ash/display/projecting_observer_chromeos.cc

   1 // Copyright 2014 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 "ash/display/projecting_observer_chromeos.h"
   6
   7 #include "base/logging.h"
   8 #include "chromeos/dbus/power_manager_client.h"
   9 #include "ui/display/types/display_snapshot.h"
  10
  11 namespace ash {
  12
  13 ProjectingObserver::ProjectingObserver(
  14     chromeos::PowerManagerClient* power_manager_client)
  15     : has_internal_output_(false),
  16       output_count_(0),
  17       casting_session_count_(0),
  18       power_manager_client_(power_manager_client) {
  19   DCHECK(power_manager_client);
  20 }
  21
  22 ProjectingObserver::~ProjectingObserver() {}
  23
  24 void ProjectingObserver::OnDisplayModeChanged(
  25     const ui::DisplayConfigurator::DisplayStateList& display_states) {
  26   has_internal_output_ = false;
  27   output_count_ = display_states.size();
  28
  29   for (size_t i = 0; i < display_states.size(); ++i) {
  30     if (display_states[i]->type() == ui::DISPLAY_CONNECTION_TYPE_INTERNAL) {
  31       has_internal_output_ = true;
  32       break;
  33     }
  34   }
  35
  36   SetIsProjecting();
  37 }
  38
  39 void ProjectingObserver::OnCastingSessionStartedOrStopped(bool started) {
  40   if (started) {
  41     ++casting_session_count_;
  42   } else {
  43     DCHECK_GT(casting_session_count_, 0);
  44     --casting_session_count_;
  45     if (casting_session_count_ < 0)
  46       casting_session_count_ = 0;
  47   }
  48
  49   SetIsProjecting();
  50 }
  51
  52 void ProjectingObserver::SetIsProjecting() {
  53   // "Projecting" is defined as having more than 1 output connected while at
  54   // least one of them is an internal output.
  55   bool projecting = has_internal_output_ &&
  56       (output_count_ + casting_session_count_ > 1);
  57
  58   power_manager_client_->SetIsProjecting(projecting);
  59 }
  60
  61 }  // namespace ash