最近在编写Max插件时，其主容器FlowLayoutPanel由于隐藏了滚动条，要实现按住鼠标中键上下拖动的功能，因此尝试了全局鼠标事件、以及鼠标勾子，可惜由于Max不争气？都未能实现，于是代码报废，故将其分享于此。
一、全局鼠标事件，首先构建鼠标事件处理器
public delegate void MouseMovedEvent(); public delegate void MouseMDownEvent(); public delegate void MouseMUpEvent(); public class GlobalMouseHandler : IMessageFilter { private const int WM_MOUSEMOVE = 0x0200; private const int WM_MBUTTONDOWN = 0x0207; private const int WM_MBUTTONUP = 0x0208; public event MouseMovedEvent TheMouseMoved; public event MouseMDownEvent TheMouseMDown; public event MouseMUpEvent TheMouseMUp; #region IMessageFilter Members public bool PreFilterMessage(ref Message m) { if (m.Msg == WM_MOUSEMOVE) if (TheMouseMoved != null) TheMouseMoved(); if (m.Msg == WM_MBUTTONDOWN) if (TheMouseMDown != null) TheMouseMDown(); if (m.Msg == WM_MBUTTONUP) if (TheMouseMUp != null) TheMouseMUp(); // Always allow message to continue to the next filter control return false; } #endregion }
然后在FlowLayoutPanel的构造函数中添加如下代码（其事件，我这里使用的Lambda表达式）
GlobalMouseHandler gmh = new GlobalMouseHandler(); bool mFlag = false; int scY = 0; int msY = 0; Cursor tempCur = null; gmh.TheMouseMDown += () => { mFlag = true; scY = VerticalScroll.Value; msY = Cursor.Position.Y; tempCur = Cursor; Cursor = RCurs.Pan; }; gmh.TheMouseMoved += () => { if (mFlag) { int val = scY + msY - Cursor.Position.Y; if (val < VerticalScroll.Minimum) val = VerticalScroll.Minimum; if (val > VerticalScroll.Maximum) val = VerticalScroll.Maximum; VerticalScroll.Value = val; } }; gmh.TheMouseMUp += () => { mFlag = false; Cursor = tempCur; }; Application.AddMessageFilter(gmh); //Application在Max中无效
二、鼠标勾子，此法亦在Max中行不通（后来是通过对FlowLayoutPanel中的各个控件实行事件穿透解决的）
public class MouseHook { private const int WM_MOUSEMOVE = 0x200; private const int WM_LBUTTONDOWN = 0x201; private const int WM_RBUTTONDOWN = 0x204; private const int WM_MBUTTONDOWN = 0x207; private const int WM_LBUTTONUP = 0x202; private const int WM_RBUTTONUP = 0x205; private const int WM_MBUTTONUP = 0x208; private const int WM_LBUTTONDBLCLK = 0x203; private const int WM_RBUTTONDBLCLK = 0x206; private const int WM_MBUTTONDBLCLK = 0x209; //全局的事件 public event MouseEventHandler OnMouseActivity; static int hMouseHook = 0; //鼠标钩子句柄 //鼠标常量 public const int WH_MOUSE_LL = 14; //mouse hook constant HookProc MouseHookProcedure; //声明鼠标钩子事件类型. //声明一个Point的封送类型 [StructLayout(LayoutKind.Sequential)] public class POINT { public int x; public int y; } //声明鼠标钩子的封送结构类型 [StructLayout(LayoutKind.Sequential)] public class MouseHookStruct { public POINT pt; public int hWnd; public int wHitTestCode; public int dwExtraInfo; } //装置钩子的函数 [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)] public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId); //卸下钩子的函数 [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)] public static extern bool UnhookWindowsHookEx(int idHook); //下一个钩挂的函数 [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)] public static extern int CallNextHookEx(int idHook, int nCode, Int32 wParam, IntPtr lParam); public delegate int HookProc(int nCode, Int32 wParam, IntPtr lParam); /// <summary> /// 墨认的构造函数构造当前类的实例. /// </summary> public MouseHook() { } //析构函数. ~MouseHook() { Stop(); } public void Start() { //安装鼠标钩子 if (hMouseHook == 0) { //生成一个HookProc的实例. MouseHookProcedure = new HookProc(MouseHookProc); hMouseHook = SetWindowsHookEx(WH_MOUSE_LL, MouseHookProcedure, Marshal.GetHINSTANCE(System.Reflection.Assembly.GetExecutingAssembly().GetModules()[0]), 0); //如果装置失败停止钩子 if (hMouseHook == 0) { Stop(); throw new Exception("SetWindowsHookEx failed."); //Max中会抛出异常 } } } public void Stop() { bool retMouse = true; if (hMouseHook != 0) { retMouse = UnhookWindowsHookEx(hMouseHook); hMouseHook = 0; } //如果卸下钩子失败 if (!(retMouse)) throw new Exception("UnhookWindowsHookEx failed."); } private int MouseHookProc(int nCode, Int32 wParam, IntPtr lParam) { //如果正常运行并且用户要监听鼠标的消息 if ((nCode >= 0) && (OnMouseActivity != null)) { MouseButtons button = MouseButtons.None; int clickCount = 0; switch (wParam) { case WM_MBUTTONDOWN: button = MouseButtons.Middle; clickCount = 1; break; case WM_MBUTTONUP: button = MouseButtons.Middle; clickCount = 0; break; } //从回调函数中得到鼠标的信息 MouseHookStruct MyMouseHookStruct = (MouseHookStruct)Marshal.PtrToStructure(lParam, typeof(MouseHookStruct)); MouseEventArgs e = new MouseEventArgs(button, clickCount, MyMouseHookStruct.pt.x, MyMouseHookStruct.pt.y, 0); //if(e.X>700)return 1;//如果想要限制鼠标在屏幕中的移动区域可以在此处设置 OnMouseActivity(this, e); } return CallNextHookEx(hMouseHook, nCode, wParam, lParam); } }
调用的方法为：
MouseHook mouse = new MouseHook(); mouse.OnMouseActivity += (s, e) => { string str = "X:" + e.X + " Y:" + e.Y + " " + e.Button + " " + e.Clicks; this.Text = str; }; mouse.Start();
三、鼠标事件模拟
//切换到窗口 [DllImport("user32.dll")] public static extern bool SwitchToThisWindow(IntPtr hWnd, bool fAltTab); //获取鼠标所在窗口名柄 [DllImport("user32.dll")] internal static extern IntPtr WindowFromPoint(Point Point); [DllImport("user32.dll")] internal static extern bool GetCursorPos(out Point lpPoint); public static IntPtr GetMouseWindow() { Point p; GetCursorPos(out p); return WindowFromPoint(p); } //获取前台窗口 [DllImport("user32.dll")] public static extern IntPtr GetForegroundWindow(); /// <summary> /// 模拟鼠标操作 /// </summary> [DllImport("user32")] private static extern int mouse_event(int dwFlags, int dx, int dy, int cButtons, int dwExtraInfo); //移动鼠标 const int MOUSEEVENTF_MOVE = 0x0001; //模拟鼠标左键按下 const int MOUSEEVENTF_LEFTDOWN = 0x0002; //模拟鼠标左键抬起 const int MOUSEEVENTF_LEFTUP = 0x0004; //模拟鼠标右键按下 const int MOUSEEVENTF_RIGHTDOWN = 0x0008; //模拟鼠标右键抬起 const int MOUSEEVENTF_RIGHTUP = 0x0010; //模拟鼠标中键按下 const int MOUSEEVENTF_MIDDLEDOWN = 0x0020; //模拟鼠标中键抬起 const int MOUSEEVENTF_MIDDLEUP = 0x0040; //标示是否采用绝对坐标 const int MOUSEEVENTF_ABSOLUTE = 0x8000; public static void MouseMove(int x, int y) { mouse_event(MOUSEEVENTF_MOVE, x, y, 0, 0); } public static void MouseClick() { mouse_event(MOUSEEVENTF_LEFTDOWN | MOUSEEVENTF_LEFTUP, 0, 0, 0, 0); //再复制一份则为双击 } public static void MouseDown() { mouse_event(MOUSEEVENTF_LEFTDOWN, 0, 0, 0, 0); } public static void MouseUp() { mouse_event(MOUSEEVENTF_LEFTUP, 0, 0, 0, 0); }