338 lines
9.4 KiB
C++
338 lines
9.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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* Pierre Phaneuf <pp@ludusdesign.com>
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*/
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#include "nscore.h"
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#include "nsIGenericFactory.h"
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#include "nsISupports.h"
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#include "nsCOMPtr.h"
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#include "nsIServiceManager.h"
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#include "nsViewsCID.h"
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#include "nsView.h"
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#include "nsScrollingView.h"
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#include "nsScrollPortView.h"
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#include "nsIModule.h"
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#include "nsIPref.h"
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static NS_DEFINE_CID(kCViewManager, NS_VIEW_MANAGER_CID);
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static NS_DEFINE_CID(kCView, NS_VIEW_CID);
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static NS_DEFINE_CID(kCScrollingView, NS_SCROLLING_VIEW_CID);
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static NS_DEFINE_IID(kCScrollPortView, NS_SCROLL_PORT_VIEW_CID);
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static NS_DEFINE_CID(kCComponentManager, NS_COMPONENTMANAGER_CID);
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static NS_DEFINE_IID(kISupportsIID, NS_ISUPPORTS_IID);
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static NS_DEFINE_IID(kIFactoryIID, NS_IFACTORY_IID);
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static const char kUseNewViewManagerPref[] = "nglayout.debug.enable_scary_view_manager";
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class nsViewFactory : public nsIFactory
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{
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public:
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nsViewFactory(const nsCID &aClass);
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virtual ~nsViewFactory();
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NS_DECL_ISUPPORTS
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NS_DECL_NSIFACTORY
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private:
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nsCID mClassID;
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};
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nsViewFactory::nsViewFactory(const nsCID &aClass)
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{
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NS_INIT_ISUPPORTS();
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mClassID = aClass;
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}
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nsViewFactory::~nsViewFactory()
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{
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}
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NS_IMPL_ISUPPORTS1(nsViewFactory, nsIFactory)
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nsresult nsViewFactory::CreateInstance(nsISupports *aOuter,
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const nsIID &aIID,
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void **aResult)
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{
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nsresult rv = NS_OK;
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if (aResult == NULL) {
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return NS_ERROR_NULL_POINTER;
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}
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*aResult = NULL;
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// views aren't reference counted, so have to be treated specially.
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// their lifetimes are managed by the view manager they are associated with.
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nsIView* view = nsnull;
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if (mClassID.Equals(kCView)) {
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view = new nsView();
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} else if (mClassID.Equals(kCScrollingView)) {
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view = new nsScrollingView();
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} else if (mClassID.Equals(kCScrollPortView)) {
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view = new nsScrollPortView();
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}
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if (nsnull == view)
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return NS_ERROR_OUT_OF_MEMORY;
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rv = view->QueryInterface(aIID, aResult);
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if (NS_FAILED(rv))
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view->Destroy();
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return rv;
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}
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nsresult nsViewFactory::LockFactory(PRBool aLock)
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{
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// Not implemented in simplest case.
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return NS_OK;
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}
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#include "nsViewManager.h"
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#include "nsViewManager2.h"
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NS_GENERIC_FACTORY_CONSTRUCTOR(nsViewManager)
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NS_GENERIC_FACTORY_CONSTRUCTOR(nsViewManager2)
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static NS_IMETHODIMP ViewManagerConstructor(nsISupports *aOuter, REFNSIID aIID, void **aResult)
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{
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PRBool useNewViewManager = PR_FALSE;
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nsCOMPtr<nsIPref> prefs( do_GetService(NS_PREF_CONTRACTID) );
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if (prefs)
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prefs->GetBoolPref(kUseNewViewManagerPref, &useNewViewManager);
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return useNewViewManager ? nsViewManagerConstructor(aOuter, aIID, aResult)
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: nsViewManager2Constructor(aOuter, aIID, aResult);
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}
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#define nsViewManagerConstructor ViewManagerConstructor
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//////////////////////////////////////////////////////////////////////
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// Module object definition
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class nsViewModule : public nsIModule
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{
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public:
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NS_DECL_ISUPPORTS
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// Construction, Init and destruction
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nsViewModule();
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virtual ~nsViewModule();
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// nsIModule Interfaces
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NS_DECL_NSIMODULE
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// Facility for counting object instances
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int IncrementObjCount() { if (mObjCount < 0) mObjCount = 0; return ++mObjCount; }
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int DecrementObjCount()
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{
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NS_ASSERTION(mObjCount <= -1, "Object count negative.");
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return --mObjCount;
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}
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int GetObjCount() { return mObjCount; }
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private:
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int mObjCount;
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};
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//////////////////////////////////////////////////////////////////////
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// Module Global
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//
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// This is used by the module to count object. Constructors and
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// destructors of objects created by this module need to
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// inc/dec the object count for the module. Unload decision will
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// be taken based on this.
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//
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// Constructor:
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// gModule->IncrementObjCount();
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//
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// Descructor:
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// gModule->DecrementObjCount();
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//
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// WARNING: This is weak reference. XPCOM guarantees that this module
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// object will be deleted just before the dll is unloaded. Hence,
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// holding a weak reference is ok.
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static nsViewModule *gModule = NULL;
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//////////////////////////////////////////////////////////////////////
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// Module entry point
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extern "C" NS_EXPORT nsresult NSGetModule(nsIComponentManager *servMgr,
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nsIFile* aPath,
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nsIModule** return_cobj)
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{
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nsViewModule *viewModule;
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nsresult rv = NS_OK;
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NS_ASSERTION(return_cobj, "Null argument");
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NS_ASSERTION(gModule == NULL, "nsViewModule: Module already created.");
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viewModule = new nsViewModule;
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if (viewModule == NULL) return NS_ERROR_OUT_OF_MEMORY;
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rv = viewModule->QueryInterface(NS_GET_IID(nsIModule), (void **)return_cobj);
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if (NS_FAILED(rv))
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{
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delete viewModule;
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viewModule = NULL;
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}
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// WARNING: Weak Reference
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gModule = viewModule;
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return rv;
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}
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//////////////////////////////////////////////////////////////////////
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// VIEW Decoder Module Implementation
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NS_IMPL_ISUPPORTS(nsViewModule, NS_GET_IID(nsIModule))
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nsViewModule::nsViewModule(void)
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: mObjCount(-1)
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{
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NS_INIT_ISUPPORTS();
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}
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nsViewModule::~nsViewModule(void)
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{
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NS_ASSERTION(mObjCount <= 0, "Module released while having outstanding objects.");
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}
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//
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// The class object for us is just the factory and nothing more.
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//
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NS_IMETHODIMP
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nsViewModule::GetClassObject(nsIComponentManager *aCompMgr, const nsCID & aClass,
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const nsIID &aIID, void **aFactory)
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{
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nsresult rv = NS_OK;
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if (nsnull == aFactory)
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return NS_ERROR_NULL_POINTER;
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// XXX should we do this ?
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*aFactory = nsnull;
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if (aClass.Equals(kCViewManager))
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{
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nsCOMPtr<nsIGenericFactory> factory;
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rv = NS_NewGenericFactory(getter_AddRefs(factory), &nsViewManagerConstructor);
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if (NS_SUCCEEDED(rv))
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{
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rv = factory->QueryInterface(aIID, aFactory);
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}
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}
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else if (aClass.Equals(kCView) || aClass.Equals(kCScrollingView) || aClass.Equals(kCScrollPortView))
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{
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rv = NS_ERROR_OUT_OF_MEMORY;
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nsViewFactory* factory = new nsViewFactory(aClass);
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if (factory)
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{
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NS_ADDREF(factory);
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rv = factory->QueryInterface(aIID, aFactory);
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NS_RELEASE(factory);
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}
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}
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return rv;
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}
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NS_IMETHODIMP
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nsViewModule::RegisterSelf(nsIComponentManager *aCompMgr,
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nsIFile* aPath,
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const char *registryLocation,
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const char *componentType)
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{
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nsresult rv;
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#ifdef DEBUG_dp
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printf("***Registering view library...");
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#endif
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rv = aCompMgr->RegisterComponentSpec(kCViewManager, "View Manager",
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"@mozilla.org/view-manager;1",
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aPath, PR_TRUE, PR_TRUE);
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if (NS_FAILED(rv)) return rv;
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rv = aCompMgr->RegisterComponentSpec(kCView, "View",
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"@mozilla.org/view;1",
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aPath, PR_TRUE, PR_TRUE);
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if (NS_FAILED(rv)) return rv;
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rv = aCompMgr->RegisterComponentSpec(kCScrollingView, "Scrolling View",
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"@mozilla.org/scrolling-view;1",
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aPath, PR_TRUE, PR_TRUE);
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if (NS_FAILED(rv)) return rv;
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rv = aCompMgr->RegisterComponentSpec(kCScrollPortView, "Scroll Port View",
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"@mozilla.org/scroll-port-view;1",
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aPath, PR_TRUE, PR_TRUE);
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#ifdef DEBUG_dp
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printf("done.\n");
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#endif
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return rv;
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}
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NS_IMETHODIMP
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nsViewModule::UnregisterSelf(nsIComponentManager *aCompMgr,
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nsIFile* aPath,
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const char *registryLocation)
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{
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nsresult rv;
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rv = aCompMgr->UnregisterComponentSpec(kCViewManager, aPath);
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if (NS_FAILED(rv)) return rv;
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rv = aCompMgr->UnregisterComponentSpec(kCView, aPath);
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if (NS_FAILED(rv)) return rv;
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rv = aCompMgr->UnregisterComponentSpec(kCScrollingView, aPath);
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if (NS_FAILED(rv)) return rv;
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rv = aCompMgr->UnregisterComponentSpec(kCScrollPortView, aPath);
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return rv;
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}
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NS_IMETHODIMP
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nsViewModule::CanUnload(nsIComponentManager *aCompMgr, PRBool *okToUnload)
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{
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if (mObjCount < 0)
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{
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// Dll doesn't count objects.
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return NS_ERROR_FAILURE;
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}
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PRBool unloadable = PR_FALSE;
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if (mObjCount == 0)
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{
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// This dll can be unloaded now
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unloadable = PR_TRUE;
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}
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if (okToUnload) *okToUnload = unloadable;
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return NS_OK;
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}
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//////////////////////////////////////////////////////////////////////
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