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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/events/scoped_target_handler.h"
#include "ui/events/event.h"
#include "ui/events/event_handler.h"
#include "ui/events/event_target.h"
namespace ui {
ScopedTargetHandler::ScopedTargetHandler(EventTarget* target,
EventHandler* handler)
: destroyed_flag_(NULL), target_(target), new_handler_(handler) {
original_handler_ = target_->SetTargetHandler(this);
}
ScopedTargetHandler::~ScopedTargetHandler() {
EventHandler* handler = target_->SetTargetHandler(original_handler_);
DCHECK_EQ(this, handler);
if (destroyed_flag_)
*destroyed_flag_ = true;
}
void ScopedTargetHandler::OnEvent(Event* event) {
if (original_handler_) {
bool destroyed = false;
bool* old_destroyed_flag = destroyed_flag_;
destroyed_flag_ = &destroyed;
original_handler_->OnEvent(event);
if (destroyed) {
if (old_destroyed_flag)
*old_destroyed_flag = true;
return;
}
destroyed_flag_ = old_destroyed_flag;
}
new_handler_->OnEvent(event);
}
} // namespace ui
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