Merge WebKit at r75315: Initial merge by git.

Change-Id: I570314b346ce101c935ed22a626b48c2af266b84

1 files changed, 83 insertions, 0 deletions

diff --git a/Source/WebCore/page/PageGroupLoadDeferrer.cpp b/Source/WebCore/page/PageGroupLoadDeferrer.cpp
new file mode 100644
index 0000000..781bc34
--- /dev/null
+++ b/Source/WebCore/page/PageGroupLoadDeferrer.cpp
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2006, 2007, 2009 Apple Inc. All rights reserved.
+ * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
+ *
+ * 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 "config.h"
+#include "PageGroupLoadDeferrer.h"
+
+#include "AsyncScriptRunner.h"
+#include "DocumentParser.h"
+#include "Frame.h"
+#include "Page.h"
+#include "PageGroup.h"
+#include <wtf/HashSet.h>
+
+namespace WebCore {
+
+using namespace std;
+
+PageGroupLoadDeferrer::PageGroupLoadDeferrer(Page* page, bool deferSelf)
+{
+    const HashSet<Page*>& pages = page->group().pages();
+
+    HashSet<Page*>::const_iterator end = pages.end();
+    for (HashSet<Page*>::const_iterator it = pages.begin(); it != end; ++it) {
+        Page* otherPage = *it;
+        if ((deferSelf || otherPage != page)) {
+            if (!otherPage->defersLoading()) {
+                m_deferredFrames.append(otherPage->mainFrame());
+
+                // This code is not logically part of load deferring, but we do not want JS code executed beneath modal
+                // windows or sheets, which is exactly when PageGroupLoadDeferrer is used.
+                // NOTE: if PageGroupLoadDeferrer is ever used for tasks other than showing a modal window or sheet,
+                // the constructor will need to take a ActiveDOMObject::ReasonForSuspension.
+                for (Frame* frame = otherPage->mainFrame(); frame; frame = frame->tree()->traverseNext()) {
+                    frame->document()->suspendActiveDOMObjects(ActiveDOMObject::WillShowDialog);
+                    frame->document()->asyncScriptRunner()->suspend();
+                    if (DocumentParser* parser = frame->document()->parser())
+                        parser->suspendScheduledTasks();
+                }
+            }
+        }
+    }
+
+    size_t count = m_deferredFrames.size();
+    for (size_t i = 0; i < count; ++i)
+        if (Page* page = m_deferredFrames[i]->page())
+            page->setDefersLoading(true);
+}
+
+PageGroupLoadDeferrer::~PageGroupLoadDeferrer()
+{
+    for (size_t i = 0; i < m_deferredFrames.size(); ++i) {
+        if (Page* page = m_deferredFrames[i]->page()) {
+            page->setDefersLoading(false);
+
+            for (Frame* frame = page->mainFrame(); frame; frame = frame->tree()->traverseNext()) {
+                frame->document()->resumeActiveDOMObjects();
+                frame->document()->asyncScriptRunner()->resume();
+                if (DocumentParser* parser = frame->document()->parser())
+                    parser->resumeScheduledTasks();
+            }
+        }
+    }
+}
+
+
+} // namespace WebCore