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/always_on_top_controller.h"
      6 
      7 #include "ash/shell.h"
      8 #include "ash/shell_window_ids.h"
      9 #include "ash/wm/property_util.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 Shell::GetContainer(always_on_top_container_->GetRootWindow(),
     42                              kShellWindowId_DefaultContainer);
     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
     74