在WPF中,有一种方法可以从后面的代码中更改特定ListBoxItem的前景?
我有这个列表框:
<ListBox x:Name="songsListBox" Background="{DynamicResource Gray}" Foreground="{DynamicResource TextColor}" HorizontalContentAlignment="Stretch" Style="{DynamicResource musicListBox}">
<ListBox.ItemContainerStyle>
<Style TargetType="ListBoxItem" BasedOn="{StaticResource {x:Type ListBoxItem}}">
<EventSetter Event="MouseDoubleClick" Handler="ListBoxItem_MouseDoubleClick"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ListBoxItem}">
<Border x:Name="Bd" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Padding="{TemplateBinding Padding}" SnapsToDevicePixels="true">
<ContentPresenter ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" ContentStringFormat="{TemplateBinding ContentStringFormat}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
</Border>
<ControlTemplate.Triggers>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsMouseOver" Value="true"/>
</MultiTrigger.Conditions>
<Setter Property="Background" TargetName="Bd" Value="{DynamicResource LigthGray}"/>
<Setter Property="BorderBrush" TargetName="Bd" Value="{DynamicResource LigthGray}"/>
</MultiTrigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="Selector.IsSelectionActive" Value="False"/>
<Condition Property="IsSelected" Value="true"/>
</MultiTrigger.Conditions>
<Setter Property="BorderBrush" TargetName="Bd" Value="{x:Null}"/>
<Setter Property="Background" Value="{DynamicResource LigthGray}"/>
</MultiTrigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="Selector.IsSelectionActive" Value="True"/>
<Condition Property="IsSelected" Value="true"/>
</MultiTrigger.Conditions>
<Setter Property="BorderBrush" TargetName="Bd" Value="{x:Null}"/>
<Setter Property="Background" Value="{DynamicResource LigthGray}"/>
</MultiTrigger>
<Trigger Property="IsEnabled" Value="False">
<Setter Property="TextElement.Foreground" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ListBox.ItemContainerStyle>
<ListBox.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="35*"/>
<ColumnDefinition Width="25*"/>
<ColumnDefinition Width="30*"/>
<ColumnDefinition Width="60"/>
</Grid.ColumnDefinitions>
<TextBlock Text="{Binding Name}" Padding="4,0,4,0" Grid.Column="0"/>
<TextBlock Text="{Binding Artist}" Padding="4,0,4,0" Grid.Column="1"/>
<TextBlock Text="{Binding Album}" Padding="4,0,4,0" Grid.Column="2"/>
<TextBlock Text="{Binding Year}" Padding="4,0,4,0" Grid.Column="3"/>
</Grid>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
此列表框用于显示音乐库。我也有一个队列相同的ListBox。
当歌曲在两个ListBox中播放时,我想更改ListBoxItem的前景。有什么办法吗?
我不想使用SelectedItem,因为我希望播放的歌曲的颜色与SelectedItem的颜色不同。
假设数据模型具有属性IsPlaying
,则可以使用以下DataTrigger
切换项目容器的前景:
<ListView>
<ListView.ItemContainerStyle>
<Style TargetType="ListBoxItem">
<Setter Property="Foreground" Value="Black" />
<Style.Triggers>
<DataTrigger Binding="{Binding IsPlaying}" Value="True">
<Setter Property="Foreground" Value="Red" />
</DataTrigger>
</Style.Triggers>
</Style>
</ListView.ItemContainerStyle>
</ListView>