仅当不使用gridsplitter时,网格列和行长度上的WPF转换器才有效

Question

在WPF中,我有一个布尔到长度转换器,我已经绑定到列和行定义.

此转换器用于读取绑定的布尔值,以确定是应隐藏还是显示行/列.

这样做是为了让我可以"最大化"网格的给定部分或将其恢复到原始大小.只要我不使用gridsplitter来调整大小,这就可以工作.一旦发生这种情况,它就不再设置所需的长度.我有一种感觉,一旦使用了gridsplitter,它就会删除对列定义的绑定.有没有解决这个问题？

变流器

[ValueConversion(typeof(bool), typeof(GridLength))]
public class BoolToGridLengthConverter : IValueConverter
{
    public int Length { get; set; }

    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return ((bool)value == true) ? new GridLength(Length == 0 ? 1 : Length, GridUnitType.Star) : new GridLength(0);
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {    // Don't need any convert back
        return null;
    }
}

XAML

<Grid>
    <Grid.Resources>
        <helpers:BoolToGridLengthConverter x:Key="BoolToGridLengthConverter1" Length="1" />
        <helpers:BoolToGridLengthConverter x:Key="BoolToGridLengthConverter2" Length="2" />
    </Grid.Resources>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="{Binding ShowColumn1, Mode=TwoWay, Converter={StaticResource BoolToGridLengthConverter1}}" />
        <ColumnDefinition Width="5" />
        <ColumnDefinition Width="{Binding ShowColumn2, Mode=TwoWay, Converter={StaticResource BoolToGridLengthConverter1}}" />
        <ColumnDefinition Width="5" />
        <ColumnDefinition Width="{Binding ShowColumn3, Mode=TwoWay, Converter={StaticResource BoolToGridLengthConverter1}}" />
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
        <RowDefinition Height="{Binding ShowRow1, Mode=TwoWay, Converter={StaticResource BoolToGridLengthConverter1}}" />
        <RowDefinition Height="5" />
        <RowDefinition Height="{Binding ShowRow2, Mode=TwoWay, Converter={StaticResource BoolToGridLengthConverter2}}" />
    </Grid.RowDefinitions>
    <Grid Grid.Column="0" Grid.ColumnSpan="5" Grid.Row="0"></Grid>
    <GridSplitter Grid.Column="0" Grid.ColumnSpan="5" Grid.Row="1" ResizeDirection="Rows" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Height="5" />
    <Grid Grid.Column="0" Grid.Row="2"></Grid>
    <GridSplitter Grid.Column="1" Grid.Row="2" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Width="5" />
    <Grid Grid.Column="2" Grid.Row="2"></Grid>
    <GridSplitter Grid.Column="3" Grid.Row="2" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Width="5" />
    <Grid Grid.Column="4" Grid.Row="2"></Grid>
</Grid>

编辑:重组问题以包含更多XAML

编辑:附加信息,当我想扩展网格部分时,我将所有布尔值设置为false并将我想要的部分设置为true.例如,如果我希望最大化Grid.Column 2和Grid.Row 2,我将所有布尔值设置为false,除了ShowColumn2和ShowRow2.这可以按预期工作,当布尔值全部设置为true时,为了获得原始视图,它也可以按预期工作.问题是,一旦我使用gridsplitter调整列的大小,它就像以前一样不起作用.当我最大化相同的部分时,它工作正常,但当我尝试调整大小恢复到原始大小Grid.Column 2和Grid.Row 2占用整个底部行.除了它们之外的两列最小化.

这让我相信,当使用网格探测器时,转换器将无法再将列的值设置为true.

Answer 1

在您的中，ColumnDefinition您需要将 设为MaxWidth零以隐藏Column并将MaxHeight设为零Row。

尝试以下转换器：

[ValueConversion(typeof(bool), typeof(double))]
public class BoolToMaxConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return ((bool)value == true) ? double.MaxValue : 0d;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {    // Don't need any convert back
        return null;
    }
}

和你的xaml：

<Grid>
    <Grid.Resources>
        <local:BoolToMaxConverter x:Key="BoolToMaxConverter" />
    </Grid.Resources>
    <Grid.ColumnDefinitions>
        <ColumnDefinition MaxWidth="{Binding ShowColumn1, Converter={StaticResource BoolToMaxConverter}}"  />
        <ColumnDefinition Width="5" />
        <ColumnDefinition MaxWidth="{Binding ShowColumn2, Converter={StaticResource BoolToMaxConverter}}" />
        <ColumnDefinition Width="5" />
        <ColumnDefinition MaxWidth="{Binding ShowColumn3, Converter={StaticResource BoolToMaxConverter}}" />
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
        <RowDefinition MaxHeight="{Binding ShowRow1, Converter={StaticResource BoolToMaxConverter}}" />
        <RowDefinition Height="5" />
        <RowDefinition  MaxHeight="{Binding ShowRow2, Converter={StaticResource BoolToMaxConverter}}" />
    </Grid.RowDefinitions>
    <Grid Grid.Column="0" Grid.ColumnSpan="5" Grid.Row="0"></Grid>
    <GridSplitter Grid.Column="0" Grid.ColumnSpan="5" Grid.Row="1" ResizeDirection="Rows" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Height="5" />
    <Grid Grid.Column="0" Grid.Row="2"></Grid>
    <GridSplitter Grid.Column="1" Grid.Row="2" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Width="5" />
    <Grid Grid.Column="2" Grid.Row="2"></Grid>
    <GridSplitter Grid.Column="3" Grid.Row="2" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Width="5" />
    <Grid Grid.Column="4" Grid.Row="2"></Grid>
</Grid>

还可以考虑删除TwoWay-Binding。