Avalonia Port: MVVM Refactor, macOS Fixes, and UI Improvements

[Gabriel Dufresne (GabrielDuf)]

Full MVVM refactor of the Avalonia port: all user actions are now driven by [RelayCommand] bindings in AXAML, code-behind files are reduced to minimal UI wiring, and several macOS-specific crashes and visual issues have been fixed.

MVVM / Architecture

• All Click= handlers on buttons, menu items, and navigation controls replaced with Command="{Binding ...Command}" compiled bindings
• Settings pages: SettingName, Text, and StateChanged assignments moved from code-behind to AXAML attributes; ViewModels now own the [RelayCommand] and [ObservableProperty] definitions
• AbstractPackagesPage: sort commands on PackagesPageViewModel; Share / Help / Manage-Ignored-Updates moved to ViewModel events with view-side handlers for clipboard and dialogs
• OperationOutputWindow: rewritten as proper .axaml + .axaml.cs + OperationOutputViewModel, replacing the code-only Window

UI / Style

• Sidebar collapse/expand implemented
• Per-platform stylesheets (Styles.macOS.axaml, Styles.Windows.axaml, Styles.Linux.axaml) extracted from App.axaml
• t:Translate} markup extension added for inline translated strings in AXAML

Bug fixes

• Fixed untranslated strings across settings and dialog pages
• Fixed AbstractPackagesPage bugs
• Fixed SvgIcon foreground visibility in dark theme
• Fixed namespace collisions in settings-suffixed namespaces

[Copilot]

Pull request overview

Ports additional UI interactions to MVVM for the Avalonia front-end by replacing code-behind click handlers with RelayCommand bindings, moving toolbar construction and several dialogs/navigation requests into ViewModels, and extracting platform/common styles into separate AXAML resource files (plus adding a {t:Translate} markup extension for inline translations).

Changes:

• Replaced many Click=/code-behind handlers with Command bindings and ViewModel-driven requests (navigation, help, share, manage-ignored).
• Refactored settings pages to declarative AXAML (setting keys/labels/commands) with supporting Settings* control enhancements (command properties).
• Introduced per-platform/common style resources and a translation markup extension; updated several dialogs/windows to AXAML + ViewModel.

Reviewed changes

Copilot reviewed 78 out of 78 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/UniGetUI.Avalonia/Views/SoftwarePages/SoftwareUpdatesPage.cs	Toolbar actions moved toward ViewModel request commands (share/help/manage ignored).
src/UniGetUI.Avalonia/Views/SoftwarePages/PackageBundlesPage.cs	Toolbar actions moved toward ViewModel request commands (share/help).
src/UniGetUI.Avalonia/Views/SoftwarePages/InstalledPackagesPage.cs	Toolbar actions moved toward ViewModel request commands (share/help/manage ignored).
src/UniGetUI.Avalonia/Views/SoftwarePages/DiscoverSoftwarePage.cs	Toolbar actions moved toward ViewModel request commands (share/help).
src/UniGetUI.Avalonia/Views/SoftwarePages/AbstractPackagesPage.axaml.cs	Wires ViewModel events for dialogs/navigation; removes sort/search UI handlers; updates sort menu check syncing.
src/UniGetUI.Avalonia/Views/SoftwarePages/AbstractPackagesPage.axaml	Converts sort/search to commands & translated strings; adds list header select-all; toolbar styling tweaks.
src/UniGetUI.Avalonia/Views/SidebarView.axaml.cs	Removes legacy click handlers; routes selection to ViewModel navigation request API.
src/UniGetUI.Avalonia/Views/SidebarView.axaml	Sidebar UI refresh (collapse support, tooltips, badges) and command-based navigation.
src/UniGetUI.Avalonia/Views/Pages/SettingsPages/Updates.axaml.cs	Moves interval items/navigation/restart signaling to ViewModel.
src/UniGetUI.Avalonia/Views/Pages/SettingsPages/Updates.axaml	Declarative settings wiring via SettingName/Text/commands + {t:Translate}.
src/UniGetUI.Avalonia/Views/Pages/SettingsPages/SettingsHomepage.axaml.cs	Replaces button click wiring with ViewModel navigation event; minor text tweak.
src/UniGetUI.Avalonia/Views/Pages/SettingsPages/SettingsHomepage.axaml	Switches settings homepage buttons to command bindings + translated strings.
src/UniGetUI.Avalonia/Views/Pages/SettingsPages/SettingsBasePage.axaml.cs	Removes direct button wiring; listens to VM back request.
src/UniGetUI.Avalonia/Views/Pages/SettingsPages/SettingsBasePage.axaml	Back/restart buttons now bind to VM commands; back icon updated.
src/UniGetUI.Avalonia/Views/Pages/SettingsPages/Operations.axaml.cs	Moves restart/navigation and max-ops logic into ViewModel.
src/UniGetUI.Avalonia/Views/Pages/SettingsPages/Operations.axaml	Declarative setting bindings + commands for restart/navigation/max-ops update.
src/UniGetUI.Avalonia/Views/Pages/SettingsPages/Notifications.axaml.cs	Removes imperative settings wiring in code-behind.
src/UniGetUI.Avalonia/Views/Pages/SettingsPages/Notifications.axaml	Declarative setting bindings + commands and translated strings.
src/UniGetUI.Avalonia/Views/Pages/SettingsPages/Internet.axaml.cs	Moves credentials/proxy table building into ViewModel; wires restart event.
src/UniGetUI.Avalonia/Views/Pages/SettingsPages/Internet.axaml	Declarative proxy settings bindings + commands and translated strings.
src/UniGetUI.Avalonia/Views/Pages/SettingsPages/Interface_P.axaml.cs	Reduces code-behind; translation usage tweaks; restart signal wiring.
src/UniGetUI.Avalonia/Views/Pages/SettingsPages/Interface_P.axaml	Declarative settings bindings/commands + translated strings; icon-cache header binding.
src/UniGetUI.Avalonia/Views/Pages/SettingsPages/General.axaml.cs	Moves restart/navigation signaling into ViewModel; keeps language list in code.
src/UniGetUI.Avalonia/Views/Pages/SettingsPages/General.axaml	Declarative settings wiring + translated strings and command binding.
src/UniGetUI.Avalonia/Views/Pages/SettingsPages/Experimental.axaml.cs	Moves restart signaling into ViewModel; sets one label in code-behind.
src/UniGetUI.Avalonia/Views/Pages/SettingsPages/Experimental.axaml	Declarative experimental settings wiring + translated strings + restart commands.
src/UniGetUI.Avalonia/Views/Pages/SettingsPages/Backup.axaml.cs	Moves restart signaling/state init into ViewModel.
src/UniGetUI.Avalonia/Views/Pages/SettingsPages/Backup.axaml	Declarative backup settings wiring + commands and translated strings.
src/UniGetUI.Avalonia/Views/Pages/SettingsPages/Administrator.axaml.cs	Moves restart signaling into ViewModel; removes imperative wiring.
src/UniGetUI.Avalonia/Views/Pages/SettingsPages/Administrator.axaml	Administrator settings converted to declarative bindings/commands; warning banner bound to VM strings.
src/UniGetUI.Avalonia/Views/MainWindow.axaml.cs	Removes click handlers in favor of command bindings.
src/UniGetUI.Avalonia/Views/MainWindow.axaml	Adds sidebar toggle button; binds sidebar width; binds search submit command.
src/UniGetUI.Avalonia/Views/DialogPages/TelemetryDialog.axaml.cs	Removes string initialization moved to AXAML.
src/UniGetUI.Avalonia/Views/DialogPages/TelemetryDialog.axaml	Telemetry dialog strings moved to AXAML with {t:Translate}.
src/UniGetUI.Avalonia/Views/DialogPages/PackageDetailsWindow.axaml.cs	Removes direct Close button handler; uses VM close request.
src/UniGetUI.Avalonia/Views/DialogPages/PackageDetailsWindow.axaml	Close button now binds to VM command.
src/UniGetUI.Avalonia/Views/DialogPages/OperationOutputWindow.cs	Removes code-only operation output window.
src/UniGetUI.Avalonia/Views/DialogPages/OperationOutputWindow.axaml.cs	New AXAML-backed operation output window with VM.
src/UniGetUI.Avalonia/Views/DialogPages/OperationOutputWindow.axaml	Defines operation output window UI and bindings.
src/UniGetUI.Avalonia/Views/DialogPages/ManageIgnoredUpdatesWindow.axaml.cs	Adds flyout reset click handlers; hooks reset command execution.
src/UniGetUI.Avalonia/Views/DialogPages/ManageIgnoredUpdatesWindow.axaml	UI refinements + translated tooltip; flyout theme styling.
src/UniGetUI.Avalonia/Views/Controls/Settings/TranslatedTextBlock.cs	Clarifies preferred translation approach (markup extension).
src/UniGetUI.Avalonia/Views/Controls/Settings/TextboxCard.cs	Adds ValueChangedCommand; stops auto-translating setters.
src/UniGetUI.Avalonia/Views/Controls/Settings/SettingsPageButton.cs	Stops auto-translating setters (expects translated input).
src/UniGetUI.Avalonia/Views/Controls/Settings/SettingsCard.cs	Adds Header/Description/Command styled properties and command execution on click.
src/UniGetUI.Avalonia/Views/Controls/Settings/SecureCheckboxCard.cs	Adds StateChangedCommand; improves warning layout/formatting; stops auto-translate in setters.
src/UniGetUI.Avalonia/Views/Controls/Settings/ComboboxCard.cs	Adds ValueChangedCommand; stops auto-translating header.
src/UniGetUI.Avalonia/Views/Controls/Settings/CheckboxCard.cs	Adds StateChangedCommand; stops auto-translating setters.
src/UniGetUI.Avalonia/Views/Controls/Settings/CheckboxButtonCard.cs	Stops auto-translating setters (expects translated input).
src/UniGetUI.Avalonia/Views/Controls/Settings/ButtonCard.cs	Relies on base SettingsCard command properties; stops auto-translating setters.
src/UniGetUI.Avalonia/ViewModels/SoftwarePages/PackagesPageViewModel.cs	Adds view-mode enum, toolbar builder APIs, sort/search commands, and dialog/navigation request events.
src/UniGetUI.Avalonia/ViewModels/SidebarViewModel.cs	Adds collapsible pane state, compact badges, navigation command API, and version label binding.
src/UniGetUI.Avalonia/ViewModels/Pages/SettingsPages/UpdatesViewModel.cs	Adds restart/navigation events, interval list, and related commands.
src/UniGetUI.Avalonia/ViewModels/Pages/SettingsPages/SettingsHomepageViewModel.cs	Adds navigation commands for each settings section.
src/UniGetUI.Avalonia/ViewModels/Pages/SettingsPages/SettingsBasePageViewModel.cs	Adds Back/Restart commands and restart implementation.
src/UniGetUI.Avalonia/ViewModels/Pages/SettingsPages/OperationsViewModel.cs	Adds max-ops update logic and navigation/restart commands.
src/UniGetUI.Avalonia/ViewModels/Pages/SettingsPages/NotificationsViewModel.cs	Initializes state from settings and adds command to refresh enabled state.
src/UniGetUI.Avalonia/ViewModels/Pages/SettingsPages/InternetViewModel.cs	Moves proxy UI construction and restart signaling into ViewModel; adds related commands.
src/UniGetUI.Avalonia/ViewModels/Pages/SettingsPages/Interface_PViewModel.cs	Adds ShowRestartRequiredCommand.
src/UniGetUI.Avalonia/ViewModels/Pages/SettingsPages/GeneralViewModel.cs	Adds navigation command; exposes restart command.
src/UniGetUI.Avalonia/ViewModels/Pages/SettingsPages/ExperimentalViewModel.cs	Adds restart event and command.
src/UniGetUI.Avalonia/ViewModels/Pages/SettingsPages/BackupViewModel.cs	Initializes local-backup state; adds command to refresh and request restart.
src/UniGetUI.Avalonia/ViewModels/Pages/SettingsPages/AdministratorViewModel.cs	Adds restart signaling, warning text bindings, and state-refresh commands.
src/UniGetUI.Avalonia/ViewModels/MainWindowViewModel.cs	Adds sidebar toggle, banner close commands, and search submit command.
src/UniGetUI.Avalonia/ViewModels/DialogPages/PackageDetailsViewModel.cs	Adjusts several label strings; adds close relay command.
src/UniGetUI.Avalonia/ViewModels/DialogPages/OperationViewModel.cs	Switches to Toolkit observable properties via base ViewModel.
src/UniGetUI.Avalonia/ViewModels/DialogPages/OperationOutputViewModel.cs	New VM for operation output window (title + output text).
src/UniGetUI.Avalonia/ViewModels/DialogPages/ManageIgnoredUpdatesViewModel.cs	Text/label updates for ignored-updates management dialog.
src/UniGetUI.Avalonia/UniGetUI.Avalonia.csproj	Treats style-only AXAML as resources; adds dependent file mapping for new window.
src/UniGetUI.Avalonia/Models/PackageCollections.cs	Migrates observable package collection to AvaloniaList; adjusts displayed version string.
src/UniGetUI.Avalonia/MarkupExtensions/TranslateExtension.cs	Adds {t:Translate} markup extension for inline translated strings.
src/UniGetUI.Avalonia/Infrastructure/AvaloniaOperationRegistry.cs	Uses AvaloniaList for operation view models.
src/UniGetUI.Avalonia/Assets/Styles/Styles.macOS.axaml	New macOS-specific theme resources.
src/UniGetUI.Avalonia/Assets/Styles/Styles.Windows.axaml	New Windows-specific theme resources.
src/UniGetUI.Avalonia/Assets/Styles/Styles.Linux.axaml	New Linux-specific theme resources.
src/UniGetUI.Avalonia/Assets/Styles/Styles.Common.axaml	New shared styling (SettingsCard, warning banner, SvgIcon foreground, DataGrid theme include).
src/UniGetUI.Avalonia/App.axaml.cs	Loads platform stylesheet dynamically at startup.
src/UniGetUI.Avalonia/App.axaml	Removes inline resources/styles; includes shared styles file.

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