This pull request adds an Extensions page to the Settings UI, which lets
you enable/disable extensions and see how they affect your settings
(i.e. adding/modifying profiles and adding color schemes). This page is
specifically designed for fragment extensions and dynamic profile
generators, but can be expanded on in the future as we develop a more
advanced extensions model.
App extensions extract the name and icon from the extension package and
display it in the UI. Dynamic profile generators extract the name and
icon from the generator and display it in the UI. We prefer to use the
display name for breadcrumbs when possible.
A "NEW" badge was added to the Extensions page's `NavigationViewItem` to
highlight that it's new. It goes away once the user visits it.
## Detailed Description of the Pull Request / Additional comments
- Settings Model changes:
- `FragmentSettings` represents a parsed json fragment extension.
- `FragmentProfileEntry` and `FragmentColorSchemeEntry` are used to
track profiles and color schemes added/modified
- `ExtensionPackage` bundles the `FragmentSettings` together. This is
how we represent multiple JSON files in one extension.
- `IDynamicProfileGenerator` exposes a `DisplayName` and `Icon`
- `ExtensionPackage`s created from app extensions extract the
`DisplayName` and `Icon` from the extension
- `ApplicationState` is used to track which badges have been dismissed
and prevent them from appearing again
- a `std::unordered_set` is used to keep track of the dismissed badges,
but we only expose a get and append function via the IDL to interact
with it
- Editor changes - view models:
- `ExtensionsViewModel` operates as the main view model for the page.
- `FragmentProfileViewModel` and `FragmentColorSchemeViewModel` are used
to reference specific components of fragments. They also provide support
for navigating to the linked profile or color scheme via the settings
UI!
- `ExtensionPackageViewModel` is a VM for a group of extensions exposed
by a single source. This is mainly needed because a single source can
have multiple JSON fragments in it. This is used for the navigators on
the main page. Can be extended to provide additional information (i.e.
package logo, package name, etc.)
- `CurrentExtensionPackage` is used to track which extension package is
currently in view, if applicable (similar to how the new tab menu page
works)
- Editor changes - views:
- `Extensions.xaml` uses _a lot_ of data templates. These are reused in
`ItemsControl`s to display extension components.
- `ExtensionPackageTemplateSelector` is used to display
`ExtensionPackage`s with metadata vs simple ones that just have a source
(i.e. Git)
- Added a `NewInfoBadge` style that is just an InfoBadge with "New" in
it instead of a number or an icon. Based on
https://github.com/microsoft/PowerToys/pull/36939
- The visibility is bound to a `get` call to the `ApplicationState`
conducted via the `ExtensionsPageViewModel`. The VM is also responsible
for updating the state.
- Lazy loading extension objects
- Since most instances of Terminal won't actually open the settings UI,
it doesn't make sense to create all the extension objects upon startup.
Instead, we defer creating those objects until the user actually
navigates to the Extensions page. This is most of the work that happened
in `CascadiaSettingsSerialization.cpp`. The `SettingsLoader` can be used
specifically to load and create the extension objects.
## Validation Steps
✅ Keyboard navigation feels right
✅ Screen reader reads all info on screen properly
✅ Accessibility Insights FastPass found no issues
✅ "Discard changes" retains subpage, but removes any changes
✅ Extensions page nav item displays a badge if page hasn't been visited
✅ The badge is dismissed when the user visits the page
## Follow-ups
- Streamline a process for adding extensions from the new page
- Long-term, we can reuse the InfoBadge system and make the following
minor changes:
- `SettingContainer`: display the badge and add logic to read/write
`ApplicationState` appropriately (similarly to above)
- `XPageViewModel`:
- count all the badges that will be displayed and expose/bind that to
`InfoBadge.Value`
- If a whole page is new, we can just style the badge using the
`NewInfoBadge` style
