如何捕獲鼠標移動事件

Question

我想捕獲我的主窗體中的鼠標移動事件。儘管我可以爲主窗體連接MouseEventHandler，但當光標位於UserControl或其他任何控件上時，事件不再觸發。我如何確保我始終擁有鼠標位置。

Answer 1

您可以使用低級別的鼠標鉤子。請參閱this示例，並檢查HookCallback中的WM_MOUSEMOVE消息。

您也可以使用IMessageFilter類抓老鼠事件和觸發事件，以獲得位置（注意：這隻會位置在窗口，它不是外面）：

using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Text; 
using System.Windows.Forms; 

namespace GlobalMouseEvents 
{ 
    public partial class Form1 : Form 
    { 
     public Form1() 
     { 
     GlobalMouseHandler gmh = new GlobalMouseHandler(); 
     gmh.TheMouseMoved += new MouseMovedEvent(gmh_TheMouseMoved); 
     Application.AddMessageFilter(gmh); 

     InitializeComponent(); 
     } 

     void gmh_TheMouseMoved() 
     { 
     Point cur_pos = System.Windows.Forms.Cursor.Position; 
     System.Console.WriteLine(cur_pos); 
     } 
    } 

    public delegate void MouseMovedEvent(); 

    public class GlobalMouseHandler : IMessageFilter 
    { 
     private const int WM_MOUSEMOVE = 0x0200; 

     public event MouseMovedEvent TheMouseMoved; 

     #region IMessageFilter Members 

     public bool PreFilterMessage(ref Message m) 
     { 
     if (m.Msg == WM_MOUSEMOVE) 
     { 
      if (TheMouseMoved != null) 
      { 
       TheMouseMoved(); 
      } 
     } 
     // Always allow message to continue to the next filter control 
     return false; 
     } 

     #endregion 
    } 
} 

Answer 2

這是解決方案。儘管我可以用類似的方法看到另一個答案。但是自從我寫了它以後，我想發佈它。這裏MouseMessageFilter有一個靜態事件調用MouseMove，你可以從應用程序中的任何地方訂閱。

static class Program 
{ 
    [STAThread] 
    static void Main() { 
     Application.EnableVisualStyles(); 
     Application.SetCompatibleTextRenderingDefault(false);    
     Application.AddMessageFilter(new MouseMessageFilter()); 
     MouseMessageFilter.MouseMove += new MouseEventHandler(OnGlobalMouseMove); 

     Application.Run(new MainForm()); 
    } 

    static void OnGlobalMouseMove(object sender, MouseEventArgs e) { 
     Console.WriteLine(e.Location.ToString()); 
    } 
} 

class MouseMessageFilter : IMessageFilter 
{ 
    public static event MouseEventHandler MouseMove = delegate { }; 
    const int WM_MOUSEMOVE = 0x0200; 

    public bool PreFilterMessage(ref Message m) { 

     if (m.Msg == WM_MOUSEMOVE) { 

      Point mousePosition = Control.MousePosition; 

      MouseMove(null, new MouseEventArgs(
       MouseButtons.None, 0, mousePosition.X, mousePosition.Y,0)); 
     }  
     return false; 
    } 
} 

Answer 3

public partial class frmCaptureMouse : Form 
{ 
    [DllImport("user32.dll")] 
    static extern IntPtr SetCapture(IntPtr hWnd); 

    public frmCaptureMouse() 
    { 
     InitializeComponent(); 
    } 

    private void frmCaptureMouse_MouseMove(object sender, MouseEventArgs e) 
    { 
     try 
     { 
      lblCoords.Text = e.Location.X.ToString() + ", " + e.Location.Y.ToString(); 
     } 
     catch (Exception ex) 
     { 
      MessageBox.Show(ex.Message); 
     } 
    } 

    private void btnCapture_Click(object sender, EventArgs e) 
    { 
     try 
     { 
      SetCapture(this.Handle); 
     } 
     catch (Exception ex) 
     { 
      MessageBox.Show(ex.Message); 
     } 
    } 
} 

Answer 4

我試圖通過@ SwDevMan81提供上述solutoution。雖然它的效果很好，但我也遇到了@Randy Gamage的問題，「即使鼠標沒有移動，MouseMoved函數也會被連續調用，當鼠標不在應用程序時它會停止觸發。 在這無論如何是我想出了：

在窗體的構造函數：

​​

的事件處理程序：

private void GlobalMouseHandler_MouseMovedEvent(object sender, MouseEventArgs e) 
{ 
    try 
    { 
     //Do whatever ... 
    } 
    catch { } 
} 

而且我稍微改變GlobalMouseHandler類：

public class GlobalMouseHandler : IMessageFilter 
{ 
    private const int WM_MOUSEMOVE = 0x0200; 
    private System.Drawing.Point previousMousePosition = new System.Drawing.Point(); 
    public static event EventHandler<MouseEventArgs> MouseMovedEvent = delegate { }; 

    #region IMessageFilter Members 

    public bool PreFilterMessage(ref System.Windows.Forms.Message m) 
    { 
     if (m.Msg == WM_MOUSEMOVE) 
     { 
      System.Drawing.Point currentMousePoint = Control.MousePosition; 
      if (previousMousePosition != currentMousePoint) 
      { 
       previousMousePosition = currentMousePoint; 
       MouseMovedEvent(this, new MouseEventArgs(MouseButtons.None, 0, currentMousePoint.X, currentMousePoint.Y, 0)); 
      } 
     } 
     // Always allow message to continue to the next filter control 
     return false; 
    } 

    #endregion 
} 

我希望有人可以使用它。