112 lines
3.7 KiB
C++
112 lines
3.7 KiB
C++
/*
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* Copyright (C) 2015 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Apple Inc. ("Apple") nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "AccessibilityTree.h"
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#include "AXObjectCache.h"
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#include "AccessibilityTreeItem.h"
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#include "Element.h"
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#include "HTMLNames.h"
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#include <wtf/Deque.h>
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namespace WebCore {
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using namespace HTMLNames;
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AccessibilityTree::AccessibilityTree(RenderObject* renderer)
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: AccessibilityRenderObject(renderer)
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{
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}
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AccessibilityTree::~AccessibilityTree() = default;
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Ref<AccessibilityTree> AccessibilityTree::create(RenderObject* renderer)
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{
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return adoptRef(*new AccessibilityTree(renderer));
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}
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bool AccessibilityTree::computeAccessibilityIsIgnored() const
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{
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return accessibilityIsIgnoredByDefault();
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}
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AccessibilityRole AccessibilityTree::determineAccessibilityRole()
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{
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if ((m_ariaRole = determineAriaRoleAttribute()) != AccessibilityRole::Tree)
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return AccessibilityRenderObject::determineAccessibilityRole();
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return isTreeValid() ? AccessibilityRole::Tree : AccessibilityRole::Group;
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}
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bool AccessibilityTree::nodeHasTreeItemChild(Node& node) const
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{
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for (auto* child = node.firstChild(); child; child = child->nextSibling()) {
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if (nodeHasRole(child, "treeitem"))
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return true;
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}
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return false;
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}
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bool AccessibilityTree::isTreeValid() const
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{
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// A valid tree can only have treeitem or group of treeitems as a child
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// http://www.w3.org/TR/wai-aria/roles#tree
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Node* node = this->node();
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if (!node)
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return false;
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Deque<Node*> queue;
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for (auto* child = node->firstChild(); child; child = child->nextSibling())
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queue.append(child);
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while (!queue.isEmpty()) {
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auto child = queue.takeFirst();
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if (!is<Element>(*child))
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continue;
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if (nodeHasRole(child, "treeitem"))
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continue;
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if (nodeHasRole(child, "presentation")) {
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if (!nodeHasTreeItemChild(*child))
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return false;
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continue;
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}
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if (!nodeHasRole(child, "group"))
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return false;
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for (auto* groupChild = child->firstChild(); groupChild; groupChild = groupChild->nextSibling())
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queue.append(groupChild);
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}
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return true;
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}
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} // namespace WebCore
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