停止Gridsplitter将内容拉伸到窗口之外

Question

鉴于以下XAML,我如何让gridsplitter尊重给第3行的MinHeight并将内容保留在我的窗口内？

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto" />
        <RowDefinition Height="Auto" />
        <RowDefinition MinHeight="40" />
    </Grid.RowDefinitions>
    <Expander Grid.Row="0" ExpandDirection="Down" VerticalAlignment="Top">
        <Grid>
            <Grid.RowDefinitions>
                <RowDefinition Height="Auto" MinHeight="40" />
                <RowDefinition Height="*" />
            </Grid.RowDefinitions>
            <Border Grid.Row="0" MinHeight="100" Background="Black" />
            <GridSplitter Grid.Row="1" Height="5" HorizontalAlignment="Stretch" VerticalAlignment="Bottom" Background="LightBlue" ResizeBehavior="PreviousAndCurrent" />
        </Grid>
    </Expander>
    <Expander Grid.Row="1" ExpandDirection="Down" VerticalAlignment="Top">
        <Grid>
            <Grid.RowDefinitions>
                <RowDefinition Height="Auto" MinHeight="40" />
                <RowDefinition Height="*" />
            </Grid.RowDefinitions>
            <Border Grid.Row="0" MinHeight="100" Background="Black" />
            <GridSplitter Grid.Row="1" Height="5" HorizontalAlignment="Stretch" VerticalAlignment="Bottom" Background="LightBlue" ResizeBehavior="PreviousAndCurrent" />
        </Grid>
    </Expander>
    <Border DockPanel.Dock="Bottom"  Grid.Row="2" Background="Lime" MinHeight="30" >
        <TextBlock Text="{Binding RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=DockPanel},Path=ActualHeight,StringFormat={}{0:f0}}" />
    </Border>
</Grid>

Answer 1

你的代码的方式,这是不能完成交配的.这是由于GridSplitter的工作原理.

几点

• GridSplitter将始终在直接相邻的行/列上工作
• 实际上,您的MinHeight IS受到尊重,但GridSplitter的增长请求也受到尊重,这导致网格增长大于您的窗口
• 当大小设置为Auto时,行/列将始终根据其内容调整大小,而不是更大,而不是更小
• 因此,如果GridSplitter夹在两个*大小的行/列之间,那么它会隐含地尊重你的MinHeight,因为实际上它不会触及它

你有几个解决方案

1. 在第3个位置添加另一行*size,并在第3行使用RowSpan为2的边框(因此第3行是真正调整大小的行,而第4行未触及.虽然这也有副作用.
2. 在GridSplitter上处理DragEnter和PreviewMouseMove事件的混合,跟踪焦点,并在达到特定大小时取消(e.Handled = true)事件.

这是我能想到的伙伴,希望我能得到一些帮助.