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 #ifndef mozilla_widget_WindowEvent_h 8 #define mozilla_widget_WindowEvent_h 9 10 #include "nsThreadUtils.h" 11 #include "mozilla/jni/Natives.h" 12 13 namespace mozilla { 14 namespace widget { 15 16 // An Event subclass that guards against stale events. 17 // (See the implmentation of mozilla::jni::detail::ProxyNativeCall for info 18 // about the default template parameters for this class) 19 template <typename Lambda, bool IsStatic = Lambda::isStatic, 20 typename InstanceType = typename Lambda::ThisArgType, 21 class Impl = typename Lambda::TargetClass> 22 class WindowEvent : public Runnable { IsStaleCall()23 bool IsStaleCall() { 24 if (IsStatic) { 25 // Static calls are never stale. 26 return false; 27 } 28 29 return jni::NativePtrTraits<Impl>::IsStale(mInstance); 30 } 31 32 Lambda mLambda; 33 const InstanceType mInstance; 34 35 public: WindowEvent(Lambda && aLambda,InstanceType && aInstance)36 WindowEvent(Lambda&& aLambda, InstanceType&& aInstance) 37 : Runnable("mozilla::widget::WindowEvent"), 38 mLambda(std::move(aLambda)), 39 mInstance(std::forward<InstanceType>(aInstance)) {} 40 WindowEvent(Lambda && aLambda)41 explicit WindowEvent(Lambda&& aLambda) 42 : Runnable("mozilla::widget::WindowEvent"), 43 mLambda(std::move(aLambda)), 44 mInstance(mLambda.GetThisArg()) {} 45 Run()46 NS_IMETHOD Run() override { 47 if (!IsStaleCall()) { 48 mLambda(); 49 } 50 return NS_OK; 51 } 52 }; 53 54 } // namespace widget 55 } // namespace mozilla 56 57 #endif // mozilla_widget_WindowEvent_h 58