ash/wm/always_on_top_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/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() == ui::wm::WINDOW_TYPE_NORMAL ||
  59            window->type() == ui::wm::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