Question

我正在使用WPF和C＃。我有一个列表框滚动条的小问题。当有许多ListItem时，会显示垂直滚动条。它工作正常！但必要时永远不会显示水平滚动条。为什么它不起作用？请查看我的代码。我可能错过了一些东西。您可以复制我的所有代码并进行测试。希望能找到你的解决方案。谢谢！：）

WPF窗口：

       <Grid.Resources>
       <ResourceDictionary Source="/Menu\styles\test.xaml"></ResourceDictionary>
      </Grid.Resources>

    <ListBox HorizontalAlignment="Center" Width="196" Style="{DynamicResource ListBoxStyle1}" Margin="310,170,419,361">
        <ListBoxItem Content="fgfdgsdfgsdfgsdfgsdfg"/>
        <ListBoxItem Content="dfgsdfgsdfgsdfgsdfgsdfgsdfgsdfgsdfgsdfg"/>
        <ListBoxItem Content="Frafgsdfgsdfgsdfgdfgsdfgsdfgsdfgdfgdfgsnce"/>
        <ListBoxItem Content="Frafgsdfgsdfgsdfgdfgsdfgsdfgsdfgdfgdfgsnce"/>
        <ListBoxItem Content="Frafgsdfgsdfgsdfgdfgsdfgsdfgsdfgdfgdfgsnce"/>
        <ListBoxItem Content="Frafgsdfgsdfgsdfgdfgsdfgsdfgsdfgdfgdfgsnce"/>
        <ListBoxItem Content="Frafgsdfgsdfgsdfgdfgsdfgsdfgsdfgdfgdfgsnce"/>
        <ListBoxItem Content="Frafgsdfgsdfgsdfgdfgsdfgsdfgsdfgdfgdfgsnce"/>
    </ListBox>

样式：test.xaml

<SolidColorBrush x:Key="ListBorder" Color="#828790"/>
<!--LISTBOX-->
<Style x:Key="ListBoxStyle1" TargetType="{x:Type ListBox}">
    <Setter Property="BorderBrush" Value="#FF1C93F5"/>
    <Setter Property="BorderThickness" Value="5"/>
    <Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto"/>
    <Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/>
    <Setter Property="ScrollViewer.CanContentScroll" Value="true"/>
    <Setter Property="ScrollViewer.PanningMode" Value="Both"/>
    <Setter Property="Stylus.IsFlicksEnabled" Value="False"/>
    <Setter Property="VerticalContentAlignment" Value="Center"/>
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type ListBox}">
                <Grid>
                    <Rectangle Fill="#FF1F1E1E" RadiusX="10" RadiusY="1" Opacity="0.195" />
                    <Border CornerRadius="10" x:Name="Bd" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Padding="1" SnapsToDevicePixels="true">
                        <ScrollViewer Focusable="false" Padding="{TemplateBinding Padding}" Template="{DynamicResource ScrollViewerControlTemplate1}">
                            <ItemsPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
                        </ScrollViewer>
                    </Border>
                </Grid>
                <ControlTemplate.Triggers>
                    <Trigger Property="IsEnabled" Value="false">
                        <Setter Property="Background" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"/>
                    </Trigger>
                    <Trigger Property="IsGrouping" Value="true">
                        <Setter Property="ScrollViewer.CanContentScroll" Value="false"/>
                    </Trigger>
                </ControlTemplate.Triggers>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

<!--SCROLL VIEWER-->
<ControlTemplate x:Key="ScrollViewerControlTemplate1" TargetType="{x:Type ScrollViewer}">
    <Grid x:Name="Grid" Background="{TemplateBinding Background}">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*"/>
            <ColumnDefinition Width="Auto"/>
        </Grid.ColumnDefinitions>
        <ScrollContentPresenter x:Name="PART_ScrollContentPresenter" CanContentScroll="{TemplateBinding CanContentScroll}" CanHorizontallyScroll="False" CanVerticallyScroll="False" ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" Grid.Column="0" Margin="{TemplateBinding Padding}" />
       <!--vertical scrollbar-->
        <ScrollBar x:Name="PART_VerticalScrollBar" AutomationProperties.AutomationId="VerticalScrollBar" Cursor="Hand"  Grid.Column="1" Maximum="{TemplateBinding ScrollableHeight}" Minimum="0" Visibility="{TemplateBinding ComputedVerticalScrollBarVisibility}" Value="{Binding VerticalOffset, Mode=OneWay, RelativeSource={RelativeSource TemplatedParent}}" ViewportSize="{TemplateBinding ViewportHeight}" Style="{DynamicResource ScrollBarStyle1}"/>
    </Grid>
</ControlTemplate>

<!--LISTBOX ITEM-->
<Style TargetType="{x:Type ListBoxItem}">
    <Setter Property="Foreground" Value="White" />
    <Setter Property="Background" Value="Transparent"/>
    <Setter Property="HorizontalContentAlignment" Value="{Binding HorizontalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}"/>
    <Setter Property="VerticalContentAlignment" Value="{Binding VerticalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}"/>
    <Setter Property="Padding" Value="2,0,0,0"/>
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type ListBoxItem}">
                <Border x:Name="Bd" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Padding="{TemplateBinding Padding}" SnapsToDevicePixels="true">
                    <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                </Border>
                <ControlTemplate.Triggers>
                    <Trigger Property="IsSelected" Value="true">
                        <Setter Property="Background" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
                        <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.HighlightTextBrushKey}}"/>
                    </Trigger>
                    <MultiTrigger>
                        <MultiTrigger.Conditions>
                            <Condition Property="IsSelected" Value="true"/>
                            <Condition Property="Selector.IsSelectionActive" Value="false"/>
                        </MultiTrigger.Conditions>
                        <Setter Property="Background" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"/>
                        <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
                    </MultiTrigger>
                    <Trigger Property="IsEnabled" Value="false">
                        <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
                    </Trigger>
                </ControlTemplate.Triggers>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

<!--SCROLLBAR BUTTON-->
<Style x:Key="ScrollBarButton" TargetType="{x:Type RepeatButton}">
    <Setter Property="OverridesDefaultStyle" Value="true"/>
    <Setter Property="Focusable" Value="false"/>
    <Setter Property="IsTabStop" Value="false"/>
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type RepeatButton}">
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>


<!--SCROLL BAR THUMB-->
<Style x:Key="ScrollBarThumb" TargetType="{x:Type Thumb}">
    <Setter Property="OverridesDefaultStyle" Value="true"/>
    <Setter Property="IsTabStop" Value="false"/>
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type Thumb}">
                <Rectangle Width="8" Fill="White" RadiusX="5" RadiusY="5">
                    <Rectangle.Effect>
                        <DropShadowEffect ShadowDepth="0" BlurRadius="10" Color="White" />
                    </Rectangle.Effect>
                </Rectangle>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>



<!--VERTICAL SCROLLBAR BACKGROUND-->
<LinearGradientBrush x:Key="VerticalScrollBarBackground" EndPoint="1,0" StartPoint="0,0">
    <GradientStop Color="#E1E1E1" Offset="0"/>
    <GradientStop Color="#EDEDED" Offset="0.20"/>
    <GradientStop Color="#EDEDED" Offset="0.80"/>
    <GradientStop Color="#E3E3E3" Offset="1"/>
</LinearGradientBrush>
<SolidColorBrush x:Key="ScrollBarDisabledBackground" Color="#F4F4F4"/>

<!--VERTICAL SCROLLBAR PAGE BUTTON-->
<Style x:Key="VerticalScrollBarPageButton" TargetType="{x:Type RepeatButton}">
    <Setter Property="OverridesDefaultStyle" Value="true"/>
    <Setter Property="Background" Value="Transparent"/>
    <Setter Property="Focusable" Value="false"/>
    <Setter Property="IsTabStop" Value="false"/>
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type RepeatButton}">
                <Rectangle Fill="{TemplateBinding Background}" Height="{TemplateBinding Height}" Width="{TemplateBinding Width}"/>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

<!--HORIZONTAL SCROLLBAR BACKGROUND-->
<LinearGradientBrush x:Key="HorizontalScrollBarBackground" EndPoint="0,1" StartPoint="0,0">
    <GradientStop Color="#E1E1E1" Offset="0"/>
    <GradientStop Color="#EDEDED" Offset="0.20"/>
    <GradientStop Color="#EDEDED" Offset="0.80"/>
    <GradientStop Color="#E3E3E3" Offset="1"/>
</LinearGradientBrush>

<!--HORIZONTAL SCROLLBAR PAGE BUTTON-->
<Style x:Key="HorizontalScrollBarPageButton" TargetType="{x:Type RepeatButton}">
    <Setter Property="OverridesDefaultStyle" Value="true"/>
    <Setter Property="Background" Value="Transparent"/>
    <Setter Property="Focusable" Value="false"/>
    <Setter Property="IsTabStop" Value="false"/>
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type RepeatButton}">
                <Rectangle Fill="{TemplateBinding Background}" Height="{TemplateBinding Height}" Width="{TemplateBinding Width}"/>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

<!--SCROLLBAR STYLE-->
<Style x:Key="ScrollBarStyle1" TargetType="{x:Type ScrollBar}">
    <!--STYLE FOR VERTICAL-->
    <Setter Property="Background" Value="Transparent"/>
    <Setter Property="Stylus.IsPressAndHoldEnabled" Value="false"/>
    <Setter Property="Stylus.IsFlicksEnabled" Value="false"/>
    <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
    <Setter Property="Width" Value="{DynamicResource {x:Static SystemParameters.VerticalScrollBarWidthKey}}"/>
    <Setter Property="MinWidth" Value="{DynamicResource {x:Static SystemParameters.VerticalScrollBarWidthKey}}"/>


    <!--TEMPLATE FOR VERTICAL-->
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type ScrollBar}">
                <Grid x:Name="Bg" Background="{TemplateBinding Background}" SnapsToDevicePixels="true">
                    <Border Width="1" Background="#FFFFFF" HorizontalAlignment="Center"/>
                    <Track x:Name="PART_Track" IsDirectionReversed="true" IsEnabled="{TemplateBinding IsMouseOver}">

                        <Track.Thumb>
                            <Thumb Style="{StaticResource ScrollBarThumb}"/>
                        </Track.Thumb>
                    </Track>
                </Grid>
                <ControlTemplate.Triggers>
                    <Trigger Property="IsEnabled" Value="false">
                        <Setter Property="Background" TargetName="Bg" Value="{StaticResource ScrollBarDisabledBackground}"/>
                    </Trigger>
                </ControlTemplate.Triggers>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
    <Style.Triggers>

        <!--ORIENTATION = HORIZONTAL-->
        <Trigger Property="Orientation" Value="Horizontal">
            <Setter Property="Width" Value="Auto"/>
            <Setter Property="MinWidth" Value="0"/>
            <Setter Property="Height" Value="{DynamicResource {x:Static SystemParameters.HorizontalScrollBarHeightKey}}"/>
            <Setter Property="MinHeight" Value="{DynamicResource {x:Static SystemParameters.HorizontalScrollBarHeightKey}}"/>
            <Setter Property="Background" Value="{StaticResource HorizontalScrollBarBackground}"/>
            <Setter Property="Template">
                <Setter.Value>
                    <!--FOR HORIZONTAL-->
                    <ControlTemplate TargetType="{x:Type ScrollBar}">
                        <Grid x:Name="Bg" Background="{TemplateBinding Background}" SnapsToDevicePixels="true">
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition MaxWidth="{DynamicResource {x:Static SystemParameters.HorizontalScrollBarButtonWidthKey}}"/>
                                <ColumnDefinition Width="0.00001*"/>
                                <ColumnDefinition MaxWidth="{DynamicResource {x:Static SystemParameters.HorizontalScrollBarButtonWidthKey}}"/>
                            </Grid.ColumnDefinitions>
                            <RepeatButton Command="{x:Static ScrollBar.LineLeftCommand}" IsEnabled="{TemplateBinding IsMouseOver}" Style="{StaticResource ScrollBarButton}" />
                            <Track x:Name="PART_Track" Grid.Column="1" IsEnabled="{TemplateBinding IsMouseOver}">
                                <Track.DecreaseRepeatButton>
                                    <RepeatButton Command="{x:Static ScrollBar.PageLeftCommand}" Style="{StaticResource HorizontalScrollBarPageButton}"/>
                                </Track.DecreaseRepeatButton>
                                <Track.IncreaseRepeatButton>
                                    <RepeatButton Command="{x:Static ScrollBar.PageRightCommand}" Style="{StaticResource HorizontalScrollBarPageButton}"/>
                                </Track.IncreaseRepeatButton>
                                <Track.Thumb>
                                    <Thumb Style="{StaticResource ScrollBarThumb}"/>
                                </Track.Thumb>
                            </Track>
                            <RepeatButton Grid.Column="2" Command="{x:Static ScrollBar.LineRightCommand}" IsEnabled="{TemplateBinding IsMouseOver}" Style="{StaticResource ScrollBarButton}"/>
                        </Grid>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsEnabled" Value="false">
                                <Setter Property="Background" TargetName="Bg" Value="{StaticResource ScrollBarDisabledBackground}"/>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Trigger>
    </Style.Triggers>
</Style>

Answer 1

因为PART_HorizontalScrollBar <{1}} ControlTemplate中没有ScrollViewer

您的ScrollViewer ControlTemplate应如下所示：

<!--  SCROLL VIEWER  -->
<ControlTemplate x:Key="ScrollViewerControlTemplate1"
                  TargetType="{x:Type ScrollViewer}">
  <Grid x:Name="Grid"
        Background="{TemplateBinding Background}">
    <Grid.ColumnDefinitions>
      <ColumnDefinition Width="*" />
      <ColumnDefinition Width="Auto" />
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
      <RowDefinition Height="*" />
      <RowDefinition Height="Auto" />
    </Grid.RowDefinitions>
    <ScrollContentPresenter x:Name="PART_ScrollContentPresenter"
                            Grid.Column="0"
                            Margin="{TemplateBinding Padding}"
                            CanContentScroll="{TemplateBinding CanContentScroll}"
                            CanHorizontallyScroll="False"
                            CanVerticallyScroll="False"
                            Content="{TemplateBinding Content}"
                            ContentTemplate="{TemplateBinding ContentTemplate}" />
    <!--  vertical scrollbar  -->
    <ScrollBar x:Name="PART_VerticalScrollBar"
                Grid.Column="1"
                AutomationProperties.AutomationId="VerticalScrollBar"
                Cursor="Hand"
                Maximum="{TemplateBinding ScrollableHeight}"
                Minimum="0"
                Style="{DynamicResource ScrollBarStyle1}"
                ViewportSize="{TemplateBinding ViewportHeight}"
                Visibility="{TemplateBinding ComputedVerticalScrollBarVisibility}"
                Value="{Binding VerticalOffset,
                                Mode=OneWay,
                                RelativeSource={RelativeSource TemplatedParent}}" />
    <!-- NEW BIT -->
    <ScrollBar x:Name="PART_HorizontalScrollBar"
                Grid.Row="1"
                Grid.Column="0"
                AutomationProperties.AutomationId="HorizontalScrollBar"
                Cursor="Hand"
                Maximum="{TemplateBinding ScrollableWidth}"
                Minimum="0"
                Orientation="Horizontal"
                Style="{DynamicResource ScrollBarStyle1}"
                ViewportSize="{TemplateBinding ViewportWidth}"
                Visibility="{TemplateBinding ComputedHorizontalScrollBarVisibility}"
                Value="{Binding HorizontalOffset,
                                Mode=OneWay,
                                RelativeSource={RelativeSource TemplatedParent}}" />
  </Grid>
</ControlTemplate>

我还添加了Grid.RowDefinitions ^^以给水平ScrollBar一些空格。

注意：

有了这个，您的横向ScrollBar将会显示并具有响应性，但是它不会被Style应用，因为您目前只更新了垂直ScrollBar的模板ScrollBarStyle1。所以你也必须相应地更新横向的。

wpf：垂直滚动条工作正常但水平滚动条不起作用

1 个答案: