Enable user change background image in settings page in Aura build.

ash/shell.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/shell.h"
 
 #include <algorithm>
 
 #include "ash/app_list/app_list.h"
 #include "ash/ash_switches.h"
+#include "ash/desktop_background/desktop_background_controller.h"
+#include "ash/desktop_background/desktop_background_resources.h"
+#include "ash/desktop_background/desktop_background_view.h"
 #include "ash/drag_drop/drag_drop_controller.h"
 #include "ash/focus_cycler.h"
 #include "ash/ime/input_method_event_filter.h"
 #include "ash/launcher/launcher.h"
 #include "ash/shell_delegate.h"
 #include "ash/shell_factory.h"
 #include "ash/shell_window_ids.h"
 #include "ash/system/audio/tray_volume.h"
 #include "ash/system/brightness/tray_brightness.h"
 #include "ash/system/settings/tray_settings.h"
@@ skipping 450 matching lines @@
 
   window_modality_controller_.reset(new internal::WindowModalityController);
   AddRootWindowEventFilter(window_modality_controller_.get());
 
   visibility_controller_.reset(new internal::VisibilityController);
 
   tooltip_controller_.reset(new internal::TooltipController);
   AddRootWindowEventFilter(tooltip_controller_.get());
 
   drag_drop_controller_.reset(new internal::DragDropController);
+  desktop_background_controller_.reset(new DesktopBackgroundController);
   power_button_controller_.reset(new PowerButtonController);
   video_detector_.reset(new VideoDetector);
   window_cycle_controller_.reset(new WindowCycleController);
 }
 
 Shell::WindowMode Shell::ComputeWindowMode(CommandLine* command_line) const {
   // Some devices don't perform well with overlapping windows.
   if (command_line->HasSwitch(switches::kAuraForceCompactWindowMode))
     return MODE_COMPACT;
 
@@ skipping 40 matching lines @@
   if (workspace_controller_.get())
     workspace_controller_->ShowMenu(widget, location);
 }
 
 void Shell::ToggleAppList() {
   if (!app_list_.get())
     app_list_.reset(new internal::AppList);
   app_list_->SetVisible(!app_list_->IsVisible());
 }
 
-void Shell::SetDesktopBackgroundMode(BackgroundMode mode) {
-  if (mode == BACKGROUND_SOLID_COLOR) {
-    // Set a solid black background.
-    // TODO(derat): Remove this in favor of having the compositor only clear the
-    // viewport when there are regions not covered by a layer:
-    // http://crbug.com/113445
-    ui::Layer* background_layer = new ui::Layer(ui::Layer::LAYER_SOLID_COLOR);
-    background_layer->SetColor(SK_ColorBLACK);
-    GetContainer(internal::kShellWindowId_DesktopBackgroundContainer)->
-        layer()->Add(background_layer);
-    root_window_layout_->SetBackgroundLayer(background_layer);
-    root_window_layout_->SetBackgroundWidget(NULL);
-  } else {
-    // Create the desktop background image.
-    root_window_layout_->SetBackgroundLayer(NULL);
-    root_window_layout_->SetBackgroundWidget(
-        internal::CreateDesktopBackground());
-  }
-  desktop_background_mode_ = mode;
+void Shell::SetDesktopBackgroundWallpaper(const SkBitmap& wallpaper) {
+  if (desktop_background_mode_ == BACKGROUND_SOLID_COLOR)
+    return;
+
+  DCHECK(root_window_layout_->background_widget());
+  static_cast<internal::DesktopBackgroundView*>(
+      root_window_layout_->background_widget()->widget_delegate())->
+      SetWallpaper(wallpaper);
+}
+
+void Shell::SetDesktopBackgroundImageMode(const SkBitmap& wallpaper) {
+  root_window_layout_->SetBackgroundLayer(NULL);
+  root_window_layout_->SetBackgroundWidget(
+      internal::CreateDesktopBackground(wallpaper));
+  desktop_background_mode_ = BACKGROUND_IMAGE;
+}
+
+void Shell::SetDesktopBackgroundSolidColorMode() {
+  // Set a solid black background.
+  // TODO(derat): Remove this in favor of having the compositor only clear the
+  // viewport when there are regions not covered by a layer:
+  // http://crbug.com/113445
+  ui::Layer* background_layer = new ui::Layer(ui::Layer::LAYER_SOLID_COLOR);
+  background_layer->SetColor(SK_ColorBLACK);
+  GetContainer(internal::kShellWindowId_DesktopBackgroundContainer)->
+      layer()->Add(background_layer);
+  root_window_layout_->SetBackgroundLayer(background_layer);
+  root_window_layout_->SetBackgroundWidget(NULL);
+  desktop_background_mode_ = BACKGROUND_SOLID_COLOR;
 }
 
 bool Shell::IsScreenLocked() const {
   const aura::Window* lock_screen_container = GetContainer(
       internal::kShellWindowId_LockScreenContainer);
   return lock_screen_container->StopsEventPropagation();
 }
 
 bool Shell::IsModalWindowOpen() const {
   const aura::Window* modal_container = GetContainer(
@@ skipping 58 matching lines @@
       new internal::CompactStatusAreaLayoutManager(status_widget_);
   GetContainer(internal::kShellWindowId_StatusContainer)->
       SetLayoutManager(status_area_layout_manager);
   default_container->SetLayoutManager(compact_layout_manager);
 
   // Keep the launcher for its data model, but hide it.  Do this before
   // maximizing the windows so the work area is the right size.
   launcher_->widget()->Hide();
 
   // Set a solid black background.
-  SetDesktopBackgroundMode(BACKGROUND_SOLID_COLOR);
+  SetDesktopBackgroundSolidColorMode();
 }
 
 void Shell::SetupManagedWindowMode() {
   DCHECK(root_window_layout_);
   DCHECK(status_widget_);
 
   internal::ShelfLayoutManager* shelf_layout_manager =
       new internal::ShelfLayoutManager(launcher_->widget(), status_widget_);
   GetContainer(internal::kShellWindowId_LauncherContainer)->
       SetLayoutManager(shelf_layout_manager);
   shelf_ = shelf_layout_manager;
 
   internal::StatusAreaLayoutManager* status_area_layout_manager =
       new internal::StatusAreaLayoutManager(shelf_layout_manager);
   GetContainer(internal::kShellWindowId_StatusContainer)->
       SetLayoutManager(status_area_layout_manager);
 
   aura::Window* default_container =
       GetContainer(internal::kShellWindowId_DefaultContainer);
   // Workspace manager has its own layout managers.
   workspace_controller_.reset(
       new internal::WorkspaceController(default_container));
   workspace_controller_->workspace_manager()->set_shelf(shelf_layout_manager);
 
   // Ensure launcher is visible.
   launcher_->widget()->Show();
 
   // Create the desktop background image.
-  SetDesktopBackgroundMode(BACKGROUND_IMAGE);
+  SetDesktopBackgroundImageMode(desktop_background_controller_->
+                                GetPresetWallpaper());

[flackr, 2012/03/08 01:19:59]

Indent 4 more spaces as this isn't another argument to
SetDesktopBackgroundImageMode but a continuation of previous line.

[bshe, 2012/03/08 03:19:24]

Done.

 }
 
 void Shell::ResetLayoutManager(int container_id) {
   GetContainer(container_id)->SetLayoutManager(NULL);
 }
 
 void Shell::DisableWorkspaceGridLayout() {
   if (workspace_controller_.get())
     workspace_controller_->workspace_manager()->set_grid_size(0);
 }
 
 }  // namespace ash