Question

如何在单个级别而不是多个级别中共享“网格”列的大小？

<TreeView ItemsSource="{Binding MyItems}" Grid.IsSharedSizeScope="True">
    <TreeView.ItemTemplate>
        <HierarchicalDataTemplate ItemsSource="{Binding Children}">
            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="Auto" SharedSizeGroup="A"/>
                    <ColumnDefinition/>
                </Grid.ColumnDefinitions>

                <TextBlock Text="{Binding Name}"/>
                <TextBlock Text="{Binding Value}" Grid.Column="1"/>
            </Grid>

        </HierarchicalDataTemplate>
    </TreeView.ItemTemplate>
</TreeView>

这种作品，但是在整个树之间共享大小，这不是我想要的

Answer 1

这是我想出并认为可以分享的解决方案：

首先，我们需要一个转换器来标识我们所在的树的级别（this answer中经过稍微修改的代码）：

 public class TreeLevelConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            var level = -1;
            if (value is DependencyObject)
            {
                var parent = VisualTreeHelper.GetParent(value as DependencyObject);
                while (!(parent is TreeView) && (parent != null))
                {
                    if (parent is TreeViewItem)
                        level++;
                    parent = VisualTreeHelper.GetParent(parent);
                }
            }
            return (parameter?.ToString() ?? "") + ((char)('A' + level)); // the group name has to be a letter, numbers didn't work
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new System.NotImplementedException();
        }
    }

我们不能在XAML中使用绑定：

<TreeView ItemsSource="{Binding MyItems}" Grid.IsSharedSizeScope="True">
    <TreeView.ItemTemplate>
        <HierarchicalDataTemplate ItemsSource="{Binding Children}">
            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="Auto" SharedSizeGroup="{Binding RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type Grid}}, Converter={StaticResource TreeLevelConverter}, ConverterParameter=A}"/>
                    <ColumnDefinition Width="Auto" SharedSizeGroup="{Binding RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type Grid}}, Converter={StaticResource TreeLevelConverter}, ConverterParameter=B}"/>
                </Grid.ColumnDefinitions>

                <TextBlock Text="{Binding Name}"/>
                <TextBlock Text="{Binding Value}" Grid.Column="1"/>
            </Grid>

        </HierarchicalDataTemplate>
    </TreeView.ItemTemplate>
</TreeView>

使用转换器参数，可以在一个级别内实现多个组。

我希望这会对某人有所帮助

WPF TreeView在单个级别中共享网格列的大小

1 个答案: