Refactor views app list services to allow more code sharing

chrome/browser/ui/app_list/app_list_shower.cc

-// Copyright 2013 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 "base/bind.h"
-#include "base/message_loop/message_loop.h"
-#include "chrome/browser/ui/app_list/app_list_shower.h"
-#include "chrome/browser/ui/app_list/scoped_keep_alive.h"
-
-AppListShower::AppListShower(scoped_ptr<AppListFactory> factory,
-                             AppListService* service)
-    : factory_(factory.Pass()),
-      service_(service),
-      profile_(NULL),
-      can_close_app_list_(true) {
-}
-
-AppListShower::~AppListShower() {
-}
-
-void AppListShower::ShowForProfile(Profile* requested_profile) {
-  // If the app list is already displaying |profile| just activate it (in case
-  // we have lost focus).
-  if (IsAppListVisible() && (requested_profile == profile_)) {
-    app_list_->Show();
-    return;
-  }
-
-  if (!app_list_) {
-    CreateViewForProfile(requested_profile);
-  } else if (requested_profile != profile_) {
-    profile_ = requested_profile;
-    app_list_->SetProfile(requested_profile);
-  }
-
-  keep_alive_.reset(new ScopedKeepAlive);
-  if (!IsAppListVisible())
-    app_list_->MoveNearCursor();
-  app_list_->Show();
-}
-
-gfx::NativeWindow AppListShower::GetWindow() {
-  if (!IsAppListVisible())
-    return NULL;
-  return app_list_->GetWindow();
-}
-
-void AppListShower::CreateViewForProfile(Profile* requested_profile) {
-  profile_ = requested_profile;
-  app_list_.reset(factory_->CreateAppList(
-      profile_,
-      service_,
-      base::Bind(&AppListShower::DismissAppList, base::Unretained(this))));
-}
-
-void AppListShower::DismissAppList() {
-  if (app_list_ && can_close_app_list_) {
-    app_list_->Hide();
-    keep_alive_.reset();
-  }
-}
-
-void AppListShower::HandleViewBeingDestroyed() {
-  app_list_.reset();
-  profile_ = NULL;
-  can_close_app_list_ = true;
-
-  // We may end up here as the result of the OS deleting the AppList's
-  // widget (WidgetObserver::OnWidgetDestroyed). If this happens and there
-  // are no browsers around then deleting the keep alive will result in
-  // deleting the Widget again (by way of CloseAllSecondaryWidgets). When
-  // the stack unravels we end up back in the Widget that was deleted and
-  // crash. By delaying deletion of the keep alive we ensure the Widget has
-  // correctly been destroyed before ending the keep alive so that
-  // CloseAllSecondaryWidgets() won't attempt to delete the AppList's Widget
-  // again.
-  if (base::MessageLoop::current()) {  // NULL in tests.
-    base::MessageLoop::current()->PostTask(
-        FROM_HERE,
-        base::Bind(&AppListShower::ResetKeepAlive, base::Unretained(this)));
-    return;
-  }
-  keep_alive_.reset();
-}
-
-bool AppListShower::IsAppListVisible() const {
-  return app_list_ && app_list_->IsVisible();
-}
-
-void AppListShower::WarmupForProfile(Profile* profile) {
-  DCHECK(!profile_);
-  CreateViewForProfile(profile);
-  app_list_->Prerender();
-}
-
-bool AppListShower::HasView() const {
-  return !!app_list_;
-}
-
-void AppListShower::ResetKeepAlive() {
-  keep_alive_.reset();
-}