blob: babc68c81b2a715dcade75a0009b15b23e7a6ba0 [file] [log] [blame]
// 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 "base/macros.h"
#include "ui/events/event_handler.h"
#include "ui/events/events_export.h"
namespace ui {
class EventTarget;
// An EventHandler that replaces an EventTarget's target handler with itself to
// pass events first to the original handler and second to an additional new
// EventHandler. The new handler gets called after the original handler even
// if it calls SetHandled() on the event but not if StopPropagation() is called
// on the event.
class EVENTS_EXPORT ScopedTargetHandler : public EventHandler {
ScopedTargetHandler(EventTarget* target, EventHandler* new_handler);
~ScopedTargetHandler() override;
// EventHandler:
void OnEvent(Event* event) override;
// If non-null the destructor sets this to true. This is set while handling
// an event and used to detect if |this| has been deleted.
bool* destroyed_flag_;
// An EventTarget that has its target handler replaced with |this| for a life
// time of |this|.
EventTarget* target_;
// An EventHandler that gets restored on |view_| when |this| is destroyed.
EventHandler* original_handler_;
// A new handler that gets events in addition to the |original_handler_|.
EventHandler* new_handler_;
} // namespace ui