Qt widgets
Source: src/app/ui/qt/widgets
Custom widgets provide reusable controls and the video preview surface.
PreviewContainer composes the video display and interactive annotation
overlay; the overlay handles box drawing, hit testing, selection, and edit
gestures, while handlers route resulting actions into the application. These
widgets render and collect interaction rather than owning annotation data.
Packages
The containing Qt sections and handlers connect widgets to the rest of the UI. Related transient interaction data is described in UI view state.