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Windows 8实用窍门系列:22.Windows 8 的SemanticZoom缩放视图

时间:2013-05-06 14:13来源:www.chengxuyuans.com 点击:

  在Windows 8中SemanticZoom缩放视图支持对GridView和ListView控件的视图效果进行缩放,它提供一个详细信息视图(ZoomedInView)以让用户查看详细信息,另外提供一个缩小索引视图(ZoomedOutView)让用户快速定位想要查看信息的大概范围。

  一.想要实现这种效果我们需要使用SemanticZoom控件和CollectionViewSource控件配合使用:

    SemanticZoom控件:

    <SemanticZoom.ZoomedOutView>       <!--此处填充缩小索引视图的GridView,一般情况下绑定Group.Title-->    </SemanticZoom.ZoomedOutView>    <SemanticZoom.ZoomedInView>        <!--此处填充平常普通的GridView,显示详细信息-->    </SemanticZoom.ZoomedInView>

    CollectionViewSource是一个和前台UI控件进行互动的集合源。

      Source:源数据绑定属性

      IsSourceGrouped:是否允许分组

      View:获取当前与 CollectionViewSource 的此实例关联的视图对象

       View.CollectionGroups:返回该视图关联的所有集合组。

  二.现在通过一个实例来看如何使用SemanticZoom实现缩放视图,本实例接前一篇文章实例。

    1.前台设置CollectionViewSource控件

        <Grid.Resources>            <CollectionViewSource x:Name="itemcollectSource" IsSourceGrouped="true" ItemsPath="ItemContent" />        </Grid.Resources>

    2.前台绘制ZoomedInView视图和ZoomedOutView视图GridView

        <SemanticZoom x:Name="semanticZoom" VerticalAlignment="Center">            <SemanticZoom.ZoomedOutView>                <GridView ScrollViewer.IsHorizontalScrollChainingEnabled="False" >                    <GridView.ItemTemplate>                        <DataTemplate>                            <!--注意此处绑定的是实体集的GroupTitle属性-->                            <TextBlock Text="{Binding Group.GroupTitle}" FontSize="24"/>                        </DataTemplate>                    </GridView.ItemTemplate>                    <GridView.ItemsPanel>                        <ItemsPanelTemplate>                            <WrapGrid ItemWidth="150" ItemHeight="75" MaximumRowsOrColumns="1" VerticalChildrenAlignment="Center" />                        </ItemsPanelTemplate>                    </GridView.ItemsPanel>                    <GridView.ItemContainerStyle>                        <Style TargetType="GridViewItem">                            <Setter Property="Margin" Value="4" />                            <Setter Property="Padding" Value="10" />                            <Setter Property="BorderBrush" Value="Gray" />                            <Setter Property="BorderThickness" Value="1" />                            <Setter Property="HorizontalContentAlignment" Value="Center" />                            <Setter Property="VerticalContentAlignment" Value="Center" />                        </Style>                    </GridView.ItemContainerStyle>                </GridView>            </SemanticZoom.ZoomedOutView>            <SemanticZoom.ZoomedInView>                <!--设置ScrollViewer.IsHorizontalScrollChainingEnabled="False"-->                <GridView Name="gv_Item" ItemsSource="{Binding Source={StaticResource itemcollectSource}}"                   SelectedItem="{Binding ItemContent, Mode=TwoWay}" ScrollViewer.IsHorizontalScrollChainingEnabled="False"                  Margin="20,140,40,20"  IsSwipeEnabled="True"  >                    <GridView.ItemTemplate>                        <DataTemplate>                            <Grid Width="250" Height="200" Background="#33CCCCCC">                                <Grid.ColumnDefinitions>                                    <ColumnDefinition Width="110"></ColumnDefinition>                                    <ColumnDefinition></ColumnDefinition>                                </Grid.ColumnDefinitions>                                <Image Grid.Column="0" Margin="5,0,0,0" Source="{Binding ImageUrl}" Stretch="None"></Image>                                <TextBlock Grid.Column="1" Margin="15,15,0,0" Foreground="Black" Text="{Binding txtTitle}"                                    FontWeight="Bold" FontSize="16" TextWrapping="Wrap"/>                                <TextBlock Grid.Column="1" Margin="15,40,0,0" Foreground="Black" Text="{Binding txtContent}"                                    FontWeight="Light" FontSize="14" TextWrapping="Wrap"/>                            </Grid>                        </DataTemplate>                    </GridView.ItemTemplate>                    <GridView.ItemsPanel>                        <ItemsPanelTemplate>                            <VariableSizedWrapGrid Orientation="Vertical" MaximumRowsOrColumns="3" />                        </ItemsPanelTemplate>                    </GridView.ItemsPanel>                    <GridView.GroupStyle>                        <GroupStyle>                            <GroupStyle.HeaderTemplate>                                <DataTemplate>                                    <Grid Margin="1,0,0,6">                                        <Button AutomationProperties.Name="组名称" Content="{Binding GroupTitle}"/>                                    </Grid>                                </DataTemplate>                            </GroupStyle.HeaderTemplate>                            <GroupStyle.Panel>                                <ItemsPanelTemplate>                                    <VariableSizedWrapGrid Orientation="Vertical" Margin="0,0,50,0"/>                                </ItemsPanelTemplate>                            </GroupStyle.Panel>                        </GroupStyle>                    </GridView.GroupStyle>                </GridView>            </SemanticZoom.ZoomedInView>        </SemanticZoom>

    3.设置后台数据源和关联ZoomedOutView视图数据

        public MainPage()        {            this.InitializeComponent();            this.itemcollectSource.Source = new ViewModelData().Sourcedata;            //此处需要将ZoomedOutView的视图数据结合关联ZoomedInView的集合组            (semanticZoom.ZoomedOutView as ListViewBase).ItemsSource = itemcollectSource.View.CollectionGroups;        }

  三.我们看效果图如下,如需源码请点击 win8Gridview3.rar 下载。

    ZoomedOutView效果图

    ZoomedInView效果图

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