示例
1、ItemsStackPanel 적폐
<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>
Controls/CollectionControl/ItemsControlDemo/LayoutControl/ItemsWrapGridDemo.xaml
/* * 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(); } } }
Controls/CollectionControl/ItemsControlDemo/LayoutControl/ItemsWrapGridDemo.xaml.cs
<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>
OK
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