blob: 732b77731df66c1ab54bf866848c04940f874c56 [file] [log] [blame]
// Copyright 2015 The Chromium Authors
// 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)
: target_(target), new_handler_(handler) {
original_handler_ = target_->SetTargetHandler(this);
}
ScopedTargetHandler::~ScopedTargetHandler() {
EventHandler* handler = target_->SetTargetHandler(original_handler_);
DCHECK_EQ(this, handler);
}
void ScopedTargetHandler::OnEvent(Event* event) {
if (original_handler_) {
auto weak_this = weak_factory_.GetWeakPtr();
original_handler_->OnEvent(event);
if (!weak_this)
return;
}
// This check is needed due to nested event loops when starting DragDrop.
if (event->stopped_propagation())
return;
new_handler_->OnEvent(event);
}
base::StringPiece ScopedTargetHandler::GetLogContext() const {
return "ScopedTargetHandler";
}
} // namespace ui