android_webview/renderer/print_web_view_helper.h

   1 // Copyright 2013 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 // TODO(sgurun) copied from chrome/renderer. Remove after crbug.com/322276
   6
   7 #ifndef AW_RENDERER_PRINT_WEB_VIEW_HELPER_H_
   8 #define AW_RENDERER_PRINT_WEB_VIEW_HELPER_H_
   9
  10 #include <vector>
  11
  12 #include "base/gtest_prod_util.h"
  13 #include "base/memory/scoped_ptr.h"
  14 #include "base/memory/shared_memory.h"
  15 #include "base/memory/weak_ptr.h"
  16 #include "base/time/time.h"
  17 #include "content/public/renderer/render_view_observer.h"
  18 #include "content/public/renderer/render_view_observer_tracker.h"
  19 #include "printing/pdf_metafile_skia.h"
  20 #include "third_party/WebKit/public/platform/WebCanvas.h"
  21 #include "third_party/WebKit/public/web/WebNode.h"
  22 #include "third_party/WebKit/public/web/WebPrintParams.h"
  23 #include "ui/gfx/geometry/size.h"
  24
  25 struct PrintMsg_Print_Params;
  26 struct PrintMsg_PrintPage_Params;
  27 struct PrintMsg_PrintPages_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   virtual ~PrintWebViewHelper();
  71
  72   bool IsPrintingEnabled();
  73
  74   void PrintNode(const blink::WebNode& node);
  75
  76  private:
  77   friend class PrintWebViewHelperTestBase;
  78   FRIEND_TEST_ALL_PREFIXES(PrintWebViewHelperTest,
  79                            BlockScriptInitiatedPrinting);
  80   FRIEND_TEST_ALL_PREFIXES(PrintWebViewHelperTest,
  81                            BlockScriptInitiatedPrintingFromPopup);
  82   FRIEND_TEST_ALL_PREFIXES(PrintWebViewHelperTest, OnPrintPages);
  83
  84 #if defined(OS_WIN) || defined(OS_MACOSX)
  85   FRIEND_TEST_ALL_PREFIXES(PrintWebViewHelperTest, PrintLayoutTest);
  86   FRIEND_TEST_ALL_PREFIXES(PrintWebViewHelperTest, PrintWithIframe);
  87 #endif  // defined(OS_WIN) || defined(OS_MACOSX)
  88
  89   enum PrintingResult {
  90     OK,
  91     FAIL_PRINT_INIT,
  92     FAIL_PRINT,
  93     FAIL_PREVIEW,
  94   };
  95
  96   enum PrintPreviewErrorBuckets {
  97     PREVIEW_ERROR_NONE,  // Always first.
  98     PREVIEW_ERROR_BAD_SETTING,
  99     PREVIEW_ERROR_METAFILE_COPY_FAILED,
 100     PREVIEW_ERROR_METAFILE_INIT_FAILED,
 101     PREVIEW_ERROR_ZERO_PAGES,
 102     PREVIEW_ERROR_MAC_DRAFT_METAFILE_INIT_FAILED,
 103     PREVIEW_ERROR_PAGE_RENDERED_WITHOUT_METAFILE,
 104     PREVIEW_ERROR_UPDATING_PRINT_SETTINGS,
 105     PREVIEW_ERROR_INVALID_PRINTER_SETTINGS,
 106     PREVIEW_ERROR_LAST_ENUM  // Always last.
 107   };
 108
 109   enum PrintPreviewRequestType {
 110     PRINT_PREVIEW_USER_INITIATED_ENTIRE_FRAME,
 111     PRINT_PREVIEW_USER_INITIATED_SELECTION,
 112     PRINT_PREVIEW_USER_INITIATED_CONTEXT_NODE,
 113     PRINT_PREVIEW_SCRIPTED  // triggered by window.print().
 114   };
 115
 116   // RenderViewObserver implementation.
 117   virtual bool OnMessageReceived(const IPC::Message& message) override;
 118   virtual void PrintPage(blink::WebLocalFrame* frame,
 119                          bool user_initiated) override;
 120   virtual void DidStartLoading() override;
 121   virtual void DidStopLoading() override;
 122
 123   // Message handlers ---------------------------------------------------------
 124   void OnPrintPages();
 125   void OnPrintForSystemDialog();
 126   void OnInitiatePrintPreview(bool selection_only);
 127   void OnPrintPreview(const base::DictionaryValue& settings);
 128   void OnPrintForPrintPreview(const base::DictionaryValue& job_settings);
 129   void OnPrintingDone(bool success);
 130
 131   // Get |page_size| and |content_area| information from
 132   // |page_layout_in_points|.
 133   void GetPageSizeAndContentAreaFromPageLayout(
 134       const PageSizeMargins& page_layout_in_points,
 135       gfx::Size* page_size,
 136       gfx::Rect* content_area);
 137
 138   // Update |ignore_css_margins_| based on settings.
 139   void UpdateFrameMarginsCssInfo(const base::DictionaryValue& settings);
 140
 141   // Returns true if the current destination printer is PRINT_TO_PDF.
 142   bool IsPrintToPdfRequested(const base::DictionaryValue& settings);
 143
 144   // Returns the print scaling option to retain/scale/crop the source page size
 145   // to fit the printable area of the paper.
 146   //
 147   // We retain the source page size when the current destination printer is
 148   // SAVE_AS_PDF.
 149   //
 150   // We crop the source page size to fit the printable area or we print only the
 151   // left top page contents when
 152   // (1) Source is PDF and the user has requested not to fit to printable area
 153   // via |job_settings|.
 154   // (2) Source is PDF. This is the first preview request and print scaling
 155   // option is disabled for initiator renderer plugin.
 156   //
 157   // In all other cases, we scale the source page to fit the printable area.
 158   blink::WebPrintScalingOption GetPrintScalingOption(
 159       bool source_is_html,
 160       const base::DictionaryValue& job_settings,
 161       const PrintMsg_Print_Params& params);
 162
 163   // Prepare frame for creating preview document.
 164   void PrepareFrameForPreviewDocument();
 165
 166   // Continue creating preview document.
 167   void OnFramePreparedForPreviewDocument();
 168
 169   // Initialize the print preview document.
 170   bool CreatePreviewDocument();
 171
 172   // Renders a print preview page. |page_number| is 0-based.
 173   // Returns true if print preview should continue, false on failure.
 174   bool RenderPreviewPage(int page_number,
 175                          const PrintMsg_Print_Params& print_params);
 176
 177   // Finalize the print ready preview document.
 178   bool FinalizePrintReadyDocument();
 179
 180   // Enable/Disable window.print calls.  If |blocked| is true window.print
 181   // calls will silently fail.  Call with |blocked| set to false to reenable.
 182   void SetScriptedPrintBlocked(bool blocked);
 183
 184   // Main printing code -------------------------------------------------------
 185
 186   void Print(blink::WebLocalFrame* frame, const blink::WebNode& node);
 187
 188   // Notification when printing is done - signal tear-down/free resources.
 189   void DidFinishPrinting(PrintingResult result);
 190
 191   // Print Settings -----------------------------------------------------------
 192
 193   // Initialize print page settings with default settings.
 194   // Used only for native printing workflow.
 195   bool InitPrintSettings(bool fit_to_paper_size);
 196
 197   // Calculate number of pages in source document.
 198   bool CalculateNumberOfPages(blink::WebLocalFrame* frame,
 199                               const blink::WebNode& node,
 200                               int* number_of_pages);
 201
 202   // Update the current print settings with new |passed_job_settings|.
 203   // |passed_job_settings| dictionary contains print job details such as printer
 204   // name, number of copies, page range, etc.
 205   bool UpdatePrintSettings(blink::WebLocalFrame* frame,
 206                            const blink::WebNode& node,
 207                            const base::DictionaryValue& passed_job_settings);
 208
 209   // Get final print settings from the user.
 210   // Return false if the user cancels or on error.
 211   bool GetPrintSettingsFromUser(blink::WebFrame* frame,
 212                                 const blink::WebNode& node,
 213                                 int expected_pages_count);
 214
 215   // Page Printing / Rendering ------------------------------------------------
 216
 217   void OnFramePreparedForPrintPages();
 218   void PrintPages();
 219   bool PrintPagesNative(blink::WebFrame* frame,
 220                         int page_count,
 221                         const gfx::Size& canvas_size);
 222   void FinishFramePrinting();
 223
 224   // Prints the page listed in |params|.
 225 #if defined(OS_LINUX) || defined(OS_ANDROID)
 226   void PrintPageInternal(const PrintMsg_PrintPage_Params& params,
 227                          const gfx::Size& canvas_size,
 228                          blink::WebFrame* frame,
 229                          PdfMetafileSkia* metafile);
 230 #else
 231   void PrintPageInternal(const PrintMsg_PrintPage_Params& params,
 232                          const gfx::Size& canvas_size,
 233                          blink::WebFrame* frame);
 234 #endif
 235
 236   // Render the frame for printing.
 237   bool RenderPagesForPrint(blink::WebLocalFrame* frame,
 238                            const blink::WebNode& node);
 239
 240   // Platform specific helper function for rendering page(s) to |metafile|.
 241 #if defined(OS_WIN)
 242   void RenderPage(const PrintMsg_Print_Params& params,
 243                   int page_number,
 244                   blink::WebFrame* frame,
 245                   bool is_preview,
 246                   PdfMetafileSkia* metafile,
 247                   double* scale_factor,
 248                   gfx::Size* page_size_in_dpi,
 249                   gfx::Rect* content_area_in_dpi);
 250 #elif defined(OS_MACOSX)
 251   void RenderPage(const PrintMsg_Print_Params& params,
 252                   int page_number,
 253                   blink::WebFrame* frame,
 254                   bool is_preview,
 255                   PdfMetafileSkia* metafile,
 256                   gfx::Size* page_size,
 257                   gfx::Rect* content_rect);
 258 #endif  // defined(OS_WIN)
 259
 260   // Renders page contents from |frame| to |content_area| of |canvas|.
 261   // |page_number| is zero-based.
 262   // When method is called, canvas should be setup to draw to |canvas_area|
 263   // with |scale_factor|.
 264   static float RenderPageContent(blink::WebFrame* frame,
 265                                  int page_number,
 266                                  const gfx::Rect& canvas_area,
 267                                  const gfx::Rect& content_area,
 268                                  double scale_factor,
 269                                  blink::WebCanvas* canvas);
 270
 271   // Helper methods -----------------------------------------------------------
 272
 273   bool CopyMetafileDataToSharedMem(PdfMetafileSkia* metafile,
 274                                    base::SharedMemoryHandle* shared_mem_handle);
 275
 276   // Helper method to get page layout in points and fit to page if needed.
 277   static void ComputePageLayoutInPointsForCss(
 278       blink::WebFrame* frame,
 279       int page_index,
 280       const PrintMsg_Print_Params& default_params,
 281       bool ignore_css_margins,
 282       double* scale_factor,
 283       PageSizeMargins* page_layout_in_points);
 284
 285   // Given the |device| and |canvas| to draw on, prints the appropriate headers
 286   // and footers using strings from |header_footer_info| on to the canvas.
 287   static void PrintHeaderAndFooter(
 288       blink::WebCanvas* canvas,
 289       int page_number,
 290       int total_pages,
 291       float webkit_scale_factor,
 292       const PageSizeMargins& page_layout_in_points,
 293       const base::DictionaryValue& header_footer_info,
 294       const PrintMsg_Print_Params& params);
 295
 296   bool GetPrintFrame(blink::WebLocalFrame** frame);
 297
 298   // Script Initiated Printing ------------------------------------------------
 299
 300   // Return true if script initiated printing is currently
 301   // allowed. |user_initiated| should be true when a user event triggered the
 302   // script, most likely by pressing a print button on the page.
 303   bool IsScriptInitiatedPrintAllowed(blink::WebFrame* frame,
 304                                      bool user_initiated);
 305
 306   // Returns true if script initiated printing occurs too often.
 307   bool IsScriptInitiatedPrintTooFrequent(blink::WebFrame* frame);
 308
 309   // Reset the counter for script initiated printing.
 310   // Scripted printing will be allowed to continue.
 311   void ResetScriptedPrintCount();
 312
 313   // Increment the counter for script initiated printing.
 314   // Scripted printing will be blocked for a limited amount of time.
 315   void IncrementScriptedPrintCount();
 316
 317   // Shows scripted print preview when options from plugin are availible.
 318   void ShowScriptedPrintPreview();
 319
 320   void RequestPrintPreview(PrintPreviewRequestType type);
 321
 322   // Checks whether print preview should continue or not.
 323   // Returns true if cancelling, false if continuing.
 324   bool CheckForCancel();
 325
 326   // Notifies the browser a print preview page has been rendered.
 327   // |page_number| is 0-based.
 328   // For a valid |page_number| with modifiable content,
 329   // |metafile| is the rendered page. Otherwise |metafile| is NULL.
 330   // Returns true if print preview should continue, false on failure.
 331   bool PreviewPageRendered(int page_number, PdfMetafileSkia* metafile);
 332
 333   // WebView used only to print the selection.
 334   scoped_ptr<PrepareFrameAndViewForPrint> prep_frame_view_;
 335   bool reset_prep_frame_view_;
 336
 337   scoped_ptr<PrintMsg_PrintPages_Params> print_pages_params_;
 338   bool is_preview_enabled_;
 339   bool is_scripted_print_throttling_disabled_;
 340   bool is_print_ready_metafile_sent_;
 341   bool ignore_css_margins_;
 342
 343   // Used for scripted initiated printing blocking.
 344   base::Time last_cancelled_script_print_;
 345   int user_cancelled_scripted_print_count_;
 346   bool is_scripted_printing_blocked_;
 347
 348   // Let the browser process know of a printing failure. Only set to false when
 349   // the failure came from the browser in the first place.
 350   bool notify_browser_of_print_failure_;
 351
 352   // True, when printing from print preview.
 353   bool print_for_preview_;
 354
 355   // Strings generated by the browser process to be printed as headers and
 356   // footers if requested by the user.
 357   scoped_ptr<base::DictionaryValue> header_footer_info_;
 358
 359   // Keeps track of the state of print preview between messages.
 360   // TODO(vitalybuka): Create PrintPreviewContext when needed and delete after
 361   // use. Now it's interaction with various messages is confusing.
 362   class PrintPreviewContext {
 363    public:
 364     PrintPreviewContext();
 365     ~PrintPreviewContext();
 366
 367     // Initializes the print preview context. Need to be called to set
 368     // the |web_frame| / |web_node| to generate the print preview for.
 369     void InitWithFrame(blink::WebLocalFrame* web_frame);
 370     void InitWithNode(const blink::WebNode& web_node);
 371
 372     // Does bookkeeping at the beginning of print preview.
 373     void OnPrintPreview();
 374
 375     // Create the print preview document. |pages| is empty to print all pages.
 376     // Takes ownership of |prepared_frame|.
 377     bool CreatePreviewDocument(PrepareFrameAndViewForPrint* prepared_frame,
 378                                const std::vector<int>& pages);
 379
 380     // Called after a page gets rendered. |page_time| is how long the
 381     // rendering took.
 382     void RenderedPreviewPage(const base::TimeDelta& page_time);
 383
 384     // Updates the print preview context when the required pages are rendered.
 385     void AllPagesRendered();
 386
 387     // Finalizes the print ready preview document.
 388     void FinalizePrintReadyDocument();
 389
 390     // Cleanup after print preview finishes.
 391     void Finished();
 392
 393     // Cleanup after print preview fails.
 394     void Failed(bool report_error);
 395
 396     // Helper functions
 397     int GetNextPageNumber();
 398     bool IsRendering() const;
 399     bool IsModifiable();
 400     bool HasSelection();
 401     bool IsLastPageOfPrintReadyMetafile() const;
 402     bool IsFinalPageRendered() const;
 403
 404     // Setters
 405     void set_generate_draft_pages(bool generate_draft_pages);
 406     void set_error(enum PrintPreviewErrorBuckets error);
 407
 408     // Getters
 409     // Original frame for which preview was requested.
 410     blink::WebLocalFrame* source_frame();
 411     // Original node for which preview was requested.
 412     const blink::WebNode& source_node() const;
 413
 414     // Frame to be use to render preview. May be the same as source_frame(), or
 415     // generated from it, e.g. copy of selected block.
 416     blink::WebLocalFrame* prepared_frame();
 417     // Node to be use to render preview. May be the same as source_node(), or
 418     // generated from it, e.g. copy of selected block.
 419     const blink::WebNode& prepared_node() const;
 420
 421     int total_page_count() const;
 422     bool generate_draft_pages() const;
 423     PdfMetafileSkia* metafile();
 424     gfx::Size GetPrintCanvasSize() const;
 425     int last_error() const;
 426
 427    private:
 428     enum State {
 429       UNINITIALIZED,  // Not ready to render.
 430       INITIALIZED,    // Ready to render.
 431       RENDERING,      // Rendering.
 432       DONE            // Finished rendering.
 433     };
 434
 435     // Reset some of the internal rendering context.
 436     void ClearContext();
 437
 438     // Specifies what to render for print preview.
 439     FrameReference source_frame_;
 440     blink::WebNode source_node_;
 441
 442     scoped_ptr<PrepareFrameAndViewForPrint> prep_frame_view_;
 443     scoped_ptr<PdfMetafileSkia> metafile_;
 444
 445     // Total page count in the renderer.
 446     int total_page_count_;
 447
 448     // The current page to render.
 449     int current_page_index_;
 450
 451     // List of page indices that need to be rendered.
 452     std::vector<int> pages_to_render_;
 453
 454     // True, when draft pages needs to be generated.
 455     bool generate_draft_pages_;
 456
 457     // Specifies the total number of pages in the print ready metafile.
 458     int print_ready_metafile_page_count_;
 459
 460     base::TimeDelta document_render_time_;
 461     base::TimeTicks begin_time_;
 462
 463     enum PrintPreviewErrorBuckets error_;
 464
 465     State state_;
 466   };
 467
 468   bool print_node_in_progress_;
 469   PrintPreviewContext print_preview_context_;
 470   bool is_loading_;
 471   bool is_scripted_preview_delayed_;
 472   base::WeakPtrFactory<PrintWebViewHelper> weak_ptr_factory_;
 473   DISALLOW_COPY_AND_ASSIGN(PrintWebViewHelper);
 474 };
 475
 476 }  // namespace printing
 477
 478 #endif  // AW_RENDERER_PRINT_WEB_VIEW_HELPER_H_