我有一个使用HierarchicalDataTemplate创建的树视图，并使用自定义类进行绑定。在treeview子项中，我有复选框，文本块和图像。我想要的是每当在UI上手动检查复选框时，我希望我的图像更改为正确的符号。 我无法弄清楚我该怎么做。以下是XAML。
<UserControl x:Class="Repayment.TreeViewCustom"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
>
<UserControl.Resources>
<SolidColorBrush x:Key="SolidColorBrush1" />
<SolidColorBrush x:Key="SolidColorBrush2" />
<SolidColorBrush x:Key="SolidColorBrush3" />
<SolidColorBrush x:Key="SolidColorBrush4" />
<SolidColorBrush x:Key="SolidColorBrush5" />
<SolidColorBrush x:Key="SolidColorBrush6" />
<Style TargetType="TextBlock" x:Key="HeaderTextBlock">
<Setter Property="Foreground" Value="{DynamicResource SolidColorBrush4}"/>
<Setter Property="FontSize" Value="14"/>
<Setter Property="Margin" Value="10 5 10 5"/>
<Setter Property="FontFamily" Value="Century Gothic"/>
<Setter Property="FontWeight" Value="Bold"/>
<Setter Property="FontStyle" Value="Italic"/>
</Style>
<Style TargetType="TextBlock" x:Key="ChildTextBlock">
<Setter Property="Foreground" Value="{DynamicResource SolidColorBrush3}"/>
<Setter Property="FontSize" Value="14"/>
<Setter Property="Margin" Value="10 5 10 5"/>
<Setter Property="FontFamily" Value="Century Gothic"/>
<Setter Property="FontWeight" Value="Bold"/>
<Setter Property="FontStyle" Value="Italic"/>
</Style>
<Style TargetType="TreeView" x:Key="BackgroundTreeView">
<Setter Property="Background" Value="{DynamicResource SolidColorBrush1}"/>
</Style>
<Style x:Key="CheckBoxStyle" TargetType="{x:Type CheckBox}">
<Setter Property="SnapsToDevicePixels" Value="true" />
<Setter Property="OverridesDefaultStyle" Value="true" />
<Setter Property="Height" Value="30" />
<Setter Property="FocusVisualStyle" Value="{DynamicResource MyFocusVisualStyte}" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type CheckBox}">
<BulletDecorator>
<BulletDecorator.Bullet>
<Grid Height="{TemplateBinding Height}" Width="{Binding RelativeSource={RelativeSource Self}, Path=Height, UpdateSourceTrigger=PropertyChanged}"
MinHeight="30" MinWidth="30" ShowGridLines="False">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="4*" />
<ColumnDefinition Width="1*" />
<ColumnDefinition Width="1*" />
<ColumnDefinition Width="4*" />
<ColumnDefinition Width="1*" />
<ColumnDefinition Width="1*" />
<ColumnDefinition Width="2*" />
<ColumnDefinition Width="2*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="3*" />
<RowDefinition Height="1*" />
<RowDefinition Height="1*" />
<RowDefinition Height="1*" />
<RowDefinition Height="4*" />
<RowDefinition Height="1*" />
<RowDefinition Height="1*" />
<RowDefinition Height="4*" />
</Grid.RowDefinitions>
<Border Name="MainBorder"
Grid.ColumnSpan="9" Grid.RowSpan="9"
CornerRadius="4"
BorderThickness="1"
Background="Transparent" />
<!--Transparent-->
<Border Name="InnerBorder"
Grid.Column="1" Grid.ColumnSpan="5"
Grid.Row="2" Grid.RowSpan="5"
BorderThickness="1"
BorderBrush="#808080" />
<!--#808080-->
<Path Name="InnerPath"
Grid.Column="1" Grid.ColumnSpan="5"
Grid.Row="2" Grid.RowSpan="5"
Data="M31,5 L19.5,5 19.5,19.5 34.5,19.5 34.5,11.75"
Stretch="Fill" Stroke="#808080"/>
<Path Name="CheckMark"
Grid.Column="2" Grid.ColumnSpan="5"
Grid.Row="1" Grid.RowSpan="5"
Opacity="0"
Data="M9.07743946676476E-09,4.31805768640244L4.68740335877841,8.86361158398516C4.68740335877841,8.86361158398516,16.3281249985376,-2.42451336648723,16.3281249985376,-2.42451336648723L14.0622100581796,-4.77304938341948 4.68740335877846,4.31805791992662 2.22656251699567,1.93164208562579z"
Fill="#3babe3"
Stretch="Fill"
Stroke="#3babe3" />
<Path Name="InderminateMark"
Grid.Column="3"
Grid.Row="4"
Data="M0,4 L1,5 5,1 4,0"
Opacity="0"
Stretch="Fill"
StrokeThickness="0"
Fill="#808080" />
</Grid>
</BulletDecorator.Bullet>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CheckStates">
<VisualState x:Name="Checked">
<Storyboard>
<DoubleAnimation Storyboard.TargetProperty="Opacity"
Storyboard.TargetName="CheckMark" Duration="0:0:0.1" To="1" />
</Storyboard>
</VisualState>
<VisualState x:Name="Unchecked" >
<Storyboard>
<DoubleAnimation Storyboard.TargetProperty="Opacity"
Storyboard.TargetName="CheckMark" Duration="0:0:0.2" To="0" />
</Storyboard>
</VisualState>
<VisualState x:Name="Indeterminate">
<Storyboard>
<DoubleAnimation Storyboard.TargetProperty="Opacity"
Storyboard.TargetName="InderminateMark" Duration="0:0:0.1" To="1" />
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<ContentPresenter Margin="4,0,4,0"
VerticalAlignment="Center"
HorizontalAlignment="Left"
RecognizesAccessKey="True" />
</BulletDecorator>
<ControlTemplate.Triggers>
<Trigger Property="IsChecked" Value="True">
<Setter TargetName="InnerBorder" Property="Visibility" Value="Collapsed" />
</Trigger>
<Trigger Property="IsPressed" Value="True">
<Setter TargetName="MainBorder" Property="Background" Value="#81d2eb" />
</Trigger>
<Trigger Property="IsEnabled" Value="False">
<Setter TargetName="CheckMark" Property="Fill" Value="#cccccc" />
<Setter TargetName="CheckMark" Property="Stroke" Value="#cccccc" />
<Setter TargetName="InnerPath" Property="Stroke" Value="#cccccc" />
<Setter TargetName="InderminateMark" Property="Fill" Value="#cccccc" />
<Setter TargetName="InnerBorder" Property="BorderBrush" Value="#cccccc" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</UserControl.Resources>
<Grid>
<TreeView MinWidth="200" Name ="tvMain" TreeViewItem.Selected="tvMain_Selected" Style="{DynamicResource BackgroundTreeView}">
<TreeView.ItemContainerStyle>
<Style TargetType="TreeViewItem">
<Setter Property="IsExpanded" Value="True"/>
</Style>
</TreeView.ItemContainerStyle>
<TreeView.ItemTemplate>
<HierarchicalDataTemplate ItemsSource="{Binding ChildStep}">
<Border MinWidth="270" Height="26" Background="{DynamicResource SolidColorBrush2}" BorderBrush="{DynamicResource SolidColorBrush1}" BorderThickness="1" CornerRadius="2" Margin="2" Padding="2">
<StackPanel Orientation="Horizontal" >
<TextBlock Text="{Binding Name}" TextAlignment="Center" HorizontalAlignment="Center" VerticalAlignment="Center" Style="{DynamicResource HeaderTextBlock}"></TextBlock>
</StackPanel>
</Border>
<HierarchicalDataTemplate.ItemTemplate>
<HierarchicalDataTemplate ItemsSource="{Binding GrandChildStep}">
<Border Width="250" Background="{DynamicResource SolidColorBrush1}" BorderBrush="{DynamicResource SolidColorBrush2}" CornerRadius="2" Margin="1" >
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="26"></ColumnDefinition>
<ColumnDefinition Width="*"></ColumnDefinition>
<ColumnDefinition Width="26"></ColumnDefinition>
</Grid.ColumnDefinitions>
<CheckBox Checked="CheckBox_Checked" Unchecked="CheckBox_Checked" IsChecked="{Binding Path=IsCheckBoxChecked}" HorizontalAlignment="Center" VerticalAlignment="Center" Style="{DynamicResource CheckBoxStyle}" Grid.Column="0" />
<TextBlock Grid.Column="1" Margin="2" Text="{Binding Path=Name}" Style="{DynamicResource ChildTextBlock}" VerticalAlignment="Center"></TextBlock>
<!--<Rectangle Name ="rct" Width="20" Fill="{Binding Path=Color}" Grid.Column="1" HorizontalAlignment="Right" Margin="2"></Rectangle>-->
<Image Grid.Column="2" Source="{Binding ImageUrl}" HorizontalAlignment="Right" Margin="2"></Image>
</Grid>
</Border>
<HierarchicalDataTemplate.ItemTemplate>
<DataTemplate>
<Border Width="200" Background="LightBlue" CornerRadius="2" Margin="1" >
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"></ColumnDefinition>
<ColumnDefinition Width="26"></ColumnDefinition>
</Grid.ColumnDefinitions>
<TextBlock Margin="2" Text="{Binding Path=Name}" FontWeight="Bold" VerticalAlignment="Center"></TextBlock>
<Rectangle Width="20" Fill="DarkOrchid" Grid.Column="1" HorizontalAlignment="Right" Margin="2"></Rectangle>
</Grid>
</Border>
</DataTemplate>
</HierarchicalDataTemplate.ItemTemplate>
</HierarchicalDataTemplate>
</HierarchicalDataTemplate.ItemTemplate>
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
</TreeView>
</Grid>
答案 0 :(得分：0)
您可以使用多绑定转换器来获取对象集合并根据这些对象返回值。这是一个例子;
public class CheckedAndImageURLMultiValueConverter : IMultiValueConverter
{
public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
var checkboxIsChecked = (bool?)values[0];
ImageSource newImageURL = ...;
var imageURL = (ImageSource)values[1];
if (checkboxIsChecked == true)
{
return newImageURL;
}
return imageURL;
}
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
在这个示例中，如果选中复选框，则会获得一个图像源，如果没有，则会获得另一个图像源，这可能不是您想要的（并且我没有包含newImageSource的值）但希望您能够根据您的需求进行调整。
接下来，您需要在xaml中添加对它的引用。像这样的东西;
<Window.Resources>
...
<local:CheckedAndImageURLMultiValueConverter x:Key="AndImageUrlMultiValueConverter"/>
</Window.Resources>
最后你必须更换你的图像xaml以使用类似这样的多重绑定;
<Image Grid.Column="2" HorizontalAlignment="Right" Margin="2">
<Image.Source>
<MultiBinding Converter="{StaticResource AndImageUrlMultiValueConverter}">
<Binding Path="IsCheckBoxChecked" />
<Binding Path="ImageURL" />
</MultiBinding>
</Image.Source>
</Image>
由于您正在使用转换器，因此您可以非常灵活地使用绑定的内容，只需将对象值关闭回multiConverter中的原始类型，执行您需要的逻辑，然后根据此返回值。 / p>
注意绑定在xaml中出现的顺序，它们需要匹配multiConverter中object []值的顺序。
你不必仅限于两个绑定。多转换器允许您绑定更多。
我希望这会有所帮助。