Question

我似乎遇到了WPF GridSplitter的一个奇怪问题。

如果我这样做：

<Window x:Class="WpfApplication20.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="102" />
            <RowDefinition Height="1" />
            <RowDefinition Height="192" />
        </Grid.RowDefinitions>
        <GridSplitter Grid.Row="1" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" ResizeDirection="Rows" Background="Black"></GridSplitter>
        <Canvas Grid.Row="0" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Background="AliceBlue"></Canvas>
        <Canvas Grid.Row="2" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Background="Yellow"></Canvas>       
    </Grid>
</Window>

我可以看到GridSplitter，但我无法与它交互 - 将鼠标悬停在它上面，光标不会改变，也无法用它调整行数。

现在，如果我更改添加到网格中的元素的顺序：

<Window x:Class="WpfApplication20.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="102" />
            <RowDefinition Height="1" />
            <RowDefinition Height="192" />
        </Grid.RowDefinitions>
        <Canvas Grid.Row="0" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Background="AliceBlue"></Canvas>
        <Canvas Grid.Row="2" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Background="Yellow"></Canvas>
        <GridSplitter Grid.Row="1" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" ResizeDirection="Rows" Background="Black"></GridSplitter>
</Grid>
</Window>

然后GridSplitter工作正常。请注意，我将Panel.ZIndex="1"放在GridSplitter的第一种情况下，它也可以工作。

然后我尝试了这个（将UseLayoutRounding="True"添加到Window）：

<Window x:Class="WpfApplication20.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525" UseLayoutRounding="True">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="102" />
            <RowDefinition Height="1" />
            <RowDefinition Height="192" />
        </Grid.RowDefinitions>
        <GridSplitter Grid.Row="1" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" ResizeDirection="Rows" Background="Black"></GridSplitter>
        <Canvas Grid.Row="0" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Background="AliceBlue"></Canvas>
        <Canvas Grid.Row="2" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Background="Yellow"></Canvas>
</Grid>
</Window>

这给了我一个奇怪的行为：最初绘制的Gridsplitter高度为2px（子像素定位？但所有网格行都是整数高度）。如果我向上调整行的大小，GridSplitter将继续工作。如果我向下调整行的大小，我将达到以1px的高度绘制GridSplitter的点，一旦我释放鼠标，我就无法再与GridSplitter交互。

问题：

为什么GridSplitter在前两种情况下依赖Z-order工作？
为什么GridSplitter在第三种情况下“间歇性地”工作？

WPF GridSplitter没有经过热门测试？

0 个答案: