Question

我有一个网格中有矩形的控件。我可以在网格中将矩形从一个单元格拖动到另一个单元格。但我还需要双击矩形以显示编辑对话框。这里的问题是，只需在矩形上按下鼠标左键就会发起MouseMove事件，并导致DragDrop在不需要时启动。

以下是MouseMove和MouseDoubleClick事件处理程序：

Dim IsDragging As Boolean = False
Private Sub SchedItem_MouseMove(sender As Object, e As MouseEventArgs) Handles Me.MouseMove
    If IsDragging Then Exit Sub
    If e.LeftButton = MouseButtonState.Pressed Then
        Dispatcher.InvokeAsync(Sub()
                                   IsDragging = True
                                   DragDrop.DoDragDrop(Me, Me, DragDropEffects.Move)
                                   IsDragging = False
                               End Sub)
    End If
End Sub

Private Sub SchedItem_PreviewMouseDoubleClick(sender As Object, e As MouseButtonEventArgs) Handles Me.PreviewMouseDoubleClick
    itmEditTask_Click(Nothing, Nothing)
    e.Handled = True
End Sub

我尝试确定自MouseMove事件以来鼠标移动的距离，因此尝试不启动MouseLeftButtonDown。但x＆amp; y数字到处都是，我无法可靠地设置阈值。这是代码：

Private mPos As Point
Private Sub SchedItem_MouseLeftButtonDown(sender As Object, e As MouseButtonEventArgs) Handles Me.MouseLeftButtonDown
    mPos = Mouse.GetPosition(Nothing)
End Sub

Private Function IsReallyMouseMove() As Boolean
    Dim pPos As Point = Mouse.GetPosition(Nothing)
    Debug.WriteLine(Math.Abs(mPos.X - pPos.X) & ", " & Math.Abs(mPos.Y - pPos.Y))
    IsReallyMouseMove = Math.Abs(mPos.X - pPos.X) > 10 OrElse Math.Abs(mPos.Y - pPos.Y) > 10
End Function

所以我希望有人这样做并且可以提供一些方向。

Answer 1

最佳方式 - 重新设计。使项目元素中的某个对象可拖动项目。（也许用不同的拖动光标小点）其他区域将处理双击。

WPF - 如何在MouseDoubleClick上执行DragDrop？

1 个答案: