* As the inheritance hierarchy implies, a PopupMenu
* can be used anywhere a Menu can be used.
* However, if you use a PopupMenu like a Menu
* (e.g., you add it to a MenuBar), then you cannot
* call show on that PopupMenu.
*
* @author Amy Fowler
*/
public class PopupMenu extends Menu {
private static final String base = "popup";
static int nameCounter = 0;
transient boolean isTrayIconPopup = false;
static {
AWTAccessor.setPopupMenuAccessor(
new AWTAccessor.PopupMenuAccessor() {
public boolean isTrayIconPopup(PopupMenu popupMenu) {
return popupMenu.isTrayIconPopup;
}
});
}
/*
* JDK 1.1 serialVersionUID
*/
private static final long serialVersionUID = -4620452533522760060L;
/**
* Creates a new popup menu with an empty name.
* @exception HeadlessException if GraphicsEnvironment.isHeadless()
* returns true.
* @see java.awt.GraphicsEnvironment#isHeadless
*/
public PopupMenu() throws HeadlessException {
this("");
}
/**
* Creates a new popup menu with the specified name.
*
* @param label a non-null string specifying
* the popup menu's label
* @exception HeadlessException if GraphicsEnvironment.isHeadless()
* returns true.
* @see java.awt.GraphicsEnvironment#isHeadless
*/
public PopupMenu(String label) throws HeadlessException {
super(label);
}
/**
* {@inheritDoc}
*/
public MenuContainer getParent() {
if (isTrayIconPopup) {
return null;
}
return super.getParent();
}
/**
* Constructs a name for this MenuComponent.
* Called by getName when the name is null.
*/
String constructComponentName() {
synchronized (PopupMenu.class) {
return base + nameCounter++;
}
}
/**
* Creates the popup menu's peer.
* The peer allows us to change the appearance of the popup menu without
* changing any of the popup menu's functionality.
*/
public void addNotify() {
synchronized (getTreeLock()) {
// If our parent is not a Component, then this PopupMenu is
// really just a plain, old Menu.
if (parent != null && !(parent instanceof Component)) {
super.addNotify();
}
else {
if (peer == null)
peer = Toolkit.getDefaultToolkit().createPopupMenu(this);
int nitems = getItemCount();
for (int i = 0 ; i < nitems ; i++) {
MenuItem mi = getItem(i);
mi.parent = this;
mi.addNotify();
}
}
}
}
/**
* Shows the popup menu at the x, y position relative to an origin
* component.
* The origin component must be contained within the component
* hierarchy of the popup menu's parent. Both the origin and the parent
* must be showing on the screen for this method to be valid.
*
* If this PopupMenu is being used as a Menu
* (i.e., it has a non-Component parent),
* then you cannot call this method on the PopupMenu.
*
* @param origin the component which defines the coordinate space
* @param x the x coordinate position to popup the menu
* @param y the y coordinate position to popup the menu
* @exception NullPointerException if the parent is null
* @exception IllegalArgumentException if this PopupMenu
* has a non-Component parent
* @exception IllegalArgumentException if the origin is not in the
* parent's hierarchy
* @exception RuntimeException if the parent is not showing on screen
*/
public void show(Component origin, int x, int y) {
// Use localParent for thread safety.
MenuContainer localParent = parent;
if (localParent == null) {
throw new NullPointerException("parent is null");
}
if (!(localParent instanceof Component)) {
throw new IllegalArgumentException(
"PopupMenus with non-Component parents cannot be shown");
}
Component compParent = (Component)localParent;
//Fixed 6278745: Incorrect exception throwing in PopupMenu.show() method
//Exception was not thrown if compParent was not equal to origin and
//was not Container
if (compParent != origin) {
if (compParent instanceof Container) {
if (!((Container)compParent).isAncestorOf(origin)) {
throw new IllegalArgumentException("origin not in parent's hierarchy");
}
} else {
throw new IllegalArgumentException("origin not in parent's hierarchy");
}
}
if (compParent.peer == null || !compParent.isShowing()) {
throw new RuntimeException("parent not showing on screen");
}
if (peer == null) {
addNotify();
}
synchronized (getTreeLock()) {
if (peer != null) {
((PopupMenuPeer)peer).show(
new Event(origin, 0, Event.MOUSE_DOWN, x, y, 0, 0));
}
}
}
/////////////////
// Accessibility support
////////////////
/**
* Gets the AccessibleContext associated with this
* PopupMenu.
*
* @return the AccessibleContext of this
* PopupMenu
* @since 1.3
*/
public AccessibleContext getAccessibleContext() {
if (accessibleContext == null) {
accessibleContext = new AccessibleAWTPopupMenu();
}
return accessibleContext;
}
/**
* Inner class of PopupMenu used to provide default support for
* accessibility. This class is not meant to be used directly by
* application developers, but is instead meant only to be
* subclassed by menu component developers.
*
* The class used to obtain the accessible role for this object. * @since 1.3 */ protected class AccessibleAWTPopupMenu extends AccessibleAWTMenu { /* * JDK 1.3 serialVersionUID */ private static final long serialVersionUID = -4282044795947239955L; /** * Get the role of this object. * * @return an instance of AccessibleRole describing the role of the * object */ public AccessibleRole getAccessibleRole() { return AccessibleRole.POPUP_MENU; } } // class AccessibleAWTPopupMenu }