pt);        // 屏幕

                 // 獲取當前屏幕點下的控件
                 int newHandle = Win32API.WindowFromPoint(pt);

                 if (newHandle == m_CacheEntry.ParentHandle || Win32API.IsChild(m_CacheEntry.ParentHandle, newHandle))
                {
                     if (m_CacheEntry.CurrentHandle == m_CacheEntry.ParentHandle)
                    {
                        cancel = true;       // 不做離開事件。如要下次再發出WM_MOUSELEAVE消息，得執行TrackMouseEvent方法（每調用些方法一次，才發出一次WM_MOUSELEAVE消息。）
                        m_CacheEntry.ControlWrapper.IsTrackLeave = false;
                    }
                }
                 else
                {
                     // 真正的退出

                     // 不做嵌套的控件的退出，覺得沒有意義
                     // SetLeaveFlags(ref cancel);
                     // RaiseAllMouseLeaveEvent(m_CacheEntry.CurrentHandle);

                     if (m_CacheEntry.CurrentHandle == m_CacheEntry.ParentHandle)
                    {
                        m_CacheEntry.ControlWrapper.IsTrackLeave = false;
                    }
                     else
                        RaiseMouseLeaveEvent(m_CacheEntry.ParentHandle);          // 做多處離去事件，由里往外，不知進入的是否要多處的需求（由外往里）？

                    m_CacheEntry.CurrentHandle = 0;
                    m_CacheEntry.ParentHandle = 0;
                }

             }

        }

在這個版本中，嚴謹度和清晰度大大提高，完全解決鼠標離開的消息，但調試中發現鼠標進入事件有時多執行一次，考慮到實現開發中多執行一次進入事件，影響不大，這個小Bug留真正有需要解決的讀者去完成，下面的完整的代碼，僅供學習。

/Files/Yjianyong/MessageListener.rar

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