Class KeyboardListenerAdapter

public class KeyboardListenerAdapter
extends Object
implements KeyboardListener

An adapter to simplify keyboard event listeners that do not need all events defined on the KeyboardListener interface.

Methods

onKeyDown(Widget, char, int)	Fired when the user depresses a physical key.
onKeyPress(Widget, char, int)	Fired when a keyboard action generates a character.
onKeyUp(Widget, char, int)	Fired when the user releases a physical key.

public void onKeyDown(Widget sender, char keyCode, int modifiers)

Fired when the user depresses a physical key.

sender: the widget that was focused when the event occurred.
keyCode: the physical key that was depressed. Constants for this value are defined in this interface with the KEY prefix.
modifiers: the modifier keys pressed at when the event occurred. This value is a combination of the bits defined by KeyboardListener.MODIFIER_SHIFT, KeyboardListener.MODIFIER_CTRL, and KeyboardListener.MODIFIER_ALT.

public void onKeyPress(Widget sender, char keyCode, int modifiers)

Fired when a keyboard action generates a character. This occurs after onKeyDown and onKeyUp are fired for the physical key that was pressed.

It should be noted that many browsers do not generate keypress events for non-printing keyCode values, such as KeyboardListener.KEY_ENTER or arrow keys. These keyCodes can be reliably captured either with KeyboardListener.onKeyDown(Widget, char, int) or KeyboardListener.onKeyUp(Widget, char, int).

sender: the widget that was focused when the event occurred.
keyCode: the Unicode character that was generated by the keyboard action.
modifiers: the modifier keys pressed at when the event occurred. This value is a combination of the bits defined by KeyboardListener.MODIFIER_SHIFT, KeyboardListener.MODIFIER_CTRL, and KeyboardListener.MODIFIER_ALT.

public void onKeyUp(Widget sender, char keyCode, int modifiers)

Fired when the user releases a physical key.

sender: the widget that was focused when the event occurred.
keyCode: the physical key that was released. Constants for this value are defined in this interface with the KEY prefix.
modifiers: the modifier keys pressed at when the event occurred. This value is a combination of the bits defined by KeyboardListener.MODIFIER_SHIFT, KeyboardListener.MODIFIER_CTRL, and KeyboardListener.MODIFIER_ALT.