mirror of git://gcc.gnu.org/git/gcc.git
470 lines
13 KiB
Java
470 lines
13 KiB
Java
/* JMenuBar.java --
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Copyright (C) 2002, 2004 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package javax.swing;
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import java.awt.Component;
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import java.awt.Graphics;
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import java.awt.Insets;
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import java.awt.event.KeyEvent;
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import java.awt.event.MouseEvent;
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import javax.accessibility.Accessible;
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import javax.accessibility.AccessibleContext;
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import javax.swing.plaf.MenuBarUI;
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/**
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* <p>
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* JMenuBar is a container for menu's. For a menu bar to be seen on the
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* screen, at least one menu should be added to it. Just like adding
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* components to container, one can use add() to add menu's to the menu bar.
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* Menu's will be displayed in the menu bar in the order they were added.
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* The JMenuBar uses selectionModel to keep track of selected menu index.
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* JMenuBar's selectionModel will fire ChangeEvents to its registered
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* listeners when the selected index changes.
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* </p>
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*/
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public class JMenuBar extends JComponent implements Accessible, MenuElement
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{
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/** Fired in a PropertyChangeEvent when the "borderPainted" property changes. */
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public static final String BORDER_PAINTED_CHANGED_PROPERTY = "borderPainted";
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/** Fired in a PropertyChangeEvent when the "model" changes. */
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public static final String MODEL_CHANGED_PROPERTY = "model";
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/** Fired in a PropertyChangeEvent when the "margin" changes. */
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public static final String MARGIN_CHANGED_PROPERTY = "margin";
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private static final long serialVersionUID = -8191026883931977036L;
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/** JMenuBar's model. It keeps track of selected menu's index */
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private transient SingleSelectionModel selectionModel;
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/* borderPainted property indicating if the menuBar's border will be painted*/
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private boolean borderPainted;
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/* margin between menu bar's border and its menues*/
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private Insets margin;
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/**
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* Creates a new JMenuBar object.
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*/
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public JMenuBar()
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{
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selectionModel = new DefaultSingleSelectionModel();
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borderPainted = true;
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updateUI();
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}
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/**
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* Adds menu to the menu bar
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*
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* @param c menu to add
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*
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* @return reference to the added menu
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*/
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public JMenu add(JMenu c)
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{
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c.setAlignmentX(Component.LEFT_ALIGNMENT);
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super.add(c);
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return c;
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}
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/**
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* This method overrides addNotify() in the Container to register
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* this menu bar with the current keyboard manager.
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*/
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public void addNotify()
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{
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// FIXME: Should register this menu bar with the keyboard manager
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super.addNotify();
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}
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public AccessibleContext getAccessibleContext()
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{
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return null;
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}
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/**
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* Returns reference to this menu bar
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*
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* @return reference to this menu bar
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*/
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public Component getComponent()
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{
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return this;
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}
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/**
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* Returns component at the specified index.
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*
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* @param i index of the component to get
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*
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* @return component at the specified index. Null is returned if
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* component at the specified index doesn't exist.
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* @deprecated Replaced by getComponent(int)
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*/
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public Component getComponentAtIndex(int i)
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{
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return getComponent(i);
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}
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/**
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* Returns index of the specified component
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*
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* @param c Component to search for
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*
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* @return index of the specified component. -1 is returned if
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* specified component doesnt' exist in the menu bar.
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*/
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public int getComponentIndex(Component c)
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{
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Component[] comps = getComponents();
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int index = -1;
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for (int i = 0; i < comps.length; i++)
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{
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if (comps[i].equals(c))
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{
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index = i;
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break;
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}
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}
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return index;
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}
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/**
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* DOCUMENT ME!
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*
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* @return DOCUMENT ME!
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*/
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public JMenu getHelpMenu()
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{
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return null;
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}
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/**
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* Returns margin betweeen menu bar's border and its menues
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*
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* @return margin between menu bar's border and its menues
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*/
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public Insets getMargin()
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{
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if (margin == null)
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return new Insets(0, 0, 0, 0);
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else
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return margin;
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}
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/**
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* Return menu at the specified index. If component at the
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* specified index is not a menu, then null is returned.
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*
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* @param index index to look for the menu
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*
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* @return menu at specified index, or null if menu doesn't exist
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* at the specified index.
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*/
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public JMenu getMenu(int index)
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{
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if (getComponentAtIndex(index) instanceof JMenu)
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return (JMenu) getComponentAtIndex(index);
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else
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return null;
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}
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/**
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* Returns number of menu's in this menu bar
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*
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* @return number of menu's in this menu bar
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*/
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public int getMenuCount()
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{
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return getComponentCount();
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}
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/**
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* Returns selection model for this menu bar. SelectionModel
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* keeps track of the selected menu in the menu bar. Whenever
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* selected property of selectionModel changes, the ChangeEvent
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* will be fired its ChangeListeners.
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*
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* @return selection model for this menu bar.
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*/
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public SingleSelectionModel getSelectionModel()
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{
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return selectionModel;
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}
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/**
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* Method of MenuElement interface. It returns subcomponents
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* of the menu bar, which are all the menues that it contains.
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*
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* @return MenuElement[] array containing menues in this menu bar
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*/
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public MenuElement[] getSubElements()
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{
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MenuElement[] subElements = new MenuElement[getComponentCount()];
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for (int i = 0; i < getComponentCount(); i++)
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subElements[i] = (MenuElement) getMenu(i);
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return subElements;
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}
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/**
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* Set the "UI" property of the menu bar, which is a look and feel class
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* responsible for handling the menuBar's input events and painting it.
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*
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* @return The current "UI" property
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*/
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public MenuBarUI getUI()
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{
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return (MenuBarUI) ui;
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}
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/**
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* This method returns a name to identify which look and feel class will be
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* the UI delegate for the menu bar.
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*
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* @return The Look and Feel classID. "MenuItemUI"
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*/
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public String getUIClassID()
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{
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return "MenuBarUI";
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}
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/**
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* Returns true if menu bar paints its border and false otherwise
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*
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* @return true if menu bar paints its border and false otherwise
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*/
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public boolean isBorderPainted()
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{
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return borderPainted;
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}
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/**
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* Returns true if some menu in menu bar is selected.
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*
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* @return true if some menu in menu bar is selected and false otherwise
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*/
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public boolean isSelected()
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{
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return selectionModel.isSelected();
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}
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/**
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* This method does nothing by default. This method is need for the
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* MenuElement interface to be implemented.
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*
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* @param isIncluded true if menuBar is included in the selection
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* and false otherwise
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*/
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public void menuSelectionChanged(boolean isIncluded)
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{
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// Do nothing - needed for implementation of MenuElement interface
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}
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/**
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* Paints border of the menu bar, if its borderPainted property is set to
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* true.
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*
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* @param g The graphics context with which to paint the border
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*/
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protected void paintBorder(Graphics g)
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{
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if (borderPainted)
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getBorder().paintBorder(this, g, 0, 0, getSize(null).width,
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getSize(null).height);
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}
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/**
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* A string that describes this JMenuBar. Normally only used
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* for debugging.
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*
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* @return A string describing this JMenuBar
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*/
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protected String paramString()
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{
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return "JMenuBar";
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}
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/**
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* Process key events forwarded from MenuSelectionManager. This method
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* doesn't do anything. It is here to conform to the MenuElement interface.
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*
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* @param event event forwarded from MenuSelectionManager
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* @param path path to the menu element from which event was generated
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* @param manager MenuSelectionManager for the current menu hierarchy
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*
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*/
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public void processKeyEvent(KeyEvent e, MenuElement[] path,
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MenuSelectionManager manager)
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{
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// Do nothing - needed for implementation of MenuElement interface
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}
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/**
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* Process mouse events forwarded from MenuSelectionManager. This method
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* doesn't do anything. It is here to conform to the MenuElement interface.
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*
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* @param event event forwarded from MenuSelectionManager
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* @param path path to the menu element from which event was generated
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* @param manager MenuSelectionManager for the current menu hierarchy
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*
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*/
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public void processMouseEvent(MouseEvent event, MenuElement[] path,
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MenuSelectionManager manager)
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{
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// Do nothing - needed for implementation of MenuElement interface
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}
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/**
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* This method overrides removeNotify() in the Container to
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* unregister this menu bar from the current keyboard manager.
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*/
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public void removeNotify()
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{
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// Must unregister this menu bar with the current keyboard manager.
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super.removeNotify();
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}
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/**
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* Sets painting status of the border. If 'b' is true then menu bar's
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* border will be painted, and it will not be painted otherwise.
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*
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* @param b indicates if menu bar's border should be painted.
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*/
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public void setBorderPainted(boolean b)
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{
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boolean old = borderPainted;
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borderPainted = b;
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if (b != old)
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{
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firePropertyChange(BORDER_PAINTED_CHANGED_PROPERTY, old, b);
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revalidate();
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repaint();
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}
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}
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/**
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* Sets help menu for this menu bar
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*
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* @param menu help menu
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*/
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public void setHelpMenu(JMenu menu)
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{
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}
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/**
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* Sets the menu bar's "margin" bound property, which represents
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* distance between the menubar's border and its menus.
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* icon. When marging property is modified, PropertyChangeEvent will
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* be fired to menuBar's PropertyChangeListener's.
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*
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* @param m distance between the menubar's border and its menus.
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*
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*/
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public void setMargin(Insets m)
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{
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if (m.equals(this.margin))
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{
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Insets oldMargin = this.margin;
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this.margin = m;
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firePropertyChange(MARGIN_CHANGED_PROPERTY, oldMargin, margin);
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}
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this.margin = m;
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}
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/**
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* Changes menu bar's selection to the specified menu.
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* This method updates selected index of menu bar's selection model,
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* which results in a model firing change event.
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*
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* @param sel menu to select
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*/
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public void setSelected(Component sel)
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{
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int index = getComponentIndex(sel);
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selectionModel.setSelectedIndex(index);
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}
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/**
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* Sets menuBar's selection model to the one specified
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*
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* @param model SingleSelectionModel that needs to be set for this menu bar
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*/
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public void setSelectionModel(SingleSelectionModel model)
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{
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selectionModel = model;
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if (selectionModel != model)
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{
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SingleSelectionModel oldModel = selectionModel;
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selectionModel = model;
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firePropertyChange(MODEL_CHANGED_PROPERTY, oldModel,
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this.selectionModel);
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}
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}
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/**
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* Set the "UI" property of the menu bar, which is a look and feel class
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* responsible for handling menuBar's input events and painting it.
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*
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* @param ui The new "UI" property
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*/
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public void setUI(MenuBarUI ui)
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{
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super.setUI(ui);
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}
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/**
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* Set the "UI" property to a class constructed, via the {@link
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* UIManager}, from the current look and feel.
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*/
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public void updateUI()
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{
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setUI((MenuBarUI) UIManager.getUI(this));
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invalidate();
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}
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}
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