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      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/always_on_top_controller.h"
      6 
      7 #include "ash/shell.h"
      8 #include "ash/shell_window_ids.h"
      9 #include "ui/aura/client/aura_constants.h"
     10 #include "ui/aura/window.h"
     11 
     12 namespace ash {
     13 
     14 AlwaysOnTopController::AlwaysOnTopController()
     15     : always_on_top_container_(NULL) {
     16 }
     17 
     18 AlwaysOnTopController::~AlwaysOnTopController() {
     19   if (always_on_top_container_)
     20     always_on_top_container_->RemoveObserver(this);
     21 }
     22 
     23 void AlwaysOnTopController::SetAlwaysOnTopContainer(
     24     aura::Window* always_on_top_container) {
     25   // Container should be empty.
     26   DCHECK(always_on_top_container->children().empty());
     27 
     28   // We are not handling any containers yet.
     29   DCHECK(always_on_top_container_ == NULL);
     30 
     31   always_on_top_container_ = always_on_top_container;
     32   always_on_top_container_->AddObserver(this);
     33 }
     34 
     35 aura::Window* AlwaysOnTopController::GetContainer(aura::Window* window) const {
     36   DCHECK(always_on_top_container_);
     37   if (window->GetProperty(aura::client::kAlwaysOnTopKey))
     38     return always_on_top_container_;
     39   return Shell::GetContainer(always_on_top_container_->GetRootWindow(),
     40                              kShellWindowId_DefaultContainer);
     41 }
     42 
     43 void AlwaysOnTopController::OnWindowAdded(aura::Window* child) {
     44   // Observe direct child of the containers.
     45   if (child->parent() == always_on_top_container_)
     46     child->AddObserver(this);
     47 }
     48 
     49 void AlwaysOnTopController::OnWillRemoveWindow(aura::Window* child) {
     50   child->RemoveObserver(this);
     51 }
     52 
     53 void AlwaysOnTopController::OnWindowPropertyChanged(aura::Window* window,
     54                                                     const void* key,
     55                                                     intptr_t old) {
     56   if (key == aura::client::kAlwaysOnTopKey) {
     57     DCHECK(window->type() == ui::wm::WINDOW_TYPE_NORMAL ||
     58            window->type() == ui::wm::WINDOW_TYPE_POPUP);
     59     aura::Window* container = GetContainer(window);
     60     if (window->parent() != container)
     61       container->AddChild(window);
     62   }
     63 }
     64 
     65 void AlwaysOnTopController::OnWindowDestroyed(aura::Window* window) {
     66   if (window == always_on_top_container_)
     67     always_on_top_container_ = NULL;
     68 }
     69 
     70 }  // namespace ash
     71