dispose method
void
dispose()
Disposes this object and release resources.
Implementation
void dispose() {
_selectionOverlay.dispose();
renderObject.selectionStartInViewport
.removeListener(_updateTextSelectionOverlayVisibilities);
renderObject.selectionEndInViewport
.removeListener(_updateTextSelectionOverlayVisibilities);
_effectiveToolbarVisibility.dispose();
_effectiveStartHandleVisibility.dispose();
_effectiveEndHandleVisibility.dispose();
}