selectionManager(_:frameOfTextContainerAt:)

Declaration

optional func selectionManager(_ selectionManager: NSTextSelectionManager, frameOfTextContainerAt point: NSPoint) -> NSRect

Parameters

• selectionManager:

  The selection manager requesting the frame.

• point:

  The point in the view’s coordinate system.

Return Value

The frame of the text container at the point, in the view’s coordinate system, or NSZeroRect if no container exists there.

Discussion

Implement this method whenever your text container is not positioned at the view’s origin (0, 0), or whenever your view hosts multiple text containers. The selection manager uses the returned frame to convert gesture points from view coordinates into container-local coordinates before forwarding them to NSTextSelectionDataSource. Without this method the selection manager assumes the container fills the view starting at the origin, which produces incorrect points for any other layout.

For multi-container layouts, also implement selectionManager:locationOfTextContainerAtPoint: so the selection manager can identify which container a gesture targets.