的WinForms:检测时,指针进入/离开的形式或其控制 [英] WinForms: Detect when cursor enters/leaves the form or its controls
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问题描述
我需要的当光标进入或离开的形式检测的方式。当控件填写表格Form.MouseEnter /鼠标离开是不行的,所以我也必须订阅控制MouseEnter事件(如板的形式)。全球范围内跟踪表指针进入/退出的任何其他方式?
I need a way of detecting when the cursor enters or leaves the form. Form.MouseEnter/MouseLeave doesn't work when controls fill the form, so I will also have to subscribe to MouseEnter event of the controls (e.g. panels on the form). Any other way of tracking form cursor entry/exit globally?
推荐答案
您可以试试这个:
private void Form3_Load(object sender, EventArgs e)
{
MouseDetector m = new MouseDetector();
m.MouseMove += new MouseDetector.MouseMoveDLG(m_MouseMove);
}
void m_MouseMove(object sender, Point p)
{
Point pt = this.PointToClient(p);
this.Text = (this.ClientSize.Width >= pt.X &&
this.ClientSize.Height >= pt.Y &&
pt.X > 0 && pt.Y > 0)?"In":"Out";
}
在MouseDetector类:
The MouseDetector class :
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using System.Drawing;
class MouseDetector
{
#region APIs
[DllImport("gdi32")]
public static extern uint GetPixel(IntPtr hDC, int XPos, int YPos);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern bool GetCursorPos(out POINT pt);
[DllImport("User32.dll", CharSet = CharSet.Auto)]
public static extern IntPtr GetWindowDC(IntPtr hWnd);
#endregion
Timer tm = new Timer() {Interval = 10};
public delegate void MouseMoveDLG(object sender, Point p);
public event MouseMoveDLG MouseMove;
public MouseDetector()
{
tm.Tick += new EventHandler(tm_Tick); tm.Start();
}
void tm_Tick(object sender, EventArgs e)
{
POINT p;
GetCursorPos(out p);
if (MouseMove != null) MouseMove(this, new Point(p.X,p.Y));
}
[StructLayout(LayoutKind.Sequential)]
public struct POINT
{
public int X;
public int Y;
public POINT(int x, int y)
{
X = x;
Y = y;
}
}
}
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