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authortromey <tromey@138bc75d-0d04-0410-961f-82ee72b054a4>2005-07-16 00:30:23 +0000
committertromey <tromey@138bc75d-0d04-0410-961f-82ee72b054a4>2005-07-16 00:30:23 +0000
commitc8875fb97fc03779a5bba09872227b1d08e5d52a (patch)
treea0b991cf5866ae1d616639b906ac001811d74508 /libjava/classpath/javax/swing/JMenu.java
parentc40c1730800ed292b6db39a83d592476fa59623c (diff)
downloadgcc-c8875fb97fc03779a5bba09872227b1d08e5d52a.tar.gz
Initial revision
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@102074 138bc75d-0d04-0410-961f-82ee72b054a4
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+/* JMenu.java --
+ Copyright (C) 2002, 2004, 2005 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.Point;
+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.IOException;
+import java.io.ObjectOutputStream;
+import java.io.Serializable;
+import java.util.EventListener;
+
+import javax.accessibility.Accessible;
+import javax.accessibility.AccessibleContext;
+import javax.accessibility.AccessibleRole;
+import javax.accessibility.AccessibleSelection;
+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
+{
+ private static final long serialVersionUID = 4227225638931828014L;
+
+ /** A Popup menu associated with this menu, which pops up when menu is selected */
+ private JPopupMenu popupMenu = new JPopupMenu();
+
+ /** 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;
+
+ /**
+ * Creates a new JMenu object.
+ */
+ public JMenu()
+ {
+ super();
+ }
+
+ /**
+ * Creates a new <code>JMenu</code> with the specified label.
+ *
+ * @param text label for this menu
+ */
+ public JMenu(String text)
+ {
+ super(text);
+ popupMenu.setInvoker(this);
+ }
+
+ /**
+ * 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.setInvoker(this);
+ }
+
+ /**
+ * 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);
+ }
+
+ private void writeObject(ObjectOutputStream stream) throws IOException
+ {
+ }
+
+ /**
+ * 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 popupMenu.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)
+ {
+ popupMenu.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 popupMenu.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 popupMenu.add(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)
+ {
+ return popupMenu.add(action);
+ }
+
+ /**
+ * 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)
+ {
+ popupMenu.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)
+ {
+ popupMenu.remove(index);
+ }
+
+ /**
+ * Removes given component from this menu.
+ *
+ * @param component Component to remove
+ */
+ public void remove(Component component)
+ {
+ int index = popupMenu.getComponentIndex(component);
+ popupMenu.remove(index);
+ }
+
+ /**
+ * Removes all menu items from the menu
+ */
+ public void removeAll()
+ {
+ 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");
+
+ popupMenu.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()
+ {
+ super.setUI((MenuItemUI) UIManager.getUI(this));
+ invalidate();
+ }
+
+ /**
+ * 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)
+ {
+ super.setModel(model);
+ }
+
+ /**
+ * 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();
+ }
+
+ /**
+ * A helper method to handle setSelected calls from both mouse events and
+ * direct calls to setSelected. Direct calls shouldn't expand the popup
+ * menu and should select the JMenu even if it is disabled. Mouse events
+ * only select the JMenu if it is enabled and should expand the popup menu
+ * associated with this JMenu.
+ * @param selected whether or not the JMenu was selected
+ * @param menuEnabled whether or not selecting the menu is "enabled". This
+ * is always true for direct calls, and is set to isEnabled() for mouse
+ * based calls.
+ * @param showMenu whether or not to show the popup menu
+ */
+ private void setSelectedHelper(boolean selected, boolean menuEnabled, boolean showMenu)
+ {
+ // If menu is selected and enabled, activates the menu and
+ // displays associated popup.
+ if (selected && menuEnabled)
+ {
+ super.setArmed(true);
+ super.setSelected(true);
+
+ // FIXME: The popup menu should be shown on the screen after certain
+ // number of seconds pass. The 'delay' property of this menu indicates
+ // this amount of seconds. 'delay' property is 0 by default.
+ if (isShowing())
+ {
+ fireMenuSelected();
+
+ int x = 0;
+ int y = 0;
+ if (showMenu)
+ if (menuLocation == null)
+ {
+ // Calculate correct position of the popup. Note that location of the popup
+ // passed to show() should be relative to the popup's invoker
+ if (isTopLevelMenu())
+ y = this.getHeight();
+ else
+ x = this.getWidth();
+ getPopupMenu().show(this, x, y);
+ }
+ else
+ {
+ getPopupMenu().show(this, menuLocation.x, menuLocation.y);
+ }
+ }
+ }
+
+ else
+ {
+ super.setSelected(false);
+ super.setArmed(false);
+ fireMenuDeselected();
+ popupMenu.setVisible(false);
+ }
+ }
+
+ /**
+ * 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)
+ {
+ setSelectedHelper(selected, true, false);
+ }
+
+ /**
+ * 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 popupMenu.isVisible();
+ }
+
+ /**
+ * Sets popup menu visibility
+ *
+ * @param popup true if popup should be visible and false otherwise
+ */
+ public void setPopupMenuVisible(boolean popup)
+ {
+ if (getModel().isEnabled())
+ popupMenu.setVisible(popup);
+ }
+
+ /**
+ * Returns origin point of the popup menu
+ *
+ * @return Point containing
+ */
+ protected Point getPopupMenuOrigin()
+ {
+ // if menu in the menu bar
+ if (isTopLevelMenu())
+ return new Point(0, this.getHeight());
+
+ // if submenu
+ return new Point(this.getWidth(), 0);
+ }
+
+ /**
+ * 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);
+ }
+
+ /**
+ * 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");
+
+ 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
+ return false;
+ }
+
+ /**
+ * Returns number of menu components in this menu
+ *
+ * @return number of menu components in this menu
+ */
+ public int getMenuComponentCount()
+ {
+ return popupMenu.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)
+ {
+ return (Component) popupMenu.getComponentAtIndex(index);
+ }
+
+ /**
+ * Return components belonging to this menu
+ *
+ * @return components belonging to this menu
+ */
+ public Component[] getMenuComponents()
+ {
+ return popupMenu.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()
+ {
+ 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
+ setSelectedHelper(changed, isEnabled(), true);
+ }
+
+ /**
+ * 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)
+ {
+ }
+
+ /**
+ * 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;
+ }
+
+ protected class AccessibleJMenu extends AccessibleJMenuItem
+ implements AccessibleSelection
+ {
+ private static final long serialVersionUID = -8131864021059524309L;
+
+ protected AccessibleJMenu()
+ {
+ }
+
+ public int getAccessibleChildrenCount()
+ {
+ return 0;
+ }
+
+ public Accessible getAccessibleChild(int value0)
+ {
+ return null;
+ }
+
+ public AccessibleSelection getAccessibleSelection()
+ {
+ return null;
+ }
+
+ public Accessible getAccessibleSelection(int value0)
+ {
+ return null;
+ }
+
+ public boolean isAccessibleChildSelected(int value0)
+ {
+ return false;
+ }
+
+ public AccessibleRole getAccessibleRole()
+ {
+ return AccessibleRole.MENU;
+ }
+
+ public int getAccessibleSelectionCount()
+ {
+ return 0;
+ }
+
+ public void addAccessibleSelection(int value0)
+ {
+ }
+
+ public void removeAccessibleSelection(int value0)
+ {
+ }
+
+ public void clearAccessibleSelection()
+ {
+ }
+
+ public void selectAllAccessibleSelection()
+ {
+ }
+ }
+
+ protected class WinListener extends WindowAdapter implements Serializable
+ {
+ JPopupMenu popupMenu;
+ private static final long serialVersionUID = -6415815570638474823L;
+
+ public WinListener(JPopupMenu popup)
+ {
+ }
+
+ public void windowClosing(WindowEvent event)
+ {
+ }
+ }
+
+ /**
+ * This class listens to PropertyChangeEvents occuring in menu's action
+ */
+ protected 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
+ }
+ }
+
+}