development-plugin-for-avalonia

Umbrella skill for building, reviewing, designing, porting, and migrating Avalonia applications with modern XAML/C# patterns on Avalonia 11.3.12. Use when the request is broad Avalonia work or when another specialist skill has not yet been selected; route quickly to focused skills for startup, bindings, styling, controls, layout, rendering, testing, design systems, or HTML/WinForms/WPF/WinUI/Avalonia 12 migration work.

Repo-local umbrella skill for building, reviewing, designing, porting, and migrating Avalonia applications with modern XAML/C# patterns on Avalonia 11.3.12. Use when working inside this repository and the request is broad Avalonia work; route quickly to the focused plugin skills for startup, bindings, styling, controls, layout, rendering, testing, design systems, or HTML/WinForms/WPF/WinUI/Avalonia 12 migration work.

Plan and execute migration from Avalonia 11.3.12 to Avalonia 12 using the repository's dedicated migration lane. Use for breaking-change review, source-backed API delta lookup, migration sequencing, and upgrades that should stay grounded in the current published Avalonia 12 documentation and generated artifacts.

Design or review Avalonia validation, data-error presentation, accessibility semantics, automation properties, focus order, and testable UI metadata. Use for validation pipelines, screen-reader support, keyboard-only UX, automation-tree issues, or accessibility hardening.

Implement or troubleshoot Avalonia compiled bindings, runtime XAML loading, converters, markup extensions, binding notifications, dynamic resources, and AOT-safe XAML patterns. Use for `x:DataType`, `CompiledBinding`, converter wiring, `AvaloniaRuntimeXamlLoader`, resource lookup issues, or runtime markup refactors.

Design or troubleshoot Avalonia startup wiring, `AppBuilder` configuration, application lifetimes, platform bootstrap, XAML compiler setup, and AOT-friendly build configuration. Use for desktop or single-view startup, `App.axaml` / `App.xaml.cs` composition, platform entrypoints, trimming or NativeAOT readiness, or startup refactors.

Build or troubleshoot Avalonia controls, control themes, windows, popups, menus, tray integration, native menus, top-level services, and notification surfaces. Use for templated control authoring, popup behavior, custom chrome, dialog flows, menu systems, or per-control API guidance.

Design polished Avalonia design systems with reusable tokens, typography, spacing, shell composition, dense workflow UX, motion, and governance rules. Use for professional UI direction, design-token architecture, responsive layout systems, information architecture, or high-quality desktop workflow design.

Build or refine Avalonia UIs that follow Microsoft Fluent guidance with `FluentTheme`, palette customization, density tuning, Fluent shells, iconography, motion, and language-system patterns. Use for FluentTheme adoption, brand mapping onto Fluent tokens, Fluent shell design, or Fluent-specific accessibility and motion work.

Implement or debug Avalonia routed input, focus management, keyboard navigation, commands, gestures, drag/drop workflows, text editing behavior, and interaction routing. Use for `ICommand`, `KeyBinding`, routed events, focus bugs, drag/drop, scroll interaction, or text input edge cases.

Design or optimize Avalonia panels, measure and arrange behavior, custom layout controls, item virtualization, recycling, and large-data presentation. Use for `MeasureOverride` or `ArrangeOverride` work, invalidation bugs, virtualized item surfaces, or custom panel authoring.

Integrate or troubleshoot Avalonia platform services such as storage provider, clipboard, launcher, drag/drop, screens, and top-level runtime helpers. Use for file pickers, external-open flows, clipboard or data-transfer bugs, multi-screen behavior, or platform service abstractions.

Implement or review Avalonia animations, compositor usage, custom drawing, Skia rendering, geometry, hit testing, and advanced rendering interop. Use for transitions, frame-loop work, `Render` overrides, custom visuals, drawing optimizations, or OpenGL or Vulkan hosting boundaries.

Build or troubleshoot Avalonia styles, themes, resources, property-system usage, theme variants, resource packaging, and custom theme architecture. Use for selector fixes, attached properties, resource lookup problems, theme switching, library resource packaging, or code-only theme work.

Validate Avalonia applications with headless tests, render or UI tests, diagnostics tooling, troubleshooting workflows, and performance reviews. Use for test strategy, DevTools or profiler usage, performance regressions, rendering investigations, or production hardening passes.

Design or review Avalonia reactive flows, dispatcher usage, timers, async UI coordination, and thread-affinity boundaries. Use for `Dispatcher.UIThread`, background work handoff, timer selection, reactive pipeline fixes, or UI-thread correctness bugs.

Build or refactor Avalonia view composition, view-location strategies, templates, templated content, and tree-inspection patterns. Use for view locator work, `DataTemplate` or `IDataTemplate` selection, templated parent issues, logical or visual tree traversal, or content-template architecture.

Port HTML or CSS mental models, layouts, controls, theming, and modern web UI patterns to Avalonia. Use for website-to-desktop translation, CSS-to-Avalonia styling work, responsive layout conversion, custom-element or Shadow DOM mapping, or web-style design-system migration into Avalonia.

Port WinForms applications and patterns to Avalonia, including layout, control migration, owner-draw replacement, application lifetime, resources, and workflow shells. Use for `Control` or `Form` migration, `DataGridView` and `ListView` replacement, `OnPaint` ports, dialog or tray flows, or WinForms-to-Avalonia modernization work.

Port WinUI or Windows App SDK applications to Avalonia, including shell design, dependency-property patterns, theme resources, composition, commands, dialogs, and platform integration. Use for `NavigationView`, `ContentDialog`, `ThemeResource`, `VisualStateManager`, `ItemsRepeater`, `AppWindow`, or broader WinUI-to-Avalonia migration work.

Port WPF applications and patterns to Avalonia, including dependency-property mapping, bindings, resources, templates, layout, rendering, and shell behavior. Use for `DependencyProperty`, routed-command, trigger, `Frame` or `Page`, `OnRender`, `HwndHost`, or other WPF-to-Avalonia migration work.