pdf/instance.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 PDF_INSTANCE_H_
   6 #define PDF_INSTANCE_H_
   7
   8 #include <queue>
   9 #include <set>
  10 #include <string>
  11 #include <utility>
  12 #include <vector>
  13
  14 #include "base/memory/scoped_ptr.h"
  15 #include "pdf/button.h"
  16 #include "pdf/fading_controls.h"
  17 #include "pdf/page_indicator.h"
  18 #include "pdf/paint_manager.h"
  19 #include "pdf/pdf_engine.h"
  20 #include "pdf/preview_mode_client.h"
  21 #include "pdf/progress_control.h"
  22 #include "pdf/thumbnail_control.h"
  23
  24 #include "ppapi/c/private/ppb_pdf.h"
  25 #include "ppapi/cpp/dev/printing_dev.h"
  26 #include "ppapi/cpp/dev/scriptable_object_deprecated.h"
  27 #include "ppapi/cpp/dev/scrollbar_dev.h"
  28 #include "ppapi/cpp/dev/selection_dev.h"
  29 #include "ppapi/cpp/dev/widget_client_dev.h"
  30 #include "ppapi/cpp/dev/zoom_dev.h"
  31 #include "ppapi/cpp/graphics_2d.h"
  32 #include "ppapi/cpp/image_data.h"
  33 #include "ppapi/cpp/input_event.h"
  34 #include "ppapi/cpp/private/find_private.h"
  35 #include "ppapi/cpp/private/instance_private.h"
  36 #include "ppapi/cpp/private/var_private.h"
  37 #include "ppapi/cpp/url_loader.h"
  38 #include "ppapi/utility/completion_callback_factory.h"
  39
  40 namespace pp {
  41 class TextInput_Dev;
  42 }
  43
  44 namespace chrome_pdf {
  45
  46 struct ToolbarButtonInfo;
  47
  48 class Instance : public pp::InstancePrivate,
  49                  public pp::Find_Private,
  50                  public pp::Printing_Dev,
  51                  public pp::Selection_Dev,
  52                  public pp::WidgetClient_Dev,
  53                  public pp::Zoom_Dev,
  54                  public PaintManager::Client,
  55                  public PDFEngine::Client,
  56                  public PreviewModeClient::Client,
  57                  public ControlOwner {
  58  public:
  59   explicit Instance(PP_Instance instance);
  60   virtual ~Instance();
  61
  62   // pp::Instance implementation.
  63   virtual bool Init(uint32_t argc,
  64                     const char* argn[],
  65                     const char* argv[]) override;
  66   virtual bool HandleDocumentLoad(const pp::URLLoader& loader) override;
  67   virtual bool HandleInputEvent(const pp::InputEvent& event) override;
  68   virtual void DidChangeView(const pp::View& view) override;
  69   virtual pp::Var GetInstanceObject() override;
  70
  71   // pp::Find_Private implementation.
  72   virtual bool StartFind(const std::string& text, bool case_sensitive) override;
  73   virtual void SelectFindResult(bool forward) override;
  74   virtual void StopFind() override;
  75
  76   // pp::PaintManager::Client implementation.
  77   virtual void OnPaint(const std::vector<pp::Rect>& paint_rects,
  78                        std::vector<PaintManager::ReadyRect>* ready,
  79                        std::vector<pp::Rect>* pending) override;
  80
  81   // pp::Printing_Dev implementation.
  82   virtual uint32_t QuerySupportedPrintOutputFormats() override;
  83   virtual int32_t PrintBegin(
  84       const PP_PrintSettings_Dev& print_settings) override;
  85   virtual pp::Resource PrintPages(
  86       const PP_PrintPageNumberRange_Dev* page_ranges,
  87       uint32_t page_range_count) override;
  88   virtual void PrintEnd() override;
  89   virtual bool IsPrintScalingDisabled() override;
  90
  91   // pp::Private implementation.
  92   virtual pp::Var GetLinkAtPosition(const pp::Point& point);
  93
  94   // PPP_Selection_Dev implementation.
  95   virtual pp::Var GetSelectedText(bool html) override;
  96
  97   // WidgetClient_Dev implementation.
  98   virtual void InvalidateWidget(pp::Widget_Dev widget,
  99                                 const pp::Rect& dirty_rect) override;
 100   virtual void ScrollbarValueChanged(pp::Scrollbar_Dev scrollbar,
 101                                      uint32_t value) override;
 102   virtual void ScrollbarOverlayChanged(pp::Scrollbar_Dev scrollbar,
 103                                        bool overlay) override;
 104
 105   // pp::Zoom_Dev implementation.
 106   virtual void Zoom(double scale, bool text_only) override;
 107   void ZoomChanged(double factor);  // Override.
 108
 109   void FlushCallback(int32_t result);
 110   void DidOpen(int32_t result);
 111   void DidOpenPreview(int32_t result);
 112   // If the given widget intersects the rectangle, paints it and adds the
 113   // rect to ready.
 114   void PaintIfWidgetIntersects(pp::Widget_Dev* widget,
 115                                const pp::Rect& rect,
 116                                std::vector<PaintManager::ReadyRect>* ready,
 117                                std::vector<pp::Rect>* pending);
 118
 119   // Called when the timer is fired.
 120   void OnTimerFired(int32_t);
 121   void OnClientTimerFired(int32_t id);
 122
 123   // Called when the control timer is fired.
 124   void OnControlTimerFired(int32_t,
 125                            const uint32& control_id,
 126                            const uint32& timer_id);
 127
 128   // Called to print without re-entrancy issues.
 129   void OnPrint(int32_t);
 130
 131   // PDFEngine::Client implementation.
 132   void DocumentSizeUpdated(const pp::Size& size) override;
 133   void Invalidate(const pp::Rect& rect) override;
 134   void Scroll(const pp::Point& point) override;
 135   void ScrollToX(int position) override;
 136   void ScrollToY(int position) override;
 137   void ScrollToPage(int page) override;
 138   void NavigateTo(const std::string& url, bool open_in_new_tab) override;
 139   void UpdateCursor(PP_CursorType_Dev cursor) override;
 140   void UpdateTickMarks(const std::vector<pp::Rect>& tickmarks) override;
 141   void NotifyNumberOfFindResultsChanged(int total, bool final_result) override;
 142   void NotifySelectedFindResultChanged(int current_find_index) override;
 143   void GetDocumentPassword(
 144       pp::CompletionCallbackWithOutput<pp::Var> callback) override;
 145   void Alert(const std::string& message) override;
 146   bool Confirm(const std::string& message) override;
 147   std::string Prompt(const std::string& question,
 148                      const std::string& default_answer) override;
 149   std::string GetURL() override;
 150   void Email(const std::string& to,
 151              const std::string& cc,
 152              const std::string& bcc,
 153              const std::string& subject,
 154              const std::string& body) override;
 155   void Print() override;
 156   void SubmitForm(const std::string& url,
 157                   const void* data,
 158                   int length) override;
 159   std::string ShowFileSelectionDialog();
 160   pp::URLLoader CreateURLLoader() override;
 161   void ScheduleCallback(int id, int delay_in_ms) override;
 162   void SearchString(const base::char16* string,
 163                     const base::char16* term,
 164                     bool case_sensitive,
 165                     std::vector<SearchStringResult>* results) override;
 166   void DocumentPaintOccurred() override;
 167   void DocumentLoadComplete(int page_count) override;
 168   void DocumentLoadFailed() override;
 169   pp::Instance* GetPluginInstance() override;
 170   void DocumentHasUnsupportedFeature(const std::string& feature) override;
 171   void DocumentLoadProgress(uint32 available, uint32 doc_size) override;
 172   void FormTextFieldFocusChange(bool in_focus) override;
 173   bool IsPrintPreview() override;
 174
 175   // ControlOwner implementation.
 176   void OnEvent(uint32 control_id, uint32 event_id, void* data) override;
 177   void Invalidate(uint32 control_id, const pp::Rect& rc) override;
 178   uint32 ScheduleTimer(uint32 control_id, uint32 timeout_ms) override;
 179   void SetEventCapture(uint32 control_id, bool set_capture) override;
 180   void SetCursor(uint32 control_id, PP_CursorType_Dev cursor_type) override;
 181   pp::Instance* GetInstance() override;
 182
 183   bool dont_paint() const { return dont_paint_; }
 184   void set_dont_paint(bool dont_paint) { dont_paint_ = dont_paint; }
 185
 186   // Called by PDFScriptableObject.
 187   bool HasScriptableMethod(const pp::Var& method, pp::Var* exception);
 188   pp::Var CallScriptableMethod(const pp::Var& method,
 189                                const std::vector<pp::Var>& args,
 190                                pp::Var* exception);
 191
 192   // PreviewModeClient::Client implementation.
 193   virtual void PreviewDocumentLoadComplete() override;
 194   virtual void PreviewDocumentLoadFailed() override;
 195
 196   // Helper functions for implementing PPP_PDF.
 197   void RotateClockwise();
 198   void RotateCounterclockwise();
 199
 200  private:
 201   // Called whenever the plugin geometry changes to update the location of the
 202   // scrollbars, background parts, and notifies the pdf engine.
 203   void OnGeometryChanged(double old_zoom, float old_device_scale);
 204
 205   // Runs the given JS callback given in |callback|.
 206   void RunCallback(int32_t, pp::Var callback);
 207
 208   void CreateHorizontalScrollbar();
 209   void CreateVerticalScrollbar();
 210   void DestroyHorizontalScrollbar();
 211   void DestroyVerticalScrollbar();
 212
 213   // Returns the thickness of a scrollbar. This returns the thickness when it's
 214   // shown, so for overlay scrollbars it'll still be non-zero.
 215   int GetScrollbarThickness();
 216
 217   // Returns the space we need to reserve for the scrollbar in the plugin area.
 218   // If overlay scrollbars are used, this will be 0.
 219   int GetScrollbarReservedThickness();
 220
 221   // Returns true if overlay scrollbars are in use.
 222   bool IsOverlayScrollbar();
 223
 224   // Figures out the location of any background rectangles (i.e. those that
 225   // aren't painted by the PDF engine).
 226   void CalculateBackgroundParts();
 227
 228   // Computes document width/height in device pixels, based on current zoom and
 229   // device scale
 230   int GetDocumentPixelWidth() const;
 231   int GetDocumentPixelHeight() const;
 232
 233   // Draws a rectangle with the specified dimensions and color in our buffer.
 234   void FillRect(const pp::Rect& rect, uint32 color);
 235
 236   std::vector<pp::ImageData> GetThumbnailResources();
 237   std::vector<pp::ImageData> GetProgressBarResources(pp::ImageData* background);
 238
 239   void CreateToolbar(const ToolbarButtonInfo* tb_info, size_t size);
 240   int GetToolbarRightOffset();
 241   int GetToolbarBottomOffset();
 242   void CreateProgressBar();
 243   void ConfigureProgressBar();
 244   void CreateThumbnails();
 245   void CreatePageIndicator(bool always_visible);
 246   void ConfigurePageIndicator();
 247
 248   void PaintOverlayControl(Control* ctrl,
 249                            pp::ImageData* image_data,
 250                            std::vector<PaintManager::ReadyRect>* ready);
 251
 252   void LoadUrl(const std::string& url);
 253   void LoadPreviewUrl(const std::string& url);
 254   void LoadUrlInternal(const std::string& url, pp::URLLoader* loader,
 255                        void (Instance::* method)(int32_t));
 256
 257   // Creates a URL loader and allows it to access all urls, i.e. not just the
 258   // frame's origin.
 259   pp::URLLoader CreateURLLoaderInternal();
 260
 261   // Figure out the initial page to display based on #page=N and #nameddest=foo
 262   // in the |url_|.
 263   // Returns -1 if there is no valid fragment. The returned value is 0-based,
 264   // whereas page=N is 1-based.
 265   int GetInitialPage(const std::string& url);
 266
 267   void UpdateToolbarPosition(bool invalidate);
 268   void UpdateProgressBarPosition(bool invalidate);
 269   void UpdatePageIndicatorPosition(bool invalidate);
 270
 271   void FormDidOpen(int32_t result);
 272
 273   std::string GetLocalizedString(PP_ResourceString id);
 274
 275   void UserMetricsRecordAction(const std::string& action);
 276
 277   void SaveAs();
 278
 279   enum ZoomMode {
 280     ZOOM_SCALE,  // Standard zooming mode, resize will not affect it.
 281     ZOOM_FIT_TO_WIDTH,  // Maintain fit to width on resize.
 282     ZOOM_FIT_TO_PAGE,  // Maintain fit to page on resize.
 283     ZOOM_AUTO  // Maintain the default auto fitting mode on resize.
 284   };
 285
 286   enum DocumentLoadState {
 287     LOAD_STATE_LOADING,
 288     LOAD_STATE_COMPLETE,
 289     LOAD_STATE_FAILED,
 290   };
 291
 292   // Set new zoom mode and scale. Scale will be ignored if mode != ZOOM_SCALE.
 293   void SetZoom(ZoomMode zoom_mode, double scale);
 294
 295   // Updates internal zoom scale based on the plugin/document geometry and
 296   // current mode.
 297   void UpdateZoomScale();
 298
 299   // Simulates how Chrome "snaps" zooming up/down to the next nearest zoom level
 300   // when the previous zoom level wasn't an integer.  We do this so that
 301   // pressing the zoom buttons has the same effect as the menu buttons, even if
 302   // we start from a non-standard zoom level because of fit-width or fit-height.
 303   double CalculateZoom(uint32 control_id) const;
 304
 305   pp::ImageData CreateResourceImage(PP_ResourceImage image_id);
 306
 307   void DrawText(const pp::Point& top_center, PP_ResourceString id);
 308
 309   // Set print preview mode, where the current PDF document is reduced to
 310   // only one page, and then extended to |page_count| pages with
 311   // |page_count| - 1 blank pages.
 312   void SetPrintPreviewMode(int page_count);
 313
 314   // Returns the page number to be displayed in the page indicator. If the
 315   // plugin is running within print preview, the displayed number might be
 316   // different from the index of the displayed page.
 317   int GetPageNumberToDisplay();
 318
 319   // Process the preview page data information. |src_url| specifies the preview
 320   // page data location. The |src_url| is in the format:
 321   // chrome://print/id/page_number/print.pdf
 322   // |dst_page_index| specifies the blank page index that needs to be replaced
 323   // with the new page data.
 324   void ProcessPreviewPageInfo(const std::string& src_url, int dst_page_index);
 325   // Load the next available preview page into the blank page.
 326   void LoadAvailablePreviewPage();
 327
 328   // Enables autoscroll using origin as a neutral (center) point.
 329   void EnableAutoscroll(const pp::Point& origin);
 330   // Disables autoscroll and returns to normal functionality.
 331   void DisableAutoscroll();
 332   // Calculate autoscroll info and return proper mouse pointer and scroll
 333   // andjustments.
 334   PP_CursorType_Dev CalculateAutoscroll(const pp::Point& mouse_pos);
 335
 336   void ConfigureNumberImageGenerator();
 337
 338   NumberImageGenerator* number_image_generator();
 339
 340   int GetScaled(int x) const;
 341
 342   pp::ImageData image_data_;
 343   // Used when the plugin is embedded in a page and we have to create the loader
 344   // ourself.
 345   pp::CompletionCallbackFactory<Instance> loader_factory_;
 346   pp::URLLoader embed_loader_;
 347   pp::URLLoader embed_preview_loader_;
 348
 349   scoped_ptr<pp::Scrollbar_Dev> h_scrollbar_;
 350   scoped_ptr<pp::Scrollbar_Dev> v_scrollbar_;
 351   int32 valid_v_range_;
 352
 353   PP_CursorType_Dev cursor_;  // The current cursor.
 354
 355   // Used when selecting and dragging beyond the visible portion, in which case
 356   // we want to scroll the document.
 357   bool timer_pending_;
 358   pp::MouseInputEvent last_mouse_event_;
 359   pp::CompletionCallbackFactory<Instance> timer_factory_;
 360   uint32 current_timer_id_;
 361
 362   // Size, in pixels, of plugin rectangle.
 363   pp::Size plugin_size_;
 364   // Size, in DIPs, of plugin rectangle.
 365   pp::Size plugin_dip_size_;
 366   // Remaining area, in pixels, to render the pdf in after accounting for
 367   // scrollbars/toolbars and horizontal centering.
 368   pp::Rect available_area_;
 369   // Size of entire document in pixels (i.e. if each page is 800 pixels high and
 370   // there are 10 pages, the height will be 8000).
 371   pp::Size document_size_;
 372
 373   double zoom_;  // Current zoom factor.
 374
 375   float device_scale_;  // Current device scale factor.
 376   bool printing_enabled_;
 377   bool hidpi_enabled_;
 378   // True if the plugin is full-page.
 379   bool full_;
 380   // Zooming mode (none, fit to width, fit to height)
 381   ZoomMode zoom_mode_;
 382
 383   // If true, this means we told the RenderView that we're starting a network
 384   // request so that it can start the throbber. We will tell it again once the
 385   // document finishes loading.
 386   bool did_call_start_loading_;
 387
 388   // Hold off on painting invalidated requests while this flag is true.
 389   bool dont_paint_;
 390
 391   // Indicates if plugin is in autoscroll mode.
 392   bool is_autoscroll_;
 393   // Rect for autoscroll anchor.
 394   pp::Rect autoscroll_rect_;
 395   // Image of the autoscroll anchor and its background.
 396   pp::ImageData autoscroll_anchor_;
 397   // Autoscrolling deltas in pixels.
 398   int autoscroll_x_;
 399   int autoscroll_y_;
 400
 401   // Thickness of a scrollbar.
 402   int scrollbar_thickness_;
 403
 404   // Reserved thickness of a scrollbar. This is how much space the scrollbar
 405   // takes from the available area. 0 for overlay.
 406   int scrollbar_reserved_thickness_;
 407
 408   // Used to remember which toolbar is in use
 409   const ToolbarButtonInfo* current_tb_info_;
 410   size_t current_tb_info_size_;
 411
 412   PaintManager paint_manager_;
 413
 414   struct BackgroundPart {
 415     pp::Rect location;
 416     uint32 color;
 417   };
 418   std::vector<BackgroundPart> background_parts_;
 419
 420   struct PrintSettings {
 421     PrintSettings() {
 422       Clear();
 423     }
 424     void Clear() {
 425       is_printing = false;
 426       print_pages_called_ = false;
 427       memset(&pepper_print_settings, 0, sizeof(pepper_print_settings));
 428     }
 429     // This is set to true when PrintBegin is called and false when PrintEnd is
 430     // called.
 431     bool is_printing;
 432     // To know whether this was an actual print operation, so we don't double
 433     // count UMA logging.
 434     bool print_pages_called_;
 435     PP_PrintSettings_Dev pepper_print_settings;
 436   };
 437
 438   PrintSettings print_settings_;
 439
 440   scoped_ptr<PDFEngine> engine_;
 441
 442   // This engine is used to render the individual preview page data. This is
 443   // used only in print preview mode. This will use |PreviewModeClient|
 444   // interface which has very limited access to the pp::Instance.
 445   scoped_ptr<PDFEngine> preview_engine_;
 446
 447   std::string url_;
 448
 449   scoped_ptr<FadingControls> toolbar_;
 450   ThumbnailControl thumbnails_;
 451   ProgressControl progress_bar_;
 452   uint32 delayed_progress_timer_id_;
 453   PageIndicator page_indicator_;
 454
 455   // Used for creating images from numbers.
 456   scoped_ptr<NumberImageGenerator> number_image_generator_;
 457
 458   // Used for submitting forms.
 459   pp::CompletionCallbackFactory<Instance> form_factory_;
 460   pp::URLLoader form_loader_;
 461
 462   // Used for generating callbacks.
 463   // TODO(raymes): We don't really need other callback factories we can just
 464   // fold them into this one.
 465   pp::CompletionCallbackFactory<Instance> callback_factory_;
 466
 467   // True if we haven't painted the plugin viewport yet.
 468   bool first_paint_;
 469
 470   // True when we've painted at least one page from the document.
 471   bool painted_first_page_;
 472
 473   // True if we should display page indicator, false otherwise
 474   bool show_page_indicator_;
 475
 476   // Callback when the document load completes.
 477   pp::Var on_load_callback_;
 478   pp::Var on_scroll_callback_;
 479   pp::Var on_plugin_size_changed_callback_;
 480
 481   DocumentLoadState document_load_state_;
 482   DocumentLoadState preview_document_load_state_;
 483
 484   // JavaScript interface to control this instance.
 485   // This wraps a PDFScriptableObject in a pp::Var.
 486   pp::VarPrivate instance_object_;
 487
 488   // Used so that we only tell the browser once about an unsupported feature, to
 489   // avoid the infobar going up more than once.
 490   bool told_browser_about_unsupported_feature_;
 491
 492   // Keeps track of which unsupported features we reported, so we avoid spamming
 493   // the stats if a feature shows up many times per document.
 494   std::set<std::string> unsupported_features_reported_;
 495
 496   // Number of pages in print preview mode, 0 if not in print preview mode.
 497   int print_preview_page_count_;
 498   std::vector<int> print_preview_page_numbers_;
 499
 500   // Used to manage loaded print preview page information. A |PreviewPageInfo|
 501   // consists of data source url string and the page index in the destination
 502   // document.
 503   typedef std::pair<std::string, int> PreviewPageInfo;
 504   std::queue<PreviewPageInfo> preview_pages_info_;
 505
 506   // Used to signal the browser about focus changes to trigger the OSK.
 507   // TODO(abodenha@chromium.org) Implement full IME support in the plugin.
 508   // http://crbug.com/132565
 509   scoped_ptr<pp::TextInput_Dev> text_input_;
 510 };
 511
 512 // This implements the JavaScript class entrypoint for the plugin instance.
 513 // This class is just a thin wrapper. It delegates relevant methods to Instance.
 514 class PDFScriptableObject : public pp::deprecated::ScriptableObject {
 515  public:
 516   explicit PDFScriptableObject(Instance* instance);
 517   virtual ~PDFScriptableObject();
 518
 519   // pp::deprecated::ScriptableObject implementation.
 520   virtual bool HasMethod(const pp::Var& method, pp::Var* exception);
 521   virtual pp::Var Call(const pp::Var& method,
 522                        const std::vector<pp::Var>& args,
 523                        pp::Var* exception);
 524
 525  private:
 526   Instance* instance_;
 527 };
 528
 529 }  // namespace chrome_pdf
 530
 531 #endif  // PDF_INSTANCE_H_