webview.mm

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

    WebNodeHighlight *currentNodeHighlight;

    BOOL allowsUndo;
        
    float zoomMultiplier;

    NSString *applicationNameForUserAgent;
    String userAgent;
    BOOL userAgentOverridden;
    
    WebPreferences *preferences;
    BOOL useSiteSpecificSpoofing;

    NSWindow *hostWindow;

    int programmaticFocusCount;
    
    WebResourceDelegateImplementationCache resourceLoadDelegateImplementations;
    WebFrameLoadDelegateImplementationCache frameLoadDelegateImplementations;
    WebScriptDebugDelegateImplementationCache scriptDebugDelegateImplementations;

    void *observationInfo;
    
    BOOL closed;
    BOOL shouldCloseWithWindow;
    BOOL mainFrameDocumentReady;
    BOOL drawsBackground;
    BOOL editable;
    BOOL tabKeyCyclesThroughElementsChanged;
    BOOL becomingFirstResponder;
    BOOL becomingFirstResponderFromOutside;
    BOOL hoverFeedbackSuspended;
    BOOL usesPageCache;
    BOOL catchesDelegateExceptions;

    NSColor *backgroundColor;

    NSString *mediaStyle;
    
    BOOL hasSpellCheckerDocumentTag;
    NSInteger spellCheckerDocumentTag;

    BOOL smartInsertDeleteEnabled;
    BOOL selectTrailingWhitespaceEnabled;
        
#if ENABLE(DASHBOARD_SUPPORT)
    BOOL dashboardBehaviorAlwaysSendMouseEventsToAllWindows;
    BOOL dashboardBehaviorAlwaysSendActiveNullEventsToPlugIns;
    BOOL dashboardBehaviorAlwaysAcceptsFirstMouse;
    BOOL dashboardBehaviorAllowWheelScrolling;
#endif
    
    // WebKit has both a global plug-in database and a separate, per WebView plug-in database. Dashboard uses the per WebView database.
    WebPluginDatabase *pluginDatabase;
    
    HashMap<unsigned long, RetainPtr<id> > identifierMap;

    BOOL _keyboardUIModeAccessed;
    KeyboardUIMode _keyboardUIMode;

    BOOL shouldUpdateWhileOffscreen;
    
    // When this flag is set, we will not make any subviews underneath this WebView.  This means no WebFrameViews and no WebHTMLViews.
    BOOL useDocumentViews;

#if USE(ACCELERATED_COMPOSITING)
    // When this flag is set, next time a WebHTMLView draws, it needs to temporarily disable screen updates
    // so that the NSView drawing is visually synchronized with CALayer updates.
    BOOL needsOneShotDrawingSynchronization;
    // Number of WebHTMLViews using accelerated compositing. Used to implement _isUsingAcceleratedCompositing.
    int acceleratedFramesCount;
#endif    
}
@end

@interface WebView (WebFileInternal)
- (WebFrame *)_selectedOrMainFrame;
- (BOOL)_isLoading;
- (WebFrameView *)_frameViewAtWindowPoint:(NSPoint)point;
- (WebFrame *)_focusedFrame;
+ (void)_preflightSpellChecker;
- (BOOL)_continuousCheckingAllowed;
- (NSResponder *)_responderForResponderOperations;
@end

@interface WebView (WebCallDelegateFunctions)
@end

static void patchMailRemoveAttributesMethod();

NSString *WebElementDOMNodeKey =            @"WebElementDOMNode";
NSString *WebElementFrameKey =              @"WebElementFrame";
NSString *WebElementImageKey =              @"WebElementImage";
NSString *WebElementImageAltStringKey =     @"WebElementImageAltString";
NSString *WebElementImageRectKey =          @"WebElementImageRect";
NSString *WebElementImageURLKey =           @"WebElementImageURL";
NSString *WebElementIsSelectedKey =         @"WebElementIsSelected";
NSString *WebElementLinkLabelKey =          @"WebElementLinkLabel";
NSString *WebElementLinkTargetFrameKey =    @"WebElementTargetFrame";
NSString *WebElementLinkTitleKey =          @"WebElementLinkTitle";
NSString *WebElementLinkURLKey =            @"WebElementLinkURL";
NSString *WebElementSpellingToolTipKey =    @"WebElementSpellingToolTip";
NSString *WebElementTitleKey =              @"WebElementTitle";
NSString *WebElementLinkIsLiveKey =         @"WebElementLinkIsLive";
NSString *WebElementIsContentEditableKey =  @"WebElementIsContentEditableKey";

NSString *WebViewProgressStartedNotification =          @"WebProgressStartedNotification";
NSString *WebViewProgressEstimateChangedNotification =  @"WebProgressEstimateChangedNotification";
NSString *WebViewProgressFinishedNotification =         @"WebProgressFinishedNotification";

NSString * const WebViewDidBeginEditingNotification =         @"WebViewDidBeginEditingNotification";
NSString * const WebViewDidChangeNotification =               @"WebViewDidChangeNotification";
NSString * const WebViewDidEndEditingNotification =           @"WebViewDidEndEditingNotification";
NSString * const WebViewDidChangeTypingStyleNotification =    @"WebViewDidChangeTypingStyleNotification";
NSString * const WebViewDidChangeSelectionNotification =      @"WebViewDidChangeSelectionNotification";

enum { WebViewVersion = 4 };

#define timedLayoutSize 4096

static NSMutableSet *schemesWithRepresentationsSet;

NSString *_WebCanGoBackKey =            @"canGoBack";
NSString *_WebCanGoForwardKey =         @"canGoForward";
NSString *_WebEstimatedProgressKey =    @"estimatedProgress";
NSString *_WebIsLoadingKey =            @"isLoading";
NSString *_WebMainFrameIconKey =        @"mainFrameIcon";
NSString *_WebMainFrameTitleKey =       @"mainFrameTitle";
NSString *_WebMainFrameURLKey =         @"mainFrameURL";
NSString *_WebMainFrameDocumentKey =    @"mainFrameDocument";

@interface WebProgressItem : NSObject
{
@public
    long long bytesReceived;
    long long estimatedLength;
}
@end

@implementation WebProgressItem
@end

static BOOL continuousSpellCheckingEnabled;
#ifndef BUILDING_ON_TIGER
static BOOL grammarCheckingEnabled;
#endif

@implementation WebViewPrivate

+ (void)initialize
{
    JSC::initializeThreading();
#ifndef BUILDING_ON_TIGER
    WebCoreObjCFinalizeOnMainThread(self);
#endif
}

- init 
{
    self = [super init];
    if (!self)
        return nil;
    JSC::initializeThreading();
    allowsUndo = YES;
    zoomMultiplier = 1;
#if ENABLE(DASHBOARD_SUPPORT)
    dashboardBehaviorAllowWheelScrolling = YES;
#endif
    shouldCloseWithWindow = objc_collecting_enabled();
    continuousSpellCheckingEnabled = [[NSUserDefaults standardUserDefaults] boolForKey:WebContinuousSpellCheckingEnabled];

#ifndef BUILDING_ON_TIGER
    grammarCheckingEnabled = [[NSUserDefaults standardUserDefaults] boolForKey:WebGrammarCheckingEnabled];
#endif
    
    usesPageCache = YES;
    
    pluginDatabaseClientCount++;

    shouldUpdateWhileOffscreen = YES;

    return self;
}

- (void)dealloc
{    
    ASSERT(applicationIsTerminating || !page);
    ASSERT(applicationIsTerminating || !preferences);
    
    [applicationNameForUserAgent release];
    [backgroundColor release];
    
    [inspector release];
    [currentNodeHighlight release];

    [hostWindow release];

    [policyDelegateForwarder release];
    [UIDelegateForwarder release];
    [frameLoadDelegateForwarder release];
    [editingDelegateForwarder release];
    
    [mediaStyle release];
    
    [super dealloc];
}

- (void)finalize
{
    ASSERT_MAIN_THREAD();

    [super finalize];
}

@end

@implementation WebView (AllWebViews)

static CFSetCallBacks NonRetainingSetCallbacks = {
    0,
    NULL,
    NULL,
    CFCopyDescription,
    CFEqual,
    CFHash
};

static CFMutableSetRef allWebViewsSet;

+ (void)_makeAllWebViewsPerformSelector:(SEL)selector
{
    if (!allWebViewsSet)
        return;

    [(NSMutableSet *)allWebViewsSet makeObjectsPerformSelector:selector];
}

- (void)_removeFromAllWebViewsSet
{
    if (allWebViewsSet)
        CFSetRemoveValue(allWebViewsSet, self);
}

- (void)_addToAllWebViewsSet
{
    if (!allWebViewsSet)
        allWebViewsSet = CFSetCreateMutable(NULL, 0, &NonRetainingSetCallbacks);

    CFSetSetValue(allWebViewsSet, self);
}

@end

@implementation WebView (WebPrivate)

static inline int callGestalt(OSType selector)
{
    SInt32 value = 0;
    Gestalt(selector, &value);
    return value;
}

// Uses underscores instead of dots because if "4." ever appears in a user agent string, old DHTML libraries treat it as Netscape 4.
static NSString *createMacOSXVersionString()
{
    // Can't use -[NSProcessInfo operatingSystemVersionString] because it has too much stuff we don't want.
    int major = callGestalt(gestaltSystemVersionMajor);
    ASSERT(major);

    int minor = callGestalt(gestaltSystemVersionMinor);
    int bugFix = callGestalt(gestaltSystemVersionBugFix);
    if (bugFix)
        return [[NSString alloc] initWithFormat:@"%d_%d_%d", major, minor, bugFix];
    if (minor)
        return [[NSString alloc] initWithFormat:@"%d_%d", major, minor];
    return [[NSString alloc] initWithFormat:@"%d", major];
}

static NSString *createUserVisibleWebKitVersionString()
{
    // If the version is 4 digits long or longer, then the first digit represents
    // the version of the OS. Our user agent string should not include this first digit,
    // so strip it off and report the rest as the version. <rdar://problem/4997547>
    NSString *fullVersion = [[NSBundle bundleForClass:[WebView class]] objectForInfoDictionaryKey:(NSString *)kCFBundleVersionKey];
    NSRange nonDigitRange = [fullVersion rangeOfCharacterFromSet:[[NSCharacterSet decimalDigitCharacterSet] invertedSet]];
    if (nonDigitRange.location == NSNotFound && [fullVersion length] >= 4)
        return [[fullVersion substringFromIndex:1] copy];
    if (nonDigitRange.location != NSNotFound && nonDigitRange.location >= 4)
        return [[fullVersion substringFromIndex:1] copy];
    return [fullVersion copy];
}

+ (NSString *)_standardUserAgentWithApplicationName:(NSString *)applicationName
{
    // Note: Do *not* move the initialization of osVersion nor webKitVersion into the declaration.
    // Garbage collection won't correctly mark the global variable in that case <rdar://problem/5733674>.
    static NSString *osVersion;
    static NSString *webKitVersion;
    if (!osVersion)
        osVersion = createMacOSXVersionString();
    if (!webKitVersion)
        webKitVersion = createUserVisibleWebKitVersionString();
    NSString *language = [NSUserDefaults _webkit_preferredLanguageCode];
    if ([applicationName length])
        return [NSString stringWithFormat:@"Mozilla/5.0 (Macintosh; U; " PROCESSOR " Mac OS X %@; %@) AppleWebKit/%@ (KHTML, like Gecko) %@", osVersion, language, webKitVersion, applicationName];
    return [NSString stringWithFormat:@"Mozilla/5.0 (Macintosh; U; " PROCESSOR " Mac OS X %@; %@) AppleWebKit/%@ (KHTML, like Gecko)", osVersion, language, webKitVersion];
}

static void WebKitInitializeApplicationCachePathIfNecessary()
{
    static BOOL initialized = NO;
    if (initialized)
        return;

    NSString *appName = [[NSBundle mainBundle] bundleIdentifier];
    if (!appName)
        appName = [[NSProcessInfo processInfo] processName];
    
    ASSERT(appName);

    NSString* cacheDir = [NSString _webkit_localCacheDirectoryWithBundleIdentifier:appName];

    cacheStorage().setCacheDirectory(cacheDir);
    initialized = YES;
}

- (void)_registerDraggedTypes
{
    NSArray *editableTypes = [WebHTMLView _insertablePasteboardTypes];
    NSArray *URLTypes = [NSPasteboard _web_dragTypesForURL];
    NSMutableSet *types = [[NSMutableSet alloc] initWithArray:editableTypes];
    [types addObjectsFromArray:URLTypes];
    [self registerForDraggedTypes:[types allObjects]];
    [types release];
}

- (BOOL)_usesDocumentViews
{
    return _private->useDocumentViews;
}

- (void)_commonInitializationWithFrameName:(NSString *)frameName groupName:(NSString *)groupName usesDocumentViews:(BOOL)usesDocumentViews
{
    WebCoreThreadViolationCheck();

#ifndef NDEBUG
    WTF::RefCountedLeakCounter::suppressMessages(webViewIsOpen);
#endif
    
    WebPreferences *standardPreferences = [WebPreferences standardPreferences];