Initial commit: .NET MAUI Linux Platform
Complete Linux platform implementation for .NET MAUI with:
- 35+ Skia-rendered controls (Button, Label, Entry, CarouselView, etc.)
- Platform services (Clipboard, FilePicker, Notifications, DragDrop, etc.)
- Accessibility support (AT-SPI2, High Contrast)
- HiDPI and Input Method support
- 216 unit tests
- CI/CD workflows
- Project templates
- Documentation
🤖 Generated with Claude Code
This commit is contained in:
logikonline
331
Views/SkiaLabel.cs
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331
Views/SkiaLabel.cs
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// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT license.
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using SkiaSharp;
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using Microsoft.Maui.Platform.Linux.Rendering;
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namespace Microsoft.Maui.Platform;
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/// <summary>
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/// Skia-rendered label control for displaying text.
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/// </summary>
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public class SkiaLabel : SkiaView
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{
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public string Text { get; set; } = "";
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public SKColor TextColor { get; set; } = SKColors.Black;
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public string FontFamily { get; set; } = "Sans";
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public float FontSize { get; set; } = 14;
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public bool IsBold { get; set; }
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public bool IsItalic { get; set; }
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public bool IsUnderline { get; set; }
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public bool IsStrikethrough { get; set; }
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public TextAlignment HorizontalTextAlignment { get; set; } = TextAlignment.Start;
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public TextAlignment VerticalTextAlignment { get; set; } = TextAlignment.Center;
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public LineBreakMode LineBreakMode { get; set; } = LineBreakMode.TailTruncation;
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public int MaxLines { get; set; } = 0; // 0 = unlimited
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public float LineHeight { get; set; } = 1.2f;
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public float CharacterSpacing { get; set; }
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public SkiaTextAlignment HorizontalAlignment
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{
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get => HorizontalTextAlignment switch
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{
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TextAlignment.Start => SkiaTextAlignment.Left,
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TextAlignment.Center => SkiaTextAlignment.Center,
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TextAlignment.End => SkiaTextAlignment.Right,
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_ => SkiaTextAlignment.Left
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};
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set => HorizontalTextAlignment = value switch
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{
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SkiaTextAlignment.Left => TextAlignment.Start,
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SkiaTextAlignment.Center => TextAlignment.Center,
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SkiaTextAlignment.Right => TextAlignment.End,
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_ => TextAlignment.Start
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};
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}
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public SkiaVerticalAlignment VerticalAlignment
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{
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get => VerticalTextAlignment switch
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{
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TextAlignment.Start => SkiaVerticalAlignment.Top,
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TextAlignment.Center => SkiaVerticalAlignment.Center,
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TextAlignment.End => SkiaVerticalAlignment.Bottom,
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_ => SkiaVerticalAlignment.Top
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};
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set => VerticalTextAlignment = value switch
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{
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SkiaVerticalAlignment.Top => TextAlignment.Start,
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SkiaVerticalAlignment.Center => TextAlignment.Center,
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SkiaVerticalAlignment.Bottom => TextAlignment.End,
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_ => TextAlignment.Start
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};
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}
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public SKRect Padding { get; set; } = new SKRect(0, 0, 0, 0);
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protected override void OnDraw(SKCanvas canvas, SKRect bounds)
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{
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if (string.IsNullOrEmpty(Text))
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return;
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var fontStyle = new SKFontStyle(
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IsBold ? SKFontStyleWeight.Bold : SKFontStyleWeight.Normal,
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SKFontStyleWidth.Normal,
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IsItalic ? SKFontStyleSlant.Italic : SKFontStyleSlant.Upright);
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var typeface = SkiaRenderingEngine.Current?.ResourceCache.GetTypeface(FontFamily, fontStyle)
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?? SKTypeface.Default;
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using var font = new SKFont(typeface, FontSize);
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using var paint = new SKPaint(font)
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{
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Color = IsEnabled ? TextColor : TextColor.WithAlpha(128),
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IsAntialias = true
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};
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// Calculate content bounds with padding
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var contentBounds = new SKRect(
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bounds.Left + Padding.Left,
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bounds.Top + Padding.Top,
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bounds.Right - Padding.Right,
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bounds.Bottom - Padding.Bottom);
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// Handle single line vs multiline
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if (MaxLines == 1 || !Text.Contains('\n'))
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{
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DrawSingleLine(canvas, paint, font, contentBounds);
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}
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else
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{
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DrawMultiLine(canvas, paint, font, contentBounds);
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}
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}
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private void DrawSingleLine(SKCanvas canvas, SKPaint paint, SKFont font, SKRect bounds)
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{
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var displayText = Text;
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// Measure text
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var textBounds = new SKRect();
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paint.MeasureText(displayText, ref textBounds);
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// Apply truncation if needed
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if (textBounds.Width > bounds.Width && LineBreakMode == LineBreakMode.TailTruncation)
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{
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displayText = TruncateText(paint, displayText, bounds.Width);
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paint.MeasureText(displayText, ref textBounds);
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}
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// Calculate position based on alignment
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float x = HorizontalTextAlignment switch
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{
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TextAlignment.Start => bounds.Left,
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TextAlignment.Center => bounds.MidX - textBounds.Width / 2,
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TextAlignment.End => bounds.Right - textBounds.Width,
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_ => bounds.Left
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};
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float y = VerticalTextAlignment switch
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{
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TextAlignment.Start => bounds.Top - textBounds.Top,
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TextAlignment.Center => bounds.MidY - textBounds.MidY,
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TextAlignment.End => bounds.Bottom - textBounds.Bottom,
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_ => bounds.MidY - textBounds.MidY
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};
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canvas.DrawText(displayText, x, y, paint);
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// Draw underline if needed
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if (IsUnderline)
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{
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using var linePaint = new SKPaint
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{
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Color = paint.Color,
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StrokeWidth = 1,
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IsAntialias = true
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};
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var underlineY = y + 2;
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canvas.DrawLine(x, underlineY, x + textBounds.Width, underlineY, linePaint);
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}
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// Draw strikethrough if needed
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if (IsStrikethrough)
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{
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using var linePaint = new SKPaint
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{
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Color = paint.Color,
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StrokeWidth = 1,
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IsAntialias = true
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};
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var strikeY = y - textBounds.Height / 3;
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canvas.DrawLine(x, strikeY, x + textBounds.Width, strikeY, linePaint);
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}
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}
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private void DrawMultiLine(SKCanvas canvas, SKPaint paint, SKFont font, SKRect bounds)
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{
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var lines = Text.Split('\n');
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var lineSpacing = FontSize * LineHeight;
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var maxLinesToDraw = MaxLines > 0 ? Math.Min(MaxLines, lines.Length) : lines.Length;
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// Calculate total height
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var totalHeight = maxLinesToDraw * lineSpacing;
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// Calculate starting Y based on vertical alignment
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float startY = VerticalTextAlignment switch
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{
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TextAlignment.Start => bounds.Top + FontSize,
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TextAlignment.Center => bounds.MidY - totalHeight / 2 + FontSize,
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TextAlignment.End => bounds.Bottom - totalHeight + FontSize,
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_ => bounds.Top + FontSize
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};
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for (int i = 0; i < maxLinesToDraw; i++)
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{
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var line = lines[i];
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// Add ellipsis if this is the last line and there are more
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if (i == maxLinesToDraw - 1 && i < lines.Length - 1 && LineBreakMode == LineBreakMode.TailTruncation)
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{
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line = TruncateText(paint, line, bounds.Width);
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}
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var textBounds = new SKRect();
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paint.MeasureText(line, ref textBounds);
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float x = HorizontalTextAlignment switch
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{
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TextAlignment.Start => bounds.Left,
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TextAlignment.Center => bounds.MidX - textBounds.Width / 2,
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TextAlignment.End => bounds.Right - textBounds.Width,
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_ => bounds.Left
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};
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float y = startY + i * lineSpacing;
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if (y > bounds.Bottom)
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break;
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canvas.DrawText(line, x, y, paint);
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}
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}
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private string TruncateText(SKPaint paint, string text, float maxWidth)
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{
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const string ellipsis = "...";
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var ellipsisWidth = paint.MeasureText(ellipsis);
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if (paint.MeasureText(text) <= maxWidth)
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return text;
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var availableWidth = maxWidth - ellipsisWidth;
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if (availableWidth <= 0)
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return ellipsis;
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// Binary search for the right length
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int low = 0;
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int high = text.Length;
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while (low < high)
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{
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int mid = (low + high + 1) / 2;
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var substring = text.Substring(0, mid);
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if (paint.MeasureText(substring) <= availableWidth)
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low = mid;
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else
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high = mid - 1;
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}
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return text.Substring(0, low) + ellipsis;
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}
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protected override SKSize MeasureOverride(SKSize availableSize)
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{
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if (string.IsNullOrEmpty(Text))
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{
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return new SKSize(
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Padding.Left + Padding.Right,
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FontSize + Padding.Top + Padding.Bottom);
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}
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var fontStyle = new SKFontStyle(
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IsBold ? SKFontStyleWeight.Bold : SKFontStyleWeight.Normal,
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SKFontStyleWidth.Normal,
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IsItalic ? SKFontStyleSlant.Italic : SKFontStyleSlant.Upright);
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var typeface = SkiaRenderingEngine.Current?.ResourceCache.GetTypeface(FontFamily, fontStyle)
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?? SKTypeface.Default;
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using var font = new SKFont(typeface, FontSize);
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using var paint = new SKPaint(font);
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if (MaxLines == 1 || !Text.Contains('\n'))
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{
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var textBounds = new SKRect();
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paint.MeasureText(Text, ref textBounds);
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return new SKSize(
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textBounds.Width + Padding.Left + Padding.Right,
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textBounds.Height + Padding.Top + Padding.Bottom);
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}
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else
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{
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var lines = Text.Split('\n');
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var maxLinesToMeasure = MaxLines > 0 ? Math.Min(MaxLines, lines.Length) : lines.Length;
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float maxWidth = 0;
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foreach (var line in lines.Take(maxLinesToMeasure))
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{
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maxWidth = Math.Max(maxWidth, paint.MeasureText(line));
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}
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var totalHeight = maxLinesToMeasure * FontSize * LineHeight;
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return new SKSize(
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maxWidth + Padding.Left + Padding.Right,
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totalHeight + Padding.Top + Padding.Bottom);
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}
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}
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}
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/// <summary>
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/// Text alignment options.
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/// </summary>
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public enum TextAlignment
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{
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Start,
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Center,
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End
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}
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/// <summary>
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/// Line break mode options.
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/// </summary>
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public enum LineBreakMode
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{
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NoWrap,
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WordWrap,
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CharacterWrap,
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HeadTruncation,
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TailTruncation,
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MiddleTruncation
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}
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/// <summary>
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/// Horizontal text alignment for Skia label.
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/// </summary>
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public enum SkiaTextAlignment
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{
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Left,
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Center,
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Right
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}
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/// <summary>
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/// Vertical text alignment for Skia label.
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/// </summary>
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public enum SkiaVerticalAlignment
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{
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Top,
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Center,
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Bottom
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}
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