content/common/gamepad_user_gesture.cc

// 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.

#include "content/common/gamepad_user_gesture.h"

#include <math.h>

#include <algorithm>

#include "third_party/WebKit/public/platform/WebGamepads.h"

namespace {
// A big enough deadzone to detect accidental presses.
const float kAxisMoveAmountThreshold = 0.5;
}

namespace content {

bool GamepadsHaveUserGesture(const blink::WebGamepads& gamepads) {
  for (unsigned int i = 0; i < blink::WebGamepads::itemsLengthCap; i++) {
    const blink::WebGamepad& pad = gamepads.items[i];

    // If the device is physically connected, then check the buttons and axes
    // to see if there is currently an intentional user action.
    if (pad.connected) {
      for (unsigned int button_index = 0; button_index < pad.buttonsLength;
           button_index++) {
        if (pad.buttons[button_index].pressed)
          return true;
      }

      for (unsigned int axes_index = 0; axes_index < pad.axesLength;
           axes_index++) {
        if (fabs(pad.axes[axes_index]) > kAxisMoveAmountThreshold)
          return true;
      }
    }
  }
  return false;
}

}  // namespace content