wpf - 调整大小后的WPF GridSplitter

一旦使用gridsplitter调整了网格的大小，当其他行折叠时，行*将不会回收空间。

我在具有三行的主详细信息 View 中具有以下网格。数据网格位于中间的拆分器顶部，最后一行是contentcontrol View 。拆分器上有一个关闭按钮以折叠细节。除了用户使用gridsplitter调整大小后，所有这些都可以使用。

    <Grid Margin="3,0">
    <Grid.RowDefinitions>
        <RowDefinition Height="*"/>
        <RowDefinition Style="{StaticResource CollapsableRow}"/><!-- Splitter Here -->
        <RowDefinition Style="{StaticResource CollapsableRow}"/>
    </Grid.RowDefinitions>

GridSplitter样式:

    <Style x:Key="gridSplitterStyle" TargetType="{x:Type GridSplitter}">
    <Setter Property="Visibility" Value="{Binding IsItemSelected, Converter={StaticResource BoolToShow},ConverterParameter='Visible|Collapsed'}" />
    <Setter Property="Width" Value="Auto"/>
    <Setter Property="Height" Value="14"/>
    <Setter Property="HorizontalAlignment" Value="Stretch"/>
    <Setter Property="Border.BorderBrush" Value="#FF6593CF" />
    <Setter Property="Border.BorderThickness" Value="0,1,0,0" />
    <Setter Property="UIElement.SnapsToDevicePixels" Value="True" />
    <Setter Property="UIElement.Focusable" Value="False" />
    <Setter Property="Control.Padding" Value="7,7,7,7" />
    <Setter Property="Cursor" Value="SizeNS" /></Style>

就像我说的那样，除非使用gridsplitter调整大小，否则折叠工作正常。之后，空白将保留。

编辑:
H.B.和Codenaked提出了简单而一致的建议，因此，我尝试在数据触发器中成功实现它们:

<Style x:Key="CollapsableRow" TargetType="{x:Type RowDefinition}">
    <Style.Triggers>
        <DataTrigger Binding="{Binding SelectedItem, Converter={StaticResource IsNullConverter}}" Value="True">
            <Setter Property="RowDefinition.Height" Value="0"/>
        </DataTrigger>
        <DataTrigger Binding="{Binding SelectedItem, Converter={StaticResource IsNullConverter}}" Value="False">
            <Setter Property="RowDefinition.Height" Value="Auto"/>
        </DataTrigger>
    </Style.Triggers>
</Style>

最佳答案

由于网格拆分器和详细信息已被隐藏，因此，“可见性”是重置下一行定义高度的明显选择。

 /// <summary>
/// Grid splitter that show or hides the following row when the visibility of the splitter is changed.
/// </summary>
public class HidableGridSplitter : GridSplitter {

    GridLength height;

    public HidableGridSplitter()
    {
        this.IsVisibleChanged += HideableGridSplitter_IsVisibleChanged;
        this.Initialized += HideableGridSplitter_Initialized;
    }

    void HideableGridSplitter_Initialized(object sender, EventArgs e)
    {
        //Cache the initial RowDefinition height,
        //so it is not always assumed to be "Auto"
        Grid parent = base.Parent as Grid;
        if (parent == null) return;
        int rowIndex = Grid.GetRow(this);
        if (rowIndex + 1 >= parent.RowDefinitions.Count) return;
        var lastRow = parent.RowDefinitions[rowIndex + 1];
        height = lastRow.Height;
    }

    void HideableGridSplitter_IsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e)
    {
        Grid parent = base.Parent as Grid;
        if (parent == null) return;

        int rowIndex = Grid.GetRow(this);

        if (rowIndex + 1 >= parent.RowDefinitions.Count) return;

        var lastRow = parent.RowDefinitions[rowIndex + 1];

        if (this.Visibility == Visibility.Visible)
        {
            lastRow.Height = height;
        }
        else
        {
            height = lastRow.Height;
            lastRow.Height = new GridLength(0);
        }

    }

关于wpf - 调整大小后的WPF GridSplitter，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/5955186/