void RenderListBox::scrollToRevealSelection()
{
HTMLSelectElement* select = toHTMLSelectElement(node());
m_scrollToRevealSelectionAfterLayout = false;
int firstIndex = select->activeSelectionStartListIndex();
if (firstIndex >= 0 && !listIndexIsVisible(select->activeSelectionEndListIndex()))
scrollToRevealElementAtListIndex(firstIndex);
}
static void notifyChildrenSelectionChange(AccessibilityObject* object)
{
// This static variables are needed to keep track of the old
// focused object and its associated list object, as per previous
// calls to this function, in order to properly decide whether to
// emit some signals or not.
static NeverDestroyed<RefPtr<AccessibilityObject>> oldListObject;
static NeverDestroyed<RefPtr<AccessibilityObject>> oldFocusedObject;
// Only list boxes and menu lists supported so far.
if (!object || !(object->isListBox() || object->isMenuList()))
return;
// Only support HTML select elements so far (ARIA selectors not supported).
Node* node = object->node();
if (!node || !isHTMLSelectElement(node))
return;
// Emit signal from the listbox's point of view first.
g_signal_emit_by_name(object->wrapper(), "selection-changed");
// Find the item where the selection change was triggered from.
HTMLSelectElement* select = toHTMLSelectElement(node);
if (!select)
return;
int changedItemIndex = select->activeSelectionStartListIndex();
AccessibilityObject* listObject = getListObject(object);
if (!listObject) {
oldListObject.get() = 0;
return;
}
const AccessibilityObject::AccessibilityChildrenVector& items = listObject->children();
if (changedItemIndex < 0 || changedItemIndex >= static_cast<int>(items.size()))
return;
AccessibilityObject* item = items.at(changedItemIndex).get();
// Ensure the current list object is the same than the old one so
// further comparisons make sense. Otherwise, just reset
// oldFocusedObject so it won't be taken into account.
if (oldListObject.get() != listObject)
oldFocusedObject.get() = 0;
AtkObject* axItem = item ? item->wrapper() : 0;
AtkObject* axOldFocusedObject = oldFocusedObject.get() ? oldFocusedObject.get()->wrapper() : 0;
// Old focused object just lost focus, so emit the events.
if (axOldFocusedObject && axItem != axOldFocusedObject) {
g_signal_emit_by_name(axOldFocusedObject, "focus-event", false);
atk_object_notify_state_change(axOldFocusedObject, ATK_STATE_FOCUSED, false);
}
// Emit needed events for the currently (un)selected item.
if (axItem) {
bool isSelected = item->isSelected();
atk_object_notify_state_change(axItem, ATK_STATE_SELECTED, isSelected);
g_signal_emit_by_name(axItem, "focus-event", isSelected);
atk_object_notify_state_change(axItem, ATK_STATE_FOCUSED, isSelected);
}
// Update pointers to the previously involved objects.
oldListObject.get() = listObject;
oldFocusedObject.get() = item;
}