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// 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.
#pragma once
#include <vector>
#include "base/memory/scoped_ptr.h"
#include "base/shared_memory.h"
#include "base/time.h"
#include "content/public/renderer/render_view_observer.h"
#include "content/public/renderer/render_view_observer_tracker.h"
#include "printing/metafile.h"
#include "printing/metafile_impl.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebCanvas.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrameClient.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebNode.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebPrintParams.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebViewClient.h"
#include "ui/gfx/size.h"
struct PrintMsg_Print_Params;
struct PrintMsg_PrintPage_Params;
struct PrintMsg_PrintPages_Params;
namespace base {
class DictionaryValue;
namespace printing {
struct PageSizeMargins;
// Class that calls the Begin and End print functions on the frame and changes
// the size of the view temporarily to support full page printing..
// Do not serve any events in the time between construction and destruction of
// this class because it will cause flicker.
class PrepareFrameAndViewForPrint {
// Prints |frame|. If |node| is not NULL, then only that node will be
// printed.
PrepareFrameAndViewForPrint(const PrintMsg_Print_Params& print_params,
WebKit::WebFrame* frame,
const WebKit::WebNode& node);
void UpdatePrintParams(const PrintMsg_Print_Params& print_params);
int GetExpectedPageCount() const {
return expected_pages_count_;
bool ShouldUseBrowserOverlays() const {
return use_browser_overlays_;
gfx::Size GetPrintCanvasSize() const {
return gfx::Size(web_print_params_.printContentArea.width,
void FinishPrinting();
void StartPrinting(const WebKit::WebPrintParams& webkit_print_params);
WebKit::WebFrame* frame_;
WebKit::WebNode node_to_print_;
WebKit::WebView* web_view_;
WebKit::WebPrintParams web_print_params_;
gfx::Size prev_view_size_;
gfx::Size prev_scroll_offset_;
int expected_pages_count_;
bool use_browser_overlays_;
bool finished_;
// PrintWebViewHelper handles most of the printing grunt work for RenderView.
// We plan on making print asynchronous and that will require copying the DOM
// of the document and creating a new WebView with the contents.
class PrintWebViewHelper
: public content::RenderViewObserver,
public content::RenderViewObserverTracker<PrintWebViewHelper>,
public WebKit::WebViewClient,
public WebKit::WebFrameClient {
explicit PrintWebViewHelper(content::RenderView* render_view);
virtual ~PrintWebViewHelper();
void PrintNode(const WebKit::WebNode& node);
// WebKit::WebViewClient override:
virtual void didStopLoading();
friend class PrintWebViewHelperTestBase;
FRIEND_TEST_ALL_PREFIXES(PrintWebViewHelperTest, OnPrintPages);
#if defined(OS_WIN) || defined(OS_MACOSX)
FRIEND_TEST_ALL_PREFIXES(PrintWebViewHelperTest, PrintLayoutTest);
FRIEND_TEST_ALL_PREFIXES(PrintWebViewHelperTest, PrintWithIframe);
#endif // defined(OS_WIN) || defined(OS_MACOSX)
enum PrintingResult {
enum PrintPreviewErrorBuckets {
PREVIEW_ERROR_NONE, // Always first.
enum PrintPreviewRequestType {
PRINT_PREVIEW_SCRIPTED // triggered by window.print().
// RenderViewObserver implementation.
virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
virtual void PrintPage(WebKit::WebFrame* frame) OVERRIDE;
// Message handlers ---------------------------------------------------------
// Print the document.
void OnPrintPages();
// Print the document with the print preview frame/node.
void OnPrintForSystemDialog();
// Get |page_size| and |content_area| information from
// |page_layout_in_points|.
void GetPageSizeAndContentAreaFromPageLayout(
const printing::PageSizeMargins& page_layout_in_points,
gfx::Size* page_size,
gfx::Rect* content_area);
// Update |ignore_css_margins_| based on settings.
void UpdateFrameMarginsCssInfo(const base::DictionaryValue& settings);
// Returns true if the current destination printer is PRINT_TO_PDF.
bool IsPrintToPdfRequested(const base::DictionaryValue& settings);
// Returns the print scaling option to retain/scale/crop the source page size
// to fit the printable area of the paper.
// We retain the source page size when the current destination printer is
// We crop the source page size to fit the printable area or we print only the
// left top page contents when
// (1) Source is PDF and the user has requested not to fit to printable area
// via |job_settings|.
// (2) Source is PDF. This is the first preview request and print scaling
// option is disabled for initiator renderer plugin.
// In all other cases, we scale the source page to fit the printable area.
WebKit::WebPrintScalingOption GetPrintScalingOption(
bool source_is_html,
const base::DictionaryValue& job_settings,
const PrintMsg_Print_Params& params);
// Initiate print preview.
void OnInitiatePrintPreview();
// Start the process of generating a print preview using |settings|.
void OnPrintPreview(const base::DictionaryValue& settings);
// Initialize the print preview document.
bool CreatePreviewDocument();
// Renders a print preview page. |page_number| is 0-based.
// Returns true if print preview should continue, false on failure.
bool RenderPreviewPage(int page_number);
// Finalize the print ready preview document.
bool FinalizePrintReadyDocument();
// Print / preview the node under the context menu.
void OnPrintNodeUnderContextMenu();
// Print the pages for print preview. Do not display the native print dialog
// for user settings. |job_settings| has new print job settings values.
void OnPrintForPrintPreview(const base::DictionaryValue& job_settings);
void OnPrintingDone(bool success);
// Enable/Disable window.print calls. If |blocked| is true window.print
// calls will silently fail. Call with |blocked| set to false to reenable.
void SetScriptedPrintBlocked(bool blocked);
// Main printing code -------------------------------------------------------
void Print(WebKit::WebFrame* frame, const WebKit::WebNode& node);
// Notification when printing is done - signal tear-down/free resources.
void DidFinishPrinting(PrintingResult result);
// Print Settings -----------------------------------------------------------
// Initialize print page settings with default settings.
// Used only for native printing workflow.
bool InitPrintSettings(bool fit_to_paper_size);
// Initialize print page settings with default settings and prepare the frame
// for print. A new PrepareFrameAndViewForPrint is created to fulfill the
// request and is filled into the |prepare| argument.
// Used only for native printing workflow.
bool InitPrintSettingsAndPrepareFrame(
WebKit::WebFrame* frame,
const WebKit::WebNode& node,
scoped_ptr<PrepareFrameAndViewForPrint>* prepare);
// Update the current print settings with new |job_settings|. |job_settings|
// dictionary contains print job details such as printer name, number of
// copies, page range, etc.
bool UpdatePrintSettings(WebKit::WebFrame* frame,
const WebKit::WebNode& node,
const base::DictionaryValue& passed_job_settings);
// Get final print settings from the user.
// Return false if the user cancels or on error.
bool GetPrintSettingsFromUser(WebKit::WebFrame* frame,
const WebKit::WebNode& node,
int expected_pages_count,
bool use_browser_overlays);
// Page Printing / Rendering ------------------------------------------------
// Prints all the pages listed in |print_pages_params_|.
// It will implicitly revert the document to display CSS media type.
bool PrintPages(WebKit::WebFrame* frame, const WebKit::WebNode& node);
// Prints the page listed in |params|.
#if defined(USE_X11)
void PrintPageInternal(const PrintMsg_PrintPage_Params& params,
const gfx::Size& canvas_size,
WebKit::WebFrame* frame,
printing::Metafile* metafile);
void PrintPageInternal(const PrintMsg_PrintPage_Params& params,
const gfx::Size& canvas_size,
WebKit::WebFrame* frame);
// Render the frame for printing.
bool RenderPagesForPrint(WebKit::WebFrame* frame,
const WebKit::WebNode& node);
// Platform specific helper function for rendering page(s) to |metafile|.
#if defined(OS_WIN)
// Because of mixed support for alpha channels on printers, this method may
// need to create a new metafile. The result may be either the passed
// |metafile| or a new one. In either case, the caller owns both |metafile|
// and the result.
printing::Metafile* RenderPage(const PrintMsg_Print_Params& params,
int page_number,
WebKit::WebFrame* frame,
bool is_preview,
printing::Metafile* metafile,
double* scale_factor,
gfx::Size* page_size_in_dpi,
gfx::Rect* content_area_in_dpi);
#elif defined(OS_MACOSX)
void RenderPage(const PrintMsg_Print_Params& params, int page_number,
WebKit::WebFrame* frame, bool is_preview,
printing::Metafile* metafile, gfx::Size* page_size,
gfx::Rect* content_rect);
#elif defined(OS_POSIX)
bool RenderPages(const PrintMsg_PrintPages_Params& params,
WebKit::WebFrame* frame, const WebKit::WebNode& node,
int* page_count, PrepareFrameAndViewForPrint* prepare,
printing::Metafile* metafile);
#endif // defined(OS_WIN)
// Helper methods -----------------------------------------------------------
bool CopyAndPrint(WebKit::WebFrame* web_frame);
bool CopyMetafileDataToSharedMem(printing::Metafile* metafile,
base::SharedMemoryHandle* shared_mem_handle);
// Helper method to get page layout in points and fit to page if needed.
static void ComputePageLayoutInPointsForCss(
WebKit::WebFrame* frame,
int page_index,
const PrintMsg_Print_Params& default_params,
bool ignore_css_margins,
double* scale_factor,
printing::PageSizeMargins* page_layout_in_points);
// Prepare the frame and view for print and then call this function to honor
// the CSS page layout information.
static void UpdateFrameAndViewFromCssPageLayout(
WebKit::WebFrame* frame,
const WebKit::WebNode& node,
PrepareFrameAndViewForPrint* prepare,
const PrintMsg_Print_Params& params,
bool ignore_css_margins);
// Given the |device| and |canvas| to draw on, prints the appropriate headers
// and footers using strings from |header_footer_info| on to the canvas.
static void PrintHeaderAndFooter(
WebKit::WebCanvas* canvas,
int page_number,
int total_pages,
float webkit_scale_factor,
const printing::PageSizeMargins& page_layout_in_points,
const base::DictionaryValue& header_footer_info);
bool GetPrintFrame(WebKit::WebFrame** frame);
// This reports the current time - |start_time| as the time to render a page.
void ReportPreviewPageRenderTime(base::TimeTicks start_time);
// Script Initiated Printing ------------------------------------------------
// Return true if script initiated printing is currently allowed.
bool IsScriptInitiatedPrintAllowed(WebKit::WebFrame* frame);
// Returns true if script initiated printing occurs too often.
bool IsScriptInitiatedPrintTooFrequent(WebKit::WebFrame* frame);
// Reset the counter for script initiated printing.
// Scripted printing will be allowed to continue.
void ResetScriptedPrintCount();
// Increment the counter for script initiated printing.
// Scripted printing will be blocked for a limited amount of time.
void IncrementScriptedPrintCount();
// Displays the print job error message to the user.
void DisplayPrintJobError();
void RequestPrintPreview(PrintPreviewRequestType type);
// Checks whether print preview should continue or not.
// Returns true if cancelling, false if continuing.
bool CheckForCancel();
// Notifies the browser a print preview page has been rendered.
// |page_number| is 0-based.
// For a valid |page_number| with modifiable content,
// |metafile| is the rendered page. Otherwise |metafile| is NULL.
// Returns true if print preview should continue, false on failure.
bool PreviewPageRendered(int page_number, printing::Metafile* metafile);
// WebView used only to print the selection.
WebKit::WebView* print_web_view_;
scoped_ptr<PrintMsg_PrintPages_Params> print_pages_params_;
bool is_preview_enabled_;
bool is_print_ready_metafile_sent_;
bool ignore_css_margins_;
// Used for scripted initiated printing blocking.
base::Time last_cancelled_script_print_;
int user_cancelled_scripted_print_count_;
bool is_scripted_printing_blocked_;
// Let the browser process know of a printing failure. Only set to false when
// the failure came from the browser in the first place.
bool notify_browser_of_print_failure_;
// True, when printing from print preview.
bool print_for_preview_;
scoped_ptr<PrintMsg_PrintPages_Params> old_print_pages_params_;
// Strings generated by the browser process to be printed as headers and
// footers if requested by the user.
scoped_ptr<base::DictionaryValue> header_footer_info_;
// Keeps track of the state of print preview between messages.
class PrintPreviewContext {
// Initializes the print preview context. Need to be called to set
// the |web_frame| / |web_node| to generate the print preview for.
void InitWithFrame(WebKit::WebFrame* web_frame);
void InitWithNode(const WebKit::WebNode& web_node);
// Does bookkeeping at the beginning of print preview.
void OnPrintPreview();
// Create the print preview document. |pages| is empty to print all pages.
bool CreatePreviewDocument(PrintMsg_Print_Params* params,
const std::vector<int>& pages,
bool ignore_css_margins);
// Called after a page gets rendered. |page_time| is how long the
// rendering took.
void RenderedPreviewPage(const base::TimeDelta& page_time);
// Updates the print preview context when the required pages are rendered.
void AllPagesRendered();
// Finalizes the print ready preview document.
void FinalizePrintReadyDocument();
// Cleanup after print preview finishes.
void Finished();
// Cleanup after print preview fails.
void Failed(bool report_error);
// Helper functions
int GetNextPageNumber();
bool IsRendering() const;
bool IsModifiable() const;
bool IsLastPageOfPrintReadyMetafile() const;
bool IsFinalPageRendered() const;
// Setters
void set_generate_draft_pages(bool generate_draft_pages);
void set_error(enum PrintPreviewErrorBuckets error);
// Getters
WebKit::WebFrame* frame();
const WebKit::WebNode& node() const;
int total_page_count() const;
bool generate_draft_pages() const;
printing::PreviewMetafile* metafile();
const PrintMsg_Print_Params& print_params() const;
gfx::Size GetPrintCanvasSize() const;
int last_error() const;
enum State {
UNINITIALIZED, // Not ready to render.
INITIALIZED, // Ready to render.
RENDERING, // Rendering.
DONE // Finished rendering.
// Reset some of the internal rendering context.
void ClearContext();
// Specifies what to render for print preview.
WebKit::WebFrame* frame_;
WebKit::WebNode node_;
scoped_ptr<PrepareFrameAndViewForPrint> prep_frame_view_;
scoped_ptr<printing::PreviewMetafile> metafile_;
scoped_ptr<PrintMsg_Print_Params> print_params_;
// Total page count in the renderer.
int total_page_count_;
// The current page to render.
int current_page_index_;
// List of page indices that need to be rendered.
std::vector<int> pages_to_render_;
// True, when draft pages needs to be generated.
bool generate_draft_pages_;
// Specifies the total number of pages in the print ready metafile.
int print_ready_metafile_page_count_;
base::TimeDelta document_render_time_;
base::TimeTicks begin_time_;
enum PrintPreviewErrorBuckets error_;
State state_;
PrintPreviewContext print_preview_context_;