content/browser/device_orientation/orientation.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_BROWSER_DEVICE_ORIENTATION_ORIENTATION_H_
   6 #define CONTENT_BROWSER_DEVICE_ORIENTATION_ORIENTATION_H_
   7
   8 #include "base/compiler_specific.h"
   9 #include "content/browser/device_orientation/device_data.h"
  10 #include "content/common/content_export.h"
  11
  12 namespace content {
  13
  14 class Orientation : public DeviceData {
  15  public:
  16   // alpha, beta, gamma and absolute are the rotations around the axes as
  17   // specified in http://dev.w3.org/geo/api/spec-source-orientation.html
  18   //
  19   // can_provide_{alpha,beta,gamma,absolute} is true if data can be provided
  20   // for that variable.
  21   CONTENT_EXPORT Orientation();
  22
  23   // From DeviceData.
  24   virtual IPC::Message* CreateIPCMessage(int render_view_id) const OVERRIDE;
  25   virtual bool ShouldFireEvent(const DeviceData* old_data) const OVERRIDE;
  26
  27   void set_alpha(double alpha) {
  28     can_provide_alpha_ = true;
  29     alpha_ = alpha;
  30   }
  31   bool can_provide_alpha() const { return can_provide_alpha_; }
  32   double alpha() const { return alpha_; }
  33
  34   void set_beta(double beta) {
  35     can_provide_beta_ = true;
  36     beta_ = beta;
  37   }
  38   bool can_provide_beta() const { return can_provide_beta_; }
  39   double beta() const { return beta_; }
  40
  41   void set_gamma(double gamma) {
  42     can_provide_gamma_ = true;
  43     gamma_ = gamma;
  44   }
  45   bool can_provide_gamma() const { return can_provide_gamma_; }
  46   double gamma() const { return gamma_; }
  47
  48   void set_absolute(bool absolute) {
  49     can_provide_absolute_ = true;
  50     absolute_ = absolute;
  51   }
  52   bool can_provide_absolute() const { return can_provide_absolute_; }
  53   bool absolute() const { return absolute_; }
  54
  55  private:
  56   virtual ~Orientation();
  57
  58   static bool IsElementSignificantlyDifferent(bool can_provide_element1,
  59       bool can_provide_element2, double element1, double element2);
  60
  61   double alpha_;
  62   double beta_;
  63   double gamma_;
  64   bool absolute_;
  65   bool can_provide_alpha_;
  66   bool can_provide_beta_;
  67   bool can_provide_gamma_;
  68   bool can_provide_absolute_;
  69 };
  70
  71 }  // namespace content
  72
  73 #endif  // CONTENT_BROWSER_DEVICE_ORIENTATION_ORIENTATION_H_