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The following constants define bits in the Fl::event_state() value:
FL_SHIFT - One of the shift keys is down.
FL_CAPS_LOCK - The caps lock is on.
FL_CTRL - One of the ctrl keys is down.
FL_ALT - One of the alt keys is down.
FL_NUM_LOCK - The num lock is on.
FL_META - One of the meta/Windows keys is down.
FL_SCROLL_LOCK - The scroll lock is on.
FL_BUTTON1 - Mouse button 1 is pushed.
FL_BUTTON2 - Mouse button 2 is pushed.
FL_BUTTON3 - Mouse button 3 is pushed.