以前发表过《通过监听Windows消息对复合控件进行整体控制(C#)一 》两篇，讲述了通过FrameWork框架提供的技术监听Windows消息来实现事件的路由，但部分实现并不是很好，而且有部分功能并不能很好解决控件的事件，此篇通过对原方法进行改写，有些实现通过调用Windows API辅助解决，基本上解决了控件的键盘和鼠标事件的路由。（JS和WPF有事件路由的功能）
实现 IMessageFilter 接口 和 注册控件的鼠标和键盘事件等对外接口请参考《通过监听Windows消息对复合控件进行整体控制(C#)一 》，内部的实现通过使用Windows API 使代码更严谨和清晰。
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 常量及开源
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;
//----------开源代码----------------------
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
//取出客户端的矩形，相对于控件自身。
[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);
//获取窗口标题
[DllImport("user32", SetLastError = true)]
public static extern int GetWindowText(
int hWnd, //窗口句柄
StringBuilder lpString, //标题
int nMaxCount //最大值
);
//获取类的名字
[DllImport("user32.dll")]
private static extern int GetClassName(
int hWnd, //句柄
StringBuilder lpString, //类名
int nMaxCount //最大值
);
////根据坐标获取窗口句柄
//[DllImport("user32")]
//private static extern IntPtr WindowFromPoint(
//POINT Point //坐标
//);
#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;
}
}
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 常量及开源
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;
//----------开源代码----------------------
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
//取出客户端的矩形，相对于控件自身。
[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);
//获取窗口标题
[DllImport("user32", SetLastError = true)]
public static extern int GetWindowText(
int hWnd, //窗口句柄
StringBuilder lpString, //标题
int nMaxCount //最大值
);
//获取类的名字
[DllImport("user32.dll")]
private static extern int GetClassName(
int hWnd, //句柄
StringBuilder lpString, //类名
int nMaxCount //最大值
);
////根据坐标获取窗口句柄
//[DllImport("user32")]
//private static extern IntPtr WindowFromPoint(
//POINT Point //坐标
//);
#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;
}
}
注册需要监听的控件的事件，并对控件集合进行排序，根据包含关系由子到父进行排序
View Code
/// <summary>
/// 注册一个监听的控件。
/// </summary>
/// <param name="wrapper"></param>
public void Regist(RegistControlWrapper wrapper)
{
lock (m_lckObj)
{
m_RegistControls[wrapper.Handle] = wrapper;
//对集合进行包含性排序，即把子的排在前面
//对集合进行包含性排序，即把子的排在前面
m_KeyValuePairControls.Clear();
if (m_RegistControls.Count >= 2) //大于2就进行排序。
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);
}
}
}
/// 注册一个监听的控件。
/// </summary>
/// <param name="wrapper"></param>
public void Regist(RegistControlWrapper wrapper)
{
lock (m_lckObj)
{
m_RegistControls[wrapper.Handle] = wrapper;
//对集合进行包含性排序，即把子的排在前面
//对集合进行包含性排序，即把子的排在前面
m_KeyValuePairControls.Clear();
if (m_RegistControls.Count >= 2) //大于2就进行排序。
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);
}
}
}
在处理鼠标事件中，最麻烦的是鼠标进入事件和离开事件，由于IMessageFilter对进程外的其他进程的消息是监听不了的，而鼠标离开事件并不能根据WM_MOUSELEAVE 消息进行即时的处理，因此，必需更好的使用API才能实现。
使用GetCursorPos获取当前光标的位置，然后通过WindowFromPoint获取光标对应的控件的句柄，再由IsChild判断句柄是否在订阅的控件里来决定鼠标是否完全离开该控件，对于由于进入子控件而产生的WM_MOUSELEAVE 消息，还得在合适的时机调用TrackMouseEvent，以使该控件下次能再次发出WM_MOUSELEAVE 消息。
鼠标离开的消息处理方法
/// <summary>
/// 处理鼠标离开事件。
/// </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导致顶层控件产生MouseLeave事件的，将屏闭该消息。
int handle = m.HWnd.ToInt32();
if (GetTopParenRegistControl(handle) > 0)
{
//获取当前光标的位置下的控件是否为该控件的子
POINT pt = new POINT();
Win32API.GetCursorPos(ref pt); //屏幕
//获取当前屏幕点下的控件
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; //不做离开事件。如要下次再发出WM_MOUSELEAVE消息，得执行TrackMouseEvent方法（每调用些方法一次，才发出一次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，觉得没有意义
//SetLeaveFlags(ref cancel);
//RaiseAllMouseLeaveEvent(m_CacheEntry.CurrentHandle);
if (m_CacheEntry.CurrentHandle == m_CacheEntry.ParentHandle)
{
m_CacheEntry.ControlWrapper.IsTrackLeave = false;
}
else
RaiseMouseLeaveEvent(m_CacheEntry.ParentHandle); //做多处离去事件，由里往外， 不知进入的是否要多处的需求（由外往里）？
m_CacheEntry.CurrentHandle = 0;
m_CacheEntry.ParentHandle = 0;
}
}
}
/// 处理鼠标离开事件。
/// </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导致顶层控件产生MouseLeave事件的，将屏闭该消息。
int handle = m.HWnd.ToInt32();
if (GetTopParenRegistControl(handle) > 0)
{
//获取当前光标的位置下的控件是否为该控件的子
POINT pt = new POINT();
Win32API.GetCursorPos(ref pt); //屏幕
//获取当前屏幕点下的控件
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; //不做离开事件。如要下次再发出WM_MOUSELEAVE消息，得执行TrackMouseEvent方法（每调用些方法一次，才发出一次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，觉得没有意义
//SetLeaveFlags(ref cancel);
//RaiseAllMouseLeaveEvent(m_CacheEntry.CurrentHandle);
if (m_CacheEntry.CurrentHandle == m_CacheEntry.ParentHandle)
{
m_CacheEntry.ControlWrapper.IsTrackLeave = false;
}
else
RaiseMouseLeaveEvent(m_CacheEntry.ParentHandle); //做多处离去事件，由里往外， 不知进入的是否要多处的需求（由外往里）？
m_CacheEntry.CurrentHandle = 0;
m_CacheEntry.ParentHandle = 0;
}
}
}
在这个版本中，严谨度和清晰度大大提高，完全解决鼠标离开的消息，但调试中发现鼠标进入事件有时多执行一次，考虑到实现开发中多执行一次进入事件，影响不大，这个小Bug留真正有需要解决的读者去完成，下面的完整的代码，仅供学习。