/* vim: se cin sw=2 ts=2 et : */ /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ #ifndef __mozilla_widget_GfxInfoCollector_h__ #define __mozilla_widget_GfxInfoCollector_h__ #include "mozilla/Attributes.h" #include "nsStringFwd.h" #include "js/RootingAPI.h" namespace mozilla { namespace widget { /* this is handy wrapper around JSAPI to make it more pleasant to use. * We collect the JSAPI errors and so that callers don't need to */ class MOZ_STACK_CLASS InfoObject { friend class GfxInfoBase; public: void DefineProperty(const char *name, int value); void DefineProperty(const char *name, nsAString &value); void DefineProperty(const char *name, const char *value); private: // We need to ensure that this object lives on the stack so that GC sees it properly explicit InfoObject(JSContext *aCx); InfoObject(InfoObject&); JSContext *mCx; JS::Rooted<JSObject*> mObj; bool mOk; }; /* Here's an example usage: class Foo { Foo::Foo() : mInfoCollector(this, &Foo::GetAweseomeness) {} void GetAwesomeness(InfoObject &obj) { obj.DefineProperty("awesome", mAwesome); } int mAwesome; GfxInfoCollector<Foo> mInfoCollector; } This will define a property on the object returned from calling getInfo() on a GfxInfo object. e.g. gfxInfo = Cc["@mozilla.org/gfx/info;1"].getService(Ci.nsIGfxInfo); info = gfxInfo.getInfo(); if (info.awesome) alert(info.awesome); */ class GfxInfoCollectorBase { public: GfxInfoCollectorBase(); virtual void GetInfo(InfoObject &obj) = 0; virtual ~GfxInfoCollectorBase(); }; template<class T> class GfxInfoCollector : public GfxInfoCollectorBase { public: GfxInfoCollector(T* aPointer, void (T::*aFunc)(InfoObject &obj)) : mPointer(aPointer), mFunc(aFunc) { } virtual void GetInfo(InfoObject &obj) override { (mPointer->*mFunc)(obj); } protected: T* mPointer; void (T::*mFunc)(InfoObject &obj); }; } // namespace widget } // namespace mozilla #endif