英文:
Top Dock in a DockPanel is taking all the space
问题
我的代码看起来类似于以下内容：
<DockPanel><Expander DockPanel.Dock="Top" Name="Expander1"><local:ListView1 DataContext="{Binding Source1}"/></Expander><Expander DockPanel.Dock="Top" Name="Expander2"><local:ListView1 DataContext="{Binding Source2}"/></Expander><Expander DockPanel.Dock="Top" Name="Expander3"><local:ListView1 DataContext="{Binding Source3}"/></Expander></DockPanel>
ListView1只是一个包含ListView的用户控件。
我已经设置了以下行为：当一个Expander打开时，其他两个Expander将关闭。
问题是，当Expander1打开并且其内容超过窗口高度时，它将具有滚动条以滚动其内容，而Expander2和Expander3不会显示。我认为Expander1占据了UI上的所有空间，将Expander2和Expander3推出了UI。当Expander2打开时，Expander3被推出了UI并且不会显示。我应该怎么做，以便打开一个Expander时，其下面的Expander不会被推出UI？
英文:
My code looks something like this:
<DockPanel><Expander DockPanel.Dock="Top" Name="Expander1"><local:ListView1 DataContext="{Binding Source1}"/></Expander><Expander DockPanel.Dock="Top" Name="Expander2"><local:ListView1 DataContext="{Binding Source2}"/></Expander><Expander DockPanel.Dock="Top" Name="Expander3"><local:ListView1 DataContext="{Binding Source3}"/></Expander></DockPanel>
ListView1 is just a user control that contains a ListView
I have the behavior set: when one Expander is open, all the other 2 Expanders will close.
The problem is that when Expander1 is open and its content is more than the window height, it will have a scroll bar to scroll down for its content while Expander2 and Expander3 are not displayed. I think Expander1 uses all the space on the UI and Expander2 & Expander3 get pushed out side of the UI. When Expander2 is open, Expander3 is pushed out of the UI and not displayed. What can I do so that when I open an Expander, the one(s) below it won't get pushed out of the UI?
答案1
得分: 1
你说你一次只允许打开一个。
鉴于此，尺寸逻辑更简单，你可以只使用一个带有固定数字的转换器。
我的演示：
<DockPanel><Expander DockPanel.Dock="Top" MaxHeight="{Binding ActualHeight,RelativeSource={RelativeSource AncestorType=ContentPresenter},Converter={local:AddConverter ValueToAdd=-46}}"><ListBox ItemsSource="{Binding Items}"/></Expander><Expander DockPanel.Dock="Top" MaxHeight="{Binding ActualHeight,RelativeSource={RelativeSource AncestorType=ContentPresenter},Converter={local:AddConverter ValueToAdd=-46}}"><ListBox ItemsSource="{Binding Items}"/></Expander><Expander DockPanel.Dock="Top" MaxHeight="{Binding ActualHeight,RelativeSource={RelativeSource AncestorType=ContentPresenter},Converter={local:AddConverter ValueToAdd=-46}}"><ListBox ItemsSource="{Binding Items}"/></Expander></DockPanel>
以及转换器：
public class AddConverter : MarkupExtension, IValueConverter{public double ValueToAdd { get; set; }public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture){double bound = (Double)value;return bound + ValueToAdd;}public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture){return null;}public override object ProvideValue(IServiceProvider serviceProvider){return this;}}
正如我在评论中提到的，
你可以使用多绑定和多转换器来更加复杂化这个过程。这可以允许在打开两个时设置高度。
英文:
You said you're only allowing one open at a time.
Given that then the size logic is simpler and you could use just a converter with a fixed number.
My PoC:
<DockPanel><Expander DockPanel.Dock="Top" MaxHeight="{Binding ActualHeight,RelativeSource={RelativeSource AncestorType=ContentPresenter},Converter={local:AddConverter ValueToAdd=-46}}"><ListBox ItemsSource="{Binding Items}"/></Expander><Expander DockPanel.Dock="Top" MaxHeight="{Binding ActualHeight,RelativeSource={RelativeSource AncestorType=ContentPresenter},Converter={local:AddConverter ValueToAdd=-46}}"><ListBox ItemsSource="{Binding Items}"/></Expander><Expander DockPanel.Dock="Top" MaxHeight="{Binding ActualHeight,RelativeSource={RelativeSource AncestorType=ContentPresenter},Converter={local:AddConverter ValueToAdd=-46}}"><ListBox ItemsSource="{Binding Items}"/></Expander></DockPanel>
And the converter
public class AddConverter : MarkupExtension, IValueConverter{public double ValueToAdd { get; set; }public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture){double bound = (Double)value;return bound + ValueToAdd;}public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture){return null;}public override object ProvideValue(IServiceProvider serviceProvider){return this;}}
As I mentioned in the comments.
You could make this more sophisticated with a multibinding and multiconverter. That could allow for height when 2 are open.
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