JDK8/Java8源码在线阅读
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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package javax.swing.plaf.basic;
import sun.swing.DefaultLookup;
import sun.swing.UIAction;
import java.awt.*;
import java.awt.event.*;
import java.beans.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.plaf.*;
import javax.swing.border.*;
import java.util.Arrays;
import java.util.ArrayList;
/**
* A default L&F implementation of MenuUI. This implementation
* is a "combined" view/controller.
*
* @author Georges Saab
* @author David Karlton
* @author Arnaud Weber
*/
public class BasicMenuUI extends BasicMenuItemUI
{
protected ChangeListener changeListener;
protected MenuListener menuListener;
private int lastMnemonic = 0;
/** Uses as the parent of the windowInputMap when selected. */
private InputMap selectedWindowInputMap;
/* diagnostic aids -- should be false for production builds. */
private static final boolean TRACE = false; // trace creates and disposes
private static final boolean VERBOSE = false; // show reuse hits/misses
private static final boolean DEBUG = false; // show bad params, misc.
private static boolean crossMenuMnemonic = true;
public static ComponentUI createUI(JComponent x) {
return new BasicMenuUI();
}
static void loadActionMap(LazyActionMap map) {
BasicMenuItemUI.loadActionMap(map);
map.put(new Actions(Actions.SELECT, null, true));
}
protected void installDefaults() {
super.installDefaults();
updateDefaultBackgroundColor();
((JMenu)menuItem).setDelay(200);
crossMenuMnemonic = UIManager.getBoolean("Menu.crossMenuMnemonic");
}
protected String getPropertyPrefix() {
return "Menu";
}
protected void installListeners() {
super.installListeners();
if (changeListener == null)
changeListener = createChangeListener(menuItem);
if (changeListener != null)
menuItem.addChangeListener(changeListener);
if (menuListener == null)
menuListener = createMenuListener(menuItem);
if (menuListener != null)
((JMenu)menuItem).addMenuListener(menuListener);
}
protected void installKeyboardActions() {
super.installKeyboardActions();
updateMnemonicBinding();
}
void installLazyActionMap() {
LazyActionMap.installLazyActionMap(menuItem, BasicMenuUI.class,
getPropertyPrefix() + ".actionMap");
}
void updateMnemonicBinding() {
int mnemonic = menuItem.getModel().getMnemonic();
int[] shortcutKeys = (int[])DefaultLookup.get(menuItem, this,
"Menu.shortcutKeys");
if (shortcutKeys == null) {
shortcutKeys = new int[] {KeyEvent.ALT_MASK};
}
if (mnemonic == lastMnemonic) {
return;
}
InputMap windowInputMap = SwingUtilities.getUIInputMap(
menuItem, JComponent.WHEN_IN_FOCUSED_WINDOW);
if (lastMnemonic != 0 && windowInputMap != null) {
for (int shortcutKey : shortcutKeys) {
windowInputMap.remove(KeyStroke.getKeyStroke
(lastMnemonic, shortcutKey, false));
}
}
if (mnemonic != 0) {
if (windowInputMap == null) {
windowInputMap = createInputMap(JComponent.
WHEN_IN_FOCUSED_WINDOW);
SwingUtilities.replaceUIInputMap(menuItem, JComponent.
WHEN_IN_FOCUSED_WINDOW, windowInputMap);
}
for (int shortcutKey : shortcutKeys) {
windowInputMap.put(KeyStroke.getKeyStroke(mnemonic,
shortcutKey, false), "selectMenu");
}
}
lastMnemonic = mnemonic;
}
protected void uninstallKeyboardActions() {
super.uninstallKeyboardActions();
lastMnemonic = 0;
}
protected MouseInputListener createMouseInputListener(JComponent c) {
return getHandler();
}
protected MenuListener createMenuListener(JComponent c) {
return null;
}
protected ChangeListener createChangeListener(JComponent c) {
return null;
}
protected PropertyChangeListener createPropertyChangeListener(JComponent c) {
return getHandler();
}
BasicMenuItemUI.Handler getHandler() {
if (handler == null) {
handler = new Handler();
}
return handler;
}
protected void uninstallDefaults() {
menuItem.setArmed(false);
menuItem.setSelected(false);
menuItem.resetKeyboardActions();
super.uninstallDefaults();
}
protected void uninstallListeners() {
super.uninstallListeners();
if (changeListener != null)
menuItem.removeChangeListener(changeListener);
if (menuListener != null)
((JMenu)menuItem).removeMenuListener(menuListener);
changeListener = null;
menuListener = null;
handler = null;
}
protected MenuDragMouseListener createMenuDragMouseListener(JComponent c) {
return getHandler();
}
protected MenuKeyListener createMenuKeyListener(JComponent c) {
return (MenuKeyListener)getHandler();
}
public Dimension getMaximumSize(JComponent c) {
if (((JMenu)menuItem).isTopLevelMenu() == true) {
Dimension d = c.getPreferredSize();
return new Dimension(d.width, Short.MAX_VALUE);
}
return null;
}
protected void setupPostTimer(JMenu menu) {
Timer timer = new Timer(menu.getDelay(), new Actions(
Actions.SELECT, menu,false));
timer.setRepeats(false);
timer.start();
}
private static void appendPath(MenuElement[] path, MenuElement elem) {
MenuElement newPath[] = new MenuElement[path.length+1];
System.arraycopy(path, 0, newPath, 0, path.length);
newPath[path.length] = elem;
MenuSelectionManager.defaultManager().setSelectedPath(newPath);
}
private static class Actions extends UIAction {
private static final String SELECT = "selectMenu";
// NOTE: This will be null if the action is registered in the
// ActionMap. For the timer use it will be non-null.
private JMenu menu;
private boolean force=false;
Actions(String key, JMenu menu, boolean shouldForce) {
super(key);
this.menu = menu;
this.force = shouldForce;
}
private JMenu getMenu(ActionEvent e) {
if (e.getSource() instanceof JMenu) {
return (JMenu)e.getSource();
}
return menu;
}
public void actionPerformed(ActionEvent e) {
JMenu menu = getMenu(e);
if (!crossMenuMnemonic) {
JPopupMenu pm = BasicPopupMenuUI.getLastPopup();
if (pm != null && pm != menu.getParent()) {
return;
}
}
final MenuSelectionManager defaultManager = MenuSelectionManager.defaultManager();
if(force) {
Container cnt = menu.getParent();
if(cnt != null && cnt instanceof JMenuBar) {
MenuElement me[];
MenuElement subElements[];
subElements = menu.getPopupMenu().getSubElements();
if(subElements.length > 0) {
me = new MenuElement[4];
me[0] = (MenuElement) cnt;
me[1] = menu;
me[2] = menu.getPopupMenu();
me[3] = subElements[0];
} else {
me = new MenuElement[3];
me[0] = (MenuElement)cnt;
me[1] = menu;
me[2] = menu.getPopupMenu();
}
defaultManager.setSelectedPath(me);
}
} else {
MenuElement path[] = defaultManager.getSelectedPath();
if(path.length > 0 && path[path.length-1] == menu) {
appendPath(path, menu.getPopupMenu());
}
}
}
public boolean isEnabled(Object c) {
if (c instanceof JMenu) {
return ((JMenu)c).isEnabled();
}
return true;
}
}
/*
* Set the background color depending on whether this is a toplevel menu
* in a menubar or a submenu of another menu.
*/
private void updateDefaultBackgroundColor() {
if (!UIManager.getBoolean("Menu.useMenuBarBackgroundForTopLevel")) {
return;
}
JMenu menu = (JMenu)menuItem;
if (menu.getBackground() instanceof UIResource) {
if (menu.isTopLevelMenu()) {
menu.setBackground(UIManager.getColor("MenuBar.background"));
} else {
menu.setBackground(UIManager.getColor(getPropertyPrefix() + ".background"));
}
}
}
/**
* Instantiated and used by a menu item to handle the current menu selection
* from mouse events. A MouseInputHandler processes and forwards all mouse events
* to a shared instance of the MenuSelectionManager.
* <p>
* This class is protected so that it can be subclassed by other look and
* feels to implement their own mouse handling behavior. All overridden
* methods should call the parent methods so that the menu selection
* is correct.
*
* @see javax.swing.MenuSelectionManager
* @since 1.4
*/
protected class MouseInputHandler implements MouseInputListener {
// NOTE: This class exists only for backward compatibility. All
// its functionality has been moved into Handler. If you need to add
// new functionality add it to the Handler, but make sure this
// class calls into the Handler.
public void mouseClicked(MouseEvent e) {
getHandler().mouseClicked(e);
}
/**
* Invoked when the mouse has been clicked on the menu. This
* method clears or sets the selection path of the
* MenuSelectionManager.
*
* @param e the mouse event
*/
public void mousePressed(MouseEvent e) {
getHandler().mousePressed(e);
}
/**
* Invoked when the mouse has been released on the menu. Delegates the
* mouse event to the MenuSelectionManager.
*
* @param e the mouse event
*/
public void mouseReleased(MouseEvent e) {
getHandler().mouseReleased(e);
}
/**
* Invoked when the cursor enters the menu. This method sets the selected
* path for the MenuSelectionManager and handles the case
* in which a menu item is used to pop up an additional menu, as in a
* hierarchical menu system.
*
* @param e the mouse event; not used
*/
public void mouseEntered(MouseEvent e) {
getHandler().mouseEntered(e);
}
public void mouseExited(MouseEvent e) {
getHandler().mouseExited(e);
}
/**
* Invoked when a mouse button is pressed on the menu and then dragged.
* Delegates the mouse event to the MenuSelectionManager.
*
* @param e the mouse event
* @see java.awt.event.MouseMotionListener#mouseDragged
*/
public void mouseDragged(MouseEvent e) {
getHandler().mouseDragged(e);
}
public void mouseMoved(MouseEvent e) {
getHandler().mouseMoved(e);
}
}
/**
* As of Java 2 platform 1.4, this previously undocumented class
* is now obsolete. KeyBindings are now managed by the popup menu.
*/
public class ChangeHandler implements ChangeListener {
public JMenu menu;
public BasicMenuUI ui;
public boolean isSelected = false;
public Component wasFocused;
public ChangeHandler(JMenu m, BasicMenuUI ui) {
menu = m;
this.ui = ui;
}
public void stateChanged(ChangeEvent e) { }
}
private class Handler extends BasicMenuItemUI.Handler implements MenuKeyListener {
//
// PropertyChangeListener
//
public void propertyChange(PropertyChangeEvent e) {
if (e.getPropertyName() == AbstractButton.
MNEMONIC_CHANGED_PROPERTY) {
updateMnemonicBinding();
}
else {
if (e.getPropertyName().equals("ancestor")) {
updateDefaultBackgroundColor();
}
super.propertyChange(e);
}
}
//
// MouseInputListener
//
public void mouseClicked(MouseEvent e) {
}
/**
* Invoked when the mouse has been clicked on the menu. This
* method clears or sets the selection path of the
* MenuSelectionManager.
*
* @param e the mouse event
*/
public void mousePressed(MouseEvent e) {
JMenu menu = (JMenu)menuItem;
if (!menu.isEnabled())
return;
MenuSelectionManager manager =
MenuSelectionManager.defaultManager();
if(menu.isTopLevelMenu()) {
if(menu.isSelected() && menu.getPopupMenu().isShowing()) {
manager.clearSelectedPath();
} else {
Container cnt = menu.getParent();
if(cnt != null && cnt instanceof JMenuBar) {
MenuElement me[] = new MenuElement[2];
me[0]=(MenuElement)cnt;
me[1]=menu;
manager.setSelectedPath(me);
}
}
}
MenuElement selectedPath[] = manager.getSelectedPath();
if (selectedPath.length > 0 &&
selectedPath[selectedPath.length-1] != menu.getPopupMenu()) {
if(menu.isTopLevelMenu() ||
menu.getDelay() == 0) {
appendPath(selectedPath, menu.getPopupMenu());
} else {
setupPostTimer(menu);
}
}
}
/**
* Invoked when the mouse has been released on the menu. Delegates the
* mouse event to the MenuSelectionManager.
*
* @param e the mouse event
*/
public void mouseReleased(MouseEvent e) {
JMenu menu = (JMenu)menuItem;
if (!menu.isEnabled())
return;
MenuSelectionManager manager =
MenuSelectionManager.defaultManager();
manager.processMouseEvent(e);
if (!e.isConsumed())
manager.clearSelectedPath();
}
/**
* Invoked when the cursor enters the menu. This method sets the selected
* path for the MenuSelectionManager and handles the case
* in which a menu item is used to pop up an additional menu, as in a
* hierarchical menu system.
*
* @param e the mouse event; not used
*/
public void mouseEntered(MouseEvent e) {
JMenu menu = (JMenu)menuItem;
// only disable the menu highlighting if it's disabled and the property isn't
// true. This allows disabled rollovers to work in WinL&F
if (!menu.isEnabled() && !UIManager.getBoolean("MenuItem.disabledAreNavigable")) {
return;
}
MenuSelectionManager manager =
MenuSelectionManager.defaultManager();
MenuElement selectedPath[] = manager.getSelectedPath();
if (!menu.isTopLevelMenu()) {
if(!(selectedPath.length > 0 &&
selectedPath[selectedPath.length-1] ==
menu.getPopupMenu())) {
if(menu.getDelay() == 0) {
appendPath(getPath(), menu.getPopupMenu());
} else {
manager.setSelectedPath(getPath());
setupPostTimer(menu);
}
}
} else {
if(selectedPath.length > 0 &&
selectedPath[0] == menu.getParent()) {
MenuElement newPath[] = new MenuElement[3];
// A top level menu's parent is by definition
// a JMenuBar
newPath[0] = (MenuElement)menu.getParent();
newPath[1] = menu;
if (BasicPopupMenuUI.getLastPopup() != null) {
newPath[2] = menu.getPopupMenu();
}
manager.setSelectedPath(newPath);
}
}
}
public void mouseExited(MouseEvent e) {
}
/**
* Invoked when a mouse button is pressed on the menu and then dragged.
* Delegates the mouse event to the MenuSelectionManager.
*
* @param e the mouse event
* @see java.awt.event.MouseMotionListener#mouseDragged
*/
public void mouseDragged(MouseEvent e) {
JMenu menu = (JMenu)menuItem;
if (!menu.isEnabled())
return;
MenuSelectionManager.defaultManager().processMouseEvent(e);
}
public void mouseMoved(MouseEvent e) {
}
//
// MenuDragHandler
//
public void menuDragMouseEntered(MenuDragMouseEvent e) {}
public void menuDragMouseDragged(MenuDragMouseEvent e) {
if (menuItem.isEnabled() == false)
return;
MenuSelectionManager manager = e.getMenuSelectionManager();
MenuElement path[] = e.getPath();
Point p = e.getPoint();
if(p.x >= 0 && p.x < menuItem.getWidth() &&
p.y >= 0 && p.y < menuItem.getHeight()) {
JMenu menu = (JMenu)menuItem;
MenuElement selectedPath[] = manager.getSelectedPath();
if(!(selectedPath.length > 0 &&
selectedPath[selectedPath.length-1] ==
menu.getPopupMenu())) {
if(menu.isTopLevelMenu() ||
menu.getDelay() == 0 ||
e.getID() == MouseEvent.MOUSE_DRAGGED) {
appendPath(path, menu.getPopupMenu());
} else {
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