Reland "Implement FullScreen using top layer."

third_party/WebKit/Source/core/dom/Fullscreen.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * 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 "core/dom/Fullscreen.h"
 
+#include "bindings/core/v8/ExceptionMessages.h"
 #include "core/HTMLNames.h"
 #include "core/dom/Document.h"
 #include "core/dom/ElementTraversal.h"
 #include "core/dom/StyleChangeReason.h"
 #include "core/dom/StyleEngine.h"
 #include "core/events/Event.h"
 #include "core/frame/FrameHost.h"
 #include "core/frame/HostsUsingFeatures.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
 #include "core/frame/UseCounter.h"
 #include "core/html/HTMLIFrameElement.h"
 #include "core/html/HTMLMediaElement.h"
 #include "core/input/EventHandler.h"
 #include "core/inspector/ConsoleMessage.h"
-#include "core/layout/LayoutBlockFlow.h"
-#include "core/layout/LayoutFullScreen.h"
-#include "core/layout/api/LayoutFullScreenItem.h"
 #include "core/page/ChromeClient.h"
+#include "core/page/Page.h"
+#include "core/style/ComputedStyle.h"
 #include "platform/UserGestureIndicator.h"
 
 namespace blink {
 
 using namespace HTMLNames;
 
 namespace {
 
 bool fullscreenIsAllowedForAllOwners(const Document& document)
 {
@@ skipping 130 matching lines @@
     return 0;
 }
 
 bool Fullscreen::isFullScreen(Document& document)
 {
     return currentFullScreenElementFrom(document);
 }
 
 Fullscreen::Fullscreen(Document& document)
     : ContextLifecycleObserver(&document)
-    , m_fullScreenLayoutObject(nullptr)
     , m_eventQueueTimer(this, &Fullscreen::eventQueueTimerFired)
     , m_forCrossProcessAncestor(false)
 {
     document.setHasFullscreenSupplement();
 }
 
 Fullscreen::~Fullscreen()
 {
 }
 
 inline Document* Fullscreen::document()
 {
     return toDocument(lifecycleContext());
 }
 
 void Fullscreen::contextDestroyed()
 {
     m_eventQueue.clear();
 
-    if (m_fullScreenLayoutObject)
-        m_fullScreenLayoutObject->destroy();
-
     m_fullScreenElement = nullptr;
     m_fullScreenElementStack.clear();
 
 }
 
 void Fullscreen::requestFullscreen(Element& element, RequestType requestType, bool forCrossProcessAncestor)
 {
     // Use counters only need to be incremented in the process of the actual
     // fullscreen element.
     if (!forCrossProcessAncestor) {
@@ skipping 247 matching lines @@
     // 4. The fullscreenEnabled attribute must return true if the context object has its
     //    fullscreen enabled flag set and fullscreen is supported, and false otherwise.
 
     // Top-level browsing contexts are implied to have their allowFullScreen attribute set.
     return fullscreenIsAllowedForAllOwners(document) && fullscreenIsSupported(document);
 }
 
 void Fullscreen::didEnterFullScreenForElement(Element* element)
 {
     DCHECK(element);
+    DCHECK(element->isInTopLayer());
+
     if (!document()->isActive())
         return;
 
-    if (m_fullScreenLayoutObject)
-        m_fullScreenLayoutObject->unwrapLayoutObject();
-
     m_fullScreenElement = element;
 
-    // Create a placeholder block for a the full-screen element, to keep the page from reflowing
-    // when the element is removed from the normal flow. Only do this for a LayoutBox, as only
-    // a box will have a frameRect. The placeholder will be created in setFullScreenLayoutObject()
-    // during layout.
-    LayoutObject* layoutObject = m_fullScreenElement->layoutObject();
-    bool shouldCreatePlaceholder = layoutObject && layoutObject->isBox();
-    if (shouldCreatePlaceholder) {
-        m_savedPlaceholderFrameRect = toLayoutBox(layoutObject)->frameRect();
-        m_savedPlaceholderComputedStyle = ComputedStyle::clone(layoutObject->styleRef());
-    }
-
-    // TODO(alexmos): When |m_forCrossProcessAncestor| is true, some of
-    // this layout work has already been done in another process, so it should
-    // not be necessary to repeat it here.
-    if (m_fullScreenElement != document()->documentElement())
-        LayoutFullScreen::wrapLayoutObject(layoutObject, layoutObject ? layoutObject->parent() : 0, document());
-
     if (m_forCrossProcessAncestor) {
         DCHECK(m_fullScreenElement->isFrameOwnerElement());
         DCHECK(toHTMLFrameOwnerElement(m_fullScreenElement)->contentFrame()->isRemoteFrame());
         m_fullScreenElement->setContainsFullScreenElement(true);
     }
 
     m_fullScreenElement->setContainsFullScreenElementOnAncestorsCrossingFrameBoundaries(true);
 
     document()->styleEngine().ensureFullscreenUAStyle();
     m_fullScreenElement->pseudoStateChanged(CSSSelector::PseudoFullScreen);
@@ skipping 10 matching lines @@
 }
 
 void Fullscreen::didExitFullScreenForElement()
 {
     if (!m_fullScreenElement)
         return;
 
     if (!document()->isActive())
         return;
 
+    document()->removeFromTopLayer(m_fullScreenElement.get());
     m_fullScreenElement->willStopBeingFullscreenElement();
 
     if (m_forCrossProcessAncestor)
         m_fullScreenElement->setContainsFullScreenElement(false);
 
     m_fullScreenElement->setContainsFullScreenElementOnAncestorsCrossingFrameBoundaries(false);
 
-    if (m_fullScreenLayoutObject)
-        LayoutFullScreenItem(m_fullScreenLayoutObject).unwrapLayoutObject();
-
+    // TODO(foolip): redundant with something the top layer machinery does?
     document()->styleEngine().ensureFullscreenUAStyle();
     m_fullScreenElement->pseudoStateChanged(CSSSelector::PseudoFullScreen);
     m_fullScreenElement = nullptr;
 
     if (document()->frame())
         document()->frame()->eventHandler().scheduleHoverStateUpdate();
 
     // When fullyExitFullscreen is called, we call exitFullscreen on the topDocument(). That means
     // that the events will be queued there. So if we have no events here, start the timer on the
     // exiting document.
     Document* exitingDocument = document();
     if (m_eventQueue.isEmpty())
         exitingDocument = &topmostLocalAncestor(*document());
     DCHECK(exitingDocument);
     from(*exitingDocument).m_eventQueueTimer.startOneShot(0, BLINK_FROM_HERE);
 
     m_forCrossProcessAncestor = false;
 }
 
-void Fullscreen::setFullScreenLayoutObject(LayoutFullScreen* layoutObject)
+void Fullscreen::didUpdateSize(Element& element)
 {
-    if (layoutObject == m_fullScreenLayoutObject)
-        return;
-
-    if (layoutObject && m_savedPlaceholderComputedStyle) {
-        layoutObject->createPlaceholder(m_savedPlaceholderComputedStyle.release(), m_savedPlaceholderFrameRect);
-    } else if (layoutObject && m_fullScreenLayoutObject && m_fullScreenLayoutObject->placeholder()) {
-        LayoutBlockFlow* placeholder = m_fullScreenLayoutObject->placeholder();
-        layoutObject->createPlaceholder(ComputedStyle::clone(placeholder->styleRef()), placeholder->frameRect());
-    }
-
-    if (m_fullScreenLayoutObject)
-        m_fullScreenLayoutObject->unwrapLayoutObject();
-    DCHECK(!m_fullScreenLayoutObject);
-
-    m_fullScreenLayoutObject = layoutObject;
-}
-
-void Fullscreen::fullScreenLayoutObjectDestroyed()
-{
-    m_fullScreenLayoutObject = nullptr;
+    // StyleAdjuster will set the size so we need to do a style recalc.
+    // Normally changing size means layout so just doing a style recalc is a
+    // bit surprising.
+    element.setNeedsStyleRecalc(LocalStyleChange, StyleChangeReasonForTracing::create(StyleChangeReason::FullScreen));
 }
 
 void Fullscreen::enqueueChangeEvent(Document& document, RequestType requestType)
 {
     Event* event;
     if (requestType == UnprefixedRequest) {
         event = createEvent(EventTypeNames::fullscreenchange, document);
     } else {
         DCHECK(document.hasFullscreenSupplement());
         Fullscreen& fullscreen = from(document);
@@ skipping 64 matching lines @@
 void Fullscreen::clearFullscreenElementStack()
 {
     m_fullScreenElementStack.clear();
 }
 
 void Fullscreen::popFullscreenElementStack()
 {
     if (m_fullScreenElementStack.isEmpty())
         return;
 
+    document()->removeFromTopLayer(m_fullScreenElementStack.last().first.get());
     m_fullScreenElementStack.removeLast();
 }
 
 void Fullscreen::pushFullscreenElementStack(Element& element, RequestType requestType)
 {
     m_fullScreenElementStack.append(std::make_pair(&element, requestType));
+    document()->addToTopLayer(&element);
 }
 
 DEFINE_TRACE(Fullscreen)
 {
     visitor->trace(m_fullScreenElement);
     visitor->trace(m_fullScreenElementStack);
     visitor->trace(m_eventQueue);
     Supplement<Document>::trace(visitor);
     ContextLifecycleObserver::trace(visitor);
 }
 
 } // namespace blink