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java.awt
class AWTKeyStroke

java.lang.Object extended by java.awt.AWTKeyStroke
All Implemented Interfaces:
Serializable
Direct Known Subclasses:
KeyStroke
public class AWTKeyStroke
extends Object
implements Serializable

An AWTKeyStroke represents a key action on the keyboard, or equivalent input device. AWTKeyStrokes can correspond to only a press or release of a particular key, just as KEY_PRESSED and KEY_RELEASED KeyEvents do; alternately, they can correspond to typing a specific Java character, just as KEY_TYPED KeyEvents do. In all cases, AWTKeyStrokes can specify modifiers (alt, shift, control, meta, altGraph, or a combination thereof) which must be present during the action for an exact match.

AWTKeyStrokes are immutable, and are intended to be unique. Client code should never create an AWTKeyStroke on its own, but should instead use a variant of getAWTKeyStroke. Client use of these factory methods allows the AWTKeyStroke implementation to cache and share instances efficiently.

Constructor Summary
protected
AWTKeyStroke()

          Constructs an AWTKeyStroke with default values.
protected
AWTKeyStroke(char keyChar, int keyCode, int modifiers, boolean onKeyRelease)

          Constructs an AWTKeyStroke with the specified values.
 
Method Summary
 boolean
equals(Object anObject)

          Returns true if this object is identical to the specified object.
static AWTKeyStroke
getAWTKeyStroke(char keyChar)

          Returns a shared instance of an AWTKeyStroke that represents a KEY_TYPED event for the specified character.
static AWTKeyStroke
getAWTKeyStroke(Character keyChar, int modifiers)

          Returns a shared instance of an that represents a event for the specified Character object and a set of modifiers.
static AWTKeyStroke
getAWTKeyStroke(int keyCode, int modifiers)

          Returns a shared instance of an AWTKeyStroke, given a numeric key code and a set of modifiers.
static AWTKeyStroke
getAWTKeyStroke(int keyCode, int modifiers, boolean onKeyRelease)

          Returns a shared instance of an AWTKeyStroke, given a numeric key code and a set of modifiers, specifying whether the key is activated when it is pressed or released.
static AWTKeyStroke
getAWTKeyStroke(String s)

          Parses a string and returns an AWTKeyStroke.
static AWTKeyStroke
getAWTKeyStrokeForEvent(KeyEvent anEvent)

          Returns an AWTKeyStroke which represents the stroke which generated a given KeyEvent.
 char
getKeyChar()

          Returns the character for this AWTKeyStroke.
 int
getKeyCode()

          Returns the numeric key code for this AWTKeyStroke.
 int
getKeyEventType()

          Returns the type of KeyEvent which corresponds to this AWTKeyStroke.
 int
getModifiers()

          Returns the modifier keys for this AWTKeyStroke.
 int
hashCode()

          Returns a numeric value for this object that is likely to be unique, making it a good choice as the index value in a hash table.
 boolean
isOnKeyRelease()

          Returns whether this AWTKeyStroke represents a key release.
protected Object
readResolve()

          Returns a cached instance of AWTKeyStroke (or a subclass of AWTKeyStroke) which is equal to this instance.
protected static void
registerSubclass(Class subclass)

          Registers a new class which the factory methods in AWTKeyStroke will use when generating new instances of AWTKeyStrokes.
 String
toString()

          Returns a string that displays and identifies this object's properties.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

AWTKeyStroke

protected AWTKeyStroke()
Constructs an AWTKeyStroke with default values. The default values used are:
PropertyDefault Value
Key Char KeyEvent.CHAR_UNDEFINED
Key Code KeyEvent.VK_UNDEFINED
Modifiers none
On key release? false
AWTKeyStrokes should not be constructed by client code. Use a variant of getAWTKeyStroke instead.

AWTKeyStroke

protected AWTKeyStroke(char keyChar,
                       int keyCode,
                       int modifiers,
                       boolean onKeyRelease)
Constructs an AWTKeyStroke with the specified values. AWTKeyStrokes should not be constructed by client code. Use a variant of getAWTKeyStroke instead.

Parameters:
keyChar - the character value for a keyboard key
keyCode - the key code for this AWTKeyStroke
modifiers - a bitwise-ored combination of any modifiers
onKeyRelease - true if this AWTKeyStroke corresponds to a key release; false otherwise
Method Detail

equals

public final boolean equals(Object anObject)
Returns true if this object is identical to the specified object.

Overrides:
equals in class Object
Parameters:
anObject - the Object to compare this object to
Returns:
true if the objects are identical

getAWTKeyStroke

public static AWTKeyStroke getAWTKeyStroke(char keyChar)
Returns a shared instance of an AWTKeyStroke that represents a KEY_TYPED event for the specified character.

Parameters:
keyChar - the character value for a keyboard key
Returns:
an AWTKeyStroke object for that key

getAWTKeyStroke

public static AWTKeyStroke getAWTKeyStroke(Character keyChar,
                                           int modifiers)
Returns a shared instance of an {@code AWTKeyStroke} that represents a {@code KEY_TYPED} event for the specified Character object and a set of modifiers. Note that the first parameter is of type Character rather than char. This is to avoid inadvertent clashes with calls to getAWTKeyStroke(int keyCode, int modifiers). The modifiers consist of any combination of following: The old modifiers listed below also can be used, but they are mapped to _DOWN_ modifiers. also can be used, but they are mapped to _DOWN_ modifiers. Since these numbers are all different powers of two, any combination of them is an integer in which each bit represents a different modifier key. Use 0 to specify no modifiers.

Parameters:
keyChar - the Character object for a keyboard character
modifiers - a bitwise-ored combination of any modifiers
Returns:
an AWTKeyStroke object for that key

getAWTKeyStroke

public static AWTKeyStroke getAWTKeyStroke(int keyCode,
                                           int modifiers)
Returns a shared instance of an AWTKeyStroke, given a numeric key code and a set of modifiers. The returned AWTKeyStroke will correspond to a key press.

The "virtual key" constants defined in java.awt.event.KeyEvent can be used to specify the key code. For example:

The modifiers consist of any combination of: The old modifiers also can be used, but they are mapped to _DOWN_ modifiers. Since these numbers are all different powers of two, any combination of them is an integer in which each bit represents a different modifier key. Use 0 to specify no modifiers.

Parameters:
keyCode - an int specifying the numeric code for a keyboard key
modifiers - a bitwise-ored combination of any modifiers
Returns:
an AWTKeyStroke object for that key

getAWTKeyStroke

public static AWTKeyStroke getAWTKeyStroke(int keyCode,
                                           int modifiers,
                                           boolean onKeyRelease)
Returns a shared instance of an AWTKeyStroke, given a numeric key code and a set of modifiers, specifying whether the key is activated when it is pressed or released.

The "virtual key" constants defined in java.awt.event.KeyEvent can be used to specify the key code. For example:

The modifiers consist of any combination of: The old modifiers also can be used, but they are mapped to _DOWN_ modifiers. Since these numbers are all different powers of two, any combination of them is an integer in which each bit represents a different modifier key. Use 0 to specify no modifiers.

Parameters:
keyCode - an int specifying the numeric code for a keyboard key
modifiers - a bitwise-ored combination of any modifiers
onKeyRelease - true if the AWTKeyStroke should represent a key release; false otherwise
Returns:
an AWTKeyStroke object for that key

getAWTKeyStroke

public static AWTKeyStroke getAWTKeyStroke(String s)
Parses a string and returns an AWTKeyStroke. The string must have the following syntax: 
    <modifiers>* (<typedID> | <pressedReleasedID>)

    modifiers := shift | control | ctrl | meta | alt | altGraph 
    typedID := typed <typedKey>
    typedKey := string of length 1 giving Unicode character.
    pressedReleasedID := (pressed | released) key
    key := KeyEvent key code name, i.e. the name following "VK_".
If typed, pressed or released is not specified, pressed is assumed. Here are some examples: 
     "INSERT" => getAWTKeyStroke(KeyEvent.VK_INSERT, 0);
     "control DELETE" => getAWTKeyStroke(KeyEvent.VK_DELETE, InputEvent.CTRL_MASK);
     "alt shift X" => getAWTKeyStroke(KeyEvent.VK_X, InputEvent.ALT_MASK | InputEvent.SHIFT_MASK);
     "alt shift released X" => getAWTKeyStroke(KeyEvent.VK_X, InputEvent.ALT_MASK | InputEvent.SHIFT_MASK, true);
     "typed a" => getAWTKeyStroke('a');

Parameters:
s - a String formatted as described above
Returns:
an AWTKeyStroke object for that String

getAWTKeyStrokeForEvent

public static AWTKeyStroke getAWTKeyStrokeForEvent(KeyEvent anEvent)
Returns an AWTKeyStroke which represents the stroke which generated a given KeyEvent.

This method obtains the keyChar from a KeyTyped event, and the keyCode from a KeyPressed or KeyReleased event. The KeyEvent modifiers are obtained for all three types of KeyEvent.

Parameters:
anEvent - the KeyEvent from which to obtain the AWTKeyStroke
Returns:
the AWTKeyStroke that precipitated the event

getKeyChar

public final char getKeyChar()
Returns the character for this AWTKeyStroke.

Returns:
a char value

getKeyCode

public final int getKeyCode()
Returns the numeric key code for this AWTKeyStroke.

Returns:
an int containing the key code value

getKeyEventType

public final int getKeyEventType()
Returns the type of KeyEvent which corresponds to this AWTKeyStroke.

Returns:
KeyEvent.KEY_PRESSED, KeyEvent.KEY_TYPED, or KeyEvent.KEY_RELEASED

getModifiers

public final int getModifiers()
Returns the modifier keys for this AWTKeyStroke.

Returns:
an int containing the modifiers

hashCode

public int hashCode()
Returns a numeric value for this object that is likely to be unique, making it a good choice as the index value in a hash table.

Overrides:
hashCode in class Object
Returns:
an int that represents this object

isOnKeyRelease

public final boolean isOnKeyRelease()
Returns whether this AWTKeyStroke represents a key release.

Returns:
true if this AWTKeyStroke represents a key release; false otherwise

readResolve

protected Object readResolve()
                      throws ObjectStreamException
Returns a cached instance of AWTKeyStroke (or a subclass of AWTKeyStroke) which is equal to this instance.

Returns:
a cached instance which is equal to this instance
Throws:
ObjectStreamException

registerSubclass

protected static void registerSubclass(Class subclass)
Registers a new class which the factory methods in AWTKeyStroke will use when generating new instances of AWTKeyStrokes. After invoking this method, the factory methods will return instances of the specified Class. The specified Class must be either AWTKeyStroke or derived from AWTKeyStroke, and it must have a no-arg constructor. The constructor can be of any accessibility, including private. This operation flushes the current AWTKeyStroke cache.

Parameters:
subclass - the new Class of which the factory methods should create instances

toString

public String toString()
Returns a string that displays and identifies this object's properties. The String returned by this method can be passed as a parameter to getAWTKeyStroke(String) to produce a key stroke equal to this key stroke.

Overrides:
toString in class Object
Returns:
a String representation of this object
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This documentation differs from the official API. Jadeite adds extra features to the API including: variable font sizes, constructions examples, placeholders for classes and methods, and auto-generated “See Also” links. Additionally it is missing some items found in standard Javadoc documentation, including: generics type information, “Deprecated” tags and comments, “See Also” links, along with other minor differences. Please send any questions or feedback to bam@cs.cmu.edu.
This page displays the Jadeite version of the documention, which is derived from the offical documentation that contains this copyright notice:
Copyright 2008 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.
The official Sun™ documentation can be found here at http://java.sun.com/javase/6/docs/api/.