wpf - 具有 sharedsizegroup 的网格列在折叠或不可见时不是 'reclaim' 大小

Question

我有以下 xaml:

<Window x:Class="SharedSizeGroupBug.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">
<Window.Resources>
    <BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter" />
</Window.Resources>

<StackPanel Grid.IsSharedSizeScope="True">
    <ToggleButton IsChecked="False" Name="TB" Content="Toggle" />

    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="Auto" SharedSizeGroup="DZG" />
            <ColumnDefinition Width="Auto" />
        </Grid.ColumnDefinitions>

        <TextBlock Text="A1" Width="100" />
        <TextBlock Text="A2" Grid.Column="1" />
    </Grid>

    <Grid Visibility="{Binding IsChecked, ElementName=TB, Converter={StaticResource BooleanToVisibilityConverter}}">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="Auto" SharedSizeGroup="DZG" />
            <ColumnDefinition Width="Auto" />
        </Grid.ColumnDefinitions>

        <TextBlock Text="B1" Width="200" />
        <TextBlock Text="B2" Grid.Column="1" />
    </Grid>
</StackPanel>
</Window>

当您尝试这样做时，第一列的初始状态为 100 宽。当按下按钮并且第二个网格可见时，第一列的宽度为 200。但是，当您再次按下该按钮时，该列的宽度仍将是 200。

Answer 1

我遇到了同样的问题，但使用的是行而不是列。我终于用自定义 ivalue 绑定(bind)转换器打败了它，并基本上根据绑定(bind)可见性剥离/恢复共享大小的组。

这是转换器:

class VisibilityToSharedSizeGroupConverter : System.Windows.Data.IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return (((System.Windows.Visibility)value) == System.Windows.Visibility.Visible) ? parameter : null;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return System.Windows.Data.Binding.DoNothing;
    }
}

这是一个 XAML 示例:

<Window.Resources>
    <local:VisibilityToSharedSizeGroupConverter x:Key="VisToShared" />
</Window.Resources>
<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto" 
                       SharedSizeGroup="{Binding Converter={StaticResource ResourceKey=VisToShared}, ConverterParameter='LabelsGroup', ElementName=MyLabel1, Path=Visibility}"/>
        </RowDefinition>
    </Grid.RowDefinitions>
</Grid>