ItemsControl 的布局控件实例

<Pagex:Class="Windows10.Controls.CollectionControl.ItemsControlDemo.LayoutControl.ItemsStackPanelDemo"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:local="using:Windows10.Controls.CollectionControl.ItemsControlDemo.LayoutControl"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"mc:Ignorable="d"
    xmlns:common="using:Windows10.Common"><Grid Background="Transparent"><StackPanel Margin="10 0 10 10" Orientation="Horizontal"><StackPanel Margin="5"><!--ItemsStackPanel - 虚拟化布局控件，ListView 的默认布局控件
                        Orientation - 子元素的排列方向
                            Vertical - 垂直排列，默认值
                            Horizontal - 水平排列
                        CacheLength - 可见区外的需要缓存的数据的大小（以可见区条数大小的倍数为单位），默认值为 4.0
                            比如当可见区可以显示 10 条数据，CacheLength 为 4 时，可见区外的需要缓存的数据的大小则为 4 * 10 = 40，也就是说整个缓存数据的大小为 10 + 4 * 10 = 50
                            实际测试发现，可能会有一定的偏差，但是大体是准确的--><ListView Name="listView1" Margin="5" Width="400" Height="400" HorizontalAlignment="Left" ItemsSource="{x:Bind MyData.View}"><ListView.ItemTemplate><DataTemplate x:DataType="common:NavigationModel"><Grid Background="Blue"><TextBlock Text="{x:Bind Title}" /></Grid></DataTemplate></ListView.ItemTemplate><ListView.ItemsPanel><ItemsPanelTemplate><ItemsStackPanel Orientation="Vertical" CacheLength="4" /></ItemsPanelTemplate></ListView.ItemsPanel></ListView><TextBlock Name="lblMsg1" Margin="5" /></StackPanel><StackPanel Margin="5"><!--ItemsStackPanel - 虚拟化布局控件，ListView 的默认布局控件
                        GroupPadding - 每一个数据组的 padding
                        GroupHeaderPlacement - 每一个数据组的 header 的显示位置
                            Top - 顶部。默认值
                            Left - 左侧
                        AreStickyGroupHeadersEnabled - 组 header 是否是固定的，即不随组数据的滚动而滚动。默认值为 true--><ListView Name="listView2" Margin="5" Width="400" Height="400" HorizontalAlignment="Left" ItemsSource="{x:Bind MyData.View}"><ListView.GroupStyle><GroupStyle><GroupStyle.HeaderTemplate><DataTemplate><TextBlock Text="{Binding Title}" /></DataTemplate></GroupStyle.HeaderTemplate></GroupStyle></ListView.GroupStyle><ListView.ItemTemplate><DataTemplate><TextBlock Text="{Binding Title}" /></DataTemplate></ListView.ItemTemplate><ListView.ItemsPanel><ItemsPanelTemplate><ItemsStackPanel GroupPadding="4"  
                                             GroupHeaderPlacement="Top" 
                                             AreStickyGroupHeadersEnabled="{Binding IsChecked, ElementName=chkAreStickyGroupHeadersEnabled}" /></ItemsPanelTemplate></ListView.ItemsPanel></ListView><ComboBox x:Name="cmbGroupHeaderPlacement" Margin="5" PlaceholderText="GroupHeaderPlacement" SelectionChanged="cmbGroupHeaderPlacement_SelectionChanged"><ComboBoxItem>Top</ComboBoxItem><ComboBoxItem>Left</ComboBoxItem></ComboBox><CheckBox Name="chkAreStickyGroupHeadersEnabled" Content="AreStickyGroupHeadersEnabled" IsChecked="True" Margin="5" /></StackPanel></StackPanel></Grid></Page>

/*
 * ItemsStackPanel - 虚拟化布局控件，ListView 的默认布局控件（继承自 Panel, 请参见 /Controls/LayoutControl/PanelDemo.xaml）
 *     FirstCacheIndex - 缓存中的第一项在全部数据中的索引位置
 *     FirstVisibleIndex - 屏幕上显示的第一项在全部数据中的索引位置
 *     LastCacheIndex - 缓存中的最后一项在全部数据中的索引位置
 *     LastVisibleIndex - 屏幕上显示的最后一项在全部数据中的索引位置
 *     CacheLength - 可见区外的需要缓存的数据的大小（以可见区条数大小的倍数为单位），默认值为 4.0
 *         比如当可见区可以显示 10 条数据，CacheLength 为 4 时，可见区外的需要缓存的数据的大小则为 4 * 10 = 40，也就是说整个缓存数据的大小为 10 + 4 * 10 = 50
 *         实际测试发现，可能会有一定的偏差，但是大体是准确的 */using System;using System.Collections.Generic;using System.Linq;using System.Xml.Linq;using Windows.UI.Xaml;using Windows.UI.Xaml.Controls;using Windows.UI.Xaml.Controls.Primitives;using Windows.UI.Xaml.Data;using Windows10.Common;namespace Windows10.Controls.CollectionControl.ItemsControlDemo.LayoutControl
{public sealed partial class ItemsStackPanelDemo : Page
    {public CollectionViewSource MyData
        {get{
                XElement root = XElement.Load("SiteMap.xml");var items = LoadData(root);// 构造数据源CollectionViewSource source = new CollectionViewSource();
                source.IsSourceGrouped = true;
                source.Source = items;
                source.ItemsPath = new PropertyPath("Items");return source;
            }
        }        private ItemsStackPanel _itemsStackPanel1 = null;private ItemsStackPanel _itemsStackPanel2 = null;public ItemsStackPanelDemo()
        {this.InitializeComponent();this.Loaded += ItemsStackPanelDemo_Loaded;
        }private void ItemsStackPanelDemo_Loaded(object sender, RoutedEventArgs e)
        {
            DispatcherTimer dTimer = new DispatcherTimer();
            dTimer.Interval = TimeSpan.Zero;
            dTimer.Tick += DTimer_Tick;
            dTimer.Start();// 获取 ListView 中的 ItemsStackPanel 控件_itemsStackPanel1 = listView1.ItemsPanelRoot as ItemsStackPanel;
            _itemsStackPanel2 = listView2.ItemsPanelRoot as ItemsStackPanel;// 获取 ListView 中的 ItemsStackPanel 控件// _itemsStackPanel1 = Helper.GetVisualChild<ItemsStackPanel>(listView1);// _itemsStackPanel2 = Helper.GetVisualChild<ItemsStackPanel>(listView2);        }private void DTimer_Tick(object sender, object e)
        {
            lblMsg1.Text = "FirstCacheIndex: " + _itemsStackPanel1.FirstCacheIndex.ToString();
            lblMsg1.Text += Environment.NewLine;
            lblMsg1.Text += "FirstVisibleIndex: " + _itemsStackPanel1.FirstVisibleIndex.ToString();
            lblMsg1.Text += Environment.NewLine;
            lblMsg1.Text += "LastCacheIndex: " + _itemsStackPanel1.LastCacheIndex.ToString();
            lblMsg1.Text += Environment.NewLine;
            lblMsg1.Text += "LastVisibleIndex: " + _itemsStackPanel1.LastVisibleIndex.ToString();
            lblMsg1.Text += Environment.NewLine;
            lblMsg1.Text += "CacheLength: " + _itemsStackPanel1.CacheLength.ToString();
        }private void cmbGroupHeaderPlacement_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            _itemsStackPanel2.GroupHeaderPlacement = (GroupHeaderPlacement)Enum.Parse(typeof(GroupHeaderPlacement), (e.AddedItems[0] as ComboBoxItem).Content.ToString());
        }// 解析 xml 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();
        }
    }
}

<Pagex:Class="Windows10.Controls.CollectionControl.ItemsControlDemo.LayoutControl.ItemsWrapGridDemo"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:local="using:Windows10.Controls.CollectionControl.ItemsControlDemo.LayoutControl"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"mc:Ignorable="d"
    xmlns:common="using:Windows10.Common"><Grid Background="Transparent"><StackPanel Margin="10 0 10 10" Orientation="Horizontal"><StackPanel Margin="5"><!--ItemsWrapGrid - 虚拟化布局控件，GridView 的默认布局控件
                        Orientation - 子元素的排列方向
                            Vertical - 垂直排列，默认值
                            Horizontal - 水平排列
                        ItemWidth - 每个 item 的宽
                        ItemHeight - 每个 item 的高
                        MaximumRowsOrColumns - 最大行数或最大列数（默认值为 -1）
                        CacheLength - 可见区外的需要缓存的数据的大小（以可见区条数大小的倍数为单位），默认值为 4.0
                            比如当可见区可以显示 10 条数据，CacheLength 为 4 时，可见区外的需要缓存的数据的大小则为 4 * 10 = 40，也就是说整个缓存数据的大小为 10 + 4 * 10 = 50
                            实际测试发现，可能会有一定的偏差，但是大体是准确的--><GridView Name="gridView1" Margin="5" Width="400" Height="400" HorizontalAlignment="Left" ItemsSource="{x:Bind MyData.View}"><GridView.ItemTemplate><DataTemplate x:DataType="common:NavigationModel"><Grid Background="Blue"><TextBlock Text="{x:Bind Title}" /></Grid></DataTemplate></GridView.ItemTemplate><GridView.ItemsPanel><ItemsPanelTemplate><ItemsWrapGrid Orientation="Horizontal" ItemWidth="120" ItemHeight="50" MaximumRowsOrColumns="3" CacheLength="4" /></ItemsPanelTemplate></GridView.ItemsPanel></GridView><TextBlock Name="lblMsg1" Margin="5" /></StackPanel><StackPanel Margin="5"><!--ItemsWrapGrid - 虚拟化布局控件，GridView 的默认布局控件
                        GroupPadding - 每一个数据组的 padding
                        GroupHeaderPlacement - 每一个数据组的 header 的显示位置
                            Top - 顶部。默认值
                            Left - 左侧
                        AreStickyGroupHeadersEnabled - 组 header 是否是固定的，即不随组数据的滚动而滚动。默认值为 true--><ListView Name="gridView2" Margin="5" Width="400" Height="400" HorizontalAlignment="Left" ItemsSource="{x:Bind MyData.View}"><ListView.GroupStyle><GroupStyle><GroupStyle.HeaderTemplate><DataTemplate><TextBlock Text="{Binding Title}" /></DataTemplate></GroupStyle.HeaderTemplate></GroupStyle></ListView.GroupStyle><ListView.ItemTemplate><DataTemplate><TextBlock Text="{Binding Title}" Width="100" /></DataTemplate></ListView.ItemTemplate><ListView.ItemsPanel><ItemsPanelTemplate><ItemsWrapGrid Orientation="Horizontal" MaximumRowsOrColumns="3"   GroupPadding="4"   GroupHeaderPlacement="Top" 
                                           AreStickyGroupHeadersEnabled="{Binding IsChecked, ElementName=chkAreStickyGroupHeadersEnabled}" /></ItemsPanelTemplate></ListView.ItemsPanel></ListView><ComboBox x:Name="cmbGroupHeaderPlacement" Margin="5" PlaceholderText="GroupHeaderPlacement" SelectionChanged="cmbGroupHeaderPlacement_SelectionChanged"><ComboBoxItem>Top</ComboBoxItem><ComboBoxItem>Left</ComboBoxItem></ComboBox><CheckBox Name="chkAreStickyGroupHeadersEnabled" Content="AreStickyGroupHeadersEnabled" IsChecked="True" Margin="5" /></StackPanel></StackPanel></Grid></Page>

/*
 * ItemsWrapGrid - 虚拟化布局控件，GridView 的默认布局控件（继承自 Panel, 请参见 /Controls/LayoutControl/PanelDemo.xaml）
 *     FirstCacheIndex - 缓存中的第一项在全部数据中的索引位置
 *     FirstVisibleIndex - 屏幕上显示的第一项在全部数据中的索引位置
 *     LastCacheIndex - 缓存中的最后一项在全部数据中的索引位置
 *     LastVisibleIndex - 屏幕上显示的最后一项在全部数据中的索引位置
 *     CacheLength - 可见区外的需要缓存的数据的大小（以可见区条数大小的倍数为单位），默认值为 4.0
 *         比如当可见区可以显示 10 条数据，CacheLength 为 4 时，可见区外的需要缓存的数据的大小则为 4 * 10 = 40，也就是说整个缓存数据的大小为 10 + 4 * 10 = 50
 *         实际测试发现，可能会有一定的偏差，但是大体是准确的 */using System;using System.Collections.Generic;using System.Linq;using System.Xml.Linq;using Windows.UI.Xaml;using Windows.UI.Xaml.Controls;using Windows.UI.Xaml.Controls.Primitives;using Windows.UI.Xaml.Data;using Windows10.Common;namespace Windows10.Controls.CollectionControl.ItemsControlDemo.LayoutControl
{public sealed partial class ItemsWrapGridDemo : Page
    {public CollectionViewSource MyData
        {get{
                XElement root = XElement.Load("SiteMap.xml");var items = LoadData(root);// 构造数据源CollectionViewSource source = new CollectionViewSource();
                source.IsSourceGrouped = true;
                source.Source = items;
                source.ItemsPath = new PropertyPath("Items");return source;
            }
        }private ItemsWrapGrid _itemsWrapGrid1 = null;private ItemsWrapGrid _itemsWrapGrid2 = null;public ItemsWrapGridDemo()
        {this.InitializeComponent();this.Loaded += ItemsWrapGridDemo_Loaded;
        }private void ItemsWrapGridDemo_Loaded(object sender, RoutedEventArgs e)
        {
            DispatcherTimer dTimer = new DispatcherTimer();
            dTimer.Interval = TimeSpan.Zero;
            dTimer.Tick += DTimer_Tick;
            dTimer.Start();// 获取 GridView 中的 ItemsWrapGrid 控件_itemsWrapGrid1 = gridView1.ItemsPanelRoot as ItemsWrapGrid;
            _itemsWrapGrid2 = gridView2.ItemsPanelRoot as ItemsWrapGrid;// 获取 GridView 中的 ItemsWrapGrid 控件// _itemsWrapGrid1 = Helper.GetVisualChild<ItemsWrapGrid>(gridView1);// _itemsWrapGrid2 = Helper.GetVisualChild<ItemsWrapGrid>(gridView2);        }private void DTimer_Tick(object sender, object e)
        {
            lblMsg1.Text = "FirstCacheIndex: " + _itemsWrapGrid1.FirstCacheIndex.ToString();
            lblMsg1.Text += Environment.NewLine;
            lblMsg1.Text += "FirstVisibleIndex: " + _itemsWrapGrid1.FirstVisibleIndex.ToString();
            lblMsg1.Text += Environment.NewLine;
            lblMsg1.Text += "LastCacheIndex: " + _itemsWrapGrid1.LastCacheIndex.ToString();
            lblMsg1.Text += Environment.NewLine;
            lblMsg1.Text += "LastVisibleIndex: " + _itemsWrapGrid1.LastVisibleIndex.ToString();
            lblMsg1.Text += Environment.NewLine;
            lblMsg1.Text += "CacheLength: " + _itemsWrapGrid1.CacheLength.ToString();
        }private void cmbGroupHeaderPlacement_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            _itemsWrapGrid2.GroupHeaderPlacement = (GroupHeaderPlacement)Enum.Parse(typeof(GroupHeaderPlacement), (e.AddedItems[0] as ComboBoxItem).Content.ToString());
        }// 解析 xml 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();
        }
    }
}