src/athena/screen/screen_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/screen/public/screen_manager.h"
   6
   7 #include "athena/common/container_priorities.h"
   8 #include "athena/common/fill_layout_manager.h"
   9 #include "athena/input/public/accelerator_manager.h"
  10 #include "athena/screen/background_controller.h"
  11 #include "athena/screen/screen_accelerator_handler.h"
  12 #include "base/logging.h"
  13 #include "base/memory/scoped_ptr.h"
  14 #include "ui/aura/client/screen_position_client.h"
  15 #include "ui/aura/client/window_tree_client.h"
  16 #include "ui/aura/layout_manager.h"
  17 #include "ui/aura/test/test_screen.h"
  18 #include "ui/aura/window.h"
  19 #include "ui/aura/window_property.h"
  20 #include "ui/aura/window_targeter.h"
  21 #include "ui/aura/window_tree_host.h"
  22 #include "ui/compositor/layer.h"
  23 #include "ui/gfx/display.h"
  24 #include "ui/gfx/screen.h"
  25 #include "ui/wm/core/base_focus_rules.h"
  26 #include "ui/wm/core/capture_controller.h"
  27
  28 namespace athena {
  29 namespace {
  30
  31 DEFINE_OWNED_WINDOW_PROPERTY_KEY(ScreenManager::ContainerParams,
  32                                  kContainerParamsKey,
  33                                  NULL);
  34
  35 ScreenManager* instance = NULL;
  36
  37 bool GrabsInput(aura::Window* container) {
  38   ScreenManager::ContainerParams* params =
  39       container->GetProperty(kContainerParamsKey);
  40   return params && params->grab_inputs;
  41 }
  42
  43 // Returns the container which contains |window|.
  44 aura::Window* GetContainer(aura::Window* window) {
  45   // No containers for NULL or the root window itself.
  46   if (!window || !window->parent())
  47     return NULL;
  48   if (window->parent()->IsRootWindow())
  49     return window;
  50   return GetContainer(window->parent());
  51 }
  52
  53 class AthenaFocusRules : public wm::BaseFocusRules {
  54  public:
  55   AthenaFocusRules() {}
  56   virtual ~AthenaFocusRules() {}
  57
  58   // wm::BaseFocusRules:
  59   virtual bool SupportsChildActivation(aura::Window* window) const OVERRIDE {
  60     ScreenManager::ContainerParams* params =
  61         window->GetProperty(kContainerParamsKey);
  62     return params && params->can_activate_children;
  63   }
  64   virtual bool CanActivateWindow(aura::Window* window) const OVERRIDE {
  65     // Check if containers of higher z-order than |window| have 'grab_inputs'
  66     // fields.
  67     if (window) {
  68       const aura::Window::Windows& containers =
  69           window->GetRootWindow()->children();
  70       aura::Window::Windows::const_iterator iter =
  71           std::find(containers.begin(), containers.end(), GetContainer(window));
  72       DCHECK(iter != containers.end());
  73       for (++iter; iter != containers.end(); ++iter) {
  74         if (GrabsInput(*iter))
  75           return false;
  76       }
  77     }
  78     return BaseFocusRules::CanActivateWindow(window);
  79   }
  80
  81  private:
  82   DISALLOW_COPY_AND_ASSIGN(AthenaFocusRules);
  83 };
  84
  85 class AthenaWindowTreeClient : public aura::client::WindowTreeClient {
  86  public:
  87   explicit AthenaWindowTreeClient(aura::Window* container)
  88       : container_(container) {}
  89
  90  private:
  91   virtual ~AthenaWindowTreeClient() {}
  92
  93   // aura::client::WindowTreeClient:
  94   virtual aura::Window* GetDefaultParent(aura::Window* context,
  95                                          aura::Window* window,
  96                                          const gfx::Rect& bounds) OVERRIDE {
  97     return container_;
  98   }
  99
 100   aura::Window* container_;
 101
 102   DISALLOW_COPY_AND_ASSIGN(AthenaWindowTreeClient);
 103 };
 104
 105 class AthenaScreenPositionClient : public aura::client::ScreenPositionClient {
 106  public:
 107   AthenaScreenPositionClient() {
 108   }
 109   virtual ~AthenaScreenPositionClient() {
 110   }
 111
 112  private:
 113   // aura::client::ScreenPositionClient:
 114   virtual void ConvertPointToScreen(const aura::Window* window,
 115                                     gfx::Point* point) OVERRIDE {
 116     const aura::Window* root = window->GetRootWindow();
 117     aura::Window::ConvertPointToTarget(window, root, point);
 118   }
 119
 120   virtual void ConvertPointFromScreen(const aura::Window* window,
 121                                       gfx::Point* point) OVERRIDE {
 122     const aura::Window* root = window->GetRootWindow();
 123     aura::Window::ConvertPointToTarget(root, window, point);
 124   }
 125
 126   virtual void ConvertHostPointToScreen(aura::Window* window,
 127                                         gfx::Point* point) OVERRIDE {
 128     // TODO(oshima): Implement this when adding multiple display support.
 129     NOTREACHED();
 130   }
 131
 132   virtual void SetBounds(aura::Window* window,
 133                          const gfx::Rect& bounds,
 134                          const gfx::Display& display) OVERRIDE {
 135     window->SetBounds(bounds);
 136   }
 137
 138   DISALLOW_COPY_AND_ASSIGN(AthenaScreenPositionClient);
 139 };
 140
 141 class AthenaEventTargeter : public aura::WindowTargeter,
 142                             public aura::WindowObserver {
 143  public:
 144   explicit AthenaEventTargeter(aura::Window* container)
 145       : container_(container) {
 146     container_->AddObserver(this);
 147   }
 148
 149   virtual ~AthenaEventTargeter() {
 150     // Removed before the container is removed.
 151     if (container_)
 152       container_->RemoveObserver(this);
 153   }
 154
 155  private:
 156   // aura::WindowTargeter:
 157   virtual bool SubtreeCanAcceptEvent(
 158       ui::EventTarget* target,
 159       const ui::LocatedEvent& event) const OVERRIDE {
 160     aura::Window* window = static_cast<aura::Window*>(target);
 161     const aura::Window::Windows& containers =
 162         container_->GetRootWindow()->children();
 163     aura::Window::Windows::const_iterator iter =
 164         std::find(containers.begin(), containers.end(), container_);
 165     DCHECK(iter != containers.end());
 166     for (; iter != containers.end(); ++iter) {
 167       if ((*iter)->Contains(window))
 168         return true;
 169     }
 170     return false;
 171   }
 172
 173   // aura::WindowObserver:
 174   virtual void OnWindowDestroying(aura::Window* window) OVERRIDE {
 175     aura::Window* root_window = container_->GetRootWindow();
 176     DCHECK_EQ(window, container_);
 177     DCHECK_EQ(
 178         this, static_cast<ui::EventTarget*>(root_window)->GetEventTargeter());
 179
 180     container_->RemoveObserver(this);
 181     container_ = NULL;
 182
 183     // This will remove myself.
 184     root_window->SetEventTargeter(scoped_ptr<ui::EventTargeter>());
 185   }
 186
 187   aura::Window* container_;
 188
 189   DISALLOW_COPY_AND_ASSIGN(AthenaEventTargeter);
 190 };
 191
 192 class ScreenManagerImpl : public ScreenManager {
 193  public:
 194   explicit ScreenManagerImpl(aura::Window* root_window);
 195   virtual ~ScreenManagerImpl();
 196
 197   void Init();
 198
 199  private:
 200   // ScreenManager:
 201   virtual aura::Window* CreateDefaultContainer(
 202       const ContainerParams& params) OVERRIDE;
 203   virtual aura::Window* CreateContainer(const ContainerParams& params) OVERRIDE;
 204   virtual aura::Window* GetContext() OVERRIDE { return root_window_; }
 205   virtual void SetBackgroundImage(const gfx::ImageSkia& image) OVERRIDE;
 206   virtual void SetRotation(gfx::Display::Rotation rotation) OVERRIDE;
 207   virtual ui::LayerAnimator* GetScreenAnimator() OVERRIDE;
 208
 209   aura::Window* root_window_;
 210   aura::Window* background_window_;
 211
 212   scoped_ptr<BackgroundController> background_controller_;
 213   scoped_ptr<aura::client::WindowTreeClient> window_tree_client_;
 214   scoped_ptr<AcceleratorHandler> accelerator_handler_;
 215   scoped_ptr< ::wm::ScopedCaptureClient> capture_client_;
 216   scoped_ptr<aura::client::ScreenPositionClient> screen_position_client_;
 217
 218   DISALLOW_COPY_AND_ASSIGN(ScreenManagerImpl);
 219 };
 220
 221 ScreenManagerImpl::ScreenManagerImpl(aura::Window* root_window)
 222     : root_window_(root_window) {
 223   DCHECK(root_window_);
 224   DCHECK(!instance);
 225   instance = this;
 226 }
 227
 228 ScreenManagerImpl::~ScreenManagerImpl() {
 229   aura::client::SetScreenPositionClient(root_window_, NULL);
 230   aura::client::SetWindowTreeClient(root_window_, NULL);
 231   instance = NULL;
 232 }
 233
 234 void ScreenManagerImpl::Init() {
 235   // TODO(oshima): Move the background out from ScreenManager.
 236   root_window_->SetLayoutManager(new FillLayoutManager(root_window_));
 237   background_window_ =
 238       CreateContainer(ContainerParams("AthenaBackground", CP_BACKGROUND));
 239
 240   background_window_->SetLayoutManager(
 241       new FillLayoutManager(background_window_));
 242   background_controller_.reset(new BackgroundController(background_window_));
 243
 244   capture_client_.reset(new ::wm::ScopedCaptureClient(root_window_));
 245   accelerator_handler_.reset(new ScreenAcceleratorHandler(root_window_));
 246 }
 247
 248 aura::Window* ScreenManagerImpl::CreateDefaultContainer(
 249     const ContainerParams& params) {
 250   aura::Window* container = CreateContainer(params);
 251   window_tree_client_.reset(new AthenaWindowTreeClient(container));
 252   aura::client::SetWindowTreeClient(root_window_, window_tree_client_.get());
 253
 254   screen_position_client_.reset(new AthenaScreenPositionClient());
 255   aura::client::SetScreenPositionClient(root_window_,
 256                                         screen_position_client_.get());
 257
 258   return container;
 259 }
 260
 261 // A functor to find a container that has the higher priority.
 262 struct HigherPriorityFinder {
 263   HigherPriorityFinder(int p) : priority(p) {}
 264   bool operator()(aura::Window* window) {
 265     return window->GetProperty(kContainerParamsKey)->z_order_priority >
 266            priority;
 267   }
 268   int priority;
 269 };
 270
 271 #if !defined(NDEBUG)
 272 struct PriorityMatcher {
 273   PriorityMatcher(int p) : priority(p) {}
 274   bool operator()(aura::Window* window) {
 275     return window->GetProperty(kContainerParamsKey)->z_order_priority ==
 276            priority;
 277   }
 278   int priority;
 279 };
 280 #endif
 281
 282 aura::Window* ScreenManagerImpl::CreateContainer(
 283     const ContainerParams& params) {
 284   aura::Window* container = new aura::Window(NULL);
 285   CHECK_GE(params.z_order_priority, 0);
 286   container->Init(aura::WINDOW_LAYER_NOT_DRAWN);
 287   container->SetName(params.name);
 288
 289   const aura::Window::Windows& children = root_window_->children();
 290
 291 #if !defined(NDEBUG)
 292   DCHECK(std::find_if(children.begin(),
 293                       children.end(),
 294                       PriorityMatcher(params.z_order_priority))
 295          == children.end())
 296       << "The container with the priority "
 297       << params.z_order_priority << " already exists.";
 298 #endif
 299
 300   container->SetProperty(kContainerParamsKey, new ContainerParams(params));
 301
 302   // If another container is already grabbing the input, SetEventTargeter
 303   // implicitly release the grabbing and remove the EventTargeter instance.
 304   // TODO(mukai|oshima): think about the ideal behavior of multiple grabbing
 305   // and implement it.
 306   if (params.grab_inputs) {
 307     DCHECK(std::find_if(children.begin(), children.end(), &GrabsInput)
 308            == children.end())
 309         << "input has already been grabbed by another container";
 310     root_window_->SetEventTargeter(
 311         scoped_ptr<ui::EventTargeter>(new AthenaEventTargeter(container)));
 312   }
 313
 314   root_window_->AddChild(container);
 315
 316   aura::Window::Windows::const_iterator iter =
 317       std::find_if(children.begin(),
 318                    children.end(),
 319                    HigherPriorityFinder(params.z_order_priority));
 320   if (iter != children.end())
 321     root_window_->StackChildBelow(container, *iter);
 322
 323   container->Show();
 324   return container;
 325 }
 326
 327 void ScreenManagerImpl::SetBackgroundImage(const gfx::ImageSkia& image) {
 328   background_controller_->SetImage(image);
 329 }
 330
 331 void ScreenManagerImpl::SetRotation(gfx::Display::Rotation rotation) {
 332   if (rotation ==
 333       gfx::Screen::GetNativeScreen()->GetPrimaryDisplay().rotation()) {
 334     return;
 335   }
 336
 337   // TODO(flackr): Use display manager to update display rotation:
 338   // http://crbug.com/401044.
 339   static_cast<aura::TestScreen*>(gfx::Screen::GetNativeScreen())->
 340       SetDisplayRotation(rotation);
 341 }
 342
 343 ui::LayerAnimator* ScreenManagerImpl::GetScreenAnimator() {
 344   return root_window_->layer()->GetAnimator();
 345 }
 346
 347 }  // namespace
 348
 349 ScreenManager::ContainerParams::ContainerParams(const std::string& n,
 350                                                 int priority)
 351     : name(n),
 352       can_activate_children(false),
 353       grab_inputs(false),
 354       z_order_priority(priority) {
 355 }
 356
 357 // static
 358 ScreenManager* ScreenManager::Create(aura::Window* root_window) {
 359   (new ScreenManagerImpl(root_window))->Init();
 360   DCHECK(instance);
 361   return instance;
 362 }
 363
 364 // static
 365 ScreenManager* ScreenManager::Get() {
 366   DCHECK(instance);
 367   return instance;
 368 }
 369
 370 // static
 371 void ScreenManager::Shutdown() {
 372   DCHECK(instance);
 373   delete instance;
 374   DCHECK(!instance);
 375 }
 376
 377 // static
 378 wm::FocusRules* ScreenManager::CreateFocusRules() {
 379   return new AthenaFocusRules();
 380 }
 381
 382 }  // namespace athena