Advanced Swing Containers - The Definitive Guide to Java Swing - page 408

InputMap inputMap = viewport.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);
ActionMap actionMap = viewport.getActionMap();
// Up key moves view up unit
Action upKeyAction =
new MoveAction(viewport, DECREASE, Y_AXIS, UNIT);
KeyStroke upKey = KeyStroke.getKeyStroke("UP");
inputMap.put(upKey, "up");
actionMap.put("up", upKeyAction);
// Down key moves view down unit
Action downKeyAction =
new MoveAction(viewport, INCREASE, Y_AXIS, UNIT);
KeyStroke downKey = KeyStroke.getKeyStroke("DOWN");
inputMap.put(downKey, "down");
actionMap.put("down", downKeyAction);
// Left key moves view left unit
Action leftKeyAction =
new MoveAction(viewport, DECREASE, X_AXIS, UNIT);
KeyStroke leftKey = KeyStroke.getKeyStroke("LEFT");
inputMap.put(leftKey, "left");
actionMap.put("left", leftKeyAction);
// Right key moves view right unit
Action rightKeyAction =
new MoveAction(viewport, INCREASE, X_AXIS, UNIT);
KeyStroke rightKey = KeyStroke.getKeyStroke("RIGHT");
inputMap.put(rightKey, "right");
actionMap.put("right", rightKeyAction);
// PgUp key moves view up block
Action pgUpKeyAction =
new MoveAction(viewport, DECREASE, Y_AXIS, BLOCK);
KeyStroke pgUpKey = KeyStroke.getKeyStroke("PAGE_UP");
inputMap.put(pgUpKey, "pgUp");
actionMap.put("pgUp", pgUpKeyAction);
// PgDn key moves view down block
Action pgDnKeyAction =
new MoveAction(viewport, INCREASE, Y_AXIS, BLOCK);
KeyStroke pgDnKey = KeyStroke.getKeyStroke("PAGE_DOWN");
inputMap.put(pgDnKey, "pgDn");
actionMap.put("pgDn", pgDnKeyAction);