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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 "PageGroupLoadDeferrer.h"
     23 
     24 #include "DocumentParser.h"
     25 #include "Frame.h"
     26 #include "Page.h"
     27 #include "PageGroup.h"
     28 #include "ScriptRunner.h"
     29 #include <wtf/HashSet.h>
     30 
     31 namespace WebCore {
     32 
     33 using namespace std;
     34 
     35 PageGroupLoadDeferrer::PageGroupLoadDeferrer(Page* page, bool deferSelf)
     36 {
     37     const HashSet<Page*>& pages = page->group().pages();
     38 
     39     HashSet<Page*>::const_iterator end = pages.end();
     40     for (HashSet<Page*>::const_iterator it = pages.begin(); it != end; ++it) {
     41         Page* otherPage = *it;
     42         if ((deferSelf || otherPage != page)) {
     43             if (!otherPage->defersLoading()) {
     44                 m_deferredFrames.append(otherPage->mainFrame());
     45 
     46                 // This code is not logically part of load deferring, but we do not want JS code executed beneath modal
     47                 // windows or sheets, which is exactly when PageGroupLoadDeferrer is used.
     48                 // NOTE: if PageGroupLoadDeferrer is ever used for tasks other than showing a modal window or sheet,
     49                 // the constructor will need to take a ActiveDOMObject::ReasonForSuspension.
     50                 for (Frame* frame = otherPage->mainFrame(); frame; frame = frame->tree()->traverseNext()) {
     51                     frame->document()->suspendScriptedAnimationControllerCallbacks();
     52                     frame->document()->suspendActiveDOMObjects(ActiveDOMObject::WillShowDialog);
     53                     frame->document()->scriptRunner()->suspend();
     54                     if (DocumentParser* parser = frame->document()->parser())
     55                         parser->suspendScheduledTasks();
     56                 }
     57             }
     58         }
     59     }
     60 
     61     size_t count = m_deferredFrames.size();
     62     for (size_t i = 0; i < count; ++i)
     63         if (Page* page = m_deferredFrames[i]->page())
     64             page->setDefersLoading(true);
     65 }
     66 
     67 PageGroupLoadDeferrer::~PageGroupLoadDeferrer()
     68 {
     69     for (size_t i = 0; i < m_deferredFrames.size(); ++i) {
     70         if (Page* page = m_deferredFrames[i]->page()) {
     71             page->setDefersLoading(false);
     72 
     73             for (Frame* frame = page->mainFrame(); frame; frame = frame->tree()->traverseNext()) {
     74                 frame->document()->resumeActiveDOMObjects();
     75                 frame->document()->resumeScriptedAnimationControllerCallbacks();
     76                 frame->document()->scriptRunner()->resume();
     77                 if (DocumentParser* parser = frame->document()->parser())
     78                     parser->resumeScheduledTasks();
     79             }
     80         }
     81     }
     82 }
     83 
     84 
     85 } // namespace WebCore
     86