Apply stroke to a textblock
03/04/2020
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find on https://stackoverflow.com/questions/93650/apply-stroke-to-a-textblock-in-wpf
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using System; using System.Collections.Generic; using System.ComponentModel; using System.Globalization; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows; using System.Windows.Documents; using System.Windows.Markup; using System.Windows.Media; namespace MyNotes { [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)); } } } |
and use with
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<local:OutlinedTextBlock Text="Enregistré" Fill="Green" Stroke="White" StrokeThickness="0.5" FontSize="25" HorizontalAlignment="Center" Margin="0 -5 0 0" FontWeight="Bold" /> |
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