This method is called when the content is about to be changed.
Callers also need to call the textChanged method after the
content change has been applied. The widget only updates the
screen properly when it receives both events.
@param event the text changing event. All event fields need
to be set by the sender.
@see TextChangingEvent
This method is called when the content is about to be changed. Callers also need to call the textChanged method after the content change has been applied. The widget only updates the screen properly when it receives both events.
@param event the text changing event. All event fields need to be set by the sender. @see TextChangingEvent