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   25   package javax.swing;
   26   
   27   import java.awt.Component;
   28   import java.awt.Container;
   29   import java.awt.Window;
   30   import java.util;
   31   import java.awt.FocusTraversalPolicy;
   32   import sun.util.logging.PlatformLogger;
   33   
   34   /**
   35    * A FocusTraversalPolicy that determines traversal order by sorting the
   36    * Components of a focus traversal cycle based on a given Comparator. Portions
   37    * of the Component hierarchy that are not visible and displayable will not be
   38    * included.
   39    * <p>
   40    * By default, SortingFocusTraversalPolicy implicitly transfers focus down-
   41    * cycle. That is, during normal focus traversal, the Component
   42    * traversed after a focus cycle root will be the focus-cycle-root's default
   43    * Component to focus. This behavior can be disabled using the
   44    * <code>setImplicitDownCycleTraversal</code> method.
   45    * <p>
   46    * By default, methods of this class with return a Component only if it is
   47    * visible, displayable, enabled, and focusable. Subclasses can modify this
   48    * behavior by overriding the <code>accept</code> method.
   49    * <p>
   50    * This policy takes into account <a
   51    * href="../../java/awt/doc-files/FocusSpec.html#FocusTraversalPolicyProviders">focus traversal
   52    * policy providers</a>.  When searching for first/last/next/previous Component,
   53    * if a focus traversal policy provider is encountered, its focus traversal
   54    * policy is used to perform the search operation.
   55    *
   56    * @author David Mendenhall
   57    *
   58    * @see java.util.Comparator
   59    * @since 1.4
   60    */
   61   public class SortingFocusTraversalPolicy
   62       extends InternalFrameFocusTraversalPolicy
   63   {
   64       private Comparator<? super Component> comparator;
   65       private boolean implicitDownCycleTraversal = true;
   66   
   67       private PlatformLogger log = PlatformLogger.getLogger("javax.swing.SortingFocusTraversalPolicy");
   68   
   69       /**
   70        * Used by getComponentAfter and getComponentBefore for efficiency. In
   71        * order to maintain compliance with the specification of
   72        * FocusTraversalPolicy, if traversal wraps, we should invoke
   73        * getFirstComponent or getLastComponent. These methods may be overriden in
   74        * subclasses to behave in a non-generic way. However, in the generic case,
   75        * these methods will simply return the first or last Components of the
   76        * sorted list, respectively. Since getComponentAfter and
   77        * getComponentBefore have already built the sorted list before determining
   78        * that they need to invoke getFirstComponent or getLastComponent, the
   79        * sorted list should be reused if possible.
   80        */
   81       transient private Container cachedRoot;
   82       transient private List<Component> cachedCycle;
   83   
   84       // Delegate our fitness test to ContainerOrder so that we only have to
   85       // code the algorithm once.
   86       private static final SwingContainerOrderFocusTraversalPolicy
   87           fitnessTestPolicy = new SwingContainerOrderFocusTraversalPolicy();
   88   
   89       final private int FORWARD_TRAVERSAL = 0;
   90       final private int BACKWARD_TRAVERSAL = 1;
   91   
   92       /**
   93        * Constructs a SortingFocusTraversalPolicy without a Comparator.
   94        * Subclasses must set the Comparator using <code>setComparator</code>
   95        * before installing this FocusTraversalPolicy on a focus cycle root or
   96        * KeyboardFocusManager.
   97        */
   98       protected SortingFocusTraversalPolicy() {
   99       }
  100   
  101       /**
  102        * Constructs a SortingFocusTraversalPolicy with the specified Comparator.
  103        */
  104       public SortingFocusTraversalPolicy(Comparator<? super Component> comparator) {
  105           this.comparator = comparator;
  106       }
  107   
  108       private List<Component> getFocusTraversalCycle(Container aContainer) {
  109           List<Component> cycle = new ArrayList<Component>();
  110           enumerateAndSortCycle(aContainer, cycle);
  111           return cycle;
  112       }
  113       private int getComponentIndex(List<Component> cycle, Component aComponent) {
  114           int index;
  115           try {
  116               index = Collections.binarySearch(cycle, aComponent, comparator);
  117           } catch (ClassCastException e) {
  118               if (log.isLoggable(PlatformLogger.FINE)) {
  119                   log.fine("### During the binary search for " + aComponent + " the exception occured: ", e);
  120               }
  121               return -1;
  122           }
  123           if (index < 0) {
  124               // Fix for 5070991.
  125               // A workaround for a transitivity problem caused by ROW_TOLERANCE,
  126               // because of that the component may be missed in the binary search.
  127               // Try to search it again directly.
  128               index = cycle.indexOf(aComponent);
  129           }
  130           return index;
  131       }
  132   
  133       private void enumerateAndSortCycle(Container focusCycleRoot, List<Component> cycle) {
  134           if (focusCycleRoot.isShowing()) {
  135               enumerateCycle(focusCycleRoot, cycle);
  136               Collections.sort(cycle, comparator);
  137           }
  138       }
  139   
  140       private void enumerateCycle(Container container, List<Component> cycle) {
  141           if (!(container.isVisible() && container.isDisplayable())) {
  142               return;
  143           }
  144   
  145           cycle.add(container);
  146   
  147           Component[] components = container.getComponents();
  148           for (Component comp : components) {
  149               if (comp instanceof Container) {
  150                   Container cont = (Container)comp;
  151   
  152                   if (!cont.isFocusCycleRoot() &&
  153                       !cont.isFocusTraversalPolicyProvider() &&
  154                       !((cont instanceof JComponent) && ((JComponent)cont).isManagingFocus()))
  155                   {
  156                       enumerateCycle(cont, cycle);
  157                       continue;
  158                   }
  159               }
  160               cycle.add(comp);
  161           }
  162       }
  163   
  164       Container getTopmostProvider(Container focusCycleRoot, Component aComponent) {
  165           Container aCont = aComponent.getParent();
  166           Container ftp = null;
  167           while (aCont  != focusCycleRoot && aCont != null) {
  168               if (aCont.isFocusTraversalPolicyProvider()) {
  169                   ftp = aCont;
  170               }
  171               aCont = aCont.getParent();
  172           }
  173           if (aCont == null) {
  174               return null;
  175           }
  176           return ftp;
  177       }
  178   
  179       /*
  180        * Checks if a new focus cycle takes place and returns a Component to traverse focus to.
  181        * @param comp a possible focus cycle root or policy provider
  182        * @param traversalDirection the direction of the traversal
  183        * @return a Component to traverse focus to if {@code comp} is a root or provider
  184        *         and implicit down-cycle is set, otherwise {@code null}
  185        */
  186       private Component getComponentDownCycle(Component comp, int traversalDirection) {
  187           Component retComp = null;
  188   
  189           if (comp instanceof Container) {
  190               Container cont = (Container)comp;
  191   
  192               if (cont.isFocusCycleRoot()) {
  193                   if (getImplicitDownCycleTraversal()) {
  194                       retComp = cont.getFocusTraversalPolicy().getDefaultComponent(cont);
  195   
  196                       if (retComp != null && log.isLoggable(PlatformLogger.FINE)) {
  197                           log.fine("### Transfered focus down-cycle to " + retComp +
  198                                    " in the focus cycle root " + cont);
  199                       }
  200                   } else {
  201                       return null;
  202                   }
  203               } else if (cont.isFocusTraversalPolicyProvider()) {
  204                   retComp = (traversalDirection == FORWARD_TRAVERSAL ?
  205                              cont.getFocusTraversalPolicy().getDefaultComponent(cont) :
  206                              cont.getFocusTraversalPolicy().getLastComponent(cont));
  207   
  208                   if (retComp != null && log.isLoggable(PlatformLogger.FINE)) {
  209                       log.fine("### Transfered focus to " + retComp + " in the FTP provider " + cont);
  210                   }
  211               }
  212           }
  213           return retComp;
  214       }
  215   
  216       /**
  217        * Returns the Component that should receive the focus after aComponent.
  218        * aContainer must be a focus cycle root of aComponent or a focus traversal policy provider.
  219        * <p>
  220        * By default, SortingFocusTraversalPolicy implicitly transfers focus down-
  221        * cycle. That is, during normal focus traversal, the Component
  222        * traversed after a focus cycle root will be the focus-cycle-root's
  223        * default Component to focus. This behavior can be disabled using the
  224        * <code>setImplicitDownCycleTraversal</code> method.
  225        * <p>
  226        * If aContainer is <a href="../../java/awt/doc-files/FocusSpec.html#FocusTraversalPolicyProviders">focus
  227        * traversal policy provider</a>, the focus is always transferred down-cycle.
  228        *
  229        * @param aContainer a focus cycle root of aComponent or a focus traversal policy provider
  230        * @param aComponent a (possibly indirect) child of aContainer, or
  231        *        aContainer itself
  232        * @return the Component that should receive the focus after aComponent, or
  233        *         null if no suitable Component can be found
  234        * @throws IllegalArgumentException if aContainer is not a focus cycle
  235        *         root of aComponent or a focus traversal policy provider, or if either aContainer or
  236        *         aComponent is null
  237        */
  238       public Component getComponentAfter(Container aContainer, Component aComponent) {
  239           if (log.isLoggable(PlatformLogger.FINE)) {
  240               log.fine("### Searching in " + aContainer + " for component after " + aComponent);
  241           }
  242   
  243           if (aContainer == null || aComponent == null) {
  244               throw new IllegalArgumentException("aContainer and aComponent cannot be null");
  245           }
  246           if (!aContainer.isFocusTraversalPolicyProvider() && !aContainer.isFocusCycleRoot()) {
  247               throw new IllegalArgumentException("aContainer should be focus cycle root or focus traversal policy provider");
  248   
  249           } else if (aContainer.isFocusCycleRoot() && !aComponent.isFocusCycleRoot(aContainer)) {
  250               throw new IllegalArgumentException("aContainer is not a focus cycle root of aComponent");
  251           }
  252   
  253           // Before all the ckecks below we first see if it's an FTP provider or a focus cycle root.
  254           // If it's the case just go down cycle (if it's set to "implicit").
  255           Component comp = getComponentDownCycle(aComponent, FORWARD_TRAVERSAL);
  256           if (comp != null) {
  257               return comp;
  258           }
  259   
  260           // See if the component is inside of policy provider.
  261           Container provider = getTopmostProvider(aContainer, aComponent);
  262           if (provider != null) {
  263               if (log.isLoggable(PlatformLogger.FINE)) {
  264                   log.fine("### Asking FTP " + provider + " for component after " + aComponent);
  265               }
  266   
  267               // FTP knows how to find component after the given. We don't.
  268               FocusTraversalPolicy policy = provider.getFocusTraversalPolicy();
  269               Component afterComp = policy.getComponentAfter(provider, aComponent);
  270   
  271               // Null result means that we overstepped the limit of the FTP's cycle.
  272               // In that case we must quit the cycle, otherwise return the component found.
  273               if (afterComp != null) {
  274                   if (log.isLoggable(PlatformLogger.FINE)) log.fine("### FTP returned " + afterComp);
  275                   return afterComp;
  276               }
  277               aComponent = provider;
  278           }
  279   
  280           List<Component> cycle = getFocusTraversalCycle(aContainer);
  281   
  282           if (log.isLoggable(PlatformLogger.FINE)) log.fine("### Cycle is " + cycle + ", component is " + aComponent);
  283   
  284           int index = getComponentIndex(cycle, aComponent);
  285   
  286           if (index < 0) {
  287               if (log.isLoggable(PlatformLogger.FINE)) {
  288                   log.fine("### Didn't find component " + aComponent + " in a cycle " + aContainer);
  289               }
  290               return getFirstComponent(aContainer);
  291           }
  292   
  293           for (index++; index < cycle.size(); index++) {
  294               comp = cycle.get(index);
  295               if (accept(comp)) {
  296                   return comp;
  297               } else if ((comp = getComponentDownCycle(comp, FORWARD_TRAVERSAL)) != null) {
  298                   return comp;
  299               }
  300           }
  301   
  302           if (aContainer.isFocusCycleRoot()) {
  303               this.cachedRoot = aContainer;
  304               this.cachedCycle = cycle;
  305   
  306               comp = getFirstComponent(aContainer);
  307   
  308               this.cachedRoot = null;
  309               this.cachedCycle = null;
  310   
  311               return comp;
  312           }
  313           return null;
  314       }
  315   
  316       /**
  317        * Returns the Component that should receive the focus before aComponent.
  318        * aContainer must be a focus cycle root of aComponent or a focus traversal policy provider.
  319        * <p>
  320        * By default, SortingFocusTraversalPolicy implicitly transfers focus down-
  321        * cycle. That is, during normal focus traversal, the Component
  322        * traversed after a focus cycle root will be the focus-cycle-root's
  323        * default Component to focus. This behavior can be disabled using the
  324        * <code>setImplicitDownCycleTraversal</code> method.
  325        * <p>
  326        * If aContainer is <a href="../../java/awt/doc-files/FocusSpec.html#FocusTraversalPolicyProviders">focus
  327        * traversal policy provider</a>, the focus is always transferred down-cycle.
  328        *
  329        * @param aContainer a focus cycle root of aComponent or a focus traversal policy provider
  330        * @param aComponent a (possibly indirect) child of aContainer, or
  331        *        aContainer itself
  332        * @return the Component that should receive the focus before aComponent,
  333        *         or null if no suitable Component can be found
  334        * @throws IllegalArgumentException if aContainer is not a focus cycle
  335        *         root of aComponent or a focus traversal policy provider, or if either aContainer or
  336        *         aComponent is null
  337        */
  338       public Component getComponentBefore(Container aContainer, Component aComponent) {
  339           if (aContainer == null || aComponent == null) {
  340               throw new IllegalArgumentException("aContainer and aComponent cannot be null");
  341           }
  342           if (!aContainer.isFocusTraversalPolicyProvider() && !aContainer.isFocusCycleRoot()) {
  343               throw new IllegalArgumentException("aContainer should be focus cycle root or focus traversal policy provider");
  344   
  345           } else if (aContainer.isFocusCycleRoot() && !aComponent.isFocusCycleRoot(aContainer)) {
  346               throw new IllegalArgumentException("aContainer is not a focus cycle root of aComponent");
  347           }
  348   
  349           // See if the component is inside of policy provider.
  350           Container provider = getTopmostProvider(aContainer, aComponent);
  351           if (provider != null) {
  352               if (log.isLoggable(PlatformLogger.FINE)) {
  353                   log.fine("### Asking FTP " + provider + " for component after " + aComponent);
  354               }
  355   
  356               // FTP knows how to find component after the given. We don't.
  357               FocusTraversalPolicy policy = provider.getFocusTraversalPolicy();
  358               Component beforeComp = policy.getComponentBefore(provider, aComponent);
  359   
  360               // Null result means that we overstepped the limit of the FTP's cycle.
  361               // In that case we must quit the cycle, otherwise return the component found.
  362               if (beforeComp != null) {
  363                   if (log.isLoggable(PlatformLogger.FINE)) log.fine("### FTP returned " + beforeComp);
  364                   return beforeComp;
  365               }
  366               aComponent = provider;
  367   
  368               // If the provider is traversable it's returned.
  369               if (accept(aComponent)) {
  370                   return aComponent;
  371               }
  372           }
  373   
  374           List<Component> cycle = getFocusTraversalCycle(aContainer);
  375   
  376           if (log.isLoggable(PlatformLogger.FINE)) log.fine("### Cycle is " + cycle + ", component is " + aComponent);
  377   
  378           int index = getComponentIndex(cycle, aComponent);
  379   
  380           if (index < 0) {
  381               if (log.isLoggable(PlatformLogger.FINE)) {
  382                   log.fine("### Didn't find component " + aComponent + " in a cycle " + aContainer);
  383               }
  384               return getLastComponent(aContainer);
  385           }
  386   
  387           Component comp;
  388           Component tryComp;
  389   
  390           for (index--; index>=0; index--) {
  391               comp = cycle.get(index);
  392               if (comp != aContainer && (tryComp = getComponentDownCycle(comp, BACKWARD_TRAVERSAL)) != null) {
  393                   return tryComp;
  394               } else if (accept(comp)) {
  395                   return comp;
  396               }
  397           }
  398   
  399           if (aContainer.isFocusCycleRoot()) {
  400               this.cachedRoot = aContainer;
  401               this.cachedCycle = cycle;
  402   
  403               comp = getLastComponent(aContainer);
  404   
  405               this.cachedRoot = null;
  406               this.cachedCycle = null;
  407   
  408               return comp;
  409           }
  410           return null;
  411       }
  412   
  413       /**
  414        * Returns the first Component in the traversal cycle. This method is used
  415        * to determine the next Component to focus when traversal wraps in the
  416        * forward direction.
  417        *
  418        * @param aContainer a focus cycle root of aComponent or a focus traversal policy provider whose
  419        *        first Component is to be returned
  420        * @return the first Component in the traversal cycle of aContainer,
  421        *         or null if no suitable Component can be found
  422        * @throws IllegalArgumentException if aContainer is null
  423        */
  424       public Component getFirstComponent(Container aContainer) {
  425           List<Component> cycle;
  426   
  427           if (log.isLoggable(PlatformLogger.FINE)) log.fine("### Getting first component in " + aContainer);
  428           if (aContainer == null) {
  429               throw new IllegalArgumentException("aContainer cannot be null");
  430           }
  431   
  432           if (this.cachedRoot == aContainer) {
  433               cycle = this.cachedCycle;
  434           } else {
  435               cycle = getFocusTraversalCycle(aContainer);
  436           }
  437   
  438           if (cycle.size() == 0) {
  439               if (log.isLoggable(PlatformLogger.FINE)) log.fine("### Cycle is empty");
  440               return null;
  441           }
  442           if (log.isLoggable(PlatformLogger.FINE)) log.fine("### Cycle is " + cycle);
  443   
  444           for (Component comp : cycle) {
  445               if (accept(comp)) {
  446                   return comp;
  447               } else if (comp != aContainer &&
  448                          (comp = getComponentDownCycle(comp, FORWARD_TRAVERSAL)) != null)
  449               {
  450                   return comp;
  451               }
  452           }
  453           return null;
  454       }
  455   
  456       /**
  457        * Returns the last Component in the traversal cycle. This method is used
  458        * to determine the next Component to focus when traversal wraps in the
  459        * reverse direction.
  460        *
  461        * @param aContainer a focus cycle root of aComponent or a focus traversal policy provider whose
  462        *        last Component is to be returned
  463        * @return the last Component in the traversal cycle of aContainer,
  464        *         or null if no suitable Component can be found
  465        * @throws IllegalArgumentException if aContainer is null
  466        */
  467       public Component getLastComponent(Container aContainer) {
  468           List<Component> cycle;
  469           if (log.isLoggable(PlatformLogger.FINE)) log.fine("### Getting last component in " + aContainer);
  470   
  471           if (aContainer == null) {
  472               throw new IllegalArgumentException("aContainer cannot be null");
  473           }
  474   
  475           if (this.cachedRoot == aContainer) {
  476               cycle = this.cachedCycle;
  477           } else {
  478               cycle = getFocusTraversalCycle(aContainer);
  479           }
  480   
  481           if (cycle.size() == 0) {
  482               if (log.isLoggable(PlatformLogger.FINE)) log.fine("### Cycle is empty");
  483               return null;
  484           }
  485           if (log.isLoggable(PlatformLogger.FINE)) log.fine("### Cycle is " + cycle);
  486   
  487           for (int i= cycle.size() - 1; i >= 0; i--) {
  488               Component comp = cycle.get(i);
  489               if (accept(comp)) {
  490                   return comp;
  491               } else if (comp instanceof Container && comp != aContainer) {
  492                   Container cont = (Container)comp;
  493                   if (cont.isFocusTraversalPolicyProvider()) {
  494                       return cont.getFocusTraversalPolicy().getLastComponent(cont);
  495                   }
  496               }
  497           }
  498           return null;
  499       }
  500   
  501       /**
  502        * Returns the default Component to focus. This Component will be the first
  503        * to receive focus when traversing down into a new focus traversal cycle
  504        * rooted at aContainer. The default implementation of this method
  505        * returns the same Component as <code>getFirstComponent</code>.
  506        *
  507        * @param aContainer a focus cycle root of aComponent or a focus traversal policy provider whose
  508        *        default Component is to be returned
  509        * @return the default Component in the traversal cycle of aContainer,
  510        *         or null if no suitable Component can be found
  511        * @see #getFirstComponent
  512        * @throws IllegalArgumentException if aContainer is null
  513        */
  514       public Component getDefaultComponent(Container aContainer) {
  515           return getFirstComponent(aContainer);
  516       }
  517   
  518       /**
  519        * Sets whether this SortingFocusTraversalPolicy transfers focus down-cycle
  520        * implicitly. If <code>true</code>, during normal focus traversal,
  521        * the Component traversed after a focus cycle root will be the focus-
  522        * cycle-root's default Component to focus. If <code>false</code>, the
  523        * next Component in the focus traversal cycle rooted at the specified
  524        * focus cycle root will be traversed instead. The default value for this
  525        * property is <code>true</code>.
  526        *
  527        * @param implicitDownCycleTraversal whether this
  528        *        SortingFocusTraversalPolicy transfers focus down-cycle implicitly
  529        * @see #getImplicitDownCycleTraversal
  530        * @see #getFirstComponent
  531        */
  532       public void setImplicitDownCycleTraversal(boolean implicitDownCycleTraversal) {
  533           this.implicitDownCycleTraversal = implicitDownCycleTraversal;
  534       }
  535   
  536       /**
  537        * Returns whether this SortingFocusTraversalPolicy transfers focus down-
  538        * cycle implicitly. If <code>true</code>, during normal focus
  539        * traversal, the Component traversed after a focus cycle root will be the
  540        * focus-cycle-root's default Component to focus. If <code>false</code>,
  541        * the next Component in the focus traversal cycle rooted at the specified
  542        * focus cycle root will be traversed instead.
  543        *
  544        * @return whether this SortingFocusTraversalPolicy transfers focus down-
  545        *         cycle implicitly
  546        * @see #setImplicitDownCycleTraversal
  547        * @see #getFirstComponent
  548        */
  549       public boolean getImplicitDownCycleTraversal() {
  550           return implicitDownCycleTraversal;
  551       }
  552   
  553       /**
  554        * Sets the Comparator which will be used to sort the Components in a
  555        * focus traversal cycle.
  556        *
  557        * @param comparator the Comparator which will be used for sorting
  558        */
  559       protected void setComparator(Comparator<? super Component> comparator) {
  560           this.comparator = comparator;
  561       }
  562   
  563       /**
  564        * Returns the Comparator which will be used to sort the Components in a
  565        * focus traversal cycle.
  566        *
  567        * @return the Comparator which will be used for sorting
  568        */
  569       protected Comparator<? super Component> getComparator() {
  570           return comparator;
  571       }
  572   
  573       /**
  574        * Determines whether a Component is an acceptable choice as the new
  575        * focus owner. By default, this method will accept a Component if and
  576        * only if it is visible, displayable, enabled, and focusable.
  577        *
  578        * @param aComponent the Component whose fitness as a focus owner is to
  579        *        be tested
  580        * @return <code>true</code> if aComponent is visible, displayable,
  581        *         enabled, and focusable; <code>false</code> otherwise
  582        */
  583       protected boolean accept(Component aComponent) {
  584           return fitnessTestPolicy.accept(aComponent);
  585       }
  586   }
  587   
  588   // Create our own subclass and change accept to public so that we can call
  589   // accept.
  590   class SwingContainerOrderFocusTraversalPolicy
  591       extends java.awt.ContainerOrderFocusTraversalPolicy
  592   {
  593       public boolean accept(Component aComponent) {
  594           return super.accept(aComponent);
  595       }
  596   }

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