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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

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 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 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 (like "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 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 artificially generate these keys.
• Virtual key codes do not identify a physical key, they depend on the platform and keyboard layout. For example, the key that on a Windows U.S. keyboard layout generates VK_Q, generates VK_A on a Windows French keyboard layout.
• 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 modifer.

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.

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.
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_PRESSED The "key pressed" event.
static int	KEY_RELEASED The "key released" event.
static int	KEY_TYPED The "key typed" event.
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
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 modifier 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
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
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 "!" key.
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_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_KANJI
static int	VK_KATAKANA Constant for the Katakana function key.
static int	VK_KP_DOWN
static int	VK_KP_LEFT
static int	VK_KP_RIGHT
static int	VK_KP_UP for KeyPad cursor arrow keys
static int	VK_L
static int	VK_LEFT
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
static int	VK_MODECHANGE
static int	VK_MULTIPLY
static int	VK_N
static int	VK_NONCONVERT
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
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
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 KEY_TYPED events do not have a keyCode value.
static int	VK_UNDERSCORE Constant for the "_" key.
static int	VK_UNDO
static int	VK_UP
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_GRAPH_MASK, ALT_MASK, BUTTON1_MASK, BUTTON2_MASK, BUTTON3_MASK, CTRL_MASK, META_MASK, SHIFT_MASK

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, id, INPUT_METHOD_EVENT_MASK, ITEM_EVENT_MASK, KEY_EVENT_MASK, MOUSE_EVENT_MASK, MOUSE_MOTION_EVENT_MASK, RESERVED_ID_MAX, TEXT_EVENT_MASK, WINDOW_EVENT_MASK

Fields inherited from class java.util.EventObject

source

Constructor Summary

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

KeyEvent(Component source, int id, long when, int modifiers, int keyCode, char keyChar)
Constructs a KeyEvent object.

Method Summary

char	getKeyChar() Returns the character associated with the key in this event.
int	getKeyCode() Returns the integer key-code associated with the key in this 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".
boolean	isActionKey() Returns whether or not the key in this event is an "action" key, as defined in Event.java.
String	paramString() Returns a parameter string identifying this event.
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) Set the modifiers to indicate additional keys that were held down (shift, ctrl, alt, meta) defined as part of InputEvent.

Methods inherited from class java.awt.event.InputEvent

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

Methods inherited from class java.awt.event.ComponentEvent

getComponent

Methods inherited from class java.awt.AWTEvent

finalize, getID, toString

Methods inherited from class java.util.EventObject

getSource

Methods inherited from class java.lang.Object

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

Field Detail

KEY_FIRST

public static final int KEY_FIRST

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

KEY_LAST

public static final int KEY_LAST

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

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.

KEY_PRESSED

public static final int KEY_PRESSED

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

KEY_RELEASED

public static final int KEY_RELEASED

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

VK_ENTER

public static final int VK_ENTER

VK_BACK_SPACE

public static final int VK_BACK_SPACE

VK_TAB

public static final int VK_TAB

VK_CANCEL

public static final int VK_CANCEL

VK_CLEAR

public static final int VK_CLEAR

VK_SHIFT

public static final int VK_SHIFT

VK_CONTROL

public static final int VK_CONTROL

VK_ALT

public static final int VK_ALT

VK_PAUSE

public static final int VK_PAUSE

VK_CAPS_LOCK

public static final int VK_CAPS_LOCK

VK_ESCAPE

public static final int VK_ESCAPE

VK_SPACE

public static final int VK_SPACE

VK_PAGE_UP

public static final int VK_PAGE_UP

VK_PAGE_DOWN

public static final int VK_PAGE_DOWN

VK_END

public static final int VK_END

VK_HOME

public static final int VK_HOME

VK_LEFT

public static final int VK_LEFT

VK_UP

public static final int VK_UP

VK_RIGHT

public static final int VK_RIGHT

VK_DOWN

public static final int VK_DOWN

VK_COMMA

public static final int VK_COMMA

VK_MINUS

public static final int VK_MINUS

VK_PERIOD

public static final int VK_PERIOD

VK_SLASH

public static final int VK_SLASH

VK_0

public static final int VK_0

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

VK_1

public static final int VK_1

VK_2

public static final int VK_2

VK_3

public static final int VK_3

VK_4

public static final int VK_4

VK_5

public static final int VK_5

VK_6

public static final int VK_6

VK_7

public static final int VK_7

VK_8

public static final int VK_8

VK_9

public static final int VK_9

VK_SEMICOLON

public static final int VK_SEMICOLON

VK_EQUALS

public static final int VK_EQUALS

VK_A

public static final int VK_A

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

VK_B

public static final int VK_B

VK_C

public static final int VK_C

VK_D

public static final int VK_D

VK_E

public static final int VK_E

VK_F

public static final int VK_F

VK_G

public static final int VK_G

VK_H

public static final int VK_H

VK_I

public static final int VK_I

VK_J

public static final int VK_J

VK_K

public static final int VK_K

VK_L

public static final int VK_L

VK_M

public static final int VK_M

VK_N

public static final int VK_N

VK_O

public static final int VK_O

VK_P

public static final int VK_P

VK_Q

public static final int VK_Q

VK_R

public static final int VK_R

VK_S

public static final int VK_S

VK_T

public static final int VK_T

VK_U

public static final int VK_U

VK_V

public static final int VK_V

VK_W

public static final int VK_W

VK_X

public static final int VK_X

VK_Y

public static final int VK_Y

VK_Z

public static final int VK_Z

VK_OPEN_BRACKET

public static final int VK_OPEN_BRACKET

VK_BACK_SLASH

public static final int VK_BACK_SLASH

VK_CLOSE_BRACKET

public static final int VK_CLOSE_BRACKET

VK_NUMPAD0

public static final int VK_NUMPAD0

VK_NUMPAD1

public static final int VK_NUMPAD1

VK_NUMPAD2

public static final int VK_NUMPAD2

VK_NUMPAD3

public static final int VK_NUMPAD3

VK_NUMPAD4

public static final int VK_NUMPAD4

VK_NUMPAD5

public static final int VK_NUMPAD5

VK_NUMPAD6

public static final int VK_NUMPAD6

VK_NUMPAD7

public static final int VK_NUMPAD7

VK_NUMPAD8

public static final int VK_NUMPAD8

VK_NUMPAD9

public static final int VK_NUMPAD9

VK_MULTIPLY

public static final int VK_MULTIPLY

VK_ADD

public static final int VK_ADD

VK_SEPARATER

public static final int VK_SEPARATER

VK_SUBTRACT

public static final int VK_SUBTRACT

VK_DECIMAL

public static final int VK_DECIMAL

VK_DIVIDE

public static final int VK_DIVIDE

VK_DELETE

public static final int VK_DELETE

VK_NUM_LOCK

public static final int VK_NUM_LOCK

VK_SCROLL_LOCK

public static final int VK_SCROLL_LOCK

VK_F1

public static final int VK_F1

Constant for the F1 function key.

VK_F2

public static final int VK_F2

Constant for the F2 function key.

VK_F3

public static final int VK_F3

Constant for the F3 function key.

VK_F4

public static final int VK_F4

Constant for the F4 function key.

VK_F5

public static final int VK_F5

Constant for the F5 function key.

VK_F6

public static final int VK_F6

Constant for the F6 function key.

VK_F7

public static final int VK_F7

Constant for the F7 function key.

VK_F8

public static final int VK_F8

Constant for the F8 function key.

VK_F9

public static final int VK_F9

Constant for the F9 function key.

VK_F10

public static final int VK_F10

Constant for the F10 function key.

VK_F11

public static final int VK_F11

Constant for the F11 function key.

VK_F12

public static final int VK_F12

Constant for the F12 function key.

VK_F13

public static final int VK_F13

Constant for the F13 function key.

VK_F14

public static final int VK_F14

Constant for the F14 function key.

VK_F15

public static final int VK_F15

Constant for the F15 function key.

VK_F16

public static final int VK_F16

Constant for the F16 function key.

VK_F17

public static final int VK_F17

Constant for the F17 function key.

VK_F18

public static final int VK_F18

Constant for the F18 function key.

VK_F19

public static final int VK_F19

Constant for the F19 function key.

VK_F20

public static final int VK_F20

Constant for the F20 function key.

VK_F21

public static final int VK_F21

Constant for the F21 function key.

VK_F22

public static final int VK_F22

Constant for the F22 function key.

VK_F23

public static final int VK_F23

Constant for the F23 function key.

VK_F24

public static final int VK_F24

Constant for the F24 function key.

VK_PRINTSCREEN

public static final int VK_PRINTSCREEN

VK_INSERT

public static final int VK_INSERT

VK_HELP

public static final int VK_HELP

VK_META

public static final int VK_META

VK_BACK_QUOTE

public static final int VK_BACK_QUOTE

VK_QUOTE

public static final int VK_QUOTE

VK_KP_UP

public static final int VK_KP_UP

for KeyPad cursor arrow keys

VK_KP_DOWN

public static final int VK_KP_DOWN

VK_KP_LEFT

public static final int VK_KP_LEFT

VK_KP_RIGHT

public static final int VK_KP_RIGHT

VK_DEAD_GRAVE

public static final int VK_DEAD_GRAVE

VK_DEAD_ACUTE

public static final int VK_DEAD_ACUTE

VK_DEAD_CIRCUMFLEX

public static final int VK_DEAD_CIRCUMFLEX

VK_DEAD_TILDE

public static final int VK_DEAD_TILDE

VK_DEAD_MACRON

public static final int VK_DEAD_MACRON

VK_DEAD_BREVE

public static final int VK_DEAD_BREVE

VK_DEAD_ABOVEDOT

public static final int VK_DEAD_ABOVEDOT

VK_DEAD_DIAERESIS

public static final int VK_DEAD_DIAERESIS

VK_DEAD_ABOVERING

public static final int VK_DEAD_ABOVERING

VK_DEAD_DOUBLEACUTE

public static final int VK_DEAD_DOUBLEACUTE

VK_DEAD_CARON

public static final int VK_DEAD_CARON

VK_DEAD_CEDILLA

public static final int VK_DEAD_CEDILLA

VK_DEAD_OGONEK

public static final int VK_DEAD_OGONEK

VK_DEAD_IOTA

public static final int VK_DEAD_IOTA

VK_DEAD_VOICED_SOUND

public static final int VK_DEAD_VOICED_SOUND

VK_DEAD_SEMIVOICED_SOUND

public static final int VK_DEAD_SEMIVOICED_SOUND

VK_AMPERSAND

public static final int VK_AMPERSAND

VK_ASTERISK

public static final int VK_ASTERISK

VK_QUOTEDBL

public static final int VK_QUOTEDBL

VK_LESS

public static final int VK_LESS

VK_GREATER

public static final int VK_GREATER

VK_BRACELEFT

public static final int VK_BRACELEFT

VK_BRACERIGHT

public static final int VK_BRACERIGHT

VK_AT

public static final int VK_AT

Constant for the "@" key.

VK_COLON

public static final int VK_COLON

Constant for the ":" key.

VK_CIRCUMFLEX

public static final int VK_CIRCUMFLEX

Constant for the "^" key.

VK_DOLLAR

public static final int VK_DOLLAR

Constant for the "$" key.

VK_EURO_SIGN

public static final int VK_EURO_SIGN

Constant for the Euro currency sign key.

VK_EXCLAMATION_MARK

public static final int VK_EXCLAMATION_MARK

Constant for the "!" key.

VK_INVERTED_EXCLAMATION_MARK

public static final int VK_INVERTED_EXCLAMATION_MARK

Constant for the inverted exclamation mark key.

VK_LEFT_PARENTHESIS

public static final int VK_LEFT_PARENTHESIS

Constant for the "(" key.

VK_NUMBER_SIGN

public static final int VK_NUMBER_SIGN

Constant for the "#" key.

VK_PLUS

public static final int VK_PLUS

Constant for the "+" key.

VK_RIGHT_PARENTHESIS

public static final int VK_RIGHT_PARENTHESIS

Constant for the ")" key.

VK_UNDERSCORE

public static final int VK_UNDERSCORE

Constant for the "_" key.

VK_FINAL

public static final int VK_FINAL

VK_CONVERT

public static final int VK_CONVERT

VK_NONCONVERT

public static final int VK_NONCONVERT

VK_ACCEPT

public static final int VK_ACCEPT

VK_MODECHANGE

public static final int VK_MODECHANGE

VK_KANA

public static final int VK_KANA

VK_KANJI

public static final int VK_KANJI

VK_ALPHANUMERIC

public static final int VK_ALPHANUMERIC

Constant for the Alphanumeric function key.

VK_KATAKANA

public static final int VK_KATAKANA

Constant for the Katakana function key.

VK_HIRAGANA

public static final int VK_HIRAGANA

Constant for the Hiragana function key.

VK_FULL_WIDTH

public static final int VK_FULL_WIDTH

Constant for the Full-Width Characters function key.

VK_HALF_WIDTH

public static final int VK_HALF_WIDTH

Constant for the Half-Width Characters function key.

VK_ROMAN_CHARACTERS

public static final int VK_ROMAN_CHARACTERS

Constant for the Roman Characters function key.

VK_ALL_CANDIDATES

public static final int VK_ALL_CANDIDATES

Constant for the All Candidates function key.

VK_PREVIOUS_CANDIDATE

public static final int VK_PREVIOUS_CANDIDATE

Constant for the Previous Candidate function key.

VK_CODE_INPUT

public static final int VK_CODE_INPUT

Constant for the Code Input function key.

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.

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.

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.

VK_CUT

public static final int VK_CUT

VK_COPY

public static final int VK_COPY

VK_PASTE

public static final int VK_PASTE

VK_UNDO

public static final int VK_UNDO

VK_AGAIN

public static final int VK_AGAIN

VK_FIND

public static final int VK_FIND

VK_PROPS

public static final int VK_PROPS

VK_STOP

public static final int VK_STOP

VK_COMPOSE

public static final int VK_COMPOSE

Constant for the Compose function key.

VK_ALT_GRAPH

public static final int VK_ALT_GRAPH

Constant for the AltGraph modifier key.

VK_UNDEFINED

public static final int VK_UNDEFINED

KEY_TYPED events do not have a keyCode value. This value is used, instead.

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.

Constructor Detail

KeyEvent

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

Constructs a KeyEvent object.

Parameters:

source - the Component that originated the event

id - an integer identifying the type of event

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

modifiers - the modifier keys down during event (shift, ctrl, alt, meta)

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)

KeyEvent

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

Method Detail

getKeyCode

public int getKeyCode()

Returns the integer key-code associated with the key in this event.

Returns:

the integer code for an actual key on the keyboard. (For KEY_TYPED events, 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.

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)

Set the modifiers to indicate additional keys that were held down (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

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.

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:

string 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 or not the key in this event is an "action" key, as defined in Event.java.

Returns:

boolean value, true if the key is an "action" key

See Also:

Event

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