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Copyright © 2006 Sun Microsystems, Inc. All rights reserved.
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JSR 217 (Maintenance Release)
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java.awt
Class AWTKeyStroke

java.lang.Object
  extended byjava.awt.AWTKeyStroke
All Implemented Interfaces:
Serializable
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, 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.

Since:
1.4
See Also:
getAWTKeyStroke(char), Serialized Form

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

Method Detail

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 AWTKeyStroke, given a 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: 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:
keyChar - the Character object for a keyboard character
modifiers - a bitwise-ored combination of any modifiers
Returns:
an AWTKeyStroke object for that key
Throws:
IllegalArgumentException - if keyChar is null
See Also:
InputEvent

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
See Also:
KeyEvent, InputEvent

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
See Also:
KeyEvent, InputEvent

getAWTKeyStrokeForEvent

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

This method obtains the key char from a KeyTyped event, and the key code 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

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 | button1 | button2 | button3
    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
Throws:
IllegalArgumentException - if s is null, or is formatted incorrectly

getKeyChar

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

Returns:
a char value
See Also:
getAWTKeyStroke(char)

getKeyCode

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

Returns:
an int containing the key code value
See Also:
getAWTKeyStroke(int,int)

getModifiers

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

Returns:
an int containing the modifiers
See Also:
getAWTKeyStroke(int,int)

isOnKeyRelease

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

Returns:
true if this AWTKeyStroke represents a key release; false otherwise
See Also:
getAWTKeyStroke(int,int,boolean)

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
See Also:
KeyEvent

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
See Also:
Object.equals(java.lang.Object), Hashtable

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
See Also:
Object.hashCode(), Hashtable

toString

public String toString()
Returns a string that displays and identifies this object's properties.

Overrides:
toString in class Object
Returns:
a String representation of this object
Overview  Package   Class  Use  Tree  Deprecated  Index  Help 
JSR 217 (Maintenance Release)
 PREV CLASS   NEXT CLASS FRAMES    NO FRAMES    
SUMMARY: NESTED | FIELD | CONSTR | METHOD DETAIL: FIELD | CONSTR | METHOD
Copyright © 2006 Sun Microsystems, Inc. All rights reserved. Use is subject to License Terms. Your use of this web site or any of its content or software indicates your agreement to be bound by these License Terms.

For more information, please consult the JSR 217 specification. ing HTML reloca