basicpopupmenuui.java

Mobile 应用程序使用 Java Micro Edition (Java ME) 平台

            if (!(ev instanceof MouseEvent)) {
                // We are interested in MouseEvents only
                return;
            }
            MouseEvent me = (MouseEvent) ev;
            Component src = me.getComponent();
            switch (me.getID()) {
            case MouseEvent.MOUSE_PRESSED:
                if (isInPopup(src) ||
                    (src instanceof JMenu && ((JMenu)src).isSelected())) {
                    return;
                }
                if (!(src instanceof JComponent) ||
                   ! (((JComponent)src).getClientProperty("doNotCancelPopup")
                         == BasicComboBoxUI.HIDE_POPUP_KEY)) {
                    // Cancel popup only if this property was not set.
                    // If this property is set to TRUE component wants
                    // to deal with this event by himself.
                    cancelPopupMenu();
                    // Ask UIManager about should we consume event that closes
                    // popup. This made to match native apps behaviour.
                    boolean consumeEvent =
                        UIManager.getBoolean("PopupMenu.consumeEventOnClose");
                    // Consume the event so that normal processing stops.
                    if(consumeEvent && !(src instanceof MenuElement)) {
                        me.consume();
                    }
                }
                break;

            case MouseEvent.MOUSE_RELEASED:
                if(!(src instanceof MenuElement)) {
                    // Do not forward event to MSM, let component handle it
                    if (isInPopup(src)) {
                        break;
                    }
                }
                if(src instanceof JMenu || !(src instanceof JMenuItem)) {
                    MenuSelectionManager.defaultManager().
                        processMouseEvent(me);
                }
                break;
            case MouseEvent.MOUSE_DRAGGED:
                if(!(src instanceof MenuElement)) {
                    // For the MOUSE_DRAGGED event the src is
                    // the Component in which mouse button was pressed. 
                    // If the src is in popupMenu, 
                    // do not forward event to MSM, let component handle it.
                    if (isInPopup(src)) {
                        break;
                    }
                }
                MenuSelectionManager.defaultManager().
                    processMouseEvent(me);
                break;
            case MouseEvent.MOUSE_WHEEL:
                if (isInPopup(src)) {
                    return;
                }
                cancelPopupMenu();
                break;
            }
        }

        boolean isInPopup(Component src) {
            for (Component c=src; c!=null; c=c.getParent()) {
                if (c instanceof Applet || c instanceof Window) {
                    break;
                } else if (c instanceof JPopupMenu) {
                    return true;
                }
            }
            return false;
        }

        void cancelPopupMenu() {
	    JPopupMenu firstPopup = (JPopupMenu)getFirstPopup();
            // 4234793: This action should call firePopupMenuCanceled but it's
            // a protected method. The real solution could be to make 
            // firePopupMenuCanceled public and call it directly.
            List popups = getPopups();
            Iterator iter = popups.iterator();
            while (iter.hasNext()) {
                JPopupMenu popup = (JPopupMenu)iter.next();
                popup.putClientProperty("JPopupMenu.firePopupMenuCanceled", Boolean.TRUE);
            }
            MenuSelectionManager.defaultManager().clearSelectedPath();
        }

        public void componentResized(ComponentEvent e) {
            cancelPopupMenu();
        }
        public void componentMoved(ComponentEvent e) {
            cancelPopupMenu();
        }
        public void componentShown(ComponentEvent e) {
            cancelPopupMenu();
        }
        public void componentHidden(ComponentEvent e) {
            cancelPopupMenu();
        }
        public void windowClosing(WindowEvent e) {
            cancelPopupMenu();
        }
        public void windowClosed(WindowEvent e) {
            cancelPopupMenu();
        }
        public void windowIconified(WindowEvent e) {
            cancelPopupMenu();
        }
        public void windowDeactivated(WindowEvent e) {
            cancelPopupMenu();
        }
        public void windowOpened(WindowEvent e) {}
        public void windowDeiconified(WindowEvent e) {}
        public void windowActivated(WindowEvent e) {}
    }

    /**
     * This helper is added to MenuSelectionManager as a ChangeListener to 
     * listen to menu selection changes. When a menu is activated, it passes
     * focus to its parent JRootPane, and installs an ActionMap/InputMap pair
     * on that JRootPane. Those maps are necessary in order for menu
     * navigation to work. When menu is being deactivated, it restores focus
     * to the component that has had it before menu activation, and uninstalls
     * the maps.
     * This helper is also installed as a KeyListener on root pane when menu
     * is active. It forwards key events to MenuSelectionManager for mnemonic
     * keys handling.
     */
    static class MenuKeyboardHelper
        implements ChangeListener, KeyListener {

        private Component lastFocused = null;
  	private MenuElement[] lastPathSelected = new MenuElement[0];
        private JPopupMenu lastPopup;

        private JRootPane invokerRootPane;
        private ActionMap menuActionMap = getActionMap();
        private InputMap menuInputMap;
        private boolean focusTraversalKeysEnabled;

        /*
         * Fix for 4213634
         * If this is false, KEY_TYPED and KEY_RELEASED events are NOT
         * processed. This is needed to avoid activating a menuitem when
         * the menu and menuitem share the same mnemonic.
         */
        private boolean receivedKeyPressed = false;

        void removeItems() {
            if (lastFocused != null) {
                if(!lastFocused.requestFocusInWindow()) {
                    // Workarounr for 4810575.
                    // If lastFocused is not in currently focused window
                    // requestFocusInWindow will fail. In this case we must
                    // request focus by requestFocus() if it was not
                    // transferred from our popup.
                    Window cfw = KeyboardFocusManager
                                 .getCurrentKeyboardFocusManager()
                                  .getFocusedWindow();
                    if(cfw != null &&
                       "###focusableSwingPopup###".equals(cfw.getName())) {
                        lastFocused.requestFocus();
                    }

                }
                lastFocused = null;
            }
            if (invokerRootPane != null) {
                invokerRootPane.removeKeyListener(this);
                invokerRootPane.setFocusTraversalKeysEnabled(focusTraversalKeysEnabled);
                removeUIInputMap(invokerRootPane, menuInputMap);
                removeUIActionMap(invokerRootPane, menuActionMap);
                invokerRootPane = null;
            } 
            receivedKeyPressed = false;
        }

        private FocusListener rootPaneFocusListener = new FocusAdapter() {
                public void focusGained(FocusEvent ev) {
                    Component opposite = ev.getOppositeComponent();
                    if (opposite != null) {
                        lastFocused = opposite;
                    }
                    ev.getComponent().removeFocusListener(this);
                }
            };

        /**
         * Return the last JPopupMenu in <code>path</code>,
         * or <code>null</code> if none found
         */
        JPopupMenu getActivePopup(MenuElement[] path) {
            for (int i=path.length-1; i>=0; i--) {
                MenuElement elem = path[i];
                if (elem instanceof JPopupMenu) {
                    return (JPopupMenu)elem;
                }
            }
            return null;
        }

        void addUIInputMap(JComponent c, InputMap map) {
            InputMap lastNonUI = null;
            InputMap parent = c.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);

            while (parent != null && !(parent instanceof UIResource)) {
                lastNonUI = parent;
                parent = parent.getParent();
            }

            if (lastNonUI == null) {
                c.setInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW, map);
            } else {
                lastNonUI.setParent(map);
            }
            map.setParent(parent);
        }

        void addUIActionMap(JComponent c, ActionMap map) {
            ActionMap lastNonUI = null;
            ActionMap parent = c.getActionMap();

            while (parent != null && !(parent instanceof UIResource)) {
                lastNonUI = parent;
                parent = parent.getParent();
            }

            if (lastNonUI == null) {
                c.setActionMap(map);
            } else {
                lastNonUI.setParent(map);
            }
            map.setParent(parent);
        }

        void removeUIInputMap(JComponent c, InputMap map) {
            InputMap im = null;
            InputMap parent = c.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);

            while (parent != null) {
                if (parent == map) {
                    if (im == null) {
                        c.setInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW,
                                      map.getParent());
                    } else {
                        im.setParent(map.getParent());
                    }
                    break;
                }
                im = parent;
                parent = parent.getParent();
            }
        }

        void removeUIActionMap(JComponent c, ActionMap map) {
            ActionMap im = null;
            ActionMap parent = c.getActionMap();

            while (parent != null) {
                if (parent == map) {
                    if (im == null) {
                        c.setActionMap(map.getParent());
                    } else {
                        im.setParent(map.getParent());
                    }
                    break;
                }
                im = parent;
                parent = parent.getParent();
            }
        }

        public void stateChanged(ChangeEvent ev) {
            if (!(UIManager.getLookAndFeel() instanceof BasicLookAndFeel)) {
                uninstall();
                return;
            }
	    MenuSelectionManager msm = (MenuSelectionManager)ev.getSource();
	    MenuElement[] p = msm.getSelectedPath();
            JPopupMenu popup = getActivePopup(p);
            if (popup != null && !popup.isFocusable()) {
                // Do nothing for non-focusable popups
                return;
            }

            if (lastPathSelected.length != 0 && p.length != 0 ) {
                if (!checkInvokerEqual(p[0],lastPathSelected[0])) {
                    removeItems();
                    lastPathSelected = new MenuElement[0];
                }
            }

	    if (lastPathSelected.length == 0 && p.length > 0) {
                // menu posted
                JComponent invoker;

                if (popup == null) {
                    if (p.length == 2 && p[0] instanceof JMenuBar &&
                        p[1] instanceof JMenu) {
                        // a menu has been selected but not open
                        invoker = (JComponent)p[1];
                        popup = ((JMenu)invoker).getPopupMenu();
                    } else {
                        return;
                    }
                } else {
                    Component c = popup.getInvoker();
                    if(c instanceof JFrame) {
                        invoker = ((JFrame)c).getRootPane();
                    } else if(c instanceof JDialog) {
                        invoker = ((JDialog)c).getRootPane();
                    } else if(c instanceof JApplet) {
                        invoker = ((JApplet)c).getRootPane();
                    } else {
                        while (!(c instanceof JComponent)) {
                            if (c == null) {
                                return;
                            }
                            c = c.getParent();
                        }
                        invoker = (JComponent)c;
                    }
                }

                // remember current focus owner
                lastFocused = KeyboardFocusManager.
                    getCurrentKeyboardFocusManager().getFocusOwner();

                // request focus on root pane and install keybindings
                // used for menu navigation
                invokerRootPane = SwingUtilities.getRootPane(invoker);
                if (invokerRootPane != null) {
                    invokerRootPane.addFocusListener(rootPaneFocusListener);
                    invokerRootPane.requestFocus(true);
                    invokerRootPane.addKeyListener(this);
                    focusTraversalKeysEnabled = invokerRootPane.
                                      getFocusTraversalKeysEnabled();
                    invokerRootPane.setFocusTraversalKeysEnabled(false);

                    menuInputMap = getInputMap(popup, invokerRootPane);
                    addUIInputMap(invokerRootPane, menuInputMap);
                    addUIActionMap(invokerRootPane, menuActionMap);
                }
            } else if (lastPathSelected.length != 0 && p.length == 0) {
		// menu hidden -- return focus to where it had been before
                // and uninstall menu keybindings
                   removeItems();
	    } else {
                if (popup != lastPopup) {
                    receivedKeyPressed = false;
                }
            }

            // Remember the last path selected
            lastPathSelected = p;
            lastPopup = popup;
        }

        public void keyPressed(KeyEvent ev) {
            receivedKeyPressed = true;
            MenuSelectionManager.defaultManager().processKeyEvent(ev);
        }

        public void keyReleased(KeyEvent ev) {
	    if (receivedKeyPressed) {
		receivedKeyPressed = false;
                MenuSelectionManager.defaultManager().processKeyEvent(ev);
            }
        }

        public void keyTyped(KeyEvent ev) {
	    if (receivedKeyPressed) {
                MenuSelectionManager.defaultManager().processKeyEvent(ev);
            }
        }

        void uninstall() {
            synchronized (MENU_KEYBOARD_HELPER_KEY) {
                MenuSelectionManager.defaultManager().removeChangeListener(this);
                AppContext.getAppContext().remove(MENU_KEYBOARD_HELPER_KEY);
            }
        }
    }
}