Class Event

public class Event
extends Object
implements Serializable

NOTE: The Event class is obsolete and is available only for backwards compatibility. It has been replaced by the AWTEvent class and its subclasses.

Event is a platform-independent class that encapsulates events from the platform's Graphical User Interface in the Java 1.0 event model. In Java 1.1 and later versions, the Event class is maintained only for backwards compatibility. The information in this class description is provided to assist programmers in converting Java 1.0 programs to the new event model.

In the Java 1.0 event model, an event contains an id field that indicates what type of event it is and which other Event variables are relevant for the event.

For keyboard events, key contains a value indicating which key was activated, and modifiers contains the modifiers for that event. For the KEY_PRESS and KEY_RELEASE event ids, the value of key is the unicode character code for the key. For KEY_ACTION and KEY_ACTION_RELEASE, the value of key is one of the defined action-key identifiers in the Event class (PGUP, PGDN, F1, F2, etc).

Fields

SHIFT_MASK

public static final int SHIFT_MASK

This flag indicates that the Shift key was down when the event occurred.

See Also:

Constant Field Values

CTRL_MASK

public static final int CTRL_MASK

This flag indicates that the Control key was down when the event occurred.

See Also:

Constant Field Values

META_MASK

public static final int META_MASK

This flag indicates that the Meta key was down when the event occurred. For mouse events, this flag indicates that the right button was pressed or released.

See Also:

Constant Field Values

ALT_MASK

public static final int ALT_MASK

This flag indicates that the Alt key was down when the event occurred. For mouse events, this flag indicates that the middle mouse button was pressed or released.

See Also:

Constant Field Values

HOME

public static final int HOME

The Home key, a non-ASCII action key.

See Also:

Constant Field Values

END

public static final int END

The End key, a non-ASCII action key.

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Constant Field Values

PGUP

public static final int PGUP

The Page Up key, a non-ASCII action key.

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Constant Field Values

PGDN

public static final int PGDN

The Page Down key, a non-ASCII action key.

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Constant Field Values

UP

public static final int UP

The Up Arrow key, a non-ASCII action key.

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Constant Field Values

DOWN

public static final int DOWN

The Down Arrow key, a non-ASCII action key.

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Constant Field Values

LEFT

public static final int LEFT

The Left Arrow key, a non-ASCII action key.

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Constant Field Values

RIGHT

public static final int RIGHT

The Right Arrow key, a non-ASCII action key.

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Constant Field Values

F1

public static final int F1

The F1 function key, a non-ASCII action key.

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Constant Field Values

F2

public static final int F2

The F2 function key, a non-ASCII action key.

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Constant Field Values

F3

public static final int F3

The F3 function key, a non-ASCII action key.

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Constant Field Values

F4

public static final int F4

The F4 function key, a non-ASCII action key.

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Constant Field Values

F5

public static final int F5

The F5 function key, a non-ASCII action key.

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Constant Field Values

F6

public static final int F6

The F6 function key, a non-ASCII action key.

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Constant Field Values

F7

public static final int F7

The F7 function key, a non-ASCII action key.

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Constant Field Values

F8

public static final int F8

The F8 function key, a non-ASCII action key.

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Constant Field Values

F9

public static final int F9

The F9 function key, a non-ASCII action key.

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Constant Field Values

F10

public static final int F10

The F10 function key, a non-ASCII action key.

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Constant Field Values

F11

public static final int F11

The F11 function key, a non-ASCII action key.

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Constant Field Values

F12

public static final int F12

The F12 function key, a non-ASCII action key.

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Constant Field Values

PRINT_SCREEN

public static final int PRINT_SCREEN

The Print Screen key, a non-ASCII action key.

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Constant Field Values

SCROLL_LOCK

public static final int SCROLL_LOCK

The Scroll Lock key, a non-ASCII action key.

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Constant Field Values

CAPS_LOCK

public static final int CAPS_LOCK

The Caps Lock key, a non-ASCII action key.

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Constant Field Values

NUM_LOCK

public static final int NUM_LOCK

The Num Lock key, a non-ASCII action key.

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Constant Field Values

PAUSE

public static final int PAUSE

The Pause key, a non-ASCII action key.

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Constant Field Values

INSERT

public static final int INSERT

The Insert key, a non-ASCII action key.

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Constant Field Values

ENTER

public static final int ENTER

The Enter key.

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Constant Field Values

BACK_SPACE

public static final int BACK_SPACE

The BackSpace key.

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Constant Field Values

TAB

public static final int TAB

The Tab key.

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Constant Field Values

ESCAPE

public static final int ESCAPE

The Escape key.

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Constant Field Values

DELETE

public static final int DELETE

The Delete key.

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Constant Field Values

WINDOW_DESTROY

public static final int WINDOW_DESTROY

The user has asked the window manager to kill the window.

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Constant Field Values

WINDOW_EXPOSE

public static final int WINDOW_EXPOSE

The user has asked the window manager to expose the window.

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Constant Field Values

WINDOW_ICONIFY

public static final int WINDOW_ICONIFY

The user has asked the window manager to iconify the window.

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Constant Field Values

WINDOW_DEICONIFY

public static final int WINDOW_DEICONIFY

The user has asked the window manager to de-iconify the window.

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Constant Field Values

WINDOW_MOVED

public static final int WINDOW_MOVED

The user has asked the window manager to move the window.

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Constant Field Values

KEY_PRESS

public static final int KEY_PRESS

The user has pressed a normal key.

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Constant Field Values

KEY_RELEASE

public static final int KEY_RELEASE

The user has released a normal key.

See Also:

Constant Field Values

KEY_ACTION

public static final int KEY_ACTION

The user has pressed a non-ASCII action key. The key field contains a value that indicates that the event occurred on one of the action keys, which comprise the 12 function keys, the arrow (cursor) keys, Page Up, Page Down, Home, End, Print Screen, Scroll Lock, Caps Lock, Num Lock, Pause, and Insert.

See Also:

Constant Field Values

KEY_ACTION_RELEASE

public static final int KEY_ACTION_RELEASE

The user has released a non-ASCII action key. The key field contains a value that indicates that the event occurred on one of the action keys, which comprise the 12 function keys, the arrow (cursor) keys, Page Up, Page Down, Home, End, Print Screen, Scroll Lock, Caps Lock, Num Lock, Pause, and Insert.

See Also:

Constant Field Values

MOUSE_DOWN

public static final int MOUSE_DOWN

The user has pressed the mouse button. The ALT_MASK flag indicates that the middle button has been pressed. The META_MASKflag indicates that the right button has been pressed.

See Also:

ALT_MASK, META_MASK, Constant Field Values

MOUSE_UP

public static final int MOUSE_UP

The user has released the mouse button. The ALT_MASK flag indicates that the middle button has been released. The META_MASKflag indicates that the right button has been released.

See Also:

ALT_MASK, META_MASK, Constant Field Values

MOUSE_MOVE

public static final int MOUSE_MOVE

The mouse has moved with no button pressed.

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Constant Field Values

MOUSE_ENTER

public static final int MOUSE_ENTER

The mouse has entered a component.

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Constant Field Values

MOUSE_EXIT

public static final int MOUSE_EXIT

The mouse has exited a component.

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Constant Field Values

MOUSE_DRAG

public static final int MOUSE_DRAG

The user has moved the mouse with a button pressed. The ALT_MASK flag indicates that the middle button is being pressed. The META_MASK flag indicates that the right button is being pressed.

See Also:

ALT_MASK, META_MASK, Constant Field Values

SCROLL_LINE_UP

public static final int SCROLL_LINE_UP

The user has activated the line up area of a scroll bar.

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Constant Field Values

SCROLL_LINE_DOWN

public static final int SCROLL_LINE_DOWN

The user has activated the line down area of a scroll bar.

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Constant Field Values

SCROLL_PAGE_UP

public static final int SCROLL_PAGE_UP

The user has activated the page up area of a scroll bar.

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Constant Field Values

SCROLL_PAGE_DOWN

public static final int SCROLL_PAGE_DOWN

The user has activated the page down area of a scroll bar.

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Constant Field Values

SCROLL_ABSOLUTE

public static final int SCROLL_ABSOLUTE

The user has moved the bubble (thumb) in a scroll bar, moving to an "absolute" position, rather than to an offset from the last position.

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Constant Field Values

SCROLL_BEGIN

public static final int SCROLL_BEGIN

The scroll begin event.

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Constant Field Values

SCROLL_END

public static final int SCROLL_END

The scroll end event.

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Constant Field Values

LIST_SELECT

public static final int LIST_SELECT

An item in a list has been selected.

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Constant Field Values

LIST_DESELECT

public static final int LIST_DESELECT

An item in a list has been deselected.

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Constant Field Values

ACTION_EVENT

public static final int ACTION_EVENT

This event indicates that the user wants some action to occur.

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Constant Field Values

LOAD_FILE

public static final int LOAD_FILE

A file loading event.

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Constant Field Values

SAVE_FILE

public static final int SAVE_FILE

A file saving event.

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Constant Field Values

GOT_FOCUS

public static final int GOT_FOCUS

A component gained the focus.

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Constant Field Values

LOST_FOCUS

public static final int LOST_FOCUS

A component lost the focus.

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Constant Field Values

target

public Object target

The target component. This indicates the component over which the event occurred or with which the event is associated. This object has been replaced by AWTEvent.getSource()

See Also:

EventObject.getSource()

when

public long when

The time stamp. Replaced by InputEvent.getWhen().

See Also:

InputEvent.getWhen()

id

public int id

Indicates which type of event the event is, and which other Event variables are relevant for the event. This has been replaced by AWTEvent.getID()

See Also:

AWTEvent.getID()

x

public int x

The x coordinate of the event. Replaced by MouseEvent.getX()

See Also:

MouseEvent.getX()

y

public int y

The y coordinate of the event. Replaced by MouseEvent.getY()

See Also:

MouseEvent.getY()

key

public int key

The key code of the key that was pressed in a keyboard event. This has been replaced by KeyEvent.getKeyCode()

See Also:

KeyEvent.getKeyCode()

modifiers

public int modifiers

The state of the modifier keys. This is replaced with InputEvent.getModifiers() In java 1.1 MouseEvent and KeyEvent are subclasses of InputEvent.

See Also:

InputEvent.getModifiers()

clickCount

public int clickCount

For MOUSE_DOWN events, this field indicates the number of consecutive clicks. For other events, its value is 0. This field has been replaced by MouseEvent.getClickCount().

See Also:

MouseEvent.getClickCount()

arg

public Object arg

An arbitrary argument of the event. The value of this field depends on the type of event. arg has been replaced by event specific property.

evt

public Event evt

The next event. This field is set when putting events into a linked list. This has been replaced by EventQueue.

See Also:

EventQueue

Constructors

Event

public Event(Object target,
             long when,
             int id,
             int x,
             int y,
             int key,
             int modifiers,
             Object arg)

Parameters:

target - the target component.

when - the time stamp.

id - the event type.

x - the x coordinate.

y - the y coordinate.

key - the key pressed in a keyboard event.

modifiers - the state of the modifier keys.

arg - the specified argument.

Event

public Event(Object target,
             long when,
             int id,
             int x,
             int y,
             int key,
             int modifiers)

Parameters:

target - the target component.

when - the time stamp.

id - the event type.

x - the x coordinate.

y - the y coordinate.

key - the key pressed in a keyboard event.

modifiers - the state of the modifier keys.

Event

public Event(Object target,
             int id,
             Object arg)

Parameters:

target - the target component.

id - the event type.

arg - the specified argument.

Methods

translate

public void translate(int dx,
                      int dy)

Parameters:

dx - the distance to translate the x coordinate.

dy - the distance to translate the y coordinate.

shiftDown

public boolean shiftDown()

Returns:

true if the key is down; false otherwise.

See Also:

modifiers, controlDown(), metaDown()

controlDown

public boolean controlDown()

Returns:

true if the key is down; false otherwise.

See Also:

modifiers, shiftDown(), metaDown()

metaDown

public boolean metaDown()

Returns:

true if the key is down; false otherwise.

See Also:

modifiers, shiftDown(), controlDown()

paramString

protected String paramString()

Returns:

the parameter string of this event

toString

public String toString()

Overrides:

toString in class Object

Returns:

a string that represents the event and the values of its member fields.

Since:

JDK1.1

See Also:

paramString()