chrome/renderer/printing/print_web_view_helper.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROME_RENDERER_PRINTING_PRINT_WEB_VIEW_HELPER_H_
   6 #define CHROME_RENDERER_PRINTING_PRINT_WEB_VIEW_HELPER_H_
   7
   8 #include <vector>
   9
  10 #include "base/callback.h"
  11 #include "base/gtest_prod_util.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "base/memory/shared_memory.h"
  14 #include "base/memory/weak_ptr.h"
  15 #include "base/time/time.h"
  16 #include "content/public/renderer/render_view_observer.h"
  17 #include "content/public/renderer/render_view_observer_tracker.h"
  18 #include "printing/pdf_metafile_skia.h"
  19 #include "third_party/WebKit/public/platform/WebCanvas.h"
  20 #include "third_party/WebKit/public/web/WebNode.h"
  21 #include "third_party/WebKit/public/web/WebPrintParams.h"
  22 #include "ui/gfx/size.h"
  23
  24 struct PrintMsg_Print_Params;
  25 struct PrintMsg_PrintPage_Params;
  26 struct PrintMsg_PrintPages_Params;
  27 struct PrintHostMsg_SetOptionsFromDocument_Params;
  28
  29 namespace base {
  30 class DictionaryValue;
  31 }
  32
  33 namespace blink {
  34 class WebFrame;
  35 class WebView;
  36 }
  37
  38 namespace printing {
  39
  40 struct PageSizeMargins;
  41 class PrepareFrameAndViewForPrint;
  42
  43 // Stores reference to frame using WebVew and unique name.
  44 // Workaround to modal dialog issue on Linux. crbug.com/236147.
  45 // If WebFrame someday supports WeakPtr, we should use it here.
  46 class FrameReference {
  47  public:
  48   explicit FrameReference(blink::WebLocalFrame* frame);
  49   FrameReference();
  50   ~FrameReference();
  51
  52   void Reset(blink::WebLocalFrame* frame);
  53
  54   blink::WebLocalFrame* GetFrame();
  55   blink::WebView* view();
  56
  57  private:
  58   blink::WebView* view_;
  59   blink::WebLocalFrame* frame_;
  60 };
  61
  62 // PrintWebViewHelper handles most of the printing grunt work for RenderView.
  63 // We plan on making print asynchronous and that will require copying the DOM
  64 // of the document and creating a new WebView with the contents.
  65 class PrintWebViewHelper
  66     : public content::RenderViewObserver,
  67       public content::RenderViewObserverTracker<PrintWebViewHelper> {
  68  public:
  69   explicit PrintWebViewHelper(content::RenderView* render_view);
  70   ~PrintWebViewHelper() override;
  71
  72   // Disable print preview and switch to system dialog printing even if full
  73   // printing is build-in. This method is used by CEF.
  74   static void DisablePreview();
  75
  76   bool IsPrintingEnabled();
  77
  78   void PrintNode(const blink::WebNode& node);
  79
  80  private:
  81   friend class PrintWebViewHelperTestBase;
  82   FRIEND_TEST_ALL_PREFIXES(PrintWebViewHelperPreviewTest,
  83                            BlockScriptInitiatedPrinting);
  84   FRIEND_TEST_ALL_PREFIXES(PrintWebViewHelperTest, OnPrintPages);
  85   FRIEND_TEST_ALL_PREFIXES(PrintWebViewHelperTest,
  86                            BlockScriptInitiatedPrinting);
  87   FRIEND_TEST_ALL_PREFIXES(PrintWebViewHelperTest,
  88                            BlockScriptInitiatedPrintingFromPopup);
  89 #if defined(OS_WIN) || defined(OS_MACOSX)
  90   FRIEND_TEST_ALL_PREFIXES(PrintWebViewHelperTest, PrintLayoutTest);
  91   FRIEND_TEST_ALL_PREFIXES(PrintWebViewHelperTest, PrintWithIframe);
  92 #endif  // defined(OS_WIN) || defined(OS_MACOSX)
  93
  94   enum PrintingResult {
  95     OK,
  96     FAIL_PRINT_INIT,
  97     FAIL_PRINT,
  98     FAIL_PREVIEW,
  99   };
 100
 101   enum PrintPreviewErrorBuckets {
 102     PREVIEW_ERROR_NONE,  // Always first.
 103     PREVIEW_ERROR_BAD_SETTING,
 104     PREVIEW_ERROR_METAFILE_COPY_FAILED,
 105     PREVIEW_ERROR_METAFILE_INIT_FAILED,
 106     PREVIEW_ERROR_ZERO_PAGES,
 107     PREVIEW_ERROR_MAC_DRAFT_METAFILE_INIT_FAILED,
 108     PREVIEW_ERROR_PAGE_RENDERED_WITHOUT_METAFILE,
 109     PREVIEW_ERROR_INVALID_PRINTER_SETTINGS,
 110     PREVIEW_ERROR_LAST_ENUM  // Always last.
 111   };
 112
 113   enum PrintPreviewRequestType {
 114     PRINT_PREVIEW_USER_INITIATED_ENTIRE_FRAME,
 115     PRINT_PREVIEW_USER_INITIATED_SELECTION,
 116     PRINT_PREVIEW_USER_INITIATED_CONTEXT_NODE,
 117     PRINT_PREVIEW_SCRIPTED  // triggered by window.print().
 118   };
 119
 120   // RenderViewObserver implementation.
 121   bool OnMessageReceived(const IPC::Message& message) override;
 122   void PrintPage(blink::WebLocalFrame* frame, bool user_initiated) override;
 123   void DidStartLoading() override;
 124   void DidStopLoading() override;
 125
 126   // Message handlers ---------------------------------------------------------
 127 #if defined(ENABLE_BASIC_PRINTING)
 128   void OnPrintPages();
 129   void OnPrintForSystemDialog();
 130 #endif  // ENABLE_BASIC_PRINTING
 131   void OnInitiatePrintPreview(bool selection_only);
 132   void OnPrintPreview(const base::DictionaryValue& settings);
 133   void OnPrintForPrintPreview(const base::DictionaryValue& job_settings);
 134   void OnPrintingDone(bool success);
 135
 136   // Get |page_size| and |content_area| information from
 137   // |page_layout_in_points|.
 138   void GetPageSizeAndContentAreaFromPageLayout(
 139       const PageSizeMargins& page_layout_in_points,
 140       gfx::Size* page_size,
 141       gfx::Rect* content_area);
 142
 143   // Update |ignore_css_margins_| based on settings.
 144   void UpdateFrameMarginsCssInfo(const base::DictionaryValue& settings);
 145
 146   // Returns true if the current destination printer is PRINT_TO_PDF.
 147   bool IsPrintToPdfRequested(const base::DictionaryValue& settings);
 148
 149   // Prepare frame for creating preview document.
 150   void PrepareFrameForPreviewDocument();
 151
 152   // Continue creating preview document.
 153   void OnFramePreparedForPreviewDocument();
 154
 155   // Initialize the print preview document.
 156   bool CreatePreviewDocument();
 157
 158   // Renders a print preview page. |page_number| is 0-based.
 159   // Returns true if print preview should continue, false on failure.
 160   bool RenderPreviewPage(int page_number,
 161                          const PrintMsg_Print_Params& print_params);
 162
 163   // Finalize the print ready preview document.
 164   bool FinalizePrintReadyDocument();
 165
 166   // Enable/Disable window.print calls.  If |blocked| is true window.print
 167   // calls will silently fail.  Call with |blocked| set to false to reenable.
 168   void SetScriptedPrintBlocked(bool blocked);
 169
 170   // Main printing code -------------------------------------------------------
 171
 172   // |is_scripted| should be true when the call is coming from window.print()
 173   void Print(blink::WebLocalFrame* frame,
 174              const blink::WebNode& node,
 175              bool is_scripted);
 176
 177   // Notification when printing is done - signal tear-down/free resources.
 178   void DidFinishPrinting(PrintingResult result);
 179
 180   // Print Settings -----------------------------------------------------------
 181
 182   // Initialize print page settings with default settings.
 183   // Used only for native printing workflow.
 184   bool InitPrintSettings(bool fit_to_paper_size);
 185
 186   // Calculate number of pages in source document.
 187   bool CalculateNumberOfPages(blink::WebLocalFrame* frame,
 188                               const blink::WebNode& node,
 189                               int* number_of_pages);
 190
 191   // Set options for print preset from source PDF document.
 192   void SetOptionsFromDocument(
 193       PrintHostMsg_SetOptionsFromDocument_Params& params);
 194
 195   // Update the current print settings with new |passed_job_settings|.
 196   // |passed_job_settings| dictionary contains print job details such as printer
 197   // name, number of copies, page range, etc.
 198   bool UpdatePrintSettings(blink::WebLocalFrame* frame,
 199                            const blink::WebNode& node,
 200                            const base::DictionaryValue& passed_job_settings);
 201
 202   // Get final print settings from the user.
 203   // Return false if the user cancels or on error.
 204   bool GetPrintSettingsFromUser(blink::WebFrame* frame,
 205                                 const blink::WebNode& node,
 206                                 int expected_pages_count,
 207                                 bool is_scripted);
 208
 209   // Page Printing / Rendering ------------------------------------------------
 210
 211   void OnFramePreparedForPrintPages();
 212   void PrintPages();
 213   bool PrintPagesNative(blink::WebFrame* frame, int page_count);
 214   void FinishFramePrinting();
 215
 216   // Prints the page listed in |params|.
 217 #if defined(OS_LINUX) || defined(OS_ANDROID)
 218   void PrintPageInternal(const PrintMsg_PrintPage_Params& params,
 219                          blink::WebFrame* frame,
 220                          PdfMetafileSkia* metafile);
 221 #elif defined(OS_WIN)
 222   void PrintPageInternal(const PrintMsg_PrintPage_Params& params,
 223                          blink::WebFrame* frame,
 224                          PdfMetafileSkia* metafile,
 225                          gfx::Size* page_size_in_dpi,
 226                          gfx::Rect* content_area_in_dpi);
 227 #else
 228   void PrintPageInternal(const PrintMsg_PrintPage_Params& params,
 229                          blink::WebFrame* frame);
 230 #endif
 231
 232   // Render the frame for printing.
 233   bool RenderPagesForPrint(blink::WebLocalFrame* frame,
 234                            const blink::WebNode& node);
 235
 236   // Platform specific helper function for rendering page(s) to |metafile|.
 237 #if defined(OS_MACOSX)
 238   void RenderPage(const PrintMsg_Print_Params& params,
 239                   int page_number,
 240                   blink::WebFrame* frame,
 241                   bool is_preview,
 242                   PdfMetafileSkia* metafile,
 243                   gfx::Size* page_size,
 244                   gfx::Rect* content_rect);
 245 #endif  // defined(OS_MACOSX)
 246
 247   // Renders page contents from |frame| to |content_area| of |canvas|.
 248   // |page_number| is zero-based.
 249   // When method is called, canvas should be setup to draw to |canvas_area|
 250   // with |scale_factor|.
 251   static float RenderPageContent(blink::WebFrame* frame,
 252                                  int page_number,
 253                                  const gfx::Rect& canvas_area,
 254                                  const gfx::Rect& content_area,
 255                                  double scale_factor,
 256                                  blink::WebCanvas* canvas);
 257
 258   // Helper methods -----------------------------------------------------------
 259
 260   bool CopyMetafileDataToSharedMem(PdfMetafileSkia* metafile,
 261                                    base::SharedMemoryHandle* shared_mem_handle);
 262
 263   // Helper method to get page layout in points and fit to page if needed.
 264   static void ComputePageLayoutInPointsForCss(
 265       blink::WebFrame* frame,
 266       int page_index,
 267       const PrintMsg_Print_Params& default_params,
 268       bool ignore_css_margins,
 269       double* scale_factor,
 270       PageSizeMargins* page_layout_in_points);
 271
 272 #if defined(ENABLE_PRINT_PREVIEW)
 273   // Given the |device| and |canvas| to draw on, prints the appropriate headers
 274   // and footers using strings from |header_footer_info| on to the canvas.
 275   static void PrintHeaderAndFooter(blink::WebCanvas* canvas,
 276                                    int page_number,
 277                                    int total_pages,
 278                                    const blink::WebFrame& source_frame,
 279                                    float webkit_scale_factor,
 280                                    const PageSizeMargins& page_layout_in_points,
 281                                    const PrintMsg_Print_Params& params);
 282 #endif  // defined(ENABLE_PRINT_PREVIEW)
 283
 284   bool GetPrintFrame(blink::WebLocalFrame** frame);
 285
 286   // Script Initiated Printing ------------------------------------------------
 287
 288   // Return true if script initiated printing is currently
 289   // allowed. |user_initiated| should be true when a user event triggered the
 290   // script, most likely by pressing a print button on the page.
 291   bool IsScriptInitiatedPrintAllowed(blink::WebFrame* frame,
 292                                      bool user_initiated);
 293
 294   // Shows scripted print preview when options from plugin are available.
 295   void ShowScriptedPrintPreview();
 296
 297   void RequestPrintPreview(PrintPreviewRequestType type);
 298
 299   // Checks whether print preview should continue or not.
 300   // Returns true if canceling, false if continuing.
 301   bool CheckForCancel();
 302
 303   // Notifies the browser a print preview page has been rendered.
 304   // |page_number| is 0-based.
 305   // For a valid |page_number| with modifiable content,
 306   // |metafile| is the rendered page. Otherwise |metafile| is NULL.
 307   // Returns true if print preview should continue, false on failure.
 308   bool PreviewPageRendered(int page_number, PdfMetafileSkia* metafile);
 309
 310   void SetPrintPagesParams(const PrintMsg_PrintPages_Params& settings);
 311
 312   // WebView used only to print the selection.
 313   scoped_ptr<PrepareFrameAndViewForPrint> prep_frame_view_;
 314   bool reset_prep_frame_view_;
 315
 316   scoped_ptr<PrintMsg_PrintPages_Params> print_pages_params_;
 317   bool is_print_ready_metafile_sent_;
 318   bool ignore_css_margins_;
 319
 320   // Used for scripted initiated printing blocking.
 321   bool is_scripted_printing_blocked_;
 322
 323   // Let the browser process know of a printing failure. Only set to false when
 324   // the failure came from the browser in the first place.
 325   bool notify_browser_of_print_failure_;
 326
 327   // True, when printing from print preview.
 328   bool print_for_preview_;
 329
 330   // Keeps track of the state of print preview between messages.
 331   // TODO(vitalybuka): Create PrintPreviewContext when needed and delete after
 332   // use. Now it's interaction with various messages is confusing.
 333   class PrintPreviewContext {
 334    public:
 335     PrintPreviewContext();
 336     ~PrintPreviewContext();
 337
 338     // Initializes the print preview context. Need to be called to set
 339     // the |web_frame| / |web_node| to generate the print preview for.
 340     void InitWithFrame(blink::WebLocalFrame* web_frame);
 341     void InitWithNode(const blink::WebNode& web_node);
 342
 343     // Does bookkeeping at the beginning of print preview.
 344     void OnPrintPreview();
 345
 346     // Create the print preview document. |pages| is empty to print all pages.
 347     // Takes ownership of |prepared_frame|.
 348     bool CreatePreviewDocument(PrepareFrameAndViewForPrint* prepared_frame,
 349                                const std::vector<int>& pages);
 350
 351     // Called after a page gets rendered. |page_time| is how long the
 352     // rendering took.
 353     void RenderedPreviewPage(const base::TimeDelta& page_time);
 354
 355     // Updates the print preview context when the required pages are rendered.
 356     void AllPagesRendered();
 357
 358     // Finalizes the print ready preview document.
 359     void FinalizePrintReadyDocument();
 360
 361     // Cleanup after print preview finishes.
 362     void Finished();
 363
 364     // Cleanup after print preview fails.
 365     void Failed(bool report_error);
 366
 367     // Helper functions
 368     int GetNextPageNumber();
 369     bool IsRendering() const;
 370     bool IsModifiable();
 371     bool HasSelection();
 372     bool IsLastPageOfPrintReadyMetafile() const;
 373     bool IsFinalPageRendered() const;
 374
 375     // Setters
 376     void set_generate_draft_pages(bool generate_draft_pages);
 377     void set_error(enum PrintPreviewErrorBuckets error);
 378
 379     // Getters
 380     // Original frame for which preview was requested.
 381     blink::WebLocalFrame* source_frame();
 382     // Original node for which preview was requested.
 383     const blink::WebNode& source_node() const;
 384
 385     // Frame to be use to render preview. May be the same as source_frame(), or
 386     // generated from it, e.g. copy of selected block.
 387     blink::WebLocalFrame* prepared_frame();
 388     // Node to be use to render preview. May be the same as source_node(), or
 389     // generated from it, e.g. copy of selected block.
 390     const blink::WebNode& prepared_node() const;
 391
 392     int total_page_count() const;
 393     bool generate_draft_pages() const;
 394     PdfMetafileSkia* metafile();
 395     int last_error() const;
 396
 397    private:
 398     enum State {
 399       UNINITIALIZED,  // Not ready to render.
 400       INITIALIZED,    // Ready to render.
 401       RENDERING,      // Rendering.
 402       DONE            // Finished rendering.
 403     };
 404
 405     // Reset some of the internal rendering context.
 406     void ClearContext();
 407
 408     // Specifies what to render for print preview.
 409     FrameReference source_frame_;
 410     blink::WebNode source_node_;
 411
 412     scoped_ptr<PrepareFrameAndViewForPrint> prep_frame_view_;
 413     scoped_ptr<PdfMetafileSkia> metafile_;
 414
 415     // Total page count in the renderer.
 416     int total_page_count_;
 417
 418     // The current page to render.
 419     int current_page_index_;
 420
 421     // List of page indices that need to be rendered.
 422     std::vector<int> pages_to_render_;
 423
 424     // True, when draft pages needs to be generated.
 425     bool generate_draft_pages_;
 426
 427     // Specifies the total number of pages in the print ready metafile.
 428     int print_ready_metafile_page_count_;
 429
 430     base::TimeDelta document_render_time_;
 431     base::TimeTicks begin_time_;
 432
 433     enum PrintPreviewErrorBuckets error_;
 434
 435     State state_;
 436   };
 437
 438   class ScriptingThrottler {
 439    public:
 440     ScriptingThrottler();
 441
 442     // Returns false if script initiated printing occurs too often.
 443     bool IsAllowed(blink::WebFrame* frame);
 444
 445     // Reset the counter for script initiated printing.
 446     // Scripted printing will be allowed to continue.
 447     void Reset();
 448
 449    private:
 450     base::Time last_print_;
 451     int count_ = 0;
 452     DISALLOW_COPY_AND_ASSIGN(ScriptingThrottler);
 453   };
 454
 455   ScriptingThrottler scripting_throttler_;
 456
 457   bool print_node_in_progress_;
 458   PrintPreviewContext print_preview_context_;
 459   bool is_loading_;
 460   bool is_scripted_preview_delayed_;
 461
 462   // Used to fix a race condition where the source is a PDF and print preview
 463   // hangs because RequestPrintPreview is called before DidStopLoading() is
 464   // called. This is a store for the RequestPrintPreview() call and its
 465   // parameters so that it can be invoked after DidStopLoading.
 466   base::Closure on_stop_loading_closure_;
 467
 468   base::WeakPtrFactory<PrintWebViewHelper> weak_ptr_factory_;
 469
 470   DISALLOW_COPY_AND_ASSIGN(PrintWebViewHelper);
 471 };
 472
 473 }  // namespace printing
 474
 475 #endif  // CHROME_RENDERER_PRINTING_PRINT_WEB_VIEW_HELPER_H_