C++ EventTarget::toDOMWindow方法代码示例

ScriptPromise ImageBitmapFactories::createImageBitmap(ScriptState* scriptState, EventTarget& eventTarget, HTMLImageElement* image, int sx, int sy, int sw, int sh, ExceptionState& exceptionState)
{
    // This variant does not work in worker threads.
    ASSERT(eventTarget.toDOMWindow());

    if (!image->cachedImage()) {
        exceptionState.throwDOMException(InvalidStateError, "No image can be retrieved from the provided element.");
        return ScriptPromise();
    }
    if (image->cachedImage()->image()->isSVGImage()) {
        exceptionState.throwDOMException(InvalidStateError, "The image element contains an SVG image, which is unsupported.");
        return ScriptPromise();
    }
    if (!sw || !sh) {
        exceptionState.throwDOMException(IndexSizeError, String::format("The source %s provided is 0.", sw ? "height" : "width"));
        return ScriptPromise();
    }
    if (!image->cachedImage()->image()->currentFrameHasSingleSecurityOrigin()) {
        exceptionState.throwSecurityError("The source image contains image data from multiple origins.");
        return ScriptPromise();
    }
    Document* document = eventTarget.toDOMWindow()->document();
    if (!image->cachedImage()->passesAccessControlCheck(document->securityOrigin()) && document->securityOrigin()->taintsCanvas(image->src())) {
        exceptionState.throwSecurityError("Cross-origin access to the source image is denied.");
        return ScriptPromise();
    }
    // FIXME: make ImageBitmap creation asynchronous crbug.com/258082
    return fulfillImageBitmap(scriptState, ImageBitmap::create(image, IntRect(sx, sy, sw, sh)));
}

void EventQueue::dispatchEvent(PassRefPtr<Event> event)
{
    EventTarget* eventTarget = event->target();
    if (eventTarget->toDOMWindow())
        eventTarget->toDOMWindow()->dispatchEvent(event, 0);
    else
        eventTarget->dispatchEvent(event);
}

void DOMWindowEventQueue::dispatchEvent(PassRefPtrWillBeRawPtr<Event> event)
{
    EventTarget* eventTarget = event->target();
    if (eventTarget->toDOMWindow())
        eventTarget->toDOMWindow()->dispatchEvent(event, nullptr);
    else
        eventTarget->dispatchEvent(event);
}

bool ScriptExecutionContext::dispatchErrorEvent(const String& errorMessage, int lineNumber, int columnNumber, const String& sourceURL, JSC::Exception* exception, CachedScript* cachedScript)
{
    EventTarget* target = errorEventTarget();
    if (!target)
        return false;

#if PLATFORM(IOS)
    if (target->toDOMWindow() && is<Document>(*this)) {
        Settings* settings = downcast<Document>(*this).settings();
        if (settings && !settings->shouldDispatchJavaScriptWindowOnErrorEvents())
            return false;
    }
#endif

    String message = errorMessage;
    int line = lineNumber;
    int column = columnNumber;
    String sourceName = sourceURL;
    Deprecated::ScriptValue error = exception && exception->value() ? Deprecated::ScriptValue(vm(), exception->value()) : Deprecated::ScriptValue();
    sanitizeScriptError(message, line, column, sourceName, error, cachedScript);

    ASSERT(!m_inDispatchErrorEvent);
    m_inDispatchErrorEvent = true;
    Ref<ErrorEvent> errorEvent = ErrorEvent::create(message, sourceName, line, column, error);
    target->dispatchEvent(errorEvent);
    m_inDispatchErrorEvent = false;
    return errorEvent->defaultPrevented();
}

void ScriptedAnimationController::dispatchEvents(const AtomicString& eventInterfaceFilter)
{
    WillBeHeapVector<RefPtrWillBeMember<Event> > events;
    if (eventInterfaceFilter.isEmpty()) {
        events.swap(m_eventQueue);
        m_perFrameEvents.clear();
    } else {
        WillBeHeapVector<RefPtrWillBeMember<Event> > remaining;
        for (auto& event : m_eventQueue) {
            if (event && event->interfaceName() == eventInterfaceFilter) {
                m_perFrameEvents.remove(eventTargetKey(event.get()));
                events.append(event.release());
            } else {
                remaining.append(event.release());
            }
        }
        remaining.swap(m_eventQueue);
    }


    for (size_t i = 0; i < events.size(); ++i) {
        EventTarget* eventTarget = events[i]->target();
        // FIXME: we should figure out how to make dispatchEvent properly virtual to avoid
        // special casting window.
        // FIXME: We should not fire events for nodes that are no longer in the tree.
        if (LocalDOMWindow* window = eventTarget->toDOMWindow())
            window->dispatchEvent(events[i], nullptr);
        else
            eventTarget->dispatchEvent(events[i]);

        InspectorInstrumentation::didRemoveEvent(eventTarget, events[i].get());
    }
}

bool ScriptExecutionContext::dispatchErrorEvent(const String& errorMessage, int lineNumber, int columnNumber, const String& sourceURL, CachedScript* cachedScript)
{
    EventTarget* target = errorEventTarget();
    if (!target)
        return false;

#if PLATFORM(IOS)
    if (target == target->toDOMWindow() && isDocument()) {
        Settings* settings = static_cast<Document*>(this)->settings();
        if (settings && !settings->shouldDispatchJavaScriptWindowOnErrorEvents())
            return false;
    }
#endif

    String message = errorMessage;
    int line = lineNumber;
    int column = columnNumber;
    String sourceName = sourceURL;
    sanitizeScriptError(message, line, column, sourceName, cachedScript);

    ASSERT(!m_inDispatchErrorEvent);
    m_inDispatchErrorEvent = true;
    RefPtr<ErrorEvent> errorEvent = ErrorEvent::create(message, sourceName, line, column);
    target->dispatchEvent(errorEvent);
    m_inDispatchErrorEvent = false;
    return errorEvent->defaultPrevented();
}

void ReplayController::willDispatchEvent(const Event& event, Frame* frame)
{
    EventTarget* target = event.target();
    if (!target && !frame)
        return;

    Document* document = frame ? frame->document() : nullptr;
    // Fetch the document from the event target, because the target could be detached.
    if (Node* node = target->toNode())
        document = node->inDocument() ? &node->document() : node->ownerDocument();
    else if (DOMWindow* window = target->toDOMWindow())
        document = window->document();

    ASSERT(document);
    InputCursor& cursor = document->inputCursor();

#if !LOG_DISABLED
    bool eventIsUnrelated = !cursor.isCapturing() && !cursor.isReplaying();
    logDispatchedDOMEvent(event, eventIsUnrelated);
#else
    UNUSED_PARAM(cursor);
#endif

#if ENABLE_AGGRESSIVE_DETERMINISM_CHECKS
    // To ensure deterministic JS execution, all DOM events must be dispatched deterministically.
    // If these assertions fail, then this DOM event is being dispatched by a nondeterministic EventLoop
    // cycle, and may cause program execution to diverge if any JS code runs because of the DOM event.
    if (cursor.isCapturing() || cursor.isReplaying())
        ASSERT(cursor.withinEventLoopInputExtent());
    else if (cursor.isReplaying())
        ASSERT(dispatcher().isDispatching());
#endif
}

void ScriptedAnimationController::dispatchEvents()
{
    Vector<RefPtr<Event> > events;
    events.swap(m_eventQueue);
    m_perFrameEvents.clear();

    for (size_t i = 0; i < events.size(); ++i) {
        EventTarget* eventTarget = events[i]->target();
        // FIXME: we should figure out how to make dispatchEvent properly virtual to avoid
        // special casting window.
        // FIXME: We should not fire events for nodes that are no longer in the tree.
        if (LocalDOMWindow* window = eventTarget->toDOMWindow())
            window->dispatchEvent(events[i], nullptr);
        else
            eventTarget->dispatchEvent(events[i]);
    }
}

ScriptPromise HTMLVideoElement::createImageBitmap(ScriptState* scriptState, EventTarget& eventTarget, int sx, int sy, int sw, int sh, const ImageBitmapOptions& options, ExceptionState& exceptionState)
{
    ASSERT(eventTarget.toDOMWindow());
    if (getNetworkState() == HTMLMediaElement::NETWORK_EMPTY) {
        exceptionState.throwDOMException(InvalidStateError, "The provided element has not retrieved data.");
        return ScriptPromise();
    }
    if (getReadyState() <= HTMLMediaElement::HAVE_METADATA) {
        exceptionState.throwDOMException(InvalidStateError, "The provided element's player has no current data.");
        return ScriptPromise();
    }
    if (!sw || !sh) {
        exceptionState.throwDOMException(IndexSizeError, String::format("The source %s provided is 0.", sw ? "height" : "width"));
        return ScriptPromise();
    }
    return ImageBitmapSource::fulfillImageBitmap(scriptState, ImageBitmap::create(this, IntRect(sx, sy, sw, sh), eventTarget.toDOMWindow()->document(), options));
}

static void logDispatchedDOMEvent(const Event& event, bool eventIsUnrelated)
{
    EventTarget* target = event.target();
    if (!target)
        return;

    // A DOM event is unrelated if it is being dispatched to a document that is neither capturing nor replaying.
    if (Node* node = target->toNode()) {
        LOG(WebReplay, "%-20s --->%s DOM event: type=%s, target=%u/node[%p] %s\n", "ReplayEvents",
            (eventIsUnrelated) ? "Unrelated" : "Dispatching",
            event.type().string().utf8().data(),
            frameIndexFromDocument((node->inDocument()) ? &node->document() : node->ownerDocument()),
            node,
            node->nodeName().utf8().data());
    } else if (DOMWindow* window = target->toDOMWindow()) {
        LOG(WebReplay, "%-20s --->%s DOM event: type=%s, target=%u/window[%p] %s\n", "ReplayEvents",
            (eventIsUnrelated) ? "Unrelated" : "Dispatching",
            event.type().string().utf8().data(),
            frameIndexFromDocument(window->document()),
            window,
            window->location()->href().utf8().data());
    }
}