Event Types

In the previous section, we showed how to subclass a button and handle an action event. Buttons post action events when they are pressed and the event ID for an action event is ACTION_EVENT. So, in our handleEvent() routine, we checked for an event id of ACTION_EVENT to determine if the event passed to the handleEvent() routine was an action event:

if (event.id == Event.ACTION_EVENT)
    System.out.println("I got an action: " + event);

However, action events are only one type of event. There are many more. The following table outlines some of the more important

Event ID	Called When
ACTION_EVENT	An action occurs.
GOT_FOCUS	A component gained focus.
KEY_PRESS	A key is pressed.
KEY_RELEASE	A key is released.
LIST_DESELECT	An item is deselected.
LIST_SELECT	An item is selected.
LOST_FOCUS	A component loses focus.
MOUSE_DOWN	A mouse button is pressed.
MOUSE_DRAG	The mouse is moved while it is pressed.
MOUSE_ENTER	The mouse enters a component.
MOUSE_EXIT	The mouse exists a component.
MOUSE_MOVE	The mouse is moved.
MOUSE_UP	The mouse button is released.
SCROLL_ABSOLUTE	The thumb in a scrolling component is moved
SCROLL_LINE_DOWN	A line down in a scrolling component is activated.
SCROLL_LINE_UP	A line up in a scrolling component is activated.
SCROLL_PAGE_DOWN	A page down in a scrolling component is activated.
SCROLL_PAGE_UP	A page up in a scrolling component is activated.
WINDOW_DEICONIFY	A window is de-iconified.
WINDOW_DESTROY	A window is destroyed (closed).
WINDOW_EXPOSE	A window is exposed (displayed).
WINDOW_ICONIFY	A window is iconified.
WINDOW_MOVED	A window is moved.

JDK 1.0 Event Handling
Table of Contents
Other Methods for Handling Events