JDK14/Java14源码在线阅读
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* accompanied this code).
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package javax.swing;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.beans.*;
import javax.swing.event.*;
import sun.awt.EmbeddedFrame;
/**
* The KeyboardManager class is used to help dispatch keyboard actions for the
* WHEN_IN_FOCUSED_WINDOW style actions. Actions with other conditions are handled
* directly in JComponent.
*
* Here's a description of the symantics of how keyboard dispatching should work
* atleast as I understand it.
*
* KeyEvents are dispatched to the focused component. The focus manager gets first
* crack at processing this event. If the focus manager doesn't want it, then
* the JComponent calls super.processKeyEvent() this allows listeners a chance
* to process the event.
*
* If none of the listeners "consumes" the event then the keybindings get a shot.
* This is where things start to get interesting. First, KeyStokes defined with the
* WHEN_FOCUSED condition get a chance. If none of these want the event, then the component
* walks though it's parents looked for actions of type WHEN_ANCESTOR_OF_FOCUSED_COMPONENT.
*
* If no one has taken it yet, then it winds up here. We then look for components registered
* for WHEN_IN_FOCUSED_WINDOW events and fire to them. Note that if none of those are found
* then we pass the event to the menubars and let them have a crack at it. They're handled differently.
*
* Lastly, we check if we're looking at an internal frame. If we are and no one wanted the event
* then we move up to the InternalFrame's creator and see if anyone wants the event (and so on and so on).
*
*
* @see InputMap
*/
class KeyboardManager {
static KeyboardManager currentManager = new KeyboardManager();
/**
* maps top-level containers to a sub-hashtable full of keystrokes
*/
Hashtable<Container, Hashtable<Object, Object>> containerMap = new Hashtable<>();
/**
* Maps component/keystroke pairs to a topLevel container
* This is mainly used for fast unregister operations
*/
Hashtable<ComponentKeyStrokePair, Container> componentKeyStrokeMap = new Hashtable<>();
public static KeyboardManager getCurrentManager() {
return currentManager;
}
public static void setCurrentManager(KeyboardManager km) {
currentManager = km;
}
/**
* register keystrokes here which are for the WHEN_IN_FOCUSED_WINDOW
* case.
* Other types of keystrokes will be handled by walking the hierarchy
* That simplifies some potentially hairy stuff.
*/
public void registerKeyStroke(KeyStroke k, JComponent c) {
Container topContainer = getTopAncestor(c);
if (topContainer == null) {
return;
}
Hashtable<Object, Object> keyMap = containerMap.get(topContainer);
if (keyMap == null) { // lazy evaluate one
keyMap = registerNewTopContainer(topContainer);
}
Object tmp = keyMap.get(k);
if (tmp == null) {
keyMap.put(k,c);
} else if (tmp instanceof Vector) { // if there's a Vector there then add to it.
@SuppressWarnings("unchecked")
Vector<Object> v = (Vector)tmp;
if (!v.contains(c)) { // only add if this keystroke isn't registered for this component
v.addElement(c);
}
} else if (tmp instanceof JComponent) {
// if a JComponent is there then remove it and replace it with a vector
// Then add the old compoennt and the new compoent to the vector
// then insert the vector in the table
if (tmp != c) { // this means this is already registered for this component, no need to dup
Vector<JComponent> v = new Vector<>();
v.addElement((JComponent) tmp);
v.addElement(c);
keyMap.put(k, v);
}
} else {
System.out.println("Unexpected condition in registerKeyStroke");
Thread.dumpStack();
}
componentKeyStrokeMap.put(new ComponentKeyStrokePair(c,k), topContainer);
// Check for EmbeddedFrame case, they know how to process accelerators even
// when focus is not in Java
if (topContainer instanceof EmbeddedFrame) {
((EmbeddedFrame)topContainer).registerAccelerator(k);
}
}
/**
* Find the top focusable Window, Applet, or InternalFrame
*/
@SuppressWarnings("deprecation")
private static Container getTopAncestor(JComponent c) {
for(Container p = c.getParent(); p != null; p = p.getParent()) {
if (p instanceof Window && ((Window)p).isFocusableWindow() ||
p instanceof Applet || p instanceof JInternalFrame) {
return p;
}
}
return null;
}
public void unregisterKeyStroke(KeyStroke ks, JComponent c) {
// component may have already been removed from the hierarchy, we
// need to look up the container using the componentKeyStrokeMap.
ComponentKeyStrokePair ckp = new ComponentKeyStrokePair(c,ks);
Container topContainer = componentKeyStrokeMap.get(ckp);
if (topContainer == null) { // never heard of this pairing, so bail
return;
}
Hashtable<Object, Object> keyMap = containerMap.get(topContainer);
if (keyMap == null) { // this should never happen, but I'm being safe
Thread.dumpStack();
return;
}
Object tmp = keyMap.get(ks);
if (tmp == null) { // this should never happen, but I'm being safe
Thread.dumpStack();
return;
}
if (tmp instanceof JComponent && tmp == c) {
keyMap.remove(ks); // remove the KeyStroke from the Map
//System.out.println("removed a stroke" + ks);
} else if (tmp instanceof Vector ) { // this means there is more than one component reg for this key
Vector<?> v = (Vector)tmp;
v.removeElement(c);
if ( v.isEmpty() ) {
keyMap.remove(ks); // remove the KeyStroke from the Map
//System.out.println("removed a ks vector");
}
}
if ( keyMap.isEmpty() ) { // if no more bindings in this table
containerMap.remove(topContainer); // remove table to enable GC
//System.out.println("removed a container");
}
componentKeyStrokeMap.remove(ckp);
// Check for EmbeddedFrame case, they know how to process accelerators even
// when focus is not in Java
if (topContainer instanceof EmbeddedFrame) {
((EmbeddedFrame)topContainer).unregisterAccelerator(ks);
}
}
/**
* This method is called when the focused component (and none of
* its ancestors) want the key event. This will look up the keystroke
* to see if any chidren (or subchildren) of the specified container
* want a crack at the event.
* If one of them wants it, then it will "DO-THE-RIGHT-THING"
*/
@SuppressWarnings("deprecation")
public boolean fireKeyboardAction(KeyEvent e, boolean pressed, Container topAncestor) {
if (e.isConsumed()) {
System.out.println("Acquired pre-used event!");
Thread.dumpStack();
}
// There may be two keystrokes associated with a low-level key event;
// in this case a keystroke made of an extended key code has a priority.
KeyStroke ks;
KeyStroke ksE = null;
if(e.getID() == KeyEvent.KEY_TYPED) {
ks=KeyStroke.getKeyStroke(e.getKeyChar());
} else {
if(e.getKeyCode() != e.getExtendedKeyCode()) {
ksE=KeyStroke.getKeyStroke(e.getExtendedKeyCode(), e.getModifiers(), !pressed);
}
ks=KeyStroke.getKeyStroke(e.getKeyCode(), e.getModifiers(), !pressed);
}
Hashtable<Object, Object> keyMap = containerMap.get(topAncestor);
if (keyMap != null) { // this container isn't registered, so bail
Object tmp = null;
// extended code has priority
if( ksE != null ) {
tmp = keyMap.get(ksE);
if( tmp != null ) {
ks = ksE;
}
}
if( tmp == null ) {
tmp = keyMap.get(ks);
}
if (tmp == null) {
// don't do anything
} else if ( tmp instanceof JComponent) {
JComponent c = (JComponent)tmp;
if ( c.isShowing() && c.isEnabled() ) { // only give it out if enabled and visible
fireBinding(c, ks, e, pressed);
}
} else if ( tmp instanceof Vector) { //more than one comp registered for this
Vector<?> v = (Vector)tmp;
// There is no well defined order for WHEN_IN_FOCUSED_WINDOW
// bindings, but we give precedence to those bindings just
// added. This is done so that JMenus WHEN_IN_FOCUSED_WINDOW
// bindings are accessed before those of the JRootPane (they
// both have a WHEN_IN_FOCUSED_WINDOW binding for enter).
for (int counter = v.size() - 1; counter >= 0; counter--) {
JComponent c = (JComponent)v.elementAt(counter);
//System.out.println("Trying collision: " + c + " vector = "+ v.size());
if ( c.isShowing() && c.isEnabled() ) { // don't want to give these out
fireBinding(c, ks, e, pressed);
if (e.isConsumed())
return true;
}
}
} else {
System.out.println( "Unexpected condition in fireKeyboardAction " + tmp);
// This means that tmp wasn't null, a JComponent, or a Vector. What is it?
Thread.dumpStack();
}
}
if (e.isConsumed()) {
return true;
}
// if no one else handled it, then give the menus a crack
// The're handled differently. The key is to let any JMenuBars
// process the event
if ( keyMap != null) {
@SuppressWarnings("unchecked")
Vector<JMenuBar> v = (Vector)keyMap.get(JMenuBar.class);
if (v != null) {
Enumeration<JMenuBar> iter = v.elements();
while (iter.hasMoreElements()) {
JMenuBar mb = iter.nextElement();
if ( mb.isShowing() && mb.isEnabled() ) { // don't want to give these out
boolean extended = (ksE != null) && !ksE.equals(ks);
if (extended) {
fireBinding(mb, ksE, e, pressed);
}
if (!extended || !e.isConsumed()) {
fireBinding(mb, ks, e, pressed);
}
if (e.isConsumed()) {
return true;
}
}
}
}
}
return e.isConsumed();
}
void fireBinding(JComponent c, KeyStroke ks, KeyEvent e, boolean pressed) {
if (c.processKeyBinding(ks, e, JComponent.WHEN_IN_FOCUSED_WINDOW,
pressed)) {
e.consume();
}
}
public void registerMenuBar(JMenuBar mb) {
Container top = getTopAncestor(mb);
if (top == null) {
return;
}
Hashtable<Object, Object> keyMap = containerMap.get(top);
if (keyMap == null) { // lazy evaluate one
keyMap = registerNewTopContainer(top);
}
// use the menubar class as the key
@SuppressWarnings("unchecked")
Vector<Object> menuBars = (Vector)keyMap.get(JMenuBar.class);
if (menuBars == null) { // if we don't have a list of menubars,
// then make one.
menuBars = new Vector<>();
keyMap.put(JMenuBar.class, menuBars);
}
if (!menuBars.contains(mb)) {
menuBars.addElement(mb);
}
}
public void unregisterMenuBar(JMenuBar mb) {
Container topContainer = getTopAncestor(mb);
if (topContainer == null) {
return;
}
Hashtable<Object, Object> keyMap = containerMap.get(topContainer);
if (keyMap!=null) {
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