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

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[align=center]稳扎稳打Silverlight(35) - 3.0控件之ChildWindow, SaveFileDialog, HeaderedItemsControl, VirtualizingStackPanel[/align]

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;


        }


    }


}



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