如何捕获鼠标移动事件 [英] How do I capture the mouse move event

问题描述

我想在我的主窗体中捕获鼠标移动事件.尽管我能够为主窗体连接 MouseEventHandler，但是当光标位于 UserControl 或任何其他控件上时，该事件不再触发.如何确保我始终拥有鼠标位置.

I would like to capture the mouse move event in my main form. Although I am able to wire up the MouseEventHandler for the main form, the event no longer fires when the cursor is over a UserControl or any other control. How do I ensure that I always have the mouse position.

推荐答案

您可以使用低级鼠标挂钩.请参阅此示例并检查 HookCallback 中的 WM_MOUSEMOVE 消息.

You could use a low level mouse hook. See this example and check for the WM_MOUSEMOVE mesage in HookCallback.

您还可以使用 IMessageFilter 类来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，而不是窗口之外的位置):

You could also use the IMessageFilter class to catch the Mouse Events and trigger an event to get the position (note: this will only get the position over the window, not outside of it):

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
   }
}

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