Aplicar traçado a um bloco de texto no WPF

Como você aplica o traço (contorno ao redor do texto) em um bloco de texto em xaml no WPF?

Abaixo está o meu mais idiomaticamente WPF, cheio de resources assumir isso. Ele suporta praticamente tudo que você esperaria, incluindo:

  • todas as propriedades relacionadas a fonts, incluindo stretch e estilo
  • alinhamento de texto (esquerda, direita, centro, justificar)
  • envolvimento de texto
  • aparamento de texto
  • decorações de texto (sublinhado, greve por meio de etc)

Aqui está um exemplo simples do que pode ser alcançado com isso:

 Neque porro quisquam est qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit  

O que resulta em:

insira a descrição da imagem aqui

Aqui está o código para o controle:

 using System; using System.ComponentModel; using System.Globalization; using System.Windows; using System.Windows.Documents; using System.Windows.Markup; using System.Windows.Media; [ContentProperty("Text")] public class OutlinedTextBlock : FrameworkElement { public static readonly DependencyProperty FillProperty = DependencyProperty.Register( "Fill", typeof(Brush), typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(Brushes.Black, FrameworkPropertyMetadataOptions.AffectsRender)); public static readonly DependencyProperty StrokeProperty = DependencyProperty.Register( "Stroke", typeof(Brush), typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(Brushes.Black, FrameworkPropertyMetadataOptions.AffectsRender)); public static readonly DependencyProperty StrokeThicknessProperty = DependencyProperty.Register( "StrokeThickness", typeof(double), typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(1d, FrameworkPropertyMetadataOptions.AffectsRender)); public static readonly DependencyProperty FontFamilyProperty = TextElement.FontFamilyProperty.AddOwner( typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(OnFormattedTextUpdated)); public static readonly DependencyProperty FontSizeProperty = TextElement.FontSizeProperty.AddOwner( typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(OnFormattedTextUpdated)); public static readonly DependencyProperty FontStretchProperty = TextElement.FontStretchProperty.AddOwner( typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(OnFormattedTextUpdated)); public static readonly DependencyProperty FontStyleProperty = TextElement.FontStyleProperty.AddOwner( typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(OnFormattedTextUpdated)); public static readonly DependencyProperty FontWeightProperty = TextElement.FontWeightProperty.AddOwner( typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(OnFormattedTextUpdated)); public static readonly DependencyProperty TextProperty = DependencyProperty.Register( "Text", typeof(string), typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(OnFormattedTextInvalidated)); public static readonly DependencyProperty TextAlignmentProperty = DependencyProperty.Register( "TextAlignment", typeof(TextAlignment), typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(OnFormattedTextUpdated)); public static readonly DependencyProperty TextDecorationsProperty = DependencyProperty.Register( "TextDecorations", typeof(TextDecorationCollection), typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(OnFormattedTextUpdated)); public static readonly DependencyProperty TextTrimmingProperty = DependencyProperty.Register( "TextTrimming", typeof(TextTrimming), typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(OnFormattedTextUpdated)); public static readonly DependencyProperty TextWrappingProperty = DependencyProperty.Register( "TextWrapping", typeof(TextWrapping), typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(TextWrapping.NoWrap, OnFormattedTextUpdated)); private FormattedText formattedText; private Geometry textGeometry; public OutlinedTextBlock() { this.TextDecorations = new TextDecorationCollection(); } public Brush Fill { get { return (Brush)GetValue(FillProperty); } set { SetValue(FillProperty, value); } } public FontFamily FontFamily { get { return (FontFamily)GetValue(FontFamilyProperty); } set { SetValue(FontFamilyProperty, value); } } [TypeConverter(typeof(FontSizeConverter))] public double FontSize { get { return (double)GetValue(FontSizeProperty); } set { SetValue(FontSizeProperty, value); } } public FontStretch FontStretch { get { return (FontStretch)GetValue(FontStretchProperty); } set { SetValue(FontStretchProperty, value); } } public FontStyle FontStyle { get { return (FontStyle)GetValue(FontStyleProperty); } set { SetValue(FontStyleProperty, value); } } public FontWeight FontWeight { get { return (FontWeight)GetValue(FontWeightProperty); } set { SetValue(FontWeightProperty, value); } } public Brush Stroke { get { return (Brush)GetValue(StrokeProperty); } set { SetValue(StrokeProperty, value); } } public double StrokeThickness { get { return (double)GetValue(StrokeThicknessProperty); } set { SetValue(StrokeThicknessProperty, value); } } public string Text { get { return (string)GetValue(TextProperty); } set { SetValue(TextProperty, value); } } public TextAlignment TextAlignment { get { return (TextAlignment)GetValue(TextAlignmentProperty); } set { SetValue(TextAlignmentProperty, value); } } public TextDecorationCollection TextDecorations { get { return (TextDecorationCollection)this.GetValue(TextDecorationsProperty); } set { this.SetValue(TextDecorationsProperty, value); } } public TextTrimming TextTrimming { get { return (TextTrimming)GetValue(TextTrimmingProperty); } set { SetValue(TextTrimmingProperty, value); } } public TextWrapping TextWrapping { get { return (TextWrapping)GetValue(TextWrappingProperty); } set { SetValue(TextWrappingProperty, value); } } protected override void OnRender(DrawingContext drawingContext) { this.EnsureGeometry(); drawingContext.DrawGeometry(this.Fill, new Pen(this.Stroke, this.StrokeThickness), this.textGeometry); } protected override Size MeasureOverride(Size availableSize) { this.EnsureFormattedText(); // constrain the formatted text according to the available size // the Math.Min call is important - without this constraint (which seems arbitrary, but is the maximum allowable text width), things blow up when availableSize is infinite in both directions // the Math.Max call is to ensure we don't hit zero, which will cause MaxTextHeight to throw this.formattedText.MaxTextWidth = Math.Min(3579139, availableSize.Width); this.formattedText.MaxTextHeight = Math.Max(0.0001d, availableSize.Height); // return the desired size return new Size(this.formattedText.Width, this.formattedText.Height); } protected override Size ArrangeOverride(Size finalSize) { this.EnsureFormattedText(); // update the formatted text with the final size this.formattedText.MaxTextWidth = finalSize.Width; this.formattedText.MaxTextHeight = finalSize.Height; // need to re-generate the geometry now that the dimensions have changed this.textGeometry = null; return finalSize; } private static void OnFormattedTextInvalidated(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs e) { var outlinedTextBlock = (OutlinedTextBlock)dependencyObject; outlinedTextBlock.formattedText = null; outlinedTextBlock.textGeometry = null; outlinedTextBlock.InvalidateMeasure(); outlinedTextBlock.InvalidateVisual(); } private static void OnFormattedTextUpdated(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs e) { var outlinedTextBlock = (OutlinedTextBlock)dependencyObject; outlinedTextBlock.UpdateFormattedText(); outlinedTextBlock.textGeometry = null; outlinedTextBlock.InvalidateMeasure(); outlinedTextBlock.InvalidateVisual(); } private void EnsureFormattedText() { if (this.formattedText != null || this.Text == null) { return; } this.formattedText = new FormattedText( this.Text, CultureInfo.CurrentUICulture, this.FlowDirection, new Typeface(this.FontFamily, this.FontStyle, this.FontWeight, FontStretches.Normal), this.FontSize, Brushes.Black); this.UpdateFormattedText(); } private void UpdateFormattedText() { if (this.formattedText == null) { return; } this.formattedText.MaxLineCount = this.TextWrapping == TextWrapping.NoWrap ? 1 : int.MaxValue; this.formattedText.TextAlignment = this.TextAlignment; this.formattedText.Trimming = this.TextTrimming; this.formattedText.SetFontSize(this.FontSize); this.formattedText.SetFontStyle(this.FontStyle); this.formattedText.SetFontWeight(this.FontWeight); this.formattedText.SetFontFamily(this.FontFamily); this.formattedText.SetFontStretch(this.FontStretch); this.formattedText.SetTextDecorations(this.TextDecorations); } private void EnsureGeometry() { if (this.textGeometry != null) { return; } this.EnsureFormattedText(); this.textGeometry = this.formattedText.BuildGeometry(new Point(0, 0)); } } 

Encontrei. Não é tão fácil fazer aparentemente, não há construído em texto Stroke no WPF (tipo de um grande recurso faltando se você me perguntar). Primeiro crie a class personalizada:

 using System; using System.Windows.Media; using System.Globalization; using System.Windows; using System.Windows.Markup; namespace CustomXaml { public class OutlinedText : FrameworkElement, IAddChild { #region Private Fields private Geometry _textGeometry; #endregion #region Private Methods ///  /// Invoked when a dependency property has changed. Generate a new FormattedText object to display. ///  /// OutlineText object whose property was updated. /// Event arguments for the dependency property. private static void OnOutlineTextInvalidated(DependencyObject d, DependencyPropertyChangedEventArgs e) { ((OutlinedText)d).CreateText(); } #endregion #region FrameworkElement Overrides ///  /// OnRender override draws the geometry of the text and optional highlight. ///  /// Drawing context of the OutlineText control. protected override void OnRender(DrawingContext drawingContext) { CreateText(); // Draw the outline based on the properties that are set. drawingContext.DrawGeometry(Fill, new Pen(Stroke, StrokeThickness), _textGeometry); } ///  /// Create the outline geometry based on the formatted text. ///  public void CreateText() { FontStyle fontStyle = FontStyles.Normal; FontWeight fontWeight = FontWeights.Medium; if (Bold == true) fontWeight = FontWeights.Bold; if (Italic == true) fontStyle = FontStyles.Italic; // Create the formatted text based on the properties set. FormattedText formattedText = new FormattedText( Text, CultureInfo.GetCultureInfo("en-us"), FlowDirection.LeftToRight, new Typeface(Font, fontStyle, fontWeight, FontStretches.Normal), FontSize, Brushes.Black // This brush does not matter since we use the geometry of the text. ); // Build the geometry object that represents the text. _textGeometry = formattedText.BuildGeometry(new Point(0, 0)); //set the size of the custome control based on the size of the text this.MinWidth = formattedText.Width; this.MinHeight = formattedText.Height; } #endregion #region DependencyProperties ///  /// Specifies whether the font should display Bold font weight. ///  public bool Bold { get { return (bool)GetValue(BoldProperty); } set { SetValue(BoldProperty, value); } } ///  /// Identifies the Bold dependency property. ///  public static readonly DependencyProperty BoldProperty = DependencyProperty.Register( "Bold", typeof(bool), typeof(OutlinedText), new FrameworkPropertyMetadata( false, FrameworkPropertyMetadataOptions.AffectsRender, new PropertyChangedCallback(OnOutlineTextInvalidated), null ) ); ///  /// Specifies the brush to use for the fill of the formatted text. ///  public Brush Fill { get { return (Brush)GetValue(FillProperty); } set { SetValue(FillProperty, value); } } ///  /// Identifies the Fill dependency property. ///  public static readonly DependencyProperty FillProperty = DependencyProperty.Register( "Fill", typeof(Brush), typeof(OutlinedText), new FrameworkPropertyMetadata( new SolidColorBrush(Colors.LightSteelBlue), FrameworkPropertyMetadataOptions.AffectsRender, new PropertyChangedCallback(OnOutlineTextInvalidated), null ) ); ///  /// The font to use for the displayed formatted text. ///  public FontFamily Font { get { return (FontFamily)GetValue(FontProperty); } set { SetValue(FontProperty, value); } } ///  /// Identifies the Font dependency property. ///  public static readonly DependencyProperty FontProperty = DependencyProperty.Register( "Font", typeof(FontFamily), typeof(OutlinedText), new FrameworkPropertyMetadata( new FontFamily("Arial"), FrameworkPropertyMetadataOptions.AffectsRender, new PropertyChangedCallback(OnOutlineTextInvalidated), null ) ); ///  /// The current font size. ///  public double FontSize { get { return (double)GetValue(FontSizeProperty); } set { SetValue(FontSizeProperty, value); } } ///  /// Identifies the FontSize dependency property. ///  public static readonly DependencyProperty FontSizeProperty = DependencyProperty.Register( "FontSize", typeof(double), typeof(OutlinedText), new FrameworkPropertyMetadata( (double)48.0, FrameworkPropertyMetadataOptions.AffectsRender, new PropertyChangedCallback(OnOutlineTextInvalidated), null ) ); ///  /// Specifies whether the font should display Italic font style. ///  public bool Italic { get { return (bool)GetValue(ItalicProperty); } set { SetValue(ItalicProperty, value); } } ///  /// Identifies the Italic dependency property. ///  public static readonly DependencyProperty ItalicProperty = DependencyProperty.Register( "Italic", typeof(bool), typeof(OutlinedText), new FrameworkPropertyMetadata( false, FrameworkPropertyMetadataOptions.AffectsRender, new PropertyChangedCallback(OnOutlineTextInvalidated), null ) ); ///  /// Specifies the brush to use for the stroke and optional hightlight of the formatted text. ///  public Brush Stroke { get { return (Brush)GetValue(StrokeProperty); } set { SetValue(StrokeProperty, value); } } ///  /// Identifies the Stroke dependency property. ///  public static readonly DependencyProperty StrokeProperty = DependencyProperty.Register( "Stroke", typeof(Brush), typeof(OutlinedText), new FrameworkPropertyMetadata( new SolidColorBrush(Colors.Teal), FrameworkPropertyMetadataOptions.AffectsRender, new PropertyChangedCallback(OnOutlineTextInvalidated), null ) ); ///  /// The stroke thickness of the font. ///  public ushort StrokeThickness { get { return (ushort)GetValue(StrokeThicknessProperty); } set { SetValue(StrokeThicknessProperty, value); } } ///  /// Identifies the StrokeThickness dependency property. ///  public static readonly DependencyProperty StrokeThicknessProperty = DependencyProperty.Register( "StrokeThickness", typeof(ushort), typeof(OutlinedText), new FrameworkPropertyMetadata( (ushort)0, FrameworkPropertyMetadataOptions.AffectsRender, new PropertyChangedCallback(OnOutlineTextInvalidated), null ) ); ///  /// Specifies the text string to display. ///  public string Text { get { return (string)GetValue(TextProperty); } set { SetValue(TextProperty, value); } } ///  /// Identifies the Text dependency property. ///  public static readonly DependencyProperty TextProperty = DependencyProperty.Register( "Text", typeof(string), typeof(OutlinedText), new FrameworkPropertyMetadata( "", FrameworkPropertyMetadataOptions.AffectsRender, new PropertyChangedCallback(OnOutlineTextInvalidated), null ) ); public void AddChild(Object value) { } public void AddText(string value) { Text = value; } #endregion } } 

Você pode referenciá-lo no seu xaml.

      

Eu modifiquei a resposta mais votada com várias correções, incluindo:

  • Corrija os textos com uma única linha quando usar o UseLayoutRounding.

  • Os contornos mostrariam fora do texto em vez de no meio da borda.

  • A caneta é criada apenas uma vez em vez de em cada renderização.

  • Corrija para que ele não trave quando o texto estiver definido como nulo.

  • Corrija de modo que o contorno use capas redondas adequadas.

 using System; using System.ComponentModel; using System.Globalization; using System.Windows; using System.Windows.Documents; using System.Windows.Markup; using System.Windows.Media; [ContentProperty("Text")] public class OutlinedTextBlock : FrameworkElement { private void UpdatePen() { _Pen = new Pen(Stroke, StrokeThickness) { DashCap = PenLineCap.Round, EndLineCap = PenLineCap.Round, LineJoin = PenLineJoin.Round, StartLineCap = PenLineCap.Round }; InvalidateVisual(); } public static readonly DependencyProperty FillProperty = DependencyProperty.Register( "Fill", typeof(Brush), typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(Brushes.Black, FrameworkPropertyMetadataOptions.AffectsRender)); public static readonly DependencyProperty StrokeProperty = DependencyProperty.Register( "Stroke", typeof(Brush), typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(Brushes.Black, FrameworkPropertyMetadataOptions.AffectsRender, StrokePropertyChangedCallback)); private static void StrokePropertyChangedCallback(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs dependencyPropertyChangedEventArgs) { (dependencyObject as OutlinedTextBlock)?.UpdatePen(); } public static readonly DependencyProperty StrokeThicknessProperty = DependencyProperty.Register( "StrokeThickness", typeof(double), typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(1d, FrameworkPropertyMetadataOptions.AffectsRender, StrokePropertyChangedCallback)); public static readonly DependencyProperty FontFamilyProperty = TextElement.FontFamilyProperty.AddOwner( typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(OnFormattedTextUpdated)); public static readonly DependencyProperty FontSizeProperty = TextElement.FontSizeProperty.AddOwner( typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(OnFormattedTextUpdated)); public static readonly DependencyProperty FontStretchProperty = TextElement.FontStretchProperty.AddOwner( typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(OnFormattedTextUpdated)); public static readonly DependencyProperty FontStyleProperty = TextElement.FontStyleProperty.AddOwner( typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(OnFormattedTextUpdated)); public static readonly DependencyProperty FontWeightProperty = TextElement.FontWeightProperty.AddOwner( typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(OnFormattedTextUpdated)); public static readonly DependencyProperty TextProperty = DependencyProperty.Register( "Text", typeof(string), typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(OnFormattedTextInvalidated)); public static readonly DependencyProperty TextAlignmentProperty = DependencyProperty.Register( "TextAlignment", typeof(TextAlignment), typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(OnFormattedTextUpdated)); public static readonly DependencyProperty TextDecorationsProperty = DependencyProperty.Register( "TextDecorations", typeof(TextDecorationCollection), typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(OnFormattedTextUpdated)); public static readonly DependencyProperty TextTrimmingProperty = DependencyProperty.Register( "TextTrimming", typeof(TextTrimming), typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(OnFormattedTextUpdated)); public static readonly DependencyProperty TextWrappingProperty = DependencyProperty.Register( "TextWrapping", typeof(TextWrapping), typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(TextWrapping.NoWrap, OnFormattedTextUpdated)); private FormattedText _FormattedText; private Geometry _TextGeometry; private Pen _Pen; public Brush Fill { get { return (Brush)GetValue(FillProperty); } set { SetValue(FillProperty, value); } } public FontFamily FontFamily { get { return (FontFamily)GetValue(FontFamilyProperty); } set { SetValue(FontFamilyProperty, value); } } [TypeConverter(typeof(FontSizeConverter))] public double FontSize { get { return (double)GetValue(FontSizeProperty); } set { SetValue(FontSizeProperty, value); } } public FontStretch FontStretch { get { return (FontStretch)GetValue(FontStretchProperty); } set { SetValue(FontStretchProperty, value); } } public FontStyle FontStyle { get { return (FontStyle)GetValue(FontStyleProperty); } set { SetValue(FontStyleProperty, value); } } public FontWeight FontWeight { get { return (FontWeight)GetValue(FontWeightProperty); } set { SetValue(FontWeightProperty, value); } } public Brush Stroke { get { return (Brush)GetValue(StrokeProperty); } set { SetValue(StrokeProperty, value); } } public double StrokeThickness { get { return (double)GetValue(StrokeThicknessProperty); } set { SetValue(StrokeThicknessProperty, value); } } public string Text { get { return (string)GetValue(TextProperty); } set { SetValue(TextProperty, value); } } public TextAlignment TextAlignment { get { return (TextAlignment)GetValue(TextAlignmentProperty); } set { SetValue(TextAlignmentProperty, value); } } public TextDecorationCollection TextDecorations { get { return (TextDecorationCollection)GetValue(TextDecorationsProperty); } set { SetValue(TextDecorationsProperty, value); } } public TextTrimming TextTrimming { get { return (TextTrimming)GetValue(TextTrimmingProperty); } set { SetValue(TextTrimmingProperty, value); } } public TextWrapping TextWrapping { get { return (TextWrapping)GetValue(TextWrappingProperty); } set { SetValue(TextWrappingProperty, value); } } public OutlinedTextBlock() { UpdatePen(); TextDecorations = new TextDecorationCollection(); } protected override void OnRender(DrawingContext drawingContext) { EnsureGeometry(); drawingContext.DrawGeometry(null, _Pen, _TextGeometry); drawingContext.DrawGeometry(Fill, null, _TextGeometry); } protected override Size MeasureOverride(Size availableSize) { EnsureFormattedText(); // constrain the formatted text according to the available size double w = availableSize.Width; double h = availableSize.Height; // the Math.Min call is important - without this constraint (which seems arbitrary, but is the maximum allowable text width), things blow up when availableSize is infinite in both directions // the Math.Max call is to ensure we don't hit zero, which will cause MaxTextHeight to throw _FormattedText.MaxTextWidth = Math.Min(3579139, w); _FormattedText.MaxTextHeight = Math.Max(0.0001d, h); // return the desired size return new Size(Math.Ceiling(_FormattedText.Width), Math.Ceiling(_FormattedText.Height)); } protected override Size ArrangeOverride(Size finalSize) { EnsureFormattedText(); // update the formatted text with the final size _FormattedText.MaxTextWidth = finalSize.Width; _FormattedText.MaxTextHeight = Math.Max(0.0001d, finalSize.Height); // need to re-generate the geometry now that the dimensions have changed _TextGeometry = null; return finalSize; } private static void OnFormattedTextInvalidated(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs e) { var outlinedTextBlock = (OutlinedTextBlock)dependencyObject; outlinedTextBlock._FormattedText = null; outlinedTextBlock._TextGeometry = null; outlinedTextBlock.InvalidateMeasure(); outlinedTextBlock.InvalidateVisual(); } private static void OnFormattedTextUpdated(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs e) { var outlinedTextBlock = (OutlinedTextBlock)dependencyObject; outlinedTextBlock.UpdateFormattedText(); outlinedTextBlock._TextGeometry = null; outlinedTextBlock.InvalidateMeasure(); outlinedTextBlock.InvalidateVisual(); } private void EnsureFormattedText() { if (_FormattedText != null) { return; } _FormattedText = new FormattedText( Text ?? "", CultureInfo.CurrentUICulture, FlowDirection, new Typeface(FontFamily, FontStyle, FontWeight, FontStretch), FontSize, Brushes.Black); UpdateFormattedText(); } private void UpdateFormattedText() { if (_FormattedText == null) { return; } _FormattedText.MaxLineCount = TextWrapping == TextWrapping.NoWrap ? 1 : int.MaxValue; _FormattedText.TextAlignment = TextAlignment; _FormattedText.Trimming = TextTrimming; _FormattedText.SetFontSize(FontSize); _FormattedText.SetFontStyle(FontStyle); _FormattedText.SetFontWeight(FontWeight); _FormattedText.SetFontFamily(FontFamily); _FormattedText.SetFontStretch(FontStretch); _FormattedText.SetTextDecorations(TextDecorations); } private void EnsureGeometry() { if (_TextGeometry != null) { return; } EnsureFormattedText(); _TextGeometry = _FormattedText.BuildGeometry(new Point(0, 0)); } } 

você deve embrulhar o TextBlock com uma borda … algo como isto:

   My fancy TextBlock  

na chance de que você está perguntando como colocar um traçado em torno das letras reais (e não o TextBlock inteiro) você pode querer olhar usando um BitmapEffect de Glow e definindo os parâmetros no Glow para ser a cor do traço que você deseja, etc Caso contrário, você pode ter que criar algo personalizado.

“Como: criar texto esboçado” no MSDN tem todas as informações que você precisa.

Eu modifiquei @Javier G. resposta

  • A posição do traçado pode ser: central, externa ou interna; o padrão é externo.

  • O preenchimento pode ser transparente.

Centro:

insira a descrição da imagem aqui

Lado de fora:

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Dentro:

insira a descrição da imagem aqui

Código:

 using System; using System.ComponentModel; using System.Globalization; using System.Windows; using System.Windows.Documents; using System.Windows.Markup; using System.Windows.Media; namespace WpfApp2 { public enum StrokePosition { Center, Outside, Inside } [ContentProperty("Text")] public class OutlinedTextBlock : FrameworkElement { private void UpdatePen() { _Pen = new Pen(Stroke, StrokeThickness) { DashCap = PenLineCap.Round, EndLineCap = PenLineCap.Round, LineJoin = PenLineJoin.Round, StartLineCap = PenLineCap.Round }; if (StrokePosition == StrokePosition.Outside || StrokePosition == StrokePosition.Inside) { _Pen.Thickness = StrokeThickness * 2; } InvalidateVisual(); } public StrokePosition StrokePosition { get { return (StrokePosition)GetValue(StrokePositionProperty); } set { SetValue(StrokePositionProperty, value); } } public static readonly DependencyProperty StrokePositionProperty = DependencyProperty.Register("StrokePosition", typeof(StrokePosition), typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(StrokePosition.Outside, FrameworkPropertyMetadataOptions.AffectsRender)); public static readonly DependencyProperty FillProperty = DependencyProperty.Register( "Fill", typeof(Brush), typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(Brushes.Black, FrameworkPropertyMetadataOptions.AffectsRender)); public static readonly DependencyProperty StrokeProperty = DependencyProperty.Register( "Stroke", typeof(Brush), typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(Brushes.Black, FrameworkPropertyMetadataOptions.AffectsRender)); public static readonly DependencyProperty StrokeThicknessProperty = DependencyProperty.Register( "StrokeThickness", typeof(double), typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(1d, FrameworkPropertyMetadataOptions.AffectsRender)); public static readonly DependencyProperty FontFamilyProperty = TextElement.FontFamilyProperty.AddOwner( typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(OnFormattedTextUpdated)); public static readonly DependencyProperty FontSizeProperty = TextElement.FontSizeProperty.AddOwner( typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(OnFormattedTextUpdated)); public static readonly DependencyProperty FontStretchProperty = TextElement.FontStretchProperty.AddOwner( typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(OnFormattedTextUpdated)); public static readonly DependencyProperty FontStyleProperty = TextElement.FontStyleProperty.AddOwner( typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(OnFormattedTextUpdated)); public static readonly DependencyProperty FontWeightProperty = TextElement.FontWeightProperty.AddOwner( typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(OnFormattedTextUpdated)); public static readonly DependencyProperty TextProperty = DependencyProperty.Register( "Text", typeof(string), typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(OnFormattedTextInvalidated)); public static readonly DependencyProperty TextAlignmentProperty = DependencyProperty.Register( "TextAlignment", typeof(TextAlignment), typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(OnFormattedTextUpdated)); public static readonly DependencyProperty TextDecorationsProperty = DependencyProperty.Register( "TextDecorations", typeof(TextDecorationCollection), typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(OnFormattedTextUpdated)); public static readonly DependencyProperty TextTrimmingProperty = DependencyProperty.Register( "TextTrimming", typeof(TextTrimming), typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(OnFormattedTextUpdated)); public static readonly DependencyProperty TextWrappingProperty = DependencyProperty.Register( "TextWrapping", typeof(TextWrapping), typeof(OutlinedTextBlock), new FrameworkPropertyMetadata(TextWrapping.NoWrap, OnFormattedTextUpdated)); private FormattedText _FormattedText; private Geometry _TextGeometry; private Pen _Pen; private PathGeometry _clipGeometry; public Brush Fill { get { return (Brush)GetValue(FillProperty); } set { SetValue(FillProperty, value); } } public FontFamily FontFamily { get { return (FontFamily)GetValue(FontFamilyProperty); } set { SetValue(FontFamilyProperty, value); } } [TypeConverter(typeof(FontSizeConverter))] public double FontSize { get { return (double)GetValue(FontSizeProperty); } set { SetValue(FontSizeProperty, value); } } public FontStretch FontStretch { get { return (FontStretch)GetValue(FontStretchProperty); } set { SetValue(FontStretchProperty, value); } } public FontStyle FontStyle { get { return (FontStyle)GetValue(FontStyleProperty); } set { SetValue(FontStyleProperty, value); } } public FontWeight FontWeight { get { return (FontWeight)GetValue(FontWeightProperty); } set { SetValue(FontWeightProperty, value); } } public Brush Stroke { get { return (Brush)GetValue(StrokeProperty); } set { SetValue(StrokeProperty, value); } } public double StrokeThickness { get { return (double)GetValue(StrokeThicknessProperty); } set { SetValue(StrokeThicknessProperty, value); } } public string Text { get { return (string)GetValue(TextProperty); } set { SetValue(TextProperty, value); } } public TextAlignment TextAlignment { get { return (TextAlignment)GetValue(TextAlignmentProperty); } set { SetValue(TextAlignmentProperty, value); } } public TextDecorationCollection TextDecorations { get { return (TextDecorationCollection)GetValue(TextDecorationsProperty); } set { SetValue(TextDecorationsProperty, value); } } public TextTrimming TextTrimming { get { return (TextTrimming)GetValue(TextTrimmingProperty); } set { SetValue(TextTrimmingProperty, value); } } public TextWrapping TextWrapping { get { return (TextWrapping)GetValue(TextWrappingProperty); } set { SetValue(TextWrappingProperty, value); } } public OutlinedTextBlock() { UpdatePen(); TextDecorations = new TextDecorationCollection(); } protected override void OnRender(DrawingContext drawingContext) { EnsureGeometry(); drawingContext.DrawGeometry(Fill, null, _TextGeometry); if (StrokePosition == StrokePosition.Outside) { drawingContext.PushClip(_clipGeometry); } else if (StrokePosition == StrokePosition.Inside) { drawingContext.PushClip(_TextGeometry); } drawingContext.DrawGeometry(null, _Pen, _TextGeometry); if (StrokePosition == StrokePosition.Outside || StrokePosition == StrokePosition.Inside) { drawingContext.Pop(); } } protected override Size MeasureOverride(Size availableSize) { EnsureFormattedText(); // constrain the formatted text according to the available size double w = availableSize.Width; double h = availableSize.Height; // the Math.Min call is important - without this constraint (which seems arbitrary, but is the maximum allowable text width), things blow up when availableSize is infinite in both directions // the Math.Max call is to ensure we don't hit zero, which will cause MaxTextHeight to throw _FormattedText.MaxTextWidth = Math.Min(3579139, w); _FormattedText.MaxTextHeight = Math.Max(0.0001d, h); // return the desired size return new Size(Math.Ceiling(_FormattedText.Width), Math.Ceiling(_FormattedText.Height)); } protected override Size ArrangeOverride(Size finalSize) { EnsureFormattedText(); // update the formatted text with the final size _FormattedText.MaxTextWidth = finalSize.Width; _FormattedText.MaxTextHeight = Math.Max(0.0001d, finalSize.Height); // need to re-generate the geometry now that the dimensions have changed _TextGeometry = null; UpdatePen(); return finalSize; } private static void OnFormattedTextInvalidated(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs e) { var outlinedTextBlock = (OutlinedTextBlock)dependencyObject; outlinedTextBlock._FormattedText = null; outlinedTextBlock._TextGeometry = null; outlinedTextBlock.InvalidateMeasure(); outlinedTextBlock.InvalidateVisual(); } private static void OnFormattedTextUpdated(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs e) { var outlinedTextBlock = (OutlinedTextBlock)dependencyObject; outlinedTextBlock.UpdateFormattedText(); outlinedTextBlock._TextGeometry = null; outlinedTextBlock.InvalidateMeasure(); outlinedTextBlock.InvalidateVisual(); } private void EnsureFormattedText() { if (_FormattedText != null) { return; } _FormattedText = new FormattedText( Text ?? "", CultureInfo.CurrentUICulture, FlowDirection, new Typeface(FontFamily, FontStyle, FontWeight, FontStretch), FontSize, Brushes.Black); UpdateFormattedText(); } private void UpdateFormattedText() { if (_FormattedText == null) { return; } _FormattedText.MaxLineCount = TextWrapping == TextWrapping.NoWrap ? 1 : int.MaxValue; _FormattedText.TextAlignment = TextAlignment; _FormattedText.Trimming = TextTrimming; _FormattedText.SetFontSize(FontSize); _FormattedText.SetFontStyle(FontStyle); _FormattedText.SetFontWeight(FontWeight); _FormattedText.SetFontFamily(FontFamily); _FormattedText.SetFontStretch(FontStretch); _FormattedText.SetTextDecorations(TextDecorations); } private void EnsureGeometry() { if (_TextGeometry != null) { return; } EnsureFormattedText(); _TextGeometry = _FormattedText.BuildGeometry(new Point(0, 0)); if (StrokePosition == StrokePosition.Outside) { var boundsGeo = new RectangleGeometry(new Rect(0, 0, ActualWidth, ActualHeight)); _clipGeometry = Geometry.Combine(boundsGeo, _TextGeometry, GeometryCombineMode.Exclude, null); } } } } 

Usege:

     

In Blend you could convert the TextBlock to a Path, and then use the normal Stroke properties. But I’m assuming you wanted something that you could make dynamic…

Otherwise I would think it would have to be some sort of bitmap effect or special brush.

Could just use a Label instead. It has more properties that you can play with. Exemplo:

   

If applied for anyone, here a simple solution using ONLY XAML. I am not sure if it performs better or worse, but in my opinion, it looks better then any other solution above. I wrap it in a ContentControl Style (and Template), following this Old School example 🙂 http://oldschooldotnet.blogspot.co.il/2009/02/fancy-fonts-in-xaml-silverlight-and-wpf.html

               

as already mentioned, convert text to path

 FormattedText t = new FormattedText ( "abcxyz", CultureInfo.GetCultureInfo("en-us"), FlowDirection.LeftToRight, new Typeface( new FontFamily("Arial"), new FontStyle(), new FontWeight(), new FontStretch()), 20, Brushes.Transparent ); Geometry g = t.BuildGeometry(new System.Windows.Point(0, 0)); Path p = new Path(); p.Fill = Brushes.White; p.Stroke = Brushes.Black; p.StrokeThickness = 1; p.Data = g; 

has no decorative attributes itself. I would put it on a with a and apply the stroke there.

This helped me out tremendously! Just in case anyone needs it in the future, here’s the VB version (made StrokeThickness a double and added an Underline property):

 Imports System Imports System.Windows.Media Imports System.Globalization Imports System.Windows Imports System.Windows.Markup Namespace CustomXaml Public Class OutlinedText Inherits FrameworkElement Implements IAddChild Private _textGeometry As Geometry Private Shared Sub OnOutlineTextInvalidated(d As DependencyObject, e As DependencyPropertyChangedEventArgs) DirectCast(d, OutlinedText).CreateText() End Sub Protected Overrides Sub OnRender(drawingContext As System.Windows.Media.DrawingContext) CreateText() drawingContext.DrawGeometry(Fill, New Pen(Stroke, StrokeThickness), _textGeometry) End Sub Public Sub CreateText() Dim fontStyle = FontStyles.Normal Dim fontWeight = FontWeights.Medium Dim fontDecoration = New TextDecorationCollection() If Bold Then fontWeight = FontWeights.Bold If Italic Then fontStyle = FontStyles.Italic If Underline Then fontDecoration.Add(TextDecorations.Underline) Dim formattedText = New FormattedText( _ Text, _ CultureInfo.GetCultureInfo("en-us"), _ FlowDirection.LeftToRight, _ New Typeface(Font, fontStyle, fontWeight, FontStretches.Normal), _ FontSize, _ Brushes.Black _ ) formattedText.SetTextDecorations(fontDecoration) _textGeometry = formattedText.BuildGeometry(New Point(0, 0)) Me.MinWidth = formattedText.Width Me.MinHeight = formattedText.Height End Sub Public Property Bold As Boolean Get Return CType(GetValue(BoldProperty), Boolean) End Get Set(value As Boolean) SetValue(BoldProperty, value) End Set End Property Public Shared ReadOnly BoldProperty As DependencyProperty = DependencyProperty.Register( _ "Bold", _ GetType(Boolean), _ GetType(OutlinedText), _ New FrameworkPropertyMetadata( _ False, _ FrameworkPropertyMetadataOptions.AffectsRender, _ New PropertyChangedCallback(AddressOf OnOutlineTextInvalidated), _ Nothing _ ) _ ) Public Property Underline As Boolean Get Return CType(GetValue(UnderlineProperty), Boolean) End Get Set(value As Boolean) SetValue(UnderlineProperty, value) End Set End Property Public Shared ReadOnly UnderlineProperty As DependencyProperty = DependencyProperty.Register( _ "Underline", _ GetType(Boolean), _ GetType(OutlinedText), _ New FrameworkPropertyMetadata( _ False, _ FrameworkPropertyMetadataOptions.AffectsRender, _ New PropertyChangedCallback(AddressOf OnOutlineTextInvalidated), _ Nothing _ ) _ ) Public Property Fill As Brush Get Return CType(GetValue(FillProperty), Brush) End Get Set(value As Brush) SetValue(FillProperty, value) End Set End Property Public Shared ReadOnly FillProperty As DependencyProperty = DependencyProperty.Register( _ "Fill", _ GetType(Brush), _ GetType(OutlinedText), _ New FrameworkPropertyMetadata( _ New SolidColorBrush(Colors.LightSteelBlue), _ FrameworkPropertyMetadataOptions.AffectsRender, _ New PropertyChangedCallback(AddressOf OnOutlineTextInvalidated), _ Nothing _ ) _ ) Public Property Font As FontFamily Get Return CType(GetValue(FontProperty), FontFamily) End Get Set(value As FontFamily) SetValue(FontProperty, value) End Set End Property Public Shared ReadOnly FontProperty As DependencyProperty = DependencyProperty.Register( _ "Font", _ GetType(FontFamily), _ GetType(OutlinedText), _ New FrameworkPropertyMetadata( _ New FontFamily("Arial"), _ FrameworkPropertyMetadataOptions.AffectsRender, _ New PropertyChangedCallback(AddressOf OnOutlineTextInvalidated), _ Nothing _ ) _ ) Public Property FontSize As Double Get Return CType(GetValue(FontSizeProperty), Double) End Get Set(value As Double) SetValue(FontSizeProperty, value) End Set End Property Public Shared ReadOnly FontSizeProperty As DependencyProperty = DependencyProperty.Register( _ "FontSize", _ GetType(Double), _ GetType(OutlinedText), _ New FrameworkPropertyMetadata( _ CDbl(48.0), _ FrameworkPropertyMetadataOptions.AffectsRender, _ New PropertyChangedCallback(AddressOf OnOutlineTextInvalidated), _ Nothing _ ) _ ) Public Property Italic As Boolean Get Return CType(GetValue(ItalicProperty), Boolean) End Get Set(value As Boolean) SetValue(ItalicProperty, value) End Set End Property Public Shared ReadOnly ItalicProperty As DependencyProperty = DependencyProperty.Register( _ "Italic", _ GetType(Boolean), _ GetType(OutlinedText), _ New FrameworkPropertyMetadata( _ False, _ FrameworkPropertyMetadataOptions.AffectsRender, _ New PropertyChangedCallback(AddressOf OnOutlineTextInvalidated), _ Nothing _ ) _ ) Public Property Stroke As Brush Get Return CType(GetValue(StrokeProperty), Brush) End Get Set(value As Brush) SetValue(StrokeProperty, value) End Set End Property Public Shared ReadOnly StrokeProperty As DependencyProperty = DependencyProperty.Register( _ "Stroke", _ GetType(Brush), _ GetType(OutlinedText), _ New FrameworkPropertyMetadata( _ New SolidColorBrush(Colors.Teal), _ FrameworkPropertyMetadataOptions.AffectsRender, _ New PropertyChangedCallback(AddressOf OnOutlineTextInvalidated), _ Nothing _ ) _ ) Public Property StrokeThickness As Double Get Return CType(GetValue(StrokeThicknessProperty), Double) End Get Set(value As Double) SetValue(StrokeThicknessProperty, value) End Set End Property Public Shared ReadOnly StrokeThicknessProperty As DependencyProperty = DependencyProperty.Register( _ "StrokeThickness", _ GetType(Double), _ GetType(OutlinedText), _ New FrameworkPropertyMetadata( _ CDbl(0), _ FrameworkPropertyMetadataOptions.AffectsRender, _ New PropertyChangedCallback(AddressOf OnOutlineTextInvalidated), _ Nothing _ ) _ ) Public Property Text As String Get Return CType(GetValue(TextProperty), String) End Get Set(value As String) SetValue(TextProperty, value) End Set End Property Public Shared ReadOnly TextProperty As DependencyProperty = DependencyProperty.Register( _ "Text", _ GetType(String), _ GetType(OutlinedText), _ New FrameworkPropertyMetadata( _ "", _ FrameworkPropertyMetadataOptions.AffectsRender, _ New PropertyChangedCallback(AddressOf OnOutlineTextInvalidated), _ Nothing _ ) _ ) Public Sub AddChild(value As Object) Implements System.Windows.Markup.IAddChild.AddChild End Sub Public Sub AddText(text As String) Implements System.Windows.Markup.IAddChild.AddText Me.Text = text End Sub End Class End Namespace 

I was using Kent’s solution in my custom control. It resulted in a null exception when using templatebinding against the text property.

I had to modify the MeasureOverride function like so:

  protected override Size MeasureOverride(Size availableSize) { this.EnsureFormattedText(); if (this.formattedText == null) { this.formattedText = new FormattedText( (this.Text == null) ? "" : this.Text, CultureInfo.CurrentUICulture, this.FlowDirection, new Typeface(this.FontFamily, this.FontStyle, this.FontWeight, FontStretches.Normal), this.FontSize, Brushes.Black); } // constrain the formatted text according to the available size // the Math.Min call is important - without this constraint (which seems arbitrary, but is the maximum allowable text width), things blow up when availableSize is infinite in both directions this.formattedText.MaxTextWidth = Math.Min(3579139, availableSize.Width); this.formattedText.MaxTextHeight = availableSize.Height; // return the desired size return new Size(this.formattedText.Width, this.formattedText.Height); } 

It should be noted that I did not thoroughly test this.

Slight modification to Kent Boogaart’s code which, while awesome, is missing a small detail. This is probably a little inaccurate in that it will only measure the fill and not the stroke but adding a couple of lines to OnRender() Viewbox will be able to get a handle on what to do with it (although, as with TextBox , not in preview).

 protected override void OnRender(DrawingContext drawingContext) { this.EnsureGeometry(); this.Width = this.formattedText.Width; this.Height = this.formattedText.Height; drawingContext.DrawGeometry(this.Fill, new Pen(this.Stroke, this.StrokeThickness), this.textGeometry); } 

I’m using this with two layers of text so the stroke appears to only be around the outside as follows. This will obviously not work straight away as it refers to specific images and fonts.

               

I was trying to achieve something similar to this as well. The classs mentioned here were great, but weren’t exactly what I was looking for, because it only really looked right if the text was large enough. The text I was trying to display was around 10 – 11 font size, and the stroke was so large the letters sort of blended together.

Just to clarify, this text was supposed to be overlaid on a user-defined picture, which could have varying colors, and I wanted to ensure this text would show up.

I don’t know if this is best practice or not, but this at least achieved the look I wanted (based on this article ):

   

Then for the actual TextBlocks, I combined two Outer styled TextBlocks because one was too light, and one Inner styled TextBlock:

      

Alternatively, you could use the DropShadowEffect, which looked okay with using only two textboxes (although adding more DropShadowEffects with varying directions and lowered opacity may look even better):

             

I had to add this to MeasureOverride so it would show single lines of text while using layout rounding. It worked fine when the text was wrapping though.

 // return the desired size return new Size(Math.Ceiling(_FormattedText.Width), Math.Ceiling(_FormattedText.Height));