java.awt.event
Class KeyEvent

java.lang.Object
  java.util.EventObject
      java.awt.AWTEvent
          java.awt.event.ComponentEvent
              java.awt.event.InputEvent
                  java.awt.event.KeyEvent

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

MenuKeyEvent

public class KeyEvent

extends InputEvent

An event which indicates that a keystroke occurred in a component.

This low-level event is generated by a component object (such as a text field) when a key is pressed, released, or typed. The event is passed to every KeyListener or KeyAdapter object which registered to receive such events using the component's addKeyListener method. (KeyAdapter objects implement the KeyListener interface.) Each such listener object gets this KeyEvent when the event occurs.

"Key typed" events are higher-level and generally do not depend on the platform or keyboard layout. They are generated when a Unicode character is entered, and are the preferred way to find out about character input. In the simplest case, a key typed event is produced by a single key press (e.g., 'a'). Often, however, characters are produced by series of key presses (e.g., 'shift' + 'a'), and the mapping from key pressed events to key typed events may be many-to-one or many-to-many. Key releases are not usually necessary to generate a key typed event, but there are some cases where the key typed event is not generated until a key is released (e.g., entering ASCII sequences via the Alt-Numpad method in Windows). No key typed events are generated for keys that don't generate Unicode characters (e.g., action keys, modifier keys, etc.). The getKeyChar method always returns a valid Unicode character or CHAR_UNDEFINED. For key pressed and key released events, the getKeyCode method returns the event's keyCode. For key typed events, the getKeyCode method always returns VK_UNDEFINED.

"Key pressed" and "key released" events are lower-level and depend on the platform and keyboard layout. They are generated whenever a key is pressed or released, and are the only way to find out about keys that don't generate character input (e.g., action keys, modifier keys, etc.). The key being pressed or released is indicated by the getKeyCode method, which returns a virtual key code.

Virtual key codes are used to report which keyboard key has been pressed, rather than a character generated by the combination of one or more keystrokes (such as "A", which comes from shift and "a").

For example, pressing the Shift key will cause a KEY_PRESSED event with a VK_SHIFT keyCode, while pressing the 'a' key will result in a VK_A keyCode. After the 'a' key is released, a KEY_RELEASED event will be fired with VK_A. Separately, a KEY_TYPED event with a keyChar value of 'A' is generated.

Notes:

• Key combinations which do not result in Unicode characters, such as action keys like F1 and the HELP key, do not generate KEY_TYPED events.
• Not all keyboards or systems are capable of generating all virtual key codes. No attempt is made in Java to generate these keys artificially.
• Virtual key codes do not identify a physical key: they depend on the platform and keyboard layout. For example, the key that generates VK_Q when using a U.S. keyboard layout will generate VK_A when using a French keyboard layout.
• Not all characters have a keycode associated with them. For example, there is no keycode for the question mark because there is no keyboard for which it appears on the primary layer.
• In order to support the platform-independent handling of action keys, the Java platform uses a few additional virtual key constants for functions that would otherwise have to be recognized by interpreting virtual key codes and modifiers. For example, for Japanese Windows keyboards, VK_ALL_CANDIDATES is returned instead of VK_CONVERT with the ALT modifier.

WARNING: Aside from those keys that are defined by the Java language (VK_ENTER, VK_BACK_SPACE, and VK_TAB), do not rely on the values of the VK_ constants. Sun reserves the right to change these values as needed to accomodate a wider range of keyboards in the future.

Since:

1.1

Author:

Carl Quinn, Amy Fowler, Norbert Lindenberg

See Also:

KeyAdapter, KeyListener, Tutorial: Writing a Key Listener, Reference: The Java Class Libraries (update file), Serialized Form

Field Summary

static char	CHAR_UNDEFINED KEY_PRESSED and KEY_RELEASED events which do not map to a valid Unicode character use this for the keyChar value.
private boolean	isProxyActive Stores the state of native event dispatching system - true, if when the event was created event proxying mechanism was active - false, if it was inactive Used in Component.dispatchEventImpl to correctly dispatch events when proxy is active
static int	KEY_FIRST The first number in the range of ids used for key events.
static int	KEY_LAST The last number in the range of ids used for key events.
static int	KEY_LOCATION_LEFT A constant indicating that the key pressed or released is in the left key location (there is more than one possible location for this key).
static int	KEY_LOCATION_NUMPAD A constant indicating that the key event originated on the numeric keypad or with a virtual key corresponding to the numeric keypad.
static int	KEY_LOCATION_RIGHT A constant indicating that the key pressed or released is in the right key location (there is more than one possible location for this key).
static int	KEY_LOCATION_STANDARD A constant indicating that the key pressed or released is not distinguished as the left or right version of a key, and did not originate on the numeric keypad (or did not originate with a virtual key corresponding to the numeric keypad).
static int	KEY_LOCATION_UNKNOWN A constant indicating that the keyLocation is indeterminate or not relevant.
static int	KEY_PRESSED The "key pressed" event.
static int	KEY_RELEASED The "key released" event.
static int	KEY_TYPED The "key typed" event.
(package private) char	keyChar keyChar is a valid unicode character that is fired by a key or a key combination on a keyboard.
(package private) int	keyCode The unique value assigned to each of the keys on the keyboard.
(package private) int	keyLocation The location of the key on the keyboard.
private static long	serialVersionUID
static int	VK_0 VK_0 thru VK_9 are the same as ASCII '0' thru '9' (0x30 - 0x39)
static int	VK_1
static int	VK_2
static int	VK_3
static int	VK_4
static int	VK_5
static int	VK_6
static int	VK_7
static int	VK_8
static int	VK_9
static int	VK_A VK_A thru VK_Z are the same as ASCII 'A' thru 'Z' (0x41 - 0x5A)
static int	VK_ACCEPT Constant for the Accept or Commit function key.
static int	VK_ADD
static int	VK_AGAIN
static int	VK_ALL_CANDIDATES Constant for the All Candidates function key.
static int	VK_ALPHANUMERIC Constant for the Alphanumeric function key.
static int	VK_ALT
static int	VK_ALT_GRAPH Constant for the AltGraph function key.
static int	VK_AMPERSAND
static int	VK_ASTERISK
static int	VK_AT Constant for the "@" key.
static int	VK_B
static int	VK_BACK_QUOTE
static int	VK_BACK_SLASH
static int	VK_BACK_SPACE
static int	VK_BRACELEFT
static int	VK_BRACERIGHT
static int	VK_C
static int	VK_CANCEL
static int	VK_CAPS_LOCK
static int	VK_CIRCUMFLEX Constant for the "^" key.
static int	VK_CLEAR
static int	VK_CLOSE_BRACKET
static int	VK_CODE_INPUT Constant for the Code Input function key.
static int	VK_COLON Constant for the ":" key.
static int	VK_COMMA
static int	VK_COMPOSE Constant for the Compose function key.
static int	VK_CONTROL
static int	VK_CONVERT Constant for the Convert function key.
static int	VK_COPY
static int	VK_CUT
static int	VK_D
static int	VK_DEAD_ABOVEDOT
static int	VK_DEAD_ABOVERING
static int	VK_DEAD_ACUTE
static int	VK_DEAD_BREVE
static int	VK_DEAD_CARON
static int	VK_DEAD_CEDILLA
static int	VK_DEAD_CIRCUMFLEX
static int	VK_DEAD_DIAERESIS
static int	VK_DEAD_DOUBLEACUTE
static int	VK_DEAD_GRAVE
static int	VK_DEAD_IOTA
static int	VK_DEAD_MACRON
static int	VK_DEAD_OGONEK
static int	VK_DEAD_SEMIVOICED_SOUND
static int	VK_DEAD_TILDE
static int	VK_DEAD_VOICED_SOUND
static int	VK_DECIMAL
static int	VK_DELETE
static int	VK_DIVIDE
static int	VK_DOLLAR Constant for the "$" key.
static int	VK_DOWN Constant for the non-numpad down arrow key.
static int	VK_E
static int	VK_END
static int	VK_ENTER
static int	VK_EQUALS
static int	VK_ESCAPE
static int	VK_EURO_SIGN Constant for the Euro currency sign key.
static int	VK_EXCLAMATION_MARK Constant for the "!"
static int	VK_F
static int	VK_F1 Constant for the F1 function key.
static int	VK_F10 Constant for the F10 function key.
static int	VK_F11 Constant for the F11 function key.
static int	VK_F12 Constant for the F12 function key.
static int	VK_F13 Constant for the F13 function key.
static int	VK_F14 Constant for the F14 function key.
static int	VK_F15 Constant for the F15 function key.
static int	VK_F16 Constant for the F16 function key.
static int	VK_F17 Constant for the F17 function key.
static int	VK_F18 Constant for the F18 function key.
static int	VK_F19 Constant for the F19 function key.
static int	VK_F2 Constant for the F2 function key.
static int	VK_F20 Constant for the F20 function key.
static int	VK_F21 Constant for the F21 function key.
static int	VK_F22 Constant for the F22 function key.
static int	VK_F23 Constant for the F23 function key.
static int	VK_F24 Constant for the F24 function key.
static int	VK_F3 Constant for the F3 function key.
static int	VK_F4 Constant for the F4 function key.
static int	VK_F5 Constant for the F5 function key.
static int	VK_F6 Constant for the F6 function key.
static int	VK_F7 Constant for the F7 function key.
static int	VK_F8 Constant for the F8 function key.
static int	VK_F9 Constant for the F9 function key.
static int	VK_FINAL
static int	VK_FIND
static int	VK_FULL_WIDTH Constant for the Full-Width Characters function key.
static int	VK_G
static int	VK_GREATER
static int	VK_H
static int	VK_HALF_WIDTH Constant for the Half-Width Characters function key.
static int	VK_HELP
static int	VK_HIRAGANA Constant for the Hiragana function key.
static int	VK_HOME
static int	VK_I
static int	VK_INPUT_METHOD_ON_OFF Constant for the input method on/off key.
static int	VK_INSERT
static int	VK_INVERTED_EXCLAMATION_MARK Constant for the inverted exclamation mark key.
static int	VK_J
static int	VK_JAPANESE_HIRAGANA Constant for the Japanese-Hiragana function key.
static int	VK_JAPANESE_KATAKANA Constant for the Japanese-Katakana function key.
static int	VK_JAPANESE_ROMAN Constant for the Japanese-Roman function key.
static int	VK_K
static int	VK_KANA
static int	VK_KANA_LOCK Constant for the locking Kana function key.
static int	VK_KANJI
static int	VK_KATAKANA Constant for the Katakana function key.
static int	VK_KP_DOWN Constant for the numeric keypad down arrow key.
static int	VK_KP_LEFT Constant for the numeric keypad left arrow key.
static int	VK_KP_RIGHT Constant for the numeric keypad right arrow key.
static int	VK_KP_UP Constant for the numeric keypad up arrow key.
static int	VK_L
static int	VK_LEFT Constant for the non-numpad left arrow key.
static int	VK_LEFT_PARENTHESIS Constant for the "(" key.
static int	VK_LESS
static int	VK_M
static int	VK_META
static int	VK_MINUS Constant for the "-" key.
static int	VK_MODECHANGE
static int	VK_MULTIPLY
static int	VK_N
static int	VK_NONCONVERT Constant for the Don't Convert function key.
static int	VK_NUM_LOCK
static int	VK_NUMBER_SIGN Constant for the "#" key.
static int	VK_NUMPAD0
static int	VK_NUMPAD1
static int	VK_NUMPAD2
static int	VK_NUMPAD3
static int	VK_NUMPAD4
static int	VK_NUMPAD5
static int	VK_NUMPAD6
static int	VK_NUMPAD7
static int	VK_NUMPAD8
static int	VK_NUMPAD9
static int	VK_O
static int	VK_OPEN_BRACKET
static int	VK_P
static int	VK_PAGE_DOWN
static int	VK_PAGE_UP
static int	VK_PASTE
static int	VK_PAUSE
static int	VK_PERIOD
static int	VK_PLUS Constant for the "+" key.
static int	VK_PREVIOUS_CANDIDATE Constant for the Previous Candidate function key.
static int	VK_PRINTSCREEN
static int	VK_PROPS
static int	VK_Q
static int	VK_QUOTE
static int	VK_QUOTEDBL
static int	VK_R
static int	VK_RIGHT Constant for the non-numpad right arrow key.
static int	VK_RIGHT_PARENTHESIS Constant for the ")" key.
static int	VK_ROMAN_CHARACTERS Constant for the Roman Characters function key.
static int	VK_S
static int	VK_SCROLL_LOCK
static int	VK_SEMICOLON
static int	VK_SEPARATER This constant is obsolete, and is included only for backwards compatibility.
static int	VK_SEPARATOR Constant for the Numpad Separator key.
static int	VK_SHIFT
static int	VK_SLASH
static int	VK_SPACE
static int	VK_STOP
static int	VK_SUBTRACT
static int	VK_T
static int	VK_TAB
static int	VK_U
static int	VK_UNDEFINED This value is used to indicate that the keyCode is unknown.
static int	VK_UNDERSCORE Constant for the "_" key.
static int	VK_UNDO
static int	VK_UP Constant for the non-numpad up arrow key.
static int	VK_V
static int	VK_W
static int	VK_X
static int	VK_Y
static int	VK_Z

Fields inherited from class java.awt.event.InputEvent

ALT_DOWN_MASK, ALT_GRAPH_DOWN_MASK, ALT_GRAPH_MASK, ALT_MASK, BUTTON1_DOWN_MASK, BUTTON1_MASK, BUTTON2_DOWN_MASK, BUTTON2_MASK, BUTTON3_DOWN_MASK, BUTTON3_MASK, CTRL_DOWN_MASK, CTRL_MASK, JDK_1_3_MODIFIERS, META_DOWN_MASK, META_MASK, modifiers, SHIFT_DOWN_MASK, SHIFT_MASK, when

Fields inherited from class java.awt.event.ComponentEvent

COMPONENT_FIRST, COMPONENT_HIDDEN, COMPONENT_LAST, COMPONENT_MOVED, COMPONENT_RESIZED, COMPONENT_SHOWN

Fields inherited from class java.awt.AWTEvent

ACTION_EVENT_MASK, ADJUSTMENT_EVENT_MASK, COMPONENT_EVENT_MASK, consumed, CONTAINER_EVENT_MASK, FOCUS_EVENT_MASK, HIERARCHY_BOUNDS_EVENT_MASK, HIERARCHY_EVENT_MASK, id, INPUT_METHOD_EVENT_MASK, INVOCATION_EVENT_MASK, ITEM_EVENT_MASK, KEY_EVENT_MASK, MOUSE_EVENT_MASK, MOUSE_MOTION_EVENT_MASK, MOUSE_WHEEL_EVENT_MASK, PAINT_EVENT_MASK, RESERVED_ID_MAX, TEXT_EVENT_MASK, WINDOW_EVENT_MASK, WINDOW_FOCUS_EVENT_MASK, WINDOW_STATE_EVENT_MASK

Fields inherited from class java.util.EventObject

source

Constructor Summary

	KeyEvent(Component source, int id, long when, int modifiers, int keyCode) Deprecated. as of JDK1.1
	KeyEvent(Component source, int id, long when, int modifiers, int keyCode, char keyChar) Constructs a KeyEvent object.
	KeyEvent(Component source, int id, long when, int modifiers, int keyCode, char keyChar, int keyLocation)
private	KeyEvent(Component source, int id, long when, int modifiers, int keyCode, char keyChar, int keyLocation, boolean isProxyActive) Constructs a KeyEvent object.

Method Summary

char	getKeyChar() Returns the character associated with the key in this event.
int	getKeyCode() Returns the integer keyCode associated with the key in this event.
int	getKeyLocation() Returns the location of the key that originated this key event.
static String	getKeyModifiersText(int modifiers) Returns a String describing the modifier key(s), such as "Shift", or "Ctrl+Shift".
static String	getKeyText(int keyCode) Returns a String describing the keyCode, such as "HOME", "F1" or "A".
private static void	initIDs() Initialize JNI field and method IDs for fields that may be accessed from C.
boolean	isActionKey() Returns whether the key in this event is an "action" key.
String	paramString() Returns a parameter string identifying this event.
private void	readObject(ObjectInputStream s) Sets new modifiers by the old ones.
void	setKeyChar(char keyChar) Set the keyChar value to indicate a logical character.
void	setKeyCode(int keyCode) Set the keyCode value to indicate a physical key.
void	setModifiers(int modifiers) Deprecated. as of JDK1.1.4
private void	setNewModifiers() Sets new modifiers by the old ones.
private void	setOldModifiers() Sets old modifiers by the new ones.

Methods inherited from class java.awt.event.InputEvent

consume, getModifiers, getModifiersEx, getModifiersExText, getWhen, isAltDown, isAltGraphDown, isConsumed, isControlDown, isMetaDown, isShiftDown

Methods inherited from class java.awt.event.ComponentEvent

getComponent

Methods inherited from class java.awt.AWTEvent

getID, setSource, toString

Methods inherited from class java.util.EventObject

getSource

Methods inherited from class java.lang.Object

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

Field Detail

isProxyActive

private boolean isProxyActive

Stores the state of native event dispatching system - true, if when the event was created event proxying mechanism was active - false, if it was inactive Used in Component.dispatchEventImpl to correctly dispatch events when proxy is active

KEY_FIRST

public static final int KEY_FIRST

The first number in the range of ids used for key events.

See Also:

Constant Field Values

KEY_LAST

public static final int KEY_LAST

The last number in the range of ids used for key events.

See Also:

Constant Field Values

KEY_TYPED

public static final int KEY_TYPED

The "key typed" event. This event is generated when a character is entered. In the simplest case, it is produced by a single key press. Often, however, characters are produced by series of key presses, and the mapping from key pressed events to key typed events may be many-to-one or many-to-many.

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Constant Field Values

KEY_PRESSED

public static final int KEY_PRESSED

The "key pressed" event. This event is generated when a key is pushed down.

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KEY_RELEASED

public static final int KEY_RELEASED

The "key released" event. This event is generated when a key is let up.

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Constant Field Values

VK_ENTER

public static final int VK_ENTER

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VK_BACK_SPACE

public static final int VK_BACK_SPACE

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VK_TAB

public static final int VK_TAB

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VK_CANCEL

public static final int VK_CANCEL

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VK_CLEAR

public static final int VK_CLEAR

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VK_SHIFT

public static final int VK_SHIFT

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VK_CONTROL

public static final int VK_CONTROL

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VK_ALT

public static final int VK_ALT

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VK_PAUSE

public static final int VK_PAUSE

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VK_CAPS_LOCK

public static final int VK_CAPS_LOCK

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VK_ESCAPE

public static final int VK_ESCAPE

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VK_SPACE

public static final int VK_SPACE

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VK_PAGE_UP

public static final int VK_PAGE_UP

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VK_PAGE_DOWN

public static final int VK_PAGE_DOWN

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VK_END

public static final int VK_END

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VK_HOME

public static final int VK_HOME

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VK_LEFT

public static final int VK_LEFT

Constant for the non-numpad left arrow key.

See Also:

VK_KP_LEFT, Constant Field Values

VK_UP

public static final int VK_UP

Constant for the non-numpad up arrow key.

See Also:

VK_KP_UP, Constant Field Values

VK_RIGHT

public static final int VK_RIGHT

Constant for the non-numpad right arrow key.

See Also:

VK_KP_RIGHT, Constant Field Values

VK_DOWN

public static final int VK_DOWN

Constant for the non-numpad down arrow key.

See Also:

VK_KP_DOWN, Constant Field Values

VK_COMMA

public static final int VK_COMMA

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VK_MINUS

public static final int VK_MINUS

Constant for the "-" key.

Since:

1.2

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VK_PERIOD

public static final int VK_PERIOD

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VK_SLASH

public static final int VK_SLASH

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VK_0

public static final int VK_0

VK_0 thru VK_9 are the same as ASCII '0' thru '9' (0x30 - 0x39)

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VK_1

public static final int VK_1

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VK_2

public static final int VK_2

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VK_3

public static final int VK_3

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VK_4

public static final int VK_4

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VK_5

public static final int VK_5

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VK_6

public static final int VK_6

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VK_7

public static final int VK_7

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VK_8

public static final int VK_8

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VK_9

public static final int VK_9

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VK_SEMICOLON

public static final int VK_SEMICOLON

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VK_EQUALS

public static final int VK_EQUALS

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VK_A

public static final int VK_A

VK_A thru VK_Z are the same as ASCII 'A' thru 'Z' (0x41 - 0x5A)

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VK_B

public static final int VK_B

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VK_C

public static final int VK_C

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VK_D

public static final int VK_D

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VK_E

public static final int VK_E

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VK_F

public static final int VK_F

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VK_G

public static final int VK_G

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VK_H

public static final int VK_H

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VK_I

public static final int VK_I

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VK_J

public static final int VK_J

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VK_K

public static final int VK_K

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VK_L

public static final int VK_L

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VK_M

public static final int VK_M

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VK_N

public static final int VK_N

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VK_O

public static final int VK_O

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VK_P

public static final int VK_P

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VK_Q

public static final int VK_Q

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VK_R

public static final int VK_R

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VK_S

public static final int VK_S

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VK_T

public static final int VK_T

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VK_U

public static final int VK_U

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VK_V

public static final int VK_V

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VK_W

public static final int VK_W

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VK_X

public static final int VK_X

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VK_Y

public static final int VK_Y

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VK_Z

public static final int VK_Z

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VK_OPEN_BRACKET

public static final int VK_OPEN_BRACKET

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VK_BACK_SLASH

public static final int VK_BACK_SLASH

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VK_CLOSE_BRACKET

public static final int VK_CLOSE_BRACKET

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VK_NUMPAD0

public static final int VK_NUMPAD0

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VK_NUMPAD1

public static final int VK_NUMPAD1

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VK_NUMPAD2

public static final int VK_NUMPAD2

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VK_NUMPAD3

public static final int VK_NUMPAD3

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VK_NUMPAD4

public static final int VK_NUMPAD4

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VK_NUMPAD5

public static final int VK_NUMPAD5

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VK_NUMPAD6

public static final int VK_NUMPAD6

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VK_NUMPAD7

public static final int VK_NUMPAD7

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VK_NUMPAD8

public static final int VK_NUMPAD8

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VK_NUMPAD9

public static final int VK_NUMPAD9

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VK_MULTIPLY

public static final int VK_MULTIPLY

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VK_ADD

public static final int VK_ADD

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VK_SEPARATER

public static final int VK_SEPARATER

This constant is obsolete, and is included only for backwards compatibility.

See Also:

VK_SEPARATOR, Constant Field Values

VK_SEPARATOR

public static final int VK_SEPARATOR

Constant for the Numpad Separator key.

Since:

1.4

See Also:

Constant Field Values

VK_SUBTRACT

public static final int VK_SUBTRACT

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VK_DECIMAL

public static final int VK_DECIMAL

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VK_DIVIDE

public static final int VK_DIVIDE

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VK_DELETE

public static final int VK_DELETE

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VK_NUM_LOCK

public static final int VK_NUM_LOCK

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VK_SCROLL_LOCK

public static final int VK_SCROLL_LOCK

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VK_F1

public static final int VK_F1

Constant for the F1 function key.

See Also:

Constant Field Values

VK_F2

public static final int VK_F2

Constant for the F2 function key.

See Also:

Constant Field Values

VK_F3

public static final int VK_F3

Constant for the F3 function key.

See Also:

Constant Field Values

VK_F4

public static final int VK_F4

Constant for the F4 function key.

See Also:

Constant Field Values

VK_F5

public static final int VK_F5

Constant for the F5 function key.

See Also:

Constant Field Values

VK_F6

public static final int VK_F6

Constant for the F6 function key.

See Also:

Constant Field Values

VK_F7

public static final int VK_F7

Constant for the F7 function key.

See Also:

Constant Field Values

VK_F8

public static final int VK_F8

Constant for the F8 function key.

See Also:

Constant Field Values

VK_F9

public static final int VK_F9

Constant for the F9 function key.

See Also:

Constant Field Values

VK_F10

public static final int VK_F10

Constant for the F10 function key.

See Also:

Constant Field Values

VK_F11

public static final int VK_F11

Constant for the F11 function key.

See Also:

Constant Field Values

VK_F12

public static final int VK_F12

Constant for the F12 function key.

See Also:

Constant Field Values

VK_F13

public static final int VK_F13

Constant for the F13 function key.

Since:

1.2

See Also:

Constant Field Values

VK_F14

public static final int VK_F14

Constant for the F14 function key.

Since:

1.2

See Also:

Constant Field Values

VK_F15

public static final int VK_F15

Constant for the F15 function key.

Since:

1.2

See Also:

Constant Field Values

VK_F16

public static final int VK_F16

Constant for the F16 function key.

Since:

1.2

See Also:

Constant Field Values

VK_F17

public static final int VK_F17

Constant for the F17 function key.

Since:

1.2

See Also:

Constant Field Values

VK_F18

public static final int VK_F18

Constant for the F18 function key.

Since:

1.2

See Also:

Constant Field Values

VK_F19

public static final int VK_F19

Constant for the F19 function key.

Since:

1.2

See Also:

Constant Field Values

VK_F20

public static final int VK_F20

Constant for the F20 function key.

Since:

1.2

See Also:

Constant Field Values

VK_F21

public static final int VK_F21

Constant for the F21 function key.

Since:

1.2

See Also:

Constant Field Values

VK_F22

public static final int VK_F22

Constant for the F22 function key.

Since:

1.2

See Also:

Constant Field Values

VK_F23

public static final int VK_F23

Constant for the F23 function key.

Since:

1.2

See Also:

Constant Field Values

VK_F24

public static final int VK_F24

Constant for the F24 function key.

Since:

1.2

See Also:

Constant Field Values

VK_PRINTSCREEN

public static final int VK_PRINTSCREEN

See Also:

Constant Field Values

VK_INSERT

public static final int VK_INSERT

See Also:

Constant Field Values

VK_HELP

public static final int VK_HELP

See Also:

Constant Field Values

VK_META

public static final int VK_META

See Also:

Constant Field Values

VK_BACK_QUOTE

public static final int VK_BACK_QUOTE

See Also:

Constant Field Values

VK_QUOTE

public static final int VK_QUOTE

See Also:

Constant Field Values

VK_KP_UP

public static final int VK_KP_UP

Constant for the numeric keypad up arrow key.

Since:

1.2

See Also:

VK_UP, Constant Field Values

VK_KP_DOWN

public static final int VK_KP_DOWN

Constant for the numeric keypad down arrow key.

Since:

1.2

See Also:

VK_DOWN, Constant Field Values

VK_KP_LEFT

public static final int VK_KP_LEFT

Constant for the numeric keypad left arrow key.

Since:

1.2

See Also:

VK_LEFT, Constant Field Values

VK_KP_RIGHT

public static final int VK_KP_RIGHT

Constant for the numeric keypad right arrow key.

Since:

1.2

See Also:

VK_RIGHT, Constant Field Values

VK_DEAD_GRAVE

public static final int VK_DEAD_GRAVE

Since:

1.2

See Also:

Constant Field Values

VK_DEAD_ACUTE

public static final int VK_DEAD_ACUTE

Since:

1.2

See Also:

Constant Field Values

VK_DEAD_CIRCUMFLEX

public static final int VK_DEAD_CIRCUMFLEX

Since:

1.2

See Also:

Constant Field Values

VK_DEAD_TILDE

public static final int VK_DEAD_TILDE

Since:

1.2

See Also:

Constant Field Values

VK_DEAD_MACRON

public static final int VK_DEAD_MACRON

Since:

1.2

See Also:

Constant Field Values

VK_DEAD_BREVE

public static final int VK_DEAD_BREVE

Since:

1.2

See Also:

Constant Field Values

VK_DEAD_ABOVEDOT

public static final int VK_DEAD_ABOVEDOT

Since:

1.2

See Also:

Constant Field Values

VK_DEAD_DIAERESIS

public static final int VK_DEAD_DIAERESIS

Since:

1.2

See Also:

Constant Field Values

VK_DEAD_ABOVERING

public static final int VK_DEAD_ABOVERING

Since:

1.2

See Also:

Constant Field Values

VK_DEAD_DOUBLEACUTE

public static final int VK_DEAD_DOUBLEACUTE

Since:

1.2

See Also:

Constant Field Values

VK_DEAD_CARON

public static final int VK_DEAD_CARON

Since:

1.2

See Also:

Constant Field Values

VK_DEAD_CEDILLA

public static final int VK_DEAD_CEDILLA

Since:

1.2

See Also:

Constant Field Values

VK_DEAD_OGONEK

public static final int VK_DEAD_OGONEK

Since:

1.2

See Also:

Constant Field Values

VK_DEAD_IOTA

public static final int VK_DEAD_IOTA

Since:

1.2

See Also:

Constant Field Values

VK_DEAD_VOICED_SOUND

public static final int VK_DEAD_VOICED_SOUND

Since:

1.2

See Also:

Constant Field Values

VK_DEAD_SEMIVOICED_SOUND

public static final int VK_DEAD_SEMIVOICED_SOUND

Since:

1.2

See Also:

Constant Field Values

VK_AMPERSAND

public static final int VK_AMPERSAND

Since:

1.2

See Also:

Constant Field Values

VK_ASTERISK

public static final int VK_ASTERISK

Since:

1.2

See Also:

Constant Field Values

VK_QUOTEDBL

public static final int VK_QUOTEDBL

Since:

1.2

See Also:

Constant Field Values

VK_LESS

public static final int VK_LESS

Since:

1.2

See Also:

Constant Field Values

VK_GREATER

public static final int VK_GREATER

Since:

1.2

See Also:

Constant Field Values

VK_BRACELEFT

public static final int VK_BRACELEFT

Since:

1.2

See Also:

Constant Field Values

VK_BRACERIGHT

public static final int VK_BRACERIGHT

Since:

1.2

See Also:

Constant Field Values

VK_AT

public static final int VK_AT

Constant for the "@" key.

Since:

1.2

See Also:

Constant Field Values

VK_COLON

public static final int VK_COLON

Constant for the ":" key.

Since:

1.2

See Also:

Constant Field Values

VK_CIRCUMFLEX

public static final int VK_CIRCUMFLEX

Constant for the "^" key.

Since:

1.2

See Also:

Constant Field Values

VK_DOLLAR

public static final int VK_DOLLAR

Constant for the "$" key.

Since:

1.2

See Also:

Constant Field Values

VK_EURO_SIGN

public static final int VK_EURO_SIGN

Constant for the Euro currency sign key.

Since:

1.2

See Also:

Constant Field Values

VK_EXCLAMATION_MARK

public static final int VK_EXCLAMATION_MARK

Constant for the "!" key.

Since:

1.2

See Also:

Constant Field Values

VK_INVERTED_EXCLAMATION_MARK

public static final int VK_INVERTED_EXCLAMATION_MARK

Constant for the inverted exclamation mark key.

Since:

1.2

See Also:

Constant Field Values

VK_LEFT_PARENTHESIS

public static final int VK_LEFT_PARENTHESIS

Constant for the "(" key.

Since:

1.2

See Also:

Constant Field Values

VK_NUMBER_SIGN

public static final int VK_NUMBER_SIGN

Constant for the "#" key.

Since:

1.2

See Also:

Constant Field Values

VK_PLUS

public static final int VK_PLUS

Constant for the "+" key.

Since:

1.2

See Also:

Constant Field Values

VK_RIGHT_PARENTHESIS

public static final int VK_RIGHT_PARENTHESIS

Constant for the ")" key.

Since:

1.2

See Also:

Constant Field Values

VK_UNDERSCORE

public static final int VK_UNDERSCORE

Constant for the "_" key.

Since:

1.2

See Also:

Constant Field Values

VK_FINAL

public static final int VK_FINAL

See Also:

Constant Field Values

VK_CONVERT

public static final int VK_CONVERT

Constant for the Convert function key.

See Also:

Constant Field Values

VK_NONCONVERT

public static final int VK_NONCONVERT

Constant for the Don't Convert function key.

See Also:

Constant Field Values

VK_ACCEPT

public static final int VK_ACCEPT

Constant for the Accept or Commit function key.

See Also:

Constant Field Values

VK_MODECHANGE

public static final int VK_MODECHANGE

See Also:

Constant Field Values

VK_KANA

public static final int VK_KANA

See Also:

Constant Field Values

VK_KANJI

public static final int VK_KANJI

See Also:

Constant Field Values

VK_ALPHANUMERIC

public static final int VK_ALPHANUMERIC

Constant for the Alphanumeric function key.

Since:

1.2

See Also:

Constant Field Values

VK_KATAKANA

public static final int VK_KATAKANA

Constant for the Katakana function key.

Since:

1.2

See Also:

Constant Field Values

VK_HIRAGANA

public static final int VK_HIRAGANA

Constant for the Hiragana function key.

Since:

1.2

See Also:

Constant Field Values

VK_FULL_WIDTH

public static final int VK_FULL_WIDTH

Constant for the Full-Width Characters function key.

Since:

1.2

See Also:

Constant Field Values

VK_HALF_WIDTH

public static final int VK_HALF_WIDTH

Constant for the Half-Width Characters function key.

Since:

1.2

See Also:

Constant Field Values

VK_ROMAN_CHARACTERS

public static final int VK_ROMAN_CHARACTERS

Constant for the Roman Characters function key.

Since:

1.2

See Also:

Constant Field Values

VK_ALL_CANDIDATES

public static final int VK_ALL_CANDIDATES

Constant for the All Candidates function key.

Since:

1.2

See Also:

Constant Field Values

VK_PREVIOUS_CANDIDATE

public static final int VK_PREVIOUS_CANDIDATE

Constant for the Previous Candidate function key.

Since:

1.2

See Also:

Constant Field Values

VK_CODE_INPUT

public static final int VK_CODE_INPUT

Constant for the Code Input function key.

Since:

1.2

See Also:

Constant Field Values

VK_JAPANESE_KATAKANA

public static final int VK_JAPANESE_KATAKANA

Constant for the Japanese-Katakana function key. This key switches to a Japanese input method and selects its Katakana input mode.

Since:

1.2

See Also:

Constant Field Values

VK_JAPANESE_HIRAGANA

public static final int VK_JAPANESE_HIRAGANA

Constant for the Japanese-Hiragana function key. This key switches to a Japanese input method and selects its Hiragana input mode.

Since:

1.2

See Also:

Constant Field Values

VK_JAPANESE_ROMAN

public static final int VK_JAPANESE_ROMAN

Constant for the Japanese-Roman function key. This key switches to a Japanese input method and selects its Roman-Direct input mode.

Since:

1.2

See Also:

Constant Field Values

VK_KANA_LOCK

public static final int VK_KANA_LOCK

Constant for the locking Kana function key. This key locks the keyboard into a Kana layout.

Since:

1.3

See Also:

Constant Field Values

VK_INPUT_METHOD_ON_OFF

public static final int VK_INPUT_METHOD_ON_OFF

Constant for the input method on/off key.

Since:

1.3

See Also:

Constant Field Values

VK_CUT

public static final int VK_CUT

Since:

1.2

See Also:

Constant Field Values

VK_COPY

public static final int VK_COPY

Since:

1.2

See Also:

Constant Field Values

VK_PASTE

public static final int VK_PASTE

Since:

1.2

See Also:

Constant Field Values

VK_UNDO

public static final int VK_UNDO

Since:

1.2

See Also:

Constant Field Values

VK_AGAIN

public static final int VK_AGAIN

Since:

1.2

See Also:

Constant Field Values

VK_FIND

public static final int VK_FIND

Since:

1.2

See Also:

Constant Field Values

VK_PROPS

public static final int VK_PROPS

Since:

1.2

See Also:

Constant Field Values

VK_STOP

public static final int VK_STOP

Since:

1.2

See Also:

Constant Field Values

VK_COMPOSE

public static final int VK_COMPOSE

Constant for the Compose function key.

Since:

1.2

See Also:

Constant Field Values

VK_ALT_GRAPH

public static final int VK_ALT_GRAPH

Constant for the AltGraph function key.

Since:

1.2

See Also:

Constant Field Values

VK_UNDEFINED

public static final int VK_UNDEFINED

This value is used to indicate that the keyCode is unknown. KEY_TYPED events do not have a keyCode value; this value is used instead.

See Also:

Constant Field Values

CHAR_UNDEFINED

public static final char CHAR_UNDEFINED

KEY_PRESSED and KEY_RELEASED events which do not map to a valid Unicode character use this for the keyChar value.

See Also:

Constant Field Values

KEY_LOCATION_UNKNOWN

public static final int KEY_LOCATION_UNKNOWN

A constant indicating that the keyLocation is indeterminate or not relevant. KEY_TYPED events do not have a keyLocation; this value is used instead.

Since:

1.4

See Also:

Constant Field Values

KEY_LOCATION_STANDARD

public static final int KEY_LOCATION_STANDARD

A constant indicating that the key pressed or released is not distinguished as the left or right version of a key, and did not originate on the numeric keypad (or did not originate with a virtual key corresponding to the numeric keypad).

Since:

1.4

See Also:

Constant Field Values

KEY_LOCATION_LEFT

public static final int KEY_LOCATION_LEFT

A constant indicating that the key pressed or released is in the left key location (there is more than one possible location for this key). Example: the left shift key.

Since:

1.4

See Also:

Constant Field Values

KEY_LOCATION_RIGHT

public static final int KEY_LOCATION_RIGHT

A constant indicating that the key pressed or released is in the right key location (there is more than one possible location for this key). Example: the right shift key.

Since:

1.4

See Also:

Constant Field Values

KEY_LOCATION_NUMPAD

public static final int KEY_LOCATION_NUMPAD

A constant indicating that the key event originated on the numeric keypad or with a virtual key corresponding to the numeric keypad.

Since:

1.4

See Also:

Constant Field Values

keyCode

int keyCode

The unique value assigned to each of the keys on the keyboard. There is a common set of key codes that can be fired by most keyboards. The symbolic name for a key code should be used rather than the code value itself.

See Also:

getKeyCode(), setKeyCode(int)

keyChar

char keyChar

keyChar is a valid unicode character that is fired by a key or a key combination on a keyboard.

See Also:

getKeyChar(), setKeyChar(char)

keyLocation

int keyLocation

The location of the key on the keyboard. Some keys occur more than once on a keyboard, e.g. the left and right shift keys. Additionally, some keys occur on the numeric keypad. This variable is used to distinguish such keys. The only legal values are KEY_LOCATION_UNKNOWN, KEY_LOCATION_STANDARD, KEY_LOCATION_LEFT, KEY_LOCATION_RIGHT, and KEY_LOCATION_NUMPAD.

See Also:

getKeyLocation()

serialVersionUID

private static final long serialVersionUID

See Also:

Constant Field Values

Constructor Detail

KeyEvent

private KeyEvent(Component source,
                 int id,
                 long when,
                 int modifiers,
                 int keyCode,
                 char keyChar,
                 int keyLocation,
                 boolean isProxyActive)

Constructs a KeyEvent object.

Note that passing in an invalid id results in unspecified behavior.

Parameters:

source - the Component that originated the event

id - an integer identifying the type of event

when - a long integer that specifies the time the event occurred

modifiers - the modifier keys down during event (shift, ctrl, alt, meta) Either extended _DOWN_MASK or old _MASK modifiers should be used, but both models should not be mixed in one event. Use of the extended modifiers is preferred.

keyCode - the integer code for an actual key, or VK_UNDEFINED (for a key-typed event)

keyChar - the Unicode character generated by this event, or CHAR_UNDEFINED (for key-pressed and key-released events which do not map to a valid Unicode character)

keyLocation - identifies the key location. The only legal values are KEY_LOCATION_UNKNOWN, KEY_LOCATION_STANDARD, KEY_LOCATION_LEFT, KEY_LOCATION_RIGHT, and KEY_LOCATION_NUMPAD.

Throws:

IllegalArgumentException - if id is KEY_TYPED and keyChar is CHAR_UNDEFINED; or if id is KEY_TYPED and keyCode is not VK_UNDEFINED; or if id is KEY_TYPED and keyLocation is not KEY_LOCATION_UNKNOWN; or if keyLocation is not one of the legal values enumerated above.

Since:

1.4

KeyEvent

public KeyEvent(Component source,
                int id,
                long when,
                int modifiers,
                int keyCode,
                char keyChar,
                int keyLocation)

KeyEvent

public KeyEvent(Component source,
                int id,
                long when,
                int modifiers,
                int keyCode,
                char keyChar)

Constructs a KeyEvent object.

Note that passing in an invalid id results in unspecified behavior.

Parameters:

source - the Component that originated the event

id - an integer identifying the type of event

when - a long integer that specifies the time the event occurred

modifiers - the modifier keys down during event (shift, ctrl, alt, meta) Either extended _DOWN_MASK or old _MASK modifiers should be used, but both models should not be mixed in one event. Use of the extended modifiers is preferred.

keyCode - the integer code for an actual key, or VK_UNDEFINED (for a key-typed event)

keyChar - the Unicode character generated by this event, or CHAR_UNDEFINED (for key-pressed and key-released events which do not map to a valid Unicode character)

Throws:

IllegalArgumentException - if id is KEY_TYPED and keyChar is CHAR_UNDEFINED; or if id is KEY_TYPED and keyCode is not VK_UNDEFINED

KeyEvent

public KeyEvent(Component source,
                int id,
                long when,
                int modifiers,
                int keyCode)

Deprecated. as of JDK1.1

Method Detail

initIDs

private static void initIDs()

Initialize JNI field and method IDs for fields that may be accessed from C.

getKeyCode

public int getKeyCode()

Returns the integer keyCode associated with the key in this event.

Returns:

the integer code for an actual key on the keyboard. (For KEY_TYPED events, the keyCode is VK_UNDEFINED.)

setKeyCode

public void setKeyCode(int keyCode)

Set the keyCode value to indicate a physical key.

Parameters:

keyCode - an integer corresponding to an actual key on the keyboard.

getKeyChar

public char getKeyChar()

Returns the character associated with the key in this event. For example, the key-typed event for shift + "a" returns the value for "A".

Returns:

the Unicode character defined for this key event. If no valid Unicode character exists for this key event, keyChar is CHAR_UNDEFINED.

setKeyChar

public void setKeyChar(char keyChar)

Set the keyChar value to indicate a logical character.

Parameters:

keyChar - a char corresponding to to the combination of keystrokes that make up this event.

setModifiers

public void setModifiers(int modifiers)

Deprecated. as of JDK1.1.4

Set the modifiers to indicate additional keys that were held down (e.g. shift, ctrl, alt, meta) defined as part of InputEvent.

NOTE: use of this method is not recommended, because many AWT implementations do not recognize modifier changes. This is especially true for KEY_TYPED events where the shift modifier is changed.

Parameters:

modifiers - an integer combination of the modifier constants.

See Also:

InputEvent

getKeyLocation

public int getKeyLocation()

Returns the location of the key that originated this key event. Some keys occur more than once on a keyboard, e.g. the left and right shift keys. Additionally, some keys occur on the numeric keypad. This provides a way of distinguishing such keys.

Returns:

the location of the key that was pressed or released. Always returns KEY_LOCATION_UNKNOWN for KEY_TYPED events.

Since:

1.4

getKeyText

public static String getKeyText(int keyCode)

Returns a String describing the keyCode, such as "HOME", "F1" or "A". These strings can be localized by changing the awt.properties file.

Returns:

a string containing a text description for a physical key, identified by its keyCode

getKeyModifiersText

public static String getKeyModifiersText(int modifiers)

Returns a String describing the modifier key(s), such as "Shift", or "Ctrl+Shift". These strings can be localized by changing the awt.properties file.

Returns:

string a text description of the combination of modifier keys that were held down during the event

isActionKey

public boolean isActionKey()

Returns whether the key in this event is an "action" key. Typically an action key does not fire a unicode character and is not a modifier key.

Returns:

true if the key is an "action" key, false otherwise

paramString

public String paramString()

Returns a parameter string identifying this event. This method is useful for event logging and for debugging.

Overrides:

paramString in class ComponentEvent

Returns:

a string identifying the event and its attributes

setNewModifiers

private void setNewModifiers()

Sets new modifiers by the old ones. The key modifiers override overlaping mouse modifiers.

setOldModifiers

private void setOldModifiers()

Sets old modifiers by the new ones.

readObject

private void readObject(ObjectInputStream s)
                 throws IOException,
                        ClassNotFoundException

Sets new modifiers by the old ones. The key modifiers override overlaping mouse modifiers.

Throws:

IOException

ClassNotFoundException