vb.net - 填充/大小/边距，当使用 ToolstripControlHost 作为弹出控件时

Question

我正在使用 VB2008 Express。我一直在研究一个“弹出窗口”来选择一个日期范围。 DateTimePicker 并不理想，因为其目的是选择一个日期范围，该范围始终是从周日到周六的整整一周。控件工作正常，我为此感到非常自豪。我的问题与为此使用 ToolstripControlHost 时添加的边框有关。我附上了屏幕截图和我的代码。

在下面的代码中，假设存在一个名为“btnTimePeriod”的按钮，我希望在其下方显示一个面板，其中包含一些自定义项，面板的名称为“pnlDateRangePicker”。

它可以工作...但它看起来不正确。面板本身是 147 x 326 像素，但请注意所附图形中它在面板周围添加了我不想要的边框。上、下、左各有一个边框……不知为什么，右边的边框特别大。尽管我的代码没有明确设置它，但 AutoSize = true 所以我预计它会在面板周围缩小。

根据需要，我的代码已经将 ShowCheckMargin 和 ShowImageMargin 设置为 false。我没有包含 DrawDateCalander Sub 的代码，因为它不相关。我相信即使是空白面板也会产生相同的结果。我不知道这个 margin 是从哪里来的。有什么指导吗？

Private Sub btnTimePeriod_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnTimePeriod.Click
    Call DrawDateCalendar(DatePart(DateInterval.Month, FirstDisplayedSunday), DatePart(DateInterval.Year, FirstDisplayedSunday))
    Call ShowControlBelow(btnTimePeriod, pnlDateRangePicker)
End Sub

Sub ShowControlBelow(ByVal Showbutton As Control, ByVal ShownControl As Control)

    Dim PopupContainer As New ToolStripControlHost(ShownControl)
    PopupContainer.Margin = New Padding(0)
    Dim mnuDropDown As New ContextMenuStrip
    mnuDropDown.Padding = New Padding(0)
    mnuDropDown.ShowCheckMargin = False
    mnuDropDown.ShowImageMargin = False
    mnuDropDown.Items.Add(PopupContainer)
    ShowMenuBelow(Showbutton, mnuDropDown)

End Sub

Sub ShowMenuBelow(ByVal Showbutton As Control, ByVal WhichMenu As ContextMenuStrip, Optional ByVal AlignRight As Boolean = False)
    Dim x As Integer = 0
    Dim y As Integer = 0
    Dim itscontainer As Control = Showbutton.Parent
    x = Showbutton.Location.X
    y = Showbutton.Location.Y
    If Not itscontainer Is Nothing Then
        Do Until TypeOf itscontainer Is Form
            x = x + itscontainer.Location.X
            y = y + itscontainer.Location.Y
            itscontainer = itscontainer.Parent
            If itscontainer Is Nothing Then Exit Do
        Loop
    End If
    y = y + Showbutton.Height
    If AlignRight = True Then
        x = x - WhichMenu.Width + Showbutton.Width
    End If
    Dim xy As New Point(x, y)
    WhichMenu.Show(Showbutton.FindForm, xy)


End Sub

Answer 1

我从来没有为此使用过 ContextMenuStrip，也许这就是问题所在。

您可以尝试使用 ToolStripDropDown 代替:

Private Sub ShowControl(ByVal fromControl As Control, ByVal whichControl As Control)
  '\\ whichControl needs MinimumSize set:
  whichControl.MinimumSize = whichControl.Size

  Dim toolDrop As New ToolStripDropDown()
  Dim toolHost As New ToolStripControlHost(whichControl)
  toolHost.Margin = New Padding(0)
  toolDrop.Padding = New Padding(0)
  toolDrop.Items.Add(toolHost)
  toolDrop.Show(Me, New Point(fromControl.Left, fromControl.Bottom))
End Sub

Private Sub btnTimePeriod_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnTimePeriod.Click
  Call DrawDateCalendar(DatePart(DateInterval.Month, FirstDisplayedSunday), DatePart(DateInterval.Year, FirstDisplayedSunday))
  '\\Call ShowControlBelow(btnTimePeriod, pnlDateRangePicker)
  Call ShowControl(btnTimePeriod, pnlDateRangePicker)
End Sub