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