Slight revision to my code: Removing the "selected" style directly
from the MenuItem was causing too many bad side-effects. What really
needs to happen, is a call to "void selectItem(MenuItem item) { ... }"
on MenuBar. Unfortunately, that method's visibility doesn't allow
such a call. Unless, of course, you're willing to bend a few
rules. ;)
Menu bar = new MenuBar() {
@Override
public void onBrowserEvent(Event event) {
super.onBrowserEvent(event);
if (DOM.eventGetType(event) == Event.ONMOUSEOUT) {
Element barEle = getElement();
Element outEle = DOM.eventGetFromElement(event);
Element toEle = DOM.eventGetToElement(event);
if (DOM.isOrHasChild(barEle, outEle) &&
!DOM.isOrHasChild(barEle,
toEle)) {
// Focus has shifted off of the MenuBar.
But is it now on a sub-
menu?
boolean onSubMenu = false;
for (MenuItem mi : this.getItems()) {
MenuBar subMenu = mi.getSubMenu();
Widget parent = subMenu == null ? null
: subMenu.getParent();
Element parEle = parent == null ? null
: parent.getElement();
if ((parEle != null) &&
(DOM.isOrHasChild(parEle, toEle))) {
onSubMenu = true;
break;
}
}
if (!onSubMenu) {
MenuItem mi = getSelectedItem();
if (mi != null) {
unselectItem();
}
}
}
}
}
@Override
public void onPopupClosed(PopupPanel sender, boolean autoClosed) {
MenuItem mi = getSelectedItem();
if (mi != null) {
// Is the closed Popup the currently selected menu
item?
if (mi.getSubMenu() == sender.getWidget()) {
unselectItem();
}
}
super.onPopupClosed(sender, autoClosed);
}
private native String unselectItem() /*-{
[email protected]::selectItem(Lcom/
google/gwt/user/client/ui/MenuItem;)(null);
}-*/;
};
Hope this helps someone else,
john...
PS. The only scenario I have found where the above does not work is
when the user repeatedly clicks a menu item to open it's sub-menu over
and over again.
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