Question

我有一个表格，上面有很多控件。如何检测鼠标何时离开表格？我已尝试为每个控件和表单连接一个MouseLeave事件，但这不起作用，因为当鼠标经过控件时，这些事件会一直触发。有没有一种方法可以实际运作。？

Answer 1

你应该听：

MouseLeave表单所有控件的事件
表格

只需将侦听器链接到一个函数，该函数检查光标是否在表单客户端中。

试试这个：

    protected override void OnControlAdded(ControlEventArgs e)
    {
        SubscribeEvents(e.Control);
        base.OnControlAdded(e);
    }

    protected override void OnControlRemoved(ControlEventArgs e)
    {
        UnsubscribeEvents(e.Control);
        base.OnControlRemoved(e);
    }

    private void SubscribeEvents(Control control)
    {
        control.MouseLeave += new EventHandler(control_MouseLeave);
        control.ControlAdded += new ControlEventHandler(control_ControlAdded);
        control.ControlRemoved += new ControlEventHandler(control_ControlRemoved);

        foreach (Control innerControl in control.Controls)
        {
            SubscribeEvents(innerControl);
        }
    }

    private void UnsubscribeEvents(Control control)
    {
        control.MouseLeave -= new EventHandler(control_MouseLeave);
        control.ControlAdded -= new ControlEventHandler(control_ControlAdded);
        control.ControlRemoved -= new ControlEventHandler(control_ControlRemoved);

        foreach (Control innerControl in control.Controls)
        {
            UnsubscribeEvents(innerControl);
        }
    }

    private void control_ControlAdded(object sender, ControlEventArgs e)
    {
        SubscribeEvents(e.Control);
    }

    private void control_ControlRemoved(object sender, ControlEventArgs e)
    {
        UnsubscribeEvents(e.Control);
    }

    protected override void OnMouseLeave(EventArgs e)
    {
        CheckMouseLeave();
        base.OnMouseLeave(e);
    }

    private void control_MouseLeave(object sender, EventArgs e)
    {
        CheckMouseLeave();
    }

    private void CheckMouseLeave()
    {
        Point pt = PointToClient(Cursor.Position);

        if (ClientRectangle.Contains(pt) == false)
        {
            OnMouseLeftFrom();
        }
    }

    private void OnMouseLeftFrom()
    {
        Console.WriteLine("Mouse left the form");
    }

Answer 2

我所知道的唯一可靠的方法是计时器。这是调整翻转时不透明度的示例代码：

  public partial class Form1 : Form {
    Timer timer1 = new Timer();
    public Form1() {
      InitializeComponent();
      this.Opacity = 0.10;
      timer1.Tick += new EventHandler(timer1_Tick);
      timer1.Interval = 200;
      timer1.Enabled = true;
    }

    void timer1_Tick(object sender, EventArgs e) {
      Point pos = Control.MousePosition;
      bool inForm = pos.X >= Left && pos.Y >= Top && pos.X < Right && pos.Y < Bottom;
      this.Opacity = inForm ? 0.99 : 0.10;
    }
  }

Answer 3

从查看aygunes.myopenid.com的回答我在Vb.Net中创建了这个版本，它将MouseLeaveHandlers递归添加到窗体上的所有控件，然后使用漂亮的Clientrectangle.Contains（pt）来检查mousecursor是打开还是打开形成。像魅力一样工作。 Cred转到aygunes.myopenid.com。

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    AddMouseLeaveHandlers()
End Sub
Sub AddMouseLeaveHandlers()
    For Each c As Control In Me.Controls
        HookItUp(c)
    Next
    AddHandler Me.MouseLeave, AddressOf CheckMouseLeave
End Sub
Sub HookItUp(ByVal c As Control)        
    AddHandler c.MouseLeave, AddressOf CheckMouseLeave
    If c.HasChildren Then
        For Each f As Control In c.Controls
            HookItUp(f)
        Next
    End If
End Sub
Private Sub CheckMouseLeave(ByVal sender As Object, ByVal e As System.EventArgs)
    Dim pt As Point = PointToClient(Cursor.Position)
    If ClientRectangle.Contains(pt) = False Then
        MsgBox("Mouse left form")
    End If
End Sub

Answer 4

把它放在计时器中：

If PointToClient(MousePosition).X < Me.Size.Width AndAlso PointToClient(MousePosition).X > -1 AndAlso PointToClient(MousePosition).Y < Me.Size.Height AndAlso PointToClient(MousePosition).Y > -1 Then
    'Mouse is inside the form
Else
    'Mouse is outside of form
End If

如何检测鼠标何时离开表格？

4 个答案: