Add Android's context menu handler used on the NTP.

chrome/browser/ui/webui/ntp/android/context_menu_handler.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 "chrome/browser/ui/webui/ntp/android/context_menu_handler.h"
+
+#include "base/bind.h"
+#include "base/string16.h"
+#include "base/utf_string_conversions.h"
+#include "base/values.h"
+#include "chrome/browser/android/tab_android.h"
+#include "chrome/browser/ui/webui/ntp/android/on_context_menu_item_selected_callback.h"
+#include "content/public/browser/user_metrics.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/common/context_menu_params.h"
+#include "content/public/common/page_transition_types.h"
+
+ContextMenuHandler::ContextMenuHandler() {
+}
+
+ContextMenuHandler::~ContextMenuHandler() {
+  ReleaseCallback();
+}
+
+void ContextMenuHandler::RegisterMessages() {
+  web_ui()->RegisterMessageCallback("showContextMenu",
+      base::Bind(&ContextMenuHandler::HandleShowContextMenu,
+                 base::Unretained(this)));
+  web_ui()->RegisterMessageCallback("openInNewTab",
+      base::Bind(&ContextMenuHandler::HandleOpenInNewTab,
+                 base::Unretained(this)));
+  web_ui()->RegisterMessageCallback("openInIncognitoTab",
+      base::Bind(&ContextMenuHandler::HandleOpenInIncognitoTab,
+                 base::Unretained(this)));
+}
+
+void ContextMenuHandler::OnItemSelected(int item_id) {
+  base::FundamentalValue value(item_id);
+  web_ui()->CallJavascriptFunction("ntp.onCustomMenuSelected", value);
+  // Callback has called us, we can release our reference so it gets deleted
+  // right away.
+  ReleaseCallback();
+}
+
+void ContextMenuHandler::HandleShowContextMenu(
+    const ListValue* menu_list_values) {
+  // If we have a pending callback, it is now obsolete.
+  ReleaseCallback();
+
+  if (menu_list_values->empty()) {
+    LOG(WARNING) << "Ignoring request for empty context menu.";
+    return;
+  }
+
+  // We expect menu_list_values to be of the form:
+  // [ [ 1, "title1" ], [ 2, "title2" ], ...]
+  // Where the first value in the sub-array is the item id and the second its
+  // title.
+  content::ContextMenuParams menu;
+  for (size_t i = 0; i < menu_list_values->GetSize(); ++i) {
+    ListValue* item_list_value = NULL;
+    bool valid_value = menu_list_values->GetList(
+        i, const_cast<const ListValue**>(&item_list_value));
+    if (!valid_value) {
+      LOG(ERROR) << "Invalid context menu request: menu item info " << i <<
+          " is not a list.";
+      return;
+    }
+
+    int id;
+    if (!ExtractIntegerValue(item_list_value, &id)) {
+      Value* value = NULL;
+      item_list_value->Get(0, &value);
+      LOG(ERROR) << "Invalid context menu request:  menu item " << i <<
+          " expected int value for first parameter (got " <<
+          value->GetType() << ").";
+      return;
+    }
+
+    WebMenuItem menu_item;
+    menu_item.action = id;
+    if (!item_list_value->GetString(1, &(menu_item.label))) {
+      Value* value = NULL;
+      item_list_value->Get(1, &value);
+      LOG(ERROR) << "Invalid context menu request:  menu item " << i <<
+          " expected string value for second parameter (got " <<
+          value->GetType() << ").";
+      return;
+    }
+    menu.custom_items.push_back(menu_item);
+  }
+
+  on_item_selected_callback_ = new OnContextMenuItemSelectedCallBack(this);
+
+  TabAndroid* tab = TabAndroid::FromWebContents(web_ui()->GetWebContents());
+  if (tab)
+    tab->ShowCustomContextMenu(menu, on_item_selected_callback_.get());
+}
+
+void ContextMenuHandler::HandleOpenInNewTab(const ListValue* args) {
+  string16 url = ExtractStringValue(args);
+  if (!url.empty()) {
+    web_ui()->GetWebContents()->OpenURL(content::OpenURLParams(
+        GURL(url), content::Referrer(), NEW_FOREGROUND_TAB,
+        content::PAGE_TRANSITION_AUTO_BOOKMARK, false));
+  }
+}
+
+void ContextMenuHandler::HandleOpenInIncognitoTab(const ListValue* args) {
+  string16 url = ExtractStringValue(args);
+  if (!url.empty()) {
+    web_ui()->GetWebContents()->OpenURL(content::OpenURLParams(
+        GURL(url), content::Referrer(), OFF_THE_RECORD,
+        content::PAGE_TRANSITION_AUTO_BOOKMARK, false));
+  }
+}
+
+void ContextMenuHandler::SetOnItemSelectedCallback(
+    OnContextMenuItemSelectedCallBack* callback) {
+  DCHECK(!on_item_selected_callback_.get());
+  on_item_selected_callback_ = callback;
+}
+
+void ContextMenuHandler::ReleaseCallback() {
+  if (on_item_selected_callback_.get()) {
+    on_item_selected_callback_->ClearContextMenuHandler();
+    on_item_selected_callback_ = NULL;
+  }
+}