例
1. ItemsControl をカスタマイズします (各項目が異なるサイズのスペースを占めるように GirdView をカスタマイズします)
<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);
}
}
}
}2.ContentPresenter をカスタマイズして、GridViewItemPresenter および ListViewItemPresenter と同様の効果を実現します
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;
}
}
}<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>
OK
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