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 程式師世界 >> 編程語言 >> .NET網頁編程 >> 關於.NET >> Windows 8 Store Apps學習(13) SemanticZoom控件

Windows 8 Store Apps學習(13) SemanticZoom控件

編輯:關於.NET

介紹

重新想象 Windows 8 Store Apps 之 SemanticZoom

演示 SemanticZoom 的應用

通過 ISemanticZoomInformation 接口實現自定義 SemanticZoom 的 View

示例

1、演示 SemanticZoom 的應用

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">
            <!--
                放大後的視圖,詳細數據
            -->
            <SemanticZoom.ZoomedInView>
                <GridView x:Name="gridViewDetails" SelectionMode="None" IsSwipeEnabled="false" Padding="120 0 0 0">
    
                    <!--分組後,details 的數據模板-->
                    <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>
                    <!--分組的樣式-->
                    <GridView.GroupStyle>
                        <GroupStyle>
                            <!--分組後,header 的數據模板-->
                            <GroupStyle.HeaderTemplate>
                                <DataTemplate>
                                    <TextBlock Text="{Binding Title}" FontSize="26.67" Height="30" Margin="0 0 0 20" />
                                </DataTemplate>
                            </GroupStyle.HeaderTemplate>
                            <!--分組後,每組數據(包括 header 和 details)的樣式-->
                            <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}"/>
                                                        <!--
                                                            每組數據的 details 數據源來自 ICollectionViewGroup.GroupItems
                                                        -->
                                                        <ItemsControl x:Name="ItemsControl" ItemsSource="{Binding GroupItems}" Grid.Row="1"/>
                                                    </Grid>
                                                </Border>
                                            </ControlTemplate>
                                        </Setter.Value>
                                    </Setter>
                                </Style>
                            </GroupStyle.ContainerStyle>
                            <!--分組後,每組數據(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>
                    <!--整體數據(一組數據算一個元素)的 panel-->
                    <GridView.ItemsPanel>
                        <ItemsPanelTemplate>
                            <StackPanel Orientation="Horizontal" />
                        </ItemsPanelTemplate>
                    </GridView.ItemsPanel>
                </GridView>
            </SemanticZoom.ZoomedInView>
    
            <!--
                縮小後的視圖,概述數據
            -->
            <SemanticZoom.ZoomedOutView>
                <GridView Name="gridViewSummary" HorizontalAlignment="Left" Padding="120 0 0 0">
                    <GridView.ItemTemplate>
                        <DataTemplate>
                            <Grid Background="#022a56" Width="100" Height="100">
                                <!--
                                    每組數據的 header 數據源來自 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

/*
 * 本頁為此 app 的導航頁,同時用於演示:
 * 1、ItemsControl 控件如何分組
 * 2、SemanticZoom 控件的應用
 * 
 * 
 * SemanticZoom - 用於關聯兩個有語義關系的視圖
 *     ZoomedInView - 放大後的視圖,詳細數據
 *     ZoomedOutView - 縮小後的視圖,概述數據
 *     IsZoomedInViewActive - ZoomedInView 是否為當前正在顯示的視圖
 *     CanChangeViews - 是否可在兩個視圖間切換
 *     IsZoomOutButtonEnabled - 是否顯示用於切換視圖的按鈕
 *     ToggleActiveView() - 切換視圖
 *     ViewChangeStarted - 視圖開始切換時觸發的事件 
 *     ViewChangeCompleted - 視圖切換完成時觸發的事件
 *     
 * 
 * ItemsControl - 一個用於呈現集合數據的控件(GridView, ListView, FlipView, ListBox 等均直接或間接地繼承了 ItemsControl)
 *     ItemsControl 控件提供了分組功能
 *     
 * CollectionViewSource - 對集合數據啟用分組支持
 *     Source - 數據源
 *     View - 獲取視圖對象,返回一個實現了 ICollectionView 接口的對象
 *     IsSourceGrouped - 數據源是否是一個被分組的數據
 *     ItemsPath - 數據源中,子數據集合的屬性名稱
 *     
 * ICollectionView - 支持數據分組
 *     CollectionGroups - 組數據集合
 */
    
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
    {
        // 本頁所用到的 GridView 的水平方向上的滾動值
        private double _scrollViewerHorizontalOffset = 0;
    
        public Index()
        {
            this.InitializeComponent();
    
            XElement root = XElement.Load("SiteMap.xml");
            var items = LoadData(root);
    
            // 構造數據源
            CollectionViewSource groupedNavigationData = new CollectionViewSource();
            groupedNavigationData.IsSourceGrouped = true;
            groupedNavigationData.Source = items;
            groupedNavigationData.ItemsPath = new PropertyPath("Items");
    
            // 綁定數據
            gridViewDetails.ItemsSource = groupedNavigationData.View; // 全部數據
            gridViewSummary.ItemsSource = groupedNavigationData.View.CollectionGroups; // 關聯的組數據集合
    
            // 必須緩存此頁
            this.NavigationCacheMode = NavigationCacheMode.Required;
    
            gridViewDetails.Loaded += gridViewDetails_Loaded;
        }
    
        // 導航到其它頁之前,保存本頁所用到的 GridView 的水平方向上的滾動值
        protected override void OnNavigatedFrom(NavigationEventArgs e)
        {
            var scrollViewer = Helper.GetVisualChild<ScrollViewer>(gridViewDetails);
            _scrollViewerHorizontalOffset = scrollViewer.HorizontalOffset;
        }
    
        // GridView 加載之後,指定其水平方向上的滾動值
        void gridViewDetails_Loaded(object sender, RoutedEventArgs e)
        {
            var scrollViewer = Helper.GetVisualChild<ScrollViewer>(gridViewDetails);
            scrollViewer.ScrollToHorizontalOffset(_scrollViewerHorizontalOffset);
        }
    
        // 獲取數據
        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();
        }
    
        // 導航到指定的 Demo 頁
        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));
        }
    
        // 根據屏幕的 height 調整 VariableSizedWrapGrid 的 MaximumRowsOrColumns
        // 本例會自動 wrap ,所以不需要以下邏輯,在需要的場景下可以用之
        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、演示如何自定義 SemanticZoom 視圖

SemanticZoom/MyFlipView.cs

/*
 * 開發一個實現了 ISemanticZoomInformation 接口的自定義 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 時觸發的事件
        /// </summary>
        /// <param name="source">在 ZoomedOutView 時被選中的數據</param>
        /// <param name="destination">需要傳遞給 ZoomedInView 的數據</param>
        public void StartViewChangeTo(SemanticZoomLocation source, SemanticZoomLocation destination)
        {
            /*
             * 注:
             * GridView 和 ListView 均實現了 ISemanticZoomInformation 接口
             * 參見本 app 的關於 SemanticZoom 的 Demo,通過 CollectionViewSource 綁定數據即可使 SemanticZoom 中的兩個視圖進行有關聯地切換
             * 此時此處的 source.Item 便為一個 ICollectionViewGroup 類型的數據,其有兩個屬性:Group 和 GroupItems
             */
    
    
            // 獲取在 ZoomedOutView 中被選中的項,即被選中的父親
            NavigationModel model = source.Item as NavigationModel;
            // 將此父親的所有子數據傳遞給 ZoomedInView,接下來會執行 MakeVisible() 方法
            destination.Item = model.Items;
        }
    
        /// <summary>
        /// 開始 ZoomedOutView -> ZoomedInView 之後,會調用此方法
        /// 一般在此處重整 ZoomedInView 的數據源,或者滾動 ZoomedInView 中的內容到指定的項以對應 ZoomedOutView 中被選中的數據
        /// </summary>
        /// <param name="item">由 StartViewChangeTo() 方法傳遞給 ZoomedInView 的數據

</param>
        public void MakeVisible(SemanticZoomLocation item)
        {
            // 將 FlipView 的數據源指定為被選中的父親的所有子數據
            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">
            <!--
                放大後的視圖,詳細數據
            -->
            <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>
    
            <!--
                縮小後的視圖,概述數據
            -->
            <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

/*
 * 演示如何自定義 SemanticZoom 視圖 
 * 演示步驟:
 * 1、在 ZoomedOutView 視圖中的 GridView 中選中某一項
 * 2、展開 ZoomedInView 視圖後,其內的 FlipView 顯示之前被選中項的所有子數據(需要開發一個實現了 

ISemanticZoomInformation 接口的自定義 FlipView,參見 MyFlipView.cs)
 * 
 * 注:
 * GridView 和 ListView 均實現了 ISemanticZoomInformation 接口,所以可以在 SemanticZoom 的兩個視

圖間有關聯地切換
 * 要讓其它控件也實現類似的功能,就必須使其實現 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);
    
            // 綁定數據
            gridView.ItemsSource = items;
        }
    
        // 獲取數據
        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

[源碼下載]:http://files.cnblogs.com/webabcd/Windows8.rar

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