Question

我想在我的主窗体中捕获鼠标移动事件。虽然我能够为主窗体连接MouseEventHandler，但当光标位于UserControl或任何其他控件上时，事件不再触发。如何确保始终保持鼠标位置。

Answer 1

您可以使用低级鼠标钩。请参阅this示例并检查HookCallback中的WM_MOUSEMOVE消息。

您还可以使用IMessageFilter类捕获鼠标事件并触发事件以获取位置（注意：这只会获取窗口上方的位置，而不是在窗口之外）：

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

这是解决方案。虽然我可以用类似的方法看到另一个答案。但是自从我写这篇文章以来，我想发布它。这里MouseMessageFilter有一个静态事件调用MouseMove，你可以从应用程序的任何地方订阅。

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

我尝试了@ SwDevMan81提供的上述解决方案。虽然它工作得很好，但我也有问题@Randy Gamage提到“即使鼠标没有移动也会连续调用MouseMoved函数。当鼠标不在应用程序上时它会停止触发”。无论如何，这就是我提出的：

在表单构造函数中：

GlobalMouseHandler.MouseMovedEvent += GlobalMouseHandler_MouseMovedEvent;
Application.AddMessageFilter(new GlobalMouseHandler());

InitializeComponent();

事件处理程序：

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

我稍微改变了GlobalMouseHandler类：

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。

Answer 5

这是WPF的解决方案，在整个应用程序中都具有全局鼠标处理程序。由于WPF中的其他鼠标问题，我也使用了此功能。

使用System.Windows.Interop;

private const int WM_MOUSEMOVE = 0x0200;
public delegate void Del_MouseMovedEvent(Point mousePosition);

// Relative to this control, the mouse position will calculated
public IInputElement Elmt_MouseMovedRelativeElement = null;

// !! This is static; needs special treatment in a multithreaded application !!
public static event Del_MouseMovedEvent Evt_TheMouseMoved = null;

// your main function call
public MyMainWindows()
{
    // install the windows message filter first
    ComponentDispatcher.ThreadFilterMessage += ComponentDispatcher_ThreadFilterMessage;

    InitializeComponent();

    ...
}   

// filtering the windows messages
private void ComponentDispatcher_ThreadFilterMessage(ref MSG msg, ref bool handled)
{
    if(msg.message == WM_MOUSEMOVE)
    {
        this.Evt_TheMouseMoved?.Invoke(Mouse.GetPosition(this.Elmt_MouseMovedRelativeElement));
    }
}

// individual event for mouse movement
private void MyMouseMove(Point mousePoint)
{
    // called on every mouse move when event is assigned
    Console.WriteLine(mousePoint.X + " " + mousePoint.Y);
}

private void AnyFunctionDeeperInTheCode()
{
    // assign the handler to the static var of the main window
    MyMainWindows.Evt_TheMouseMoved += MyMouseMove;

    // set the element / control to which the mouse position should be calculated; 
    MyMainWindows.Elmt_MouseMovedRelativeElement = this;

    ...

    // undassign the handler from the static var of the main window
    MyMainWindows.Evt_TheMouseMoved -= MyMouseMove;
}

如何捕获鼠标移动事件

5 个答案: