webview.cpp

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WebKit

/*
 * Copyright (C) 2006, 2007, 2008 Apple, Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#include "config.h"
#include "WebKitDLL.h"
#include "WebView.h"

#include "CFDictionaryPropertyBag.h"
#include "DOMCoreClasses.h"
#include "MarshallingHelpers.h"
#include "WebDatabaseManager.h"
#include "WebDocumentLoader.h"
#include "WebEditorClient.h"
#include "WebElementPropertyBag.h"
#include "WebFrame.h"
#include "WebBackForwardList.h"
#include "WebChromeClient.h"
#include "WebContextMenuClient.h"
#include "WebCoreTextRenderer.h"
#include "WebDragClient.h"
#include "WebIconDatabase.h"
#include "WebInspector.h"
#include "WebInspectorClient.h"
#include "WebKit.h"
#include "WebKitStatisticsPrivate.h"
#include "WebKitSystemBits.h"
#include "WebMutableURLRequest.h"
#include "WebNotificationCenter.h"
#include "WebPreferences.h"
#pragma warning( push, 0 )
#include <CoreGraphics/CGContext.h>
#include <WebCore/ApplicationCacheStorage.h>
#include <WebCore/AXObjectCache.h>
#include <WebCore/BString.h>
#include <WebCore/Cache.h>
#include <WebCore/ContextMenu.h>
#include <WebCore/ContextMenuController.h>
#include <WebCore/CookieStorageWin.h>
#include <WebCore/CString.h>
#include <WebCore/Cursor.h>
#include <WebCore/Document.h>
#include <WebCore/DragController.h>
#include <WebCore/DragData.h>
#include <WebCore/Editor.h>
#include <WebCore/EventHandler.h>
#include <WebCore/EventNames.h>
#include <WebCore/FileSystem.h>
#include <WebCore/FocusController.h>
#include <WebCore/FloatQuad.h>
#include <WebCore/FrameLoader.h>
#include <WebCore/FrameTree.h>
#include <WebCore/FrameView.h>
#include <WebCore/FrameWin.h>
#include <WebCore/GDIObjectCounter.h>
#include <WebCore/GraphicsContext.h>
#include <WebCore/HistoryItem.h>
#include <WebCore/HitTestResult.h>
#include <WebCore/IntRect.h>
#include <WebCore/KeyboardEvent.h>
#include <WebCore/Language.h>
#include <WebCore/MIMETypeRegistry.h>
#include <WebCore/NotImplemented.h>
#include <WebCore/Page.h>
#include <WebCore/PageCache.h>
#include <WebCore/PlatformKeyboardEvent.h>
#include <WebCore/PlatformMouseEvent.h>
#include <WebCore/PlatformWheelEvent.h>
#include <WebCore/PluginDatabase.h>
#include <WebCore/PluginInfoStore.h>
#include <WebCore/PluginView.h>
#include <WebCore/ProgressTracker.h>
#include <WebCore/RenderTheme.h>
#include <WebCore/ResourceHandle.h>
#include <WebCore/ResourceHandleClient.h>
#include <WebCore/ScriptValue.h>
#include <WebCore/ScrollbarTheme.h>
#include <WebCore/SelectionController.h>
#include <WebCore/Settings.h>
#include <WebCore/SimpleFontData.h>
#include <WebCore/TypingCommand.h>
#include <WebCore/WindowMessageBroadcaster.h>
#pragma warning(pop)
#include <JavaScriptCore/InitializeThreading.h>
#include <JavaScriptCore/JSLock.h>
#include <JavaScriptCore/JSValue.h>
#include <CFNetwork/CFURLCachePriv.h>
#include <CFNetwork/CFURLProtocolPriv.h>
#include <CoreFoundation/CoreFoundation.h>
#include <WebKitSystemInterface/WebKitSystemInterface.h> 
#include <wtf/HashSet.h>
#include <dimm.h>
#include <oleacc.h>
#include <ShlObj.h>
#include <tchar.h>
#include <windowsx.h>

using namespace WebCore;
using JSC::JSLock;
using std::min;
using std::max;

static HMODULE accessibilityLib;
static HashSet<WebView*> pendingDeleteBackingStoreSet;

static String osVersion();
static String webKitVersion();

WebView* kit(Page* page)
{
    return page ? static_cast<WebChromeClient*>(page->chrome()->client())->webView() : 0;
}

class PreferencesChangedOrRemovedObserver : public IWebNotificationObserver {
public:
    static PreferencesChangedOrRemovedObserver* sharedInstance();

private:
    PreferencesChangedOrRemovedObserver() {}
    ~PreferencesChangedOrRemovedObserver() {}

    virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID, void**) { return E_FAIL; }
    virtual ULONG STDMETHODCALLTYPE AddRef(void) { return 0; }
    virtual ULONG STDMETHODCALLTYPE Release(void) { return 0; }

public:
    // IWebNotificationObserver
    virtual HRESULT STDMETHODCALLTYPE onNotify( 
        /* [in] */ IWebNotification* notification);

private:
    HRESULT notifyPreferencesChanged(WebCacheModel);
    HRESULT notifyPreferencesRemoved(WebCacheModel);
};

PreferencesChangedOrRemovedObserver* PreferencesChangedOrRemovedObserver::sharedInstance()
{
    static PreferencesChangedOrRemovedObserver* shared = new PreferencesChangedOrRemovedObserver;
    return shared;
}

HRESULT PreferencesChangedOrRemovedObserver::onNotify(IWebNotification* notification)
{
    HRESULT hr = S_OK;

    COMPtr<IUnknown> unkPrefs;
    hr = notification->getObject(&unkPrefs);
    if (FAILED(hr))
        return hr;

    COMPtr<IWebPreferences> preferences(Query, unkPrefs);
    if (!preferences)
        return E_NOINTERFACE;

    WebCacheModel cacheModel;
    hr = preferences->cacheModel(&cacheModel);
    if (FAILED(hr))
        return hr;

    BSTR nameBSTR;
    hr = notification->name(&nameBSTR);
    if (FAILED(hr))
        return hr;
    BString name;
    name.adoptBSTR(nameBSTR);

    if (wcscmp(name, WebPreferences::webPreferencesChangedNotification()) == 0)
        return notifyPreferencesChanged(cacheModel);

    if (wcscmp(name, WebPreferences::webPreferencesRemovedNotification()) == 0)
        return notifyPreferencesRemoved(cacheModel);

    ASSERT_NOT_REACHED();
    return E_FAIL;
}

HRESULT PreferencesChangedOrRemovedObserver::notifyPreferencesChanged(WebCacheModel cacheModel)
{
    HRESULT hr = S_OK;

    if (!WebView::didSetCacheModel() || cacheModel > WebView::cacheModel())
        WebView::setCacheModel(cacheModel);
    else if (cacheModel < WebView::cacheModel()) {
        WebCacheModel sharedPreferencesCacheModel;
        hr = WebPreferences::sharedStandardPreferences()->cacheModel(&sharedPreferencesCacheModel);
        if (FAILED(hr))
            return hr;
        WebView::setCacheModel(max(sharedPreferencesCacheModel, WebView::maxCacheModelInAnyInstance()));
    }

    return hr;
}

HRESULT PreferencesChangedOrRemovedObserver::notifyPreferencesRemoved(WebCacheModel cacheModel)
{
    HRESULT hr = S_OK;

    if (cacheModel == WebView::cacheModel()) {
        WebCacheModel sharedPreferencesCacheModel;
        hr = WebPreferences::sharedStandardPreferences()->cacheModel(&sharedPreferencesCacheModel);
        if (FAILED(hr))
            return hr;
        WebView::setCacheModel(max(sharedPreferencesCacheModel, WebView::maxCacheModelInAnyInstance()));
    }

    return hr;
}


const LPCWSTR kWebViewWindowClassName = L"WebViewWindowClass";

const int WM_XP_THEMECHANGED = 0x031A;
const int WM_VISTA_MOUSEHWHEEL = 0x020E;

static const int maxToolTipWidth = 250;

static const int delayBeforeDeletingBackingStoreMsec = 5000;

static ATOM registerWebView();
static LRESULT CALLBACK WebViewWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);

static void initializeStaticObservers();

static HRESULT updateSharedSettingsFromPreferencesIfNeeded(IWebPreferences*);

HRESULT createMatchEnumerator(Vector<IntRect>* rects, IEnumTextMatches** matches);

static bool continuousSpellCheckingEnabled;
static bool grammarCheckingEnabled;

static bool s_didSetCacheModel;
static WebCacheModel s_cacheModel = WebCacheModelDocumentViewer;

enum {
    UpdateActiveStateTimer = 1,
    DeleteBackingStoreTimer = 2,
};

// WebView ----------------------------------------------------------------

bool WebView::s_allowSiteSpecificHacks = false;

WebView::WebView()
: m_refCount(0)
, m_hostWindow(0)
, m_viewWindow(0)
, m_mainFrame(0)
, m_page(0)
, m_hasCustomDropTarget(false)
, m_useBackForwardList(true)
, m_userAgentOverridden(false)
, m_zoomMultiplier(1.0f)
, m_mouseActivated(false)
, m_dragData(0)
, m_currentCharacterCode(0)
, m_isBeingDestroyed(false)
, m_paintCount(0)
, m_hasSpellCheckerDocumentTag(false)
, m_smartInsertDeleteEnabled(false)
, m_didClose(false)
, m_inIMEComposition(0)
, m_toolTipHwnd(0)
, m_closeWindowTimer(this, &WebView::closeWindowTimerFired)
, m_topLevelParent(0)
, m_deleteBackingStoreTimerActive(false)
, m_transparent(false)
, m_selectTrailingWhitespaceEnabled(false)
{
    JSC::initializeThreading();

    m_backingStoreSize.cx = m_backingStoreSize.cy = 0;

    CoCreateInstance(CLSID_DragDropHelper, 0, CLSCTX_INPROC_SERVER, IID_IDropTargetHelper,(void**)&m_dropTargetHelper);

    initializeStaticObservers();

    WebPreferences* sharedPreferences = WebPreferences::sharedStandardPreferences();
    BOOL enabled;
    if (SUCCEEDED(sharedPreferences->continuousSpellCheckingEnabled(&enabled)))
        continuousSpellCheckingEnabled = !!enabled;
    if (SUCCEEDED(sharedPreferences->grammarCheckingEnabled(&enabled)))
        grammarCheckingEnabled = !!enabled;

    WebViewCount++;
    gClassCount++;
    gClassNameCount.add("WebView");
}

WebView::~WebView()
{
    deleteBackingStore();

    // <rdar://4958382> m_viewWindow will be destroyed when m_hostWindow is destroyed, but if
    // setHostWindow was never called we will leak our HWND. If we still have a valid HWND at
    // this point, we should just destroy it ourselves.
    if (!isBeingDestroyed() && ::IsWindow(m_viewWindow))
        ::DestroyWindow(m_viewWindow);

    // the tooltip window needs to be explicitly destroyed since it isn't a WS_CHILD
    if (::IsWindow(m_toolTipHwnd))
        ::DestroyWindow(m_toolTipHwnd);

    ASSERT(!m_page);
    ASSERT(!m_preferences);

    WebViewCount--;
    gClassCount--;
    gClassNameCount.remove("WebView");
}

WebView* WebView::createInstance()
{
    WebView* instance = new WebView();
    instance->AddRef();
    return instance;
}

void initializeStaticObservers()
{
    static bool initialized;
    if (initialized)
        return;
    initialized = true;

    IWebNotificationCenter* notifyCenter = WebNotificationCenter::defaultCenterInternal();
    notifyCenter->addObserver(PreferencesChangedOrRemovedObserver::sharedInstance(), WebPreferences::webPreferencesChangedNotification(), 0);
    notifyCenter->addObserver(PreferencesChangedOrRemovedObserver::sharedInstance(), WebPreferences::webPreferencesRemovedNotification(), 0);
}

static HashSet<WebView*>& allWebViewsSet()
{
    static HashSet<WebView*> allWebViewsSet;
    return allWebViewsSet;
}

void WebView::addToAllWebViewsSet()
{
    allWebViewsSet().add(this);
}

void WebView::removeFromAllWebViewsSet()
{
    allWebViewsSet().remove(this);