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Java and event handling

How events are passed to user interface components, how to create event handlers, and more

By Todd Sundsted, JavaWorld.com, 08/01/96

Page 3 of 3

Figure 5 contains an applet that handles mouse events solely through code placed in helper methods. The source code is available here.

About the author

Todd Sundsted has been programming since computers became available in desktop models. Though originally interested in building distributed object applications in C++, Todd moved to the Java programming language when Java became an obvious choice for that sort of thing. In addition to writing, Todd provides Internet and Web application consulting services to companies in the southeastern United States.

Read more about Core Java in JavaWorld's Core Java section.

Event	evt	The next event in a linked list of events.
Window events
Window events are generated in response to changes in the state of a window, frame, or dialog.
Event	ID
WINDOW_DESTROY	201
WINDOW_EXPOSE	202
WINDOW_ICONIFY	203
WINDOW_DEICONIFY	204
WINDOW_MOVED	205
Keyboard events
Keyboard events are generated in response to keys pressed and released while a component has input focus.
Event	ID
KEY_PRESS	401
KEY_RELEASE	402
KEY_ACTION	403
KEY_ACTION_RELEASE	404
Mouse events
Mouse events are generated in response to mouse actions occurring within the boundary of a component.
Event	ID
MOUSE_DOWN	501
MOUSE_UP	502
MOUSE_MOVE	503
MOUSE_ENTER	504
MOUSE_EXIT	505
MOUSE_DRAG	506
Scroll events
Scroll events are generated in response to manipulation of scrollbars.
Event	ID
SCROLL_LINE_UP	601
SCROLL_LINE_DOWN	602
SCROLL_PAGE_UP	603
SCROLL_PAGE_DOWN	604
SCROLL_ABSOLUTE	605
List events
List events are generated in response to selections made to a list.
Event	ID
LIST_SELECT	701
LIST_DESELECT	702
Miscellaneous events
Miscellaneous events are generated in response to a variety of actions.
Event	ID
ACTION_EVENT	1001
LOAD_FILE	1002
SAVE_FILE	1003
GOT_FOCUS	1004
LOST_FOCUS	1005