1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ 2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */ 3 /* This Source Code Form is subject to the terms of the Mozilla Public 4 * License, v. 2.0. If a copy of the MPL was not distributed with this 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ 6 7 /** 8 * A common base class for representing WebIDL callback function types in C++. 9 * 10 * This class implements common functionality like lifetime 11 * management, initialization with the callable, and setup of the call 12 * environment. Subclasses corresponding to particular callback 13 * function types should provide a Call() method that actually does 14 * the call. 15 */ 16 17 #ifndef mozilla_dom_CallbackFunction_h 18 #define mozilla_dom_CallbackFunction_h 19 20 #include "mozilla/dom/CallbackObject.h" 21 22 namespace mozilla { 23 namespace dom { 24 25 class CallbackFunction : public CallbackObject { 26 public: 27 // See CallbackObject for an explanation of the arguments. CallbackFunction(JSContext * aCx,JS::Handle<JSObject * > aCallable,nsIGlobalObject * aIncumbentGlobal)28 explicit CallbackFunction(JSContext* aCx, JS::Handle<JSObject*> aCallable, 29 nsIGlobalObject* aIncumbentGlobal) 30 : CallbackObject(aCx, aCallable, aIncumbentGlobal) {} 31 32 // See CallbackObject for an explanation of the arguments. CallbackFunction(JS::Handle<JSObject * > aCallable,JS::Handle<JSObject * > aAsyncStack,nsIGlobalObject * aIncumbentGlobal)33 explicit CallbackFunction(JS::Handle<JSObject*> aCallable, 34 JS::Handle<JSObject*> aAsyncStack, 35 nsIGlobalObject* aIncumbentGlobal) 36 : CallbackObject(aCallable, aAsyncStack, aIncumbentGlobal) {} 37 CallableOrNull()38 JS::Handle<JSObject*> CallableOrNull() const { return CallbackOrNull(); } 39 CallablePreserveColor()40 JS::Handle<JSObject*> CallablePreserveColor() const { 41 return CallbackPreserveColor(); 42 } 43 HasGrayCallable()44 bool HasGrayCallable() const { 45 // Play it safe in case this gets called after unlink. 46 return mCallback && JS::ObjectIsMarkedGray(mCallback); 47 } 48 49 protected: CallbackFunction(CallbackFunction * aCallbackFunction)50 explicit CallbackFunction(CallbackFunction* aCallbackFunction) 51 : CallbackObject(aCallbackFunction) {} 52 53 // See CallbackObject for an explanation of the arguments. CallbackFunction(JS::Handle<JSObject * > aCallable,const FastCallbackConstructor &)54 CallbackFunction(JS::Handle<JSObject*> aCallable, 55 const FastCallbackConstructor&) 56 : CallbackObject(aCallable, FastCallbackConstructor()) {} 57 }; 58 59 } // namespace dom 60 } // namespace mozilla 61 62 #endif // mozilla_dom_CallbackFunction_h 63