gecko-dev/layout/build/nsLayoutFactory.cpp

262 lines
7.0 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#include "nscore.h"
#include "nslayout.h"
#include "nsIFactory.h"
#include "nsISupports.h"
#include "nsLayoutCID.h"
#include "nsIDocument.h"
#include "nsIHTMLContent.h"
#include "nsHTMLAtoms.h"
#include "nsHTMLParts.h"
#include "nsIDOMHTMLImageElement.h"
#include "nsDOMCID.h"
#include "nsIDOMNativeObjectRegistry.h"
#include "nsIServiceManager.h"
static NS_DEFINE_IID(kCHTMLDocumentCID, NS_HTMLDOCUMENT_CID);
static NS_DEFINE_IID(kCImageDocumentCID, NS_IMAGEDOCUMENT_CID);
static NS_DEFINE_IID(kCHTMLImageElementFactoryCID, NS_HTMLIMAGEELEMENTFACTORY_CID);
static NS_DEFINE_IID(kIDOMHTMLImageElementFactoryIID, NS_IDOMHTMLIMAGEELEMENTFACTORY_IID);
static NS_DEFINE_IID(kIDOMHTMLImageElementIID, NS_IDOMHTMLIMAGEELEMENT_IID);
class HTMLImageElementFactory : public nsIDOMHTMLImageElementFactory {
public:
HTMLImageElementFactory();
~HTMLImageElementFactory();
NS_DECL_ISUPPORTS
NS_IMETHOD CreateInstance(nsIDOMHTMLImageElement **aReturn);
};
HTMLImageElementFactory::HTMLImageElementFactory()
{
NS_INIT_REFCNT();
}
HTMLImageElementFactory::~HTMLImageElementFactory()
{
}
NS_IMPL_ISUPPORTS(HTMLImageElementFactory, kIDOMHTMLImageElementFactoryIID);
NS_IMETHODIMP
HTMLImageElementFactory::CreateInstance(nsIDOMHTMLImageElement **aReturn)
{
nsIHTMLContent *content;
nsresult rv = NS_NewHTMLImageElement(&content, nsHTMLAtoms::img);
if (NS_OK != rv) {
return rv;
}
rv = content->QueryInterface(kIDOMHTMLImageElementIID, (void **)aReturn);
NS_RELEASE(content);
return rv;
}
////////////////////////////////////////////////////////////
//
////////////////////////////////////////////////////////////
static NS_DEFINE_IID(kDOMNativeObjectRegistryCID, NS_DOM_NATIVE_OBJECT_REGISTRY_CID);
static NS_DEFINE_IID(kIDOMNativeObjectRegistryIID, NS_IDOM_NATIVE_OBJECT_REGISTRY_IID);
static NS_DEFINE_IID(kISupportsIID, NS_ISUPPORTS_IID);
static NS_DEFINE_IID(kIFactoryIID, NS_IFACTORY_IID);
class nsLayoutFactory : public nsIFactory
{
public:
// nsISupports methods
NS_IMETHOD QueryInterface(const nsIID &aIID,
void **aResult);
NS_IMETHOD_(nsrefcnt) AddRef(void);
NS_IMETHOD_(nsrefcnt) Release(void);
// nsIFactory methods
NS_IMETHOD CreateInstance(nsISupports *aOuter,
const nsIID &aIID,
void **aResult);
NS_IMETHOD LockFactory(PRBool aLock);
nsLayoutFactory(const nsCID &aClass);
protected:
virtual ~nsLayoutFactory();
private:
nsrefcnt mRefCnt;
nsCID mClassID;
};
nsLayoutFactory::nsLayoutFactory(const nsCID &aClass)
{
mRefCnt = 0;
mClassID = aClass;
}
nsLayoutFactory::~nsLayoutFactory()
{
NS_ASSERTION(mRefCnt == 0, "non-zero refcnt at destruction");
}
nsresult nsLayoutFactory::QueryInterface(const nsIID &aIID,
void **aResult)
{
if (aResult == NULL) {
return NS_ERROR_NULL_POINTER;
}
// Always NULL result, in case of failure
*aResult = NULL;
if (aIID.Equals(kISupportsIID)) {
*aResult = (void *)(nsISupports*)this;
} else if (aIID.Equals(kIFactoryIID)) {
*aResult = (void *)(nsIFactory*)this;
}
if (*aResult == NULL) {
return NS_NOINTERFACE;
}
AddRef(); // Increase reference count for caller
return NS_OK;
}
nsrefcnt nsLayoutFactory::AddRef()
{
return ++mRefCnt;
}
nsrefcnt nsLayoutFactory::Release()
{
if (--mRefCnt == 0) {
delete this;
return 0; // Don't access mRefCnt after deleting!
}
return mRefCnt;
}
nsresult nsLayoutFactory::CreateInstance(nsISupports *aOuter,
const nsIID &aIID,
void **aResult)
{
nsresult res;
PRBool refCounted = PR_TRUE;
if (aResult == NULL) {
return NS_ERROR_NULL_POINTER;
}
*aResult = NULL;
nsISupports *inst = nsnull;
// XXX ClassID check happens here
if (mClassID.Equals(kCHTMLDocumentCID)) {
res = NS_NewHTMLDocument((nsIDocument **)&inst);
if (res != NS_OK) {
return res;
}
refCounted = PR_TRUE;
}
if (mClassID.Equals(kCImageDocumentCID)) {
res = NS_NewImageDocument((nsIDocument **)&inst);
if (res != NS_OK) {
return res;
}
refCounted = PR_TRUE;
}
if (mClassID.Equals(kCHTMLImageElementFactoryCID)) {
inst = new HTMLImageElementFactory();
refCounted = PR_FALSE;
}
if (inst == NULL) {
return NS_ERROR_OUT_OF_MEMORY;
}
res = inst->QueryInterface(aIID, aResult);
if (refCounted) {
NS_RELEASE(inst);
}
else if (res != NS_OK) {
// We didn't get the right interface, so clean up
delete inst;
}
return res;
}
nsresult nsLayoutFactory::LockFactory(PRBool aLock)
{
// Not implemented in simplest case.
return NS_OK;
}
class NativeObjectRegistryManager {
public:
static nsIDOMNativeObjectRegistry *gRegistry;
NativeObjectRegistryManager() {};
~NativeObjectRegistryManager() {
if (gRegistry) {
nsServiceManager::ReleaseService(kDOMNativeObjectRegistryCID,
gRegistry);
gRegistry = nsnull;
}
}
};
nsIDOMNativeObjectRegistry *NativeObjectRegistryManager::gRegistry = nsnull;
static NativeObjectRegistryManager gManager;
// return the proper factory to the caller
#ifdef XP_MAC
extern "C" NS_LAYOUT nsresult NSGetFactory_LAYOUT_DLL(const nsCID &aClass, nsIFactory **aFactory)
#else
extern "C" NS_LAYOUT nsresult NSGetFactory(const nsCID &aClass, nsIFactory **aFactory)
#endif
{
if (nsnull == NativeObjectRegistryManager::gRegistry) {
nsresult result = nsServiceManager::GetService(kDOMNativeObjectRegistryCID,
kIDOMNativeObjectRegistryIID,
(nsISupports **)&NativeObjectRegistryManager::gRegistry);
if (NS_OK == result) {
NativeObjectRegistryManager::gRegistry->RegisterFactory("HTMLImageElement", kCHTMLImageElementFactoryCID);
}
}
if (nsnull == aFactory) {
return NS_ERROR_NULL_POINTER;
}
*aFactory = new nsLayoutFactory(aClass);
if (nsnull == aFactory) {
return NS_ERROR_OUT_OF_MEMORY;
}
return (*aFactory)->QueryInterface(kIFactoryIID, (void**)aFactory);
}