使用 WrapPanel 和 ScrollViewer 包裹 ListBox 中的图像,所选项目消失!

发布于 2024-07-21 06:29:07 字数 8382 浏览 6 评论 0原文

我使用 ListBox 水平显示 800 个缩略图,但一次只能显示 6 个(取决于屏幕分辨率),我想使用列表两侧的按钮在图像中移动。

我目前正在使用此功能,但是当我将列表框的 SelectedItem 更改为下一个/上一个缩略图时,ScrollViewer 不会自动将 SelectedItem 保留在视图中。 6 个缩略图之后的 SelectedItem 将消失。

我可以移动 ScrollBar 来查看 SelectedItem,但这还不够好,在最终版本中我什至不需要 ScrollBar,我只是希望用户能够按住向左或向右按​​钮,并且它会快速通过相片。

另外只是为了告诉您为什么我想要这个,每次 ListBox 上的 SelectedItem 更改时,它都会更改上面照片的全尺寸预览。

无论如何,Silverlight 2 中是否可以确保 ScrollViewer(在 ListBox 中)中的 SelectedItem 保留在可视区域中?

以下是 ListBox 的当前 XAML:

    <ListBox x:Name="lbPhotos" 
         ItemsSource="{Binding Photos}" 
         SelectedItem="{Binding Path=SelectedPhoto, Mode=TwoWay}" 
         ItemContainerStyle="{StaticResource ReflectionListBoxItemStyle}">

    <ListBox.ItemsPanel>
        <ItemsPanelTemplate>
            <controls:WrapPanel Margin="0" />
        </ItemsPanelTemplate>
    </ListBox.ItemsPanel>

    <ListBox.Template>
        <ControlTemplate>
            <Grid>
                <ScrollViewer VerticalScrollBarVisibility="Hidden" HorizontalScrollBarVisibility="Hidden" 
                              BorderThickness="0" MaxHeight="170">
                    <ItemsPresenter />
                </ScrollViewer>
            </Grid>
        </ControlTemplate>
    </ListBox.Template>

    <ListBox.ItemTemplate>
        <DataTemplate>
            <Image MaxHeight="85" Source="{Binding ThumbnailUrl, Converter={StaticResource UrlToBitmapImageConverter}}" />
        </DataTemplate>
    </ListBox.ItemTemplate>

  </ListBox>

项目容器样式位于此处:

<Style x:Key="ReflectionListBoxItemStyle" TargetType="ListBoxItem">
        <Setter Property="Padding" Value="3"/>
        <Setter Property="HorizontalContentAlignment" Value="Left"/>
        <Setter Property="VerticalContentAlignment" Value="Top"/>
        <Setter Property="Background" Value="Transparent"/>
        <Setter Property="BorderThickness" Value="1"/>
        <Setter Property="TabNavigation" Value="Local"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="ListBoxItem">
                    <Grid Background="{TemplateBinding Background}">
                        <vsm:VisualStateManager.VisualStateGroups>
                            <vsm:VisualStateGroup x:Name="CommonStates">
                                <vsm:VisualState x:Name="Normal"/>
                                <vsm:VisualState x:Name="MouseOver">
                                    <Storyboard>
                                        <ColorAnimationUsingKeyFrames BeginTime="00:00:00" Duration="00:00:00.0010000" Storyboard.TargetName="MainContentBorder" Storyboard.TargetProperty="(Border.BorderBrush).(SolidColorBrush.Color)">
                                            <SplineColorKeyFrame KeyTime="00:00:00" Value="{StaticResource PinkColor}"/>
                                        </ColorAnimationUsingKeyFrames>
                                        <ColorAnimationUsingKeyFrames BeginTime="00:00:00" Duration="00:00:00.0010000" Storyboard.TargetName="ReflectionBorder" Storyboard.TargetProperty="(Border.BorderBrush).(SolidColorBrush.Color)">
                                            <SplineColorKeyFrame KeyTime="00:00:00" Value="{StaticResource PinkColor}"/>
                                        </ColorAnimationUsingKeyFrames>
                                    </Storyboard>
                                </vsm:VisualState>
                                <vsm:VisualState x:Name="Disabled">
                                </vsm:VisualState>
                            </vsm:VisualStateGroup>
                            <vsm:VisualStateGroup x:Name="SelectionStates">
                                <vsm:VisualState x:Name="Unselected"/>
                                <vsm:VisualState x:Name="Selected">
                                    <Storyboard>
                                        <ColorAnimationUsingKeyFrames BeginTime="00:00:00" Duration="00:00:00.0010000" Storyboard.TargetName="MainContentBorder" Storyboard.TargetProperty="(Border.BorderBrush).(SolidColorBrush.Color)">
                                            <SplineColorKeyFrame KeyTime="00:00:00" Value="{StaticResource PinkColor}"/>
                                        </ColorAnimationUsingKeyFrames>
                                        <ColorAnimationUsingKeyFrames BeginTime="00:00:00" Duration="00:00:00.0010000" Storyboard.TargetName="ReflectionBorder" Storyboard.TargetProperty="(Border.BorderBrush).(SolidColorBrush.Color)">
                                            <SplineColorKeyFrame KeyTime="00:00:00" Value="{StaticResource PinkColor}"/>
                                        </ColorAnimationUsingKeyFrames>
                                    </Storyboard>
                                </vsm:VisualState>
                            </vsm:VisualStateGroup>
                            <vsm:VisualStateGroup x:Name="FocusStates">
                                <vsm:VisualState x:Name="Focused">
                                </vsm:VisualState>
                                <vsm:VisualState x:Name="Unfocused"/>
                            </vsm:VisualStateGroup>
                        </vsm:VisualStateManager.VisualStateGroups>
                        <StackPanel Orientation="Vertical" Margin="0,0,4,0">
                        <!-- Image -->
                                <Border HorizontalAlignment="{TemplateBinding HorizontalAlignment}" BorderThickness="3,3,3,2" CornerRadius="1" x:Name="MainContentBorder" VerticalAlignment="{TemplateBinding VerticalAlignment}">
                                    <Border.BorderBrush>
                                        <SolidColorBrush Color="#00000000"/>
                                    </Border.BorderBrush>
                                    <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Content="{TemplateBinding Content}" ContentTemplate="{TemplateBinding ContentTemplate}"/>
                                </Border>

                                <!-- Image reflection -->
                                <Border RenderTransformOrigin="0.5,0.5" BorderThickness="3,2,3,3" CornerRadius="1" VerticalAlignment="{TemplateBinding VerticalAlignment}" Margin="0,2,0,0" x:Name="ReflectionBorder" HorizontalAlignment="{TemplateBinding HorizontalAlignment}">
                                    <Border.BorderBrush>
                                        <SolidColorBrush Color="#00000000"/>
                                    </Border.BorderBrush>
                                    <Border.OpacityMask>
                                        <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                                            <GradientStop Color="#66000000" Offset="1"/>
                                            <GradientStop Color="#00000000" Offset="0.348"/>
                                        </LinearGradientBrush>
                                    </Border.OpacityMask>
                                    <Border.RenderTransform>
                                        <TransformGroup>
                                            <ScaleTransform ScaleY="-1"/>
                                        </TransformGroup>
                                    </Border.RenderTransform>
                                    <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Content="{TemplateBinding Content}" ContentTemplate="{TemplateBinding ContentTemplate}"/>
                            </Border>
                            </StackPanel>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

I'm using a ListBox to display a horizontal display of 800 thumbnails, but only 6 at a time (depending on screen resolution), I want to move through the images using buttons either side of the list.

I currently have this working, but when I change the SelectedItem of the listbox to next/previous thumbnail the ScrollViewer doesn't automatically keep the SelectedItem in view. The SelectedItem after 6 thumbnails will just disappear.

I can move the ScrollBar to see the SelectedItem, but thats not good enough, in the final version I don't even want a ScrollBar, I just want the users to be able to hold down the Left or Right buttons and it blitses through the photos.

Also just to give you why I want this, every time the SelectedItem is changed on the ListBox it changes the FullSize preview of the photo above.

Is there anyway in Silverlight 2 to make sure the SelectedItem in the ScrollViewer (in the ListBox), stays in the viewable area?

Here's the current XAML for the ListBox:

    <ListBox x:Name="lbPhotos" 
         ItemsSource="{Binding Photos}" 
         SelectedItem="{Binding Path=SelectedPhoto, Mode=TwoWay}" 
         ItemContainerStyle="{StaticResource ReflectionListBoxItemStyle}">

    <ListBox.ItemsPanel>
        <ItemsPanelTemplate>
            <controls:WrapPanel Margin="0" />
        </ItemsPanelTemplate>
    </ListBox.ItemsPanel>

    <ListBox.Template>
        <ControlTemplate>
            <Grid>
                <ScrollViewer VerticalScrollBarVisibility="Hidden" HorizontalScrollBarVisibility="Hidden" 
                              BorderThickness="0" MaxHeight="170">
                    <ItemsPresenter />
                </ScrollViewer>
            </Grid>
        </ControlTemplate>
    </ListBox.Template>

    <ListBox.ItemTemplate>
        <DataTemplate>
            <Image MaxHeight="85" Source="{Binding ThumbnailUrl, Converter={StaticResource UrlToBitmapImageConverter}}" />
        </DataTemplate>
    </ListBox.ItemTemplate>

  </ListBox>

Item container style is here:

<Style x:Key="ReflectionListBoxItemStyle" TargetType="ListBoxItem">
        <Setter Property="Padding" Value="3"/>
        <Setter Property="HorizontalContentAlignment" Value="Left"/>
        <Setter Property="VerticalContentAlignment" Value="Top"/>
        <Setter Property="Background" Value="Transparent"/>
        <Setter Property="BorderThickness" Value="1"/>
        <Setter Property="TabNavigation" Value="Local"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="ListBoxItem">
                    <Grid Background="{TemplateBinding Background}">
                        <vsm:VisualStateManager.VisualStateGroups>
                            <vsm:VisualStateGroup x:Name="CommonStates">
                                <vsm:VisualState x:Name="Normal"/>
                                <vsm:VisualState x:Name="MouseOver">
                                    <Storyboard>
                                        <ColorAnimationUsingKeyFrames BeginTime="00:00:00" Duration="00:00:00.0010000" Storyboard.TargetName="MainContentBorder" Storyboard.TargetProperty="(Border.BorderBrush).(SolidColorBrush.Color)">
                                            <SplineColorKeyFrame KeyTime="00:00:00" Value="{StaticResource PinkColor}"/>
                                        </ColorAnimationUsingKeyFrames>
                                        <ColorAnimationUsingKeyFrames BeginTime="00:00:00" Duration="00:00:00.0010000" Storyboard.TargetName="ReflectionBorder" Storyboard.TargetProperty="(Border.BorderBrush).(SolidColorBrush.Color)">
                                            <SplineColorKeyFrame KeyTime="00:00:00" Value="{StaticResource PinkColor}"/>
                                        </ColorAnimationUsingKeyFrames>
                                    </Storyboard>
                                </vsm:VisualState>
                                <vsm:VisualState x:Name="Disabled">
                                </vsm:VisualState>
                            </vsm:VisualStateGroup>
                            <vsm:VisualStateGroup x:Name="SelectionStates">
                                <vsm:VisualState x:Name="Unselected"/>
                                <vsm:VisualState x:Name="Selected">
                                    <Storyboard>
                                        <ColorAnimationUsingKeyFrames BeginTime="00:00:00" Duration="00:00:00.0010000" Storyboard.TargetName="MainContentBorder" Storyboard.TargetProperty="(Border.BorderBrush).(SolidColorBrush.Color)">
                                            <SplineColorKeyFrame KeyTime="00:00:00" Value="{StaticResource PinkColor}"/>
                                        </ColorAnimationUsingKeyFrames>
                                        <ColorAnimationUsingKeyFrames BeginTime="00:00:00" Duration="00:00:00.0010000" Storyboard.TargetName="ReflectionBorder" Storyboard.TargetProperty="(Border.BorderBrush).(SolidColorBrush.Color)">
                                            <SplineColorKeyFrame KeyTime="00:00:00" Value="{StaticResource PinkColor}"/>
                                        </ColorAnimationUsingKeyFrames>
                                    </Storyboard>
                                </vsm:VisualState>
                            </vsm:VisualStateGroup>
                            <vsm:VisualStateGroup x:Name="FocusStates">
                                <vsm:VisualState x:Name="Focused">
                                </vsm:VisualState>
                                <vsm:VisualState x:Name="Unfocused"/>
                            </vsm:VisualStateGroup>
                        </vsm:VisualStateManager.VisualStateGroups>
                        <StackPanel Orientation="Vertical" Margin="0,0,4,0">
                        <!-- Image -->
                                <Border HorizontalAlignment="{TemplateBinding HorizontalAlignment}" BorderThickness="3,3,3,2" CornerRadius="1" x:Name="MainContentBorder" VerticalAlignment="{TemplateBinding VerticalAlignment}">
                                    <Border.BorderBrush>
                                        <SolidColorBrush Color="#00000000"/>
                                    </Border.BorderBrush>
                                    <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Content="{TemplateBinding Content}" ContentTemplate="{TemplateBinding ContentTemplate}"/>
                                </Border>

                                <!-- Image reflection -->
                                <Border RenderTransformOrigin="0.5,0.5" BorderThickness="3,2,3,3" CornerRadius="1" VerticalAlignment="{TemplateBinding VerticalAlignment}" Margin="0,2,0,0" x:Name="ReflectionBorder" HorizontalAlignment="{TemplateBinding HorizontalAlignment}">
                                    <Border.BorderBrush>
                                        <SolidColorBrush Color="#00000000"/>
                                    </Border.BorderBrush>
                                    <Border.OpacityMask>
                                        <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                                            <GradientStop Color="#66000000" Offset="1"/>
                                            <GradientStop Color="#00000000" Offset="0.348"/>
                                        </LinearGradientBrush>
                                    </Border.OpacityMask>
                                    <Border.RenderTransform>
                                        <TransformGroup>
                                            <ScaleTransform ScaleY="-1"/>
                                        </TransformGroup>
                                    </Border.RenderTransform>
                                    <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Content="{TemplateBinding Content}" ContentTemplate="{TemplateBinding ContentTemplate}"/>
                            </Border>
                            </StackPanel>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

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评论(2

奶茶白久 2024-07-28 06:29:07

您可以使用 ScrollIntoView 方法传入所选项目。

MSDN 文档

You could use the ScrollIntoView method passing in the selected item.

MSDN Docs

染火枫林 2024-07-28 06:29:07

我最终使用 ScrollViewer.ScrollToHorizo​​ntalOffset 因为 ScrollIntoView 不起作用

I ended up using ScrollViewer.ScrollToHorizontalOffset as ScrollIntoView didn't work

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