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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://webabcd.blog.51cto.com/1787395/342289

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;
                }
        }
}