重新想象 Windows 8 Store Apps (13) - 控件之 SemanticZoom
作者:webabcd
介绍
重新想象 Windows 8 Store Apps
之 SemanticZoom
- 演示 SemanticZoom 的应用
- 通过 ISemanticZoomInformation 接口实现自定义 SemanticZoom 的 View
示例
1、演示 SemanticZoom 的应用
Index.xaml
<Page x:Class="XamlDemo.Index" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="using:XamlDemo" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d"> <Grid Background="Transparent"> <SemanticZoom x:Name="semanticZoom" HorizontalAlignment="Left"> <!-- 放大后的视图,详细数据 --> <SemanticZoom.ZoomedInView> <GridView x:Name="gridViewDetails" SelectionMode="None" IsSwipeEnabled="false" Padding="120 0 0 0"> <!--分组后,details 的数据模板--> <GridView.ItemTemplate> <DataTemplate> <Grid Background="#022a56" Width="200" Height="65" Tapped="Grid_Tapped_1" Tag="{Binding}"> <TextBlock TextWrapping="Wrap" FontSize="14.667" Foreground="#ffffff" Padding="5 0" HorizontalAlignment="Left" VerticalAlignment="Center" Text="{Binding Title}"/> </Grid> </DataTemplate> </GridView.ItemTemplate> <!--分组的样式--> <GridView.GroupStyle> <GroupStyle> <!--分组后,header 的数据模板--> <GroupStyle.HeaderTemplate> <DataTemplate> <TextBlock Text="{Binding Title}" FontSize="26.67" Height="30" Margin="0 0 0 20" /> </DataTemplate> </GroupStyle.HeaderTemplate> <!--分组后,每组数据(包括 header 和 details)的样式--> <GroupStyle.ContainerStyle> <Style TargetType="GroupItem"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="GroupItem"> <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}"> <Grid> <Grid.RowDefinitions> <RowDefinition Height="Auto"/> <RowDefinition Height="*"/> </Grid.RowDefinitions> <ContentPresenter ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" Margin="{TemplateBinding Padding}"/> <!-- 每组数据的 details 数据源来自 ICollectionViewGroup.GroupItems --> <ItemsControl x:Name="ItemsControl" ItemsSource="{Binding GroupItems}" Grid.Row="1"/> </Grid> </Border> </ControlTemplate> </Setter.Value> </Setter> </Style> </GroupStyle.ContainerStyle> <!--分组后,每组数据(包括 header 和 details)的 panel--> <GroupStyle.Panel> <ItemsPanelTemplate> <VariableSizedWrapGrid Orientation="Vertical" Margin="0 0 50 0" ItemHeight="75" Loaded="VariableSizedWrapGrid_Loaded_1" /> </ItemsPanelTemplate> </GroupStyle.Panel> </GroupStyle> </GridView.GroupStyle> <!--整体数据(一组数据算一个元素)的 panel--> <GridView.ItemsPanel> <ItemsPanelTemplate> <StackPanel Orientation="Horizontal" /> </ItemsPanelTemplate> </GridView.ItemsPanel> </GridView> </SemanticZoom.ZoomedInView> <!-- 缩小后的视图,概述数据 --> <SemanticZoom.ZoomedOutView> <GridView Name="gridViewSummary" HorizontalAlignment="Left" Padding="120 0 0 0"> <GridView.ItemTemplate> <DataTemplate> <Grid Background="#022a56" Width="100" Height="100"> <!-- 每组数据的 header 数据源来自 ICollectionViewGroup.Group --> <TextBlock Text="{Binding Group.Title}" Foreground="#ffffff" Opacity="0.9" FontSize="14.667" Margin="5" TextAlignment="Center" HorizontalAlignment="Center" VerticalAlignment="Center" TextWrapping="Wrap" /> </Grid> </DataTemplate> </GridView.ItemTemplate> <GridView.ItemsPanel> <ItemsPanelTemplate> <WrapGrid MaximumRowsOrColumns="8" HorizontalAlignment="Center" VerticalAlignment="Center" Orientation="Horizontal" /> </ItemsPanelTemplate> </GridView.ItemsPanel> <GridView.ItemContainerStyle> <Style TargetType="GridViewItem"> <Setter Property="Margin" Value="5 5 5 30" /> <Setter Property="HorizontalContentAlignment" Value="Center" /> <Setter Property="VerticalContentAlignment" Value="Center" /> </Style> </GridView.ItemContainerStyle> </GridView> </SemanticZoom.ZoomedOutView> </SemanticZoom> </Grid> </Page>
Index.xaml.cs
/* * 本页为此 app 的导航页,同时用于演示: * 1、ItemsControl 控件如何分组 * 2、SemanticZoom 控件的应用 * * * SemanticZoom - 用于关联两个有语义关系的视图 * ZoomedInView - 放大后的视图,详细数据 * ZoomedOutView - 缩小后的视图,概述数据 * IsZoomedInViewActive - ZoomedInView 是否为当前正在显示的视图 * CanChangeViews - 是否可在两个视图间切换 * IsZoomOutButtonEnabled - 是否显示用于切换视图的按钮 * ToggleActiveView() - 切换视图 * ViewChangeStarted - 视图开始切换时触发的事件 * ViewChangeCompleted - 视图切换完成时触发的事件 * * * ItemsControl - 一个用于呈现集合数据的控件(GridView, ListView, FlipView, ListBox 等均直接或间接地继承了 ItemsControl) * ItemsControl 控件提供了分组功能 * * CollectionViewSource - 对集合数据启用分组支持 * Source - 数据源 * View - 获取视图对象,返回一个实现了 ICollectionView 接口的对象 * IsSourceGrouped - 数据源是否是一个被分组的数据 * ItemsPath - 数据源中,子数据集合的属性名称 * * ICollectionView - 支持数据分组 * CollectionGroups - 组数据集合 */ using System; using System.Collections.Generic; using System.Linq; using System.Xml.Linq; using Windows.UI.Core; using Windows.UI.Xaml; using Windows.UI.Xaml.Controls; using Windows.UI.Xaml.Data; using Windows.UI.Xaml.Input; using Windows.UI.Xaml.Navigation; using XamlDemo.Common; namespace XamlDemo { public sealed partial class Index : Page { // 本页所用到的 GridView 的水平方向上的滚动值 private double _scrollViewerHorizontalOffset = 0; public Index() { this.InitializeComponent(); XElement root = XElement.Load("SiteMap.xml"); var items = LoadData(root); // 构造数据源 CollectionViewSource groupedNavigationData = new CollectionViewSource(); groupedNavigationData.IsSourceGrouped = true; groupedNavigationData.Source = items; groupedNavigationData.ItemsPath = new PropertyPath("Items"); // 绑定数据 gridViewDetails.ItemsSource = groupedNavigationData.View; // 全部数据 gridViewSummary.ItemsSource = groupedNavigationData.View.CollectionGroups; // 关联的组数据集合 // 必须缓存此页 this.NavigationCacheMode = NavigationCacheMode.Required; gridViewDetails.Loaded += gridViewDetails_Loaded; } // 导航到其它页之前,保存本页所用到的 GridView 的水平方向上的滚动值 protected override void OnNavigatedFrom(NavigationEventArgs e) { var scrollViewer = Helper.GetVisualChild<ScrollViewer>(gridViewDetails); _scrollViewerHorizontalOffset = scrollViewer.HorizontalOffset; } // GridView 加载之后,指定其水平方向上的滚动值 void gridViewDetails_Loaded(object sender, RoutedEventArgs e) { var scrollViewer = Helper.GetVisualChild<ScrollViewer>(gridViewDetails); scrollViewer.ScrollToHorizontalOffset(_scrollViewerHorizontalOffset); } // 获取数据 private List<NavigationModel> LoadData(XElement root) { if (root == null) return null; var items = from n in root.Elements("node") select new NavigationModel { Title = (string)n.Attribute("title"), Url = (string)n.Attribute("url"), Items = LoadData(n) }; return items.ToList(); } // 导航到指定的 Demo 页 private void Grid_Tapped_1(object sender, TappedRoutedEventArgs e) { var model = (NavigationModel)(sender as Grid).Tag; MainPage.Current.SubTitle = model.Title; MainPage.Current.Container.Navigate(Type.GetType(model.Url)); } // 根据屏幕的 height 调整 VariableSizedWrapGrid 的 MaximumRowsOrColumns // 本例会自动 wrap ,所以不需要以下逻辑,在需要的场景下可以用之 private void VariableSizedWrapGrid_Loaded_1(object sender, RoutedEventArgs e) { /* var screenHeight = Window.Current.Bounds.Height; // CoreWindow.GetForCurrentThread().Bounds.Height var vswg = sender as VariableSizedWrapGrid; vswg.MaximumRowsOrColumns = (int)((screenHeight - 200) / 75); */ } class NavigationModel { public string Title { get; set; } public string Url { get; set; } public List<NavigationModel> Items { get; set; } } } }
2、演示如何自定义 SemanticZoom 视图
SemanticZoom/MyFlipView.cs
/* * 开发一个实现了 ISemanticZoomInformation 接口的自定义 FlipView */ using Windows.UI.Xaml.Controls; using Windows.UI.Xaml.Data; namespace XamlDemo.Controls.SemanticZoom { public class MyFlipView : FlipView, ISemanticZoomInformation { public MyFlipView() : base() { } public void CompleteViewChange() { } public void CompleteViewChangeFrom(SemanticZoomLocation source, SemanticZoomLocation destination) { } public void CompleteViewChangeTo(SemanticZoomLocation source, SemanticZoomLocation destination) { } public void InitializeViewChange() { } public bool IsActiveView { get; set; } public bool IsZoomedInView { get; set; } public Windows.UI.Xaml.Controls.SemanticZoom SemanticZoomOwner { get; set; } public void StartViewChangeFrom(SemanticZoomLocation source, SemanticZoomLocation destination) { } /// <summary> /// ZoomedOutView -> ZoomedInView 时触发的事件 /// </summary> /// <param name="source">在 ZoomedOutView 时被选中的数据</param> /// <param name="destination">需要传递给 ZoomedInView 的数据</param> public void StartViewChangeTo(SemanticZoomLocation source, SemanticZoomLocation destination) { /* * 注: * GridView 和 ListView 均实现了 ISemanticZoomInformation 接口 * 参见本 app 的关于 SemanticZoom 的 Demo,通过 CollectionViewSource 绑定数据即可使 SemanticZoom 中的两个视图进行有关联地切换 * 此时此处的 source.Item 便为一个 ICollectionViewGroup 类型的数据,其有两个属性:Group 和 GroupItems */ // 获取在 ZoomedOutView 中被选中的项,即被选中的父亲 NavigationModel model = source.Item as NavigationModel; // 将此父亲的所有子数据传递给 ZoomedInView,接下来会执行 MakeVisible() 方法 destination.Item = model.Items; } /// <summary> /// 开始 ZoomedOutView -> ZoomedInView 之后,会调用此方法 /// 一般在此处重整 ZoomedInView 的数据源,或者滚动 ZoomedInView 中的内容到指定的项以对应 ZoomedOutView 中被选中的数据 /// </summary> /// <param name="item">由 StartViewChangeTo() 方法传递给 ZoomedInView 的数据</param> public void MakeVisible(SemanticZoomLocation item) { // 将 FlipView 的数据源指定为被选中的父亲的所有子数据 this.ItemsSource = item.Item; } } }
SemanticZoom/CustomView.xaml
<Page x:Class="XamlDemo.Controls.SemanticZoom.CustomView" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="using:XamlDemo.Controls.SemanticZoom" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d"> <Grid Background="Transparent"> <SemanticZoom x:Name="semanticZoom" IsZoomedInViewActive="False" Margin="120 0 0 0"> <!-- 放大后的视图,详细数据 --> <SemanticZoom.ZoomedInView> <local:MyFlipView x:Name="flipView" Width="600" Height="300" HorizontalAlignment="Left"> <FlipView.ItemTemplate> <DataTemplate> <TextBlock Text="{Binding Title}" FontSize="26.667" /> </DataTemplate> </FlipView.ItemTemplate> <FlipView.ItemContainerStyle> <Style TargetType="FlipViewItem"> <Setter Property="Background" Value="Blue" /> </Style> </FlipView.ItemContainerStyle> </local:MyFlipView> </SemanticZoom.ZoomedInView> <!-- 缩小后的视图,概述数据 --> <SemanticZoom.ZoomedOutView> <GridView Name="gridView" HorizontalAlignment="Left"> <GridView.ItemTemplate> <DataTemplate> <Grid Background="#022a56" Width="100" Height="100"> <TextBlock Text="{Binding Title}" Foreground="#ffffff" Opacity="0.9" FontSize="14.667" Margin="5" TextAlignment="Center" HorizontalAlignment="Center" VerticalAlignment="Center" TextWrapping="Wrap" /> </Grid> </DataTemplate> </GridView.ItemTemplate> <GridView.ItemsPanel> <ItemsPanelTemplate> <WrapGrid MaximumRowsOrColumns="8" HorizontalAlignment="Center" VerticalAlignment="Center" Orientation="Horizontal" /> </ItemsPanelTemplate> </GridView.ItemsPanel> <GridView.ItemContainerStyle> <Style TargetType="GridViewItem"> <Setter Property="Margin" Value="5 5 5 30" /> <Setter Property="HorizontalContentAlignment" Value="Center" /> <Setter Property="VerticalContentAlignment" Value="Center" /> </Style> </GridView.ItemContainerStyle> </GridView> </SemanticZoom.ZoomedOutView> </SemanticZoom> </Grid> </Page>
SemanticZoom/CustomView.xaml.cs
/* * 演示如何自定义 SemanticZoom 视图 * 演示步骤: * 1、在 ZoomedOutView 视图中的 GridView 中选中某一项 * 2、展开 ZoomedInView 视图后,其内的 FlipView 显示之前被选中项的所有子数据(需要开发一个实现了 ISemanticZoomInformation 接口的自定义 FlipView,参见 MyFlipView.cs) * * 注: * GridView 和 ListView 均实现了 ISemanticZoomInformation 接口,所以可以在 SemanticZoom 的两个视图间有关联地切换 * 要让其它控件也实现类似的功能,就必须使其实现 ISemanticZoomInformation 接口 */ using System.Collections.Generic; using System.Linq; using System.Xml.Linq; using Windows.UI.Xaml.Controls; namespace XamlDemo.Controls.SemanticZoom { public sealed partial class CustomView : Page { public CustomView() { this.InitializeComponent(); XElement root = XElement.Load("SiteMap.xml"); var items = LoadData(root); // 绑定数据 gridView.ItemsSource = items; } // 获取数据 private List<NavigationModel> LoadData(XElement root) { if (root == null) return null; var items = from n in root.Elements("node") select new NavigationModel { Title = (string)n.Attribute("title"), Url = (string)n.Attribute("url"), Items = LoadData(n) }; return items.ToList(); } } public class NavigationModel { public string Title { get; set; } public string Url { get; set; } public List<NavigationModel> Items { get; set; } } }
OK
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