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/root_window_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 internal::AlwaysOnTopController*
  57 GetAlwaysOnTopController(aura::RootWindow* root_window) {
  58   return internal::GetRootWindowController(root_window)->
  59       always_on_top_controller();
  60 }
  61
  62 }  // namespace
  63
  64 ////////////////////////////////////////////////////////////////////////////////
  65 // StackingController, public:
  66
  67 StackingController::StackingController() {
  68 }
  69
  70 StackingController::~StackingController() {
  71 }
  72
  73 ////////////////////////////////////////////////////////////////////////////////
  74 // StackingController, aura::StackingClient implementation:
  75
  76 aura::Window* StackingController::GetDefaultParent(aura::Window* context,
  77                                                    aura::Window* window,
  78                                                    const gfx::Rect& bounds) {
  79   aura::RootWindow* target_root = NULL;
  80   if (window->transient_parent()) {
  81     // Transient window should use the same root as its transient parent.
  82     target_root = window->transient_parent()->GetRootWindow();
  83   } else {
  84     target_root = FindContainerRoot(bounds);
  85   }
  86
  87   switch (window->type()) {
  88     case aura::client::WINDOW_TYPE_NORMAL:
  89     case aura::client::WINDOW_TYPE_POPUP:
  90       if (IsSystemModal(window))
  91         return GetSystemModalContainer(target_root, window);
  92       else if (HasTransientParentWindow(window))
  93         return GetContainerForWindow(window->transient_parent());
  94       return GetAlwaysOnTopController(target_root)->GetContainer(window);
  95     case aura::client::WINDOW_TYPE_CONTROL:
  96       return GetContainerById(
  97           target_root, internal::kShellWindowId_UnparentedControlContainer);
  98     case aura::client::WINDOW_TYPE_PANEL:
  99       if (IsPanelAttached(window))
 100         return GetContainerById(target_root,
 101                                 internal::kShellWindowId_PanelContainer);
 102       else
 103         return GetAlwaysOnTopController(target_root)->GetContainer(window);
 104     case aura::client::WINDOW_TYPE_MENU:
 105       return GetContainerById(
 106           target_root, internal::kShellWindowId_MenuContainer);
 107     case aura::client::WINDOW_TYPE_TOOLTIP:
 108       return GetContainerById(
 109           target_root, internal::kShellWindowId_DragImageAndTooltipContainer);
 110     default:
 111       NOTREACHED() << "Window " << window->id()
 112                    << " has unhandled type " << window->type();
 113       break;
 114   }
 115   return NULL;
 116 }
 117
 118 ////////////////////////////////////////////////////////////////////////////////
 119 // StackingController, private:
 120
 121 aura::Window* StackingController::GetSystemModalContainer(
 122     aura::RootWindow* root,
 123     aura::Window* window) const {
 124   DCHECK(IsSystemModal(window));
 125
 126   // If screen lock is not active and user session is active,
 127   // all modal windows are placed into the normal modal container.
 128   // In case of missing transient parent (it could happen for alerts from
 129   // background pages) assume that the window belongs to user session.
 130   SessionStateDelegate* session_state_delegate =
 131       Shell::GetInstance()->session_state_delegate();
 132   if (!session_state_delegate->IsUserSessionBlocked() ||
 133       !window->transient_parent()) {
 134     return GetContainerById(root,
 135                             internal::kShellWindowId_SystemModalContainer);
 136   }
 137
 138   // Otherwise those that originate from LockScreen container and above are
 139   // placed in the screen lock modal container.
 140   int window_container_id = window->transient_parent()->parent()->id();
 141   aura::Window* container = NULL;
 142   if (window_container_id < internal::kShellWindowId_LockScreenContainer) {
 143     container = GetContainerById(
 144         root, internal::kShellWindowId_SystemModalContainer);
 145   } else {
 146     container = GetContainerById(
 147         root, internal::kShellWindowId_LockSystemModalContainer);
 148   }
 149
 150   return container;
 151 }
 152
 153 }  // namespace ash