content/renderer/device_orientation_dispatcher.cc

   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 #include "content/renderer/device_orientation_dispatcher.h"
   6
   7 #include "content/common/device_orientation_messages.h"
   8 #include "content/renderer/render_view_impl.h"
   9 #include "third_party/WebKit/Source/WebKit/chromium/public/WebDeviceOrientation.h"
  10 #include "third_party/WebKit/Source/WebKit/chromium/public/WebDeviceOrientationController.h"
  11
  12 namespace content {
  13
  14 DeviceOrientationDispatcher::DeviceOrientationDispatcher(
  15     RenderViewImpl* render_view)
  16     : RenderViewObserver(render_view),
  17       controller_(NULL),
  18       started_(false) {
  19 }
  20
  21 DeviceOrientationDispatcher::~DeviceOrientationDispatcher() {
  22   if (started_)
  23     stopUpdating();
  24 }
  25
  26 bool DeviceOrientationDispatcher::OnMessageReceived(const IPC::Message& msg) {
  27   bool handled = true;
  28   IPC_BEGIN_MESSAGE_MAP(DeviceOrientationDispatcher, msg)
  29     IPC_MESSAGE_HANDLER(DeviceOrientationMsg_Updated,
  30                         OnDeviceOrientationUpdated)
  31     IPC_MESSAGE_UNHANDLED(handled = false)
  32   IPC_END_MESSAGE_MAP()
  33   return handled;
  34 }
  35
  36 void DeviceOrientationDispatcher::setController(
  37     WebKit::WebDeviceOrientationController* controller) {
  38   controller_.reset(controller);
  39 }
  40
  41 void DeviceOrientationDispatcher::startUpdating() {
  42   Send(new DeviceOrientationHostMsg_StartUpdating(routing_id()));
  43   started_ = true;
  44 }
  45
  46 void DeviceOrientationDispatcher::stopUpdating() {
  47   Send(new DeviceOrientationHostMsg_StopUpdating(routing_id()));
  48   started_ = false;
  49 }
  50
  51 WebKit::WebDeviceOrientation DeviceOrientationDispatcher::lastOrientation()
  52     const {
  53    return last_orientation_;
  54 }
  55
  56 namespace {
  57 bool OrientationsEqual(const DeviceOrientationMsg_Updated_Params& a,
  58                        WebKit::WebDeviceOrientation* b) {
  59   if (a.can_provide_alpha != b->canProvideAlpha())
  60     return false;
  61   if (a.can_provide_alpha && a.alpha != b->alpha())
  62     return false;
  63   if (a.can_provide_beta != b->canProvideBeta())
  64     return false;
  65   if (a.can_provide_beta && a.beta != b->beta())
  66     return false;
  67   if (a.can_provide_gamma != b->canProvideGamma())
  68     return false;
  69   if (a.can_provide_gamma && a.gamma != b->gamma())
  70     return false;
  71   if (a.can_provide_absolute != b->canProvideAbsolute())
  72     return false;
  73   if (a.can_provide_absolute && a.absolute != b->absolute())
  74     return false;
  75
  76   return true;
  77 }
  78 }  // namespace
  79
  80 void DeviceOrientationDispatcher::OnDeviceOrientationUpdated(
  81     const DeviceOrientationMsg_Updated_Params& p) {
  82   if (!last_orientation_.isNull() && OrientationsEqual(p, &last_orientation_))
  83     return;
  84
  85   last_orientation_.setNull(false);
  86   if (p.can_provide_alpha)
  87     last_orientation_.setAlpha(p.alpha);
  88   if (p.can_provide_beta)
  89     last_orientation_.setBeta(p.beta);
  90   if (p.can_provide_gamma)
  91     last_orientation_.setGamma(p.gamma);
  92   if (p.can_provide_absolute)
  93     last_orientation_.setAbsolute(p.absolute);
  94   controller_->didChangeDeviceOrientation(last_orientation_);
  95 }
  96
  97 }  // namespace content