ui/aura/env.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 "ui/aura/env.h"
   6
   7 #include "base/command_line.h"
   8 #include "base/message_loop/message_pump_dispatcher.h"
   9 #include "ui/aura/env_observer.h"
  10 #include "ui/aura/input_state_lookup.h"
  11 #include "ui/aura/window.h"
  12 #include "ui/compositor/compositor.h"
  13 #include "ui/compositor/compositor_switches.h"
  14 #include "ui/events/event_target_iterator.h"
  15
  16 #if defined(USE_X11)
  17 #include "base/message_loop/message_pump_x11.h"
  18 #endif
  19
  20 namespace aura {
  21
  22 // static
  23 Env* Env::instance_ = NULL;
  24
  25 ////////////////////////////////////////////////////////////////////////////////
  26 // Env, public:
  27
  28 Env::Env()
  29     : mouse_button_flags_(0),
  30       is_touch_down_(false),
  31       input_state_lookup_(InputStateLookup::Create().Pass()) {
  32 }
  33
  34 Env::~Env() {
  35 #if defined(USE_X11)
  36   base::MessagePumpX11::Current()->RemoveObserver(
  37       &device_list_updater_aurax11_);
  38 #endif
  39
  40   FOR_EACH_OBSERVER(EnvObserver, observers_, OnWillDestroyEnv());
  41
  42   ui::Compositor::Terminate();
  43 }
  44
  45 //static
  46 void Env::CreateInstance() {
  47   if (!instance_) {
  48     instance_ = new Env;
  49     instance_->Init();
  50   }
  51 }
  52
  53 // static
  54 Env* Env::GetInstance() {
  55   DCHECK(instance_) << "Env::CreateInstance must be called before getting "
  56                        "the instance of Env.";
  57   return instance_;
  58 }
  59
  60 // static
  61 void Env::DeleteInstance() {
  62   delete instance_;
  63   instance_ = NULL;
  64 }
  65
  66 void Env::AddObserver(EnvObserver* observer) {
  67   observers_.AddObserver(observer);
  68 }
  69
  70 void Env::RemoveObserver(EnvObserver* observer) {
  71   observers_.RemoveObserver(observer);
  72 }
  73
  74 bool Env::IsMouseButtonDown() const {
  75   return input_state_lookup_.get() ? input_state_lookup_->IsMouseButtonDown() :
  76       mouse_button_flags_ != 0;
  77 }
  78
  79 ////////////////////////////////////////////////////////////////////////////////
  80 // Env, private:
  81
  82 void Env::Init() {
  83 #if defined(USE_X11)
  84   // We can't do this with a root window listener because XI_HierarchyChanged
  85   // messages don't have a target window.
  86   base::MessagePumpX11::Current()->AddObserver(
  87       &device_list_updater_aurax11_);
  88 #endif
  89   ui::Compositor::Initialize();
  90 }
  91
  92 void Env::NotifyWindowInitialized(Window* window) {
  93   FOR_EACH_OBSERVER(EnvObserver, observers_, OnWindowInitialized(window));
  94 }
  95
  96 void Env::NotifyHostInitialized(WindowTreeHost* host) {
  97   FOR_EACH_OBSERVER(EnvObserver, observers_, OnHostInitialized(host));
  98 }
  99
 100 void Env::NotifyHostActivated(WindowTreeHost* host) {
 101   FOR_EACH_OBSERVER(EnvObserver, observers_, OnHostActivated(host));
 102 }
 103
 104 ////////////////////////////////////////////////////////////////////////////////
 105 // Env, ui::EventTarget implementation:
 106
 107 bool Env::CanAcceptEvent(const ui::Event& event) {
 108   return true;
 109 }
 110
 111 ui::EventTarget* Env::GetParentTarget() {
 112   return NULL;
 113 }
 114
 115 scoped_ptr<ui::EventTargetIterator> Env::GetChildIterator() const {
 116   return scoped_ptr<ui::EventTargetIterator>();
 117 }
 118
 119 ui::EventTargeter* Env::GetEventTargeter() {
 120   NOTREACHED();
 121   return NULL;
 122 }
 123
 124 }  // namespace aura