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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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_WindowEvent_h
#define mozilla_widget_WindowEvent_h
#include "nsThreadUtils.h"
#include "mozilla/jni/Natives.h"
namespace mozilla {
namespace widget {
// An Event subclass that guards against stale events.
// (See the implmentation of mozilla::jni::detail::ProxyNativeCall for info
// about the default template parameters for this class)
template <typename Lambda, bool IsStatic = Lambda::isStatic,
typename InstanceType = typename Lambda::ThisArgType,
class Impl = typename Lambda::TargetClass>
class WindowEvent : public Runnable {
bool IsStaleCall() {
if (IsStatic) {
// Static calls are never stale.
return false;
}
return jni::NativePtrTraits<Impl>::IsStale(mInstance);
}
Lambda mLambda;
const InstanceType mInstance;
public:
WindowEvent(Lambda&& aLambda, InstanceType&& aInstance)
: Runnable("mozilla::widget::WindowEvent"),
mLambda(std::move(aLambda)),
mInstance(std::forward<InstanceType>(aInstance)) {}
explicit WindowEvent(Lambda&& aLambda)
: Runnable("mozilla::widget::WindowEvent"),
mLambda(std::move(aLambda)),
mInstance(mLambda.GetThisArg()) {}
NS_IMETHOD Run() override {
if (!IsStaleCall()) {
mLambda();
}
return NS_OK;
}
};
} // namespace widget
} // namespace mozilla
#endif // mozilla_widget_WindowEvent_h
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