ash/wm/stacking_controller.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 "ash/wm/stacking_controller.h"
   6
   7 #include "ash/display/display_controller.h"
   8 #include "ash/session_state_delegate.h"
   9 #include "ash/shell.h"
  10 #include "ash/shell_window_ids.h"
  11 #include "ash/wm/always_on_top_controller.h"
  12 #include "ash/wm/coordinate_conversion.h"
  13 #include "ash/wm/window_properties.h"
  14 #include "ui/aura/client/aura_constants.h"
  15 #include "ui/aura/root_window.h"
  16 #include "ui/aura/window.h"
  17 #include "ui/base/ui_base_types.h"
  18
  19 namespace ash {
  20 namespace {
  21
  22 // Find a root window that matches the |bounds|. If the virtual screen
  23 // coordinates is enabled and the bounds is specified, the root window
  24 // that matches the window's bound will be used. Otherwise, it'll
  25 // return the active root window.
  26 aura::RootWindow* FindContainerRoot(const gfx::Rect& bounds) {
  27   if (bounds.x() == 0 && bounds.y() == 0 && bounds.IsEmpty())
  28     return Shell::GetActiveRootWindow();
  29   return wm::GetRootWindowMatching(bounds);
  30 }
  31
  32 aura::Window* GetContainerById(aura::RootWindow* root, int id) {
  33   return Shell::GetContainer(root, id);
  34 }
  35
  36 aura::Window* GetContainerForWindow(aura::Window* window) {
  37   aura::Window* container = window->parent();
  38   while (container && container->type() != aura::client::WINDOW_TYPE_UNKNOWN)
  39     container = container->parent();
  40   return container;
  41 }
  42
  43 bool IsSystemModal(aura::Window* window) {
  44   return window->GetProperty(aura::client::kModalKey) == ui::MODAL_TYPE_SYSTEM;
  45 }
  46
  47 bool HasTransientParentWindow(aura::Window* window) {
  48   return window->transient_parent() &&
  49       window->transient_parent()->type() != aura::client::WINDOW_TYPE_UNKNOWN;
  50 }
  51
  52 bool IsPanelAttached(aura::Window* window) {
  53   return window->GetProperty(internal::kPanelAttachedKey);
  54 }
  55
  56 }  // namespace
  57
  58 ////////////////////////////////////////////////////////////////////////////////
  59 // StackingController, public:
  60
  61 StackingController::StackingController() {
  62 }
  63
  64 StackingController::~StackingController() {
  65 }
  66
  67 ////////////////////////////////////////////////////////////////////////////////
  68 // StackingController, aura::StackingClient implementation:
  69
  70 aura::Window* StackingController::GetDefaultParent(aura::Window* context,
  71                                                    aura::Window* window,
  72                                                    const gfx::Rect& bounds) {
  73   aura::RootWindow* target_root = NULL;
  74   if (window->transient_parent()) {
  75     // Transient window should use the same root as its transient parent.
  76     target_root = window->transient_parent()->GetRootWindow();
  77   } else {
  78     target_root = FindContainerRoot(bounds);
  79   }
  80
  81   switch (window->type()) {
  82     case aura::client::WINDOW_TYPE_NORMAL:
  83     case aura::client::WINDOW_TYPE_POPUP:
  84       if (IsSystemModal(window))
  85         return GetSystemModalContainer(target_root, window);
  86       else if (HasTransientParentWindow(window))
  87         return GetContainerForWindow(window->transient_parent());
  88       return GetAlwaysOnTopController(target_root)->GetContainer(window);
  89     case aura::client::WINDOW_TYPE_CONTROL:
  90       return GetContainerById(
  91           target_root, internal::kShellWindowId_UnparentedControlContainer);
  92     case aura::client::WINDOW_TYPE_PANEL:
  93       if (IsPanelAttached(window))
  94         return GetContainerById(target_root,
  95                                 internal::kShellWindowId_PanelContainer);
  96       else
  97         return GetAlwaysOnTopController(target_root)->GetContainer(window);
  98     case aura::client::WINDOW_TYPE_MENU:
  99       return GetContainerById(
 100           target_root, internal::kShellWindowId_MenuContainer);
 101     case aura::client::WINDOW_TYPE_TOOLTIP:
 102       return GetContainerById(
 103           target_root, internal::kShellWindowId_DragImageAndTooltipContainer);
 104     default:
 105       NOTREACHED() << "Window " << window->id()
 106                    << " has unhandled type " << window->type();
 107       break;
 108   }
 109   return NULL;
 110 }
 111
 112 ////////////////////////////////////////////////////////////////////////////////
 113 // StackingController, private:
 114
 115 aura::Window* StackingController::GetSystemModalContainer(
 116     aura::RootWindow* root,
 117     aura::Window* window) const {
 118   DCHECK(IsSystemModal(window));
 119
 120   // If screen lock is not active and user session is active,
 121   // all modal windows are placed into the normal modal container.
 122   // In case of missing transient parent (it could happen for alerts from
 123   // background pages) assume that the window belongs to user session.
 124   SessionStateDelegate* session_state_delegate =
 125       Shell::GetInstance()->session_state_delegate();
 126   if ((!session_state_delegate->IsScreenLocked() &&
 127        session_state_delegate->IsActiveUserSessionStarted()) ||
 128       !window->transient_parent()) {
 129     return GetContainerById(root,
 130                             internal::kShellWindowId_SystemModalContainer);
 131   }
 132
 133   // Otherwise those that originate from LockScreen container and above are
 134   // placed in the screen lock modal container.
 135   int window_container_id = window->transient_parent()->parent()->id();
 136   aura::Window* container = NULL;
 137   if (window_container_id < internal::kShellWindowId_LockScreenContainer) {
 138     container = GetContainerById(
 139         root, internal::kShellWindowId_SystemModalContainer);
 140   } else {
 141     container = GetContainerById(
 142         root, internal::kShellWindowId_LockSystemModalContainer);
 143   }
 144
 145   return container;
 146 }
 147
 148 // TODO(oshima): Remove this once extended desktop is on by default.
 149 internal::AlwaysOnTopController*
 150 StackingController::GetAlwaysOnTopController(aura::RootWindow* root_window) {
 151   internal::AlwaysOnTopController* controller =
 152       root_window->GetProperty(internal::kAlwaysOnTopControllerKey);
 153   if (!controller) {
 154     controller = new internal::AlwaysOnTopController;
 155     controller->SetAlwaysOnTopContainer(
 156         root_window->GetChildById(
 157             internal::kShellWindowId_AlwaysOnTopContainer));
 158     // RootWindow owns the AlwaysOnTopController object.
 159     root_window->SetProperty(internal::kAlwaysOnTopControllerKey, controller);
 160   }
 161   return controller;
 162 }
 163
 164 }  // namespace ash