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Wednesday 17 September 2014

Java Awt Quick Guide 5

AWT AWTEvent Class

It is the root event class for all AWT events. This class and its subclasses supercede the original java.awt.Event class. This class is defined in java.awt package. This class has a method named getID() that can be used to determine the type of event.

Class declaration

Following is the declaration for java.awt.AWTEvent class:
public class AWTEvent
   extends EventObject

Field

Following are the fields for java.awt.AWTEvent class:
  • static int ACTION_FIRST -- The first number in the range of ids used for action events.
  • static long ACTION_EVENT_MASK -- The event mask for selecting action events.
  • static long ADJUSTMENT_EVENT_MASK -- The event mask for selecting adjustment events.
  • static long COMPONENT_EVENT_MASK -- The event mask for selecting component events.
  • protected boolean consumed -- Controls whether or not the event is sent back down to the peer once the source has processed it - false means it's sent to the peer; true means it's not.
  • static long CONTAINER_EVENT_MASK -- The event mask for selecting container events.
  • static long FOCUS_EVENT_MASK -- The event mask for selecting focus events.
  • static long HIERARCHY_BOUNDS_EVENT_MASK -- The event mask for selecting hierarchy bounds events.
  • static long HIERARCHY_EVENT_MASK -- The event mask for selecting hierarchy events.
  • protected int id -- The event's id.
  • static long INPUT_METHOD_EVENT_MASK -- The event mask for selecting input method events.
  • static long INVOCATION_EVENT_MASK -- The event mask for selecting invocation events.
  • static long ITEM_EVENT_MASK -- The event mask for selecting item events.
  • static long KEY_EVENT_MASK -- The event mask for selecting key events.
  • static long MOUSE_EVENT_MASK -- The event mask for selecting mouse events.
  • static long MOUSE_MOTION_EVENT_MASK -- The event mask for selecting mouse motion events.
  • static long MOUSE_WHEEL_EVENT_MASK -- The event mask for selecting mouse wheel events.
  • static long PAINT_EVENT_MASK -- The event mask for selecting paint events.
  • static int RESERVED_ID_MAX -- The maximum value for reserved AWT event IDs.
  • static long TEXT_EVENT_MASK -- The event mask for selecting text events.
  • static long WINDOW_EVENT_MASK -- The event mask for selecting window events.
  • static long WINDOW_FOCUS_EVENT_MASK -- The event mask for selecting window focus events.
  • static long WINDOW_STATE_EVENT_MASK -- The event mask for selecting window state events.

Class constructors

S.N.Constructor & Description
1AWTEvent(Event event)
Constructs an AWTEvent object from the parameters of a 1.0-style event.
2AWTEvent(java.lang.Object source, int id)
Constructs an AWTEvent object with the specified source object and type.

Class methods

S.N.Method & Description
1protected void consume()
Consumes this event, if this event can be consumed.
2int getID()
Returns the event type.
3protected boolean isConsumed()
Returns whether this event has been consumed.
4java.lang.String paramString()
Returns a string representing the state of this Event.
5void setSource(java.lang.Object newSource)
Retargets an event to a new source.
6java.lang.String toString()
Returns a String representation of this object.

Methods inherited

This class inherits methods from the following classes:
  • java.util.EventObject
  • java.lang.Object

AWT ActionEvent Class

This class is defined in java.awt.event package. The ActionEvent is generated when button is clicked or the item of a list is double clicked.

Class declaration

Following is the declaration for java.awt.event.ActionEvent class:
public class ActionEvent
   extends AWTEvent

Field

Following are the fields for java.awt.event.ActionEvent class:
  • static int ACTION_FIRST -- The first number in the range of ids used for action events.
  • static int ACTION_LAST -- The last number in the range of ids used for action events.
  • static int ACTION_PERFORMED -- This event id indicates that a meaningful action occured.
  • static int ALT_MASK -- The alt modifier.
  • static int CTRL_MASK -- The control modifier.
  • static int META_MASK -- The meta modifier.
  • static int SHIFT_MASK -- The shift modifier.

Class constructors

S.N.Constructor & Description
1ActionEvent(java.lang.Object source, int id, java.lang.String command)
Constructs an ActionEvent object.
2ActionEvent(java.lang.Object source, int id, java.lang.String command, int modifiers)
Constructs an ActionEvent object with modifier keys.
3ActionEvent(java.lang.Object source, int id, java.lang.String command, long when, int modifiers)
Constructs an ActionEvent object with the specified modifier keys and timestamp.

Class methods

S.N.Method & Description
1java.lang.String getActionCommand()
Returns the command string associated with this action.
2int getModifiers()
Returns the modifier keys held down during this action event.
3long getWhen()
Returns the timestamp of when this event occurred.
4java.lang.String paramString()
Returns a parameter string identifying this action event.

Methods inherited

This class inherits methods from the following classes:
  • java.awt.AWTEvent
  • java.util.EventObject
  • java.lang.Object

AWT InputEvent Class

The InputEvent class is root event class for all component-level input events. Input events are delivered to listeners before they are processed normally by the source where they originated. This allows listeners and component subclasses to "consume" the event so that the source will not process them in their default manner. For example, consuming mousePressed events on a Button component will prevent the Button from being activated.

Class declaration

Following is the declaration for java.awt.event.InputEvent class:
public abstract class InputEvent
   extends ComponentEvent

Field

Following are the fields for java.awt.event.InputEvent class:
  • static int ALT_DOWN_MASK -- The Alt key extended modifier constant.
  • static int ALT_GRAPH_DOWN_MASK -- The AltGraph key extended modifier constant.
  • static int ALT_GRAPH_MASK -- The AltGraph key modifier constant.
  • static int ALT_MASK -- The Alt key modifier constant.
  • static int BUTTON1_DOWN_MASK -- The Mouse Button1 extended modifier constant.
  • static int BUTTON1_MASK -- The Mouse Button1 modifier constant.
  • static int BUTTON2_DOWN_MASK -- The Mouse Button2 extended modifier constant.
  • static int BUTTON2_MASK -- The Mouse Button2 modifier constant.
  • static int BUTTON3_DOWN_MASK -- The Mouse Button3 extended modifier constant.
  • static int BUTTON3_MASK --The Mouse Button3 modifier constant.
  • static int CTRL_DOWN_MASK -- The Control key extended modifier constant.
  • static int CTRL_MASK -- The Control key modifier constant.
  • static int META_DOWN_MASK -- The Meta key extended modifier constant.
  • static int META_MASK -- The Meta key modifier constant.
  • static int SHIFT_DOWN_MASK -- The Shift key extended modifier constant.
  • static int SHIFT_MASK -- The Shift key modifier constant.

Class methods

S.N.Method & Description
1void consume()
Consumes this event so that it will not be processed in the default manner by the source which originated it.
2int getModifiers()
Returns the modifier mask for this event.
3int getModifiersEx()
Returns the extended modifier mask for this event.
4static String getModifiersExText(int modifiers)
Returns a String describing the extended modifier keys and mouse buttons, such as "Shift", "Button1", or "Ctrl+Shift".
5long getWhen()
Returns the timestamp of when this event occurred.
6boolean isAltDown()
Returns whether or not the Alt modifier is down on this event.
7boolean isAltGraphDown()
Returns whether or not the AltGraph modifier is down on this event.
8boolean isConsumed()
Returns whether or not this event has been consumed.
9boolean isControlDown()
Returns whether or not the Control modifier is down on this event.
10boolean isMetaDown()
Returns whether or not the Meta modifier is down on this event.
11boolean isShiftDown()
Returns whether or not the Shift modifier is down on this event.

Methods inherited

This class inherits methods from the following classes:
  • java.awt.event.ComponentEvent
  • java.awt.AWTEvent
  • java.util.EventObject
  • java.lang.Object

AWT KeyEvent Class

On entering the character the Key event is generated.There are three types of key events which are represented by the integer constants. These key events are following
  • KEY_PRESSED
  • KEY_RELASED
  • KEY_TYPED

Class declaration

Following is the declaration for java.awt.event.KeyEvent class:
public class KeyEvent
   extends InputEvent

Field

Following are the fields for java.awt.InputEvent class:
  • 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_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.
    • 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 --Constant for the back slash key, "\"
  • static int VK_BACK_SPACE
  • static int VK_BEGIN --Constant for the Begin key.
  • 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 --Constant for the close bracket key, "]"
  • static int VK_CODE_INPUT --Constant for the Code Input function key.
  • static int VK_COLON --Constant for the ":" key.
  • static int VK_COMMA --Constant for the comma key, ","
  • static int VK_COMPOSE --Constant for the Compose function key.
  • static int VK_CONTEXT_MENU --Constant for the Microsoft Windows Context Menu 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 --Constant for the equals key, "="
  • 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_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 minus 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 --Constant for the open bracket key, "["
  • 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 --Constant for the period key, "."
  • 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 -- Constant for the semicolon key, ";"
  • 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 -- Constant for the forward slash key, "/"
  • 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_WINDOWS --Constant for the Microsoft Windows "Windows" key.
  • static int VK_X
  • static int VK_Y
  • static int VK_Z

Class constructors

S.N.Constructor & Description
1KeyEvent(Component source, int id, long when, int modifiers, int keyCode)
Deprecated. as of JDK1.1
2KeyEvent(Component source, int id, long when, int modifiers, int keyCode, char keyChar)
Constructs a KeyEvent object.
3KeyEvent(Component source, int id, long when, int modifiers, int keyCode, char keyChar, int keyLocation)

Class methods

S.N.Method & Description
1char getKeyChar()
Returns the character associated with the key in this event.
2int getKeyCode()
Returns the integer keyCode associated with the key in this event.
3int getKeyLocation()
Returns the location of the key that originated this key event.
4static String getKeyModifiersText(int modifiers)
Returns a String describing the modifier key(s), such as "Shift", or "Ctrl+Shift".
5static String getKeyText(int keyCode)
Returns a String describing the keyCode, such as "HOME", "F1" or "A".
6boolean isActionKey()
Returns whether the key in this event is an "action" key.
7String paramString()
Returns a parameter string identifying this event.
8void setKeyChar(char keyChar)
Set the keyChar value to indicate a logical character.
9void setKeyCode(int keyCode)
Set the keyCode value to indicate a physical key.
10void setModifiers(int modifiers)
Deprecated. as of JDK1.1.4

Methods inherited

This class inherits methods from the following classes:
  • java.awt.event.InputEvent
  • java.awt.event.ComponentEvent
  • java.awt.AWTEvent
  • java.util.EventObject
  • java.lang.Object
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