Question

我有一个TreeView，我试图将它限制在其父级的维度。我正在使用SL4 TextTrimming来修剪模板中显示的TextBlock但是我没有看到TreeView的宽度绑定到父级的宽度，因此包含长文本的TextBlocks会推出TreeView的宽度。

我已经尝试禁用水平滚动条，将Width绑定到父级，然后摆弄HorizontalAlignment以及HorizontalContentAlignment，但我没有运气。任何意见都非常感谢。

Answer 1

禁用水平滚动条不起作用的原因是因为在默认的TreeView样式中，scrollviwer的HorizontalScrollBarVisibility设置为Auto。你可以做的是创建自己的样式并使其成为父模板。

    <Style TargetType="sdk:TreeView">
        <Setter Property="Background" Value="#FFFFFFFF"/>
        <Setter Property="Foreground" Value="#FF000000"/>
        <Setter Property="HorizontalContentAlignment" Value="Left"/>
        <Setter Property="VerticalContentAlignment" Value="Top"/>
        <Setter Property="Cursor" Value="Arrow"/>
        <Setter Property="BorderThickness" Value="1"/>
        <Setter Property="Padding" Value="1"/>
        <Setter Property="BorderBrush" Value="#FF000000"/>
        <Setter Property="IsTabStop" Value="True"/>
        <Setter Property="TabNavigation" Value="Once"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="sdk:TreeView">
                    <Grid>
                        <VisualStateManager.VisualStateGroups>
                            <VisualStateGroup x:Name="CommonStates">
                                <VisualState x:Name="Normal"/>
                                <VisualState x:Name="MouseOver"/>
                                <VisualState x:Name="Pressed"/>
                                <VisualState x:Name="Disabled"/>
                            </VisualStateGroup>
                            <VisualStateGroup x:Name="FocusStates">
                                <VisualState x:Name="Unfocused"/>
                                <VisualState x:Name="Focused"/>
                            </VisualStateGroup>
                            <VisualStateGroup x:Name="ValidationStates">
                                <VisualState x:Name="Valid"/>
                                <VisualState x:Name="InvalidUnfocused">
                                    <Storyboard>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="Validation">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="Visible"/>
                                        </ObjectAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>
                                <VisualState x:Name="InvalidFocused">
                                    <Storyboard>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="Validation">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="Visible"/>
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="IsOpen" Storyboard.TargetName="ValidationToolTip">
                                            <DiscreteObjectKeyFrame KeyTime="0">
                                                <DiscreteObjectKeyFrame.Value>
                                                    <System:Boolean>True</System:Boolean>
                                                </DiscreteObjectKeyFrame.Value>
                                            </DiscreteObjectKeyFrame>
                                        </ObjectAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>
                            </VisualStateGroup>
                        </VisualStateManager.VisualStateGroups>
                        <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" CornerRadius="2">
                            <Border Background="{TemplateBinding Background}" Margin="1" Padding="{TemplateBinding Padding}">
                                <ScrollViewer x:Name="ScrollViewer" BorderBrush="Transparent" BorderThickness="0" Background="{x:Null}" HorizontalScrollBarVisibility="{TemplateBinding ScrollViewer.HorizontalScrollBarVisibility}" IsTabStop="False" TabNavigation="Once" VerticalScrollBarVisibility="Auto">
                                    <ItemsPresenter Margin="5"/>
                                </ScrollViewer>
                            </Border>
                        </Border>
                        <Border x:Name="Validation" BorderBrush="#FFDB000C" BorderThickness="{TemplateBinding BorderThickness}" Grid.Column="1" CornerRadius="2" Visibility="Collapsed">
                            <ToolTipService.ToolTip>
                                <ToolTip x:Name="ValidationToolTip" DataContext="{Binding RelativeSource={RelativeSource TemplatedParent}}" IsHitTestVisible="True" Placement="Right" PlacementTarget="{Binding RelativeSource={RelativeSource TemplatedParent}}" Template="{StaticResource CommonValidationToolTipTemplate}"/>
                            </ToolTipService.ToolTip>
                            <Grid Background="Transparent" HorizontalAlignment="Right" Height="10" Margin="0,-4,-4,0" VerticalAlignment="Top" Width="10">
                                <Path Data="M 1,0 L6,0 A 2,2 90 0 1 8,2 L8,7 Z" Fill="#FFDC000C" Margin="-1,3,0,0"/>
                                <Path Data="M 0,0 L2,0 L 8,6 L8,8" Fill="#FFFFFFFF" Margin="-1,3,0,0"/>
                            </Grid>
                        </Border>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

应用此样式后，您应该禁用水平滚动条树视图。然后，您需要设置文本块的最大宽度以允许省略号显示。

如果有帮助，请告诉我。：）

Silverlight TreeView禁用水平拉伸

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