我在ResourceDictionary中声明了一个样式,如此。
<Style x:Key="MapMarkerLabelStyle" TargetType="{x:Type TextBlock}">
<Setter Property="RenderTransform">
<Setter.Value>
<TranslateTransform X="{Binding ActualWidth,
Converter={StaticResource DoubleMultiplierConverter},
ConverterParameter=-0.5}"
Y="-62"></TranslateTransform>
</Setter.Value>
</Setter>
</Style>
和文本块
<TextBlock Style="{StaticResource MapMarkerLabelStyle}" />
转换器:
public class DoubleMultiplierConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
var originalValue = (double) value;
var format = new NumberFormatInfo {NumberDecimalSeparator = "."};
var multiplier = System.Convert.ToDouble(parameter, format);
return originalValue * multiplier;
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
在translate转换中,我需要访问textblock ActualWidth属性,但无法弄清楚绑定的外观。
答案 0 :(得分:1)
试试这个。
<TranslateTransform X="{Binding RelativeSource={RelativeSource Self},
Path=ActualWidth,
Converter={StaticResource DoubleMultiplierConverter},
ConverterParameter=-0.5}"
Y="-62">
</TranslateTransform>
答案 1 :(得分:1)
Binding缺少一个合适的源对象。要绑定到TextBlock的ActualWidth
属性,您应该像这样设置RelativeSource
:
<Style x:Key="MapMarkerLabelStyle" TargetType="TextBlock">
<Setter Property="RenderTransform">
<Setter.Value>
<TranslateTransform
X="{Binding Path=ActualWidth,
RelativeSource={RelativeSource AncestorType=TextBlock}
Converter={StaticResource DoubleMultiplierConverter},
ConverterParameter=-0.5}"
Y="-62"/>
</Setter.Value>
</Setter>
</Style>