page.cpp

来自「linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自Web」· C++ 代码 · 共 653 行 · 第 1/2 页

/*
 * Copyright (C) 2006, 2007, 2008 Apple Inc. All Rights Reserved.
 * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
 *
 * 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 "Page.h"

#include "Chrome.h"
#include "ChromeClient.h"
#include "ContextMenuClient.h"
#include "ContextMenuController.h"
#include "CSSStyleSelector.h"
#include "EditorClient.h"
#include "DOMWindow.h"
#include "DragController.h"
#include "EventNames.h"
#include "FileSystem.h"
#include "FocusController.h"
#include "Frame.h"
#include "FrameLoader.h"
#include "FrameTree.h"
#include "FrameView.h"
#include "HistoryItem.h"
#include "InspectorController.h"
#include "Logging.h"
#include "NetworkStateNotifier.h"
#include "Navigator.h"
#include "PageGroup.h"
#include "PluginData.h"
#include "ProgressTracker.h"
#include "RenderWidget.h"
#include "SelectionController.h"
#include "Settings.h"
#include "StringHash.h"
#include "TextResourceDecoder.h"
#include "Widget.h"
#include "ScriptController.h"
#include <wtf/HashMap.h>
#include <wtf/RefCountedLeakCounter.h>
#include <wtf/StdLibExtras.h>

#if ENABLE(DOM_STORAGE)
#include "LocalStorage.h"
#include "SessionStorage.h"
#include "StorageArea.h"
#endif

#if ENABLE(JAVASCRIPT_DEBUGGER)
#include "JavaScriptDebugServer.h"
#endif

#if ENABLE(WML)
#include "WMLPageState.h"
#endif

namespace WebCore {

static HashSet<Page*>* allPages;

#ifndef NDEBUG
static WTF::RefCountedLeakCounter pageCounter("Page");
#endif

static void networkStateChanged()
{
    Vector<RefPtr<Frame> > frames;
    
    // Get all the frames of all the pages in all the page groups
    HashSet<Page*>::iterator end = allPages->end();
    for (HashSet<Page*>::iterator it = allPages->begin(); it != end; ++it) {
        for (Frame* frame = (*it)->mainFrame(); frame; frame = frame->tree()->traverseNext())
            frames.append(frame);
    }

    AtomicString eventName = networkStateNotifier().onLine() ? eventNames().onlineEvent : eventNames().offlineEvent;
    
    for (unsigned i = 0; i < frames.size(); i++) {
        Document* document = frames[i]->document();
        
        // If the document does not have a body the event should be dispatched to the document
        Node* eventTarget = document->body();
        if (!eventTarget)
            eventTarget = document;
        
        eventTarget->dispatchEventForType(eventName, false, false);
    }
}

Page::Page(ChromeClient* chromeClient, ContextMenuClient* contextMenuClient, EditorClient* editorClient, DragClient* dragClient, InspectorClient* inspectorClient)
    : m_chrome(new Chrome(this, chromeClient))
    , m_dragCaretController(new SelectionController(0, true))
    , m_dragController(new DragController(this, dragClient))
    , m_focusController(new FocusController(this))
    , m_contextMenuController(new ContextMenuController(this, contextMenuClient))
    , m_inspectorController(InspectorController::create(this, inspectorClient))
    , m_settings(new Settings(this))
    , m_progress(new ProgressTracker)
    , m_backForwardList(BackForwardList::create(this))
    , m_editorClient(editorClient)
    , m_frameCount(0)
    , m_tabKeyCyclesThroughElements(true)
    , m_defersLoading(false)
    , m_inLowQualityInterpolationMode(false)
    , m_cookieEnabled(true)
    , m_areMemoryCacheClientCallsEnabled(true)
    , m_mediaVolume(1)
    , m_javaScriptURLsAreAllowed(true)
    , m_parentInspectorController(0)
    , m_didLoadUserStyleSheet(false)
    , m_userStyleSheetModificationTime(0)
    , m_group(0)
    , m_debugger(0)
    , m_pendingUnloadEventCount(0)
    , m_pendingBeforeUnloadEventCount(0)
    , m_customHTMLTokenizerTimeDelay(-1)
    , m_customHTMLTokenizerChunkSize(-1)
{
    if (!allPages) {
        allPages = new HashSet<Page*>;
        
        networkStateNotifier().setNetworkStateChangedFunction(networkStateChanged);
    }

    ASSERT(!allPages->contains(this));
    allPages->add(this);

#if ENABLE(JAVASCRIPT_DEBUGGER)
    JavaScriptDebugServer::shared().pageCreated(this);
#endif

#ifndef NDEBUG
    pageCounter.increment();
#endif
}

Page::~Page()
{
    m_mainFrame->setView(0);
    setGroupName(String());
    allPages->remove(this);
    
    for (Frame* frame = mainFrame(); frame; frame = frame->tree()->traverseNext())
        frame->pageDestroyed();

    m_editorClient->pageDestroyed();
    if (m_parentInspectorController)
        m_parentInspectorController->pageDestroyed();
    m_inspectorController->inspectedPageDestroyed();

    m_backForwardList->close();

#ifndef NDEBUG
    pageCounter.decrement();

    // Cancel keepAlive timers, to ensure we release all Frames before exiting.
    // It's safe to do this because we prohibit closing a Page while JavaScript
    // is executing.
    Frame::cancelAllKeepAlive();
#endif
}

void Page::setMainFrame(PassRefPtr<Frame> mainFrame)
{
    ASSERT(!m_mainFrame); // Should only be called during initialization
    m_mainFrame = mainFrame;
}

BackForwardList* Page::backForwardList()
{
    return m_backForwardList.get();
}

bool Page::goBack()
{
    HistoryItem* item = m_backForwardList->backItem();
    
    if (item) {
        goToItem(item, FrameLoadTypeBack);
        return true;
    }
    return false;
}

bool Page::goForward()
{
    HistoryItem* item = m_backForwardList->forwardItem();
    
    if (item) {
        goToItem(item, FrameLoadTypeForward);
        return true;
    }
    return false;
}

void Page::goToItem(HistoryItem* item, FrameLoadType type)
{
    // Abort any current load if we're going to a history item
    m_mainFrame->loader()->stopAllLoaders();
    m_mainFrame->loader()->goToItem(item, type);
}

void Page::setGlobalHistoryItem(HistoryItem* item)
{
    m_globalHistoryItem = item;
}

void Page::setGroupName(const String& name)
{
    if (m_group && !m_group->name().isEmpty()) {
        ASSERT(m_group != m_singlePageGroup.get());
        ASSERT(!m_singlePageGroup);
        m_group->removePage(this);
    }

    if (name.isEmpty())
        m_group = m_singlePageGroup.get();
    else {
        m_singlePageGroup.clear();
        m_group = PageGroup::pageGroup(name);
        m_group->addPage(this);
    }
}

const String& Page::groupName() const
{
    DEFINE_STATIC_LOCAL(String, nullString, ());
    return m_group ? m_group->name() : nullString;
}

void Page::initGroup()
{
    ASSERT(!m_singlePageGroup);
    ASSERT(!m_group);
    m_singlePageGroup.set(new PageGroup(this));
    m_group = m_singlePageGroup.get();
}

void Page::setNeedsReapplyStyles()
{
    if (!allPages)
        return;
    HashSet<Page*>::iterator end = allPages->end();
    for (HashSet<Page*>::iterator it = allPages->begin(); it != end; ++it)
        for (Frame* frame = (*it)->mainFrame(); frame; frame = frame->tree()->traverseNext())
            frame->setNeedsReapplyStyles();
}

void Page::refreshPlugins(bool reload)
{
    if (!allPages)
        return;

    PluginData::refresh();

    Vector<RefPtr<Frame> > framesNeedingReload;

    HashSet<Page*>::iterator end = allPages->end();
    for (HashSet<Page*>::iterator it = allPages->begin(); it != end; ++it) {
        (*it)->m_pluginData = 0;

        if (reload) {
            for (Frame* frame = (*it)->mainFrame(); frame; frame = frame->tree()->traverseNext()) {
                if (frame->loader()->containsPlugins())
                    framesNeedingReload.append(frame);
            }
        }
    }

    for (size_t i = 0; i < framesNeedingReload.size(); ++i)
        framesNeedingReload[i]->loader()->reload();
}

PluginData* Page::pluginData() const
{
    if (!settings()->arePluginsEnabled())
        return 0;
    if (!m_pluginData)
        m_pluginData = PluginData::create(this);
    return m_pluginData.get();
}

static Frame* incrementFrame(Frame* curr, bool forward, bool wrapFlag)
{
    return forward
        ? curr->tree()->traverseNextWithWrap(wrapFlag)
        : curr->tree()->traversePreviousWithWrap(wrapFlag);
}

bool Page::findString(const String& target, TextCaseSensitivity caseSensitivity, FindDirection direction, bool shouldWrap)
{
    if (target.isEmpty() || !mainFrame())
        return false;

    Frame* frame = focusController()->focusedOrMainFrame();
    Frame* startFrame = frame;
    do {
        if (frame->findString(target, direction == FindDirectionForward, caseSensitivity == TextCaseSensitive, false, true)) {
            if (frame != startFrame)
                startFrame->selection()->clear();
            focusController()->setFocusedFrame(frame);
            return true;
        }
        frame = incrementFrame(frame, direction == FindDirectionForward, shouldWrap);
    } while (frame && frame != startFrame);

    // Search contents of startFrame, on the other side of the selection that we did earlier.
    // We cheat a bit and just research with wrap on
    if (shouldWrap && !startFrame->selection()->isNone()) {
        bool found = startFrame->findString(target, direction == FindDirectionForward, caseSensitivity == TextCaseSensitive, true, true);
        focusController()->setFocusedFrame(frame);
        return found;