Windows 10 - 控件（集合类）的详细介绍

<Pagex:Class="Windows10.Controls.CollectionControl.ItemsControlDemo.MyItemsControlDemo"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"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"mc:Ignorable="d"><Page.Resources><DataTemplate x:Key="ItemTemplate"><Grid Background="{Binding ColorValue}"><Grid Background="Black" VerticalAlignment="Top" Opacity="0.7"><TextBlock Text="{Binding ColorName}" /></Grid></Grid></DataTemplate><Style x:Key="ItemContainerStyle" TargetType="GridViewItem"><Setter Property="VerticalContentAlignment" Value="Stretch" /><Setter Property="HorizontalContentAlignment" Value="Stretch" /><Setter Property="Margin" Value="0" /><Setter Property="Padding" Value="0" /></Style><ItemsPanelTemplate x:Key="ItemsPanel"><VariableSizedWrapGrid MaximumRowsOrColumns="8" Orientation="Horizontal" ItemWidth="100" ItemHeight="100"  /></ItemsPanelTemplate></Page.Resources><Grid Background="Transparent" Margin="10 0 10 10"><!--使用 MyGridView 控件，其重写了 GridView 的 PrepareContainerForItemOverride() 方法，详见 MyGridView.cs--><local:MyGridView x:Name="gridView" Width="812" VerticalAlignment="Top" HorizontalAlignment="Left"  ItemTemplate="{StaticResource ItemTemplate}"  ItemContainerStyle="{StaticResource ItemContainerStyle}"  ItemsPanel="{StaticResource ItemsPanel}"                             IsItemClickEnabled="False"                             SelectionMode="None"></local:MyGridView></Grid></Page>

/*   * ItemsControl - 集合控件（继承自 Control, 请参见 /Controls/BaseControl/ControlDemo/）   *     protected virtual void PrepareContainerForItemOverride(DependencyObject element, object item); - 为 item 准备 container 时   *         element - item 的 container   *         item - item   *            *    * 本例用于演示如何使 GirdView 中的每个 item 占用不同大小的空间   * 1、布局控件要使用 VariableSizedWrapGrid（利用其 RowSpan 和 ColumnSpan 来实现 item 占用不同大小的空间），需要注意的是其并非是虚拟化布局控件   * 2、自定义 GridView，并重写 ItemsControl 的 protected override void PrepareContainerForItemOverride(DependencyObject element, object item) 方法   *    然后设置每个 item 的 VariableSizedWrapGrid.RowSpan 和 VariableSizedWrapGrid.ColumnSpan */using System;using System.Collections.Generic;using System.Linq;using Windows.UI;using Windows.UI.Xaml;using Windows.UI.Xaml.Controls;using Windows.UI.Xaml.Media;using System.Reflection;namespace Windows10.Controls.CollectionControl.ItemsControlDemo  {public sealed partial class MyItemsControlDemo : Page      {public MyItemsControlDemo()          {this.InitializeComponent();                   BindData();          }private void BindData()          {              Random random = new Random();// 获取 Windows.UI.Colors 的全部数据Type type = typeof(Colors);              List<ColorModel> colors = type.GetRuntimeProperties() // GetRuntimeProperties() 在 System.Reflection 命名空间下.Select(c => new ColorModel                  {                      ColorName = c.Name,                      ColorValue = new SolidColorBrush((Color)c.GetValue(null)),                      ColSpan = random.Next(1, 3), // 此对象所占网格的列合并数RowSpan = random.Next(1, 3) // 此对象所占网格的行合并数                })                  .ToList();// 绑定数据gridView.ItemsSource = colors;          }      }/// <summary>/// 用于数据绑定的对象/// </summary>public class ColorModel      {public string ColorName { get; set; }public SolidColorBrush ColorValue { get; set; }// 此对象所占的网格的列合并数public int ColSpan { get; set; }// 此对象所占的网格的行合并数public int RowSpan { get; set; }      }/// <summary>/// 自定义 GridView，重写 ItemsControl 的 protected override void PrepareContainerForItemOverride(DependencyObject element, object item) 方法/// 用于指定 GridView 的每个 item 所占网格的列合并数和行合并数/// </summary>public class MyGridView : GridView      {protected override void PrepareContainerForItemOverride(DependencyObject element, object item)          {try{// 设置每个 item 的 VariableSizedWrapGrid.RowSpan 和 VariableSizedWrapGrid.ColumnSpan, 从而实现每个 item 占用不同大小的空间// 仅为演示用，由于这里的 ColSpan 和 RowSpan 都是随机计算的，所以可能会出现空白空间dynamic dynamicItem = item;                  element.SetValue(VariableSizedWrapGrid.ColumnSpanProperty, dynamicItem.ColSpan);                  element.SetValue(VariableSizedWrapGrid.RowSpanProperty, dynamicItem.RowSpan);              }catch (Exception ex)              {var ignore = ex;// 当有异常情况发生时（比如：item 没有 ColSpan 属性或 RowSpan 属性）element.SetValue(VariableSizedWrapGrid.ColumnSpanProperty, 1);                  element.SetValue(VariableSizedWrapGrid.RowSpanProperty, 1);              }finally{base.PrepareContainerForItemOverride(element, item);              }          }      }  }

/*   * 自定义 ContentPresenter 实现类似 GridViewItemPresenter 和 ListViewItemPresenter 的效果 */using System;using Windows.Foundation;using Windows.UI;using Windows.UI.Xaml;using Windows.UI.Xaml.Controls;using Windows.UI.Xaml.Media;using Windows.UI.Xaml.Media.Animation;using Windows.UI.Xaml.Shapes;namespace Windows10.Controls.CollectionControl.ItemsControlDemo  {class MyItemPresenter : ContentPresenter      {          Panel _container = null; // item 的容器（即在 DataTemplate 中定义的根元素，在示例 MyItemPresenterDemo.xaml 中用的是 Grid）Rectangle _pointerOverBorder = null; // 鼠标经过 item 时覆盖在 item 上的 rectangleRectangle _focusVisual = null; // 选中 item 时覆盖在 item 上的 rectangleStoryboard _pointerDownStoryboard = null; // 鼠标按下时的动画Storyboard _pointerUpStoryboard = null; // 鼠标抬起时的动画public MyItemPresenter()              : base()          {base.Margin = new Thickness(10);          }// override OnApplyTemplate() - 应用控件模板时调用protected override void OnApplyTemplate()          {base.OnApplyTemplate();                _container = (Panel)VisualTreeHelper.GetChild(this, 0);          }// override GoToElementStateCore() - VisualState 转换时调用（此方法仅在自定义 ContentPresenter 并将其应用于 GridView 或 ListView 的 ItemContainerStyle 时才会被调用）//     stateName - VisualState 的名字//     useTransitions - 是否使用 VisualTransition 过渡效果protected override bool GoToElementStateCore(string stateName, bool useTransitions)          {base.GoToElementStateCore(stateName, useTransitions);switch (stateName)              {// 正常状态case "Normal":                      HidePointerOverVisuals();                      HideFocusVisuals();if (useTransitions)                      {                          StopPointerDownAnimation();                      }break;// 选中状态case "Selected":case "PointerFocused":                      ShowFocusVisuals();if (useTransitions)                      {                          StopPointerDownAnimation();                      }break;// 取消选中状态case "Unfocused":                      HideFocusVisuals();break;// 鼠标经过状态case "PointerOver":                      ShowPointerOverVisuals();if (useTransitions)                      {                          StopPointerDownAnimation();                      }break;// 鼠标点击状态case "Pressed":case "PressedSelected":if (useTransitions)                      {                          StartPointerDownAnimation();                      }break;default: break;              }return true;          }private void StartPointerDownAnimation()          {if (_pointerDownStoryboard == null)                  CreatePointerDownStoryboard();                _pointerDownStoryboard.Begin();          }private void StopPointerDownAnimation()          {if (_pointerUpStoryboard == null)                  CreatePointerUpStoryboard();                _pointerUpStoryboard.Begin();          }private void ShowFocusVisuals()          {if (!FocusElementsAreCreated())                  CreateFocusElements();                _focusVisual.Opacity = 1;          }private void HideFocusVisuals()          {if (FocusElementsAreCreated())                  _focusVisual.Opacity = 0;          }private void ShowPointerOverVisuals()          {if (!PointerOverElementsAreCreated())                  CreatePointerOverElements();                _pointerOverBorder.Opacity = 1;          }private void HidePointerOverVisuals()          {if (PointerOverElementsAreCreated())                  _pointerOverBorder.Opacity = 0;          }private void CreatePointerDownStoryboard()          {/* * 用这种方式为 item 实现鼠标按下的效果会报错（Attempted to read or write protected memory. This is often an indication that other memory is corrupt.），不知道为什么               * PointerDownThemeAnimation pointerDownAnimation = new PointerDownThemeAnimation();               * Storyboard.SetTarget(pointerDownAnimation, _container);               * Storyboard pointerDownStoryboard = new Storyboard();               * pointerDownStoryboard.Children.Add(pointerDownAnimation);             */DoubleAnimation da1 = new DoubleAnimation()              {                  To = 0.9,                  Duration = TimeSpan.FromMilliseconds(100)              };              DoubleAnimation da2 = new DoubleAnimation()              {                  To = 0.9,                  Duration = TimeSpan.FromMilliseconds(100)              };              Storyboard.SetTarget(da1, _container);              Storyboard.SetTargetProperty(da1, "(UIElement.RenderTransform).(TransformGroup.Children)[0].(ScaleTransform.ScaleX)");              Storyboard.SetTarget(da2, _container);              Storyboard.SetTargetProperty(da2, "(UIElement.RenderTransform).(TransformGroup.Children)[0].(ScaleTransform.ScaleY)");if (!(_container.RenderTransform is TransformGroup))              {                  TransformGroup Group = new TransformGroup();                  Group.Children.Add(new ScaleTransform());                  _container.RenderTransform = Group;                  _container.RenderTransformOrigin = new Point(0.5, 0.5);              }                _pointerDownStoryboard = new Storyboard();              _pointerDownStoryboard.Children.Add(da1);              _pointerDownStoryboard.Children.Add(da2);              _pointerDownStoryboard.Begin();          }private void CreatePointerUpStoryboard()          {              DoubleAnimation da1 = new DoubleAnimation()              {                  To = 1,                  Duration = TimeSpan.FromMilliseconds(100)              };              DoubleAnimation da2 = new DoubleAnimation()              {                  To = 1,                  Duration = TimeSpan.FromMilliseconds(100)              };              Storyboard.SetTarget(da1, _container);              Storyboard.SetTargetProperty(da1, "(UIElement.RenderTransform).(TransformGroup.Children)[0].(ScaleTransform.ScaleX)");              Storyboard.SetTarget(da2, _container);              Storyboard.SetTargetProperty(da2, "(UIElement.RenderTransform).(TransformGroup.Children)[0].(ScaleTransform.ScaleY)");if (!(_container.RenderTransform is TransformGroup))              {                  TransformGroup Group = new TransformGroup();                  Group.Children.Add(new ScaleTransform());                  _container.RenderTransform = Group;                  _container.RenderTransformOrigin = new Point(0.5, 0.5);              }                _pointerUpStoryboard = new Storyboard();              _pointerUpStoryboard.Children.Add(da1);              _pointerUpStoryboard.Children.Add(da2);              _pointerUpStoryboard.Begin();          }private void CreatePointerOverElements()          {              _pointerOverBorder = new Rectangle();              _pointerOverBorder.IsHitTestVisible = false;              _pointerOverBorder.Opacity = 0;// 这里把颜色写死了，仅为演示用，实际写的时候要摘出来写成依赖属性_pointerOverBorder.Fill = new SolidColorBrush(Color.FromArgb(0x50, 0x50, 0x50, 0x50));                _container.Children.Insert(_container.Children.Count, _pointerOverBorder);          }private void CreateFocusElements()          {              _focusVisual = new Rectangle();              _focusVisual.IsHitTestVisible = false;              _focusVisual.Height = 10;              _focusVisual.VerticalAlignment = VerticalAlignment.Bottom;// 这里把颜色写死了，仅为演示用，实际写的时候要摘出来写成依赖属性_focusVisual.Fill = new SolidColorBrush(Color.FromArgb(0xff, 0xff, 0x0, 0x0));                _container.Children.Insert(0, _focusVisual);          }private bool FocusElementsAreCreated()          {return _focusVisual != null;          }private bool PointerOverElementsAreCreated()          {return _pointerOverBorder != null;          }      }  }

<Pagex:Class="Windows10.Controls.CollectionControl.ItemsControlDemo.MyItemPresenterDemo"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"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"mc:Ignorable="d"><Page.Resources><Style x:Key="MyGridViewItemPresenterTemplate" TargetType="GridViewItem"><Setter Property="Background" Value="Transparent"/><Setter Property="Template"><Setter.Value><ControlTemplate TargetType="GridViewItem"><!--自定义 ContentPresenter 实现类似 GridViewItemPresenter 和 ListViewItemPresenter 的效果--><local:MyItemPresenter /></ControlTemplate></Setter.Value></Setter></Style></Page.Resources><Grid Background="Transparent"><GridView x:Name="gridView" SelectionMode="Single" Margin="10 0 10 10"                     ItemContainerStyle="{StaticResource MyGridViewItemPresenterTemplate}"><GridView.ItemTemplate><DataTemplate><Grid Height="100" Width="100" Background="Blue"><TextBlock x:Name="lblName" Text="{Binding Name}" Foreground="Yellow" /></Grid></DataTemplate></GridView.ItemTemplate></GridView></Grid></Page>

/*   * 本例用于演示如何自定义 ContentPresenter 实现类似 GridViewItemPresenter 和 ListViewItemPresenter 的效果 */using Windows.UI.Xaml.Controls;using Windows.UI.Xaml.Navigation;using Windows10.Common;namespace Windows10.Controls.CollectionControl.ItemsControlDemo  {public sealed partial class MyItemPresenterDemo : Page      {public MyItemPresenterDemo()          {this.InitializeComponent();          }protected override void OnNavigatedTo(NavigationEventArgs e)          {              gridView.ItemsSource = TestData.GetEmployees();          }      }  }