我创建了一个自定义 WPF 元素，该元素从该元素扩展而来RowDefinition，当Collapsed元素的属性设置为True.
它通过在样式中使用转换器和数据触发器来将行的高度设置为 0。它基于此SO Answer。
在下面的示例中，当网格拆分器位于窗口的一半以上时，这非常有效。但是，当它不到一半时，行仍然折叠，但第一行没有展开。取而代之的是，在过去的行中只有一个白色间隙。这可以在下图中看到。
类似地，如果在任何折叠的行上设置了MinHeight或MaxHeight，则它根本不再折叠该行。我试图通过在数据触发器中为这些属性添加设置器来解决这个问题，但它没有解决它。
MinHeight我的问题是可以做些什么不同的事情，以便行的大小或是否设置/无关紧要MaxHeight，它只是能够折叠行？
MCVE
主窗口.xaml.cs
using System;
using System.ComponentModel;
using System.Globalization;
using System.Runtime.CompilerServices;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
namespace RowCollapsibleMCVE
{
public partial class MainWindow : INotifyPropertyChanged
{
public MainWindow()
{
InitializeComponent();
DataContext = this;
}
public event PropertyChangedEventHandler PropertyChanged;
private void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
private bool isCollapsed;
public bool IsCollapsed
{
get => isCollapsed;
set
{
isCollapsed = value;
OnPropertyChanged();
}
}
}
public class CollapsibleRow : RowDefinition
{
#region Default Values
private const bool COLLAPSED_DEFAULT = false;
private const bool INVERT_COLLAPSED_DEFAULT = false;
#endregion
#region Dependency Properties
public static readonly DependencyProperty CollapsedProperty =
DependencyProperty.Register("Collapsed", typeof(bool), typeof(CollapsibleRow), new PropertyMetadata(COLLAPSED_DEFAULT));
public static readonly DependencyProperty InvertCollapsedProperty =
DependencyProperty.Register("InvertCollapsed", typeof(bool), typeof(CollapsibleRow), new PropertyMetadata(INVERT_COLLAPSED_DEFAULT));
#endregion
#region Properties
public bool Collapsed {
get => (bool)GetValue(CollapsedProperty);
set => SetValue(CollapsedProperty, value);
}
public bool InvertCollapsed {
get => (bool)GetValue(InvertCollapsedProperty);
set => SetValue(InvertCollapsedProperty, value);
}
#endregion
}
public class BoolVisibilityConverter : IMultiValueConverter
{
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
if (values.Length > 0 && values[0] is bool collapsed)
{
if (values.Length > 1 && values[1] is bool invert && invert)
{
collapsed = !collapsed;
}
return collapsed ? Visibility.Collapsed : Visibility.Visible;
}
return Visibility.Collapsed;
}
public object[] ConvertBack(object value, Type[] targetType, object parameter, CultureInfo culture)
{
throw new NotSupportedException();
}
}
}
主窗口.xaml
<Window x:Class="RowCollapsibleMCVE.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:RowCollapsibleMCVE"
mc:Ignorable="d"
Title="MainWindow" Height="450" Width="800">
<Window.Resources>
<Visibility x:Key="CollapsedVisibilityVal">Collapsed</Visibility>
<local:BoolVisibilityConverter x:Key="BoolVisibilityConverter"/>
<Style TargetType="{x:Type local:CollapsibleRow}">
<Style.Triggers>
<DataTrigger Value="{StaticResource CollapsedVisibilityVal}">
<DataTrigger.Binding>
<MultiBinding Converter="{StaticResource BoolVisibilityConverter}">
<Binding Path="Collapsed"
RelativeSource="{RelativeSource Self}"/>
<Binding Path="InvertCollapsed"
RelativeSource="{RelativeSource Self}"/>
</MultiBinding>
</DataTrigger.Binding>
<DataTrigger.Setters>
<Setter Property="MinHeight" Value="0"/>
<Setter Property="Height" Value="0"/>
<Setter Property="MaxHeight" Value="0"/>
</DataTrigger.Setters>
</DataTrigger>
</Style.Triggers>
</Style>
</Window.Resources>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<CheckBox Content="Collapse Row"
IsChecked="{Binding IsCollapsed}"/>
<Grid Row="1">
<Grid.RowDefinitions>
<local:CollapsibleRow Height="3*" />
<local:CollapsibleRow Height="Auto" />
<local:CollapsibleRow Collapsed="{Binding IsCollapsed}" Height="*" /> <!-- Using [MaxHeight="300"] breaks this completely -->
</Grid.RowDefinitions>
<StackPanel Background="Red"/>
<GridSplitter Grid.Row="1"
Height="10"
HorizontalAlignment="Stretch">
<GridSplitter.Visibility>
<MultiBinding Converter="{StaticResource BoolVisibilityConverter}" >
<Binding Path="IsCollapsed"/>
</MultiBinding>
</GridSplitter.Visibility>
</GridSplitter>
<StackPanel Background="Blue"
Grid.Row="2">
<StackPanel.Visibility>
<MultiBinding Converter="{StaticResource BoolVisibilityConverter}" >
<Binding Path="IsCollapsed"/>
</MultiBinding>
</StackPanel.Visibility>
</StackPanel>
</Grid>
</Grid>
</Window>