JDK8/Java8源码在线阅读
/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package javax.swing;
import java.awt.AWTKeyStroke;
import java.awt.event.KeyEvent;
/**
* 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.
* <p>
* 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.
* <p>
* KeyStrokes are immutable, and are intended to be unique. Client code cannot
* create a KeyStroke; a variant of <code>getKeyStroke</code> must be used
* instead. These factory methods allow the KeyStroke implementation to cache
* and share instances efficiently.
* <p>
* <strong>Warning:</strong>
* 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 JavaBeans™
* has been added to the <code>java.beans</code> package.
* Please see {@link java.beans.XMLEncoder}.
*
* @see javax.swing.text.Keymap
* @see #getKeyStroke
*
* @author Arnaud Weber
* @author David Mendenhall
*/
public class KeyStroke extends AWTKeyStroke {
/**
* Serial Version ID.
*/
private static final long serialVersionUID = -9060180771037902530L;
private KeyStroke() {
}
private KeyStroke(char keyChar, int keyCode, int modifiers,
boolean onKeyRelease) {
super(keyChar, keyCode, modifiers, onKeyRelease);
}
/**
* Returns a shared instance of a <code>KeyStroke</code>
* that represents a <code>KEY_TYPED</code> event for the
* specified character.
*
* @param keyChar the character value for a keyboard key
* @return a KeyStroke object for that key
*/
public static KeyStroke getKeyStroke(char keyChar) {
synchronized (AWTKeyStroke.class) {
registerSubclass(KeyStroke.class);
return (KeyStroke)getAWTKeyStroke(keyChar);
}
}
/**
* Returns an instance of a KeyStroke, specifying whether the key is
* considered to be activated when it is pressed or released. Unlike all
* other factory methods in this class, the instances returned by this
* method are not necessarily cached or shared.
*
* @param keyChar the character value for a keyboard key
* @param onKeyRelease <code>true</code> if this KeyStroke corresponds to a
* key release; <code>false</code> otherwise.
* @return a KeyStroke object for that key
* @deprecated use getKeyStroke(char)
*/
@Deprecated
public static KeyStroke getKeyStroke(char keyChar, boolean onKeyRelease) {
return new KeyStroke(keyChar, KeyEvent.VK_UNDEFINED, 0, onKeyRelease);
}
/**
* Returns a shared instance of a {@code KeyStroke}
* 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
* <code>getKeyStroke(int keyCode, int modifiers)</code>.
*
* The modifiers consist of any combination of following:<ul>
* <li>java.awt.event.InputEvent.SHIFT_DOWN_MASK
* <li>java.awt.event.InputEvent.CTRL_DOWN_MASK
* <li>java.awt.event.InputEvent.META_DOWN_MASK
* <li>java.awt.event.InputEvent.ALT_DOWN_MASK
* <li>java.awt.event.InputEvent.ALT_GRAPH_DOWN_MASK
* </ul>
* The old modifiers listed below also can be used, but they are
* mapped to _DOWN_ modifiers. <ul>
* <li>java.awt.event.InputEvent.SHIFT_MASK
* <li>java.awt.event.InputEvent.CTRL_MASK
* <li>java.awt.event.InputEvent.META_MASK
* <li>java.awt.event.InputEvent.ALT_MASK
* <li>java.awt.event.InputEvent.ALT_GRAPH_MASK
* </ul>
* 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.
*
* @param keyChar the Character object for a keyboard character
* @param modifiers a bitwise-ored combination of any modifiers
* @return an KeyStroke object for that key
* @throws IllegalArgumentException if keyChar is null
*
* @see java.awt.event.InputEvent
* @since 1.3
*/
public static KeyStroke getKeyStroke(Character keyChar, int modifiers) {
synchronized (AWTKeyStroke.class) {
registerSubclass(KeyStroke.class);
return (KeyStroke)getAWTKeyStroke(keyChar, modifiers);
}
}
/**
* 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.
* <p>
* The "virtual key" constants defined in java.awt.event.KeyEvent can be
* used to specify the key code. For example:<ul>
* <li>java.awt.event.KeyEvent.VK_ENTER
* <li>java.awt.event.KeyEvent.VK_TAB
* <li>java.awt.event.KeyEvent.VK_SPACE
* </ul>
* Alternatively, the key code may be obtained by calling
* <code>java.awt.event.KeyEvent.getExtendedKeyCodeForChar</code>.
*
* The modifiers consist of any combination of:<ul>
* <li>java.awt.event.InputEvent.SHIFT_DOWN_MASK
* <li>java.awt.event.InputEvent.CTRL_DOWN_MASK
* <li>java.awt.event.InputEvent.META_DOWN_MASK
* <li>java.awt.event.InputEvent.ALT_DOWN_MASK
* <li>java.awt.event.InputEvent.ALT_GRAPH_DOWN_MASK
* </ul>
* The old modifiers <ul>
* <li>java.awt.event.InputEvent.SHIFT_MASK
* <li>java.awt.event.InputEvent.CTRL_MASK
* <li>java.awt.event.InputEvent.META_MASK
* <li>java.awt.event.InputEvent.ALT_MASK
* <li>java.awt.event.InputEvent.ALT_GRAPH_MASK
* </ul>
* 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.
*
* @param keyCode an int specifying the numeric code for a keyboard key
* @param modifiers a bitwise-ored combination of any modifiers
* @param onKeyRelease <code>true</code> if the KeyStroke should represent
* a key release; <code>false</code> otherwise.
* @return a KeyStroke object for that key
*
* @see java.awt.event.KeyEvent
* @see java.awt.event.InputEvent
*/
public static KeyStroke getKeyStroke(int keyCode, int modifiers,
boolean onKeyRelease) {
synchronized (AWTKeyStroke.class) {
registerSubclass(KeyStroke.class);
return (KeyStroke)getAWTKeyStroke(keyCode, modifiers,
onKeyRelease);
}
}
/**
* Returns a shared instance of a KeyStroke, given a numeric key code and a
* set of modifiers. The returned KeyStroke will correspond to a key press.
* <p>
* The "virtual key" constants defined in java.awt.event.KeyEvent can be
* used to specify the key code. For example:<ul>
* <li>java.awt.event.KeyEvent.VK_ENTER
* <li>java.awt.event.KeyEvent.VK_TAB
* <li>java.awt.event.KeyEvent.VK_SPACE
* </ul>
* Alternatively, the key code may be obtained by calling
* <code>java.awt.event.KeyEvent.getExtendedKeyCodeForChar</code>.
*
* The modifiers consist of any combination of:<ul>
* <li>java.awt.event.InputEvent.SHIFT_DOWN_MASK
* <li>java.awt.event.InputEvent.CTRL_DOWN_MASK
* <li>java.awt.event.InputEvent.META_DOWN_MASK
* <li>java.awt.event.InputEvent.ALT_DOWN_MASK
* <li>java.awt.event.InputEvent.ALT_GRAPH_DOWN_MASK
* </ul>
* The old modifiers <ul>
* <li>java.awt.event.InputEvent.SHIFT_MASK
* <li>java.awt.event.InputEvent.CTRL_MASK
* <li>java.awt.event.InputEvent.META_MASK
* <li>java.awt.event.InputEvent.ALT_MASK
* <li>java.awt.event.InputEvent.ALT_GRAPH_MASK
* </ul>
* 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.
*
* @param keyCode an int specifying the numeric code for a keyboard key
* @param modifiers a bitwise-ored combination of any modifiers
* @return a KeyStroke object for that key
*
* @see java.awt.event.KeyEvent
* @see java.awt.event.InputEvent
*/
public static KeyStroke getKeyStroke(int keyCode, int modifiers) {
synchronized (AWTKeyStroke.class) {
registerSubclass(KeyStroke.class);
return (KeyStroke)getAWTKeyStroke(keyCode, modifiers);
}
}
/**
* Returns a KeyStroke which represents the stroke which generated a given
* KeyEvent.
* <p>
* 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.
*
* @param anEvent the KeyEvent from which to obtain the KeyStroke
* @throws NullPointerException if <code>anEvent</code> is null
* @return the KeyStroke that precipitated the event
*/
public static KeyStroke getKeyStrokeForEvent(KeyEvent anEvent) {
synchronized (AWTKeyStroke.class) {
registerSubclass(KeyStroke.class);
return (KeyStroke)getAWTKeyStrokeForEvent(anEvent);
}
}
/**
* Parses a string and returns a <code>KeyStroke</code>.
* The string must have the following syntax:
* <pre>
* <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_".
* </pre>
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