VB.net中面板上的按钮

Question

I have a panel that has 3 buttons adjacent to each other. Collectively, the buttons are the same size as the panel. How do I make the Panel1_MouseLeave event fire, since the buttons take up all of the panel?

Answer 1

When you hover over the buttons, the Panel1_MouseLeave will get fired. You could use a combination of button_MouseLeave and Panel1_MouseLeave to determine when the mouse has actually left the control.

Or as suggested above, make the buttons 1px smaller than the panel. When the MouseLeave() gets fired, check the mouse location. If it is in the bound of the panel, you have not left. If it is outside the bounds, then you have left.

Answer 2

Add a timer to your form and check the mouse position:

Private Sub Timer1_Tick(sender As Object, e As EventArgs) Handles Timer1.Tick
  If Panel1.ClientRectangle.Contains(Panel1.PointToClient(MousePosition)) Then
    If Not insidePanel Then
      insidePanel = True
      // do something...
    End If
  Else
    If insidePanel Then
      insidePanel = False
      // do something
    End If
  End If
End Sub