WPF GridSplitter可视性

Question

我有一个关于GridSplitter可视性的问题。

在这种情况下，无论我托管一个Winform DataGridView。拖动时，GridSplitter在其他控件上正确可见。但不是在这个网格上。实际上，无论我托管的是什么，而不是Datagridview，它都会成为最顶层的控件，这使得GridSplitter隐藏在它的后面。

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Name="rowForButton"/>
        <RowDefinition Name="rowForGridSplitter" Height="Auto" MinHeight="81" />
    </Grid.RowDefinitions>
    <Button Grid.Row="0" Height="50" Width="110" Content="Button in First Row"/>
    <my:WindowsFormsHost Panel.ZIndex="0" Grid.Row="1"  Margin="30,11,138,0" x:Name="winHost" Height="58" VerticalAlignment="Top" OpacityMask="Transparent">            
        <win:DataGridView x:Name="dataGridView"></win:DataGridView>
    </my:WindowsFormsHost>        
    <GridSplitter  BorderThickness="1" Panel.ZIndex="1" Grid.Row="1" HorizontalAlignment="Stretch" Height="5" ShowsPreview="True" VerticalAlignment="Top">
    </GridSplitter>
</Grid>

Answer 1

Windows窗体控件始终独立于WPF控件呈现，因此将始终显示在WPF应用程序上。

有关更多信息，请参阅Hosting a Microsoft Win32 Window in WPF (副标题输出行为的显著差异)。

Answer 2

通常，您应该将一个GridSplitter放入它自己的网格单元格中，或者确保没有任何控件可以与它重叠。但我不知道这是否适用于这里的你。另请参见here。

Answer 3

我也遇到了这个问题，下面是我的解决方案：

var splitter = new GridSplitter()
        {
            HorizontalAlignment = HorizontalAlignment.Stretch,
            VerticalAlignment = VerticalAlignment.Stretch,
            FocusVisualStyle = null,
            ShowsPreview = true,
            Background = new SolidColorBrush(new Color() { R = 1, G = 1, B = 1, A = 1 }),
        };

// non-style / essential window which will display over your WinForm control
var PopupWindowForSplitter = new PopupWindow()
        {
            Background = new SolidColorBrush(new Color() { R = 1, G = 1, B = 1, A = 1 }),
            Visibility = Visibility.Collapsed
        };
PopupWindowForSplitter.Show();
...

Point _ptForSplitterDrag = new Point(0,0);

splitter.DragStarted += (o, e) =>
        {
            var pt = splitter.PointToScreen(new Point());
            _ptForSplitterDrag = splitter.PointToScreen(Mouse.GetPosition(splitter));
            PopupWindowForSplitter.Left = pt.X;
            PopupWindowForSplitter.Top = pt.Y;
            PopupWindowForSplitter.Height = splitter.ActualHeight;
            PopupWindowForSplitter.Width = splitter.ActualWidth;
            PopupWindowForSplitter.Activate();
            PopupWindowForSplitter.Visibility = Visibility.Visible;
        };
        splitter.DragDelta += (o, e) =>
        {
            var pt = splitter.PointToScreen(Mouse.GetPosition(splitter)) - _ptForSplitterDrag
                + splitter.PointToScreen(new Point());
            if (splitter.ResizeDirection == GridResizeDirection.Rows)
            {
                PopupWindowForSplitter.Top = pt.Y;
            }
            else
            {
                PopupWindowForSplitter.Left = pt.X;
            }
        };
        splitter.DragCompleted += (o, e) =>
        {
            var initializeData = typeof(GridSplitter).GetMethod("InitializeData", BindingFlags.NonPublic | BindingFlags.Instance);
            var moveSplitter = typeof(GridSplitter).GetMethod("MoveSplitter", BindingFlags.NonPublic | BindingFlags.Instance);
            if (moveSplitter != null && initializeData != null)
            {
                initializeData.Invoke(splitter, new object[] { true });

                var pt = splitter.PointToScreen(Mouse.GetPosition(splitter)) - _ptForSplitterDrag;
                if (splitter.ResizeDirection == GridResizeDirection.Rows)
                {
                    moveSplitter.Invoke(splitter, new object[] { 0, pt.Y });
                }
                else
                {
                    moveSplitter.Invoke(splitter, new object[] { pt.X, 0 });
                }
            }
            PopupWindowForSplitter.Visibility = Visibility.Collapsed;
        };

也许我的描述中有一些问题，因为我的英语很差，但我认为代码足以解释它。