vb.net - 允许用户移动无边框窗口

Question

我有一个没有边框的表单，我希望用户能够移动它。我还没有找到任何可以让我这样做的东西。

是否可以移动边框设置为无的窗口？

Answer 1

引入一个布尔变量，如果表单当前被拖动，则该变量保存状态，以及保存拖动起点的变量。然后 OnMove 相应地移动表单。由于这已经在其他地方得到了回答，我只是复制并粘贴到这里。

Class Form1
    Private IsFormBeingDragged As Boolean = False
    Private MouseDownX As Integer
    Private MouseDownY As Integer

    Private Sub Form1_MouseDown(ByVal sender As Object, ByVal e As MouseEventArgs) Handles MyBase.MouseDown

        If e.Button = MouseButtons.Left Then
            IsFormBeingDragged = True
            MouseDownX = e.X
            MouseDownY = e.Y
        End If
    End Sub

    Private Sub Form1_MouseUp(ByVal sender As Object, ByVal e As MouseEventArgs) Handles MyBase.MouseUp

        If e.Button = MouseButtons.Left Then
            IsFormBeingDragged = False
        End If
    End Sub

    Private Sub Form1_MouseMove(ByVal sender As Object, ByVal e As MouseEventArgs) Handles MyBase.MouseMove

        If IsFormBeingDragged Then
            Dim temp As Point = New Point()

            temp.X = Me.Location.X + (e.X - MouseDownX)
            temp.Y = Me.Location.Y + (e.Y - MouseDownY)
            Me.Location = temp
            temp = Nothing
        End If
    End Sub
End Class

从http://www.dreamincode.net/forums/topic/59643-moving-form-with-formborderstyle-none/偷来的

Answer 2

所有“简单”的 VB 答案都让我的表单在多个屏幕上跳跃。所以我从 C# 中的相同答案中得出这个，它就像一个魅力：

Public Const WM_NCLBUTTONDOWN As Integer = 161
Public Const HT_CAPTION As Integer = 2

然后

 <DllImport("User32")> Private Shared Function SendMessage(hWnd As IntPtr, Msg As Integer, wParam As Integer, lParam As Integer) As Integer

End Function

<DllImport("User32")> Private Shared Function ReleaseCapture() As Boolean

End Function

最后

Private Sub Form1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseDown
    If (e.Button = MouseButtons.Left) Then
        ReleaseCapture()
        SendMessage(Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0)
    End If
End Sub

Answer 3

另一种方法是处理WM_NCHITTEST 消息。这使您可以让表单的某些部分响应鼠标事件，就像标题栏、边框等对带边框的窗口一样。例如，如果您的表单上有一个标签并且您HTCAPTION在WM_NCHITTEST处理程序中返回，您将能够通过拖动此标签来移动表单，就像您可以通过拖动其标题栏来移动常规窗口一样。有关示例代码，请参阅此Stack Overflow 问题。

Answer 4

Dim offSetX As Integer
Dim offSetY As Integer

Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
    Me.Location = New Point(Cursor.Position.X - offSetX, Cursor.Position.Y - offSetY)
End Sub

Private Sub Form1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseDown
    offSetX = PointToClient(Cursor.Position).X
    offSetY = PointToClient(Cursor.Position).Y
    Timer1.Enabled = True
End Sub

Private Sub Form1_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseUp
    Timer1.Enabled = False
End Sub

这是一种有点邋遢的做法 xD

希望它有所帮助=]