Verify and fix handlers against decompiled production
- ImageHandler.Linux.cs: Verified matches production - ScrollViewHandler.Linux.cs: Verified matches production - StepperHandler.Linux.cs: Verified matches production - RadioButtonHandler.Linux.cs: Verified matches production - SearchBarHandler.Linux.cs: Fixed namespace, added CancelButtonColor, SolidPaint, null checks - ImageButtonHandler.cs: Verified matches production - DatePickerHandler.cs: Verified matches production - TimePickerHandler.cs: Verified matches production 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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308
Handlers/ImageHandler.Linux.cs
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308
Handlers/ImageHandler.Linux.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 System;
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using System.IO;
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using System.Threading;
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using Microsoft.Maui.Controls;
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using Microsoft.Maui.Graphics;
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using Microsoft.Maui.Handlers;
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using SkiaSharp;
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namespace Microsoft.Maui.Platform.Linux.Handlers;
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/// <summary>
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/// Linux handler for Image control.
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/// </summary>
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public class ImageHandler : ViewHandler<IImage, SkiaImage>
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{
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internal class ImageSourceServiceResultManager
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{
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private readonly ImageHandler _handler;
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private CancellationTokenSource? _cts;
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public ImageSourceServiceResultManager(ImageHandler handler)
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{
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_handler = handler;
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}
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public async void UpdateImageSourceAsync()
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{
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_cts?.Cancel();
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_cts = new CancellationTokenSource();
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var token = _cts.Token;
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try
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{
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var source = _handler.VirtualView?.Source;
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if (source == null)
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{
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_handler.PlatformView?.LoadFromData(Array.Empty<byte>());
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return;
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}
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if (_handler.VirtualView is IImageSourcePart imagePart)
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{
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imagePart.UpdateIsLoading(true);
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}
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if (source is IFileImageSource fileSource)
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{
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var file = fileSource.File;
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if (!string.IsNullOrEmpty(file))
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{
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await _handler.PlatformView.LoadFromFileAsync(file);
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}
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return;
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}
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if (source is IUriImageSource uriSource)
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{
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var uri = uriSource.Uri;
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if (uri != null)
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{
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await _handler.PlatformView.LoadFromUriAsync(uri);
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}
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return;
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}
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if (source is IStreamImageSource streamSource)
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{
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var stream = await streamSource.GetStreamAsync(token);
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if (stream != null)
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{
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await _handler.PlatformView.LoadFromStreamAsync(stream);
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}
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return;
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}
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if (source is FontImageSource fontSource)
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{
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var bitmap = RenderFontImageSource(fontSource, _handler.PlatformView.WidthRequest, _handler.PlatformView.HeightRequest);
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if (bitmap != null)
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{
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_handler.PlatformView.LoadFromBitmap(bitmap);
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}
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}
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}
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catch (OperationCanceledException)
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{
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// Cancelled - ignore
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}
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catch (Exception)
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{
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if (_handler.VirtualView is IImageSourcePart imagePart)
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{
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imagePart.UpdateIsLoading(false);
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}
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}
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}
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private static SKBitmap? RenderFontImageSource(FontImageSource fontSource, double requestedWidth, double requestedHeight)
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{
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var glyph = fontSource.Glyph;
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if (string.IsNullOrEmpty(glyph))
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{
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return null;
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}
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int size = (int)Math.Max(
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requestedWidth > 0 ? requestedWidth : 24.0,
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requestedHeight > 0 ? requestedHeight : 24.0);
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size = Math.Max(size, 16);
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var color = fontSource.Color?.ToSKColor() ?? SKColors.Black;
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var bitmap = new SKBitmap(size, size, false);
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using var canvas = new SKCanvas(bitmap);
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canvas.Clear(SKColors.Transparent);
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SKTypeface? typeface = null;
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if (!string.IsNullOrEmpty(fontSource.FontFamily))
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{
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var fontPaths = new[]
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{
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"/usr/share/fonts/truetype/" + fontSource.FontFamily + ".ttf",
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"/usr/share/fonts/opentype/" + fontSource.FontFamily + ".otf",
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"/usr/local/share/fonts/" + fontSource.FontFamily + ".ttf",
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Path.Combine(AppContext.BaseDirectory, fontSource.FontFamily + ".ttf")
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};
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foreach (var path in fontPaths)
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{
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if (File.Exists(path))
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{
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typeface = SKTypeface.FromFile(path);
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if (typeface != null)
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break;
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}
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}
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if (typeface == null)
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{
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typeface = SKTypeface.FromFamilyName(fontSource.FontFamily);
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}
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}
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typeface ??= SKTypeface.Default;
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float fontSize = size * 0.8f;
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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 = color,
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IsAntialias = true,
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TextAlign = SKTextAlign.Center
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};
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var bounds = new SKRect();
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paint.MeasureText(glyph, ref bounds);
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float x = size / 2f;
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float y = (size - bounds.Top - bounds.Bottom) / 2f;
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canvas.DrawText(glyph, x, y, paint);
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return bitmap;
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}
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}
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public static IPropertyMapper<IImage, ImageHandler> Mapper = new PropertyMapper<IImage, ImageHandler>(ViewHandler.ViewMapper)
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{
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["Aspect"] = MapAspect,
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["IsOpaque"] = MapIsOpaque,
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["Source"] = MapSource,
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["Background"] = MapBackground,
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["Width"] = MapWidth,
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["Height"] = MapHeight
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};
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public static CommandMapper<IImage, ImageHandler> CommandMapper = new(ViewHandler.ViewCommandMapper);
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private ImageSourceServiceResultManager? _sourceLoader;
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private ImageSourceServiceResultManager SourceLoader => _sourceLoader ??= new ImageSourceServiceResultManager(this);
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public ImageHandler() : base(Mapper, CommandMapper)
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{
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}
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public ImageHandler(IPropertyMapper? mapper, CommandMapper? commandMapper = null)
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: base(mapper ?? Mapper, commandMapper ?? CommandMapper)
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{
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}
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protected override SkiaImage CreatePlatformView()
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{
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return new SkiaImage();
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}
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protected override void ConnectHandler(SkiaImage platformView)
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{
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base.ConnectHandler(platformView);
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platformView.ImageLoaded += OnImageLoaded;
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platformView.ImageLoadingError += OnImageLoadingError;
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}
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protected override void DisconnectHandler(SkiaImage platformView)
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{
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platformView.ImageLoaded -= OnImageLoaded;
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platformView.ImageLoadingError -= OnImageLoadingError;
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base.DisconnectHandler(platformView);
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}
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private void OnImageLoaded(object? sender, EventArgs e)
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{
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if (VirtualView is IImageSourcePart imagePart)
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{
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imagePart.UpdateIsLoading(false);
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}
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}
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private void OnImageLoadingError(object? sender, ImageLoadingErrorEventArgs e)
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{
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if (VirtualView is IImageSourcePart imagePart)
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{
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imagePart.UpdateIsLoading(false);
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}
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}
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public static void MapAspect(ImageHandler handler, IImage image)
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{
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if (handler.PlatformView != null)
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{
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handler.PlatformView.Aspect = image.Aspect;
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}
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}
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public static void MapIsOpaque(ImageHandler handler, IImage image)
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{
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if (handler.PlatformView != null)
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{
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handler.PlatformView.IsOpaque = image.IsOpaque;
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}
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}
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public static void MapSource(ImageHandler handler, IImage image)
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{
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if (handler.PlatformView == null)
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{
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return;
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}
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if (image is Image mauiImage)
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{
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if (mauiImage.WidthRequest > 0)
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{
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handler.PlatformView.WidthRequest = mauiImage.WidthRequest;
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}
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if (mauiImage.HeightRequest > 0)
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{
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handler.PlatformView.HeightRequest = mauiImage.HeightRequest;
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}
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}
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handler.SourceLoader.UpdateImageSourceAsync();
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}
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public static void MapBackground(ImageHandler handler, IImage image)
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{
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if (handler.PlatformView != null)
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{
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if (image.Background is SolidPaint solidPaint && solidPaint.Color != null)
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{
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handler.PlatformView.BackgroundColor = solidPaint.Color.ToSKColor();
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}
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}
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}
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public static void MapWidth(ImageHandler handler, IImage image)
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{
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if (handler.PlatformView != null)
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{
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if (image is Image mauiImage && mauiImage.WidthRequest > 0)
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{
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handler.PlatformView.WidthRequest = mauiImage.WidthRequest;
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Console.WriteLine($"[ImageHandler] MapWidth: {mauiImage.WidthRequest}");
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}
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else if (image.Width > 0)
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{
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handler.PlatformView.WidthRequest = image.Width;
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}
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}
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}
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public static void MapHeight(ImageHandler handler, IImage image)
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{
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if (handler.PlatformView != null)
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{
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if (image is Image mauiImage && mauiImage.HeightRequest > 0)
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{
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handler.PlatformView.HeightRequest = mauiImage.HeightRequest;
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Console.WriteLine($"[ImageHandler] MapHeight: {mauiImage.HeightRequest}");
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}
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else if (image.Height > 0)
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{
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handler.PlatformView.HeightRequest = image.Height;
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}
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}
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}
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}
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