稳扎稳打Silverlight(33) - 3.0控件之AutoCompleteBox, DataPager

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稳扎稳打Silverlight(33) - 3.0控件之autocompletebox,DataPager

作者：webabcd


介绍
Silverlight 3.0 控件一览：

• autocompletebox - 自动完成控件。当用户输入部分信息后，此控件可以基于指定的过滤算法在一个下拉框中陈列出匹配项
• DataPager - 分页控件 

在线DEMO
http://www.voidcn.com/article/p-boakcggz-tq.html  


示例
1、演示 autocompletebox（一次绑定全部数据或按需加载相关数据）
autocompletebox.xaml

<navigation:Page xmlns:input="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Input"    x:Class="Silverlight30.Control.autocompletebox"    
                     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="autocompletebox Page">
        <Grid x:Name="LayoutRoot">
                
                <Grid.Resources>
                        <!--用于在 autocompletebox 中显示数据的模板-->
                        <DataTemplate x:Key="dataTemplate">
                                <StackPanel Orientation="Horizontal">
                                        <TextBlock Text="名字: " />
                                        <TextBlock Text="{Binding Name}" />
                                        <TextBlock Text="薪水: " />
                                        <TextBlock Text="{Binding Salary}" />
                                </StackPanel>
                        </DataTemplate>
                </Grid.Resources>

                <StackPanel Orientation="Horizontal" VerticalAlignment="Top">
                        
                        <!--
                                MinimumPrefixLength - 如需显示自动完成的匹配项，所需输入的最少字符数
                                IsTextCompletionEnabled - 是否在 Text 中显示当前匹配项的全部内容
                                MaxDropDownHeight - 下拉框的最大长度
                                FilterMode - 根据用户的输入，对数据源做过滤的方式，默认值：StartsWith [System.Windows.Controls.AutoCompleteFilterMode 枚举]
                                        本例演示如何实现自定义的过滤
                                DropDownopening,DropDownopened,DropDownClosing,DropDownClosed - 顾名思义的几个事件
                        -->
                        <input:autocompletebox x:Name="autocompletebox" Width="100" Height="30" Margin="10"
                                                                     MinimumPrefixLength="0" IsTextCompletionEnabled="True" MaxDropDownHeight="100"
                                                                     FilterMode="Custom">
                                <!--
                                        呈现数据的方式如下，也可以设置 autocompletebox 的 ValueMemberBinding 属性
                                -->
                                <input:autocompletebox.ItemTemplate>
                                        <DataTemplate>
                                                <StackPanel>
                                                        <TextBlock Text="{Binding}" />
                                                </StackPanel>
                                        </DataTemplate>
                                </input:autocompletebox.ItemTemplate>
                        </input:autocompletebox>

                        
                        <!--
                                ValueMemberPath - 在此属性指定的成员中做过滤，过滤参数为用户的输入
                                ItemTemplate - 指定用于显示数据的模板
                        -->
                        <input:autocompletebox x:Name="autocompleteboxTemplate" Width="100" Height="30" Margin="10"
                                                                     ValueMemberPath="Salary"
                                                                     ItemTemplate="{StaticResource dataTemplate}" />

                        
                        <!--
                                Populating,Populated - 调用 按需加载数据服务 的一对事件
                                MinimumPopulateDelay - 调用 按需加载数据服务 的延迟时间。即在用户的输入发生改变时，此时间后调用指定的服务
                        -->
                        <input:autocompletebox x:Name="autocompleteboxPopulate" Width="100" Height="30" Margin="10"    
                                                                     Populating="autocompleteboxPopulate_Populating"
                                                                     MinimumPopulateDelay="500">
                                <input:autocompletebox.ItemTemplate>
                                        <DataTemplate>
                                                <StackPanel>
                                                        <TextBlock Text="{Binding}" />
                                                </StackPanel>
                                        </DataTemplate>
                                </input:autocompletebox.ItemTemplate>
                        </input:autocompletebox>
                        
                </StackPanel>
        </Grid>
</navigation:Page>

 

EmployeeModel.cs

using System;

using System.Net;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Documents;

using System.Windows.Ink;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Animation;

using System.Windows.Shapes;

namespace Silverlight30.Model

{

         public class EmployeeModel

        {

                 public string Name { get; set; }

                 public double Salary { get; set; }

                 public DateTime DateOfBirty { get; set; }

        }

}

 

autocompletebox.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 Silverlight30.Model;

using System.Xml.Linq;

namespace Silverlight30.Control

{

         public partial class autocompletebox : Page

        {

                 public autocompletebox()

                {

                        InitializeComponent();

                         this.Loaded += new RoutedEventHandler(autocompletebox_Loaded);

                }

                 void autocompletebox_Loaded( object sender,RoutedEventArgs e)

                {

                        Init();

                        Init2();

                }

                 private void Init()

                {

                         // IsDropDownopen - 是否显示自定完成的下拉框

                        autocompletebox.GotFocus += delegate { autocompletebox.IsDropDownopen = true; };

                        autocompletebox.Focus();

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

                        collection.Add( "aabb");

                        collection.Add( "aabc");

                        collection.Add( "abcc");

                        collection.Add( "abbc");

                        collection.Add( "aaab");

                        collection.Add( "bcca");

                        collection.Add( "bbac");

                        collection.Add( "cbaa");

                        collection.Add( "ccaa");

                        collection.Add( "cccb");

                        collection.Add( "cccc");

                        collection.Add( "cabc");

                        collection.Add( "cabb");

                        autocompletebox.ItemsSource = collection;

                         /*

                         * ItemFilter - 过滤下拉框内的对象

                         * TextFilter - 过滤下拉框内的字符串

                         * SearchText - 以此值为参数，过滤下拉框中的数据

                         * SelectedItem - 下拉框当前所选中的对象

                         */

                         // 自定义 FilterMode

                         // 第一个参数：用户输入的值；第二个参数：下拉框中的对象

                        autocompletebox.ItemFilter += (search,value) =>

                        {

                                 if (value.ToString().ToLower().StartsWith(search.ToLower()) || value.ToString().ToLower().EndsWith(search.ToLower()))

                                         return true;

                                 return false;

                        };

                }

                 private void Init2()

                {

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

                        employees.Add( new EmployeeModel { Name = "aabb",DateOfBirty = DateTime.Now,Salary = 111 });

                        employees.Add( new EmployeeModel { Name = "aabc",Salary = 112 });

                        employees.Add( new EmployeeModel { Name = "abcc",Salary = 113 });

                        employees.Add( new EmployeeModel { Name = "abbc",Salary = 114 });

                        employees.Add( new EmployeeModel { Name = "aaab",Salary = 115 });

                        employees.Add( new EmployeeModel { Name = "bcca",Salary = 116 });

                        employees.Add( new EmployeeModel { Name = "bbac",Salary = 117 });

                        employees.Add( new EmployeeModel { Name = "cbaa",Salary = 118 });

                        employees.Add( new EmployeeModel { Name = "ccaa",Salary = 119 });

                        employees.Add( new EmployeeModel { Name = "cccb",Salary = 1111 });

                        employees.Add( new EmployeeModel { Name = "cccc",Salary = 1112 });

                        employees.Add( new EmployeeModel { Name = "cabc",Salary = 1113 });

                        employees.Add( new EmployeeModel { Name = "cabb",Salary = 1114 });

                        autocompleteboxTemplate.ItemsSource = employees;

                }

                 /// <summary>

                 /// 演示如何实现按需加载下拉框的数据

                 /// </summary>

                 private void autocompleteboxPopulate_Populating( object sender,PopulatingEventArgs e)

                {

                         // Populate 是异步的，调用服务也是异步的

                         // 所以要先在 Populating 中 Cancel 掉 Populate，以便异步调用服务

                         // 服务返回结果后再调用 PopulateComplete() 方法，以便触发 Populated 事件

                        e.Cancel = true;

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

                        Uri uri = new Uri( "http://localhost:8616/Employee.svc/names/" + e.Parameter,UriKind.Absolute);

                        WebClient client = new WebClient();

                        client.DownloadStringCompleted += (s,args) =>

                        {

                                if (args.Error != null)

                                {

                                        MessageBox.Show("调用服务出错" + args.Error.ToString());

                                        return;

                                }

                                XDocument xml = XDocument.Parse(args.Result);

                                XNamespace ns = "http://schemas.microsoft.com/2003/10/Serialization/Arrays";

                                autocompleteboxPopulate.ItemsSource = xml.Root.Elements(ns + "string").Select(p => p.Value).ToList();

                                autocompleteboxPopulate.PopulateComplete();

                        };

                        client.DownloadStringAsync(uri);

                }

        }

}

 

2、演示 DataPager
DataPager.xaml

<navigation:Page xmlns:data="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data"    x:Class="Silverlight30.Control.DataPager"    
                     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="DataPager Page">
        <Grid x:Name="LayoutRoot">
                <StackPanel>
                        
                        <!--
                                PageSize - 页大小
                                NumericButtonCount - 数字分页按钮的数量
                                AutoEllipsis - 当页总数大于分页按钮的数量时，是否自动显示省略号
                                IsTotalItemCountFixed - 数据量是否是不变的（即是否没有对当前绑定数据的添加/删除操作）
                                displayMode - 分页控件的显示模式 [System.Windows.Controls.Data.PagerdisplayMode 枚举]
                        -->
                        <StackPanel Margin="10" >
                                <data:DataPager x:Name="dataPager"
                                                        PageSize="6" NumericButtonCount="10" AutoEllipsis="True"
                                                        displayMode="FirstLastPrevIoUsNext"    
                                                        IsTotalItemCountFixed="True">
                                </data:DataPager>
                                <ListBox x:Name="listBox" />
                                <data:DataPager x:Name="dataPager2"
                                                        PageSize="6" NumericButtonCount="10" AutoEllipsis="True"
                                                        displayMode="FirstLastPrevIoUsNextNumeric"    
                                                        IsTotalItemCountFixed="True">
                                </data:DataPager>
                        </StackPanel>

                </StackPanel>
        </Grid>
</navigation:Page>

 

DataPager.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.Windows.Data;

using System.Xml.Linq;

namespace Silverlight30.Control

{

         public partial class DataPager : Page

        {

                 public DataPager()

                {

                        InitializeComponent();

                         this.Loaded += new RoutedEventHandler(DataPager_Loaded);

                }

                 void DataPager_Loaded( object sender,RoutedEventArgs e)

                {

                        Init();

                }

                 void Init()

                {

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

                         for ( int i = 0; i < 100; i++)

                        {

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

                        }

                         // PagedCollectionView - 使一个 IEnumerable 集合具有分页功能

                        PagedCollectionView view = new PagedCollectionView(items);

                         // 设置 DataPager 的 Source 属性 和 对应的显示数据的控件的 ItemsSource 属性 为同一个 PagedCollectionView 对象

                        dataPager.source = view;

                        dataPager2.source = view;

                        listBox.ItemsSource = view;

                }

        }

}

 

 

OK
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