稳扎稳打Silverlight(36) 3.0控件之TreeView, ListBox增强, DataGrid增强, MediaElement增强

[索引页]
[源码下载]

稳扎稳打Silverlight(36) - 3.0控件之TreeView, ListBox增强, DataGrid增强, MediaElement增强

作者：webabcd

介绍
Silverlight 3.0 控件一览：

TreeView - 树控件
ListBox - 改进：支持多选
DataGrid - 改进：结合 PagedCollectionView 实现数据分组, 增加了一些编辑数据的相关事件, 结合 DataAnnotations 实现数据验证, 等。。。
MediaElement - 增加了对视频 H.264 编码格式的支持，和对音频 AAC 编码格式的支持

在线DEMO
http://www.cnblogs.com/webabcd/archive/2009/08/04/1538238.html

示例
1、演示 TreeView 的使用
TreeView.xml（数据源）

<?xml version="1.0" encoding="utf-8" ?>

<root>

</node>

</node>

</node>

</node>

</root>

TreeView.xaml

<navigation:Page x:Class="Silverlight30.Control.TreeView"

xmlns:controls="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls"

xmlns:common="clr-namespace:System.Windows;assembly=System.Windows.Controls"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

mc:Ignorable="d"

xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"

d:DesignWidth="640" d:DesignHeight="480"

Title="TreeView Page">

<StackPanel.Resources>

<!--

HierarchicalDataTemplate - 呈现层级数据的数据模板

ItemsSource - 指定下一级数据的数据源

ItemTemplate - 指定下一级数据的数据模板

-->

<common:HierarchicalDataTemplate x:Key="childTemplate"

ItemsSource="{Binding Path=Children}">

</StackPanel>

</common:HierarchicalDataTemplate>

<common:HierarchicalDataTemplate x:Key="treeTemplate"

ItemsSource="{Binding Path=Children}"

ItemTemplate="{StaticResource childTemplate}">

</common:HierarchicalDataTemplate>

</StackPanel.Resources>

<!--

ItemsSource - 数据源

ItemTemplate - 指定层级显示数据的模板

-->

<controls:TreeView x:Name="treeView" Margin="5"

ItemsSource="{Binding}"

ItemTemplate="{StaticResource treeTemplate}"

SelectedItemChanged="treeView_SelectedItemChanged">

</controls:TreeView>

<!--

TreeViewItem - TreeView 的项

Header - 项的标题

HeaderTemplate - 项的标题模板

-->

<controls:TreeView x:Name="treeView2" Margin="5">

<controls:TreeViewItem Header="level 1">

<controls:TreeViewItem Header="level 2">

<controls:TreeViewItem>

<controls:TreeViewItem.HeaderTemplate>

</DataTemplate>

</controls:TreeViewItem.HeaderTemplate>

</controls:TreeViewItem>

</controls:TreeView>

</StackPanel>

</Grid>

</navigation:Page>

TreeView.xaml.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Net;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Animation;

using System.Windows.Shapes;

using System.Windows.Navigation;

using System.Xml.Linq;

using Silverlight30.Model;

namespace Silverlight30.Control

{

public partial class TreeView : Page

{

public TreeView()

{

InitializeComponent();

this.Loaded += new RoutedEventHandler(TreeView_Loaded);

}

void TreeView_Loaded(object sender, RoutedEventArgs e)

{

XElement root = XElement.Load("Control/TreeView.xml");

// 构造带层级关系的数据源（递归方式）

var result = LoadData(root);

treeView.DataContext = result;

}

private List<TreeViewModel> LoadData(XElement root)

{

if (root == null)

return null;

var items = from n in root.Elements("node")

select new TreeViewModel

{

Title = (string)n.Attribute("name"),

Children = LoadData(n)

};

return items.ToList();

}

private void treeView_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)

{

MessageBox.Show(((TreeViewModel)e.NewValue).Title);

}

2、演示 ListBox 增加的一个功能：多选
ListBox.xaml

<navigation:Page x:Class="Silverlight30.Control.ListBox"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

mc:Ignorable="d"

xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"

d:DesignWidth="640" d:DesignHeight="480"

Title="ListBox Page">

<!--

ListBox - 新增特性：可以多选

SelectionMode - 选择模式 [System.Windows.Controls.SelectionMode 枚举]

Single - 只允许单选

Multiple - 可以多选（不需要任何辅助键）

Extended - 可以多选（需要 Ctrl 或 Shift 的配合）

-->

<ListBox.ItemTemplate>

</StackPanel>

</DataTemplate>

</ListBox.ItemTemplate>

</ListBox>

</StackPanel>

</Grid>

</navigation:Page>

ListBox.xaml.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Net;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Animation;

using System.Windows.Shapes;

using System.Windows.Navigation;

namespace Silverlight30.Control

{

public partial class ListBox : Page

{

public ListBox()

{

InitializeComponent();

this.Loaded += new RoutedEventHandler(ListBox_Loaded);

}

void ListBox_Loaded(object sender, RoutedEventArgs e)

{

List<string> items = new List<string>();

for (int i = 0; i < 30; i++)

{

items.Add(i.ToString().PadLeft(10, '0'));

}

listBox.ItemsSource = items;

}

private void Button_Click(object sender, RoutedEventArgs e)

{

lblResult.Text = "";

// ListBox.SelectedItems - 选中的对象集合

foreach (string s in listBox.SelectedItems)

{

lblResult.Text += s + "\r\n";

}

3、演示 DataGrid 的几个新增的功能
DataGrid.xaml

<navigation:Page xmlns:data="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data" x:Class="Silverlight30.Control.DataGrid"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

mc:Ignorable="d"

xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"

d:DesignWidth="640" d:DesignHeight="480"

Title="DataGrid Page">

<!--

新增功能：结合 PagedCollectionView 实现数据分组；增加了一些编辑数据的相关事件；结合 DataAnnotations 实现数据验证

-->

<data:DataGrid x:Name="dataGrid" AutoGenerateColumns="False">

<data:DataGrid.Columns>

<data:DataGridTextColumn Binding="{Binding Name}" Header="名字" />

<data:DataGridTextColumn Binding="{Binding DateOfBirth}" Header="生日" />

</data:DataGrid.Columns>

</data:DataGrid>

</Grid>

</navigation:Page>

DataGrid.xaml.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Net;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Animation;

using System.Windows.Shapes;

using System.Windows.Navigation;

using System.Xml.Linq;

using Silverlight30.Model;

using System.Windows.Data;

namespace Silverlight30.Control

{

public partial class DataGrid : Page

{

public DataGrid()

{

InitializeComponent();

this.Loaded += new RoutedEventHandler(DataGrid_Loaded);

}

void DataGrid_Loaded(object sender, RoutedEventArgs e)

{

List<EmployeeModel> employees = new List<EmployeeModel>();

employees.Add(new EmployeeModel { Name = "aabb", DateOfBirth = DateTime.Now, Salary = 1111 });

employees.Add(new EmployeeModel { Name = "aabc", DateOfBirth = DateTime.Now, Salary = 1111 });

employees.Add(new EmployeeModel { Name = "abcc", DateOfBirth = DateTime.Now, Salary = 1122 });

employees.Add(new EmployeeModel { Name = "abbc", DateOfBirth = DateTime.Now, Salary = 1122 });

employees.Add(new EmployeeModel { Name = "aaab", DateOfBirth = DateTime.Now, Salary = 1122 });

employees.Add(new EmployeeModel { Name = "bcca", DateOfBirth = DateTime.Now, Salary = 1122 });

employees.Add(new EmployeeModel { Name = "bbac", DateOfBirth = DateTime.Now, Salary = 1133 });

employees.Add(new EmployeeModel { Name = "cbaa", DateOfBirth = DateTime.Now, Salary = 1133 });

employees.Add(new EmployeeModel { Name = "ccaa", DateOfBirth = DateTime.Now, Salary = 1133 });

employees.Add(new EmployeeModel { Name = "cccb", DateOfBirth = DateTime.Now, Salary = 1144 });

employees.Add(new EmployeeModel { Name = "cccc", DateOfBirth = DateTime.Now, Salary = 1155 });

employees.Add(new EmployeeModel { Name = "cabc", DateOfBirth = DateTime.Now, Salary = 1155 });

employees.Add(new EmployeeModel { Name = "cabb", DateOfBirth = DateTime.Now, Salary = 1166 });

// 通过 PagedCollectionView 的 GroupDescriptions 设置需要分组的字段，绑定到 DataGrid 后，DataGrid会自动对数据做分组显示

PagedCollectionView view = new PagedCollectionView(employees);

view.GroupDescriptions.Add(new PropertyGroupDescription("Salary"));

dataGrid.ItemsSource = view;

}

4、演示 MediaElement 的增强点：以 H.264 编码，MP4为容器做演示
MediaElement.xaml

<navigation:Page x:Class="Silverlight30.Control.MediaElement"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

mc:Ignorable="d"

xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"

d:DesignWidth="640" d:DesignHeight="480"

Title="MediaElement Page">

<!--

增加了对视频 H.264 编码格式的支持，和对音频 AAC 编码格式的支持

本例以 H.264 编码，MP4为容器做演示

-->

<MediaElement x:Name="mediaElement" Source="/Resource/Demo.mp4" Width="320" Height="240"

AutoPlay="True" MediaEnded="mediaElement_MediaEnded" />

</Grid>

</navigation:Page>

MediaElement.xaml.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Net;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Animation;

using System.Windows.Shapes;

using System.Windows.Navigation;

namespace Silverlight30.Control

{

public partial class MediaElement : Page

{

public MediaElement()

{

InitializeComponent();

}

private void mediaElement_MediaEnded(object sender, RoutedEventArgs e)

{

// 重播

mediaElement.Stop();

mediaElement.Play();

}

OK
[源码下载]