ClearSelection procedure

Denna API-post behåller identifierare, signaturer, kodblock och PDF-termer i ursprunglig form.

Clears the current text selection and invalidates the view.

Drops any active selection, resets the anchor / cursor endpoints, and invalidates the viewer so the next paint draws a clean page. Fires OnSelectionChange exactly once when the previous selection was non-empty; idempotent when there is nothing to clear (no event, no invalidation).

Called automatically by the viewer on every state change that would invalidate the selection: SetPdf, SetPageNumber, SetActive(False), and DisplayMode transitions.

• Available since v1.36.0.
• Code-level API — always works regardless of AllowUserTextSelection.

HasSelection, SelectAll, OnSelectionChange