AutoCompleteBox(下文简称ACB)控件就像谷歌的搜索框,可以帮助使用者找到相似的查询项(图1),本篇将介绍下面Demo 演示中涉及到一些属性和实例。如果使用Blend 在安装好Toolkit 后会在Assets 菜单中出现ACB 控件(图2),在VS 中需要增加Reference:Microsoft.Windows.Controls.dll 和 System.Windows.Controls 命名空间,即可使用该控件。
图1
图2
Demo 演示:
MinimumPopulateDelay 该属性以毫秒为计时单位(默认值为0),用于延迟ACB 响应时间,在输入文字后n秒才会显示匹配信息。
MinimumPrefixLength 用于调整最少录入字符数(默认值为1),在输入n个字符后ACB 开始对数据进行匹配。
IsTextCompletionEnabled 该属性设为True后会对输入的信息进行匹配,并将“第一个”最符合项自动填入输入框中(如下对比图)。
False
True
FilterMode 用于调整搜索的匹配模式(默认为StartsWith),相关模式如下:
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ItemsSource 是一个IEnumerable 用于为控件填充数据,Demo 中第一个ACB 的数据:
autoCompleteBox.ItemsSource = new string[]
{
"Microsoft Windows 7",
"Microsoft Expression Blend",
"Microsoft Silverlight",
"Silverlight Toolkit",
"Silverlight SDK"
};
ItemTemplate 可为ACB 自定义显示样式(Demo 中第二个ACB 效果),用于这次为ACB 同时填充了3组数据:ID、产品名称、公司名称,所以需要通过ValueMemberPath 告知ACB 以那组数据进行匹配:
<input:AutoCompleteBox x:Name="autoCompleteBoxWithStyle" FilterMode="Contains" ValueMemberPath="ProductName">
<input:AutoCompleteBox.ItemTemplate>
<DataTemplate>
<Grid Width="260" Background="#FF281F1F">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="60" />
<ColumnDefinition Width="200" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition />
</Grid.RowDefinitions>
<TextBlock HorizontalAlignment="Left" Foreground="Gray" Text="{Binding ID}" Grid.Column="0" Grid.Row="0"/>
<TextBlock HorizontalAlignment="Center" Foreground="White" Text="{Binding ProductName}" Grid.Column="1" Grid.Row="0" FontSize="12"/>
<TextBlock HorizontalAlignment="Right" Foreground="Gray" Text="Microsoft" Grid.Column="1" Grid.Row="1"/>
</Grid>
</DataTemplate>
</input:AutoCompleteBox.ItemTemplate>
</input:AutoCompleteBox>
通过List<T> 为ACB 填充数据,需使用MicrosoftProducts.cs 类:
List<MicrosoftProducts> productList = new List<MicrosoftProducts>();
productList.Add(new MicrosoftProducts() { ID = 1, ProductName = "Windows XP" });
productList.Add(new MicrosoftProducts() { ID = 2, ProductName = "Windows 7" });
productList.Add(new MicrosoftProducts() { ID = 3, ProductName = "SQL Server 2008" });
productList.Add(new MicrosoftProducts() { ID = 4, ProductName = "Visual Studio 2010" });
productList.Add(new MicrosoftProducts() { ID = 5, ProductName = "Silverlight 3" });
productList.Add(new MicrosoftProducts() { ID = 6, ProductName = "Expression Blend 3" });
productList.Add(new MicrosoftProducts() { ID = 7, ProductName = "Silverlight 4" });
productList.Add(new MicrosoftProducts() { ID = 8, ProductName = "Windows Vista" });
autoCompleteBoxWithStyle.ItemsSource = productList;
第三个ACB 使用了DataGrid 显示效果,添加DataGridSelectionAdapter.cs 类,在XAML 中加入程序命名空间 xmlns:samples="clr-namespace:SilverlightToolkit",为ACB 编写Style 代码(见源程序):
<input:AutoCompleteBox x:Name="autoCompleteBoxWithDataGrid" VerticalAlignment="Bottom" FilterMode="Contains" ValueMemberPath="ProductName"
Style="{StaticResource AutoCompleteBoxDataGridTemplate}" />
通过ObjectCollection 填充数据(需要添加System.Windows.Controls.Toolkit.dll):
ObjectCollection productDataGrid = new ObjectCollection();
productDataGrid.Add(new MicrosoftProducts() { ID = 1, ProductName = "Windows XP" });
productDataGrid.Add(new MicrosoftProducts() { ID = 2, ProductName = "Windows 7" });
productDataGrid.Add(new MicrosoftProducts() { ID = 3, ProductName = "SQL Server 2008" });
productDataGrid.Add(new MicrosoftProducts() { ID = 4, ProductName = "Visual Studio 2010" });
productDataGrid.Add(new MicrosoftProducts() { ID = 5, ProductName = "Silverlight 3" });
productDataGrid.Add(new MicrosoftProducts() { ID = 6, ProductName = "Expression Blend 3" });
productDataGrid.Add(new MicrosoftProducts() { ID = 7, ProductName = "Silverlight 4" });
productDataGrid.Add(new MicrosoftProducts() { ID = 8, ProductName = "Windows Vista" });
autoCompleteBoxWithDataGrid.ItemsSource = productDataGrid;
源代码下载:
参考资料:
AutoCompleteBox control: The missing guide
Introducing the AutoCompleteBox
来源:https://www.cnblogs.com/gnielee/archive/2010/01/25/silverlight-toolkit-autocompletebox.html