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// 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/desktop_background/desktop_background_controller.h"
#include "ash/desktop_background/desktop_background_view.h"
#include "ash/shell.h"
#include "ash/shell_factory.h"
#include "ash/shell_window_ids.h"
#include "ash/wm/root_window_layout_manager.h"
#include "base/bind.h"
#include "base/logging.h"
#include "base/synchronization/cancellation_flag.h"
#include "base/threading/worker_pool.h"
#include "grit/ui_resources.h"
#include "ui/aura/window.h"
#include "ui/base/resource/resource_bundle.h"
#include "ui/compositor/layer.h"
#include "ui/gfx/image/image.h"
#include "ui/views/widget/widget.h"
namespace ash {
// DesktopBackgroundController::WallpaperOperation wraps background wallpaper
// loading.
class DesktopBackgroundController::WallpaperOperation
: public base::RefCountedThreadSafe<
DesktopBackgroundController::WallpaperOperation> {
public:
WallpaperOperation(int index)
: wallpaper_(NULL),
layout_(CENTER_CROPPED),
index_(index) {
}
static void Run(scoped_refptr<WallpaperOperation> wo) {
wo->LoadingWallpaper();
}
void LoadingWallpaper() {
if (cancel_flag_.IsSet())
return;
wallpaper_ = ui::ResourceBundle::GetSharedInstance().GetImageNamed(
GetWallpaperInfo(index_).id).ToImageSkia();
if (cancel_flag_.IsSet())
return;
layout_ = GetWallpaperInfo(index_).layout;
}
void Cancel() {
cancel_flag_.Set();
}
const gfx::ImageSkia* wallpaper() {
return wallpaper_;
}
WallpaperLayout wallpaper_layout() {
return layout_;
}
int index() {
return index_;
}
private:
friend class base::RefCountedThreadSafe<
DesktopBackgroundController::WallpaperOperation>;
base::CancellationFlag cancel_flag_;
const gfx::ImageSkia* wallpaper_;
WallpaperLayout layout_;
int index_;
DISALLOW_COPY_AND_ASSIGN(WallpaperOperation);
};
DesktopBackgroundController::DesktopBackgroundController()
: desktop_background_mode_(BACKGROUND_IMAGE),
previous_index_(-1),
weak_ptr_factory_(ALLOW_THIS_IN_INITIALIZER_LIST(this)) {
}
DesktopBackgroundController::~DesktopBackgroundController() {
CancelPendingWallpaperOperation();
}
void DesktopBackgroundController::SetDefaultWallpaper(int index) {
if (previous_index_ == index)
return;
CancelPendingWallpaperOperation();
wallpaper_op_ = new WallpaperOperation(index);
base::WorkerPool::PostTaskAndReply(
FROM_HERE,
base::Bind(&WallpaperOperation::Run, wallpaper_op_),
base::Bind(&DesktopBackgroundController::OnWallpaperLoadCompleted,
weak_ptr_factory_.GetWeakPtr(),
wallpaper_op_),
true /* task_is_slow */);
}
void DesktopBackgroundController::SetCustomWallpaper(
const gfx::ImageSkia& wallpaper,
WallpaperLayout layout) {
internal::RootWindowLayoutManager* root_window_layout =
Shell::GetInstance()->root_window_layout();
root_window_layout->SetBackgroundLayer(NULL);
internal::CreateDesktopBackground(wallpaper, layout);
desktop_background_mode_ = BACKGROUND_IMAGE;
}
void DesktopBackgroundController::CancelPendingWallpaperOperation() {
// Set canceled flag of previous request to skip unneeded loading.
if (wallpaper_op_.get())
wallpaper_op_->Cancel();
// Cancel reply callback for previous request.
weak_ptr_factory_.InvalidateWeakPtrs();
}
void DesktopBackgroundController::SetLoggedInUserWallpaper() {
int index = Shell::GetInstance()->user_wallpaper_delegate()->
GetUserWallpaperIndex();
// We should not change background when index is invalid. For instance, at
// login screen or stub_user login.
if (index == ash::GetInvalidWallpaperIndex()) {
CreateEmptyWallpaper();
return;
}
SetDefaultWallpaper(index);
}
void DesktopBackgroundController::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
Shell* shell = Shell::GetInstance();
ui::Layer* background_layer = new ui::Layer(ui::LAYER_SOLID_COLOR);
background_layer->SetColor(SK_ColorBLACK);
shell->GetContainer(internal::kShellWindowId_DesktopBackgroundContainer)->
layer()->Add(background_layer);
shell->root_window_layout()->SetBackgroundLayer(background_layer);
shell->root_window_layout()->SetBackgroundWidget(NULL);
desktop_background_mode_ = BACKGROUND_SOLID_COLOR;
}
void DesktopBackgroundController::SetDesktopBackgroundImageMode(
scoped_refptr<WallpaperOperation> wo) {
internal::RootWindowLayoutManager* root_window_layout =
Shell::GetInstance()->root_window_layout();
root_window_layout->SetBackgroundLayer(NULL);
if(wo->wallpaper()) {
internal::CreateDesktopBackground(*wo->wallpaper(), wo->wallpaper_layout());
desktop_background_mode_ = BACKGROUND_IMAGE;
}
}
void DesktopBackgroundController::OnWallpaperLoadCompleted(
scoped_refptr<WallpaperOperation> wo) {
SetDesktopBackgroundImageMode(wo);
previous_index_ = wo->index();
DCHECK(wo.get() == wallpaper_op_.get());
wallpaper_op_ = NULL;
}
void DesktopBackgroundController::CreateEmptyWallpaper() {
gfx::ImageSkia dummy;
internal::CreateDesktopBackground(dummy, CENTER);
desktop_background_mode_ = BACKGROUND_IMAGE;
}
} // namespace ash
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