445 lines
14 KiB
C++
445 lines
14 KiB
C++
// Copyright (c) 2014 Marshall A. Greenblatt. Portions copyright (c) 2013
|
|
// Google Inc. All rights reserved.
|
|
//
|
|
// Redistribution and use in source and binary forms, with or without
|
|
// modification, are permitted provided that the following conditions are
|
|
// met:
|
|
//
|
|
// * Redistributions of source code must retain the above copyright
|
|
// notice, this list of conditions and the following disclaimer.
|
|
// * Redistributions in binary form must reproduce the above
|
|
// copyright notice, this list of conditions and the following disclaimer
|
|
// in the documentation and/or other materials provided with the
|
|
// distribution.
|
|
// * Neither the name of Google Inc. nor the name Chromium Embedded
|
|
// Framework nor the names of its contributors may be used to endorse
|
|
// or promote products derived from this software without specific prior
|
|
// written permission.
|
|
//
|
|
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
#ifndef CEF_INCLUDE_BASE_CEF_CALLBACK_LIST_H_
|
|
#define CEF_INCLUDE_BASE_CEF_CALLBACK_LIST_H_
|
|
#pragma once
|
|
|
|
#if defined(BASE_CALLBACK_LIST_H_)
|
|
// Do nothing if the Chromium header has already been included.
|
|
// This can happen in cases where Chromium code is used directly by the
|
|
// client application. When using Chromium code directly always include
|
|
// the Chromium header first to avoid type conflicts.
|
|
#elif defined(BUILDING_CEF_SHARED)
|
|
// When building CEF include the Chromium header directly.
|
|
#include "base/callback_list.h"
|
|
#else // !BUILDING_CEF_SHARED
|
|
// The following is substantially similar to the Chromium implementation.
|
|
// If the Chromium implementation diverges the below implementation should be
|
|
// updated to match.
|
|
|
|
#include <list>
|
|
|
|
#include "include/base/cef_basictypes.h"
|
|
#include "include/base/cef_callback.h"
|
|
#include "include/base/internal/cef_callback_internal.h"
|
|
#include "include/base/cef_build.h"
|
|
#include "include/base/cef_logging.h"
|
|
#include "include/base/cef_macros.h"
|
|
#include "include/base/cef_scoped_ptr.h"
|
|
|
|
// OVERVIEW:
|
|
//
|
|
// A container for a list of callbacks. Unlike a normal STL vector or list,
|
|
// this container can be modified during iteration without invalidating the
|
|
// iterator. It safely handles the case of a callback removing itself
|
|
// or another callback from the list while callbacks are being run.
|
|
//
|
|
// TYPICAL USAGE:
|
|
//
|
|
// class MyWidget {
|
|
// public:
|
|
// ...
|
|
//
|
|
// typedef base::Callback<void(const Foo&)> OnFooCallback;
|
|
//
|
|
// scoped_ptr<base::CallbackList<void(const Foo&)>::Subscription>
|
|
// RegisterCallback(const OnFooCallback& cb) {
|
|
// return callback_list_.Add(cb);
|
|
// }
|
|
//
|
|
// private:
|
|
// void NotifyFoo(const Foo& foo) {
|
|
// callback_list_.Notify(foo);
|
|
// }
|
|
//
|
|
// base::CallbackList<void(const Foo&)> callback_list_;
|
|
//
|
|
// DISALLOW_COPY_AND_ASSIGN(MyWidget);
|
|
// };
|
|
//
|
|
//
|
|
// class MyWidgetListener {
|
|
// public:
|
|
// MyWidgetListener::MyWidgetListener() {
|
|
// foo_subscription_ = MyWidget::GetCurrent()->RegisterCallback(
|
|
// base::Bind(&MyWidgetListener::OnFoo, this)));
|
|
// }
|
|
//
|
|
// MyWidgetListener::~MyWidgetListener() {
|
|
// // Subscription gets deleted automatically and will deregister
|
|
// // the callback in the process.
|
|
// }
|
|
//
|
|
// private:
|
|
// void OnFoo(const Foo& foo) {
|
|
// // Do something.
|
|
// }
|
|
//
|
|
// scoped_ptr<base::CallbackList<void(const Foo&)>::Subscription>
|
|
// foo_subscription_;
|
|
//
|
|
// DISALLOW_COPY_AND_ASSIGN(MyWidgetListener);
|
|
// };
|
|
|
|
namespace base {
|
|
|
|
namespace cef_internal {
|
|
|
|
template <typename CallbackType>
|
|
class CallbackListBase {
|
|
public:
|
|
class Subscription {
|
|
public:
|
|
Subscription(CallbackListBase<CallbackType>* list,
|
|
typename std::list<CallbackType>::iterator iter)
|
|
: list_(list),
|
|
iter_(iter) {
|
|
}
|
|
|
|
~Subscription() {
|
|
if (list_->active_iterator_count_) {
|
|
iter_->Reset();
|
|
} else {
|
|
list_->callbacks_.erase(iter_);
|
|
if (!list_->removal_callback_.is_null())
|
|
list_->removal_callback_.Run();
|
|
}
|
|
}
|
|
|
|
private:
|
|
CallbackListBase<CallbackType>* list_;
|
|
typename std::list<CallbackType>::iterator iter_;
|
|
|
|
DISALLOW_COPY_AND_ASSIGN(Subscription);
|
|
};
|
|
|
|
// Add a callback to the list. The callback will remain registered until the
|
|
// returned Subscription is destroyed, which must occur before the
|
|
// CallbackList is destroyed.
|
|
scoped_ptr<Subscription> Add(const CallbackType& cb) WARN_UNUSED_RESULT {
|
|
DCHECK(!cb.is_null());
|
|
return scoped_ptr<Subscription>(
|
|
new Subscription(this, callbacks_.insert(callbacks_.end(), cb)));
|
|
}
|
|
|
|
// Sets a callback which will be run when a subscription list is changed.
|
|
void set_removal_callback(const Closure& callback) {
|
|
removal_callback_ = callback;
|
|
}
|
|
|
|
// Returns true if there are no subscriptions. This is only valid to call when
|
|
// not looping through the list.
|
|
bool empty() {
|
|
DCHECK_EQ(0, active_iterator_count_);
|
|
return callbacks_.empty();
|
|
}
|
|
|
|
protected:
|
|
// An iterator class that can be used to access the list of callbacks.
|
|
class Iterator {
|
|
public:
|
|
explicit Iterator(CallbackListBase<CallbackType>* list)
|
|
: list_(list),
|
|
list_iter_(list_->callbacks_.begin()) {
|
|
++list_->active_iterator_count_;
|
|
}
|
|
|
|
Iterator(const Iterator& iter)
|
|
: list_(iter.list_),
|
|
list_iter_(iter.list_iter_) {
|
|
++list_->active_iterator_count_;
|
|
}
|
|
|
|
~Iterator() {
|
|
if (list_ && --list_->active_iterator_count_ == 0) {
|
|
list_->Compact();
|
|
}
|
|
}
|
|
|
|
CallbackType* GetNext() {
|
|
while ((list_iter_ != list_->callbacks_.end()) && list_iter_->is_null())
|
|
++list_iter_;
|
|
|
|
CallbackType* cb = NULL;
|
|
if (list_iter_ != list_->callbacks_.end()) {
|
|
cb = &(*list_iter_);
|
|
++list_iter_;
|
|
}
|
|
return cb;
|
|
}
|
|
|
|
private:
|
|
CallbackListBase<CallbackType>* list_;
|
|
typename std::list<CallbackType>::iterator list_iter_;
|
|
};
|
|
|
|
CallbackListBase() : active_iterator_count_(0) {}
|
|
|
|
~CallbackListBase() {
|
|
DCHECK_EQ(0, active_iterator_count_);
|
|
DCHECK_EQ(0U, callbacks_.size());
|
|
}
|
|
|
|
// Returns an instance of a CallbackListBase::Iterator which can be used
|
|
// to run callbacks.
|
|
Iterator GetIterator() {
|
|
return Iterator(this);
|
|
}
|
|
|
|
// Compact the list: remove any entries which were NULLed out during
|
|
// iteration.
|
|
void Compact() {
|
|
typename std::list<CallbackType>::iterator it = callbacks_.begin();
|
|
bool updated = false;
|
|
while (it != callbacks_.end()) {
|
|
if ((*it).is_null()) {
|
|
updated = true;
|
|
it = callbacks_.erase(it);
|
|
} else {
|
|
++it;
|
|
}
|
|
|
|
if (updated && !removal_callback_.is_null())
|
|
removal_callback_.Run();
|
|
}
|
|
}
|
|
|
|
private:
|
|
std::list<CallbackType> callbacks_;
|
|
int active_iterator_count_;
|
|
Closure removal_callback_;
|
|
|
|
DISALLOW_COPY_AND_ASSIGN(CallbackListBase);
|
|
};
|
|
|
|
} // namespace cef_internal
|
|
|
|
template <typename Sig> class CallbackList;
|
|
|
|
template <>
|
|
class CallbackList<void(void)>
|
|
: public cef_internal::CallbackListBase<Callback<void(void)> > {
|
|
public:
|
|
typedef Callback<void(void)> CallbackType;
|
|
|
|
CallbackList() {}
|
|
|
|
void Notify() {
|
|
cef_internal::CallbackListBase<CallbackType>::Iterator it =
|
|
this->GetIterator();
|
|
CallbackType* cb;
|
|
while ((cb = it.GetNext()) != NULL) {
|
|
cb->Run();
|
|
}
|
|
}
|
|
|
|
private:
|
|
DISALLOW_COPY_AND_ASSIGN(CallbackList);
|
|
};
|
|
|
|
template <typename A1>
|
|
class CallbackList<void(A1)>
|
|
: public cef_internal::CallbackListBase<Callback<void(A1)> > {
|
|
public:
|
|
typedef Callback<void(A1)> CallbackType;
|
|
|
|
CallbackList() {}
|
|
|
|
void Notify(typename cef_internal::CallbackParamTraits<A1>::ForwardType a1) {
|
|
typename cef_internal::CallbackListBase<CallbackType>::Iterator it =
|
|
this->GetIterator();
|
|
CallbackType* cb;
|
|
while ((cb = it.GetNext()) != NULL) {
|
|
cb->Run(a1);
|
|
}
|
|
}
|
|
|
|
private:
|
|
DISALLOW_COPY_AND_ASSIGN(CallbackList);
|
|
};
|
|
|
|
template <typename A1, typename A2>
|
|
class CallbackList<void(A1, A2)>
|
|
: public cef_internal::CallbackListBase<Callback<void(A1, A2)> > {
|
|
public:
|
|
typedef Callback<void(A1, A2)> CallbackType;
|
|
|
|
CallbackList() {}
|
|
|
|
void Notify(typename cef_internal::CallbackParamTraits<A1>::ForwardType a1,
|
|
typename cef_internal::CallbackParamTraits<A2>::ForwardType a2) {
|
|
typename cef_internal::CallbackListBase<CallbackType>::Iterator it =
|
|
this->GetIterator();
|
|
CallbackType* cb;
|
|
while ((cb = it.GetNext()) != NULL) {
|
|
cb->Run(a1, a2);
|
|
}
|
|
}
|
|
|
|
private:
|
|
DISALLOW_COPY_AND_ASSIGN(CallbackList);
|
|
};
|
|
|
|
template <typename A1, typename A2, typename A3>
|
|
class CallbackList<void(A1, A2, A3)>
|
|
: public cef_internal::CallbackListBase<Callback<void(A1, A2, A3)> > {
|
|
public:
|
|
typedef Callback<void(A1, A2, A3)> CallbackType;
|
|
|
|
CallbackList() {}
|
|
|
|
void Notify(typename cef_internal::CallbackParamTraits<A1>::ForwardType a1,
|
|
typename cef_internal::CallbackParamTraits<A2>::ForwardType a2,
|
|
typename cef_internal::CallbackParamTraits<A3>::ForwardType a3) {
|
|
typename cef_internal::CallbackListBase<CallbackType>::Iterator it =
|
|
this->GetIterator();
|
|
CallbackType* cb;
|
|
while ((cb = it.GetNext()) != NULL) {
|
|
cb->Run(a1, a2, a3);
|
|
}
|
|
}
|
|
|
|
private:
|
|
DISALLOW_COPY_AND_ASSIGN(CallbackList);
|
|
};
|
|
|
|
template <typename A1, typename A2, typename A3, typename A4>
|
|
class CallbackList<void(A1, A2, A3, A4)>
|
|
: public cef_internal::CallbackListBase<Callback<void(A1, A2, A3, A4)> > {
|
|
public:
|
|
typedef Callback<void(A1, A2, A3, A4)> CallbackType;
|
|
|
|
CallbackList() {}
|
|
|
|
void Notify(typename cef_internal::CallbackParamTraits<A1>::ForwardType a1,
|
|
typename cef_internal::CallbackParamTraits<A2>::ForwardType a2,
|
|
typename cef_internal::CallbackParamTraits<A3>::ForwardType a3,
|
|
typename cef_internal::CallbackParamTraits<A4>::ForwardType a4) {
|
|
typename cef_internal::CallbackListBase<CallbackType>::Iterator it =
|
|
this->GetIterator();
|
|
CallbackType* cb;
|
|
while ((cb = it.GetNext()) != NULL) {
|
|
cb->Run(a1, a2, a3, a4);
|
|
}
|
|
}
|
|
|
|
private:
|
|
DISALLOW_COPY_AND_ASSIGN(CallbackList);
|
|
};
|
|
|
|
template <typename A1, typename A2, typename A3, typename A4, typename A5>
|
|
class CallbackList<void(A1, A2, A3, A4, A5)>
|
|
: public cef_internal::CallbackListBase<Callback<void(A1, A2, A3, A4, A5)> > {
|
|
public:
|
|
typedef Callback<void(A1, A2, A3, A4, A5)> CallbackType;
|
|
|
|
CallbackList() {}
|
|
|
|
void Notify(typename cef_internal::CallbackParamTraits<A1>::ForwardType a1,
|
|
typename cef_internal::CallbackParamTraits<A2>::ForwardType a2,
|
|
typename cef_internal::CallbackParamTraits<A3>::ForwardType a3,
|
|
typename cef_internal::CallbackParamTraits<A4>::ForwardType a4,
|
|
typename cef_internal::CallbackParamTraits<A5>::ForwardType a5) {
|
|
typename cef_internal::CallbackListBase<CallbackType>::Iterator it =
|
|
this->GetIterator();
|
|
CallbackType* cb;
|
|
while ((cb = it.GetNext()) != NULL) {
|
|
cb->Run(a1, a2, a3, a4, a5);
|
|
}
|
|
}
|
|
|
|
private:
|
|
DISALLOW_COPY_AND_ASSIGN(CallbackList);
|
|
};
|
|
|
|
template <typename A1, typename A2, typename A3, typename A4, typename A5,
|
|
typename A6>
|
|
class CallbackList<void(A1, A2, A3, A4, A5, A6)>
|
|
: public cef_internal::CallbackListBase<Callback<void(A1, A2, A3, A4, A5,
|
|
A6)> > {
|
|
public:
|
|
typedef Callback<void(A1, A2, A3, A4, A5, A6)> CallbackType;
|
|
|
|
CallbackList() {}
|
|
|
|
void Notify(typename cef_internal::CallbackParamTraits<A1>::ForwardType a1,
|
|
typename cef_internal::CallbackParamTraits<A2>::ForwardType a2,
|
|
typename cef_internal::CallbackParamTraits<A3>::ForwardType a3,
|
|
typename cef_internal::CallbackParamTraits<A4>::ForwardType a4,
|
|
typename cef_internal::CallbackParamTraits<A5>::ForwardType a5,
|
|
typename cef_internal::CallbackParamTraits<A6>::ForwardType a6) {
|
|
typename cef_internal::CallbackListBase<CallbackType>::Iterator it =
|
|
this->GetIterator();
|
|
CallbackType* cb;
|
|
while ((cb = it.GetNext()) != NULL) {
|
|
cb->Run(a1, a2, a3, a4, a5, a6);
|
|
}
|
|
}
|
|
|
|
private:
|
|
DISALLOW_COPY_AND_ASSIGN(CallbackList);
|
|
};
|
|
|
|
template <typename A1, typename A2, typename A3, typename A4, typename A5,
|
|
typename A6, typename A7>
|
|
class CallbackList<void(A1, A2, A3, A4, A5, A6, A7)>
|
|
: public cef_internal::CallbackListBase<Callback<void(A1, A2, A3, A4, A5, A6,
|
|
A7)> > {
|
|
public:
|
|
typedef Callback<void(A1, A2, A3, A4, A5, A6, A7)> CallbackType;
|
|
|
|
CallbackList() {}
|
|
|
|
void Notify(typename cef_internal::CallbackParamTraits<A1>::ForwardType a1,
|
|
typename cef_internal::CallbackParamTraits<A2>::ForwardType a2,
|
|
typename cef_internal::CallbackParamTraits<A3>::ForwardType a3,
|
|
typename cef_internal::CallbackParamTraits<A4>::ForwardType a4,
|
|
typename cef_internal::CallbackParamTraits<A5>::ForwardType a5,
|
|
typename cef_internal::CallbackParamTraits<A6>::ForwardType a6,
|
|
typename cef_internal::CallbackParamTraits<A7>::ForwardType a7) {
|
|
typename cef_internal::CallbackListBase<CallbackType>::Iterator it =
|
|
this->GetIterator();
|
|
CallbackType* cb;
|
|
while ((cb = it.GetNext()) != NULL) {
|
|
cb->Run(a1, a2, a3, a4, a5, a6, a7);
|
|
}
|
|
}
|
|
|
|
private:
|
|
DISALLOW_COPY_AND_ASSIGN(CallbackList);
|
|
};
|
|
|
|
} // namespace base
|
|
|
|
#endif // !BUILDING_CEF_SHARED
|
|
|
|
#endif // CEF_INCLUDE_BASE_CEF_CALLBACK_LIST_H_
|