WPF 拉伸列表框高度为 Grid.Row 的 100%?

发布于 2024-10-24 11:26:41 字数 5306 浏览 1 评论 0原文

我试图将 ListBox 的高度拉伸为父网格高度的 100%(即父视图高度的 90%);即使列表框为空。我应该注意到,VerticalAlignment="Stretch" 似乎不起作用,因此我已将其从 ListBoxStackPanel 元素中删除。截至目前,ListBox 仅根据需要伸展,以容纳其包含的项目数量。我知道行定义应该有效,但如果两个列表都是空的,它们都会缩小到几个像素高(以及网格行)。尽管有明确的高度声明,是否会导致这些行收缩?

<Grid.ColumnDefinitions>
        <ColumnDefinition Width=".24*"/>
        <ColumnDefinition Width=".73*"/>
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
        <RowDefinition Height=".9*"/>
        <RowDefinition Height=".1*"/>
    </Grid.RowDefinitions>
    <ListBox Grid.Column="0" Grid.Row="0" Name="Subdivisions" SelectedItem="{Binding SelectedSubdivisionViewModel}" ItemsSource="{Binding Path=Subdivisions}" Grid.IsSharedSizeScope="True">
        <ListBox.ItemTemplate>
            <DataTemplate>
                <StackPanel>
                    <Border BorderBrush="#FF4788c8" BorderThickness="1,1,1,1" CornerRadius="8,8,8,8">
                        <Expander IsExpanded="{Binding IsSelected, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ListBoxItem}}}">
                            <Expander.Header>
                                <StackPanel>
                                    <Grid>
                                        <Grid.ColumnDefinitions>
                                            <ColumnDefinition Width="*" SharedSizeGroup="col1" />
                                            <ColumnDefinition Width=".1*" SharedSizeGroup="col2" />
                                            <ColumnDefinition Width="*" SharedSizeGroup="col3" />
                                        </Grid.ColumnDefinitions>
                                        <Grid.RowDefinitions>
                                            <RowDefinition/>
                                            <RowDefinition/>
                                        </Grid.RowDefinitions>
                                        <TextBlock Grid.Column="0" Grid.Row="0">
                                            <TextBlock.Text>
                                                <MultiBinding StringFormat="Name: {0}">
                                                  <Binding Path="SubdivisionName" />
                                                  <Binding Path="SubdivisionID" />
                                                </MultiBinding>
                                            </TextBlock.Text>
                                        </TextBlock>
                                        <TextBlock Grid.Column="2" Grid.Row="0">
                                            <TextBlock.Text>
                                                <MultiBinding StringFormat="ID: {0}">
                                                  <Binding Path="SubdivisionName" />
                                                  <Binding Path="SubdivisionID" />
                                                </MultiBinding>
                                            </TextBlock.Text>
                                        </TextBlock>
                                        <TextBlock Grid.Column="2" Grid.Row="1">
                                            <TextBlock.Text>
                                                <MultiBinding StringFormat="ID: {0}">
                                                  <Binding Path="SubdivisionName" />
                                                  <Binding Path="SubdivisionID" />
                                                </MultiBinding>
                                            </TextBlock.Text>
                                        </TextBlock>
                                    </Grid>
                                </StackPanel>
                            </Expander.Header>
                            <StackPanel>
                                <Grid>
                                    <Grid.ColumnDefinitions>
                                        <ColumnDefinition Width="*"/>
                                        <ColumnDefinition/>
                                        <ColumnDefinition/>
                                    </Grid.ColumnDefinitions>
                                    <Grid.RowDefinitions>
                                        <RowDefinition />
                                        <RowDefinition />
                                    </Grid.RowDefinitions>
                                    <TextBlock Text="{Binding ElementName=SubdivisionID}" />
                                    <TextBlock Text="{Binding Path=SubdivisionID}" />
                                </Grid>
                            </StackPanel>
                        </Expander>
                    </Border>
                </StackPanel>
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>

I'm attempting to stretch the height of a ListBox 100% of the height of the parent grid (i.e. 90% of the height of the parent view); even if the listboxes are empty. I should note that VerticalAlignment="Stretch" doesn't seem to work, so I've removed it from the ListBox and StackPanel elements. As of now, the ListBox only stretches as far as it needs to in order to accommodate the number of items it contains. I understand that the row definitions should work but if both lists are empty, they both shrink to a few pixels tall (along with the grid rows). Could something cause these rows to shrink despite the explicit height declaration?

<Grid.ColumnDefinitions>
        <ColumnDefinition Width=".24*"/>
        <ColumnDefinition Width=".73*"/>
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
        <RowDefinition Height=".9*"/>
        <RowDefinition Height=".1*"/>
    </Grid.RowDefinitions>
    <ListBox Grid.Column="0" Grid.Row="0" Name="Subdivisions" SelectedItem="{Binding SelectedSubdivisionViewModel}" ItemsSource="{Binding Path=Subdivisions}" Grid.IsSharedSizeScope="True">
        <ListBox.ItemTemplate>
            <DataTemplate>
                <StackPanel>
                    <Border BorderBrush="#FF4788c8" BorderThickness="1,1,1,1" CornerRadius="8,8,8,8">
                        <Expander IsExpanded="{Binding IsSelected, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ListBoxItem}}}">
                            <Expander.Header>
                                <StackPanel>
                                    <Grid>
                                        <Grid.ColumnDefinitions>
                                            <ColumnDefinition Width="*" SharedSizeGroup="col1" />
                                            <ColumnDefinition Width=".1*" SharedSizeGroup="col2" />
                                            <ColumnDefinition Width="*" SharedSizeGroup="col3" />
                                        </Grid.ColumnDefinitions>
                                        <Grid.RowDefinitions>
                                            <RowDefinition/>
                                            <RowDefinition/>
                                        </Grid.RowDefinitions>
                                        <TextBlock Grid.Column="0" Grid.Row="0">
                                            <TextBlock.Text>
                                                <MultiBinding StringFormat="Name: {0}">
                                                  <Binding Path="SubdivisionName" />
                                                  <Binding Path="SubdivisionID" />
                                                </MultiBinding>
                                            </TextBlock.Text>
                                        </TextBlock>
                                        <TextBlock Grid.Column="2" Grid.Row="0">
                                            <TextBlock.Text>
                                                <MultiBinding StringFormat="ID: {0}">
                                                  <Binding Path="SubdivisionName" />
                                                  <Binding Path="SubdivisionID" />
                                                </MultiBinding>
                                            </TextBlock.Text>
                                        </TextBlock>
                                        <TextBlock Grid.Column="2" Grid.Row="1">
                                            <TextBlock.Text>
                                                <MultiBinding StringFormat="ID: {0}">
                                                  <Binding Path="SubdivisionName" />
                                                  <Binding Path="SubdivisionID" />
                                                </MultiBinding>
                                            </TextBlock.Text>
                                        </TextBlock>
                                    </Grid>
                                </StackPanel>
                            </Expander.Header>
                            <StackPanel>
                                <Grid>
                                    <Grid.ColumnDefinitions>
                                        <ColumnDefinition Width="*"/>
                                        <ColumnDefinition/>
                                        <ColumnDefinition/>
                                    </Grid.ColumnDefinitions>
                                    <Grid.RowDefinitions>
                                        <RowDefinition />
                                        <RowDefinition />
                                    </Grid.RowDefinitions>
                                    <TextBlock Text="{Binding ElementName=SubdivisionID}" />
                                    <TextBlock Text="{Binding Path=SubdivisionID}" />
                                </Grid>
                            </StackPanel>
                        </Expander>
                    </Border>
                </StackPanel>
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>

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评论(3

也只是曾经 2024-10-31 11:26:41

我能够通过下面的 XAML 将 ListBox height 属性绑定到 LayoutRoot GridActualHeight 来实现所需的高度

<Grid x:Name="LayoutRoot" Background="LightGray">
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width=".24*"/>
        <ColumnDefinition Width=".73*"/>
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
        <RowDefinition Height=".9*"/>
        <RowDefinition Height=".1*"/>
    </Grid.RowDefinitions>
    <ListBox Name="Subdivisions" SelectedItem="{Binding SelectedSubdivisionViewModel}" ItemsSource="{Binding Path=Subdivisions}" Grid.IsSharedSizeScope="True" Height="{Binding ElementName=LayoutRoot, Path=ActualHeight}" >

:存在:

Height="{Binding ElementName=LayoutRoot, Path=ActualHeight}"

也可以通过祖先类型实现:

Height="{Binding Path=ActualHeight, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Grid}}}"

I was able to achieve the desired height by binding the ListBox height property to the ActualHeight of the LayoutRoot Grid via the XAML below:

<Grid x:Name="LayoutRoot" Background="LightGray">
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width=".24*"/>
        <ColumnDefinition Width=".73*"/>
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
        <RowDefinition Height=".9*"/>
        <RowDefinition Height=".1*"/>
    </Grid.RowDefinitions>
    <ListBox Name="Subdivisions" SelectedItem="{Binding SelectedSubdivisionViewModel}" ItemsSource="{Binding Path=Subdivisions}" Grid.IsSharedSizeScope="True" Height="{Binding ElementName=LayoutRoot, Path=ActualHeight}" >

The important bit being:

Height="{Binding ElementName=LayoutRoot, Path=ActualHeight}"

Also achievable via ancestor type:

Height="{Binding Path=ActualHeight, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Grid}}}"
固执像三岁 2024-10-31 11:26:41

堆栈面板使其压缩。去掉它,它就会填满整个高度

The stackpanels make it compress. Remove it and it'll fill the full height

开始看清了 2024-10-31 11:26:41

您发布的代码完全执行父网格的行高定义所声明的操作:占据可用高度的 90%。

*.1 = 高度的 10%
*.9 = 高度的 90%

通常,从 xaml 中消除混乱并从简单的内容开始有助于布局很有用。下面是一个示例,其中包含代码的网格列/行定义,但更简洁,并使用一些背景颜色来显示整个列表框。

  • 第一个列表框有几个项目,而第二个列表框只有几个项目。
  • 两个列表框都位于第一行,并填充了 90% 的可用空间。
  • 第二行包含一个网格,填充其余空间;您可以看到它占用了可用空间的 10%。

请注意,第一个列表框没有声明列或行索引;当不使用索引时,假定为0,即Grid.Row="0" Grid.Column=0

<Grid Background="Red">

    <Grid.ColumnDefinitions>
        <ColumnDefinition Width=".24*"/>
        <ColumnDefinition Width=".73*"/>
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
        <RowDefinition Height=".9*"/>
        <RowDefinition Height=".1*"/>
    </Grid.RowDefinitions>

    <ListBox Background="LightGray"
             ItemsSource="{x:Static Fonts.SystemFontFamilies}"/>

    <ListBox Grid.Column="1" Grid.Row="0" Background="LightSlateGray">
        <ListBoxItem>John</ListBoxItem>
        <ListBoxItem>Jane</ListBoxItem>
        <ListBoxItem>Fido</ListBoxItem>
    </ListBox>

    <Grid Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="2" Background="Tomato" />

</Grid>

The code you've posted does exactly what the parent grid's row height definition has declared: take up 90% of the available height.

*.1 = 10% of height
*.9 = 90% of the height

Often times its useful to remove the clutter from the xaml and start with something simple to help with the layout. Here's a sample with your code's Grid column/row definition's, but with less clutter and some background color to show the entire ListBox.

  • The first ListBox has several items, while the 2nd ListBox only has a few items.
  • Both ListBoxes are in the first row and fill 90% of the available space.
  • The 2nd Row contains a grid that fills the rest of the space; you can see that it takes up 10% of the available space.

Note that the first ListBox doesn't declare a Column or Row index; when no index is used, it is assumed to be 0, i.e., Grid.Row="0" Grid.Column=0.

<Grid Background="Red">

    <Grid.ColumnDefinitions>
        <ColumnDefinition Width=".24*"/>
        <ColumnDefinition Width=".73*"/>
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
        <RowDefinition Height=".9*"/>
        <RowDefinition Height=".1*"/>
    </Grid.RowDefinitions>

    <ListBox Background="LightGray"
             ItemsSource="{x:Static Fonts.SystemFontFamilies}"/>

    <ListBox Grid.Column="1" Grid.Row="0" Background="LightSlateGray">
        <ListBoxItem>John</ListBoxItem>
        <ListBoxItem>Jane</ListBoxItem>
        <ListBoxItem>Fido</ListBoxItem>
    </ListBox>

    <Grid Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="2" Background="Tomato" />

</Grid>
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