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// 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.
#ifndef CHROME_BROWSER_PRINTING_PRINT_VIEW_MANAGER_BASE_H_
#define CHROME_BROWSER_PRINTING_PRINT_VIEW_MANAGER_BASE_H_
#include "base/memory/ref_counted.h"
#include "base/prefs/pref_member.h"
#include "base/strings/string16.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
#include "content/public/browser/web_contents_observer.h"
#include "content/public/browser/web_contents_user_data.h"
#include "printing/printed_pages_source.h"
struct PrintHostMsg_DidPrintPage_Params;
namespace content {
class RenderViewHost;
}
namespace printing {
class JobEventDetails;
class MetafilePlayer;
class PrintJob;
class PrintJobWorkerOwner;
class PrintQueriesQueue;
// Base class for managing the print commands for a WebContents.
class PrintViewManagerBase : public content::NotificationObserver,
public PrintedPagesSource,
public content::WebContentsObserver {
public:
~PrintViewManagerBase() override;
#if defined(ENABLE_BASIC_PRINTING)
// Prints the current document immediately. Since the rendering is
// asynchronous, the actual printing will not be completed on the return of
// this function. Returns false if printing is impossible at the moment.
virtual bool PrintNow();
#endif // ENABLE_BASIC_PRINTING
// Whether to block scripted printing for our tab or not.
void UpdateScriptedPrintingBlocked();
// PrintedPagesSource implementation.
base::string16 RenderSourceName() override;
protected:
explicit PrintViewManagerBase(content::WebContents* web_contents);
// Helper method for Print*Now().
bool PrintNowInternal(IPC::Message* message);
// Terminates or cancels the print job if one was pending.
void RenderProcessGone(base::TerminationStatus status) override;
// content::WebContentsObserver implementation.
bool OnMessageReceived(const IPC::Message& message) override;
// IPC Message handlers.
virtual void OnPrintingFailed(int cookie);
private:
// content::NotificationObserver implementation.
void Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) override;
// content::WebContentsObserver implementation.
void DidStartLoading(content::RenderViewHost* render_view_host) override;
// Cancels the print job.
void NavigationStopped() override;
// IPC Message handlers.
void OnDidGetPrintedPagesCount(int cookie, int number_pages);
void OnDidGetDocumentCookie(int cookie);
void OnDidPrintPage(const PrintHostMsg_DidPrintPage_Params& params);
void OnShowInvalidPrinterSettingsError();
// Processes a NOTIFY_PRINT_JOB_EVENT notification.
void OnNotifyPrintJobEvent(const JobEventDetails& event_details);
// Requests the RenderView to render all the missing pages for the print job.
// No-op if no print job is pending. Returns true if at least one page has
// been requested to the renderer.
bool RenderAllMissingPagesNow();
// Quits the current message loop if these conditions hold true: a document is
// loaded and is complete and waiting_for_pages_to_be_rendered_ is true. This
// function is called in DidPrintPage() or on ALL_PAGES_REQUESTED
// notification. The inner message loop is created was created by
// RenderAllMissingPagesNow().
void ShouldQuitFromInnerMessageLoop();
// Creates a new empty print job. It has no settings loaded. If there is
// currently a print job, safely disconnect from it. Returns false if it is
// impossible to safely disconnect from the current print job or it is
// impossible to create a new print job.
bool CreateNewPrintJob(PrintJobWorkerOwner* job);
// Makes sure the current print_job_ has all its data before continuing, and
// disconnect from it.
void DisconnectFromCurrentPrintJob();
// Notify that the printing is done.
void PrintingDone(bool success);
// Terminates the print job. No-op if no print job has been created. If
// |cancel| is true, cancel it instead of waiting for the job to finish. Will
// call ReleasePrintJob().
void TerminatePrintJob(bool cancel);
// Releases print_job_. Correctly deregisters from notifications. No-op if
// no print job has been created.
void ReleasePrintJob();
// Runs an inner message loop. It will set inside_inner_message_loop_ to true
// while the blocking inner message loop is running. This is useful in cases
// where the RenderView is about to be destroyed while a printing job isn't
// finished.
bool RunInnerMessageLoop();
// In the case of Scripted Printing, where the renderer is controlling the
// control flow, print_job_ is initialized whenever possible. No-op is
// print_job_ is initialized.
bool OpportunisticallyCreatePrintJob(int cookie);
// Release the PrinterQuery associated with our |cookie_|.
void ReleasePrinterQuery();
content::NotificationRegistrar registrar_;
// Manages the low-level talk to the printer.
scoped_refptr<PrintJob> print_job_;
// Number of pages to print in the print job.
int number_pages_;
// Indication of success of the print job.
bool printing_succeeded_;
// Running an inner message loop inside RenderAllMissingPagesNow(). This means
// we are _blocking_ until all the necessary pages have been rendered or the
// print settings are being loaded.
bool inside_inner_message_loop_;
#if !defined(OS_MACOSX)
// Set to true when OnDidPrintPage() should be expecting the first page.
bool expecting_first_page_;
#endif // OS_MACOSX
// The document cookie of the current PrinterQuery.
int cookie_;
// Whether printing is enabled.
BooleanPrefMember printing_enabled_;
scoped_refptr<printing::PrintQueriesQueue> queue_;
DISALLOW_COPY_AND_ASSIGN(PrintViewManagerBase);
};
} // namespace printing
#endif // CHROME_BROWSER_PRINTING_PRINT_VIEW_MANAGER_BASE_H_
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