WPF标签使FontSize适应它的宽度和高度

Question

我需要在.NET 3.5和VisualStudio 2010上开发WPF中的Label控件,其中将自动使文本填充控制区域.FontSize

我不知道是否应该创建一个CustomControl继承,Label或者我是否应该创建一个UserControl包含Label控件的.

我在这里看到一个使用a的例子ValueConverter,但我不理解它的行为,这里:动态改变字体大小.

任何人都可以给我一个线索吗？

更新:

我使用DoubleConverter之前发布的示例找到了解决方案:

灵魂使用a ValueConverter,我从示例中提取,但添加了NumerFormat IFormatProvider以正确解析"0.1"值,我发现在Decimal d1 = Decimal.Parse("0.1"); // = 1？!？:

 [ValueConversion(typeof(object), typeof(double))]
 public class DoubleConverter : IValueConverter
 {
  public object Convert(object value, Type targetType,
   object parameter, CultureInfo culture)
  {
   double dblValue = (double)value;
   double scale = Double.Parse(((string)parameter), System.Globalization.CultureInfo.InvariantCulture.NumberFormat);
   return dblValue * scale;
  }

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

然后,您必须在XAML中实例化DoubleConverter,并在FonSizeProperty中指定绑定:

<UserControl x:Class="<Namespace>.LabelAutoFontSize"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
  xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
  xmlns:me="clr-namespace:<Namespace>"
  mc:Ignorable="d" 
  d:DesignHeight="60" d:DesignWidth="278">
 <UserControl.Resources>
 <me:DoubleConverter x:Key="doubleConverter" />
 </UserControl.Resources>
 <Grid>
 <Label
  x:Name="lbl"
  FontSize="{
   Binding Path=Width,
    RelativeSource={RelativeSource AncestorType={x:Type UserControl}},
   Converter={StaticResource doubleConverter},
   ConverterParameter=0.116}"

  VerticalAlignment="Stretch"
  HorizontalAlignment="Stretch"
  Content="LabelAutoFontSize"
  d:LayoutOverrides="Width"
  HorizontalContentAlignment="Center"
  VerticalContentAlignment="Center" />
 </Grid>
</UserControl>

An important point is that the value for ConverterParameter depends absolutely from the font assigned. Each font may need a different value and you have to "play around" to get the correct value to fit exactly.

Answer 1

<Viewbox>
    <TextBlock>asd</TextBlock>
</Viewbox>

这项工作也是如此.