1、自定义 ItemsControl(自定义 GirdView 使其每个 item 占用不同大小的空间)
Controls/CollectionControl/ItemsControlDemo/MyItemsControlDemo.xaml
<Pagex:Class=Windows10.Controls.CollectionControl.ItemsControlDemo.MyItemsControlDemoxmlns=http://schemas.microsoft.com/winfx/2006/xaml/presentationxmlns:x=http://schemas.microsoft.com/winfx/2006/xamlxmlns:local=using:Windows10.Controls.CollectionControl.ItemsControlDemoxmlns:d=http://schemas.microsoft.com/expression/blend/2008xmlns:mc=http://schemas.openxmlformats.org/markup-compatibility/2006mc: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>
Controls/CollectionControl/ItemsControlDemo/MyItemsControlDemo.xaml.cs
/* * 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); } } } }
2、自定义 ContentPresenter 实现类似 GridViewItemPresenter 和 ListViewItemPresenter 的效果
Controls/CollectionControl/ItemsControlDemo/MyItemPresenter.cs
/* * 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; } } }
Controls/CollectionControl/ItemsControlDemo/MyItemPresenterDemo.xaml
<Pagex:Class=Windows10.Controls.CollectionControl.ItemsControlDemo.MyItemPresenterDemoxmlns=http://schemas.microsoft.com/winfx/2006/xaml/presentationxmlns:x=http://schemas.microsoft.com/winfx/2006/xamlxmlns:local=using:Windows10.Controls.CollectionControl.ItemsControlDemoxmlns:d=http://schemas.microsoft.com/expression/blend/2008xmlns:mc=http://schemas.openxmlformats.org/markup-compatibility/2006mc: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>
Controls/CollectionControl/ItemsControlDemo/MyItemPresenterDemo.xaml.cs
/* * 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(); } } }
OK
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