void itemOver(MenuItem item) {
if (item == null) {
// Don't clear selection if the currently selected item's menu is
// showing.
if ((selectedItem != null) && (shownChildMenu == selectedItem.getSubMenu())) {
return;
}
}
// Style the item selected when the mouse enters.
selectItem(item);
// If child menus are being shown, or this menu is itself
// a child menu, automatically show an item's child menu
// when the mouse enters.
if (item != null) {
if ((shownChildMenu != null) || (parentMenu != null) || autoOpen) {
doItemAction(item, false);
}
}
}
/*
* Performs the action associated with the given menu item. If the item has
* a popup associated with it, the popup will be shown. If it has a command
* associated with it, and 'fireCommand' is true, then the command will be
* fired. Popups associated with other items will be hidden.
*
* @param item the item whose popup is to be shown. @param fireCommand
* <code>true</code> if the item's command should be fired,
* <code>false</code> otherwise.
*/
protected void doItemAction(final MenuItem item, boolean fireCommand) {
// If the given item is already showing its menu, we're done.
if ((shownChildMenu != null) && (item.getSubMenu() == shownChildMenu)) {
return;
}
// If another item is showing its menu, then hide it.
if (shownChildMenu != null) {
shownChildMenu.onHide();
popup.hide();
}
// If the item has no popup, optionally fire its command.
if (item.getSubMenu() == null) {
if (fireCommand) {
// Close this menu and all of its parents.
closeAllParents();
// Fire the item's command.
final Command cmd = item.getCommand();
if (cmd != null) {
Scheduler.get().scheduleDeferred(cmd);
}
}
return;
}
// Ensure that the item is selected.
selectItem(item);
// Create a new popup for this item, and position it next to
// the item (below if this is a horizontal menu bar, to the
// right if it's a vertical bar).
popup =
new VOverlay(true) {
{
setWidget(item.getSubMenu());
item.getSubMenu().onShow();
setOwner(MenuBar.this);
}
@Override
public boolean onEventPreview(Event event) {
// Hook the popup panel's event preview. We use this to keep it
// from
// auto-hiding when the parent menu is clicked.
switch (DOM.eventGetType(event)) {
case Event.ONCLICK:
// If the event target is part of the parent menu, suppress
// the
// event altogether.
final Element target = DOM.eventGetTarget(event);
final Element parentMenuElement = item.getParentMenu().getElement();
if (DOM.isOrHasChild(parentMenuElement, target)) {
return false;
}
break;
}
return super.onEventPreview(event);
}
};
popup.addPopupListener(this);
if (vertical) {
popup.setPopupPosition(item.getAbsoluteLeft() + item.getOffsetWidth(), item.getAbsoluteTop());
} else {
popup.setPopupPosition(
item.getAbsoluteLeft(), item.getAbsoluteTop() + item.getOffsetHeight());
}
shownChildMenu = item.getSubMenu();
item.getSubMenu().parentMenu = this;
// Show the popup, ensuring that the menubar's event preview remains on
// top
// of the popup's.
popup.show();
}