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      1 /*
      2  * Copyright (C) 2006, 2007, 2009 Apple Inc. All rights reserved.
      3  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
      4  *
      5  * This library is free software; you can redistribute it and/or
      6  * modify it under the terms of the GNU Library General Public
      7  * License as published by the Free Software Foundation; either
      8  * version 2 of the License, or (at your option) any later version.
      9  *
     10  * This library is distributed in the hope that it will be useful,
     11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13  * Library General Public License for more details.
     14  *
     15  * You should have received a copy of the GNU Library General Public License
     16  * along with this library; see the file COPYING.LIB.  If not, write to
     17  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     18  * Boston, MA 02110-1301, USA.
     19  */
     20 
     21 #include "config.h"
     22 #include "core/page/ScopedPageLoadDeferrer.h"
     23 
     24 #include "core/dom/Document.h"
     25 #include "core/frame/LocalFrame.h"
     26 #include "core/loader/FrameLoader.h"
     27 #include "core/page/Page.h"
     28 #include "wtf/HashSet.h"
     29 
     30 namespace blink {
     31 
     32 ScopedPageLoadDeferrer::ScopedPageLoadDeferrer(Page* exclusion)
     33 {
     34     const HashSet<Page*>& pages = Page::ordinaryPages();
     35 
     36     HashSet<Page*>::const_iterator end = pages.end();
     37     for (HashSet<Page*>::const_iterator it = pages.begin(); it != end; ++it) {
     38         Page* page = *it;
     39         if (page == exclusion || page->defersLoading())
     40             continue;
     41 
     42         if (page->mainFrame()->isLocalFrame()) {
     43             m_deferredFrames.append(page->deprecatedLocalMainFrame());
     44 
     45             // Ensure that we notify the client if the initial empty document is accessed before
     46             // showing anything modal, to prevent spoofs while the modal window or sheet is visible.
     47             page->deprecatedLocalMainFrame()->loader().notifyIfInitialDocumentAccessed();
     48         }
     49 
     50         // This code is not logically part of load deferring, but we do not want JS code executed
     51         // beneath modal windows or sheets, which is exactly when ScopedPageLoadDeferrer is used.
     52         for (Frame* frame = page->mainFrame(); frame; frame = frame->tree().traverseNext()) {
     53             if (frame->isLocalFrame())
     54                 toLocalFrame(frame)->document()->suspendScheduledTasks();
     55         }
     56     }
     57 
     58     size_t count = m_deferredFrames.size();
     59     for (size_t i = 0; i < count; ++i) {
     60         if (Page* page = m_deferredFrames[i]->page())
     61             page->setDefersLoading(true);
     62     }
     63 }
     64 
     65 void ScopedPageLoadDeferrer::detach()
     66 {
     67     for (size_t i = 0; i < m_deferredFrames.size(); ++i) {
     68         if (Page* page = m_deferredFrames[i]->page()) {
     69             page->setDefersLoading(false);
     70 
     71             for (Frame* frame = page->mainFrame(); frame; frame = frame->tree().traverseNext()) {
     72                 if (frame->isLocalFrame())
     73                     toLocalFrame(frame)->document()->resumeScheduledTasks();
     74             }
     75         }
     76     }
     77 }
     78 
     79 #if ENABLE(OILPAN)
     80 void ScopedPageLoadDeferrer::dispose()
     81 {
     82     detach();
     83     m_deferredFrames.clear();
     84 }
     85 #endif
     86 
     87 ScopedPageLoadDeferrer::~ScopedPageLoadDeferrer()
     88 {
     89     detach();
     90 }
     91 
     92 void ScopedPageLoadDeferrer::trace(Visitor* visitor)
     93 {
     94 #if ENABLE(OILPAN)
     95     visitor->trace(m_deferredFrames);
     96 #endif
     97 }
     98 
     99 } // namespace blink
    100