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展开器内容的滚动和拉伸

wpfscrollscrollviewerexpanderstretch
8
这是我想要的：
1.) 当我点击我的“Expander”按钮并展开时，它应该延伸到网格的末尾。
请参见示例图片 => alt text 2.) 当我写的文本超出“Expander”中“RichTextBox”可用的空间时，必须显示滚动条，并且我应该能够向下滚动。
将滚动条放置在“Expander”内容周围不难，但即使设置为“自动”，它们也不会出现。将滚动条设置为“可见”，我无法滚动，因为“Expander”的内容无限下降。
以下是我的示例代码：
<Grid Margin="30,0,0,0">
        <Grid.RowDefinitions>
            <RowDefinition Height="30" />
            <RowDefinition Height="*" />
            <RowDefinition Height="30" />
        </Grid.RowDefinitions>
        <StackPanel Background="LightCoral" Orientation="Horizontal">

            <TextBlock Grid.Column="0" Text="Incident type:" VerticalAlignment="Center" />
            <ComboBox  Grid.Column="1"  IsEditable="True" Margin="0,7" Text="{Binding SelectedIncidentReport.IncidentType,Mode=TwoWay}" />

            <TextBlock Grid.Column="0" Grid.Row="1" Text="Teachers name:" VerticalAlignment="Center" />
            <TextBox Grid.Column="1" Grid.Row="1" Height="25" Text="{Binding SelectedIncidentReport.TeacherName,Mode=TwoWay}" />

            <TextBlock Grid.Column="0" Grid.Row="2" Text="Tutor group:" VerticalAlignment="Center" />
            <TextBox Grid.Column="1" Grid.Row="2" Margin="0,7" Text="{Binding SelectedIncidentReport.TutorGroup,Mode=TwoWay}" />
        </StackPanel>

        <Grid Background="LightBlue" Grid.Row="1" >
            <Grid.RowDefinitions>
                <RowDefinition Height="Auto" />
                <RowDefinition Height="Auto" />
                <RowDefinition Height="Auto" />
                <RowDefinition Height="Auto" />
            </Grid.RowDefinitions>            
                <Expander Background="Purple" Grid.Row="0" Height="Auto" Header="Report details" IsExpanded="{Binding SelectedExpander, Mode=TwoWay, Converter={StaticResource ExpanderToBooleanConverter}, ConverterParameter=1}">
                   <Controls:RichTextBox                       
                            VerticalScrollBarVisibility="Auto"                                         
                            Text="{Binding SelectedIncidentReport.ReportDetails,UpdateSourceTrigger=LostFocus,IsAsync=True}"
                            AcceptsReturn="True" 
                            AutoWordSelection="True"
                            AllowDrop="False"
                            SelectionBrush="#FFAC5BCB"
                            HorizontalScrollBarVisibility="Auto" />               
            </Expander>  

        <Expander Background="Red" Grid.Row="1" Header="Action taken" IsExpanded="{Binding SelectedExpander, Mode=TwoWay, Converter={StaticResource ExpanderToBooleanConverter}, ConverterParameter=2}">
                <Controls:RichTextBox                                  
                            VerticalScrollBarVisibility="Auto"                                         
                            Text="{Binding SelectedIncidentReport.ActionTaken,UpdateSourceTrigger=LostFocus,IsAsync=True}"
                            AcceptsReturn="True" 
                            AutoWordSelection="True"
                            AllowDrop="False"
                            SelectionBrush="#FFAC5BCB"
                            HorizontalScrollBarVisibility="Auto" />
            </Expander>
            <Expander Background="Lavender" Grid.Row="2" Header="Further action" IsExpanded="{Binding SelectedExpander, Mode=TwoWay, Converter={StaticResource ExpanderToBooleanConverter}, ConverterParameter=3}" >
                <Controls:RichTextBox           
                            VerticalScrollBarVisibility="Auto"                                                         
                            Text="{Binding SelectedIncidentReport.FurtherAction,UpdateSourceTrigger=LostFocus,IsAsync=True}"
                            AcceptsReturn="True" 
                            AutoWordSelection="True"
                            AllowDrop="False"
                            SelectionBrush="#FFAC5BCB"
                            HorizontalScrollBarVisibility="Auto" />
            </Expander>
            <Expander Background="YellowGreen" Grid.Row="3" Header="Home contact" IsExpanded="{Binding SelectedExpander, Mode=TwoWay, Converter={StaticResource ExpanderToBooleanConverter}, ConverterParameter=4}" >

                <Controls:RichTextBox                        
                            VerticalScrollBarVisibility="Auto"                                                         
                            Text="{Binding SelectedIncidentReport.HomeContact,UpdateSourceTrigger=LostFocus,IsAsync=True}"
                            AcceptsReturn="True" 
                            AutoWordSelection="True"
                            AllowDrop="False"
                            SelectionBrush="#FFAC5BCB"
                            HorizontalScrollBarVisibility="Auto" />

            </Expander>
        </Grid>
        <Grid Background="LawnGreen" Grid.Row="2" >
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="100" />
                <ColumnDefinition Width="*" />
            </Grid.ColumnDefinitions>
            <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" Text="Documents:" Grid.Column="0" />
            <View:DocumentComboView  DataContext="{Binding Path=SelectedIncidentReport.Documents}" Grid.Column="1" HorizontalAlignment="Stretch"  />
        </Grid>

    </Grid>
2个回答
8

我认为你要找的是一种自动和*大小行的混合方式：在折叠时使用自动大小，展开时使用*大小。有很多方法可以实现这种切换。一个简单的方法是通过转换器将行高绑定到展开器上。XAML如下所示：

<Grid Background="LightBlue" Grid.Row="1" >
    <Grid.RowDefinitions>
        <RowDefinition Height="{Binding ElementName=Ex1, Path=IsExpanded, Converter={StaticResource ExpandedToGridLengthConverter}}" />
        <RowDefinition Height="{Binding ElementName=Ex2, Path=IsExpanded, Converter={StaticResource ExpandedToGridLengthConverter}}" />
        <RowDefinition Height="{Binding ElementName=Ex3, Path=IsExpanded, Converter={StaticResource ExpandedToGridLengthConverter}}" />
        <RowDefinition Height="{Binding ElementName=Ex4, Path=IsExpanded, Converter={StaticResource ExpandedToGridLengthConverter}}" />
    </Grid.RowDefinitions>
    <Expander Grid.Row="0" x:Name="Ex1" ...>
        <RichTextBox ... />
    </Expander>

    <Expander Grid.Row="1" x:Name="Ex2" ...>
        ...
    </Expander>
    ...
</Grid>

这里是一个简单版的转换器：

public class ExpandedToGridLengthConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        if (!(value is bool))
            return GridLength.Auto;

        if ((bool)value)
            return new GridLength(1, GridUnitType.Star);

        return GridLength.Auto;
    }

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

现在可用的空间将分配给打开的扩展器，折叠的扩展器只占用其标题所需的空间。如果文本对于其中一个已展开项来说太长，则 ScrollViewer 应该接管并开始滚动 * 区域内的文本。
它部分地工作。有两个缺陷：我对所有4个扩展器都得到了这个错误 => System.Windows.Data Error: 4 : 找不到引用'ElementName=Ex1'的绑定源。BindingExpression:Path=IsExpanded; DataItem=null; target element is 'RowDefinition' (HashCode=61280566); target property is 'Height' (type 'GridLength')，我在Expander.Content内的RichTextBox上尝试了这个 => Height OR MinHeight="{Binding ElementName=Ex1,Path=Height}"但是RichTextBox的高度没有向下拉伸？当我在RTB中写入大量文本时，文本会写出richTextBox... - Elisabeth
在Expander内部：<Controls：RichTextBox Height =“{Binding ElementName = Ex1，Path = ActualHeight}”/> 现在我始终需要减去Expander.Header的空间（高度），这也应该在转换器中发生。现在我需要转换器内的2个值：Expander.Header和Expander.Content的ActualHeight，以便将其减去并将其作为RichTextBox的新高度返回。但是如何将2个值传递给转换器？ - Elisabeth
我在谷歌上搜索了TextBox和RichTextBox的拉伸等问题...看起来存在一些问题，我必须解决它们！我可以将RichTextBox放入一个具有1列/行和高度为“*”的网格中，并将RichTExtBox设置为VErticalAlignment=Stretch，这应该可以解决问题，但实际上并没有！你有什么想法吗？可能出了什么问题？ - Elisabeth
我在Blend Expression中检查了Expander的ControlTemplate，它针对.NET 4.0应用程序有一个不同的ControlTemplate，而在MSDN上则是一个ControlTemplate，这很奇怪。使用Blend中的模板，我可以将RichTextbox放置在Expander的Content区域，并且它可以水平拉伸...好吧，看起来我需要更改一些转换器和网格设置，然后才能使其正常工作。 - Elisabeth
好的，看起来我应该检查一下这个链接：http://joshsmithonwpf.wordpress.com/2008/07/22/enable-elementname-bindings-with-elementspy/ - Elisabeth
显示剩余4条评论
3
我最近也需要做类似的事情。我使用了与你所写的非常相似的代码，但是通过页面背后的代码实现了所需的结果。尝试像这样做:
WPF
<Grid Grid.Row="1"
        Name="pageGrid" Margin="0,10,0,0">
        <Grid.RowDefinitions>
            <RowDefinition
                MinHeight="25"
                Height="*" />
            <RowDefinition
                MinHeight="25"
                Height="*" />
            <RowDefinition
                MinHeight="25"
                Height="*" />
            <RowDefinition
                MinHeight="25"
                Height="*" />
            <RowDefinition
                MinHeight="25"
                Height="*" />
            <RowDefinition
                MinHeight="25"
                Height="*" />
            <RowDefinition
                MinHeight="25"
                Height="*" />
        </Grid.RowDefinitions>
        <Expander
            Grid.Row="0"
            Header="header1"
            Name="expander1"
            Margin="0,0,0,0"
            VerticalAlignment="Top"
            FontSize="18"
            IsExpanded="True">
            <Grid>
                <TextBlock
                    Background="#336699FF"
                    Padding="5"
                    TextWrapping="Wrap"
                    Margin="30,5,10,5">                    
                test
                </TextBlock>
            </Grid>
        </Expander>
        <Expander
            Grid.Row="1"
            Header="header2"
            Margin="0,0,0,0"
            Name="expander2"
            VerticalAlignment="Top"
            FontSize="18">
            <Grid>
                <TextBlock
                    Background="#336699FF"
                    Padding="5"
                    TextWrapping="Wrap"
                    Margin="30,5,10,5">
                        test
                </TextBlock>
            </Grid>
        </Expander>
        <Expander
            Grid.Row="2"
            Header="header3"
            Margin="0,0,0,0"
            Name="expander3"
            VerticalAlignment="Top"
            FontSize="18">
            <Grid>
                <TextBlock
                    Background="#336699FF"
                    Padding="5"
                    TextWrapping="Wrap"
                    Margin="30,5,10,5">
                        test
                </TextBlock>
            </Grid>
        </Expander>
        <Expander
            Grid.Row="3"
            Header="header4"
            Margin="0,0,0,0"
            Name="expander4"
            VerticalAlignment="Top"
            FontSize="18">
            <Grid>
                <TextBlock
                    Background="#336699FF"
                    Padding="5"
                    TextWrapping="Wrap"
                    Margin="30,5,10,5">
                    test
                </TextBlock>
            </Grid>
        </Expander>
        <Expander
            Grid.Row="4"
            Header="header5"
            Margin="0,0,0,0"
            Name="expander5"
            VerticalAlignment="Top"
            FontSize="18">
            <Grid>
                <TextBlock
                    Background="#336699FF"
                    Padding="5"
                    TextWrapping="Wrap"
                    Margin="30,5,10,5">
                    test
                </TextBlock>
            </Grid>
        </Expander>
        <Expander
            Grid.Row="5"
            Header="header6"
            Margin="0,0,0,0"
            Name="expander6"
            VerticalAlignment="Top"
            FontSize="18">
            <Grid>
                <TextBlock
                    Background="#336699FF"
                    Padding="5"
                    TextWrapping="Wrap"
                    Margin="30,5,10,5">
                    test
                </TextBlock>
            </Grid>
        </Expander>
        <Expander
            Grid.Row="6"
            Header="header7"
            Margin="0,0,0,0"
            Name="expander7"
            VerticalAlignment="Top"
            FontSize="18">
            <Grid>
                <TextBlock Background="#336699FF" Padding="5"
                    TextWrapping="Wrap"
                    Margin="30,5,10,5">
                    text
                </TextBlock>
            </Grid>
        </Expander>
    </Grid>

在窗口的代码背后，我使用了C#语言，并且有以下代码:

C#

/// <summary>
/// Interaction logic for _07Slide.xaml
/// </summary>
public partial class _07Slide : Page
{
    GridLength[] starHeight;

    public _07Slide()
    {
        InitializeComponent();

        starHeight = new GridLength[pageGrid.RowDefinitions.Count];
        starHeight[0] = pageGrid.RowDefinitions[0].Height;
        starHeight[1] = pageGrid.RowDefinitions[2].Height;
        starHeight[2] = pageGrid.RowDefinitions[2].Height;
        starHeight[3] = pageGrid.RowDefinitions[2].Height;
        starHeight[4] = pageGrid.RowDefinitions[2].Height;
        starHeight[5] = pageGrid.RowDefinitions[2].Height;
        starHeight[6] = pageGrid.RowDefinitions[2].Height;
        ExpandedOrCollapsed(expander1);
        ExpandedOrCollapsed(expander2);
        ExpandedOrCollapsed(expander3);
        ExpandedOrCollapsed(expander4);
        ExpandedOrCollapsed(expander5);
        ExpandedOrCollapsed(expander6);
        ExpandedOrCollapsed(expander7);


        expander1.Expanded += ExpandedOrCollapsed;
        expander1.Collapsed += ExpandedOrCollapsed;
        expander2.Expanded += ExpandedOrCollapsed;
        expander2.Collapsed += ExpandedOrCollapsed;
        expander3.Expanded += ExpandedOrCollapsed;
        expander3.Collapsed += ExpandedOrCollapsed;
        expander4.Expanded += ExpandedOrCollapsed;
        expander4.Collapsed += ExpandedOrCollapsed;
        expander5.Expanded += ExpandedOrCollapsed;
        expander5.Collapsed += ExpandedOrCollapsed;
        expander6.Expanded += ExpandedOrCollapsed;
        expander6.Collapsed += ExpandedOrCollapsed;
        expander7.Expanded += ExpandedOrCollapsed;
        expander7.Collapsed += ExpandedOrCollapsed;

    }

    void ExpandedOrCollapsed(object sender, RoutedEventArgs e)
    {
        ExpandedOrCollapsed(sender as Expander);
    }

    void ExpandedOrCollapsed(Expander expander)
    {
        var rowIndex = Grid.GetRow(expander);
        var row = pageGrid.RowDefinitions[rowIndex];
        if (expander.IsExpanded)
        {
            row.Height = starHeight[rowIndex];
            row.MinHeight = 25;                
        }
        else
        {
            starHeight[rowIndex] = row.Height;
            row.Height = GridLength.Auto;
            row.MinHeight = 0;
        }
    }
}

在这个示例中，所有的扩展器都会自动增长以完全填充网格。如果您想要的话，可以修改它，使得在选择一个扩展器时折叠其他的扩展器。
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