Revert of 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();
+}