c# - Telerik，处理点击 RadDropDownButton 文本区域

Question

我有一个带有预定义文本和一个 RadMenuItem 的 RadDropDownButton:

我的意图是在单击文本区域(而不是箭头)时执行操作:

然后当我点击可选项目时执行其他操作:

处理 RadMenuItem.Click 已完成，没问题，但是 RadDropDownButton.Click 事件会在我点击控件的任何地方而不仅仅是在文本中时触发区域。

如何解决这个问题，让控件按我希望的方式工作？

Private sub MyRadDropDownButton_click() handles MyRadDropDownButton.click

    ' this instruction should be launched only when clicking on the "Analyze" word.
    ' this means everywhere on the control but not on the arrow.
    msgbox("you've clicked on the "Analyze" word")

end sub

Answer 1

他们的 SplitButton 有点脑残，IMO。大多数 SplitButton 将箭头区域视为虚拟按钮，并跳过发出 Button CLick 事件或显示关联的下拉菜单(或两者)。单击该区域时，大多数使用新的 SplitClicked 事件，因此您可以根据需要摆弄菜单:

Protected Overrides Sub OnMouseDown(ByVal mevent As MouseEventArgs)
    ...

    ' they clicked in the arrow.split rect
    If (SplitRect.Contains(mevent.Location)) Then

        ' notify them 
        RaiseEvent SplitClick(Me, New EventArgs)

        ' open the menu if there is one
        If ShowContextMenuStrip() = False Then
            skipNextClick = True       ' fixup for the menu
        End If         

    Else
        ' let the normal event get raised
        State = PushButtonState.Pressed
        MyBase.OnMouseDown(mevent)
    End If

End Sub 

它们没有类似的事件，但作为解决方法，您可以使用 DropDownOpening 事件来“取消”按钮单击事件，就像这样(这是有效的，因为 DropDownOpening 事件总是先触发):

' workaround flag
Private IgnoreClickBecauseMenuIsOpening As Boolean
Private Sub RadSplitButton1_DropDownOpening(sender As Object, 
          e As EventArgs) Handles RadSplitButton1.DropDownOpening

    IgnoreClickBecauseMenuIsOpening = True
    ' code to modify menu (or not)

End Sub

Private Sub RadSplitButton1_Click(sender As Object, 
        e As EventArgs) Handles RadSplitButton1.Click

    ' ignore click if menu is opening
    If IgnoreClickBecauseMenuIsOpening Then
        ' reset flag
        IgnoreClickBecauseMenuIsOpening = False
        Exit Sub                    ' all done here
    End If
    ' normal code to execute for a click
End Sub