[Offline pages] Create offline internals page for Android

chrome/browser/ui/webui/offline_internals_ui.cc

+// Copyright 2016 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 "chrome/browser/ui/webui/offline_internals_ui.h"
+
+#include <string>
+
+#include "base/bind.h"
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "base/values.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/common/url_constants.h"
+#include "content/public/browser/web_ui.h"
+#include "content/public/browser/web_ui_controller.h"
+#include "content/public/browser/web_ui_data_source.h"
+#include "content/public/browser/web_ui_message_handler.h"
+#include "grit/browser_resources.h"
+
+namespace {
+
+// Class acting as a controller of the chrome://offline-internals WebUI.
+class OfflineInternalsUIMessageHandler : public content::WebUIMessageHandler {
+ public:
+  OfflineInternalsUIMessageHandler();
+  ~OfflineInternalsUIMessageHandler() override;
+
+  // WebUIMessageHandler implementation.
+  void RegisterMessages() override;
+
+ private:
+  // Deletes all the pages in the store.
+  void DeleteAllPages(const base::ListValue* args);

[Dan Beam, 2016/06/03 23:27:25]

nit: most message handlers are named like:

HandleMessageNameFromPage

where chrome.send("messageNameFromPage")

[chili, 2016/06/06 18:11:58]

Done.

+
+  // Delete selected list of page ids from the store.
+  void DeleteSelectedPages(const base::ListValue* args);
+
+  // Load all information.
+  void GetOfflineInternalsInfo(const base::ListValue* args);
+
+  // Factory for creating references in callbacks.
+  base::WeakPtrFactory<OfflineInternalsUIMessageHandler> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(OfflineInternalsUIMessageHandler);
+};
+
+OfflineInternalsUIMessageHandler::OfflineInternalsUIMessageHandler()
+    : weak_ptr_factory_(this) {}
+
+OfflineInternalsUIMessageHandler::~OfflineInternalsUIMessageHandler() {}
+
+void OfflineInternalsUIMessageHandler::DeleteAllPages(
+    const base::ListValue* args) {
+  std::string callback_id;
+  args->GetString(0, &callback_id);
+  web_ui()->CallJavascriptFunction("cr.webUIResponse",

[Dan Beam, 2016/06/03 23:27:24]

it's better to

  CallJavascriptFunction()

rather than

  web_ui()->CallJavascriptFunction()

the latter is currently being renamed to CallJavascriptFunctionUnsafe() here:
https://codereview.chromium.org/1995113002/

[chili, 2016/06/06 18:11:58]

Done.

+      base::StringValue(callback_id),
+      base::FundamentalValue(true),
+      base::StringValue("success"));
+}
+
+void OfflineInternalsUIMessageHandler::DeleteSelectedPages(
+    const base::ListValue* args) {
+  std::string callback_id;
+  args->GetString(0, &callback_id);
+  web_ui()->CallJavascriptFunction("cr.webUIResponse",
+      base::StringValue(callback_id),
+      base::FundamentalValue(true),
+      base::StringValue("success"));
+}
+
+void OfflineInternalsUIMessageHandler::GetOfflineInternalsInfo(
+    const base::ListValue* args) {
+  std::string callback_id;
+  args->GetString(0, &callback_id);

[Dan Beam, 2016/06/03 23:27:25]

or you could just do:

base::Value* callback_id;
args->Get(0, &callback_id);

[chili, 2016/06/06 18:11:58]

Done.

+  base::DictionaryValue results;
+  results.Set("AllPages", new base::ListValue());
+  results.Set("Queue", new base::ListValue());
+

[Dan Beam, 2016/06/03 23:27:25]

sprinkle an

  AllowJavascript();

here

[chili, 2016/06/06 18:11:58]

Done.

+  web_ui()->CallJavascriptFunction("cr.webUIResponse",
+      base::StringValue(callback_id),
+      base::FundamentalValue(true),
+      results);
+}
+
+void OfflineInternalsUIMessageHandler::RegisterMessages() {
+  web_ui()->RegisterMessageCallback(
+      "deleteAllPages",
+      base::Bind(&OfflineInternalsUIMessageHandler::DeleteAllPages,
+                 weak_ptr_factory_.GetWeakPtr()));
+  web_ui()->RegisterMessageCallback(
+      "deleteSelectedPages",
+      base::Bind(&OfflineInternalsUIMessageHandler::DeleteSelectedPages,
+                 weak_ptr_factory_.GetWeakPtr()));
+  web_ui()->RegisterMessageCallback(
+      "getOfflineInternalsInfo",
+      base::Bind(&OfflineInternalsUIMessageHandler::GetOfflineInternalsInfo,
+                 weak_ptr_factory_.GetWeakPtr()));
+}
+
+}  // namespace
+
+OfflineInternalsUI::OfflineInternalsUI(content::WebUI* web_ui)
+    : content::WebUIController(web_ui) {
+  // chrome://offline-internals source.
+  content::WebUIDataSource* html_source =
+      content::WebUIDataSource::Create(chrome::kChromeUIOfflineInternalsHost);
+
+  // Required resources.
+  html_source->SetJsonPath("strings.js");
+  html_source->AddResourcePath("offline_internals.css",
+                               IDR_OFFLINE_INTERNALS_CSS);
+  html_source->AddResourcePath("offline_internals.js",
+                               IDR_OFFLINE_INTERNALS_JS);
+  html_source->SetDefaultResource(IDR_OFFLINE_INTERNALS_HTML);
+
+  content::WebUIDataSource::Add(Profile::FromWebUI(web_ui), html_source);
+
+  web_ui->AddMessageHandler(new OfflineInternalsUIMessageHandler());
+}
+
+OfflineInternalsUI::~OfflineInternalsUI() {}