chrome/browser/ui/cocoa/event_utils.mm

// Copyright (c) 2012 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.

#import "chrome/browser/ui/cocoa/event_utils.h"

#include "chrome/browser/event_disposition.h"
#include "ui/base/events/event_constants.h"

namespace {

bool isLeftButtonEvent(NSEvent* event) {
  NSEventType type = [event type];
  return type == NSLeftMouseDown ||
    type == NSLeftMouseDragged ||
    type == NSLeftMouseUp;
}

bool isRightButtonEvent(NSEvent* event) {
  NSEventType type = [event type];
  return type == NSRightMouseDown ||
    type == NSRightMouseDragged ||
    type == NSRightMouseUp;
}

bool isMiddleButtonEvent(NSEvent* event) {
  if ([event buttonNumber] != 2)
    return false;

  NSEventType type = [event type];
  return type == NSOtherMouseDown ||
    type == NSOtherMouseDragged ||
    type == NSOtherMouseUp;
}

}  // namespace

namespace event_utils {

// Retrieves a bitsum of ui::EventFlags from NSEvent.
int EventFlagsFromNSEvent(NSEvent* event) {
  NSUInteger modifiers = [event modifierFlags];
  return EventFlagsFromNSEventWithModifiers(event, modifiers);
}

int EventFlagsFromNSEventWithModifiers(NSEvent* event, NSUInteger modifiers) {
  int flags = 0;
  flags |= (modifiers & NSAlphaShiftKeyMask) ? ui::EF_CAPS_LOCK_DOWN : 0;
  flags |= (modifiers & NSShiftKeyMask) ? ui::EF_SHIFT_DOWN : 0;
  flags |= (modifiers & NSControlKeyMask) ? ui::EF_CONTROL_DOWN : 0;
  flags |= (modifiers & NSAlternateKeyMask) ? ui::EF_ALT_DOWN : 0;
  flags |= (modifiers & NSCommandKeyMask) ? ui::EF_COMMAND_DOWN : 0;
  flags |= isLeftButtonEvent(event) ? ui::EF_LEFT_MOUSE_BUTTON : 0;
  flags |= isRightButtonEvent(event) ? ui::EF_RIGHT_MOUSE_BUTTON : 0;
  flags |= isMiddleButtonEvent(event) ? ui::EF_MIDDLE_MOUSE_BUTTON : 0;
  return flags;
}

WindowOpenDisposition WindowOpenDispositionFromNSEvent(NSEvent* event) {
  NSUInteger modifiers = [event modifierFlags];
  return WindowOpenDispositionFromNSEventWithFlags(event, modifiers);
}

WindowOpenDisposition WindowOpenDispositionFromNSEventWithFlags(
    NSEvent* event, NSUInteger modifiers) {
  int event_flags = EventFlagsFromNSEventWithModifiers(event, modifiers);
  return chrome::DispositionFromEventFlags(event_flags);
}

}  // namespace event_utils