java.awt.AWTKeyStroke
javax.swing.KeyStroke
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Java™ Platform Standard Ed. 6 |
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java.lang.Object
public class KeyStroke
A KeyStroke represents a key action on the keyboard, or equivalent input device. KeyStrokes 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, KeyStrokes can specify modifiers (alt, shift, control, meta, altGraph, or a combination thereof) which must be present during the action for an exact match.
KeyStrokes are used to define high-level (semantic) action events. Instead of trapping every keystroke and throwing away the ones you are not interested in, those keystrokes you care about automatically initiate actions on the Components with which they are registered.
KeyStrokes are immutable, and are intended to be unique. Client code cannot
create a KeyStroke; a variant of getKeyStroke must be used
instead. These factory methods allow the KeyStroke implementation to cache
and share instances efficiently.
Warning:
Serialized objects of this class will not be compatible with
future Swing releases. The current serialization support is
appropriate for short term storage or RMI between applications running
the same version of Swing. As of 1.4, support for long term storage
of all JavaBeansTM
has been added to the java.beans package.
Please see XMLEncoder.
Keymap,
getKeyStroke(char)| Method Summary | |
|---|---|
static KeyStroke |
getKeyStroke(char keyChar)
Returns a shared instance of a KeyStroke
that represents a KEY_TYPED event for the
specified character. |
static KeyStroke |
getKeyStroke(Character keyChar,
int modifiers)
Returns a shared instance of a KeyStroke
that represents a KEY_TYPED event for the
specified Character object and a
set of modifiers. |
static KeyStroke |
getKeyStroke(char keyChar,
boolean onKeyRelease)
Deprecated. use getKeyStroke(char) |
static KeyStroke |
getKeyStroke(int keyCode,
int modifiers)
Returns a shared instance of a KeyStroke, given a numeric key code and a set of modifiers. |
static KeyStroke |
getKeyStroke(int keyCode,
int modifiers,
boolean onKeyRelease)
Returns a shared instance of a KeyStroke, given a numeric key code and a set of modifiers, specifying whether the key is activated when it is pressed or released. |
static KeyStroke |
getKeyStroke(String s)
Parses a string and returns a KeyStroke. |
static KeyStroke |
getKeyStrokeForEvent(KeyEvent anEvent)
Returns a KeyStroke which represents the stroke which generated a given KeyEvent. |
| Methods inherited from class java.awt.AWTKeyStroke |
|---|
equals, getAWTKeyStroke, getAWTKeyStroke, getAWTKeyStroke, getAWTKeyStroke, getAWTKeyStroke, getAWTKeyStrokeForEvent, getKeyChar, getKeyCode, getKeyEventType, getModifiers, hashCode, isOnKeyRelease, readResolve, registerSubclass, toString |
| Methods inherited from class java.lang.Object |
|---|
clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
| Method Detail |
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public static KeyStroke getKeyStroke(char keyChar)
KeyStroke
that represents a KEY_TYPED event for the
specified character.
keyChar - the character value for a keyboard key
@Deprecated
public static KeyStroke getKeyStroke(char keyChar,
boolean onKeyRelease)
keyChar - the character value for a keyboard keyonKeyRelease - true if this KeyStroke corresponds to a
key release; false otherwise.
public static KeyStroke getKeyStroke(Character keyChar,
int modifiers)
KeyStroke
that represents a 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
getKeyStroke(int keyCode, int modifiers).
The modifiers consist of any combination of following:
keyChar - the Character object for a keyboard charactermodifiers - a bitwise-ored combination of any modifiers
IllegalArgumentException - if keyChar is nullInputEvent
public static KeyStroke getKeyStroke(int keyCode,
int modifiers,
boolean onKeyRelease)
The "virtual key" constants defined in java.awt.event.KeyEvent can be used to specify the key code. For example:
keyCode - an int specifying the numeric code for a keyboard keymodifiers - a bitwise-ored combination of any modifiersonKeyRelease - true if the KeyStroke should represent
a key release; false otherwise.
KeyEvent,
InputEvent
public static KeyStroke getKeyStroke(int keyCode,
int modifiers)
The "virtual key" constants defined in java.awt.event.KeyEvent can be used to specify the key code. For example:
keyCode - an int specifying the numeric code for a keyboard keymodifiers - a bitwise-ored combination of any modifiers
KeyEvent,
InputEventpublic static KeyStroke getKeyStrokeForEvent(KeyEvent anEvent)
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.
anEvent - the KeyEvent from which to obtain the KeyStroke
NullPointerException - if anEvent is nullpublic static KeyStroke getKeyStroke(String s)
KeyStroke.
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" => getKeyStroke(KeyEvent.VK_INSERT, 0);
"control DELETE" => getKeyStroke(KeyEvent.VK_DELETE, InputEvent.CTRL_MASK);
"alt shift X" => getKeyStroke(KeyEvent.VK_X, InputEvent.ALT_MASK | InputEvent.SHIFT_MASK);
"alt shift released X" => getKeyStroke(KeyEvent.VK_X, InputEvent.ALT_MASK | InputEvent.SHIFT_MASK, true);
"typed a" => getKeyStroke('a');
In order to maintain backward-compatibility, specifying a null String,
or a String which is formatted incorrectly, returns null.
s - a String formatted as described above
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Java™ Platform Standard Ed. 6 |
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