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Class java.awt.Event

java.lang.Object | +----java.awt.Event
public class Event
extends Object
implements Serializable
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 compatibilty. 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).

Variable Index

o ACTION_EVENT
This event indicates that the user wants some action to occur.
o ALT_MASK
This flag indicates that the Alt key was down when the event occurred.
o arg
An arbitrary argument of the event.
o BACK_SPACE
The BackSpace key.
o CAPS_LOCK
The Caps Lock key, a non-ASCII action key.
o clickCount
For MOUSE_DOWN events, this field indicates the number of consecutive clicks.
o CTRL_MASK
This flag indicates that the Control key was down when the event occurred.
o DELETE
The Delete key.
o DOWN
The Down Arrow key, a non-ASCII action key.
o END
The End key, a non-ASCII action key.
o ENTER
The Enter key.
o ESCAPE
The Escape key.
o evt
The next event.
o F1
The F1 function key, a non-ASCII action key.
o F10
The F10 function key, a non-ASCII action key.
o F11
The F11 function key, a non-ASCII action key.
o F12
The F12 function key, a non-ASCII action key.
o F2
The F2 function key, a non-ASCII action key.
o F3
The F3 function key, a non-ASCII action key.
o F4
The F4 function key, a non-ASCII action key.
o F5
The F5 function key, a non-ASCII action key.
o F6
The F6 function key, a non-ASCII action key.
o F7
The F7 function key, a non-ASCII action key.
o F8
The F8 function key, a non-ASCII action key.
o F9
The F9 function key, a non-ASCII action key.
o GOT_FOCUS
A component gained the focus.
o HOME
The Home key, a non-ASCII action key.
o id
Indicates which type of event the event is, and which other Event variables are relevant for the event.
o INSERT
The Insert key, a non-ASCII action key.
o key
The key code of the key that was pressed in a keyboard event.
o KEY_ACTION
The user has pressed a non-ASCII action key.
o KEY_ACTION_RELEASE
The user has released a non-ASCII action key.
o KEY_PRESS
The user has pressed a normal key.
o KEY_RELEASE
The user has released a normal key.
o LEFT
The Left Arrow key, a non-ASCII action key.
o LIST_DESELECT
An item in a list has been deselected.
o LIST_SELECT
An item in a list has been selected.
o LOAD_FILE
A file loading event.
o LOST_FOCUS
A component lost the focus.
o META_MASK
This flag indicates that the Meta key was down when the event occurred.
o modifiers
The state of the modifier keys.
o MOUSE_DOWN
The user has pressed the mouse button.
o MOUSE_DRAG
The user has moved the mouse with a button pressed.
o MOUSE_ENTER
The mouse has entered a component.
o MOUSE_EXIT
The mouse has exited a component.
o MOUSE_MOVE
The mouse has moved with no button pressed.
o MOUSE_UP
The user has released the mouse button.
o NUM_LOCK
The Num Lock key, a non-ASCII action key.
o PAUSE
The Pause key, a non-ASCII action key.
o PGDN
The Page Down key, a non-ASCII action key.
o PGUP
The Page Up key, a non-ASCII action key.
o PRINT_SCREEN
The Print Screen key, a non-ASCII action key.
o RIGHT
The Right Arrow key, a non-ASCII action key.
o SAVE_FILE
A file saving event.
o 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 postion.
o SCROLL_BEGIN
The scroll begin event.
o SCROLL_END
The scroll end event.
o SCROLL_LINE_DOWN
The user has activated the line down area of a scroll bar.
o SCROLL_LINE_UP
The user has activated the line up area of a scroll bar.
o SCROLL_LOCK
The Scroll Lock key, a non-ASCII action key.
o SCROLL_PAGE_DOWN
The user has activated the page down area of a scroll bar.
o SCROLL_PAGE_UP
The user has activated the page up area of a scroll bar.
o SHIFT_MASK
This flag indicates that the Shift key was down when the event occurred.
o TAB
The Tab key.
o target
The target component.
o UP
The Up Arrow key, a non-ASCII action key.
o when
The time stamp.
o WINDOW_DEICONIFY
The user has asked the window manager to de-iconify the window.
o WINDOW_DESTROY
The user has asked the window manager to kill the window.
o WINDOW_EXPOSE
The user has asked the window manager to expose the window.
o WINDOW_ICONIFY
The user has asked the window manager to iconify the window.
o WINDOW_MOVED
The user has asked the window manager to move the window.
o x
The x coordinate of the event.
o y
The y coordinate of the event.

Constructor Index

o Event(Object, int, Object)
Creates an instance of Event with the specified target component, event type, and argument.
o Event(Object, long, int, int, int, int, int)
Creates an instance of Event, with the specified target component, time stamp, event type, x and y coordinates, keyboard key, state of the modifier keys, and an argument set to null.
o Event(Object, long, int, int, int, int, int, Object)
Creates an instance of Event with the specified target component, time stamp, event type, x and y coordinates, keyboard key, state of the modifier keys, and argument.

Method Index

o controlDown()
Checks if the Control key is down.
o metaDown()
Checks if the Meta key is down.
o paramString()
Returns the parameter string representing this event.
o shiftDown()
Checks if the Shift key is down.
o toString()
Returns a representation of this event's values as a string.
o translate(int, int)
Translates this event so that its x and y coordinates are increased by dx and dy, respectively.

Variables

o SHIFT_MASK public static final int SHIFT_MASK
This flag indicates that the Shift key was down when the event occurred.

o CTRL_MASK public static final int CTRL_MASK
This flag indicates that the Control key was down when the event occurred.

o 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.

o 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.

o HOME public static final int HOME
The Home key, a non-ASCII action key.

o END public static final int END
The End key, a non-ASCII action key.

o PGUP public static final int PGUP
The Page Up key, a non-ASCII action key.

o PGDN public static final int PGDN
The Page Down key, a non-ASCII action key.

o UP public static final int UP
The Up Arrow key, a non-ASCII action key.

o DOWN public static final int DOWN
The Down Arrow key, a non-ASCII action key.

o LEFT public static final int LEFT
The Left Arrow key, a non-ASCII action key.

o RIGHT public static final int RIGHT
The Right Arrow key, a non-ASCII action key.

o F1 public static final int F1
The F1 function key, a non-ASCII action key.

o F2 public static final int F2
The F2 function key, a non-ASCII action key.

o F3 public static final int F3
The F3 function key, a non-ASCII action key.

o F4 public static final int F4
The F4 function key, a non-ASCII action key.

o F5 public static final int F5
The F5 function key, a non-ASCII action key.

o F6 public static final int F6
The F6 function key, a non-ASCII action key.

o F7 public static final int F7
The F7 function key, a non-ASCII action key.

o F8 public static final int F8
The F8 function key, a non-ASCII action key.

o F9 public static final int F9
The F9 function key, a non-ASCII action key.

o F10 public static final int F10
The F10 function key, a non-ASCII action key.

o F11 public static final int F11
The F11 function key, a non-ASCII action key.

o F12 public static final int F12
The F12 function key, a non-ASCII action key.

o PRINT_SCREEN public static final int PRINT_SCREEN
The Print Screen key, a non-ASCII action key.

o SCROLL_LOCK public static final int SCROLL_LOCK
The Scroll Lock key, a non-ASCII action key.

o CAPS_LOCK public static final int CAPS_LOCK
The Caps Lock key, a non-ASCII action key.

o NUM_LOCK public static final int NUM_LOCK
The Num Lock key, a non-ASCII action key.

o PAUSE public static final int PAUSE
The Pause key, a non-ASCII action key.

o INSERT public static final int INSERT
The Insert key, a non-ASCII action key.

o ENTER public static final int ENTER
The Enter key.

o BACK_SPACE public static final int BACK_SPACE
The BackSpace key.

o TAB public static final int TAB
The Tab key.

o ESCAPE public static final int ESCAPE
The Escape key.

o DELETE public static final int DELETE
The Delete key.

o WINDOW_DESTROY public static final int WINDOW_DESTROY
The user has asked the window manager to kill the window.

o WINDOW_EXPOSE public static final int WINDOW_EXPOSE
The user has asked the window manager to expose the window.

o WINDOW_ICONIFY public static final int WINDOW_ICONIFY
The user has asked the window manager to iconify the window.

o WINDOW_DEICONIFY public static final int WINDOW_DEICONIFY
The user has asked the window manager to de-iconify the window.

o WINDOW_MOVED public static final int WINDOW_MOVED
The user has asked the window manager to move the window.

o KEY_PRESS public static final int KEY_PRESS
The user has pressed a normal key.

o KEY_RELEASE public static final int KEY_RELEASE
The user has released a normal key.

o 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.

o 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.

o 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
o 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
o MOUSE_MOVE public static final int MOUSE_MOVE
The mouse has moved with no button pressed.

o MOUSE_ENTER public static final int MOUSE_ENTER
The mouse has entered a component.

o MOUSE_EXIT public static final int MOUSE_EXIT
The mouse has exited a component.

o 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
o SCROLL_LINE_UP public static final int SCROLL_LINE_UP
The user has activated the line up area of a scroll bar.

o SCROLL_LINE_DOWN public static final int SCROLL_LINE_DOWN
The user has activated the line down area of a scroll bar.

o SCROLL_PAGE_UP public static final int SCROLL_PAGE_UP
The user has activated the page up area of a scroll bar.

o SCROLL_PAGE_DOWN public static final int SCROLL_PAGE_DOWN
The user has activated the page down area of a scroll bar.

o 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 postion.

o SCROLL_BEGIN public static final int SCROLL_BEGIN
The scroll begin event.

o SCROLL_END public static final int SCROLL_END
The scroll end event.

o LIST_SELECT public static final int LIST_SELECT
An item in a list has been selected.

o LIST_DESELECT public static final int LIST_DESELECT
An item in a list has been deselected.

o ACTION_EVENT public static final int ACTION_EVENT
This event indicates that the user wants some action to occur.

o LOAD_FILE public static final int LOAD_FILE
A file loading event.

o SAVE_FILE public static final int SAVE_FILE
A file saving event.

o GOT_FOCUS public static final int GOT_FOCUS
A component gained the focus.

o LOST_FOCUS public static final int LOST_FOCUS
A component lost the focus.

o target public Object target
The target component. This indicates the component over which the event occurred or with which the event is associated.

o when public long when
The time stamp.

o id public int id
Indicates which type of event the event is, and which other Event variables are relevant for the event.

o x public int x
The x coordinate of the event.

o y public int y
The y coordinate of the event.

o key public int key
The key code of the key that was pressed in a keyboard event.

o modifiers public int modifiers
The state of the modifier keys.

NOTE: changing the modifier keys is not recommended, because many native implementations do not recognize modifier changes. This is especially true when the shift modifier is changed.

o clickCount public int clickCount
For MOUSE_DOWN events, this field indicates the number of consecutive clicks. For other events, its value is 0.

o arg public Object arg
An arbitrary argument of the event. The value of this field depends on the type of event.

o evt public Event evt
The next event. This field is set when putting events into a linked list.

Constructors

o Event public Event(Object target, long when, int id, int x, int y, int key, int modifiers, Object arg)
Creates an instance of Event with the specified target component, time stamp, event type, x and y coordinates, keyboard key, state of the modifier keys, and argument.

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.
o Event public Event(Object target, long when, int id, int x, int y, int key, int modifiers)
Creates an instance of Event, with the specified target component, time stamp, event type, x and y coordinates, keyboard key, state of the modifier keys, and an argument set to null.

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.
o Event public Event(Object target, int id, Object arg)
Creates an instance of Event with the specified target component, event type, and argument.

Parameters:
target - the target component.
id - the event type.
arg - the specified argument.

Methods

o translate public void translate(int x, int y)
Translates this event so that its x and y coordinates are increased by dx and dy, respectively.

This method translates an event relative to the given component. This involves, at a minimum, translating the coordinates into the local coordinate system of the given component. It may also involve translating a region in the case of an expose event.

Parameters:
dx - the distance to translate the x coordinate.
dy - the distance to translate the y coordinate.
o shiftDown public boolean shiftDown()
Checks if the Shift key is down.

Returns:
true if the key is down; false otherwise.
See Also:
modifiers, controlDown, metaDown
o controlDown public boolean controlDown()
Checks if the Control key is down.

Returns:
true if the key is down; false otherwise.
See Also:
modifiers, shiftDown, metaDown
o metaDown public boolean metaDown()
Checks if the Meta key is down.

Returns:
true if the key is down; false otherwise.
See Also:
modifiers, shiftDown, controlDown
o paramString protected String paramString()
Returns the parameter string representing this event. This string is useful for debugging.

Returns:
the parameter string of this event.
o toString public String toString()
Returns a representation of this event's values as a string.

Returns:
a string that represents the event and the values of its member fields.
Overrides:
toString in class Object
See Also:
paramString
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