Benedikt Stebner
4 years ago
85 changed files with 2332 additions and 1271 deletions
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<UserControl xmlns="https://github.com/avaloniaui" |
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" |
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xmlns:d="http://schemas.microsoft.com/expression/blend/2008" |
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xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" |
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mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450" |
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x:Class="RenderDemo.Pages.TextFormatterPage"> |
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</UserControl> |
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using System; |
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using Avalonia; |
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using Avalonia.Controls; |
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using Avalonia.Markup.Xaml; |
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using Avalonia.Media; |
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using Avalonia.Media.TextFormatting; |
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namespace RenderDemo.Pages |
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{ |
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public class TextFormatterPage : UserControl |
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{ |
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private TextLine _textLine; |
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public TextFormatterPage() |
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{ |
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this.InitializeComponent(); |
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} |
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private void InitializeComponent() |
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{ |
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AvaloniaXamlLoader.Load(this); |
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} |
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public override void Render(DrawingContext context) |
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{ |
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_textLine?.Draw(context, new Point()); |
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} |
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protected override Size MeasureOverride(Size availableSize) |
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{ |
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var defaultRunProperties = new GenericTextRunProperties(Typeface.Default, foregroundBrush: Brushes.Black, |
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baselineAlignment: BaselineAlignment.Center); |
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var paragraphProperties = new GenericTextParagraphProperties(defaultRunProperties); |
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var control = new Button { Content = new TextBlock { Text = "ClickMe" } }; |
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Content = control; |
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var textSource = new CustomTextSource(control, defaultRunProperties); |
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control.Measure(Size.Infinity); |
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_textLine = |
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TextFormatter.Current.FormatLine(textSource, 0, double.PositiveInfinity, paragraphProperties); |
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return base.MeasureOverride(availableSize); |
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} |
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protected override Size ArrangeOverride(Size finalSize) |
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{ |
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var currentX = 0d; |
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foreach (var textRun in _textLine.TextRuns) |
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{ |
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if (textRun is ControlRun controlRun) |
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{ |
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controlRun.Control.Arrange(new Rect(new Point(currentX, 0), controlRun.Size)); |
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} |
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if (textRun is DrawableTextRun drawableTextRun) |
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{ |
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currentX += drawableTextRun.Size.Width; |
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} |
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} |
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return finalSize; |
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} |
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private class CustomTextSource : ITextSource |
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{ |
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private readonly Control _control; |
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private readonly TextRunProperties _defaultProperties; |
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private readonly string _text = "<-Hello World->"; |
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public CustomTextSource(Control control, TextRunProperties defaultProperties) |
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{ |
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_control = control; |
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_defaultProperties = defaultProperties; |
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} |
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public TextRun? GetTextRun(int textSourceIndex) |
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{ |
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if (textSourceIndex >= _text.Length * 2 + TextRun.DefaultTextSourceLength) |
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{ |
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return null; |
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} |
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if (textSourceIndex == _text.Length) |
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{ |
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return new ControlRun(_control, _defaultProperties); |
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} |
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return new TextCharacters(_text.AsMemory(), _defaultProperties); |
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} |
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} |
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private class ControlRun : DrawableTextRun |
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{ |
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private readonly Control _control; |
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public ControlRun(Control control, TextRunProperties properties) |
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{ |
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_control = control; |
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Properties = properties; |
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} |
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public Control Control => _control; |
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public override Size Size => _control.DesiredSize; |
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public override double Baseline => 0; |
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public override TextRunProperties? Properties { get; } |
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public override void Draw(DrawingContext drawingContext, Point origin) |
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{ |
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// noop
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} |
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} |
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} |
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} |
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using System.Collections.Generic; |
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namespace Avalonia.Media.TextFormatting |
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{ |
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/// <summary>
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/// The bounding rectangle of a range of characters
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/// </summary>
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public sealed class TextBounds |
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{ |
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/// <summary>
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/// Constructing TextBounds object
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/// </summary>
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internal TextBounds(Rect bounds, FlowDirection flowDirection) |
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{ |
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Rectangle = bounds; |
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FlowDirection = flowDirection; |
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} |
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/// <summary>
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/// Bounds rectangle
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/// </summary>
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public Rect Rectangle { get; } |
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/// <summary>
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/// Text flow direction inside the boundary rectangle
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/// </summary>
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public FlowDirection FlowDirection { get; } |
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} |
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} |
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using System.Globalization; |
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namespace Avalonia.Media.TextFormatting |
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{ |
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/// <summary>
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/// Options to customize text shaping.
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/// </summary>
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public readonly struct TextShaperOptions |
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{ |
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public TextShaperOptions( |
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GlyphTypeface typeface, |
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double fontRenderingEmSize = 12, |
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sbyte bidiLevel = 0, |
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CultureInfo? culture = null, |
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double incrementalTabWidth = 0) |
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{ |
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Typeface = typeface; |
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FontRenderingEmSize = fontRenderingEmSize; |
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BidLevel = bidiLevel; |
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Culture = culture; |
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IncrementalTabWidth = incrementalTabWidth; |
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} |
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/// <summary>
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/// Get the typeface.
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/// </summary>
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public GlyphTypeface Typeface { get; } |
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/// <summary>
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/// Get the font rendering em size.
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/// </summary>
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public double FontRenderingEmSize { get; } |
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/// <summary>
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/// Get the bidi level of the text.
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/// </summary>
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public sbyte BidLevel { get; } |
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/// <summary>
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/// Get the culture.
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/// </summary>
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public CultureInfo? Culture { get; } |
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/// <summary>
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/// Get the incremental tab width.
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/// </summary>
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public double IncrementalTabWidth { get; } |
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} |
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} |
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