如何在网格中给出扩展程序的全宽度列
如何在网格中给出扩展程序的全宽度列
提问于 2021-04-12 20:54:55
我有一个Expander，它应该接收到列的全部宽度，但是我无法让它工作。
我试图将Horizontal(Content)Alignment = stretch添加到TextBlock和Expander上，甚至在Grid上也是如此，但它不起作用。
我需要的是Expander占用大约90%的宽度，其余的则分配给按钮，如下例所示：
我想显示一个名字，当你按下它时，展开并显示额外的信息，如果按下按钮，那么按钮后面的命令就会被执行(示例中没有绑定命令)。
<ListView
ItemsSource="{Binding log}"
SelectionMode="Multiple"
Style="{StaticResource ListViewStyle}">
<ListView.ItemTemplate>
<DataTemplate>
<Border BorderThickness="0,0,0,1" BorderBrush="Gray">
<Grid HorizontalAlignment="Stretch">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="100*" />
<ColumnDefinition Width="5*" />
<ColumnDefinition Width="5*" />
</Grid.ColumnDefinitions>
<Expander Grid.Column="0"
HorizontalAlignment="Stretch"
IsExpanded="{Binding Mode=TwoWay, Path=IsSelected, RelativeSource={RelativeSource AncestorType=ListBoxItem, Mode=FindAncestor}}"
Style="{StaticResource ExpanderStyle}">
<Expander.Header>
<TextBlock Text="{Binding Name}" Foreground="White"
HorizontalAlignment="Stretch" />
</Expander.Header>
<TextBlock
VerticalAlignment="Center"
FontSize="16"
Foreground="White"
Text="{Binding Description}" />
</Expander>
<Button Grid.Column="1"
Style="{StaticResource IconButton}">
<Button.Background>
<ImageBrush ImageSource="../icons/edit.png"
Stretch="None" />
</Button.Background>
</Button>
<dialogButton:ConfirmButton Grid.Column="2"
Question="{x:Static language:Strings.confirm}"
Style="{DynamicResource IconButton}"
Margin="0,0,10,0">
<dialogButton:ConfirmButton.Background>
<ImageBrush ImageSource="../icons/delete.png"
Stretch="None" />
</dialogButton:ConfirmButton.Background>
</dialogButton:ConfirmButton>
</Grid>
</Border>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>样式
<Style x:Key="ExpanderDownHeaderStyle" TargetType="{x:Type ToggleButton}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ToggleButton}">
<Border Padding="{TemplateBinding Padding}">
<Grid Background="Transparent" SnapsToDevicePixels="False">
<ContentPresenter HorizontalAlignment="Stretch" Margin="0" RecognizesAccessKey="True" SnapsToDevicePixels="True" VerticalAlignment="Center"/>
</Grid>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<Style x:Key="ExpanderStyle" TargetType="{x:Type Expander}">
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
<Setter Property="Background" Value="Transparent"/>
<Setter Property="HorizontalContentAlignment" Value="Stretch"/>
<Setter Property="VerticalContentAlignment" Value="Stretch"/>
<Setter Property="BorderBrush" Value="Transparent"/>
<Setter Property="BorderThickness" Value="1"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Expander}">
<Border Background="{TemplateBinding Background}" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}" CornerRadius="3" SnapsToDevicePixels="true">
<DockPanel>
<ToggleButton x:Name="HeaderSite" ContentTemplate="{TemplateBinding HeaderTemplate}" Content="{TemplateBinding Header}" ContentTemplateSelector="{TemplateBinding HeaderTemplateSelector}" DockPanel.Dock="Top" FontStyle="{TemplateBinding FontStyle}" FontStretch="{TemplateBinding FontStretch}" FontWeight="{TemplateBinding FontWeight}" FocusVisualStyle="{StaticResource ExpanderHeaderFocusVisual}" FontFamily="{TemplateBinding FontFamily}" Foreground="{TemplateBinding Foreground}" FontSize="{TemplateBinding FontSize}" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" IsChecked="{Binding IsExpanded, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" MinHeight="0" MinWidth="0" Margin="1" Padding="{TemplateBinding Padding}" Style="{StaticResource ExpanderDownHeaderStyle}" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"/>
<ContentPresenter x:Name="ExpandSite" DockPanel.Dock="Bottom" Focusable="false" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" Visibility="Collapsed"/>
</DockPanel>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsExpanded" Value="true">
<Setter Property="Visibility" TargetName="ExpandSite" Value="Visible"/>
</Trigger>
<Trigger Property="ExpandDirection" Value="Down">
<Setter Property="DockPanel.Dock" TargetName="ExpandSite" Value="Bottom"/>
<Setter Property="DockPanel.Dock" TargetName="HeaderSite" Value="Top"/>
<Setter Property="Background" Value="Transparent" />
<Setter Property="Style" TargetName="HeaderSite" Value="{StaticResource ExpanderDownHeaderStyle}"/>
</Trigger>
<Trigger Property="IsEnabled" Value="false">
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>我还尝试了以下线程中的内容
wpf - Header of Expander fit contents width?
这里的问题是Button被从视图中推开。
最好的解决方案是，如果Expander只接受列的宽度，那么我就可以通过Grid.ColumnDefinition来调整元素的宽度。
回答 1
Stack Overflow用户
回答已采纳
发布于 2021-04-13 06:20:31
问题是，在默认情况下，项目容器( ListViewItem )不会扩展其内容。您必须创建一个项目容器样式，以便将HorizontalContentAlignment设置为Stretch。
<ListView.ItemContainerStyle>
<Style TargetType="{x:Type ListViewItem}">
<Setter Property="HorizontalContentAlignment" Value="Stretch"/>
</Style>
</ListView.ItemContainerStyle>页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/67065561
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