事件顺序上的不同面板的MouseEnter和MouseLeave冲突 [英] Different Panels' MouseEnter and MouseLeave conflict on Event Order

问题描述

在这里，我有两个并排面板的 first_pnl 和 second_pnl ，第二个面板不是默认显示。初始想法我需要的：

• 如果我的光标超过第一个（ MouseEnter
  
  
  
  • BackColor 将更改为Black
  
  
  • 第二个面板将可见
  
  


• 如果我的光标离开第一个（ MouseLeave ）
  
  
  
  
  • 这是 BackColor 将改回格雷
  
  
  • 第二个面板将不可见
  
  

简单如下：

  Private Sub PanelMouseEnter（sender As Object，e As EventArgs）_ 
处理first_pnl.MouseEnter 
 first_pnl.BackColor = Color.Black 
 second_pnl.Visible = True 
 End Sub 
 Private Sub PanelMouseLeave（sender As Object，e As EventArgs）_ 
处理first_pnl.MouseLeave 
 first_pnl.BackColor = Color.Gray 
 second_pnl.Visible = False 
 End Sub 
  

但是我想要发生的是：

• 当光标移动到第二个面板（现在是可见的）
  
  
  
  
  • second_pnl 将保持
  
  
  • 它维持 first_pnl 属性，就像在 MouseEnter 事件
  
  

这里的情况要清楚：

这是我的逻辑私人子PanelMouseEnter（发件人作为对象，e作为EventArgs）

  _ 
手柄first_pnl.MouseEnter，second_pnl.MouseEnter 
 first_pnl.BackColor = Color.Black 
 second_pnl.Visible = True 
 End Sub 
 Private Sub PanelMouseLeave（sender As Object ，e As EventArgs）_ 
处理first_pnl.MouseLeave ，second_pnl.MouseLeave 
 first_pnl.BackColor = Color.Gray 
 second_pnl.Visible = False 
 End Sub 
  

看起来很合理，但我认为系统首先考虑 firstPnl 之前的 MouseLeave 它甚至考虑 MouseEnter second_pnl 。
任何方式来做？

解决方案

jmcilhinney的评论很容易解决。

  Private Sub Form1_MouseEnter（ByVal sender As Object，ByVal e As System.EventArgs）处理Me.MouseEnter 
 first_pnl.BackColor = Color.Gray 
 second_pnl.Visible = False 
 End Sub 
 
 Private Sub first_pnl_MouseEnter（ByVal sender As Object，ByVal e As System.EventArgs）处理first_pnl.MouseEnter 
 first_pnl.BackColor = Color.Black 
 second_pnl.Visible = True 
 End Sub 
  

Here, I have two side-by-side panel the first_pnl and second_pnl, the second panel is not visible by default. Initial thoughts of what I need:

• If my cursor is over the the first one (MouseEnter)
  • It's BackColor would change to Black
  • Second panel would be visible
• If my cursor leaves first one (MouseLeave)
  • It's BackColor would change back to Gray
  • Second panel would not be visible

Which is simple as:

Private Sub PanelMouseEnter(sender As Object, e As EventArgs) _
        Handles first_pnl.MouseEnter
        first_pnl.BackColor = Color.Black
        second_pnl.Visible = True
    End Sub
    Private Sub PanelMouseLeave(sender As Object, e As EventArgs) _
        Handles first_pnl.MouseLeave
        first_pnl.BackColor = Color.Gray
        second_pnl.Visible = False
    End Sub

But what I want to happen is:

• When the cursor moves to the second panel (which by now is visible)
  • second_pnl would remain visible unless the cursor leave its area.
  • It sustains first_pnl property as if it where on a MouseEnter event

And here's the scenario to be clear:

And here's my logic of making that possible: (Giving their same events with same code)

Private Sub PanelMouseEnter(sender As Object, e As EventArgs) _
        Handles first_pnl.MouseEnter, second_pnl.MouseEnter
        first_pnl.BackColor = Color.Black
        second_pnl.Visible = True
    End Sub
    Private Sub PanelMouseLeave(sender As Object, e As EventArgs) _
        Handles first_pnl.MouseLeave, second_pnl.MouseLeave
        first_pnl.BackColor = Color.Gray
        second_pnl.Visible = False
    End Sub

Looks reasonable, but I think the system consider first the MouseLeave of first_pnl before it even consider the MouseEnter of second_pnl. Any way to do it?

解决方案

jmcilhinney's comment solves this easily.

Private Sub Form1_MouseEnter(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.MouseEnter
    first_pnl.BackColor = Color.Gray
    second_pnl.Visible = False
End Sub

Private Sub first_pnl_MouseEnter(ByVal sender As Object, ByVal e As System.EventArgs) Handles first_pnl.MouseEnter
    first_pnl.BackColor = Color.Black
    second_pnl.Visible = True
End Sub

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