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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// Base classes to unclutter the writing of NPAPI objects.
#ifndef CEEE_COMMON_NPOBJECT_IMPL_H_
#define CEEE_COMMON_NPOBJECT_IMPL_H_
#include "base/basictypes.h"
#include "third_party/npapi/bindings/nphostapi.h"
// Base class for NPAPI objects.
class NpObjectBase: public NPObject {
public:
explicit NpObjectBase(NPP npp) : npp_(npp) {
}
virtual ~NpObjectBase() {
}
protected:
// @name NP Object interface.
// Override these to implement your object's functionality.
// For documentation on these methods, see the corresponding callback
// function description in http://developer.mozilla.org/en/NPObject
// @{
virtual void Invalidate();
virtual bool HasMethod(NPIdentifier name);
virtual bool Invoke(NPIdentifier name,
const NPVariant* args,
uint32_t argCount,
NPVariant* result);
virtual bool InvokeDefault(const NPVariant* args,
uint32_t argCount,
NPVariant* result);
virtual bool HasProperty(NPIdentifier name);
virtual bool GetProperty(NPIdentifier name, NPVariant* result);
virtual bool SetProperty(NPIdentifier name, const NPVariant* value);
virtual bool RemoveProperty(NPIdentifier name);
virtual bool Enumeration(NPIdentifier** value, uint32_t* count);
virtual bool Construct(const NPVariant* args, uint32_t argCount,
NPVariant* result);
// @}
// @name NP callback functions.
// @{
static void NPDeallocate(NPObject* obj);
static void NPInvalidate(NPObject* obj);
static bool NPHasMethod(NPObject* obj, NPIdentifier name);
static bool NPInvoke(NPObject* npobj,
NPIdentifier name,
const NPVariant* args,
uint32_t argCount,
NPVariant* result);
static bool NPInvokeDefault(NPObject* npobj,
const NPVariant* args,
uint32_t argCount,
NPVariant* result);
static bool NPHasProperty(NPObject* npobj, NPIdentifier name);
static bool NPGetProperty(NPObject* npobj,
NPIdentifier name,
NPVariant* result);
static bool NPSetProperty(NPObject* npobj,
NPIdentifier name,
const NPVariant* value);
static bool NPRemoveProperty(NPObject* npobj,
NPIdentifier name);
static bool NPEnumeration(NPObject* npobj, NPIdentifier** value,
uint32_t* count);
static bool NPConstruct(NPObject* npobj, const NPVariant* args,
uint32_t arg_count, NPVariant* result);
// @}
NPP npp() const { return npp_; }
private:
// The NPP instance we belong to.
NPP npp_;
DISALLOW_COPY_AND_ASSIGN(NpObjectBase);
};
// Derive your NPAPI object class from NpObjectImpl<MyClass>.
template <class ImplClass> class NpObjectImpl: public NpObjectBase {
public:
explicit NpObjectImpl(NPP npp) : NpObjectBase(npp) {
}
static NPObject* NPAllocate(NPP npp, NPClass* np_class) {
NPObject* object = new ImplClass(npp);
object->_class = np_class;
object->referenceCount = 1;
return object;
}
static NPClass* object_class() { return &object_class_; }
private:
static NPClass object_class_;
DISALLOW_COPY_AND_ASSIGN(NpObjectImpl);
};
template <class ImplClass> NPClass NpObjectImpl<ImplClass>::object_class_ = {
NP_CLASS_STRUCT_VERSION,
ImplClass::NPAllocate, // allocate;
ImplClass::NPDeallocate, // deallocate;
ImplClass::NPInvalidate, // invalidate;
ImplClass::NPHasMethod, // hasMethod;
ImplClass::NPInvoke, // invoke;
ImplClass::NPInvokeDefault, // invokeDefault;
ImplClass::NPHasProperty, // hasProperty;
ImplClass::NPGetProperty, // getProperty;
ImplClass::NPSetProperty, // setProperty;
ImplClass::NPRemoveProperty, // removeProperty;
ImplClass::NPEnumeration, // enumerate
ImplClass::NPConstruct, // construct
};
#endif // CEEE_COMMON_NPOBJECT_IMPL_H_
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