components/printing/browser/print_manager.cc

// Copyright 2015 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 "components/printing/browser/print_manager.h"

#include "build/build_config.h"
#include "components/printing/common/print_messages.h"
#include "content/public/browser/render_frame_host.h"

namespace printing {

struct PrintManager::FrameDispatchHelper {
  PrintManager* manager;
  content::RenderFrameHost* render_frame_host;

  bool Send(IPC::Message* msg) { return render_frame_host->Send(msg); }

  void OnGetDefaultPrintSettings(IPC::Message* reply_msg) {
    manager->OnGetDefaultPrintSettings(render_frame_host, reply_msg);
  }

  void OnScriptedPrint(const PrintHostMsg_ScriptedPrint_Params& scripted_params,
                       IPC::Message* reply_msg) {
    manager->OnScriptedPrint(render_frame_host, scripted_params, reply_msg);
  }

  void OnDidPrintDocument(const PrintHostMsg_DidPrintDocument_Params& params,
                          IPC::Message* reply_msg) {
    // If DidPrintDocument message was received then need to transition from
    // a variable allocated on stack (which has efficient memory management
    // when dealing with any other incoming message) to a persistent variable
    // on the heap that can be referenced by the asynchronous processing which
    // occurs beyond the scope of PrintViewManagerBase::OnMessageReceived().
    manager->OnDidPrintDocument(render_frame_host, params,
                                std::make_unique<DelayedFrameDispatchHelper>(
                                    render_frame_host, reply_msg));
  }
};

PrintManager::DelayedFrameDispatchHelper::DelayedFrameDispatchHelper(
    content::RenderFrameHost* render_frame_host,
    IPC::Message* reply_msg)
    : render_frame_host_(render_frame_host), reply_msg_(reply_msg) {}

PrintManager::DelayedFrameDispatchHelper::~DelayedFrameDispatchHelper() {
  if (reply_msg_) {
    PrintHostMsg_DidPrintDocument::WriteReplyParams(reply_msg_, false);
    render_frame_host_->Send(reply_msg_);
  }
}

void PrintManager::DelayedFrameDispatchHelper::SendCompleted() {
  DCHECK(reply_msg_);

  PrintHostMsg_DidPrintDocument::WriteReplyParams(reply_msg_, true);
  render_frame_host_->Send(reply_msg_);

  // This wraps up the one allowed reply for the message.
  reply_msg_ = nullptr;
}

PrintManager::PrintManager(content::WebContents* contents)
    : content::WebContentsObserver(contents) {}

PrintManager::~PrintManager() = default;

bool PrintManager::OnMessageReceived(
    const IPC::Message& message,
    content::RenderFrameHost* render_frame_host) {
  FrameDispatchHelper helper = {this, render_frame_host};
  bool handled = true;
  IPC_BEGIN_MESSAGE_MAP(PrintManager, message)
    IPC_MESSAGE_HANDLER(PrintHostMsg_DidGetPrintedPagesCount,
                        OnDidGetPrintedPagesCount)
    IPC_MESSAGE_HANDLER(PrintHostMsg_DidGetDocumentCookie,
                        OnDidGetDocumentCookie)
    IPC_MESSAGE_FORWARD_DELAY_REPLY(
        PrintHostMsg_GetDefaultPrintSettings, &helper,
        FrameDispatchHelper::OnGetDefaultPrintSettings)
    IPC_MESSAGE_FORWARD_DELAY_REPLY(PrintHostMsg_ScriptedPrint, &helper,
                                    FrameDispatchHelper::OnScriptedPrint)
    IPC_MESSAGE_FORWARD_DELAY_REPLY(PrintHostMsg_DidPrintDocument, &helper,
                                    FrameDispatchHelper::OnDidPrintDocument);

    IPC_MESSAGE_HANDLER(PrintHostMsg_PrintingFailed, OnPrintingFailed)
    IPC_MESSAGE_UNHANDLED(handled = false)
  IPC_END_MESSAGE_MAP()
  return handled;
}

void PrintManager::OnDidGetPrintedPagesCount(int cookie,
                                             int number_pages) {
  DCHECK_GT(cookie, 0);
  DCHECK_GT(number_pages, 0);
  number_pages_ = number_pages;
}

void PrintManager::OnDidGetDocumentCookie(int cookie) {
  cookie_ = cookie;
}

void PrintManager::OnPrintingFailed(int cookie) {
  if (cookie != cookie_) {
    NOTREACHED();
    return;
  }
#if defined(OS_ANDROID)
  PdfWritingDone(0);
#endif
}

void PrintManager::PrintingRenderFrameDeleted() {
#if defined(OS_ANDROID)
  PdfWritingDone(0);
#endif
}

}  // namespace printing