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"  Grid.Row ="1"   />

         < Button  x:Name ="OKButton"  Content ="OK"  Click ="OKButton_Click"  Width ="75"  Height ="23"  HorizontalAlignment ="Right"  Margin ="0,79,0"  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, buffer.Length);

                    txtInfo.Text = Encoding.UTF8.GetString(buffer, 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]