Add a printing resource (as a new style resource) to fetch the default print settings

ppapi/proxy/printing_resource.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 "ppapi/proxy/printing_resource.h"
+
+#include "ipc/ipc_message.h"
+#include "ppapi/c/pp_errors.h"
+#include "ppapi/proxy/dispatch_reply_message.h"
+#include "ppapi/proxy/ppapi_messages.h"
+
+namespace ppapi {
+namespace proxy {
+
+PrintingResource::PrintingResource(Connection connection,
+                                   PP_Instance instance)
+    : PluginResource(connection, instance),
+      print_settings_(NULL) {
+}
+
+PrintingResource::~PrintingResource() {
+}
+
+thunk::PPB_Printing_API* PrintingResource::AsPPB_Printing_API() {
+  return this;
+}
+
+int32_t PrintingResource::GetDefaultPrintSettings(
+    PP_PrintSettings_Dev* print_settings,
+    scoped_refptr<TrackedCallback> callback) {
+  if (!print_settings)
+    return PP_ERROR_BADARGUMENT;
+
+  if (TrackedCallback::IsPending(callback_))
+    return PP_ERROR_INPROGRESS;
+
+  if (!sent_create_to_renderer())
+    SendCreateToBrowser(PpapiHostMsg_Printing_Create());
+
+  DCHECK(!print_settings_);
+  print_settings_ = print_settings;
+  callback_ = callback;
+
+  CallBrowser(PpapiHostMsg_Printing_GetDefaultPrintSettings());
+  return PP_OK_COMPLETIONPENDING;
+}
+
+void PrintingResource::OnReplyReceived(
+    const ResourceMessageReplyParams& params,
+    const IPC::Message& msg) {
+  IPC_BEGIN_MESSAGE_MAP(PrintingResource, msg)
+    PPAPI_DISPATCH_RESOURCE_REPLY(
+        PpapiPluginMsg_Printing_GetDefaultPrintSettingsReply,
+        OnPluginMsgGetDefaultPrintSettingsReply)
+  IPC_END_MESSAGE_MAP()
+}
+
+void PrintingResource::OnPluginMsgGetDefaultPrintSettingsReply(
+    const ResourceMessageReplyParams& params,
+    const PP_PrintSettings_Dev& settings) {
+  if (params.result() == PP_OK)
+    *print_settings_ = settings;
+  print_settings_ = NULL;
+
+  // Notify the plugin of the new data.
+  TrackedCallback::ClearAndRun(&callback_, params.result());
+  // DANGER: May delete |this|!
+}
+
+}  // namespace proxy
+}  // namespace ppapi