home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Visual Cafe 3
/
Visual Cafe 3.ISO
/
Vcafe
/
JFC.bin
/
JMenuBar.java
< prev
next >
Wrap
Text File
|
1998-06-30
|
19KB
|
657 lines
/*
* @(#)JMenuBar.java 1.52 98/04/09
*
* Copyright (c) 1997 Sun Microsystems, Inc. All Rights Reserved.
*
* This software is the confidential and proprietary information of Sun
* Microsystems, Inc. ("Confidential Information"). You shall not
* disclose such Confidential Information and shall use it only in
* accordance with the terms of the license agreement you entered into
* with Sun.
*
* SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE
* SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
* IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
* PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR ANY DAMAGES
* SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING
* THIS SOFTWARE OR ITS DERIVATIVES.
*
*/
package com.sun.java.swing;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Insets;
import java.awt.LayoutManager;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.*;
import java.util.Vector;
import java.util.Enumeration;
import java.io.Serializable;
import java.io.ObjectOutputStream;
import java.io.ObjectInputStream;
import java.io.IOException;
import com.sun.java.swing.event.*;
import com.sun.java.swing.border.Border;
import com.sun.java.swing.plaf.*;
import com.sun.java.accessibility.*;
/**
* An implementation of a MenuBar. You add JMenu objects to the
* menu bar to construct a menu. When the user selects a JMenu
* object, its associated JPopupMenu is displayed, allowing the
* user to select one of the JMenuItems on it.
* <p>
* For the keyboard keys used by this component in the standard Look and
* Feel (L&F) renditions, see the
* <a href="doc-files/Key-Index.html#JMenuBar">JMenuBar</a> key assignments.
* <p>
* Warning: serialized objects of this class will not be compatible with
* future swing releases. The current serialization support is appropriate
* for short term storage or RMI between Swing1.0 applications. It will
* not be possible to load serialized Swing1.0 objects with future releases
* of Swing. The JDK1.2 release of Swing will be the compatibility
* baseline for the serialized form of Swing objects.
*
* @version 1.52 04/09/98
* @author Georges Saab
* @author David Karlton
* @author Arnaud Weber
* @see JMenu
* @see JPopupMenu
* @see JMenuItem
*/
public class JMenuBar extends JComponent implements Accessible,MenuElement
{
/*
* Model for the selected subcontrol
*/
private transient SingleSelectionModel selectionModel;
private boolean paintBorder = true;
private Insets margin = null;
/**
* Creates a new menu bar.
*/
public JMenuBar() {
super();
setLayout(new BoxLayout(this, BoxLayout.X_AXIS));
setSelectionModel(new DefaultSingleSelectionModel());
updateUI();
}
/**
* Returns the menubar's current UI.
* @see setUI
*/
public MenuBarUI getUI() {
return (MenuBarUI)ui;
}
/**
* Sets the L&F object that renders this component.
*
* @param ui the new MenuBarUI L&F object
* @see UIDefaults#getUI
*/
public void setUI(MenuBarUI ui) {
super.setUI(ui);
}
/**
* Notification from the UIFactory that the L&F has changed.
* Called to replace the UI with the latest version from the
* UIFactory.
*
* @see JComponent#updateUI
*/
public void updateUI() {
setUI((MenuBarUI)UIManager.getUI(this));
}
/**
* Returns the name of the L&F class that renders this component.
*
* @return "MenuBarUI"
* @see JComponent#getUIClassID
* @see UIDefaults#getUI
*/
public String getUIClassID() {
return "MenuBarUI";
}
/**
* Returns the model object that handles single selections.
*
* @return the SingleSelectionModel in use
* @see SingleSelectionModel
*/
public SingleSelectionModel getSelectionModel() {
return selectionModel;
}
/**
* Set the model object to handle single selections.
*
* @param model the SingleSelectionModel to use
* @see SingleSelectionModel
*/
public void setSelectionModel(SingleSelectionModel model) {
final JMenuBar thisMenuBar = this;
selectionModel = model;
}
/**
* Appends the specified menu to the end of the menu bar.
*
* @param c the JMenu component to add
*/
public JMenu add(JMenu c) {
Dimension size = c.getSize();
size.height = Short.MAX_VALUE;
// c.setMaximumSize(size);
super.add(c);
getUI().registerMenu(c);
return c;
}
/**
* Gets the menu at the specified position in the menu bar.
*
* @param index an int giving the position in the menu bar, where
* 0 is the first position
* @return the JMenu at that position
*/
public JMenu getMenu(int index) {
Component c = getComponentAtIndex(index);
if (c instanceof JMenu)
return (JMenu) c;
return null;
}
/**
* Returns the number of items in the menu bar.
*
* @return the number of items in the menu bar
*/
public int getMenuCount() {
return getComponentCount();
}
/**
* Removes the component at the specified index.
*
* @param index an int specifying the menu bar position, where 0 = first
*/
public void remove(int index) {
Component c = getComponent(index);
if(c instanceof JMenu)
getUI().unregisterMenu((JMenu)c);
super.remove(index);
}
/**
* Sets the help menu that appears when the user selects the
* "help" option in the menu bar.
*
* @param menu the JMenu that delivers help to the user
*/
public void setHelpMenu(JMenu menu) {
throw new Error("setHelpMenu() not yet implemented.");
}
/**
* Gets the help menu for the menu bar.
*
* @return the JMenu that delivers help to the user
*/
public JMenu getHelpMenu() {
throw new Error("getHelpMenu() not yet implemented.");
}
/**
* Returns the component at the specified index.
*
* @param i an int specifying the position, where 0 = first
* @return the Component at the position, or null for an
* invalid index
*/
public Component getComponentAtIndex(int i) {
int ncomponents = this.getComponentCount();
if (i <= ncomponents) {
Component[] component = this.getComponents();
return component[i];
}
return null;
}
/**
* Returns the index of the specified component.
*
* @param c the Component to find
* @return an int giving the component's position, where 0 = first
*/
public int getComponentIndex(Component c) {
int ncomponents = this.getComponentCount();
Component[] component = this.getComponents();
for (int i = 0 ; i < ncomponents ; i++) {
Component comp = component[i];
if (comp == c)
return i;
}
return -1;
}
/**
* Sets the currently selected component, producing a
* a change to the selection model.
*
* @param sel the Component to select
*/
public void setSelected(Component sel) {
SingleSelectionModel model = getSelectionModel();
int index = getComponentIndex(sel);
model.setSelectedIndex(index);
}
/**
* Returns true if the MenuBar currently has a component selected
*
* @return true if a selection has been made, else false
*/
public boolean isSelected() {
return selectionModel.isSelected();
}
/**
* Returns true if a the Menubar's border should be painted.
*
* @return true if the border should be painted, else false
*/
public boolean isBorderPainted() {
return paintBorder;
}
/**
* Determines whether the MenuBar's current border will be painted.
*
* @param s true if the border should be painted, else false
*/
public void setBorderPainted(boolean s) {
paintBorder = s;
}
/**
* Paint the menubar's border if BorderPainted property is true.
*
* @param g the Graphics context to use for painting
* @see JComponent#paint
* @see JComponent#setBorder
*/
protected void paintBorder(Graphics g) {
if (isBorderPainted()) {
super.paintBorder(g);
}
}
/**
* Sets the margin between the menubar's border and
* its menus. Setting to null will cause the menubar to
* use the default margins.
*
* @param margin an Insets object containing the margin values
* @see Insets
*/
public void setMargin(Insets margin) {
this.margin = margin;
invalidate();
}
/**
* Returns the margin between the menubar's border and
* its menus.
*
* @return an Insets object containing the margin values
* @see Insets
*/
public Insets getMargin() {
if(margin == null) {
return new Insets(0,0,0,0);
} else {
return margin;
}
}
/**
* Implemented to be a MenuElement -- does nothing.
*
* @see #getSubElements
*/
public void processMouseEvent(MouseEvent event,MenuElement path[],MenuSelectionManager manager) {
}
/**
* Implemented to be a MenuElement -- does nothing.
*
* @see #getSubElements
*/
public void processKeyEvent(KeyEvent e,MenuElement path[],MenuSelectionManager manager) {
}
/**
* Implemented to be a MenuElement -- does nothing.
*
* @see #getSubElements
*/
public void menuSelectionChanged(boolean isIncluded) {
}
/**
* Implemented to be a MenuElement -- returns the menus in this menu
* bar. This is the reason for implementing the MenuElement
* interface -- so that the menu bar can be treated the same as
* other menu elements.
*/
public MenuElement[] getSubElements() {
int menuCount = getMenuCount();
int i;
MenuElement result[] = new MenuElement[menuCount];
for(i=0;i<menuCount;i++)
result[i] = getMenu(i);
return result;
}
/**
* Implemented to be a MenuElement. Returns this object.
*
* @return the current Component (this)
* @see #getSubElements
*/
public Component getComponent() {
return this;
}
/////////////////
// Accessibility support
////////////////
/**
* Get the AccessibleContext associated with this JComponent
*
* @return the AccessibleContext of this JComponent
*/
public AccessibleContext getAccessibleContext() {
if (accessibleContext == null) {
accessibleContext = new AccessibleJMenuBar();
}
return accessibleContext;
}
/**
* The class used to obtain the accessible role for this object.
* <p>
* Warning: serialized objects of this class will not be compatible with
* future swing releases. The current serialization support is appropriate
* for short term storage or RMI between Swing1.0 applications. It will
* not be possible to load serialized Swing1.0 objects with future releases
* of Swing. The JDK1.2 release of Swing will be the compatibility
* baseline for the serialized form of Swing objects.
*/
protected class AccessibleJMenuBar extends AccessibleJComponent
implements AccessibleSelection {
/**
* Get the accessible state set of this object.
*
* @return an instance of AccessibleState containing the current state
* of the object
*/
public AccessibleStateSet getAccessibleStateSet() {
AccessibleStateSet states = super.getAccessibleStateSet();
return states;
}
/**
* Get the role of this object.
*
* @return an instance of AccessibleRole describing the role of the
* object
*/
public AccessibleRole getAccessibleRole() {
return AccessibleRole.MENU_BAR;
}
/**
* Get the AccessibleSelection associated with this object if one
* exists. Otherwise return null.
*/
public AccessibleSelection getAccessibleSelection() {
return this;
}
/**
* Returns 1 if a menu is currently selected in this menu bar.
*
* @return 1 if a menu is currently selected, else 0
*/
public int getAccessibleSelectionCount() {
if (isSelected()) {
return 1;
} else {
return 0;
}
}
/**
* Returns the currently selected menu if one is selected,
* otherwise null.
*/
public Accessible getAccessibleSelection(int i) {
if (isSelected()) {
if (i != 0) { // single selection model for JMenuBar
return null;
}
int j = getSelectionModel().getSelectedIndex();
if (getComponentAtIndex(j) instanceof Accessible) {
return (Accessible) getComponentAtIndex(j);
}
}
return null;
}
/**
* Returns true if the current child of this object is selected.
*
* @param i the zero-based index of the child in this Accessible
* object.
* @see AccessibleContext#getAccessibleChild
*/
public boolean isAccessibleChildSelected(int i) {
return (i == getSelectionModel().getSelectedIndex());
}
/**
* Selects the nth menu in the menu bar, forcing it to
* pop up. If another menu is popped up, this will force
* it to close. If the nth menu is already selected, this
* method has no effect.
*
* @param i the zero-based index of selectable items
* @see #getAccessibleStateSet
*/
public void addAccessibleSelection(int i) {
// first close up any open menu
int j = getSelectionModel().getSelectedIndex();
if (i == j) {
return;
}
if (j >= 0 && j < getMenuCount()) {
JMenu menu = getMenu(j);
if (menu != null) {
MenuSelectionManager.defaultManager().setSelectedPath(null);
// menu.setPopupMenuVisible(false);
}
}
// now popup the new menu
getSelectionModel().setSelectedIndex(i);
JMenu menu = getMenu(i);
if (menu != null) {
MenuElement me[] = new MenuElement[3];
me[0] = JMenuBar.this;
me[1] = menu;
me[2] = menu.getPopupMenu();
MenuSelectionManager.defaultManager().setSelectedPath(me);
// menu.setPopupMenuVisible(true);
}
}
/**
* Removes the nth selected item in the object from the object's
* selection. If the nth item isn't currently selected, this
* method has no effect. Otherwise, it closes the popup menu.
*
* @param i the zero-based index of selectable items
*/
public void removeAccessibleSelection(int i) {
if (i >= 0 && i < getMenuCount()) {
JMenu menu = getMenu(i);
if (menu != null) {
MenuSelectionManager.defaultManager().setSelectedPath(null);
// menu.setPopupMenuVisible(false);
}
getSelectionModel().setSelectedIndex(-1);
}
}
/**
* Clears the selection in the object, so that nothing in the
* object is selected. This will close any open menu.
*/
public void clearAccessibleSelection() {
int i = getSelectionModel().getSelectedIndex();
if (i >= 0 && i < getMenuCount()) {
JMenu menu = getMenu(i);
if (menu != null) {
MenuSelectionManager.defaultManager().setSelectedPath(null);
// menu.setPopupMenuVisible(false);
}
}
getSelectionModel().setSelectedIndex(-1);
}
/**
* Normally causes every selected item in the object to be selected
* if the object supports multiple selections. This method
* makes no sense in a menu bar, and so does nothing.
*/
public void selectAllAccessibleSelection() {
}
} // internal class AccessibleJMenuBar
/**
* Returns true to indicate that this component manages focus
* events internally.
*
* @return true
*/
public boolean isManagingFocus() {
return true;
}
KeyboardBinding bindingForKeyStroke(KeyStroke ks,int condition) {
// Does it exist for the MenuBar?
KeyboardBinding kbb = super.bindingForKeyStroke(ks, condition);
if (kbb != null)
return kbb;
int i;
Component subComponents[];
subComponents = getComponents();
for(i=0 ; i < subComponents.length ; i++) {
// If
if(subComponents[i] instanceof JMenu) {
kbb = bindingForKeyStrokeRecursive(subComponents[i], ks, condition);
}
if (kbb != null)
return kbb;
}
return null;
}
static KeyboardBinding bindingForKeyStrokeRecursive(Component c,
KeyStroke ks,int condition) {
KeyboardBinding kbb = null;
if (c==null)
return null;
if (c instanceof JComponent) {
kbb = ((JComponent)c).bindingForKeyStroke(ks, condition);
if (kbb != null)
return kbb;
}
if (c instanceof JMenu) {
JMenu m = (JMenu)c;
int i;
Component subComponents[];
subComponents = m.getMenuComponents();
if (subComponents != null) {
for(i=0 ; i < subComponents.length ; i++) {
if(subComponents[i] instanceof JMenuItem) {
kbb = bindingForKeyStrokeRecursive(subComponents[i],
ks, condition);
}
if (kbb != null)
return kbb;
}
}
}
return kbb;
}
private void writeObject(ObjectOutputStream s) throws IOException {
s.defaultWriteObject();
Object[] kvData = new Object[4];
int n = 0;
if (selectionModel instanceof Serializable) {
kvData[n++] = "selectionModel";
kvData[n++] = selectionModel;
}
s.writeObject(kvData);
}
private void readObject(ObjectInputStream s) throws IOException, ClassNotFoundException
{
s.defaultReadObject();
Object[] kvData = (Object[])(s.readObject());
for(int i = 0; i < kvData.length; i += 2) {
if (kvData[i] == null) {
break;
}
else if (kvData[i].equals("selectionModel")) {
selectionModel = (SingleSelectionModel)kvData[i + 1];
}
}
}
}