ash/display/projecting_observer.cc

   1 // Copyright 2014 The Chromium Authors
   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.h"
   6
   7 #include "ash/shell.h"
   8 #include "ash/system/power/power_event_observer.h"
   9 #include "base/check_op.h"
  10 #include "chromeos/dbus/power/power_manager_client.h"
  11 #include "ui/display/types/display_snapshot.h"
  12
  13 namespace ash {
  14
  15 ProjectingObserver::ProjectingObserver(
  16     display::DisplayConfigurator* display_configurator)
  17     : display_configurator_(display_configurator) {
  18   if (Shell::HasInstance())
  19     Shell::Get()->AddShellObserver(this);
  20   if (display_configurator_)
  21     display_configurator_->AddObserver(this);
  22 }
  23
  24 ProjectingObserver::~ProjectingObserver() {
  25   if (Shell::HasInstance())
  26     Shell::Get()->RemoveShellObserver(this);
  27   if (display_configurator_)
  28     display_configurator_->RemoveObserver(this);
  29 }
  30
  31 void ProjectingObserver::OnDisplayModeChanged(
  32     const display::DisplayConfigurator::DisplayStateList& display_states) {
  33   has_internal_output_ = false;
  34   output_count_ = display_states.size();
  35
  36   for (size_t i = 0; i < display_states.size(); ++i) {
  37     if (display_states[i]->type() ==
  38         display::DISPLAY_CONNECTION_TYPE_INTERNAL) {
  39       has_internal_output_ = true;
  40       break;
  41     }
  42   }
  43
  44   SetIsProjecting();
  45 }
  46
  47 void ProjectingObserver::OnCastingSessionStartedOrStopped(bool started) {
  48   if (started) {
  49     ++casting_session_count_;
  50   } else {
  51     DCHECK_GT(casting_session_count_, 0);
  52     --casting_session_count_;
  53     if (casting_session_count_ < 0)
  54       casting_session_count_ = 0;
  55   }
  56
  57   SetIsProjecting();
  58 }
  59
  60 void ProjectingObserver::SetIsProjecting() {
  61   // "Projecting" is defined as having more than 1 output connected while at
  62   // least one of them is an internal output.
  63   is_projecting_ =
  64       has_internal_output_ && (output_count_ + casting_session_count_ > 1);
  65
  66   chromeos::PowerManagerClient::Get()->SetIsProjecting(is_projecting_);
  67   if (Shell::HasInstance())
  68     Shell::Get()->power_event_observer()->SetIsProjecting(is_projecting_);
  69 }
  70
  71 }  // namespace ash