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重新想象 Windows 8 Store Apps (13) - 控件之 SemanticZoom

Posted on 2013-03-21 09:09 webabcd 阅读(...) 评论(...) 编辑 收藏

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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
[源码下载]