首先创建一个自定义控件，继承自FrameworkElement，“Generic.xaml”中可以不添加样式。
要自定义空心文字，要用到绘制格式化文本FormattedText类。FormattedText对象提供的文本格式设置功能比WPF提供的已有文本控件提供的相应功能更为强大。调用FormattedText构造函数，可以传入相应的参数，得到我们想要的文本样式。使用 MaxTextWidth 属性可以将文本约束为特定宽度。 文本将自动换行，以避免超过指定宽度。 使用 MaxTextHeight 属性可以将文本约束为特定高度。 超过指定高度的文本将显示一个省略号“…”。
接下来重写OnRender方法，在方法体中调用DrawingContext对象的DrawGeometry方法即可完成文本的绘制工作。
public class OutlinedText : FrameworkElement, IAddChild
{
/// <summary>
/// 静态构造函数
/// </summary>
static OutlinedText()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(OutlinedText), new FrameworkPropertyMetadata(typeof(OutlinedText)));
} #region Private Fields /// <summary>
/// 文字几何形状
/// </summary>
private Geometry m_TextGeometry; #endregion #region Private Methods /// <summary>
/// 当依赖项属性改变文字无效时，创建新的空心文字对象来显示。
/// </summary>
/// <param name="d"></param>
/// <param name="e"></param>
private static void OnOutlineTextInvalidated(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
if (Convert.ToString(e.NewValue) != Convert.ToString(e.OldValue))
{
((OutlinedText)d).CreateText();
}
} #endregion #region FrameworkElement Overrides /// <summary>
/// 重写绘制文字的方法。
/// </summary>
/// <param name="drawingContext">空心文字控件的绘制上下文。</param>
protected override void OnRender(DrawingContext drawingContext)
{
//CreateText();
// 基于设置的属性绘制空心文字控件。
drawingContext.DrawGeometry(Fill, new Pen(Stroke, StrokeThickness), m_TextGeometry);
} /// <summary>
/// 基于格式化文字创建文字的几何轮廓。
/// </summary>
public void CreateText()
{
FontStyle fontStyle = FontStyles.Normal;
FontWeight fontWeight = FontWeights.Medium;
if (Bold == true)
fontWeight = FontWeights.Bold;
if (Italic == true)
fontStyle = FontStyles.Italic;
// 基于设置的属性集创建格式化的文字。
FormattedText formattedText = new FormattedText(
Text, CultureInfo.GetCultureInfo("en-us"), FlowDirection.LeftToRight,
new Typeface(Font, fontStyle, fontWeight, FontStretches.Normal),
FontSize, Brushes.Black);
formattedText.MaxTextWidth = this.MaxTextWidth;
formattedText.MaxTextHeight = this.MaxTextHeight;
// 创建表示文字的几何对象。
m_TextGeometry = formattedText.BuildGeometry(new Point(, ));
// 基于格式化文字的大小设置空心文字的大小。
this.MinWidth = formattedText.Width;
this.MinHeight = formattedText.Height;
} #endregion #region DependencyProperties /// <summary>
/// 指定将文本约束为特定宽度
/// </summary>
public double MaxTextWidth
{
get { return (double)GetValue(MaxTextWidthProperty); }
set { SetValue(MaxTextWidthProperty, value); }
}
/// <summary>
/// 指定将文本约束为特定宽度依赖属性
/// </summary>
public static readonly DependencyProperty MaxTextWidthProperty =
DependencyProperty.Register("MaxTextWidth", typeof(double), typeof(OutlinedText),
new FrameworkPropertyMetadata(1000.0, FrameworkPropertyMetadataOptions.AffectsRender, new PropertyChangedCallback(OnOutlineTextInvalidated), null)); /// <summary>
/// 指定将文本约束为特定高度
/// </summary>
public double MaxTextHeight
{
get { return (double)GetValue(MaxTextHeightProperty); }
set { SetValue(MaxTextHeightProperty, value); }
}
/// <summary>
/// 指定将文本约束为特定高度依赖属性
/// </summary>
public static readonly DependencyProperty MaxTextHeightProperty =
DependencyProperty.Register("MaxTextHeight", typeof(double), typeof(OutlinedText),
new FrameworkPropertyMetadata(1000.0, FrameworkPropertyMetadataOptions.AffectsRender, new PropertyChangedCallback(OnOutlineTextInvalidated), null)); /// <summary>
/// 指定字体是否加粗。
/// </summary>
public bool Bold
{
get { return (bool)GetValue(BoldProperty); }
set { SetValue(BoldProperty, value); }
}
/// <summary>
/// 指定字体是否加粗依赖属性。
/// </summary>
public static readonly DependencyProperty BoldProperty = DependencyProperty.Register(
"Bold", typeof(bool), typeof(OutlinedText),
new FrameworkPropertyMetadata(false, FrameworkPropertyMetadataOptions.AffectsRender, new PropertyChangedCallback(OnOutlineTextInvalidated), null)); /// <summary>
/// 指定填充字体的画刷颜色。
/// </summary>
///
public Brush Fill
{
get { return (Brush)GetValue(FillProperty); }
set { SetValue(FillProperty, value); }
}
/// <summary>
/// 指定填充字体的画刷颜色依赖属性。
/// </summary>
public static readonly DependencyProperty FillProperty = DependencyProperty.Register(
"Fill", typeof(Brush), typeof(OutlinedText),
new FrameworkPropertyMetadata(new SolidColorBrush(Colors.LightSteelBlue), FrameworkPropertyMetadataOptions.AffectsRender, new PropertyChangedCallback(OnOutlineTextInvalidated), null)); /// <summary>
/// 指定文字显示的字体。
/// </summary>
public FontFamily Font
{
get { return (FontFamily)GetValue(FontProperty); }
set { SetValue(FontProperty, value); }
}
/// <summary>
/// 指定文字显示的字体依赖属性。
/// </summary>
public static readonly DependencyProperty FontProperty = DependencyProperty.Register(
"Font", typeof(FontFamily), typeof(OutlinedText),
new FrameworkPropertyMetadata(new FontFamily("Arial"), FrameworkPropertyMetadataOptions.AffectsRender, new PropertyChangedCallback(OnOutlineTextInvalidated), null)); /// <summary>
/// 指定字体大小。
/// </summary>
public double FontSize
{
get { return (double)GetValue(FontSizeProperty); }
set { SetValue(FontSizeProperty, value); }
}
/// <summary>
/// 指定字体大小依赖属性。
/// </summary>
public static readonly DependencyProperty FontSizeProperty = DependencyProperty.Register(
"FontSize", typeof(double), typeof(OutlinedText),
new FrameworkPropertyMetadata((double)48.0, FrameworkPropertyMetadataOptions.AffectsRender, new PropertyChangedCallback(OnOutlineTextInvalidated), null)); /// <summary>
/// 指定字体是否显示斜体字体样式。
/// </summary>
public bool Italic
{
get { return (bool)GetValue(ItalicProperty); }
set { SetValue(ItalicProperty, value); }
}
/// <summary>
/// 指定字体是否显示斜体字体样式依赖属性。
/// </summary>
public static readonly DependencyProperty ItalicProperty = DependencyProperty.Register(
"Italic", typeof(bool), typeof(OutlinedText),
new FrameworkPropertyMetadata(false, FrameworkPropertyMetadataOptions.AffectsRender, new PropertyChangedCallback(OnOutlineTextInvalidated), null)); /// <summary>
/// 指定绘制空心字体边框画刷的颜色。
/// </summary>
public Brush Stroke
{
get { return (Brush)GetValue(StrokeProperty); }
set { SetValue(StrokeProperty, value); }
}
/// <summary>
/// 指定绘制空心字体边框画刷的颜色依赖属性。
/// </summary>
public static readonly DependencyProperty StrokeProperty = DependencyProperty.Register(
"Stroke", typeof(Brush), typeof(OutlinedText),
new FrameworkPropertyMetadata(new SolidColorBrush(Colors.Teal), FrameworkPropertyMetadataOptions.AffectsRender, new PropertyChangedCallback(OnOutlineTextInvalidated), null)); /// <summary>
/// 指定空心字体边框大小。
/// </summary>
public ushort StrokeThickness
{
get { return (ushort)GetValue(StrokeThicknessProperty); }
set { SetValue(StrokeThicknessProperty, value); }
}
/// <summary>
/// 指定空心字体边框大小依赖属性。
/// </summary>
public static readonly DependencyProperty StrokeThicknessProperty =
DependencyProperty.Register("StrokeThickness",
typeof(ushort), typeof(OutlinedText),
new FrameworkPropertyMetadata((ushort), FrameworkPropertyMetadataOptions.AffectsRender, new PropertyChangedCallback(OnOutlineTextInvalidated), null)); /// <summary>
/// 指定要显示的文字字符串。
/// </summary>
public string Text
{
get { return (string)GetValue(TextProperty); }
set { SetValue(TextProperty, value); }
}
/// <summary>
/// 指定要显示的文字字符串依赖属性。
/// </summary>
public static readonly DependencyProperty TextProperty = DependencyProperty.Register(
"Text", typeof(string), typeof(OutlinedText),
new FrameworkPropertyMetadata("",
FrameworkPropertyMetadataOptions.AffectsRender,
new PropertyChangedCallback(OnOutlineTextInvalidated),
null)); #endregion #region Public Methods /// <summary>
/// 添加子对象。
/// </summary>
/// <param name="value">要添加的子对象。</param>
public void AddChild(Object value)
{ } /// <summary>
/// 将节点的文字内容添加到对象。
/// </summary>
/// <param name="value">要添加到对象的文字。</param>
public void AddText(string value)
{
Text = value;
} #endregion
}