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/*
* Copyright (C) 2008 Nuanti Ltd.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "AXObjectCache.h"
#include "AccessibilityObject.h"
#include "AccessibilityObjectWrapperAtk.h"
#include "AccessibilityRenderObject.h"
#include "GOwnPtr.h"
#include "Range.h"
#include "SelectElement.h"
#include "TextIterator.h"
namespace WebCore {
void AXObjectCache::detachWrapper(AccessibilityObject* obj)
{
webkit_accessible_detach(WEBKIT_ACCESSIBLE(obj->wrapper()));
}
void AXObjectCache::attachWrapper(AccessibilityObject* obj)
{
AtkObject* atkObj = ATK_OBJECT(webkit_accessible_new(obj));
obj->setWrapper(atkObj);
g_object_unref(atkObj);
}
static AccessibilityObject* getListObject(AccessibilityObject* object)
{
// Only list boxes and menu lists supported so far.
if (!object->isListBox() && !object->isMenuList())
return 0;
// For list boxes the list object is just itself.
if (object->isListBox())
return object;
// For menu lists we need to return the first accessible child,
// with role MenuListPopupRole, since that's the one holding the list
// of items with role MenuListOptionRole.
AccessibilityObject::AccessibilityChildrenVector children = object->children();
if (!children.size())
return 0;
AccessibilityObject* listObject = children.at(0).get();
if (!listObject->isMenuListPopup())
return 0;
return listObject;
}
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.
DEFINE_STATIC_LOCAL(RefPtr<AccessibilityObject>, oldListObject, ());
DEFINE_STATIC_LOCAL(RefPtr<AccessibilityObject>, oldFocusedObject, ());
// Only list boxes and menu lists supported so far.
if (!object || !(object->isListBox() || object->isMenuList()))
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.
SelectElement* select = toSelectElement(static_cast<Element*>(object->node()));
if (!select)
return;
int changedItemIndex = select->activeSelectionStartListIndex();
AccessibilityObject* listObject = getListObject(object);
if (!listObject) {
oldListObject = 0;
return;
}
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 != listObject)
oldFocusedObject = 0;
AtkObject* axItem = item ? item->wrapper() : 0;
AtkObject* axOldFocusedObject = oldFocusedObject ? oldFocusedObject->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);
g_signal_emit_by_name(axOldFocusedObject, "state-change", "focused", false);
}
// Emit needed events for the currently (un)selected item.
if (axItem) {
bool isSelected = item->isSelected();
g_signal_emit_by_name(axItem, "state-change", "selected", isSelected);
g_signal_emit_by_name(axItem, "focus-event", isSelected);
g_signal_emit_by_name(axItem, "state-change", "focused", isSelected);
}
// Update pointers to the previously involved objects.
oldListObject = listObject;
oldFocusedObject = item;
}
void AXObjectCache::postPlatformNotification(AccessibilityObject* coreObject, AXNotification notification)
{
AtkObject* axObject = coreObject->wrapper();
if (!axObject)
return;
if (notification == AXCheckedStateChanged) {
if (!coreObject->isCheckboxOrRadio())
return;
g_signal_emit_by_name(axObject, "state-change", "checked", coreObject->isChecked());
} else if (notification == AXSelectedChildrenChanged || notification == AXMenuListValueChanged) {
if (notification == AXMenuListValueChanged && coreObject->isMenuList()) {
g_signal_emit_by_name(axObject, "focus-event", true);
g_signal_emit_by_name(axObject, "state-change", "focused", true);
}
notifyChildrenSelectionChange(coreObject);
} else if (notification == AXValueChanged) {
if (!ATK_IS_VALUE(axObject))
return;
AtkPropertyValues propertyValues;
propertyValues.property_name = "accessible-value";
memset(&propertyValues.new_value, 0, sizeof(GValue));
atk_value_get_current_value(ATK_VALUE(axObject), &propertyValues.new_value);
g_signal_emit_by_name(ATK_OBJECT(axObject), "property-change::accessible-value", &propertyValues, NULL);
}
}
static void emitTextChanged(AccessibilityRenderObject* object, AXObjectCache::AXTextChange textChange, unsigned offset, unsigned count)
{
// Get the axObject for the parent object
AtkObject* wrapper = object->parentObjectUnignored()->wrapper();
if (!wrapper || !ATK_IS_TEXT(wrapper))
return;
// Select the right signal to be emitted
CString detail;
switch (textChange) {
case AXObjectCache::AXTextInserted:
detail = "text-changed::insert";
break;
case AXObjectCache::AXTextDeleted:
detail = "text-changed::delete";
break;
}
if (!detail.isNull())
g_signal_emit_by_name(wrapper, detail.data(), offset, count);
}
void AXObjectCache::nodeTextChangePlatformNotification(AccessibilityObject* object, AXTextChange textChange, unsigned offset, unsigned count)
{
// Sanity check
if (count < 1 || !object || !object->isAccessibilityRenderObject())
return;
Node* node = object->node();
RefPtr<Range> range = Range::create(node->document(), Position(node->parentNode(), 0), Position(node, 0));
emitTextChanged(toAccessibilityRenderObject(object), textChange, offset + TextIterator::rangeLength(range.get()), count);
}
void AXObjectCache::handleFocusedUIElementChanged(RenderObject* oldFocusedRender, RenderObject* newFocusedRender)
{
RefPtr<AccessibilityObject> oldObject = getOrCreate(oldFocusedRender);
if (oldObject) {
g_signal_emit_by_name(oldObject->wrapper(), "focus-event", false);
g_signal_emit_by_name(oldObject->wrapper(), "state-change", "focused", false);
}
RefPtr<AccessibilityObject> newObject = getOrCreate(newFocusedRender);
if (newObject) {
g_signal_emit_by_name(newObject->wrapper(), "focus-event", true);
g_signal_emit_by_name(newObject->wrapper(), "state-change", "focused", true);
}
}
void AXObjectCache::handleScrolledToAnchor(const Node*)
{
}
} // namespace WebCore
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