Decide whether Blockly should handle or ignore this event. Mouse and touch events require special checks because we only want to deal with one touch stream at a time. All other events should always be handled.
The event to check.
True if this event should be passed through to the registered handler; false if it should be blocked.
Decide whether Blockly should handle or ignore this event. Mouse and touch events require special checks because we only want to deal with one touch stream at a time. All other events should always be handled.