在数据模板中使用样式

Question

我有一个名为item的类,它只包含两个属性.我将它们显示在屏幕上作为带有样式的按钮.这个问题涉及我如何根据IsSelected值设置按钮样式,当我想要影响的元素是样式而不是数据模板时.我已经尝试过触发器但无法使其工作.

课程如下.

public class Item : ObservableObject
{
    private string _title;
    private bool _isSelected;

    public string Title
    {
        get { return _title; }
        set
        {
            _title = value;
            RaisePropertyChanged("Title");
        }
    }

    public bool IsSelected
    {
        get { return _isSelected; }
        set
        {
            _isSelected = value;
            RaisePropertyChanged("IsSelected");
        }
    }
}

我使用数据模板在ItemsControls中显示这些项目.

<ItemsControl ItemsSource="{Binding Path=Items}" ItemTemplate="{StaticResource ResourceKey=ItemTemplate}">
        <ItemsControl.ItemsPanel>
            <ItemsPanelTemplate>
                <StackPanel Orientation="Horizontal" />
            </ItemsPanelTemplate>
        </ItemsControl.ItemsPanel>
    </ItemsControl>

使用以下样式和数据模板.

<Style x:Key="ItemButton" TargetType="Button">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type Button}">
                <Border Name="ButtonBorder" BorderThickness="2,2,2,0" BorderBrush="#AAAAAA"  CornerRadius="6,6,0,0"  Margin="2,20,0,0" Background="Black">
                    <ContentPresenter
                            VerticalAlignment="Center"  
                            HorizontalAlignment="Center"/>
                </Border>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>
<DataTemplate x:Key="ItemTemplate">
    <Button Height="60" Style="{StaticResource ItemButton}" Name="Button">
        <StackPanel Orientation="Horizontal">
            <TextBlock Text="{Binding Path=Title}" 
                       HorizontalAlignment="Left" Margin="5,5,5,3" FontSize="25" Foreground="#6B6B6B" FontFamily="Arial" />
                <Button Style="{StaticResource NoChromeButton}" Margin="0,0,5,0">
                <Button.Content>
                    <Image Height="20" Source="/WpfApplication1;component/Image/dialogCloseButton.png"></Image>
                </Button.Content>
                <Button.ToolTip>
                    Close    
                </Button.ToolTip>
            </Button>
        </StackPanel>
    </Button>
</DataTemplate>

当IsSelected为True时,我需要在对象Item上将"ButtonBorder"的背景从黑色更改为白色.

我在数据模板中的触发器中添加了这不起作用,我想是因为样式会覆盖DataTemplate,因此背景保持白色.然而,当我尝试在风格中执行触发器时,我无法访问属性IsSelected？

DataTemplate触发器

    <DataTemplate.Triggers>
        <DataTrigger Binding="{Binding IsSelected}" Value="True">
            <Setter TargetName="Button" Property="Background" Value="White"/>
        </DataTrigger>
    </DataTemplate.Triggers>

风格触发器

    <Style.Triggers>
        <DataTrigger Binding="{Binding IsSelected}" Value="True">
            <Setter Property="Background" Value="White"/>
        </DataTrigger>
    </Style.Triggers>

我错过了什么吗？

Answer 1

让你ButtonBorder.Background成为{TemplateBinding Background},这意味着它将使用为模板化按钮分配的任何背景颜色,然后你可以根据触发器更改按钮的背景

<Style x:Key="ItemButton" TargetType="Button">
    <Setter Property="Background" Value="Black" />
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type Button}">
                <Border Name="ButtonBorder" Background="{TemplateBinding Background}" ... >
                    <ContentPresenter ... "/>
                </Border>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

<Style x:Key="SelectableItemButton" TargetType="Button" BasedOn="{StaticResource ItemButton}">
    <Setter Property="Background" Value="Black" />
    <Style.Triggers>
        <DataTrigger Binding="{Binding IsSelected}" Value="True">
            <Setter Property="Background" Value="White"/>
        </DataTrigger>
    </Style.Triggers>
</Style>

<DataTemplate x:Key="ItemTemplate">
    <Button Height="60" Style="{StaticResource SelectableItemButton}">
        ...
    </Button>
</DataTemplate>

我也正在制作一个SelectableItemButton继承自的Style ItemButton,并且只是实现了触发器