289 lines
8.9 KiB
C++
289 lines
8.9 KiB
C++
/*
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* Copyright (C) 2011 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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*
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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 "AccessibilityScrollView.h"
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#include "AXObjectCache.h"
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#include "AccessibilityScrollbar.h"
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#include "Frame.h"
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#include "FrameView.h"
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#include "HTMLFrameOwnerElement.h"
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#include "RenderElement.h"
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#include "ScrollView.h"
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#include "Widget.h"
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namespace WebCore {
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AccessibilityScrollView::AccessibilityScrollView(ScrollView* view)
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: m_scrollView(makeWeakPtr(view))
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, m_childrenDirty(false)
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{
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}
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AccessibilityScrollView::~AccessibilityScrollView()
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{
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ASSERT(isDetached());
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}
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void AccessibilityScrollView::detachRemoteParts(AccessibilityDetachmentType detachmentType)
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{
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AccessibilityObject::detachRemoteParts(detachmentType);
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m_scrollView = nullptr;
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}
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Ref<AccessibilityScrollView> AccessibilityScrollView::create(ScrollView* view)
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{
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return adoptRef(*new AccessibilityScrollView(view));
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}
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AccessibilityObject* AccessibilityScrollView::scrollBar(AccessibilityOrientation orientation)
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{
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updateScrollbars();
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switch (orientation) {
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// ARIA 1.1 Elements with the role scrollbar have an implicit aria-orientation value of vertical.
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case AccessibilityOrientation::Undefined:
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case AccessibilityOrientation::Vertical:
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return m_verticalScrollbar ? m_verticalScrollbar.get() : nullptr;
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case AccessibilityOrientation::Horizontal:
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return m_horizontalScrollbar ? m_horizontalScrollbar.get() : nullptr;
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}
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return nullptr;
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}
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// If this is WebKit1 then the native scroll view needs to return the
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// AX information (because there are no scroll bar children in the ScrollView object in WK1).
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// In WebKit2, the ScrollView object will return the AX information (because there are no platform widgets).
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bool AccessibilityScrollView::isAttachment() const
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{
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return m_scrollView && m_scrollView->platformWidget();
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}
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PlatformWidget AccessibilityScrollView::platformWidget() const
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{
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return m_scrollView ? m_scrollView->platformWidget() : nullptr;
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}
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Widget* AccessibilityScrollView::widgetForAttachmentView() const
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{
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return m_scrollView.get();
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}
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bool AccessibilityScrollView::canSetFocusAttribute() const
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{
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AccessibilityObject* webArea = webAreaObject();
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return webArea && webArea->canSetFocusAttribute();
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}
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bool AccessibilityScrollView::isFocused() const
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{
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AccessibilityObject* webArea = webAreaObject();
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return webArea && webArea->isFocused();
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}
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void AccessibilityScrollView::setFocused(bool focused)
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{
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// Call the base class setFocused to ensure the view is focused and active.
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AccessibilityObject::setFocused(focused);
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if (AccessibilityObject* webArea = webAreaObject())
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webArea->setFocused(focused);
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}
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void AccessibilityScrollView::updateChildrenIfNecessary()
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{
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// Always update our children when asked for them so that we don't inadvertently cache them after
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// a new web area has been created for this scroll view (like when moving back and forth through history).
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// Since a ScrollViews children will always be relatively small and limited this should not be a performance problem.
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clearChildren();
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addChildren();
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}
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void AccessibilityScrollView::updateScrollbars()
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{
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if (!m_scrollView)
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return;
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if (m_scrollView->horizontalScrollbar() && !m_horizontalScrollbar)
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m_horizontalScrollbar = addChildScrollbar(m_scrollView->horizontalScrollbar());
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else if (!m_scrollView->horizontalScrollbar() && m_horizontalScrollbar) {
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removeChildScrollbar(m_horizontalScrollbar.get());
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m_horizontalScrollbar = nullptr;
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}
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if (m_scrollView->verticalScrollbar() && !m_verticalScrollbar)
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m_verticalScrollbar = addChildScrollbar(m_scrollView->verticalScrollbar());
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else if (!m_scrollView->verticalScrollbar() && m_verticalScrollbar) {
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removeChildScrollbar(m_verticalScrollbar.get());
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m_verticalScrollbar = nullptr;
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}
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}
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void AccessibilityScrollView::removeChildScrollbar(AccessibilityObject* scrollbar)
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{
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size_t pos = m_children.find(scrollbar);
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if (pos != WTF::notFound) {
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m_children[pos]->detachFromParent();
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m_children.remove(pos);
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}
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}
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AccessibilityScrollbar* AccessibilityScrollView::addChildScrollbar(Scrollbar* scrollbar)
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{
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if (!scrollbar)
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return nullptr;
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AXObjectCache* cache = axObjectCache();
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if (!cache)
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return nullptr;
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auto& scrollBarObject = downcast<AccessibilityScrollbar>(*cache->getOrCreate(scrollbar));
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scrollBarObject.setParent(this);
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m_children.append(&scrollBarObject);
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return &scrollBarObject;
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}
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void AccessibilityScrollView::clearChildren()
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{
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AccessibilityObject::clearChildren();
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m_verticalScrollbar = nullptr;
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m_horizontalScrollbar = nullptr;
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}
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bool AccessibilityScrollView::computeAccessibilityIsIgnored() const
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{
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AccessibilityObject* webArea = webAreaObject();
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if (!webArea)
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return true;
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return webArea->accessibilityIsIgnored();
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}
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void AccessibilityScrollView::addChildren()
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{
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ASSERT(!m_haveChildren);
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m_haveChildren = true;
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addChild(webAreaObject());
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updateScrollbars();
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}
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AccessibilityObject* AccessibilityScrollView::webAreaObject() const
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{
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if (!is<FrameView>(m_scrollView.get()))
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return nullptr;
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Document* document = downcast<FrameView>(*m_scrollView).frame().document();
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if (!document || !document->hasLivingRenderTree())
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return nullptr;
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if (AXObjectCache* cache = axObjectCache())
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return cache->getOrCreate(document);
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return nullptr;
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}
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AXCoreObject* AccessibilityScrollView::accessibilityHitTest(const IntPoint& point) const
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{
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AccessibilityObject* webArea = webAreaObject();
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if (!webArea)
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return nullptr;
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if (m_horizontalScrollbar && m_horizontalScrollbar->elementRect().contains(point))
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return m_horizontalScrollbar.get();
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if (m_verticalScrollbar && m_verticalScrollbar->elementRect().contains(point))
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return m_verticalScrollbar.get();
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return webArea->accessibilityHitTest(point);
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}
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LayoutRect AccessibilityScrollView::elementRect() const
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{
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if (!m_scrollView)
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return LayoutRect();
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LayoutRect rect = m_scrollView->frameRect();
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float topContentInset = m_scrollView->topContentInset();
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// Top content inset pushes the frame down and shrinks it.
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rect.move(0, topContentInset);
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rect.contract(0, topContentInset);
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return rect;
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}
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FrameView* AccessibilityScrollView::documentFrameView() const
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{
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if (!is<FrameView>(m_scrollView.get()))
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return nullptr;
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return downcast<FrameView>(m_scrollView.get());
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}
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AccessibilityObject* AccessibilityScrollView::parentObject() const
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{
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if (!is<FrameView>(m_scrollView.get()))
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return nullptr;
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AXObjectCache* cache = axObjectCache();
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if (!cache)
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return nullptr;
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HTMLFrameOwnerElement* owner = downcast<FrameView>(*m_scrollView).frame().ownerElement();
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if (owner && owner->renderer())
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return cache->getOrCreate(owner);
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return nullptr;
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}
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AccessibilityObject* AccessibilityScrollView::parentObjectIfExists() const
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{
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if (!is<FrameView>(m_scrollView.get()))
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return nullptr;
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AXObjectCache* cache = axObjectCache();
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if (!cache)
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return nullptr;
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HTMLFrameOwnerElement* owner = downcast<FrameView>(*m_scrollView).frame().ownerElement();
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if (owner && owner->renderer())
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return cache->get(owner);
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return nullptr;
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}
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ScrollableArea* AccessibilityScrollView::getScrollableAreaIfScrollable() const
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{
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return m_scrollView.get();
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}
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void AccessibilityScrollView::scrollTo(const IntPoint& point) const
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{
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if (m_scrollView)
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m_scrollView->setScrollPosition(point);
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}
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} // namespace WebCore
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