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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 namespace internal {
     14 
     15 AlwaysOnTopController::AlwaysOnTopController()
     16     : always_on_top_container_(NULL) {
     17 }
     18 
     19 AlwaysOnTopController::~AlwaysOnTopController() {
     20   if (always_on_top_container_)
     21     always_on_top_container_->RemoveObserver(this);
     22 }
     23 
     24 void AlwaysOnTopController::SetAlwaysOnTopContainer(
     25     aura::Window* always_on_top_container) {
     26   // Container should be empty.
     27   DCHECK(always_on_top_container->children().empty());
     28 
     29   // We are not handling any containers yet.
     30   DCHECK(always_on_top_container_ == NULL);
     31 
     32   always_on_top_container_ = always_on_top_container;
     33   always_on_top_container_->AddObserver(this);
     34 }
     35 
     36 aura::Window* AlwaysOnTopController::GetContainer(aura::Window* window) const {
     37   DCHECK(always_on_top_container_);
     38   if (window->GetProperty(aura::client::kAlwaysOnTopKey))
     39     return always_on_top_container_;
     40   return Shell::GetContainer(always_on_top_container_->GetRootWindow(),
     41                              kShellWindowId_DefaultContainer);
     42 }
     43 
     44 void AlwaysOnTopController::OnWindowAdded(aura::Window* child) {
     45   // Observe direct child of the containers.
     46   if (child->parent() == always_on_top_container_)
     47     child->AddObserver(this);
     48 }
     49 
     50 void AlwaysOnTopController::OnWillRemoveWindow(aura::Window* child) {
     51   child->RemoveObserver(this);
     52 }
     53 
     54 void AlwaysOnTopController::OnWindowPropertyChanged(aura::Window* window,
     55                                                     const void* key,
     56                                                     intptr_t old) {
     57   if (key == aura::client::kAlwaysOnTopKey) {
     58     DCHECK(window->type() == aura::client::WINDOW_TYPE_NORMAL ||
     59            window->type() == aura::client::WINDOW_TYPE_POPUP);
     60     aura::Window* container = GetContainer(window);
     61     if (window->parent() != container)
     62       container->AddChild(window);
     63   }
     64 }
     65 
     66 void AlwaysOnTopController::OnWindowDestroyed(aura::Window* window) {
     67   if (window == always_on_top_container_)
     68     always_on_top_container_ = NULL;
     69 }
     70 
     71 }  // namespace internal
     72 }  // namespace ash
     73