Create a tooltip that shows all Validation.Errors for a control using INotifyDataErrorInfo in WPF 4.5

Question

I have several controls, including TextBox and ComboBox, and I would like all of them to display a tooltip with all the errors contained in the Validation.Errors collection. I would like them all to share a common style, if possible, and this is what I'm trying. I am convinced that I am doing something wrong with my binding in the ToolTip, but I can’t understand that. I return an Error object in my implementation of INotifyDataErrorInfo, which determines the severity of the error (error or warning).

I would like to have a style that applies to all controls in a window that will display a tooltip containing a list of all errors and warnings for that control. Errors should be displayed in red and warnings should be yellow. Here is the style I came up with:

        <Style TargetType="FrameworkElement">
        <Setter Property="ToolTip">
            <Setter.Value>
                <ItemsControl ItemsSource="{Binding Path=(Validation.Errors), RelativeSource={RelativeSource Self}}">
                    <ItemsControl.ItemTemplate>
                        <DataTemplate>
                            <TextBlock Text="{Binding ErrorContent.ErrorMessage}">
                                <TextBlock.Style>
                                    <Style TargetType="TextBlock">
                                        <Setter Property="Foreground" Value="Red"/>
                                        <Style.Triggers>
                                            <DataTrigger Binding="{Binding ErrorContent.ErrorSeverity}"
                                                             Value="{x:Static local:ErrorType.Warning}">
                                                <Setter Property="Foreground" Value="Yellow"/>
                                            </DataTrigger>
                                        </Style.Triggers>
                                    </Style>
                                </TextBlock.Style>
                            </TextBlock>
                        </DataTemplate>
                    </ItemsControl.ItemTemplate>
                </ItemsControl>
            </Setter.Value>
        </Setter>
        <Style.Triggers>
            <DataTrigger Binding="{Binding Path=(Validation.HasError)}" Value="True">
                <Setter Property="ToolTip">
                    <Setter.Value>
                        <ItemsControl ItemsSource="{Binding Path=(Validation.Errors)}">
                            <ItemsControl.ItemTemplate>
                                <DataTemplate>
                                    <TextBlock Text="{Binding ErrorContent.ErrorMessage}">
                                        <TextBlock.Style>
                                            <Style TargetType="TextBlock">
                                                <Setter Property="Foreground" Value="Red"/>
                                                <Style.Triggers>
                                                    <DataTrigger Binding="{Binding ErrorContent.ErrorSeverity}"
                                                             Value="{x:Static local:ErrorType.Warning}">
                                                        <Setter Property="Foreground" Value="Yellow"/>
                                                    </DataTrigger>
                                                </Style.Triggers>
                                            </Style>
                                        </TextBlock.Style>
                                    </TextBlock>
                                </DataTemplate>
                            </ItemsControl.ItemTemplate>
                        </ItemsControl>
                    </Setter.Value>
                </Setter>
            </DataTrigger>
        </Style.Triggers>
    </Style>

I tried changing the RelativeSource to look for AncestoryType controls as in AncestorLevel 1 and 2. None of this works.

ControlTemplate, ErrorTemplate, : , , ToolTip . , - , ErrorTemplate DataContext Validation.Errors, ItemsSource ItmesCollection. . ControlTemplate, ErrorTemplate:

        <ControlTemplate x:Key="ErrorTemplate">
        <Border BorderThickness="1">
            <AdornedElementPlaceholder Name="ElementPlaceholder"/>
            <Border.Style>
                <Style TargetType="Border">
                    <Setter Property="BorderBrush" Value="Red"/>
                    <Style.Triggers>
                        <DataTrigger Binding="{Binding ElementName=ElementPlaceholder, Path=AdornedElement.(Validation.Errors)[0].ErrorContent.ErrorSeverity}"
                                         Value="{x:Static local:ErrorType.Warning}">
                            <Setter Property="BorderBrush" Value="Yellow"/>
                        </DataTrigger>
                    </Style.Triggers>
                </Style>
            </Border.Style>
            <Border.ToolTip>
                <ItemsControl ItemsSource="{Binding}">
                    <ItemsControl.ItemTemplate>
                        <DataTemplate>
                            <TextBlock Text="{Binding ErrorContent.ErrorMessage}">
                                <TextBlock.Style>
                                    <Style TargetType="TextBlock">
                                        <Setter Property="Foreground" Value="Red"/>
                                        <Style.Triggers>
                                            <DataTrigger Binding="{Binding ErrorContent.ErrorSeverity}"
                                                             Value="{x:Static local:ErrorType.Warning}">
                                                <Setter Property="Foreground" Value="Yellow"/>
                                            </DataTrigger>
                                        </Style.Triggers>
                                    </Style>
                                </TextBlock.Style>
                            </TextBlock>
                        </DataTemplate>
                    </ItemsControl.ItemTemplate>
                </ItemsControl>
            </Border.ToolTip>
        </Border>
    </ControlTemplate>

- - ?

Answer 1

, , , MSDN, . , TargetType, , . -, , , , , , . , ListBox/ItemsControl , XAML, , . :

        <Style TargetType="Control" x:Key="ErrorToolTip">
        <Style.Resources>
            <Style TargetType="ListBoxItem">
                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate>
                            <TextBlock Text="{Binding ErrorContent.ErrorMessage}"
                                       Background="Transparent">
                                <TextBlock.Style>
                                    <Style TargetType="TextBlock">
                                        <Setter Property="Foreground" Value="Red"/>
                                        <Style.Triggers>
                                            <DataTrigger Binding="{Binding ErrorContent.ErrorSeverity}"
                                                         Value="{x:Static local:ErrorType.Warning}">
                                                <Setter Property="Foreground" Value="Orange" />
                                            </DataTrigger>
                                        </Style.Triggers>
                                    </Style>
                                </TextBlock.Style>
                            </TextBlock>
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>
            </Style>
        </Style.Resources>
        <Style.Triggers>
            <Trigger Property="Validation.HasError" Value="True">
                <Setter Property="ToolTip"
                        Value="{Binding RelativeSource={RelativeSource Self}, Path=(Validation.Errors), Converter={StaticResource ErrorCollectionConverter}}">
                </Setter>
            </Trigger>
        </Style.Triggers>
    </Style>
    <Style TargetType="TextBox" BasedOn="{StaticResource ErrorToolTip}"/>
    <Style TargetType="ComboBox" BasedOn="{StaticResource ErrorToolTip}"/>

:

        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        if (value == null) return null;
        return new ListBox
        {
            ItemsSource = (ReadOnlyObservableCollection<ValidationError>) value,
            BorderThickness = new Thickness(0),
            Background = Brushes.Transparent
        };
    }

, , . - , , .

Answer 2

.

"Tooltip", :

<Trigger Property="Validation.HasError" Value="True">
      <Setter Property="ToolTip"
              Value="{Binding RelativeSource={RelativeSource Self},  Path=(Validation.Errors), Converter={StaticResource ErrorCollectionConverter}}">
      </Setter>
</Trigger>

" " "PlacementTarget" . , .

, :

<Trigger Property="Validation.HasError" Value="True">
      <Setter Property="ToolTip">
          <Setter.Value>
               <ToolTip DataContext="{Binding RelativeSource={RelativeSource Self}, Path=PlacementTarget}">
                   <ItemsControl ItemsSource="{Binding Path=(Validation.Errors)}" DisplayMemberPath="ErrorContent" />
               </ToolTip>
          </Setter.Value>
      </Setter>
</Trigger>

Tooltip PlacementTarget ItemsControl. RelativeSource AncestorType ItemsControl.

, :)

Answer 3

Matts, . TextBox . , , .    DisplayMemberPath = "ErrorContent" .

TextBox, , Validation.HasError true:

<UserControl.Resources>
    <ui:ErrorCollectionConverter x:Key="ErrorCollectionConverter"></ui:ErrorCollectionConverter>
    <Style TargetType="TextBox">
        <Style.Triggers>
            <Trigger Property="Validation.HasError" Value="True">
                <Setter Property="ToolTip"
                    Value="{Binding RelativeSource={RelativeSource Self},  Path=(Validation.Errors), Converter={StaticResource ErrorCollectionConverter}}">
                </Setter>
            </Trigger>
        </Style.Triggers>
    </Style>
</UserControl.Resources>

"" TextBox :

<TextBox Text="{Binding Directory, UpdateSourceTrigger=PropertyChanged, ValidatesOnNotifyDataErrors=True}"></TextBox>

, ErrorContent:

internal class ErrorCollectionConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        if (value == null) return null;
        return new ListBox
        {
            ItemsSource = (ReadOnlyObservableCollection<ValidationError>)value,
            BorderThickness = new Thickness(0),
            Background = Brushes.Transparent,
            DisplayMemberPath = "ErrorContent"
        };
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}