[英]Bind Property in Template
我有以下HeaderTemplate
用于Expander
:
<Expander.HeaderTemplate>
<DataTemplate>
<Grid Background="#939393">
<Grid.RowDefinitions>
<RowDefinition Height="22"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="20"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid.Resources>
<Style TargetType="{x:Type ToggleButton}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ToggleButton}">
<Border HorizontalAlignment="Center" VerticalAlignment="Center" x:Name="border" CornerRadius="5,5,5,5"
Background="Transparent" BorderBrush="#FF000000" Margin="1" BorderThickness="1,1,1,1" SnapsToDevicePixels="True">
<ContentPresenter x:Name="contentPresenter"/>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsChecked" Value="true">
<Setter Property="Background" TargetName="border" Value="DarkGray"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Grid.Resources>
<TextBlock Grid.Column="0" Background="#6E6E6E"/>
<ToggleButton Grid.Column="0" IsChecked="{Binding IsExpanded, Mode=TwoWay, RelativeSource={RelativeSource FindAncestor, AncestorType=Expander}}" Focusable="False">
<Image Source="{Binding IsExpanded, RelativeSource={RelativeSource FindAncestor, AncestorType=Expander}, Converter={StaticResource boolToExpanderDirectionConverter}}"/>
</ToggleButton>
<TextBlock Grid.Column="1" Text="General" Margin="5,1,1,1" VerticalAlignment="Top" FontWeight="Bold"/>
</Grid>
</DataTemplate>
</Expander.HeaderTemplate>
我直接在一个Expander
定义了此Headertemplate。 现在,我想将此模板移至资源,并将其应用于所有扩展器。 我现在的问题是,我不知道如何将模板中TextBlock
的标题设置为Expander
的标题。
我knwo有一个办法TemplateBinding
,但不幸的是,我不知道怎么用这个。
TemplateBinding只能在ControlTemplate中使用。TemplateBinding用于绑定到模板定义中的元素属性。
在您的示例中,您已经将controltemplate用于toggleButton。
模板绑定 示例
<Style TargetType="{x:Type ToggleButton}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ToggleButton}">
<Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}">
<ContentPresenter TextElement.Foreground="{TemplateBinding Foreground}" x:Name="contentPresenter"/>
</Border>
<ControlTemplate.Triggers>
.....
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<ToggleButton Grid.Column="0" Background="Red" BorderBrush="Black" BorderThickness="1" Foreground="White"/>
在这里Border和Contentpresnter将绑定ToggleButton的属性,该属性通常是在其定义中定义的。
但是在您的示例中,您使用了Datatemplate..so,所以您不能使用TemplateBinding ..,请单击此链接获取绑定语法。
您的示例解决方案
使用绑定语法,我们可以将Header属性绑定到不同的exapnder Text =“ {Binding Path = Header,RelativeSource = {RelativeSource AncestorType = {x:Type Expander}}}}”“
<Window.Resources>
<DataTemplate x:Key="ExpanderHeaderTemplate">
<Grid Background="#939393">
<Grid.RowDefinitions>
<RowDefinition Height="22"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="20"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid.Resources>
<Style TargetType="{x:Type ToggleButton}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ToggleButton}">
<Border HorizontalAlignment="Center" VerticalAlignment="Center" x:Name="border" CornerRadius="5,5,5,5"
Background="{TemplateBinding Background}" BorderBrush="#FF000000" Margin="1" BorderThickness="1,1,1,1" SnapsToDevicePixels="True">
<ContentPresenter x:Name="contentPresenter"/>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsChecked" Value="true">
<Setter Property="Background" TargetName="border" Value="DarkGray"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Grid.Resources>
<TextBlock Grid.Column="0" Background="#6E6E6E"/>
<ToggleButton Grid.Column="0" Background="Red" IsChecked="{Binding IsExpanded, Mode=TwoWay, RelativeSource={RelativeSource FindAncestor, AncestorType=Expander}}" Focusable="False">
<Image Source="{Binding IsExpanded, RelativeSource={RelativeSource FindAncestor, AncestorType=Expander}, Converter={StaticResource boolToExpanderDirectionConverter}}"/>
</ToggleButton>
<TextBlock Grid.Column="1" Text="{Binding Path=Header,RelativeSource={RelativeSource AncestorType={x:Type Expander}}}" Margin="5,1,1,1" VerticalAlignment="Top" FontWeight="Bold"/>
</Grid>
</DataTemplate>
</Window.Resources>
<StackPanel>
<Expander Header="General1" HeaderTemplate="{StaticResource ExpanderHeaderTemplate}"/>
<Expander Header="General2" HeaderTemplate="{StaticResource ExpanderHeaderTemplate}"/>
</StackPanel>
您可以通过下面的代码了解模板绑定,这是我在学习XAML时实现的。
<Button Template="{DynamicResource CircleButton}" Background="Green" Content="1"></Button>
<ControlTemplate x:Key="CircleButton" TargetType="{x:Type Button}">
<Grid HorizontalAlignment="Center" VerticalAlignment="Center" MinHeight="36" MinWidth="36">
<Ellipse Fill="{TemplateBinding Background}"></Ellipse>
<ContentPresenter TextBlock.FontFamily="Calibri" TextBlock.FontSize="24" TextBlock.Foreground="Wheat" HorizontalAlignment="Center" VerticalAlignment="Center"></ContentPresenter>
</Grid>
您必须提供ax:Key来控制Template,并在将其与某些特定元素绑定时定义x:key,就像我执行Template =“ {DynamicResource CircleButton}”一样。
以下是您的情况:
<Style TargetType="{x:Type Expander}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Expander}">
// Do your thing.
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
这将适用于整个应用程序中的所有Expander。 您可以将此样式放入App.xaml文件中以实现代码清洁。 希望对您有帮助。
由于您是通过DataTemplate指定HeaderTemplate,因此模板的DataContext是Header。 这个简单的例子起作用:
<Expander Header="Test">
<Expander.HeaderTemplate>
<TextBlock Text="{Binding}"/>
</Expander.HeaderTemplate>
</Expander>
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