[WPF系列]-数据邦定之DataTemplate 对 ItemsControl 进行样式和模板处理

时间:2024-01-14 14:11:38

引言

 

即使 ItemsControl 不是 DataTemplate 所用于的唯一控件类型,将 ItemsControl 绑定到集合仍然很常见。 在 DataTemplate 中有哪些内容一节中,我们讨论了您的 DataTemplate 定义应当仅与数据表示相关。

 

为了明确何时不适合使用 DataTemplate,有必要了解 ItemsControl 提供的不同样式和模板属性。

 

实例演示

 

下面的示例旨在演示这些属性中每一个属性的功能。 本示例中的 ItemsControl 绑定到与前面示例中的 Tasks 集合。

 

为便于演示,本示例中的样式和模板都进行了内联声明。

 

<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>

 

效果如图示:

[WPF系列]-数据邦定之DataTemplate 对 ItemsControl 进行样式和模板处理

 

请注意,您可以使用 ItemTemplateSelector,而不是 ItemTemplate。同样,可以选择使用 ItemContainerStyleSelector,而不是 ItemContainerStyle

这里未显示 ItemsControl 的其他两个与样式相关的属性,它们是 GroupStyleGroupStyleSelector

 

 

参考

http://msdn.microsoft.com/zh-cn/library/ms742521(v=vs.110).aspx