third_party/WebKit/Source/platform/PlatformKeyboardEvent.cpp

/*
 * Copyright (C) 2006, 2007 Apple Inc.  All rights reserved.
 * Copyright (C) 2008, 2009 Google Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. 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.
 */

#include "config.h"
#include "platform/PlatformKeyboardEvent.h"

#if OS(WIN)
#include <windows.h>
#elif OS(MACOSX)
#import <Carbon/Carbon.h>
#else
#include "platform/NotImplemented.h"
#endif

namespace blink {

#if OS(WIN)
static const unsigned short HIGHBITMASKSHORT = 0x8000;
#endif

PlatformKeyboardEvent::OverrideCapsLockState
    PlatformKeyboardEvent::s_overrideCapsLockState =
        PlatformKeyboardEvent::OverrideCapsLockState::Default;

void PlatformKeyboardEvent::disambiguateKeyDownEvent(Type type) {
#if OS(WIN)
  // No KeyDown events on Windows to disambiguate.
  ASSERT_NOT_REACHED();
#else
  // Can only change type from KeyDown to RawKeyDown or Char, as we lack
  // information for other conversions.
  ASSERT(m_type == PlatformEvent::KeyDown);
  ASSERT(type == PlatformEvent::RawKeyDown || type == PlatformEvent::Char);
  m_type = type;

  if (type == RawKeyDown) {
    m_text = String();
    m_unmodifiedText = String();
  } else {
    m_keyIdentifier = String();
    m_windowsVirtualKeyCode = 0;
#if OS(MACOSX)
    if (m_text.length() == 1 &&
        (m_text[0U] >= 0xF700 && m_text[0U] <= 0xF7FF)) {
      // According to NSEvents.h, OpenStep reserves the range 0xF700-0xF8FF for
      // function keys. However, some actual private use characters
      // happen to be in this range, e.g. the Apple logo (Option+Shift+K).
      // 0xF7FF is an arbitrary cut-off.
      m_text = String();
      m_unmodifiedText = String();
    }
#endif
  }
#endif
}

bool PlatformKeyboardEvent::currentCapsLockState() {
  switch (s_overrideCapsLockState) {
    case OverrideCapsLockState::Default:
#if OS(WIN)
      // FIXME: Does this even work inside the sandbox?
      return GetKeyState(VK_CAPITAL) & 1;
#elif OS(MACOSX)
      return GetCurrentKeyModifiers() & alphaLock;
#else
      notImplemented();
      return false;
#endif
    case OverrideCapsLockState::On:
      return true;
    case OverrideCapsLockState::Off:
    default:
      return false;
  }
}

void PlatformKeyboardEvent::getCurrentModifierState(bool& shiftKey,
                                                    bool& ctrlKey,
                                                    bool& altKey,
                                                    bool& metaKey) {
#if OS(WIN)
  shiftKey = GetKeyState(VK_SHIFT) & HIGHBITMASKSHORT;
  ctrlKey = GetKeyState(VK_CONTROL) & HIGHBITMASKSHORT;
  altKey = GetKeyState(VK_MENU) & HIGHBITMASKSHORT;
  metaKey = false;
#elif OS(MACOSX)
  UInt32 currentModifiers = GetCurrentKeyModifiers();
  shiftKey = currentModifiers & ::shiftKey;
  ctrlKey = currentModifiers & ::controlKey;
  altKey = currentModifiers & ::optionKey;
  metaKey = currentModifiers & ::cmdKey;
#else
  shiftKey = false;
  ctrlKey = false;
  altKey = false;
  metaKey = false;
  notImplemented();
#endif
}

}  // namespace blink