滚动和拉伸扩展器的内容

Question

这就是我要的:

1.)当我单击我的Expander按钮并展开它时,它应该延伸到Grid的末尾

见样本图像=>

2.)当我在Expander ScrollBars中的RichTextBox中写入更多文本而不是空格时,必须可见,我应该能够向下滚动.

将滚动查看器放在Expander内容周围并不难,但即使设置"自动"它们也永远不会出现也无济于事.将滚动查看器设置为"可见"我无法滚动,因为扩展器的内容无休止地下降.

这是我的示例代码:

<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>

Answer 1

我认为你正在寻找的是自动和*大小的行的混合:折叠时自动,*展开时*.有很多方法可以实现这种转换.一个简单的方法是通过转换器将行高度绑定到扩展器.XAML看起来像这样:

<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>

这是转换器的简单版本:

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,可用空间将在打开的扩展器之间分开,而折叠的扩展器将只占用它们的头部需求.如果文本对于其中一个扩展的文本太长,ScrollViewer应该接管并开始滚动该区域内的文本.