Source/bindings/v8/custom/V8HTMLImageElementConstructor.cpp

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#include "config.h"
#include "bindings/v8/custom/V8HTMLImageElementConstructor.h"

#include "HTMLNames.h"
#include "V8Document.h"
#include "V8HTMLImageElement.h"
#include "bindings/v8/BindingSecurity.h"
#include "bindings/v8/V8Binding.h"
#include "bindings/v8/V8ObjectConstructor.h"
#include "core/dom/Document.h"
#include "core/html/HTMLImageElement.h"
#include "core/page/Frame.h"
#include "wtf/RefPtr.h"

namespace WebCore {

WrapperTypeInfo V8HTMLImageElementConstructor::info = { V8HTMLImageElementConstructor::GetTemplate, V8HTMLImageElement::derefObject, 0, V8HTMLImageElement::toEventTarget, 0, V8HTMLImageElement::installPerContextPrototypeProperties, 0, WrapperTypeObjectPrototype };

static void v8HTMLImageElementConstructorMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& args)
{
    if (!args.IsConstructCall()) {
        throwTypeError("DOM object constructor cannot be called as a function.", args.GetIsolate());
        return;
    }

    if (ConstructorMode::current() == ConstructorMode::WrapExistingObject) {
        v8SetReturnValue(args, args.Holder());
        return;
    }

    Document* document = currentDocument();

    // Make sure the document is added to the DOM Node map. Otherwise, the HTMLImageElement instance
    // may end up being the only node in the map and get garbage-collected prematurely.
    // FIXME: The correct way to do this would be to make HTMLImageElement derive from
    // ActiveDOMObject and use its interface to keep its wrapper alive. Then we would
    // remove this code and the special case in isObservableThroughDOM.
    toV8(document, args.Holder(), args.GetIsolate());

    int width;
    int height;
    int* optionalWidth = 0;
    int* optionalHeight = 0;
    if (args.Length() > 0) {
        width = toInt32(args[0]);
        optionalWidth = &width;
    }
    if (args.Length() > 1) {
        height = toInt32(args[1]);
        optionalHeight = &height;
    }

    RefPtr<HTMLImageElement> image = HTMLImageElement::createForJSConstructor(document, optionalWidth, optionalHeight);
    v8::Handle<v8::Object> wrapper = args.Holder();
    V8DOMWrapper::associateObjectWithWrapper<V8HTMLImageElement>(image.release(), &V8HTMLImageElementConstructor::info, wrapper, args.GetIsolate(), WrapperConfiguration::Dependent);
    v8SetReturnValue(args, wrapper);
}

v8::Handle<v8::FunctionTemplate> V8HTMLImageElementConstructor::GetTemplate(v8::Isolate* isolate, WrapperWorldType worldType)
{
    static v8::Persistent<v8::FunctionTemplate> cachedTemplate;
    if (!cachedTemplate.IsEmpty())
        return v8::Local<v8::FunctionTemplate>::New(isolate, cachedTemplate);

    v8::HandleScope scope(isolate);
    v8::Local<v8::FunctionTemplate> result = v8::FunctionTemplate::New(v8HTMLImageElementConstructorMethodCustom);

    v8::Local<v8::ObjectTemplate> instance = result->InstanceTemplate();
    instance->SetInternalFieldCount(V8HTMLImageElement::internalFieldCount);
    result->SetClassName(v8::String::NewSymbol("HTMLImageElement"));
    result->Inherit(V8HTMLImageElement::GetTemplate(isolate, worldType));

    cachedTemplate.Reset(isolate, result);
    return scope.Close(v8::Local<v8::FunctionTemplate>::New(isolate, cachedTemplate));
}

} // namespace WebCore