引言
即使 ItemsControl 不是 DataTemplate 所用於的唯一控件類型,將 ItemsControl 綁定到集合仍然很常見。 在 DataTemplate 中有哪些內容一節中,我們討論了您的 DataTemplate 定義應當僅與數據表示相關。
為了明確何時不適合使用 DataTemplate,有必要了解 ItemsControl 提供的不同樣式和模板屬性。
實例演示
下面的示例旨在演示這些屬性中每一個屬性的功能。 本示例中的 ItemsControl 綁定到與前面示例中的 Tasks 集合。
為便於演示,本示例中的樣式和模板都進行了內聯聲明。
<ItemsControl Margin="10" ItemsSource="{Binding Source={StaticResource myTodoList}}"> <!--The ItemsControl has no default visual appearance. Use the Template property to specify a ControlTemplate to define the appearance of an ItemsControl. The ItemsPresenter uses the specified ItemsPanelTemplate (see below) to layout the items. If an ItemsPanelTemplate is not specified, the default is used. (For ItemsControl, the default is an ItemsPanelTemplate that specifies a StackPanel.--> <ItemsControl.Template> <ControlTemplate TargetType="ItemsControl"> <Border BorderBrush="Aqua" BorderThickness="1" CornerRadius="15"> <ItemsPresenter/> </Border> </ControlTemplate> </ItemsControl.Template> <!--Use the ItemsPanel property to specify an ItemsPanelTemplate that defines the panel that is used to hold the generated items. In other words, use this property if you want to affect how the items are laid out.--> <ItemsControl.ItemsPanel> <ItemsPanelTemplate> <WrapPanel /> </ItemsPanelTemplate> </ItemsControl.ItemsPanel> <!--Use the ItemTemplate to set a DataTemplate to define the visualization of the data objects. This DataTemplate specifies that each data object appears with the Proriity and TaskName on top of a silver ellipse.--> <ItemsControl.ItemTemplate> <DataTemplate> <DataTemplate.Resources> <Style TargetType="TextBlock"> <Setter Property="FontSize" Value="18"/> <Setter Property="HorizontalAlignment" Value="Center"/> </Style> </DataTemplate.Resources> <Grid> <Ellipse Fill="Silver"/> <StackPanel> <TextBlock Margin="3,3,3,0" Text="{Binding Path=Priority}"/> <TextBlock Margin="3,0,3,7" Text="{Binding Path=TaskName}"/> </StackPanel> </Grid> </DataTemplate> </ItemsControl.ItemTemplate> <!--Use the ItemContainerStyle property to specify the appearance of the element that contains the data. This ItemContainerStyle gives each item container a margin and a width. There is also a trigger that sets a tooltip that shows the description of the data object when the mouse hovers over the item container.--> <ItemsControl.ItemContainerStyle> <Style> <Setter Property="Control.Width" Value="100"/> <Setter Property="Control.Margin" Value="5"/> <Style.Triggers> <Trigger Property="Control.IsMouseOver" Value="True"> <Setter Property="Control.ToolTip" Value="{Binding RelativeSource={x:Static RelativeSource.Self}, Path=Content.Description}"/> </Trigger> </Style.Triggers> </Style> </ItemsControl.ItemContainerStyle> </ItemsControl>
效果如圖示:
請注意,您可以使用 ItemTemplateSelector,而不是 ItemTemplate。同樣,可以選擇使用 ItemContainerStyleSelector,而不是 ItemContainerStyle。
這里未顯示 ItemsControl 的其他兩個與樣式相關的屬性,它們是 GroupStyle 和 GroupStyleSelector。
參考
http://msdn.microsoft.com/zh-cn/library/ms742521(v=vs.110).aspx