[MapLayers Widget] Map Layers widget breaks in 2d Viewport

[afraj-attar]

When switching from 3d viewport to 2d viewport using the changeView and trying to click on the settings button in the Map layers widget breaks the widget.

20241206-1207-48.2026521.mp4

Expected Behaviour:
The Map layers widget should be disabled in 2d Viewer.

Current Behaviour:
The Map layers widget is enabled in the 2d Viewer.

Proposed Solution:
Along with subscribing to the useActiveViewport hook. We should also subscribe to the onChangeView listener.

Version: 5.4.4
Version of iTwin.js: 4.8.0
Operating system: Windows
Browser: Chrome 131.0.6778.86

[aruniverse]

Shouldn't this be the responsibility of a the parent application who is providing/adding the map-layer-widget?

[jason-crow]

I think after investigating a bit that the best approach is to mimic what property grid did with their handling of hiding their widget when the selection set is empty (found here)

which is to say the handling of this shouldn't be in the widget, but it should be in the UiItemsProvider in a wrapper of the widget provided therein because it should be the standard handling within the AppUi system that all consumers of the widget using AppUi would want to reuse