Home | History | Annotate | Download | only in wm 
      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/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::Window* FindContainerRoot(const gfx::Rect& bounds) {
     27   if (bounds.x() == 0 && bounds.y() == 0 && bounds.IsEmpty())
     28     return Shell::GetTargetRootWindow();
     29   return wm::GetRootWindowMatching(bounds);
     30 }
     31 
     32 aura::Window* GetContainerById(aura::Window* root, int id) {
     33   return Shell::GetContainer(root, id);
     34 }
     35 
     36 bool IsSystemModal(aura::Window* window) {
     37   return window->GetProperty(aura::client::kModalKey) == ui::MODAL_TYPE_SYSTEM;
     38 }
     39 
     40 bool HasTransientParentWindow(aura::Window* window) {
     41   return window->transient_parent() &&
     42       window->transient_parent()->type() != aura::client::WINDOW_TYPE_UNKNOWN;
     43 }
     44 
     45 internal::AlwaysOnTopController*
     46 GetAlwaysOnTopController(aura::Window* root_window) {
     47   return internal::GetRootWindowController(root_window)->
     48       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   if (window->transient_parent()) {
     70     // Transient window should use the same root as its transient parent.
     71     target_root = window->transient_parent()->GetRootWindow();
     72   } else {
     73     target_root = FindContainerRoot(bounds);
     74   }
     75 
     76   switch (window->type()) {
     77     case aura::client::WINDOW_TYPE_NORMAL:
     78     case aura::client::WINDOW_TYPE_POPUP:
     79       if (IsSystemModal(window))
     80         return GetSystemModalContainer(target_root, window);
     81       else if (HasTransientParentWindow(window))
     82         return internal::RootWindowController::GetContainerForWindow(
     83             window->transient_parent());
     84       return GetAlwaysOnTopController(target_root)->GetContainer(window);
     85     case aura::client::WINDOW_TYPE_CONTROL:
     86       return GetContainerById(
     87           target_root, internal::kShellWindowId_UnparentedControlContainer);
     88     case aura::client::WINDOW_TYPE_PANEL:
     89       if (wm::GetWindowState(window)->panel_attached())
     90         return GetContainerById(target_root,
     91                                 internal::kShellWindowId_PanelContainer);
     92       else
     93         return GetAlwaysOnTopController(target_root)->GetContainer(window);
     94     case aura::client::WINDOW_TYPE_MENU:
     95       return GetContainerById(
     96           target_root, internal::kShellWindowId_MenuContainer);
     97     case aura::client::WINDOW_TYPE_TOOLTIP:
     98       return GetContainerById(
     99           target_root, internal::kShellWindowId_DragImageAndTooltipContainer);
    100     default:
    101       NOTREACHED() << "Window " << window->id()
    102                    << " has unhandled type " << window->type();
    103       break;
    104   }
    105   return NULL;
    106 }
    107 
    108 ////////////////////////////////////////////////////////////////////////////////
    109 // StackingController, private:
    110 
    111 aura::Window* StackingController::GetSystemModalContainer(
    112     aura::Window* root,
    113     aura::Window* window) const {
    114   DCHECK(IsSystemModal(window));
    115 
    116   // If screen lock is not active and user session is active,
    117   // all modal windows are placed into the normal modal container.
    118   // In case of missing transient parent (it could happen for alerts from
    119   // background pages) assume that the window belongs to user session.
    120   SessionStateDelegate* session_state_delegate =
    121       Shell::GetInstance()->session_state_delegate();
    122   if (!session_state_delegate->IsUserSessionBlocked() ||
    123       !window->transient_parent()) {
    124     return GetContainerById(root,
    125                             internal::kShellWindowId_SystemModalContainer);
    126   }
    127 
    128   // Otherwise those that originate from LockScreen container and above are
    129   // placed in the screen lock modal container.
    130   int window_container_id = window->transient_parent()->parent()->id();
    131   aura::Window* container = NULL;
    132   if (window_container_id < internal::kShellWindowId_LockScreenContainer) {
    133     container = GetContainerById(
    134         root, internal::kShellWindowId_SystemModalContainer);
    135   } else {
    136     container = GetContainerById(
    137         root, internal::kShellWindowId_LockSystemModalContainer);
    138   }
    139 
    140   return container;
    141 }
    142 
    143 }  // namespace ash
    144