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