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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/shell/window_watcher.h"
      6 
      7 #include "ash/display/display_controller.h"
      8 #include "ash/launcher/launcher.h"
      9 #include "ash/launcher/launcher_model.h"
     10 #include "ash/shelf/shelf_widget.h"
     11 #include "ash/shell.h"
     12 #include "ash/shell_window_ids.h"
     13 #include "ui/aura/root_window.h"
     14 #include "ui/aura/window.h"
     15 #include "ui/gfx/display.h"
     16 
     17 namespace ash {
     18 namespace shell {
     19 
     20 class WindowWatcher::WorkspaceWindowWatcher : public aura::WindowObserver {
     21  public:
     22   explicit WorkspaceWindowWatcher(WindowWatcher* watcher) : watcher_(watcher) {
     23   }
     24 
     25   virtual ~WorkspaceWindowWatcher() {
     26   }
     27 
     28   virtual void OnWindowAdded(aura::Window* new_window) OVERRIDE {
     29     new_window->AddObserver(watcher_);
     30   }
     31 
     32   virtual void OnWillRemoveWindow(aura::Window* window) OVERRIDE {
     33     DCHECK(window->children().empty());
     34     window->RemoveObserver(watcher_);
     35   }
     36 
     37   void RootWindowAdded(aura::RootWindow* root) {
     38     aura::Window* panel_container = ash::Shell::GetContainer(
     39         root,
     40         internal::kShellWindowId_PanelContainer);
     41     panel_container->AddObserver(watcher_);
     42 
     43     aura::Window* container =
     44         Launcher::ForWindow(root)->shelf_widget()->window_container();
     45     container->AddObserver(this);
     46     for (size_t i = 0; i < container->children().size(); ++i)
     47       container->children()[i]->AddObserver(watcher_);
     48   }
     49 
     50   void RootWindowRemoved(aura::RootWindow* root) {
     51     aura::Window* panel_container = ash::Shell::GetContainer(
     52         root,
     53         internal::kShellWindowId_PanelContainer);
     54     panel_container->RemoveObserver(watcher_);
     55 
     56     aura::Window* container =
     57         Launcher::ForWindow(root)->shelf_widget()->window_container();
     58     container->RemoveObserver(this);
     59     for (size_t i = 0; i < container->children().size(); ++i)
     60       container->children()[i]->RemoveObserver(watcher_);
     61   }
     62 
     63  private:
     64   WindowWatcher* watcher_;
     65 
     66   DISALLOW_COPY_AND_ASSIGN(WorkspaceWindowWatcher);
     67 };
     68 
     69 WindowWatcher::WindowWatcher() {
     70   workspace_window_watcher_.reset(new WorkspaceWindowWatcher(this));
     71   Shell::RootWindowList root_windows = Shell::GetAllRootWindows();
     72   for (Shell::RootWindowList::iterator iter = root_windows.begin();
     73        iter != root_windows.end(); ++ iter) {
     74     workspace_window_watcher_->RootWindowAdded(*iter);
     75   }
     76 }
     77 
     78 WindowWatcher::~WindowWatcher() {
     79   Shell::RootWindowList root_windows = Shell::GetAllRootWindows();
     80   for (Shell::RootWindowList::iterator iter = root_windows.begin();
     81        iter != root_windows.end(); ++ iter) {
     82     workspace_window_watcher_->RootWindowRemoved(*iter);
     83   }
     84 }
     85 
     86 aura::Window* WindowWatcher::GetWindowByID(ash::LauncherID id) {
     87   IDToWindow::const_iterator i = id_to_window_.find(id);
     88   return i != id_to_window_.end() ? i->second : NULL;
     89 }
     90 
     91 ash::LauncherID WindowWatcher::GetIDByWindow(aura::Window* window) const {
     92   for (IDToWindow::const_iterator i = id_to_window_.begin();
     93        i != id_to_window_.end(); ++i) {
     94     if (i->second == window)
     95       return i->first;
     96   }
     97   return 0;  // TODO: add a constant for this.
     98 }
     99 
    100 // aura::WindowObserver overrides:
    101 void WindowWatcher::OnWindowAdded(aura::Window* new_window) {
    102   if (new_window->type() != aura::client::WINDOW_TYPE_NORMAL &&
    103       new_window->type() != aura::client::WINDOW_TYPE_PANEL)
    104     return;
    105 
    106   static int image_count = 0;
    107   ash::LauncherModel* model = Shell::GetInstance()->launcher_model();
    108   ash::LauncherItem item;
    109   item.type = new_window->type() == aura::client::WINDOW_TYPE_PANEL ?
    110                                     ash::TYPE_APP_PANEL : ash::TYPE_TABBED;
    111   id_to_window_[model->next_id()] = new_window;
    112 
    113   SkBitmap icon_bitmap;
    114   icon_bitmap.setConfig(SkBitmap::kARGB_8888_Config, 16, 16);
    115   icon_bitmap.allocPixels();
    116   icon_bitmap.eraseARGB(255,
    117                         image_count == 0 ? 255 : 0,
    118                         image_count == 1 ? 255 : 0,
    119                         image_count == 2 ? 255 : 0);
    120   image_count = (image_count + 1) % 3;
    121   item.image = gfx::ImageSkia(gfx::ImageSkiaRep(icon_bitmap,
    122                                                 ui::SCALE_FACTOR_100P));
    123 
    124   model->Add(item);
    125 }
    126 
    127 void WindowWatcher::OnWillRemoveWindow(aura::Window* window) {
    128   for (IDToWindow::iterator i = id_to_window_.begin();
    129        i != id_to_window_.end(); ++i) {
    130     if (i->second == window) {
    131       ash::LauncherModel* model = Shell::GetInstance()->launcher_model();
    132       int index = model->ItemIndexByID(i->first);
    133       DCHECK_NE(-1, index);
    134       model->RemoveItemAt(index);
    135       id_to_window_.erase(i);
    136       break;
    137     }
    138   }
    139 }
    140 
    141 void WindowWatcher::OnDisplayBoundsChanged(const gfx::Display& display) {
    142 }
    143 
    144 void WindowWatcher::OnDisplayAdded(const gfx::Display& new_display) {
    145   aura::RootWindow* root = Shell::GetInstance()->display_controller()->
    146       GetRootWindowForDisplayId(new_display.id());
    147   workspace_window_watcher_->RootWindowAdded(root);
    148 }
    149 
    150 void WindowWatcher::OnDisplayRemoved(const gfx::Display& old_display) {
    151   // All windows in the display has already been removed, so no need to
    152   // remove observers.
    153 }
    154 
    155 }  // namespace shell
    156 }  // namespace ash
    157