Import Export Handler

app.ui.handlers.import_export_handler

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Import / Export handler for detection and tracking layer data.

`ImportExportHandler`

Bases: QObject

Handles import and export operations for detection layers (A/B) and tracking layers (C/D).

Responsibilities

Open ImportExportDialog scoped to the appropriate layers when either "Import / Export" button is clicked.
Dispatch the user's choice to Application.import_layer or Application.export_layer.
Trigger a frame re-render after a successful import so the UI reflects the newly loaded data immediately.
Show a success / error status message via the window's status bar.

Note

Signal flow:

right_panel.imp_exp_detections_button.clicked
  └──> on_import_export_detections()
        └──> _run_import_export(scope=[A, B], title="Detection")

right_panel.imp_exp_tracks_button.clicked
  └──> on_import_export_tracks()
        └──> _run_import_export(scope=[C, D], title="Tracking")

After a successful import the handler calls controller.render_frame_for_session_id() so the video preview updates without the user having to scrub the timeline.

After a successful export only a status-bar message is shown — no re-render is needed because the session data was not modified.

Consider future improvement: run the actual file I/O in a background QThread (similar to how DetectionWorker / TrackingWorker operate) so that very large files do not freeze the UI during deserialisation.

PARAMETER	DESCRIPTION
`controller`	Controller supplying import/export actions, the active window, and post-import rendering. TYPE: `UIController`

`init(controller: UIController) -> None`

`on_import_export_detections() -> None`

Open the Import / Export dialog scoped to detection layers A and B.

Triggered By: Right panel imp_exp_detections_button.clicked

`on_import_export_tracks() -> None`

Open the Import / Export dialog scoped to tracking layers C and D.

Triggered By: Right panel imp_exp_tracks_button.clicked

Import Export Handler