稳扎稳打Silverlight(35) 3.0控件之ChildWindow, SaveFileDialog, HeaderedItemsControl, VirtualizingStackPanel

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稳扎稳打Silverlight(35) - 3.0控件之ChildWindow, SaveFileDialog, HeaderedItemsControl, VirtualizingStackPanel

作者：webabcd


介绍
Silverlight 3.0 控件一览：

• ChildWindow - 用于在父窗体前弹出一个的子窗体
• SaveFileDialog - 用户发起的保存文件对话框（OpenFileDialog - 打开文件对话框）
• HeaderedItemsControl - 呈现标题和集合数据的控件
• VirtualizingStackPanel - 虚拟化的 StackPanel（即仅生成需要显示的 UI 元素。当绑定了大量数据，而某时仅显示其中一小部分的时候，使用此控件则可大幅提高呈现效率） 

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


示例
1、演示 ChildWindow 的应用
ChildWindowDemo.xaml

<navigation:Page x:Class="Silverlight30.Control.ChildWindowDemo" 
           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="ChildWindowDemo Page">
    <Grid x:Name="LayoutRoot">
        <StackPanel>

            <Button x:Name="btnChildWindow" Content="Show ChildWindow" Click="btnChildWindow_Click" />
            <Button x:Name="btnCustomChildWindow" Content="Show CustomChildWindow" Click="btnCustomChildWindow_Click" />
    
            <TextBlock x:Name="lblResult" />
            
        </StackPanel>
    </Grid>
</navigation:Page>

 
ChildWindowDemo.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 ChildWindowDemo : Page
    {
        public ChildWindowDemo()
        {
            InitializeComponent();
        }

        private void btnChildWindow_Click(object sender, RoutedEventArgs e)
        {
            /**//*
             * ChildWindow - 在父窗体前显示的子窗体
             *     Title - 子窗体的标题
             *     Content - 子窗体的内容
             *     HasCloseButton - 子窗体上是否要有关闭按钮（右上角的 ×）
             *     OverlayBrush - 子窗体打开后，覆盖在父窗体上的 Brush
             *     OverlayOpacity - 子窗体打开后，覆盖在父窗体上的 Brush 的不透明度
             *     Width - 子窗体的宽
             *     Height - 子窗体的高
             *     Closed事件 - 子窗体关闭后所触发的事件
             *     Show() - 打开（显示）子窗体
             */

            ChildWindow child = new ChildWindow();
            child.Title = "标题";
            child.Content = "内容";
            child.HasCloseButton = true;
            child.OverlayBrush = new SolidColorBrush(Colors.Red);
            child.OverlayOpacity = 0.3;
            child.Width = 320;
            child.Height = 240;
            
            child.Show();
        }

        void child_Closed(object sender, EventArgs e)
        {
            /**//*
             * ChildWindow.DialogResult - 子窗体传递回来的一个 bool? 值（可以用来描述在子窗体中是单击了“确定”按钮还是“取消”按钮）
             * ChildWindow.DataContext - 子窗体传递回来的数据上下文
             */

            CustomChildWindow child = sender as CustomChildWindow;
            MessageBox.Show(string.Format("DialogResult:{0}; DataContext:{1}", child.DialogResult, child.DataContext));
        }

        private void btnCustomChildWindow_Click(object sender, RoutedEventArgs e)
        {
            CustomChildWindow child = new CustomChildWindow();
            child.Closed += new EventHandler(child_Closed);
            child.Show();
        }
    }
}

CustomChildWindow.xaml（自定义子窗体）

<controls:ChildWindow x:Class="Silverlight30.Control.CustomChildWindow"
           xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
           xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
           xmlns:controls="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls"
           Width="320" Height="240" 
           Title="我是标题">
    <Grid x:Name="LayoutRoot" Margin="2">
        <Grid.RowDefinitions>
            <RowDefinition />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>

        <Button x:Name="CancelButton" Content="Cancel" Click="CancelButton_Click" Width="75" Height="23" HorizontalAlignment="Right" Margin="0,12,0,0" Grid.Row="1" />
        <Button x:Name="OKButton" Content="OK" Click="OKButton_Click" Width="75" Height="23" HorizontalAlignment="Right" Margin="0,12,79,0" Grid.Row="1" />
    </Grid>
</controls:ChildWindow>

CustomChildWindow.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;

namespace Silverlight30.Control
{
    public partial class CustomChildWindow : System.Windows.Controls.ChildWindow
    {
        public CustomChildWindow()
        {
            InitializeComponent();
        }

        private void OKButton_Click(object sender, RoutedEventArgs e)
        {
            /**//*
             * ChildWindow.DialogResult - 传递给父窗体的一个 bool? 值（可以用来描述在子窗体中是单击了“确定”按钮还是“取消”按钮）
             * ChildWindow.DataContext - 传递给父窗体的数据上下文
             */

            this.DataContext = "点击了 OK 按钮";
            this.DialogResult = true;
        }

        private void CancelButton_Click(object sender, RoutedEventArgs e)
        {
            this.DataContext = "点击了 Cancel 按钮";
            this.DialogResult = false;
        }
    }
}

2、SaveFileDialog 和 OpenFileDialog 的演示
SaveFileDialogDemo.xaml

<navigation:Page x:Class="Silverlight30.Control.SaveFileDialogDemo" 
           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="SaveFileDialog Page">
    <Grid x:Name="LayoutRoot">
        <StackPanel>
        
            <TextBox x:Name="txtInfo" />
            <Button x:Name="btnSave" Content="保存" Click="btnSave_Click" />
            <Button x:Name="btnLoad" Content="载入" Click="btnLoad_Click" />
            
        </StackPanel>
    </Grid>
</navigation:Page>

SaveFileDialogDemo.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.IO;
using System.Text;

namespace Silverlight30.Control
{
    public partial class SaveFileDialogDemo : Page
    {
        public SaveFileDialogDemo()
        {
            InitializeComponent();
        }

        private void btnSave_Click(object sender, RoutedEventArgs e)
        {
            /**//*
             * SaveFileDialog - 用户发起的保存文件对话框
             *     Filter - 指定保存文件的描述信息及文件类型（出现在对话框的“保存类型”下拉列表中）
             *     DefaultExt - 当指定保存文件类型为 *.* 时的默认扩展名
             *     FilterIndex - 默认的保存类型在 Filter 中的索引（注意：索引从 1 开始）
             *     ShowDialog() - 显示保存文件对话框。用户在对话框中单击“保存”则返回 true；单击“取消”或关闭对话框则返回 false
             *     OpenFile() - 打开用户选择的文件，并返回文件流
             */

            SaveFileDialog dialog = new SaveFileDialog();
            dialog.Filter = "Text Files|*.txt|Log Files|*.log|All Files|*.*";
            dialog.FilterIndex = 1;

            bool? result = dialog.ShowDialog();
            if (result == true)
            {
                using (Stream stream = dialog.OpenFile())
                {
                    byte[] info = Encoding.UTF8.GetBytes(txtInfo.Text);
                    stream.Write(info, 0, info.Length);
                }

                txtInfo.Text = "";
            }
        }

        private void btnLoad_Click(object sender, RoutedEventArgs e)
        {
            /**//*
             * OpenFileDialog - 打开文件对话框
             *     Filter - 同 SaveFileDialog
             *     FilterIndex - 同 SaveFileDialog
             *     ShowDialog() - 显示打开文件对话框。用户在对话框中单击“打开”则返回 true；单击“取消”或关闭对话框则返回 false
             *     File - 返回用户所选择文件的的 FileInfo 对象
             *     Multiselect - 选择文件时可否多选
             *     Files - 返回用户所选择文件的的 FileInfo 对象集合
             */

            OpenFileDialog dialog = new OpenFileDialog();
            dialog.Filter = "Text Files|*.txt";
            
            if (dialog.ShowDialog() == true)
            {
                using (FileStream fs = dialog.File.OpenRead())
                {
                    byte[] buffer = new byte[fs.Length];
                    fs.Read(buffer, 0, buffer.Length);

                    txtInfo.Text = Encoding.UTF8.GetString(buffer, 0, buffer.Length);
                }
            }
        }
    }
}

3、演示 HeaderedItemsControl 的使用
HeaderedItemsControl.xaml

<navigation:Page xmlns:controls="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls"  x:Class="Silverlight30.Control.HeaderedItemsControl" 
           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="HeaderedItemsControl Page">
    <Grid x:Name="LayoutRoot">
    
        <!--
            HeaderedItemsControl - 呈现标题和集合数据的控件
            HeaderedItemsControl.Header, HeaderedItemsControl.HeaderTemplate - 用于显示标题
            HeaderedItemsControl.Items, HeaderedItemsControl.ItemTemplate - 用于显示集合数据
        -->
    
        <controls:HeaderedItemsControl x:Name="headeredItemsControl" >
            <controls:HeaderedItemsControl.Header>
                <TextBlock Text="Header" />
            </controls:HeaderedItemsControl.Header>
            <controls:HeaderedItemsControl.ItemTemplate>
                <DataTemplate>
                    <TextBlock Text="{Binding}" />
                </DataTemplate>
            </controls:HeaderedItemsControl.ItemTemplate>
        </controls:HeaderedItemsControl>
        
    </Grid>
</navigation:Page>

HeaderedItemsControl.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 HeaderedItemsControl : Page
    {
        public HeaderedItemsControl()
        {
            InitializeComponent();

            this.Loaded += new RoutedEventHandler(HeaderedItemsControl_Loaded);
        }

        void HeaderedItemsControl_Loaded(object sender, RoutedEventArgs e)
        {
            List<string> items = new List<string>();
            for (int i = 0; i < 5; i++)
            {
                items.Add(i.ToString().PadLeft(10, '0'));
            }

            headeredItemsControl.ItemsSource = items;
        }
    }
}

4、演示 VirtualizingStackPanel 的应用
VirtualizingStackPanel.xaml

<navigation:Page x:Class="Silverlight30.Control.VirtualizingStackPanel" 
           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="VirtualizingStackPanel Page">
    <Grid x:Name="LayoutRoot">
    
        <ListBox x:Name="listBox" VerticalAlignment="Top" HorizontalAlignment="Left" 
            Height="50" Width="300">
            <ListBox.ItemsPanel>
                <ItemsPanelTemplate>
                    <!--
                        VirtualizingStackPanel - 虚拟化的 StackPanel（即仅生成需要显示的 UI 元素。当绑定了大量数据，而某时仅显示其中一小部分的时候，使用此控件则可大幅提高呈现效率）
                        Orientation - 数据的排列方式（垂直排列或水平排列）
                    -->
                    <VirtualizingStackPanel Orientation="Horizontal" />
                </ItemsPanelTemplate>
            </ListBox.ItemsPanel>
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <TextBlock Text="{Binding}" />
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
        
    </Grid>
</navigation:Page>

VirtualizingStackPanel.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 VirtualizingStackPanel : Page
    {
        public VirtualizingStackPanel()
        {
            InitializeComponent();

            this.Loaded += new RoutedEventHandler(VirtualizingStackPanel_Loaded);
        }

        void VirtualizingStackPanel_Loaded(object sender, RoutedEventArgs e)
        {
            List<string> items = new List<string>();
            for (int i = 0; i < 3000; i++)
            {
                items.Add(i.ToString().PadLeft(10, '0'));
            }

            listBox.ItemsSource = items;
        }
    }
}

OK
[源码下载]