Implements the basic drawing logic. Reimplemented from QTableView. Any marked text is first deleted. Reimplemented from QWidget. This signal is emitted when the user presses the return or enter key.
Overwrite mode means that characters typed replace characters in the editor.
Scrolling and cursor movements are accepted in any case. This signal is emitted when the text is changed by an event or by a slot. Cursor blinking, drag scrolling. Reimplemented from QObject. An override - pass wheel events to the vertical scrollbar.