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 "ash/wm/workspace/workspace_layout_manager.h"
  10 #include "ui/aura/client/aura_constants.h"
  11 #include "ui/aura/window.h"
  12
  13 namespace ash {
  14
  15 AlwaysOnTopController::AlwaysOnTopController(aura::Window* viewport)
  16     : always_on_top_container_(viewport) {
  17   always_on_top_container_->SetLayoutManager(
  18       new WorkspaceLayoutManager(viewport));
  19   // Container should be empty.
  20   DCHECK(always_on_top_container_->children().empty());
  21   always_on_top_container_->AddObserver(this);
  22 }
  23
  24 AlwaysOnTopController::~AlwaysOnTopController() {
  25   if (always_on_top_container_)
  26     always_on_top_container_->RemoveObserver(this);
  27 }
  28
  29 aura::Window* AlwaysOnTopController::GetContainer(aura::Window* window) const {
  30   DCHECK(always_on_top_container_);
  31   if (window->GetProperty(aura::client::kAlwaysOnTopKey))
  32     return always_on_top_container_;
  33   return Shell::GetContainer(always_on_top_container_->GetRootWindow(),
  34                              kShellWindowId_DefaultContainer);
  35 }
  36
  37 void AlwaysOnTopController::OnWindowAdded(aura::Window* child) {
  38   // Observe direct child of the containers.
  39   if (child->parent() == always_on_top_container_)
  40     child->AddObserver(this);
  41 }
  42
  43 void AlwaysOnTopController::SetLayoutManagerForTest(
  44     WorkspaceLayoutManager* layout_manager) {
  45   always_on_top_container_->SetLayoutManager(layout_manager);
  46 }
  47
  48 // TODO(rsadam@): Refactor so that this cast is unneeded.
  49 WorkspaceLayoutManager* AlwaysOnTopController::GetLayoutManager() const {
  50   return static_cast<WorkspaceLayoutManager*>(
  51       always_on_top_container_->layout_manager());
  52 }
  53
  54 void AlwaysOnTopController::OnWillRemoveWindow(aura::Window* child) {
  55   child->RemoveObserver(this);
  56 }
  57
  58 void AlwaysOnTopController::OnWindowPropertyChanged(aura::Window* window,
  59                                                     const void* key,
  60                                                     intptr_t old) {
  61   if (key == aura::client::kAlwaysOnTopKey) {
  62     DCHECK(window->type() == ui::wm::WINDOW_TYPE_NORMAL ||
  63            window->type() == ui::wm::WINDOW_TYPE_POPUP);
  64     aura::Window* container = GetContainer(window);
  65     if (window->parent() != container)
  66       container->AddChild(window);
  67   }
  68 }
  69
  70 void AlwaysOnTopController::OnWindowDestroyed(aura::Window* window) {
  71   if (window == always_on_top_container_)
  72     always_on_top_container_ = NULL;
  73 }
  74
  75 }  // namespace ash