在WinRT的ListView的项目插入动画 [英] ListView's item insert animations in WinRT
本文介绍了在WinRT的ListView的项目插入动画的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
最近，我开始建设自己的大的Windows 8 Store应用。
上的用户界面的工作，我开始复制一些很好的用户界面。
Recently I started building my own big Windows 8 Store App. Working on UI I started replicating some good UIs.
一个我遇到插入在标准的邮件应用程序列表视图中的新元素非常有趣的动画。当你点击它链的扩展和显示链中的所有消息。
One I met very interesting animation of inserting new elements in list view in standard Mail app. When you click on chain it expands and shows all messages in chain.
这里被捕获的视频
我不知道他们是否用什么技术来实现这个动画和行为。
I have no idea what technique did they use to achieve this animation and behavior.
有人能帮助我解释一下，或给的例子，我如何能实现这样的行为？谢谢你。
Can anyone help me, explain or give example how can I achieve such behavior? Thanks.
推荐答案
邮件应用程序是用JavaScript编写的，所以它不会帮助你多少知道它是怎么做的，因为此UI栈比XAML有很大的区别。事情虽然是列表控件可能动画以同样的方式，所以你只需要添加/删除列表中的一些项目得到扩展/折叠的效果。
The mail app is written in JavaScript, so it won't help you much to know how it was done since this UI stack is quite different than the XAML one. The thing though is that the list controls are likely animated the same way, so you only need to add/remove some items in the list to get the expansion/collapse effect.
我打了它一下，这是我想出了一个使用ListView的ItemTemplateSelector属性来定义几个不同的项目模板。
I played with it for a bit and this is what I came up with that uses ListView's ItemTemplateSelector property to define a few different item templates.
<Page
x:Class="App82.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:App82"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<Page.Resources>
<local:CollapsibleListItemTemplateSelector
x:Key="collapsibleListItemTemplateSelector">
<local:CollapsibleListItemTemplateSelector.BasicItemTemplate>
<DataTemplate>
<Border
Margin="5"
Height="50"
VerticalAlignment="Stretch"
BorderBrush="ForestGreen"
BorderThickness="2,0,0,0">
<StackPanel
Margin="10,0,0,0">
<TextBlock
FontWeight="Bold"
Text="{Binding Title}" />
<TextBlock
Text="{Binding Gist}" />
</StackPanel>
</Border>
</DataTemplate>
</local:CollapsibleListItemTemplateSelector.BasicItemTemplate>
<local:CollapsibleListItemTemplateSelector.ExpandedItemTemplate>
<DataTemplate>
<Border
Margin="15,5,5,5"
Height="50"
VerticalAlignment="Stretch"
BorderBrush="Yellow"
BorderThickness="2,0,0,0">
<StackPanel
Margin="10,0,0,0">
<TextBlock
FontWeight="Bold"
Text="{Binding Title}" />
<TextBlock
Text="{Binding Gist}" />
</StackPanel>
</Border>
</DataTemplate>
</local:CollapsibleListItemTemplateSelector.ExpandedItemTemplate>
<local:CollapsibleListItemTemplateSelector.CollapsibleItemTemplate>
<DataTemplate>
<Border
Margin="5"
Height="50"
VerticalAlignment="Stretch"
BorderBrush="DodgerBlue"
BorderThickness="2,0,0,0">
<StackPanel
Margin="10,0,0,0"
Orientation="Horizontal">
<TextBlock
FontWeight="Bold"
Text="{Binding ChildItems.Count}" />
<TextBlock
FontWeight="Bold"
Text=" Items" />
</StackPanel>
</Border>
</DataTemplate>
</local:CollapsibleListItemTemplateSelector.CollapsibleItemTemplate>
</local:CollapsibleListItemTemplateSelector>
</Page.Resources>
<Grid
Background="{StaticResource ApplicationPageBackgroundThemeBrush}">
<ListView
x:Name="ListView"
ItemTemplateSelector="{StaticResource collapsibleListItemTemplateSelector}"
ItemClick="OnItemClick"
IsItemClickEnabled="True" />
</Grid>
</Page>
后面的代码：
Code behind:
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using App82.Common;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
namespace App82
{
public sealed partial class MainPage : Page
{
public MainPage()
{
this.InitializeComponent();
var items = new ObservableCollection<BindableBase>();
var item1 = new BasicItem { Title = "Item 1", Gist = "This item has some content that is not fully shown..." };
var item2 = new ExpandedItem { Title = "Item 2", Gist = "This item has some content that is not fully shown..." };
var item3 = new ExpandedItem { Title = "Item 3", Gist = "This item has some content that is not fully shown..." };
var item4 = new ExpandedItem { Title = "Item 4", Gist = "This item has some content that is not fully shown..." };
var item5 = new BasicItem { Title = "Item 5", Gist = "This item has some content that is not fully shown..." };
var itemGroup1 = new CollapsibleItem(items, new[] { item2, item3, item4 });
items.Add(item1);
items.Add(itemGroup1);
items.Add(item5);
this.ListView.ItemsSource = items;
}
private void OnItemClick(object sender, ItemClickEventArgs e)
{
var collapsibleItem = e.ClickedItem as CollapsibleItem;
if (collapsibleItem != null)
collapsibleItem.ToggleCollapse();
}
}
public class CollapsibleListItemTemplateSelector : DataTemplateSelector
{
public DataTemplate BasicItemTemplate { get; set; }
public DataTemplate CollapsibleItemTemplate { get; set; }
public DataTemplate ExpandedItemTemplate { get; set; }
protected override Windows.UI.Xaml.DataTemplate SelectTemplateCore(object item, Windows.UI.Xaml.DependencyObject container)
{
if (item is ExpandedItem)
return ExpandedItemTemplate;
if (item is BasicItem)
return BasicItemTemplate;
//if (item is CollapsibleItem)
return CollapsibleItemTemplate;
}
}
public class BasicItem : BindableBase
{
#region Title
private string _title;
public string Title
{
get { return _title; }
set { this.SetProperty(ref _title, value); }
}
#endregion
#region Gist
private string _gist;
public string Gist
{
get { return _gist; }
set { this.SetProperty(ref _gist, value); }
}
#endregion
}
public class ExpandedItem : BasicItem
{
}
public class CollapsibleItem : BindableBase
{
private readonly IList _hostCollection;
#region IsExpanded
private bool _isExpanded;
public bool IsExpanded
{
get { return _isExpanded; }
set
{
if (this.SetProperty(ref _isExpanded, value))
{
if (_isExpanded)
Expand();
else
Collapse();
}
}
}
#endregion
#region ChildItems
private ObservableCollection<BasicItem> _childItems;
public ObservableCollection<BasicItem> ChildItems
{
get { return _childItems; }
set { this.SetProperty(ref _childItems, value); }
}
#endregion
public CollapsibleItem(
IList hostCollection,
IEnumerable<BasicItem> childItems)
{
_hostCollection = hostCollection;
_childItems = new ObservableCollection<BasicItem>(childItems);
}
public void ToggleCollapse()
{
IsExpanded = !IsExpanded;
}
private void Expand()
{
int i = _hostCollection.IndexOf(this) + 1;
foreach (var childItem in ChildItems)
{
_hostCollection.Insert(i++, childItem);
}
}
private void Collapse()
{
int i = _hostCollection.IndexOf(this) + 1;
for (int index = 0; index < ChildItems.Count; index++)
{
_hostCollection.RemoveAt(i);
}
}
}
}
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