/**
* Removes all top-level sub-menus and reassigns their children to the parent menu.
*
* @param menu The parent menu containing the sub-menus to collapse.
*/
private static void collapseSubMenus(RadialMenu menu) {
final List<RadialMenuItem> menuItems = menu.getItems(false /* includeCorners */);
for (RadialMenuItem item : menuItems) {
if (item.hasSubMenu()) {
final RadialSubMenu subMenu = item.getSubMenu();
final List<RadialMenuItem> subItems = subMenu.getItems(true /* includeCorners */);
menu.removeItem(item.getItemId());
menu.addAll(subItems);
}
}
}
/**
* Populates a {@link RadialMenu} with items specific to the provided node based on {@link
* NodeMenuRule}s.
*
* @param menu The menu to populate.
* @param node The node with which to populate the menu.
* @return {@code true} if successful, {@code false} otherwise.
*/
public boolean prepareMenuForNode(RadialMenu menu, AccessibilityNodeInfoCompat node) {
if (node == null) {
return false;
}
// Always reset the menu since it is based on the current cursor.
menu.clear();
// Track which rules accept the node.
final LinkedList<NodeMenuRule> matchingRules = new LinkedList<NodeMenuRule>();
for (NodeMenuRule rule : mRules) {
if (rule.accept(mService, node)) {
matchingRules.add(rule);
}
}
boolean canCollapseMenu = false;
for (NodeMenuRule rule : matchingRules) {
final List<RadialMenuItem> ruleResults = rule.getMenuItemsForNode(mService, node);
if (ruleResults.isEmpty()) {
continue;
}
final CharSequence subMenuName = rule.getUserFriendlyMenuName(mService);
final RadialSubMenu ruleSubMenu =
menu.addSubMenu(RadialMenu.NONE, 0, RadialMenu.NONE, subMenuName);
ruleSubMenu.addAll(ruleResults);
canCollapseMenu |= rule.canCollapseMenu();
}
// Collapse if the menu contains only a single collapsible sub-menu.
if ((menu.size() == 1) && canCollapseMenu) {
collapseSubMenus(menu);
}
if (menu.size() == 0) {
mSpeechController.speak(
mService.getString(R.string.title_local_breakout_no_items),
SpeechController.QUEUE_MODE_FLUSH_ALL,
FeedbackItem.FLAG_NO_HISTORY,
null);
return false;
}
return true;
}