org.eclipse.swt.events
Class KeyEvent

java.lang.Object
  Event
      org.eclipse.swt.events.TypedEvent
          org.eclipse.swt.events.KeyEvent

Direct Known Subclasses:

TraverseEvent, VerifyEvent

public class KeyEvent

extends TypedEvent

Instances of this class are sent as a result of keys being pressed and released on the keyboard.

When a key listener is added to a control, the control will take part in widget traversal. By default, all traversal keys (such as the tab key and so on) are delivered to the control. In order for a control to take part in traversal, it should listen for traversal events. Otherwise, the user can traverse into a control but not out. Note that native controls such as table and tree implement key traversal in the operating system. It is not necessary to add traversal listeners for these controls, unless you want to override the default traversal.

IMPORTANT: All public static members of this class are not part of the RWT public API. They are marked public only so that they can be shared within the packages provided by RWT. They should never be accessed from application code.

Since:

1.2

See Also:

KeyListener, TraverseListener, Serialized Form

Field Summary

char	character the character represented by the key that was typed.
boolean	doit A flag indicating whether the operation should be allowed.
static int	KEY_PRESSED
static int	KEY_RELEASED
int	keyCode the key code of the key that was typed, as defined by the key code constants in class SWT.
int	stateMask the state of the keyboard modifier keys at the time the event was generated, as defined by the key code constants in class SWT.

Fields inherited from class org.eclipse.swt.events.TypedEvent

data, display, widget

Constructor Summary

KeyEvent(Control source, int id)

KeyEvent(Event event)
Constructs a new instance of this class based on the information in the given untyped event.

Method Summary

static void	addListener(Adaptable adaptable, KeyListener listener)
protected boolean	allowProcessing()
protected void	dispatchToObserver(Object listener)
protected Class	getListenerType()
static boolean	hasListener(Adaptable adaptable)
static void	removeListener(Adaptable adaptable, KeyListener listener)
String	toString() Returns a string containing a concise, human-readable description of the receiver.

Methods inherited from class org.eclipse.swt.events.TypedEvent

executeNext, getSource, processEvent, processScheduledEvents

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

KEY_PRESSED

public static final int KEY_PRESSED

See Also:

Constant Field Values

KEY_RELEASED

public static final int KEY_RELEASED

See Also:

Constant Field Values

character

public char character

the character represented by the key that was typed. This is the final character that results after all modifiers have been applied. For example, when the user types Ctrl+A, the character value is 0x01. It is important that applications do not attempt to modify the character value based on a stateMask (such as SWT.CTRL) or the resulting character will not be correct.

keyCode

public int keyCode

the key code of the key that was typed, as defined by the key code constants in class SWT. When the character field of the event is ambiguous, this field contains the unicode value of the original character. For example, typing Ctrl+M or Return both result in the character '\r' but the keyCode field will also contain '\r' when Return was typed.

See Also:

SWT

stateMask

public int stateMask

the state of the keyboard modifier keys at the time the event was generated, as defined by the key code constants in class SWT.

See Also:

SWT

doit

public boolean doit

A flag indicating whether the operation should be allowed. Setting this field to false will cancel the operation.

Constructor Detail

KeyEvent

public KeyEvent(Event event)

Constructs a new instance of this class based on the information in the given untyped event.

Parameters:

event - the untyped event containing the information

KeyEvent

public KeyEvent(Control source,
                int id)

Method Detail

dispatchToObserver

protected void dispatchToObserver(Object listener)

Overrides:

dispatchToObserver in class TypedEvent

getListenerType

protected Class getListenerType()

Overrides:

getListenerType in class TypedEvent

allowProcessing

protected boolean allowProcessing()

Overrides:

allowProcessing in class TypedEvent

toString

public String toString()

Returns a string containing a concise, human-readable description of the receiver.

Overrides:

toString in class TypedEvent

Returns:

a string representation of the event

addListener

public static void addListener(Adaptable adaptable,
                               KeyListener listener)

removeListener

public static void removeListener(Adaptable adaptable,
                                  KeyListener listener)

hasListener

public static boolean hasListener(Adaptable adaptable)