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_state.h"
  14 #include "ui/aura/client/aura_constants.h"
  15 #include "ui/aura/window.h"
  16 #include "ui/aura/window_event_dispatcher.h"
  17 #include "ui/base/ui_base_types.h"
  18 #include "ui/wm/core/window_util.h"
  19
  20 namespace ash {
  21 namespace {
  22
  23 // Find a root window that matches the |bounds|. If the virtual screen
  24 // coordinates is enabled and the bounds is specified, the root window
  25 // that matches the window's bound will be used. Otherwise, it'll
  26 // return the active root window.
  27 aura::Window* FindContainerRoot(const gfx::Rect& bounds) {
  28   if (bounds.x() == 0 && bounds.y() == 0 && bounds.IsEmpty())
  29     return Shell::GetTargetRootWindow();
  30   return wm::GetRootWindowMatching(bounds);
  31 }
  32
  33 aura::Window* GetContainerById(aura::Window* root, int id) {
  34   return Shell::GetContainer(root, id);
  35 }
  36
  37 bool IsSystemModal(aura::Window* window) {
  38   return window->GetProperty(aura::client::kModalKey) == ui::MODAL_TYPE_SYSTEM;
  39 }
  40
  41 bool HasTransientParentWindow(const aura::Window* window) {
  42   return ::wm::GetTransientParent(window) &&
  43       ::wm::GetTransientParent(window)->type() !=
  44       ui::wm::WINDOW_TYPE_UNKNOWN;
  45 }
  46
  47 AlwaysOnTopController* GetAlwaysOnTopController(aura::Window* root_window) {
  48   return GetRootWindowController(root_window)->always_on_top_controller();
  49 }
  50
  51 }  // namespace
  52
  53 ////////////////////////////////////////////////////////////////////////////////
  54 // StackingController, public:
  55
  56 StackingController::StackingController() {
  57 }
  58
  59 StackingController::~StackingController() {
  60 }
  61
  62 ////////////////////////////////////////////////////////////////////////////////
  63 // StackingController, aura::client::WindowTreeClient implementation:
  64
  65 aura::Window* StackingController::GetDefaultParent(aura::Window* context,
  66                                                    aura::Window* window,
  67                                                    const gfx::Rect& bounds) {
  68   aura::Window* target_root = NULL;
  69   aura::Window* transient_parent = ::wm::GetTransientParent(window);
  70   if (transient_parent) {
  71     // Transient window should use the same root as its transient parent.
  72     target_root = transient_parent->GetRootWindow();
  73   } else {
  74     target_root = FindContainerRoot(bounds);
  75   }
  76
  77   switch (window->type()) {
  78     case ui::wm::WINDOW_TYPE_NORMAL:
  79     case ui::wm::WINDOW_TYPE_POPUP:
  80       if (IsSystemModal(window))
  81         return GetSystemModalContainer(target_root, window);
  82       else if (HasTransientParentWindow(window))
  83         return RootWindowController::GetContainerForWindow(
  84             ::wm::GetTransientParent(window));
  85       return GetAlwaysOnTopController(target_root)->GetContainer(window);
  86     case ui::wm::WINDOW_TYPE_CONTROL:
  87       return GetContainerById(target_root,
  88                               kShellWindowId_UnparentedControlContainer);
  89     case ui::wm::WINDOW_TYPE_PANEL:
  90       if (wm::GetWindowState(window)->panel_attached())
  91         return GetContainerById(target_root, kShellWindowId_PanelContainer);
  92       else
  93         return GetAlwaysOnTopController(target_root)->GetContainer(window);
  94     case ui::wm::WINDOW_TYPE_MENU:
  95       return GetContainerById(target_root, kShellWindowId_MenuContainer);
  96     case ui::wm::WINDOW_TYPE_TOOLTIP:
  97       return GetContainerById(target_root,
  98                               kShellWindowId_DragImageAndTooltipContainer);
  99     default:
 100       NOTREACHED() << "Window " << window->id()
 101                    << " has unhandled type " << window->type();
 102       break;
 103   }
 104   return NULL;
 105 }
 106
 107 ////////////////////////////////////////////////////////////////////////////////
 108 // StackingController, private:
 109
 110 aura::Window* StackingController::GetSystemModalContainer(
 111     aura::Window* root,
 112     aura::Window* window) const {
 113   DCHECK(IsSystemModal(window));
 114
 115   // If screen lock is not active and user session is active,
 116   // all modal windows are placed into the normal modal container.
 117   // In case of missing transient parent (it could happen for alerts from
 118   // background pages) assume that the window belongs to user session.
 119   SessionStateDelegate* session_state_delegate =
 120       Shell::GetInstance()->session_state_delegate();
 121   if (!session_state_delegate->IsUserSessionBlocked() ||
 122       !::wm::GetTransientParent(window)) {
 123     return GetContainerById(root, kShellWindowId_SystemModalContainer);
 124   }
 125
 126   // Otherwise those that originate from LockScreen container and above are
 127   // placed in the screen lock modal container.
 128   int window_container_id =
 129       ::wm::GetTransientParent(window)->parent()->id();
 130   aura::Window* container = NULL;
 131   if (window_container_id < kShellWindowId_LockScreenContainer) {
 132     container = GetContainerById(root, kShellWindowId_SystemModalContainer);
 133   } else {
 134     container = GetContainerById(root, kShellWindowId_LockSystemModalContainer);
 135   }
 136
 137   return container;
 138 }
 139
 140 }  // namespace ash