src/athena/activity/activity_manager_impl.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 "athena/activity/activity_manager_impl.h"
   6
   7 #include <algorithm>
   8
   9 #include "athena/activity/activity_widget_delegate.h"
  10 #include "athena/activity/public/activity.h"
  11 #include "athena/activity/public/activity_manager_observer.h"
  12 #include "athena/activity/public/activity_view_model.h"
  13 #include "athena/screen/public/screen_manager.h"
  14 #include "base/logging.h"
  15 #include "base/observer_list.h"
  16 #include "ui/aura/window.h"
  17 #include "ui/views/widget/widget.h"
  18 #include "ui/wm/public/activation_client.h"
  19
  20 namespace athena {
  21
  22 namespace {
  23
  24 ActivityManager* instance = nullptr;
  25
  26 views::Widget* CreateWidget(Activity* activity) {
  27   aura::Window* window = activity->GetWindow();
  28   views::Widget* widget =
  29       window ? views::Widget::GetWidgetForNativeView(window) : nullptr;
  30   if (widget)
  31     return widget;
  32   widget = new views::Widget;
  33   views::Widget::InitParams params(views::Widget::InitParams::TYPE_WINDOW);
  34   params.delegate =
  35       new ActivityWidgetDelegate(activity->GetActivityViewModel());
  36   widget->Init(params);
  37   return widget;
  38 }
  39
  40 views::Widget* GetWidget(Activity* activity) {
  41   CHECK(activity);
  42   CHECK(activity->GetWindow());
  43   return views::Widget::GetWidgetForNativeWindow(activity->GetWindow());
  44 }
  45
  46 }  // namespace
  47
  48 ActivityManagerImpl::ActivityManagerImpl() {
  49   CHECK(!instance);
  50   instance = this;
  51
  52   aura::Window* root_window =
  53       ScreenManager::Get()->GetContext()->GetRootWindow();
  54   aura::client::GetActivationClient(root_window)->AddObserver(this);
  55 }
  56
  57 ActivityManagerImpl::~ActivityManagerImpl() {
  58   aura::Window* root_window =
  59       ScreenManager::Get()->GetContext()->GetRootWindow();
  60   aura::client::GetActivationClient(root_window)->RemoveObserver(this);
  61   while (!activities_.empty())
  62     Activity::Delete(activities_.front());
  63
  64   CHECK_EQ(this, instance);
  65   instance = nullptr;
  66 }
  67
  68 void ActivityManagerImpl::AddActivity(Activity* activity) {
  69   CHECK(activities_.end() ==
  70         std::find(activities_.begin(), activities_.end(), activity));
  71   activities_.insert(activities_.begin(), activity);
  72   views::Widget* widget = CreateWidget(activity);
  73   widget->GetNativeView()->AddObserver(this);
  74   activity->GetActivityViewModel()->Init();
  75
  76   FOR_EACH_OBSERVER(ActivityManagerObserver,
  77                     observers_,
  78                     OnActivityStarted(activity));
  79 }
  80
  81 void ActivityManagerImpl::RemoveActivity(Activity* activity) {
  82   std::vector<Activity*>::iterator find =
  83       std::find(activities_.begin(), activities_.end(), activity);
  84   DCHECK(find != activities_.end());
  85   if (find != activities_.end()) {
  86     FOR_EACH_OBSERVER(
  87         ActivityManagerObserver, observers_, OnActivityEnding(activity));
  88     activities_.erase(find);
  89     views::Widget* widget = GetWidget(activity);
  90     widget->GetNativeView()->RemoveObserver(this);
  91     widget->Close();
  92   }
  93 }
  94
  95 const ActivityList& ActivityManagerImpl::GetActivityList() {
  96   return activities_;
  97 }
  98
  99 Activity* ActivityManagerImpl::GetActivityForWindow(aura::Window* window) {
 100   struct Matcher {
 101     Matcher(aura::Window* w) : window(w) {}
 102     bool operator()(Activity* activity) {
 103       return activity->GetWindow() == window;
 104     }
 105     aura::Window* window;
 106   };
 107   std::vector<Activity*>::iterator iter =
 108       std::find_if(activities_.begin(), activities_.end(), Matcher(window));
 109   return iter != activities_.end() ? *iter : nullptr;
 110 }
 111
 112 void ActivityManagerImpl::AddObserver(ActivityManagerObserver* observer) {
 113   observers_.AddObserver(observer);
 114 }
 115
 116 void ActivityManagerImpl::RemoveObserver(ActivityManagerObserver* observer) {
 117   observers_.RemoveObserver(observer);
 118 }
 119
 120 void ActivityManagerImpl::OnWindowDestroying(aura::Window* window) {
 121   Activity* activity = GetActivityForWindow(window);
 122   if (activity) {
 123     window->RemoveObserver(this);
 124     Activity::Delete(activity);
 125   }
 126 }
 127
 128 void ActivityManagerImpl::OnWindowActivated(aura::Window* gained_active,
 129                                             aura::Window* lost_active) {
 130   Activity* activity = GetActivityForWindow(gained_active);
 131   if (!activity)
 132     return;
 133   CHECK(!activities_.empty());
 134   if (activity == activities_.front())
 135     return;
 136   // Move the activity for |gained_active| at the front of the list.
 137   ActivityList::reverse_iterator iter = std::find(activities_.rbegin(),
 138                                                   activities_.rend(),
 139                                                   activity);
 140   CHECK(iter != activities_.rend());
 141   std::rotate(iter, iter + 1, activities_.rend());
 142   FOR_EACH_OBSERVER(ActivityManagerObserver,
 143                     observers_,
 144                     OnActivityOrderChanged());
 145 }
 146
 147 // static
 148 ActivityManager* ActivityManager::Create() {
 149   new ActivityManagerImpl();
 150   CHECK(instance);
 151   return instance;
 152 }
 153
 154 ActivityManager* ActivityManager::Get() {
 155   return instance;
 156 }
 157
 158 void ActivityManager::Shutdown() {
 159   CHECK(instance);
 160   delete instance;
 161 }
 162
 163
 164 }  // namespace athena