PDAP Programming - Java 2 Micro Edition Application Development - page 88

Scrollbar AdjustmentEvent A Scrollbar provides a convenient option to
select a value from a given range. An
AdjustmentEvent is fired if the value of the
Scrollbar component is adjusted.
TextComponent TextEvent The TextComponent class is the superclass of
any component that allows text input. A
TextEvent is fired if text in a Component
derived from TextComponent is changed.
TextArea None The TextArea is a component capable of
displaying a multiline region of text. If the text
inside the TextArea changes, a TextEvent is
fired.
TextField ActionEvent The TextField is a component allowing the user
to edit a single line of text. If the text inside the
TextField changes, a TextEvent is fired. An
ActionEvent is fired if the text is confirmed by a
return keystroke.
Table 4 .2. Available AWT Event s and Corresponding Listeners
Event Name L istener Description and Interface Methods

ActionEvent ActionListener Invoked by a specific component to indicate that a

component-specific action occurred. Classes
implementing an ActionListener in order to
receive ActionEvents need to implement the
following method:

void actionPerformed(ActionEvent
e )

AdjustmentEvent AdjustmentListener

Invoked by components indicating that their value
has been adjusted. Classes implementing an
AdjustmentListener in order to receive
AdjustmentEvent s need to implement the
following method:

void adjustmentValueChanged
(AdjustmentEvent e)

ComponentEvent ComponentListener Invoked by componentes in order to indicate

that a component has moved, changed its
s ize or changed its visibility.

ContainerEvent ContainerListener Invoked in order to indicate that a component

h as beed added or removed.

FocusEvent FocusListener Invoked by components in order to indicate that

they have gained or lost the keyboard focus.
Classes implementing a FocusListener in
order to receive FocusEvents need to
implement the following methods:

void focusGained(FocusEvent e)
v oid focusLost(FocusEvent e)

ItemEvent ItemListener Invoked by ItemSelectable components in

order to indicate that an item is selected or
deselected. Classes implementing an
ItemListener in order to receive
I temEvent s need to implement the following