CmdPal: Add file and list settings controls - #49623
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Adds reusable Adaptive Card-backed settings controls for Command Palette extensions. - Adds single file, folder, and file-path list settings. - Adds string and key-value list settings with validation and duplicate prevention. - Adds backward-compatible fallbacks for unsupported hosts. - Adds sample implementations and unit tests.
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Summary of the Pull Request
This PR adds reusable Command Palette extension settings controls for selecting files and folders and managing lists.
The new controls include:
FilePathSettingfor selecting a single file or folder.FilePathListSettingfor managing multiple file and/or folder paths.StringListSettingfor managing plain string values.KeyValueListSettingfor managing key-value pairs.Pictures? Picture!
PR Checklist
Detailed Description of the Pull Request / Additional comments
This PR extends
Microsoft.CommandPalette.Extensions.Toolkitwith file-path, file-path-list, string-list, and key-value-list settings.The Command Palette host registers custom Adaptive Card input elements during application startup. The controls use native file and folder pickers parented to the window containing the form, so they work correctly in both the Settings window and palette-hosted forms.
List controls render as constrained, scrollable lists with add and remove actions. They support developer-configurable validation, duplicate handling, picker modes, and error messages.
List values crossing the extension/host boundary use a structured codec that preserves unknown properties and remains compatible with the previously accepted bare-string representation. Persisted values can use the default newline representation or developer-provided conversion callbacks.
The SDK emits Adaptive Card
requiresand fallback information so extensions built with the new controls can provide actionable content when loaded by an older Command Palette host.A Sample Pages extension page demonstrates all new setting types and their validation options.
Validation Steps Performed