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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/javax/swing/JMenu.java
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+/* JMenu.java --
+ Copyright (C) 2002, 2004, 2005, 2006 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath 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 for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING. If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library. Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module. An independent module is a module which is not derived from
+or based on this library. If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so. If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package javax.swing;
+
+import java.awt.Component;
+import java.awt.Dimension;
+import java.awt.GraphicsConfiguration;
+import java.awt.GraphicsDevice;
+import java.awt.GraphicsEnvironment;
+import java.awt.Insets;
+import java.awt.Point;
+import java.awt.Rectangle;
+import java.awt.Toolkit;
+import java.awt.event.KeyEvent;
+import java.awt.event.WindowAdapter;
+import java.awt.event.WindowEvent;
+import java.beans.PropertyChangeEvent;
+import java.beans.PropertyChangeListener;
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.EventListener;
+
+import javax.accessibility.Accessible;
+import javax.accessibility.AccessibleContext;
+import javax.accessibility.AccessibleRole;
+import javax.accessibility.AccessibleSelection;
+import javax.swing.event.ChangeEvent;
+import javax.swing.event.ChangeListener;
+import javax.swing.event.MenuEvent;
+import javax.swing.event.MenuListener;
+import javax.swing.plaf.MenuItemUI;
+
+/**
+ * This class represents a menu that can be added to a menu bar or
+ * can be a submenu in some other menu. When JMenu is selected it
+ * displays JPopupMenu containing its menu items.
+ *
+ * <p>
+ * JMenu's fires MenuEvents when this menu's selection changes. If this menu
+ * is selected, then fireMenuSelectedEvent() is invoked. In case when menu is
+ * deselected or cancelled, then fireMenuDeselectedEvent() or
+ * fireMenuCancelledEvent() is invoked, respectivelly.
+ * </p>
+ */
+public class JMenu extends JMenuItem implements Accessible, MenuElement
+{
+ /**
+ * Receives notifications when the JMenu's ButtonModel is changed and
+ * fires menuSelected or menuDeselected events when appropriate.
+ */
+ private class MenuChangeListener
+ implements ChangeListener
+ {
+ /**
+ * Indicates the last selected state.
+ */
+ private boolean selected;
+
+ /**
+ * Receives notification when the JMenu's ButtonModel changes.
+ */
+ public void stateChanged(ChangeEvent ev)
+ {
+ ButtonModel m = (ButtonModel) ev.getSource();
+ boolean s = m.isSelected();
+ if (s != selected)
+ {
+ if (s)
+ fireMenuSelected();
+ else
+ fireMenuDeselected();
+ selected = s;
+ }
+ }
+ }
+
+ private static final long serialVersionUID = 4227225638931828014L;
+
+ /** A Popup menu associated with this menu, which pops up when menu is selected */
+ private JPopupMenu popupMenu = null;
+
+ /** Whenever menu is selected or deselected the MenuEvent is fired to
+ menu's registered listeners. */
+ private MenuEvent menuEvent = new MenuEvent(this);
+
+ /*Amount of time, in milliseconds, that should pass before popupMenu
+ associated with this menu appears or disappers */
+ private int delay;
+
+ /* PopupListener */
+ protected WinListener popupListener;
+
+ /**
+ * Location at which popup menu associated with this menu will be
+ * displayed
+ */
+ private Point menuLocation;
+
+ /**
+ * The ChangeListener for the ButtonModel.
+ *
+ * @see MenuChangeListener
+ */
+ private ChangeListener menuChangeListener;
+
+ /**
+ * Creates a new JMenu object.
+ */
+ public JMenu()
+ {
+ super();
+ setOpaque(false);
+ }
+
+ /**
+ * Creates a new <code>JMenu</code> with the specified label.
+ *
+ * @param text label for this menu
+ */
+ public JMenu(String text)
+ {
+ super(text);
+ popupMenu = new JPopupMenu();
+ popupMenu.setInvoker(this);
+ setOpaque(false);
+ }
+
+ /**
+ * Creates a new <code>JMenu</code> object.
+ *
+ * @param action Action that is used to create menu item tha will be
+ * added to the menu.
+ */
+ public JMenu(Action action)
+ {
+ super(action);
+ createActionChangeListener(this);
+ popupMenu = new JPopupMenu();
+ popupMenu.setInvoker(this);
+ setOpaque(false);
+ }
+
+ /**
+ * Creates a new <code>JMenu</code> with specified label and an option
+ * for this menu to be tear-off menu.
+ *
+ * @param text label for this menu
+ * @param tearoff true if this menu should be tear-off and false otherwise
+ */
+ public JMenu(String text, boolean tearoff)
+ {
+ // FIXME: tearoff not implemented
+ this(text);
+ }
+
+ /**
+ * Adds specified menu item to this menu
+ *
+ * @param item Menu item to add to this menu
+ *
+ * @return Menu item that was added
+ */
+ public JMenuItem add(JMenuItem item)
+ {
+ return getPopupMenu().add(item);
+ }
+
+ /**
+ * Adds specified component to this menu.
+ *
+ * @param component Component to add to this menu
+ *
+ * @return Component that was added
+ */
+ public Component add(Component component)
+ {
+ getPopupMenu().insert(component, -1);
+ return component;
+ }
+
+ /**
+ * Adds specified component to this menu at the given index
+ *
+ * @param component Component to add
+ * @param index Position of this menu item in the menu
+ *
+ * @return Component that was added
+ */
+ public Component add(Component component, int index)
+ {
+ return getPopupMenu().add(component, index);
+ }
+
+ /**
+ * Adds JMenuItem constructed with the specified label to this menu
+ *
+ * @param text label for the menu item that will be added
+ *
+ * @return Menu Item that was added to this menu
+ */
+ public JMenuItem add(String text)
+ {
+ return add(new JMenuItem(text));
+ }
+
+ /**
+ * Adds JMenuItem constructed using properties from specified action.
+ *
+ * @param action action to construct the menu item with
+ *
+ * @return Menu Item that was added to this menu
+ */
+ public JMenuItem add(Action action)
+ {
+ JMenuItem i = createActionComponent(action);
+ i.setAction(action);
+ add(i);
+ return i;
+ }
+
+ /**
+ * Removes given menu item from this menu. Nothing happens if
+ * this menu doesn't contain specified menu item.
+ *
+ * @param item Menu Item which needs to be removed
+ */
+ public void remove(JMenuItem item)
+ {
+ getPopupMenu().remove(item);
+ }
+
+ /**
+ * Removes component at the specified index from this menu
+ *
+ * @param index Position of the component that needs to be removed in the menu
+ */
+ public void remove(int index)
+ {
+ if (index < 0 || (index > 0 && getMenuComponentCount() == 0))
+ throw new IllegalArgumentException();
+
+ if (getMenuComponentCount() > 0)
+ popupMenu.remove(index);
+ }
+
+ /**
+ * Removes given component from this menu.
+ *
+ * @param component Component to remove
+ */
+ public void remove(Component component)
+ {
+ int index = getPopupMenu().getComponentIndex(component);
+ if (index >= 0)
+ getPopupMenu().remove(index);
+ }
+
+ /**
+ * Removes all menu items from the menu
+ */
+ public void removeAll()
+ {
+ if (popupMenu != null)
+ popupMenu.removeAll();
+ }
+
+ /**
+ * Creates JMenuItem with the specified text and inserts it in the
+ * at the specified index
+ *
+ * @param text label for the new menu item
+ * @param index index at which to insert newly created menu item.
+ */
+ public void insert(String text, int index)
+ {
+ this.insert(new JMenuItem(text), index);
+ }
+
+ /**
+ * Creates JMenuItem with the specified text and inserts it in the
+ * at the specified index. IllegalArgumentException is thrown
+ * if index is less than 0
+ *
+ * @param item menu item to insert
+ * @param index index at which to insert menu item.
+ * @return Menu item that was added to the menu
+ */
+ public JMenuItem insert(JMenuItem item, int index)
+ {
+ if (index < 0)
+ throw new IllegalArgumentException("index less than zero");
+
+ getPopupMenu().insert(item, index);
+ return item;
+ }
+
+ /**
+ * Creates JMenuItem with the associated action and inserts it to the menu
+ * at the specified index. IllegalArgumentException is thrown
+ * if index is less than 0
+ *
+ * @param action Action for the new menu item
+ * @param index index at which to insert newly created menu item.
+ * @return Menu item that was added to the menu
+ */
+ public JMenuItem insert(Action action, int index)
+ {
+ JMenuItem item = new JMenuItem(action);
+ this.insert(item, index);
+
+ return item;
+ }
+
+ /**
+ * This method sets this menuItem's UI to the UIManager's default for the
+ * current look and feel.
+ */
+ public void updateUI()
+ {
+ setUI((MenuItemUI) UIManager.getUI(this));
+ }
+
+ /**
+ * This method returns a name to identify which look and feel class will be
+ * the UI delegate for the menu.
+ *
+ * @return The Look and Feel classID. "MenuUI"
+ */
+ public String getUIClassID()
+ {
+ return "MenuUI";
+ }
+
+ /**
+ * Sets model for this menu.
+ *
+ * @param model model to set
+ */
+ public void setModel(ButtonModel model)
+ {
+ ButtonModel oldModel = getModel();
+ if (oldModel != null && menuChangeListener != null)
+ oldModel.removeChangeListener(menuChangeListener);
+
+ super.setModel(model);
+
+ if (model != null)
+ {
+ if (menuChangeListener == null)
+ menuChangeListener = new MenuChangeListener();
+ model.addChangeListener(menuChangeListener);
+ }
+ }
+
+ /**
+ * Returns true if the menu is selected and false otherwise
+ *
+ * @return true if the menu is selected and false otherwise
+ */
+ public boolean isSelected()
+ {
+ return super.isSelected();
+ }
+
+ /**
+ * Changes this menu selected state if selected is true and false otherwise
+ * This method fires menuEvents to menu's registered listeners.
+ *
+ * @param selected true if the menu should be selected and false otherwise
+ */
+ public void setSelected(boolean selected)
+ {
+ ButtonModel m = getModel();
+ if (selected != m.isSelected())
+ m.setSelected(selected);
+ }
+
+ /**
+ * Checks if PopupMenu associated with this menu is visible
+ *
+ * @return true if the popup associated with this menu is currently visible
+ * on the screen and false otherwise.
+ */
+ public boolean isPopupMenuVisible()
+ {
+ return getPopupMenu().isVisible();
+ }
+
+ /**
+ * Sets popup menu visibility
+ *
+ * @param popup true if popup should be visible and false otherwise
+ */
+ public void setPopupMenuVisible(boolean popup)
+ {
+ if (popup != isPopupMenuVisible() && (isEnabled() || ! popup))
+ {
+ if (popup && isShowing())
+ {
+ // Set location as determined by getPopupLocation().
+ Point loc = menuLocation == null ? getPopupMenuOrigin()
+ : menuLocation;
+ getPopupMenu().show(this, loc.x, loc.y);
+ }
+ else
+ getPopupMenu().setVisible(false);
+ }
+ }
+
+ /**
+ * Returns origin point of the popup menu. This takes the screen bounds
+ * into account and places the popup where it fits best.
+ *
+ * @return the origin of the popup menu
+ */
+ protected Point getPopupMenuOrigin()
+ {
+ // The menu's screen location and size.
+ Point screenLoc = getLocationOnScreen();
+ Dimension size = getSize();
+
+ // Determine the popup's size.
+ JPopupMenu popup = getPopupMenu();
+ Dimension popupSize = popup.getSize();
+ if (popupSize.width == 0 || popupSize.height == 0)
+ popupSize = popup.getPreferredSize();
+
+ // Determine screen bounds.
+ Toolkit tk = Toolkit.getDefaultToolkit();
+ Rectangle screenBounds = new Rectangle(tk.getScreenSize());
+ GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
+ GraphicsDevice gd = ge.getDefaultScreenDevice();
+ GraphicsConfiguration gc = gd.getDefaultConfiguration();
+ Insets screenInsets = tk.getScreenInsets(gc);
+ screenBounds.x -= screenInsets.left;
+ screenBounds.width -= screenInsets.left + screenInsets.right;
+ screenBounds.y -= screenInsets.top;
+ screenBounds.height -= screenInsets.top + screenInsets.bottom;
+ screenLoc.x -= screenInsets.left;
+ screenLoc.y -= screenInsets.top;
+
+ Point point = new Point();
+ if (isTopLevelMenu())
+ {
+ // If menu in the menu bar.
+ int xOffset = UIManager.getInt("Menu.menuPopupOffsetX");
+ int yOffset = UIManager.getInt("Menu.menuPopupOffsetY");
+ // Determine X location.
+ if (getComponentOrientation().isLeftToRight())
+ {
+ // Prefer popup to the right.
+ point.x = xOffset;
+ // Check if it fits, otherwise place popup wherever it fits.
+ if (screenLoc.x + point.x + popupSize.width
+ > screenBounds.width + screenBounds.width
+ && screenBounds.width - size.width
+ < 2 * (screenLoc.x - screenBounds.x))
+ // Popup to the right if there's not enough room.
+ point.x = size.width - xOffset - popupSize.width;
+ }
+ else
+ {
+ // Prefer popup to the left.
+ point.x = size.width - xOffset - popupSize.width;
+ if (screenLoc.x + point.x < screenBounds.x
+ && screenBounds.width - size.width
+ > 2 * (screenLoc.x - screenBounds.x))
+ // Popup to the left if there's not enough room.
+ point.x = xOffset;
+ }
+ // Determine Y location. Prefer popping down.
+ point.y = size.height + yOffset;
+ if (screenLoc.y + point.y + popupSize.height >= screenBounds.height
+ && screenBounds.height - size.height
+ < 2 * (screenLoc.y - screenBounds.y))
+ // Position above if there's not enough room below.
+ point.y = - yOffset - popupSize.height;
+ }
+ else
+ {
+ // If submenu.
+ int xOffset = UIManager.getInt("Menu.submenuPopupOffsetX");
+ int yOffset = UIManager.getInt("Menu.submenuPopupOffsetY");
+ // Determine X location.
+ if (getComponentOrientation().isLeftToRight())
+ {
+ // Prefer popup to the right.
+ point.x = size.width + xOffset;
+ if (screenLoc.x + point.x + popupSize.width
+ >= screenBounds.x + screenBounds.width
+ && screenBounds.width - size.width
+ < 2 * (screenLoc.x - screenBounds.x))
+ // Position to the left if there's not enough room on the right.
+ point.x = - xOffset - popupSize.width;
+ }
+ else
+ {
+ // Prefer popup on the left side.
+ point.x = - xOffset - popupSize.width;
+ if (screenLoc.x + point.x < screenBounds.x
+ && screenBounds.width - size.width
+ > 2 * (screenLoc.x - screenBounds.x))
+ // Popup to the right if there's not enough room.
+ point.x = size.width + xOffset;
+ }
+ // Determine Y location. Prefer popping down.
+ point.y = yOffset;
+ if (screenLoc.y + point.y + popupSize.height
+ >= screenBounds.y + screenBounds.height
+ && screenBounds.height - size.height
+ < 2 * (screenLoc.y - screenBounds.y))
+ // Pop up if there's not enough room below.
+ point.y = size.height - yOffset - popupSize.height;
+ }
+ return point;
+ }
+
+ /**
+ * Returns delay property.
+ *
+ * @return delay property, indicating number of milliseconds before
+ * popup menu associated with the menu appears or disappears after
+ * menu was selected or deselected respectively
+ */
+ public int getDelay()
+ {
+ return delay;
+ }
+
+ /**
+ * Sets delay property for this menu. If given time for the delay
+ * property is negative, then IllegalArgumentException is thrown
+ *
+ * @param delay number of milliseconds before
+ * popup menu associated with the menu appears or disappears after
+ * menu was selected or deselected respectively
+ */
+ public void setDelay(int delay)
+ {
+ if (delay < 0)
+ throw new IllegalArgumentException("delay less than 0");
+ this.delay = delay;
+ }
+
+ /**
+ * Sets location at which popup menu should be displayed
+ * The location given is relative to this menu item
+ *
+ * @param x x-coordinate of the menu location
+ * @param y y-coordinate of the menu location
+ */
+ public void setMenuLocation(int x, int y)
+ {
+ menuLocation = new Point(x, y);
+ if (popupMenu != null)
+ popupMenu.setLocation(x, y);
+ }
+
+ /**
+ * Creates and returns JMenuItem associated with the given action
+ *
+ * @param action Action to use for creation of JMenuItem
+ *
+ * @return JMenuItem that was creted with given action
+ */
+ protected JMenuItem createActionComponent(Action action)
+ {
+ return new JMenuItem(action);
+ }
+
+ /**
+ * Creates ActionChangeListener to listen for PropertyChangeEvents occuring
+ * in the action that is associated with this menu
+ *
+ * @param item menu that contains action to listen to
+ *
+ * @return The PropertyChangeListener
+ */
+ protected PropertyChangeListener createActionChangeListener(JMenuItem item)
+ {
+ return new ActionChangedListener(item);
+ }
+
+ /**
+ * Adds separator to the end of the menu items in the menu.
+ */
+ public void addSeparator()
+ {
+ getPopupMenu().addSeparator();
+ }
+
+ /**
+ * Inserts separator in the menu at the specified index.
+ *
+ * @param index Index at which separator should be inserted
+ */
+ public void insertSeparator(int index)
+ {
+ if (index < 0)
+ throw new IllegalArgumentException("index less than 0");
+
+ getPopupMenu().insert(new JPopupMenu.Separator(), index);
+ }
+
+ /**
+ * Returns menu item located at the specified index in the menu
+ *
+ * @param index Index at which to look for the menu item
+ *
+ * @return menu item located at the specified index in the menu
+ */
+ public JMenuItem getItem(int index)
+ {
+ if (index < 0)
+ throw new IllegalArgumentException("index less than 0");
+
+ if (getItemCount() == 0)
+ return null;
+
+ Component c = popupMenu.getComponentAtIndex(index);
+
+ if (c instanceof JMenuItem)
+ return (JMenuItem) c;
+ else
+ return null;
+ }
+
+ /**
+ * Returns number of items in the menu including separators.
+ *
+ * @return number of items in the menu
+ *
+ * @see #getMenuComponentCount()
+ */
+ public int getItemCount()
+ {
+ return getMenuComponentCount();
+ }
+
+ /**
+ * Checks if this menu is a tear-off menu.
+ *
+ * @return true if this menu is a tear-off menu and false otherwise
+ */
+ public boolean isTearOff()
+ {
+ // NOT YET IMPLEMENTED
+ throw new Error("The method isTearOff() has not yet been implemented.");
+ }
+
+ /**
+ * Returns number of menu components in this menu
+ *
+ * @return number of menu components in this menu
+ */
+ public int getMenuComponentCount()
+ {
+ return getPopupMenu().getComponentCount();
+ }
+
+ /**
+ * Returns menu component located at the givent index
+ * in the menu
+ *
+ * @param index index at which to get the menu component in the menu
+ *
+ * @return Menu Component located in the menu at the specified index
+ */
+ public Component getMenuComponent(int index)
+ {
+ if (getPopupMenu() == null || getMenuComponentCount() == 0)
+ return null;
+
+ return popupMenu.getComponentAtIndex(index);
+ }
+
+ /**
+ * Return components belonging to this menu
+ *
+ * @return components belonging to this menu
+ */
+ public Component[] getMenuComponents()
+ {
+ return getPopupMenu().getComponents();
+ }
+
+ /**
+ * Checks if this menu is a top level menu. The menu is top
+ * level menu if it is inside the menu bar. While if the menu
+ * inside some other menu, it is considered to be a pull-right menu.
+ *
+ * @return true if this menu is top level menu, and false otherwise
+ */
+ public boolean isTopLevelMenu()
+ {
+ return getParent() instanceof JMenuBar;
+ }
+
+ /**
+ * Checks if given component exists in this menu. The submenus of
+ * this menu are checked as well
+ *
+ * @param component Component to look for
+ *
+ * @return true if the given component exists in this menu, and false otherwise
+ */
+ public boolean isMenuComponent(Component component)
+ {
+ return false;
+ }
+
+ /**
+ * Returns popup menu associated with the menu.
+ *
+ * @return popup menu associated with the menu.
+ */
+ public JPopupMenu getPopupMenu()
+ {
+ if (popupMenu == null)
+ {
+ popupMenu = new JPopupMenu();
+ popupMenu.setInvoker(this);
+ }
+ return popupMenu;
+ }
+
+ /**
+ * Adds MenuListener to the menu
+ *
+ * @param listener MenuListener to add
+ */
+ public void addMenuListener(MenuListener listener)
+ {
+ listenerList.add(MenuListener.class, listener);
+ }
+
+ /**
+ * Removes MenuListener from the menu
+ *
+ * @param listener MenuListener to remove
+ */
+ public void removeMenuListener(MenuListener listener)
+ {
+ listenerList.remove(MenuListener.class, listener);
+ }
+
+ /**
+ * Returns all registered <code>MenuListener</code> objects.
+ *
+ * @return an array of listeners
+ *
+ * @since 1.4
+ */
+ public MenuListener[] getMenuListeners()
+ {
+ return (MenuListener[]) listenerList.getListeners(MenuListener.class);
+ }
+
+ /**
+ * This method fires MenuEvents to all menu's MenuListeners. In this case
+ * menuSelected() method of MenuListeners is called to indicated that the menu
+ * was selected.
+ */
+ protected void fireMenuSelected()
+ {
+ MenuListener[] listeners = getMenuListeners();
+
+ for (int index = 0; index < listeners.length; ++index)
+ listeners[index].menuSelected(menuEvent);
+ }
+
+ /**
+ * This method fires MenuEvents to all menu's MenuListeners. In this case
+ * menuDeselected() method of MenuListeners is called to indicated that the menu
+ * was deselected.
+ */
+ protected void fireMenuDeselected()
+ {
+ EventListener[] ll = listenerList.getListeners(MenuListener.class);
+
+ for (int i = 0; i < ll.length; i++)
+ ((MenuListener) ll[i]).menuDeselected(menuEvent);
+ }
+
+ /**
+ * This method fires MenuEvents to all menu's MenuListeners. In this case
+ * menuSelected() method of MenuListeners is called to indicated that the menu
+ * was cancelled. The menu is cancelled when it's popup menu is close without selection.
+ */
+ protected void fireMenuCanceled()
+ {
+ EventListener[] ll = listenerList.getListeners(MenuListener.class);
+
+ for (int i = 0; i < ll.length; i++)
+ ((MenuListener) ll[i]).menuCanceled(menuEvent);
+ }
+
+ /**
+ * Creates WinListener that listens to the menu;s popup menu.
+ *
+ * @param popup JPopupMenu to listen to
+ *
+ * @return The WinListener
+ */
+ protected WinListener createWinListener(JPopupMenu popup)
+ {
+ return new WinListener(popup);
+ }
+
+ /**
+ * Method of the MenuElementInterface. It reacts to the selection
+ * changes in the menu. If this menu was selected, then it
+ * displayes popup menu associated with it and if this menu was
+ * deselected it hides the popup menu.
+ *
+ * @param changed true if the menu was selected and false otherwise
+ */
+ public void menuSelectionChanged(boolean changed)
+ {
+ // if this menu selection is true, then activate this menu and
+ // display popup associated with this menu
+ setSelected(changed);
+ }
+
+ /**
+ * Method of MenuElement interface. Returns sub components of
+ * this menu.
+ *
+ * @return array containing popupMenu that is associated with this menu
+ */
+ public MenuElement[] getSubElements()
+ {
+ return new MenuElement[] { popupMenu };
+ }
+
+ /**
+ * @return Returns reference to itself
+ */
+ public Component getComponent()
+ {
+ return this;
+ }
+
+ /**
+ * This method is overriden with empty implementation, s.t the
+ * accelerator couldn't be set for the menu. The mnemonic should
+ * be used for the menu instead.
+ *
+ * @param keystroke accelerator for this menu
+ */
+ public void setAccelerator(KeyStroke keystroke)
+ {
+ throw new Error("setAccelerator() is not defined for JMenu. Use setMnemonic() instead.");
+ }
+
+ /**
+ * This method process KeyEvent occuring when the menu is visible
+ *
+ * @param event The KeyEvent
+ */
+ protected void processKeyEvent(KeyEvent event)
+ {
+ MenuSelectionManager.defaultManager().processKeyEvent(event);
+ }
+
+ /**
+ * Programatically performs click
+ *
+ * @param time Number of milliseconds for which this menu stays pressed
+ */
+ public void doClick(int time)
+ {
+ getModel().setArmed(true);
+ getModel().setPressed(true);
+ try
+ {
+ java.lang.Thread.sleep(time);
+ }
+ catch (java.lang.InterruptedException e)
+ {
+ // probably harmless
+ }
+
+ getModel().setPressed(false);
+ getModel().setArmed(false);
+ popupMenu.show(this, this.getWidth(), 0);
+ }
+
+ /**
+ * A string that describes this JMenu. Normally only used
+ * for debugging.
+ *
+ * @return A string describing this JMenu
+ */
+ protected String paramString()
+ {
+ return super.paramString();
+ }
+
+ public AccessibleContext getAccessibleContext()
+ {
+ if (accessibleContext == null)
+ accessibleContext = new AccessibleJMenu();
+
+ return accessibleContext;
+ }
+
+ /**
+ * Implements support for assisitive technologies for <code>JMenu</code>.
+ */
+ protected class AccessibleJMenu extends AccessibleJMenuItem
+ implements AccessibleSelection
+ {
+ private static final long serialVersionUID = -8131864021059524309L;
+
+ protected AccessibleJMenu()
+ {
+ // Nothing to do here.
+ }
+
+ /**
+ * Returns the number of accessible children of this object.
+ *
+ * @return the number of accessible children of this object
+ */
+ public int getAccessibleChildrenCount()
+ {
+ Component[] children = getMenuComponents();
+ int count = 0;
+ for (int i = 0; i < children.length; i++)
+ {
+ if (children[i] instanceof Accessible)
+ count++;
+ }
+ return count;
+ }
+
+ /**
+ * Returns the accessible child with the specified <code>index</code>.
+ *
+ * @param index the index of the child to fetch
+ *
+ * @return the accessible child with the specified <code>index</code>
+ */
+ public Accessible getAccessibleChild(int index)
+ {
+ Component[] children = getMenuComponents();
+ int count = 0;
+ Accessible found = null;
+ for (int i = 0; i < children.length; i++)
+ {
+ if (children[i] instanceof Accessible)
+ {
+ if (count == index)
+ {
+ found = (Accessible) children[i];
+ break;
+ }
+ count++;
+ }
+ }
+ return found;
+ }
+
+ /**
+ * Returns the accessible selection of this object. AccessibleJMenus handle
+ * their selection themselves, so we always return <code>this</code> here.
+ *
+ * @return the accessible selection of this object
+ */
+ public AccessibleSelection getAccessibleSelection()
+ {
+ return this;
+ }
+
+ /**
+ * Returns the selected accessible child with the specified
+ * <code>index</code>.
+ *
+ * @param index the index of the accessible selected child to return
+ *
+ * @return the selected accessible child with the specified
+ * <code>index</code>
+ */
+ public Accessible getAccessibleSelection(int index)
+ {
+ Accessible selected = null;
+ // Only one item can be selected, which must therefore have index == 0.
+ if (index == 0)
+ {
+ MenuSelectionManager msm = MenuSelectionManager.defaultManager();
+ MenuElement[] me = msm.getSelectedPath();
+ if (me != null)
+ {
+ for (int i = 0; i < me.length; i++)
+ {
+ if (me[i] == JMenu.this)
+ {
+ // This JMenu is selected, find and return the next
+ // JMenuItem in the path.
+ do
+ {
+ if (me[i] instanceof Accessible)
+ {
+ selected = (Accessible) me[i];
+ break;
+ }
+ i++;
+ } while (i < me.length);
+ }
+ if (selected != null)
+ break;
+ }
+ }
+ }
+ return selected;
+ }
+
+ /**
+ * Returns <code>true</code> if the accessible child with the specified
+ * index is selected, <code>false</code> otherwise.
+ *
+ * @param index the index of the accessible child to check
+ *
+ * @return <code>true</code> if the accessible child with the specified
+ * index is selected, <code>false</code> otherwise
+ */
+ public boolean isAccessibleChildSelected(int index)
+ {
+ boolean selected = false;
+ MenuSelectionManager msm = MenuSelectionManager.defaultManager();
+ MenuElement[] me = msm.getSelectedPath();
+ if (me != null)
+ {
+ Accessible toBeFound = getAccessibleChild(index);
+ for (int i = 0; i < me.length; i++)
+ {
+ if (me[i] == toBeFound)
+ {
+ selected = true;
+ break;
+ }
+ }
+ }
+ return selected;
+ }
+
+ /**
+ * Returns the accessible role of this object, which is
+ * {@link AccessibleRole#MENU} for the AccessibleJMenu.
+ *
+ * @return the accessible role of this object
+ */
+ public AccessibleRole getAccessibleRole()
+ {
+ return AccessibleRole.MENU;
+ }
+
+ /**
+ * Returns the number of selected accessible children. This will be
+ * <code>0</code> if no item is selected, or <code>1</code> if an item
+ * is selected. AccessibleJMenu can have maximum 1 selected item.
+ *
+ * @return the number of selected accessible children
+ */
+ public int getAccessibleSelectionCount()
+ {
+ int count = 0;
+ MenuSelectionManager msm = MenuSelectionManager.defaultManager();
+ MenuElement[] me = msm.getSelectedPath();
+ if (me != null)
+ {
+ for (int i = 0; i < me.length; i++)
+ {
+ if (me[i] == JMenu.this)
+ {
+ if (i + 1 < me.length)
+ {
+ count = 1;
+ break;
+ }
+ }
+ }
+ }
+ return count;
+ }
+
+ /**
+ * Selects the accessible child with the specified index.
+ *
+ * @param index the index of the accessible child to select
+ */
+ public void addAccessibleSelection(int index)
+ {
+ Accessible child = getAccessibleChild(index);
+ if (child != null && child instanceof JMenuItem)
+ {
+ JMenuItem mi = (JMenuItem) child;
+ MenuSelectionManager msm = MenuSelectionManager.defaultManager();
+ msm.setSelectedPath(createPath(JMenu.this));
+ }
+ }
+
+ /**
+ * Removes the item with the specified index from the selection.
+ *
+ * @param index the index of the selected item to remove from the selection
+ */
+ public void removeAccessibleSelection(int index)
+ {
+ Accessible child = getAccessibleChild(index);
+ if (child != null)
+ {
+ MenuSelectionManager msm = MenuSelectionManager.defaultManager();
+ MenuElement[] oldSelection = msm.getSelectedPath();
+ for (int i = 0; i < oldSelection.length; i++)
+ {
+ if (oldSelection[i] == child)
+ {
+ // Found the specified child in the selection. Remove it
+ // from the selection.
+ MenuElement[] newSel = new MenuElement[i - 1];
+ System.arraycopy(oldSelection, 0, newSel, 0, i - 1);
+ msm.setSelectedPath(newSel);
+ break;
+ }
+ }
+ }
+ }
+
+ /**
+ * Removes all possibly selected accessible children of this object from
+ * the selection.
+ */
+ public void clearAccessibleSelection()
+ {
+ MenuSelectionManager msm = MenuSelectionManager.defaultManager();
+ MenuElement[] oldSelection = msm.getSelectedPath();
+ for (int i = 0; i < oldSelection.length; i++)
+ {
+ if (oldSelection[i] == JMenu.this)
+ {
+ // Found this menu in the selection. Remove all children from
+ // the selection.
+ MenuElement[] newSel = new MenuElement[i];
+ System.arraycopy(oldSelection, 0, newSel, 0, i);
+ msm.setSelectedPath(newSel);
+ break;
+ }
+ }
+ }
+
+ /**
+ * AccessibleJMenu don't support multiple selection, so this method
+ * does nothing.
+ */
+ public void selectAllAccessibleSelection()
+ {
+ // Nothing to do here.
+ }
+ }
+
+ protected class WinListener extends WindowAdapter implements Serializable
+ {
+ private static final long serialVersionUID = -6415815570638474823L;
+
+ /**
+ * Creates a new <code>WinListener</code>.
+ *
+ * @param popup the popup menu which is observed
+ */
+ public WinListener(JPopupMenu popup)
+ {
+ // TODO: What should we do with the popup argument?
+ }
+
+ /**
+ * Receives notification when the popup menu is closing and deselects
+ * the menu.
+ *
+ * @param event the window event
+ */
+ public void windowClosing(WindowEvent event)
+ {
+ setSelected(false);
+ }
+ }
+
+ /**
+ * This class listens to PropertyChangeEvents occuring in menu's action
+ */
+ private class ActionChangedListener implements PropertyChangeListener
+ {
+ /** menu item associated with the action */
+ private JMenuItem menuItem;
+
+ /** Creates new ActionChangedListener and adds it to menuItem's action */
+ public ActionChangedListener(JMenuItem menuItem)
+ {
+ this.menuItem = menuItem;
+
+ Action a = menuItem.getAction();
+ if (a != null)
+ a.addPropertyChangeListener(this);
+ }
+
+ /**This method is invoked when some change occures in menuItem's action*/
+ public void propertyChange(PropertyChangeEvent evt)
+ {
+ // FIXME: Need to implement
+ }
+ }
+
+ /**
+ * Creates an array to be feeded as argument to
+ * {@link MenuSelectionManager#setSelectedPath(MenuElement[])} for the
+ * specified element. This has the effect of selecting the specified element
+ * and all its parents.
+ *
+ * @param leaf the leaf element for which to create the selected path
+ *
+ * @return the selected path array
+ */
+ MenuElement[] createPath(JMenu leaf)
+ {
+ ArrayList path = new ArrayList();
+ MenuElement[] array = null;
+ Component current = leaf.getPopupMenu();
+ while (true)
+ {
+ if (current instanceof JPopupMenu)
+ {
+ JPopupMenu popupMenu = (JPopupMenu) current;
+ path.add(0, popupMenu);
+ current = popupMenu.getInvoker();
+ }
+ else if (current instanceof JMenu)
+ {
+ JMenu menu = (JMenu) current;
+ path.add(0, menu);
+ current = menu.getParent();
+ }
+ else if (current instanceof JMenuBar)
+ {
+ JMenuBar menuBar = (JMenuBar) current;
+ path.add(0, menuBar);
+ array = new MenuElement[path.size()];
+ array = (MenuElement[]) path.toArray(array);
+ break;
+ }
+ }
+ return array;
+ }
+}