One AXObjectCache per frame

third_party/WebKit/Source/modules/accessibility/AXScrollView.cpp

Index: third_party/WebKit/Source/modules/accessibility/AXScrollView.cpp
diff --git a/third_party/WebKit/Source/modules/accessibility/AXScrollView.cpp b/third_party/WebKit/Source/modules/accessibility/AXScrollView.cpp
deleted file mode 100644
index e4cd6c2d8df26405a041fd431783f2f462fcc199..0000000000000000000000000000000000000000
--- a/third_party/WebKit/Source/modules/accessibility/AXScrollView.cpp
+++ /dev/null
@@ -1,264 +0,0 @@
-/*
- * Copyright (C) 2011 Apple Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1.  Redistributions of source code must retain the above copyright
- *     notice, this list of conditions and the following disclaimer.
- * 2.  Redistributions in binary form must reproduce the above copyright
- *     notice, this list of conditions and the following disclaimer in the
- *     documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "config.h"
-#include "modules/accessibility/AXScrollView.h"
-
-#include "core/frame/FrameView.h"
-#include "core/frame/LocalFrame.h"
-#include "core/html/HTMLFrameOwnerElement.h"
-#include "modules/accessibility/AXObjectCacheImpl.h"
-#include "modules/accessibility/AXScrollbar.h"
-
-namespace blink {
-
-AXScrollView::AXScrollView(FrameView* view, AXObjectCacheImpl& axObjectCache)
-    : AXObject(axObjectCache)
-    , m_scrollView(view)
-    , m_childrenDirty(false)
-{
-}
-
-AXScrollView::~AXScrollView()
-{
-    ASSERT(!m_scrollView);
-}
-
-void AXScrollView::detach()
-{
-    AXObject::detach();
-    m_scrollView = nullptr;
-}
-
-AXScrollView* AXScrollView::create(FrameView* view, AXObjectCacheImpl& axObjectCache)
-{
-    return new AXScrollView(view, axObjectCache);
-}
-
-AXObject* AXScrollView::scrollBar(AccessibilityOrientation orientation)
-{
-    updateScrollbars();
-
-    switch (orientation) {
-    case AccessibilityOrientationVertical:
-        return m_verticalScrollbar ? m_verticalScrollbar.get() : 0;
-    case AccessibilityOrientationHorizontal:
-        return m_horizontalScrollbar ? m_horizontalScrollbar.get() : 0;
-    case AccessibilityOrientationUndefined:
-        return 0;
-    }
-
-    return 0;
-}
-
-// If this is WebKit1 then the native scroll view needs to return the
-// AX information (because there are no scroll bar children in the FrameView object in WK1).
-// In WebKit2, the FrameView object will return the AX information (because there are no platform widgets).
-bool AXScrollView::isAttachment() const
-{
-    return false;
-}
-
-Widget* AXScrollView::widgetForAttachmentView() const
-{
-    return m_scrollView;
-}
-
-void AXScrollView::updateChildrenIfNecessary()
-{
-    if (m_childrenDirty)
-        clearChildren();
-
-    if (!m_haveChildren)
-        addChildren();
-
-    updateScrollbars();
-}
-
-void AXScrollView::updateScrollbars()
-{
-    if (!m_scrollView)
-        return;
-
-    if (m_scrollView->horizontalScrollbar() && !m_horizontalScrollbar) {
-        m_horizontalScrollbar = addChildScrollbar(m_scrollView->horizontalScrollbar());
-    } else if (!m_scrollView->horizontalScrollbar() && m_horizontalScrollbar) {
-        removeChildScrollbar(m_horizontalScrollbar.get());
-        m_horizontalScrollbar = nullptr;
-    }
-
-    if (m_scrollView->verticalScrollbar() && !m_verticalScrollbar) {
-        m_verticalScrollbar = addChildScrollbar(m_scrollView->verticalScrollbar());
-    } else if (!m_scrollView->verticalScrollbar() && m_verticalScrollbar) {
-        removeChildScrollbar(m_verticalScrollbar.get());
-        m_verticalScrollbar = nullptr;
-    }
-}
-
-void AXScrollView::removeChildScrollbar(AXObject* scrollbar)
-{
-    size_t pos = m_children.find(scrollbar);
-    if (pos != kNotFound) {
-        m_children[pos]->detachFromParent();
-        m_children.remove(pos);
-    }
-}
-
-AXScrollbar* AXScrollView::addChildScrollbar(Scrollbar* scrollbar)
-{
-    if (!scrollbar)
-        return 0;
-
-    AXScrollbar* scrollBarObject = toAXScrollbar(axObjectCache().getOrCreate(scrollbar));
-    scrollBarObject->setParent(this);
-    m_children.append(scrollBarObject);
-    return scrollBarObject;
-}
-
-void AXScrollView::clearChildren()
-{
-    AXObject::clearChildren();
-    m_verticalScrollbar = nullptr;
-    m_horizontalScrollbar = nullptr;
-}
-
-bool AXScrollView::computeAccessibilityIsIgnored(IgnoredReasons* ignoredReasons) const
-{
-    // We just want to match whatever's returned by our web area, which is a child of this
-    // object. Normally cached attribute values may only search up the tree. We can't just
-    // call accessibilityIsIgnored on the web area, because the web area may search up its
-    // ancestors and call this function recursively, and we'd loop until a stack overflow.
-
-    // Instead, we first update the cached accessibilityIsIgnored value for this node to
-    // false, call accessibilityIsIgnored on the web area, then return the mathcing value.
-    m_cachedIsIgnored = false;
-    m_lastModificationCount = axObjectCache().modificationCount();
-
-    AXObject* webArea = webAreaObject();
-    if (!webArea)
-        return true;
-
-    if (!webArea->accessibilityIsIgnored())
-        return false;
-
-    if (ignoredReasons)
-        return webArea->computeAccessibilityIsIgnored(ignoredReasons);
-
-    return true;
-}
-
-void AXScrollView::addChildren()
-{
-    ASSERT(!m_haveChildren);
-    m_haveChildren = true;
-
-    AXObject* webArea = webAreaObject();
-    if (webArea && !webArea->accessibilityIsIgnored())
-        m_children.append(webArea);
-
-    updateScrollbars();
-}
-
-AXObject* AXScrollView::webAreaObject() const
-{
-    if (!m_scrollView || !m_scrollView->isFrameView())
-        return 0;
-
-    Document* doc = m_scrollView->frame().document();
-    if (!doc || !doc->layoutView())
-        return 0;
-
-    return axObjectCache().getOrCreate(doc);
-}
-
-AXObject* AXScrollView::accessibilityHitTest(const IntPoint& point) const
-{
-    AXObject* webArea = webAreaObject();
-    if (!webArea)
-        return 0;
-
-    if (m_horizontalScrollbar && m_horizontalScrollbar->elementRect().contains(point))
-        return m_horizontalScrollbar.get();
-    if (m_verticalScrollbar && m_verticalScrollbar->elementRect().contains(point))
-        return m_verticalScrollbar.get();
-
-    return webArea->accessibilityHitTest(point);
-}
-
-LayoutRect AXScrollView::elementRect() const
-{
-    if (!m_scrollView)
-        return LayoutRect();
-
-    return LayoutRect(m_scrollView->frameRect());
-}
-
-FrameView* AXScrollView::documentFrameView() const
-{
-    if (!m_scrollView || !m_scrollView->isFrameView())
-        return 0;
-
-    return m_scrollView;
-}
-
-AXObject* AXScrollView::computeParent() const
-{
-    if (!m_scrollView || !m_scrollView->isFrameView())
-        return 0;
-
-    // FIXME: Broken for OOPI.
-    HTMLFrameOwnerElement* owner = m_scrollView->frame().deprecatedLocalOwner();
-    if (owner && owner->layoutObject())
-        return axObjectCache().getOrCreate(owner);
-
-    return axObjectCache().getOrCreate(m_scrollView->frame().pagePopupOwner());
-}
-
-AXObject* AXScrollView::computeParentIfExists() const
-{
-    if (!m_scrollView || !m_scrollView->isFrameView())
-        return 0;
-
-    HTMLFrameOwnerElement* owner = m_scrollView->frame().deprecatedLocalOwner();
-    if (owner && owner->layoutObject())
-        return axObjectCache().get(owner);
-
-    return axObjectCache().get(m_scrollView->frame().pagePopupOwner());
-}
-
-ScrollableArea* AXScrollView::getScrollableAreaIfScrollable() const
-{
-    return m_scrollView;
-}
-
-DEFINE_TRACE(AXScrollView)
-{
-    visitor->trace(m_scrollView);
-    visitor->trace(m_horizontalScrollbar);
-    visitor->trace(m_verticalScrollbar);
-    AXObject::trace(visitor);
-}
-
-} // namespace blink