third_party/WebKit/Source/core/events/UIEventWithKeyState.h

/*
 * Copyright (C) 2001 Peter Kelly (pmk@post.com)
 * Copyright (C) 2001 Tobias Anton (anton@stud.fbi.fh-darmstadt.de)
 * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
 * Copyright (C) 2003, 2004, 2005, 2006, 2008 Apple Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

#ifndef UIEventWithKeyState_h
#define UIEventWithKeyState_h

#include "core/CoreExport.h"
#include "core/events/EventModifierInit.h"
#include "core/events/UIEvent.h"

namespace blink {

class CORE_EXPORT UIEventWithKeyState : public UIEvent {
 public:
  bool ctrlKey() const { return m_modifiers & PlatformEvent::CtrlKey; }
  bool shiftKey() const { return m_modifiers & PlatformEvent::ShiftKey; }
  bool altKey() const { return m_modifiers & PlatformEvent::AltKey; }
  bool metaKey() const { return m_modifiers & PlatformEvent::MetaKey; }

  // We ignore the new tab modifiers (ctrl or meta, depending on OS) set by
  // JavaScript when processing events.  However, scripts running in isolated
  // worlds (aka content scripts) are not subject to this restriction. Since it
  // is possible that an event created by a content script is caught and
  // recreated by the web page's script, we resort to a global flag.
  static bool newTabModifierSetFromIsolatedWorld() {
    return s_newTabModifierSetFromIsolatedWorld;
  }
  static void clearNewTabModifierSetFromIsolatedWorld() {
    s_newTabModifierSetFromIsolatedWorld = false;
  }
  static void didCreateEventInIsolatedWorld(bool ctrlKey,
                                            bool shiftKey,
                                            bool altKey,
                                            bool metaKey);

  static void setFromPlatformModifiers(EventModifierInit&,
                                       const PlatformEvent::Modifiers);

  bool getModifierState(const String& keyIdentifier) const;

  PlatformEvent::Modifiers modifiers() const {
    return static_cast<PlatformEvent::Modifiers>(m_modifiers);
  }

 protected:
  UIEventWithKeyState() : m_modifiers(0) {}

  UIEventWithKeyState(const AtomicString& type,
                      bool canBubble,
                      bool cancelable,
                      AbstractView*,
                      int detail,
                      PlatformEvent::Modifiers,
                      double platformTimeStamp,
                      InputDeviceCapabilities* sourceCapabilities = nullptr);
  UIEventWithKeyState(const AtomicString& type,
                      const EventModifierInit& initializer);
  void initModifiers(bool ctrlKey, bool altKey, bool shiftKey, bool metaKey);

  unsigned m_modifiers;

 private:
  static bool s_newTabModifierSetFromIsolatedWorld;
};

UIEventWithKeyState* findEventWithKeyState(Event*);

}  // namespace blink

#endif  // UIEventWithKeyState_h