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
402
Services/HighContrastService.cs
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402
Services/HighContrastService.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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namespace Microsoft.Maui.Platform.Linux.Services;
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/// <summary>
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/// Provides high contrast mode detection and theme support for accessibility.
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/// </summary>
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public class HighContrastService
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{
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private bool _isHighContrastEnabled;
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private HighContrastTheme _currentTheme = HighContrastTheme.None;
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private bool _initialized;
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/// <summary>
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/// Gets whether high contrast mode is enabled.
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/// </summary>
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public bool IsHighContrastEnabled => _isHighContrastEnabled;
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/// <summary>
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/// Gets the current high contrast theme.
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/// </summary>
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public HighContrastTheme CurrentTheme => _currentTheme;
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/// <summary>
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/// Event raised when high contrast mode changes.
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/// </summary>
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public event EventHandler<HighContrastChangedEventArgs>? HighContrastChanged;
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/// <summary>
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/// Initializes the high contrast service.
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/// </summary>
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public void Initialize()
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{
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if (_initialized) return;
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_initialized = true;
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DetectHighContrast();
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}
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/// <summary>
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/// Detects current high contrast mode settings.
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/// </summary>
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public void DetectHighContrast()
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{
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bool isEnabled = false;
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var theme = HighContrastTheme.None;
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// Try GNOME settings
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if (TryGetGnomeHighContrast(out bool gnomeEnabled, out string? gnomeTheme))
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{
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isEnabled = gnomeEnabled;
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if (gnomeEnabled)
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{
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theme = ParseThemeName(gnomeTheme);
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}
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}
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// Try KDE settings
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else if (TryGetKdeHighContrast(out bool kdeEnabled, out string? kdeTheme))
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{
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isEnabled = kdeEnabled;
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if (kdeEnabled)
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{
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theme = ParseThemeName(kdeTheme);
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}
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}
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// Try GTK settings
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else if (TryGetGtkHighContrast(out bool gtkEnabled, out string? gtkTheme))
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{
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isEnabled = gtkEnabled;
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if (gtkEnabled)
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{
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theme = ParseThemeName(gtkTheme);
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}
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}
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// Check environment variables
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else if (TryGetEnvironmentHighContrast(out bool envEnabled))
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{
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isEnabled = envEnabled;
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theme = HighContrastTheme.WhiteOnBlack; // Default
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}
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UpdateHighContrast(isEnabled, theme);
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}
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private void UpdateHighContrast(bool isEnabled, HighContrastTheme theme)
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{
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if (_isHighContrastEnabled != isEnabled || _currentTheme != theme)
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{
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_isHighContrastEnabled = isEnabled;
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_currentTheme = theme;
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HighContrastChanged?.Invoke(this, new HighContrastChangedEventArgs(isEnabled, theme));
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}
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}
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private static bool TryGetGnomeHighContrast(out bool isEnabled, out string? themeName)
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{
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isEnabled = false;
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themeName = null;
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try
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{
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// Check if high contrast is enabled via gsettings
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var result = RunCommand("gsettings", "get org.gnome.desktop.a11y.interface high-contrast");
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if (!string.IsNullOrEmpty(result))
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{
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isEnabled = result.Trim().ToLower() == "true";
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}
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// Get the current GTK theme
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result = RunCommand("gsettings", "get org.gnome.desktop.interface gtk-theme");
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if (!string.IsNullOrEmpty(result))
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{
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themeName = result.Trim().Trim('\'');
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// Check if theme name indicates high contrast
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if (!isEnabled && themeName != null)
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{
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var lowerTheme = themeName.ToLower();
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isEnabled = lowerTheme.Contains("highcontrast") ||
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lowerTheme.Contains("high-contrast") ||
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lowerTheme.Contains("hc");
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}
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}
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return true;
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}
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catch
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{
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return false;
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}
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}
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private static bool TryGetKdeHighContrast(out bool isEnabled, out string? themeName)
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{
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isEnabled = false;
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themeName = null;
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try
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{
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// Check kdeglobals for color scheme
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var configPath = Path.Combine(
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Environment.GetFolderPath(Environment.SpecialFolder.UserProfile),
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".config", "kdeglobals");
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if (!File.Exists(configPath)) return false;
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var lines = File.ReadAllLines(configPath);
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foreach (var line in lines)
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{
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if (line.StartsWith("ColorScheme="))
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{
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themeName = line.Substring("ColorScheme=".Length);
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var lowerTheme = themeName.ToLower();
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isEnabled = lowerTheme.Contains("highcontrast") ||
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lowerTheme.Contains("high-contrast") ||
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lowerTheme.Contains("breeze-high-contrast");
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return true;
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}
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}
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return false;
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}
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catch
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{
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return false;
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}
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}
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private static bool TryGetGtkHighContrast(out bool isEnabled, out string? themeName)
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{
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isEnabled = false;
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themeName = null;
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try
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{
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// Check GTK settings.ini
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var gtkConfigPath = Path.Combine(
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Environment.GetFolderPath(Environment.SpecialFolder.UserProfile),
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".config", "gtk-3.0", "settings.ini");
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if (!File.Exists(gtkConfigPath))
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{
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gtkConfigPath = Path.Combine(
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Environment.GetFolderPath(Environment.SpecialFolder.UserProfile),
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".config", "gtk-4.0", "settings.ini");
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}
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if (!File.Exists(gtkConfigPath)) return false;
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var lines = File.ReadAllLines(gtkConfigPath);
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foreach (var line in lines)
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{
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if (line.StartsWith("gtk-theme-name="))
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{
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themeName = line.Substring("gtk-theme-name=".Length);
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var lowerTheme = themeName.ToLower();
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isEnabled = lowerTheme.Contains("highcontrast") ||
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lowerTheme.Contains("high-contrast");
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return true;
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}
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}
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return false;
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}
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catch
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{
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return false;
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}
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}
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private static bool TryGetEnvironmentHighContrast(out bool isEnabled)
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{
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isEnabled = false;
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// Check GTK_THEME environment variable
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var gtkTheme = Environment.GetEnvironmentVariable("GTK_THEME");
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if (!string.IsNullOrEmpty(gtkTheme))
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{
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var lower = gtkTheme.ToLower();
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isEnabled = lower.Contains("highcontrast") || lower.Contains("high-contrast");
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if (isEnabled) return true;
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}
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// Check accessibility-related env vars
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var forceA11y = Environment.GetEnvironmentVariable("GTK_A11Y");
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if (forceA11y?.ToLower() == "atspi" || forceA11y == "1")
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{
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// A11y is forced, but doesn't necessarily mean high contrast
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}
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return isEnabled;
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}
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private static HighContrastTheme ParseThemeName(string? themeName)
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{
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if (string.IsNullOrEmpty(themeName))
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return HighContrastTheme.WhiteOnBlack;
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var lower = themeName.ToLower();
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if (lower.Contains("inverse") || lower.Contains("dark") || lower.Contains("white-on-black"))
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return HighContrastTheme.WhiteOnBlack;
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if (lower.Contains("light") || lower.Contains("black-on-white"))
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return HighContrastTheme.BlackOnWhite;
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// Default to white on black (more common high contrast choice)
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return HighContrastTheme.WhiteOnBlack;
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}
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/// <summary>
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/// Gets the appropriate colors for the current high contrast theme.
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/// </summary>
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public HighContrastColors GetColors()
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{
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return _currentTheme switch
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{
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HighContrastTheme.WhiteOnBlack => new HighContrastColors
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{
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Background = SKColors.Black,
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Foreground = SKColors.White,
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Accent = new SKColor(0, 255, 255), // Cyan
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Border = SKColors.White,
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Error = new SKColor(255, 100, 100),
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Success = new SKColor(100, 255, 100),
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Warning = SKColors.Yellow,
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Link = new SKColor(100, 200, 255),
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LinkVisited = new SKColor(200, 150, 255),
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Selection = new SKColor(0, 120, 215),
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SelectionText = SKColors.White,
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DisabledText = new SKColor(160, 160, 160),
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DisabledBackground = new SKColor(40, 40, 40)
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},
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HighContrastTheme.BlackOnWhite => new HighContrastColors
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{
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Background = SKColors.White,
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Foreground = SKColors.Black,
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Accent = new SKColor(0, 0, 200), // Dark blue
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Border = SKColors.Black,
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Error = new SKColor(180, 0, 0),
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Success = new SKColor(0, 130, 0),
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Warning = new SKColor(180, 120, 0),
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Link = new SKColor(0, 0, 180),
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LinkVisited = new SKColor(80, 0, 120),
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Selection = new SKColor(0, 120, 215),
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SelectionText = SKColors.White,
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DisabledText = new SKColor(100, 100, 100),
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DisabledBackground = new SKColor(220, 220, 220)
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},
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_ => GetDefaultColors()
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};
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}
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private static HighContrastColors GetDefaultColors()
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{
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return new HighContrastColors
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{
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Background = SKColors.White,
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Foreground = new SKColor(33, 33, 33),
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Accent = new SKColor(33, 150, 243),
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Border = new SKColor(200, 200, 200),
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Error = new SKColor(244, 67, 54),
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Success = new SKColor(76, 175, 80),
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Warning = new SKColor(255, 152, 0),
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Link = new SKColor(33, 150, 243),
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LinkVisited = new SKColor(156, 39, 176),
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Selection = new SKColor(33, 150, 243),
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SelectionText = SKColors.White,
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DisabledText = new SKColor(158, 158, 158),
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DisabledBackground = new SKColor(238, 238, 238)
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};
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}
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/// <summary>
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/// Forces a specific high contrast mode (for testing or user preference override).
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/// </summary>
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public void ForceHighContrast(bool enabled, HighContrastTheme theme = HighContrastTheme.WhiteOnBlack)
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{
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UpdateHighContrast(enabled, theme);
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}
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private static string? RunCommand(string command, string arguments)
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{
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try
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{
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using var process = new System.Diagnostics.Process();
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process.StartInfo = new System.Diagnostics.ProcessStartInfo
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{
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FileName = command,
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Arguments = arguments,
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RedirectStandardOutput = true,
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RedirectStandardError = true,
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UseShellExecute = false,
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CreateNoWindow = true
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};
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process.Start();
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var output = process.StandardOutput.ReadToEnd();
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process.WaitForExit(1000);
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return output;
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}
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catch
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{
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return null;
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}
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}
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}
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/// <summary>
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/// High contrast theme types.
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/// </summary>
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public enum HighContrastTheme
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{
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None,
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WhiteOnBlack,
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BlackOnWhite
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}
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/// <summary>
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/// Color palette for high contrast mode.
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/// </summary>
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public class HighContrastColors
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{
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public SKColor Background { get; set; }
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public SKColor Foreground { get; set; }
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public SKColor Accent { get; set; }
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public SKColor Border { get; set; }
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public SKColor Error { get; set; }
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public SKColor Success { get; set; }
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public SKColor Warning { get; set; }
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public SKColor Link { get; set; }
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public SKColor LinkVisited { get; set; }
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public SKColor Selection { get; set; }
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public SKColor SelectionText { get; set; }
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public SKColor DisabledText { get; set; }
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public SKColor DisabledBackground { get; set; }
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}
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/// <summary>
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/// Event args for high contrast mode changes.
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/// </summary>
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public class HighContrastChangedEventArgs : EventArgs
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{
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/// <summary>
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/// Gets whether high contrast mode is enabled.
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/// </summary>
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public bool IsEnabled { get; }
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/// <summary>
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/// Gets the current theme.
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/// </summary>
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public HighContrastTheme Theme { get; }
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public HighContrastChangedEventArgs(bool isEnabled, HighContrastTheme theme)
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{
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IsEnabled = isEnabled;
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Theme = theme;
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}
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}
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