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      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 #include "chrome/browser/ui/webui/print_preview/print_preview_ui.h"
      6 
      7 #include <map>
      8 
      9 #include "base/id_map.h"
     10 #include "base/lazy_instance.h"
     11 #include "base/memory/ref_counted_memory.h"
     12 #include "base/metrics/histogram.h"
     13 #include "base/strings/string_number_conversions.h"
     14 #include "base/strings/string_split.h"
     15 #include "base/strings/string_util.h"
     16 #include "base/strings/utf_string_conversions.h"
     17 #include "base/synchronization/lock.h"
     18 #include "base/values.h"
     19 #include "chrome/browser/browser_process.h"
     20 #include "chrome/browser/printing/background_printing_manager.h"
     21 #include "chrome/browser/printing/print_preview_data_service.h"
     22 #include "chrome/browser/profiles/profile.h"
     23 #include "chrome/browser/ui/webui/print_preview/print_preview_handler.h"
     24 #include "chrome/browser/ui/webui/theme_source.h"
     25 #include "chrome/common/print_messages.h"
     26 #include "chrome/common/url_constants.h"
     27 #include "content/public/browser/url_data_source.h"
     28 #include "content/public/browser/web_contents.h"
     29 #include "content/public/browser/web_ui_data_source.h"
     30 #include "grit/browser_resources.h"
     31 #include "grit/chromium_strings.h"
     32 #include "grit/generated_resources.h"
     33 #include "grit/google_chrome_strings.h"
     34 #include "printing/page_size_margins.h"
     35 #include "printing/print_job_constants.h"
     36 #include "ui/base/l10n/l10n_util.h"
     37 #include "ui/gfx/rect.h"
     38 #include "ui/web_dialogs/web_dialog_delegate.h"
     39 #include "ui/web_dialogs/web_dialog_ui.h"
     40 
     41 using content::WebContents;
     42 using printing::PageSizeMargins;
     43 
     44 namespace {
     45 
     46 #if defined(OS_MACOSX)
     47 // U+0028 U+21E7 U+2318 U+0050 U+0029 in UTF8
     48 const char kAdvancedPrintShortcut[] = "\x28\xE2\x8c\xA5\xE2\x8C\x98\x50\x29";
     49 #elif defined(OS_WIN)
     50 const char kAdvancedPrintShortcut[] = "(Ctrl+Shift+P)";
     51 #else
     52 const char kAdvancedPrintShortcut[] = "(Shift+Ctrl+P)";
     53 #endif
     54 
     55 // Thread-safe wrapper around a std::map to keep track of mappings from
     56 // PrintPreviewUI IDs to most recent print preview request IDs.
     57 class PrintPreviewRequestIdMapWithLock {
     58  public:
     59   PrintPreviewRequestIdMapWithLock() {}
     60   ~PrintPreviewRequestIdMapWithLock() {}
     61 
     62   // Gets the value for |preview_id|.
     63   // Returns true and sets |out_value| on success.
     64   bool Get(int32 preview_id, int* out_value) {
     65     base::AutoLock lock(lock_);
     66     PrintPreviewRequestIdMap::const_iterator it = map_.find(preview_id);
     67     if (it == map_.end())
     68       return false;
     69     *out_value = it->second;
     70     return true;
     71   }
     72 
     73   // Sets the |value| for |preview_id|.
     74   void Set(int32 preview_id, int value) {
     75     base::AutoLock lock(lock_);
     76     map_[preview_id] = value;
     77   }
     78 
     79   // Erases the entry for |preview_id|.
     80   void Erase(int32 preview_id) {
     81     base::AutoLock lock(lock_);
     82     map_.erase(preview_id);
     83   }
     84 
     85  private:
     86   // Mapping from PrintPreviewUI ID to print preview request ID.
     87   typedef std::map<int, int> PrintPreviewRequestIdMap;
     88 
     89   PrintPreviewRequestIdMap map_;
     90   base::Lock lock_;
     91 
     92   DISALLOW_COPY_AND_ASSIGN(PrintPreviewRequestIdMapWithLock);
     93 };
     94 
     95 // Written to on the UI thread, read from any thread.
     96 base::LazyInstance<PrintPreviewRequestIdMapWithLock>
     97     g_print_preview_request_id_map = LAZY_INSTANCE_INITIALIZER;
     98 
     99 // PrintPreviewUI IDMap used to avoid exposing raw pointer addresses to WebUI.
    100 // Only accessed on the UI thread.
    101 base::LazyInstance<IDMap<PrintPreviewUI> >
    102     g_print_preview_ui_id_map = LAZY_INSTANCE_INITIALIZER;
    103 
    104 // PrintPreviewUI serves data for chrome://print requests.
    105 //
    106 // The format for requesting PDF data is as follows:
    107 // chrome://print/<PrintPreviewUIID>/<PageIndex>/print.pdf
    108 //
    109 // Parameters (< > required):
    110 //    <PrintPreviewUIID> = PrintPreview UI ID
    111 //    <PageIndex> = Page index is zero-based or
    112 //                  |printing::COMPLETE_PREVIEW_DOCUMENT_INDEX| to represent
    113 //                  a print ready PDF.
    114 //
    115 // Example:
    116 //    chrome://print/123/10/print.pdf
    117 //
    118 // Requests to chrome://print with paths not ending in /print.pdf are used
    119 // to return the markup or other resources for the print preview page itself.
    120 bool HandleRequestCallback(
    121     const std::string& path,
    122     const content::WebUIDataSource::GotDataCallback& callback) {
    123   // ChromeWebUIDataSource handles most requests except for the print preview
    124   // data.
    125   if (!EndsWith(path, "/print.pdf", true))
    126     return false;
    127 
    128   // Print Preview data.
    129   scoped_refptr<base::RefCountedBytes> data;
    130   std::vector<std::string> url_substr;
    131   base::SplitString(path, '/', &url_substr);
    132   int preview_ui_id = -1;
    133   int page_index = 0;
    134   if (url_substr.size() == 3 &&
    135       base::StringToInt(url_substr[0], &preview_ui_id),
    136       base::StringToInt(url_substr[1], &page_index) &&
    137       preview_ui_id >= 0) {
    138     PrintPreviewDataService::GetInstance()->GetDataEntry(
    139         preview_ui_id, page_index, &data);
    140   }
    141   if (data.get()) {
    142     callback.Run(data.get());
    143     return true;
    144   }
    145   // Invalid request.
    146   scoped_refptr<base::RefCountedBytes> empty_bytes(new base::RefCountedBytes);
    147   callback.Run(empty_bytes.get());
    148   return true;
    149 }
    150 
    151 content::WebUIDataSource* CreatePrintPreviewUISource() {
    152   content::WebUIDataSource* source =
    153       content::WebUIDataSource::Create(chrome::kChromeUIPrintHost);
    154 #if defined(OS_CHROMEOS)
    155   source->AddLocalizedString("title",
    156                              IDS_PRINT_PREVIEW_GOOGLE_CLOUD_PRINT_TITLE);
    157 #else
    158   source->AddLocalizedString("title", IDS_PRINT_PREVIEW_TITLE);
    159 #endif
    160   source->AddLocalizedString("loading", IDS_PRINT_PREVIEW_LOADING);
    161   source->AddLocalizedString("noPlugin", IDS_PRINT_PREVIEW_NO_PLUGIN);
    162   source->AddLocalizedString("launchNativeDialog",
    163                              IDS_PRINT_PREVIEW_NATIVE_DIALOG);
    164   source->AddLocalizedString("previewFailed", IDS_PRINT_PREVIEW_FAILED);
    165   source->AddLocalizedString("invalidPrinterSettings",
    166                              IDS_PRINT_PREVIEW_INVALID_PRINTER_SETTINGS);
    167   source->AddLocalizedString("printButton", IDS_PRINT_PREVIEW_PRINT_BUTTON);
    168   source->AddLocalizedString("saveButton", IDS_PRINT_PREVIEW_SAVE_BUTTON);
    169   source->AddLocalizedString("cancelButton", IDS_PRINT_PREVIEW_CANCEL_BUTTON);
    170   source->AddLocalizedString("printing", IDS_PRINT_PREVIEW_PRINTING);
    171   source->AddLocalizedString("printingToPDFInProgress",
    172                              IDS_PRINT_PREVIEW_PRINTING_TO_PDF_IN_PROGRESS);
    173 #if defined(OS_MACOSX)
    174   source->AddLocalizedString("openingPDFInPreview",
    175                              IDS_PRINT_PREVIEW_OPENING_PDF_IN_PREVIEW);
    176 #endif
    177   source->AddLocalizedString("destinationLabel",
    178                              IDS_PRINT_PREVIEW_DESTINATION_LABEL);
    179   source->AddLocalizedString("copiesLabel", IDS_PRINT_PREVIEW_COPIES_LABEL);
    180   source->AddLocalizedString("examplePageRangeText",
    181                              IDS_PRINT_PREVIEW_EXAMPLE_PAGE_RANGE_TEXT);
    182   source->AddLocalizedString("layoutLabel", IDS_PRINT_PREVIEW_LAYOUT_LABEL);
    183   source->AddLocalizedString("optionAllPages",
    184                              IDS_PRINT_PREVIEW_OPTION_ALL_PAGES);
    185   source->AddLocalizedString("optionBw", IDS_PRINT_PREVIEW_OPTION_BW);
    186   source->AddLocalizedString("optionCollate", IDS_PRINT_PREVIEW_OPTION_COLLATE);
    187   source->AddLocalizedString("optionColor", IDS_PRINT_PREVIEW_OPTION_COLOR);
    188   source->AddLocalizedString("optionLandscape",
    189                              IDS_PRINT_PREVIEW_OPTION_LANDSCAPE);
    190   source->AddLocalizedString("optionPortrait",
    191                              IDS_PRINT_PREVIEW_OPTION_PORTRAIT);
    192   source->AddLocalizedString("optionTwoSided",
    193                              IDS_PRINT_PREVIEW_OPTION_TWO_SIDED);
    194   source->AddLocalizedString("pagesLabel", IDS_PRINT_PREVIEW_PAGES_LABEL);
    195   source->AddLocalizedString("pageRangeTextBox",
    196                              IDS_PRINT_PREVIEW_PAGE_RANGE_TEXT);
    197   source->AddLocalizedString("pageRangeRadio",
    198                              IDS_PRINT_PREVIEW_PAGE_RANGE_RADIO);
    199   source->AddLocalizedString("printToPDF", IDS_PRINT_PREVIEW_PRINT_TO_PDF);
    200   source->AddLocalizedString("printPreviewSummaryFormatShort",
    201                              IDS_PRINT_PREVIEW_SUMMARY_FORMAT_SHORT);
    202   source->AddLocalizedString("printPreviewSummaryFormatLong",
    203                              IDS_PRINT_PREVIEW_SUMMARY_FORMAT_LONG);
    204   source->AddLocalizedString("printPreviewSheetsLabelSingular",
    205                              IDS_PRINT_PREVIEW_SHEETS_LABEL_SINGULAR);
    206   source->AddLocalizedString("printPreviewSheetsLabelPlural",
    207                              IDS_PRINT_PREVIEW_SHEETS_LABEL_PLURAL);
    208   source->AddLocalizedString("printPreviewPageLabelSingular",
    209                              IDS_PRINT_PREVIEW_PAGE_LABEL_SINGULAR);
    210   source->AddLocalizedString("printPreviewPageLabelPlural",
    211                              IDS_PRINT_PREVIEW_PAGE_LABEL_PLURAL);
    212   const string16 shortcut_text(UTF8ToUTF16(kAdvancedPrintShortcut));
    213 #if defined(OS_CHROMEOS)
    214   source->AddString(
    215       "systemDialogOption",
    216       l10n_util::GetStringFUTF16(
    217           IDS_PRINT_PREVIEW_CLOUD_DIALOG_OPTION,
    218           l10n_util::GetStringUTF16(IDS_GOOGLE_CLOUD_PRINT),
    219           shortcut_text));
    220 #else
    221   source->AddString(
    222       "systemDialogOption",
    223       l10n_util::GetStringFUTF16(
    224           IDS_PRINT_PREVIEW_SYSTEM_DIALOG_OPTION,
    225           shortcut_text));
    226 #endif
    227   source->AddString(
    228       "cloudPrintDialogOption",
    229       l10n_util::GetStringFUTF16(
    230           IDS_PRINT_PREVIEW_CLOUD_DIALOG_OPTION_NO_SHORTCUT,
    231           l10n_util::GetStringUTF16(IDS_GOOGLE_CLOUD_PRINT)));
    232 #if defined(OS_MACOSX)
    233   source->AddLocalizedString("openPdfInPreviewOption",
    234                              IDS_PRINT_PREVIEW_OPEN_PDF_IN_PREVIEW_APP);
    235 #endif
    236   source->AddString(
    237       "printWithCloudPrintWait",
    238       l10n_util::GetStringFUTF16(
    239         IDS_PRINT_PREVIEW_PRINT_WITH_CLOUD_PRINT_WAIT,
    240         l10n_util::GetStringUTF16(IDS_GOOGLE_CLOUD_PRINT)));
    241   source->AddLocalizedString("pageRangeInstruction",
    242                              IDS_PRINT_PREVIEW_PAGE_RANGE_INSTRUCTION);
    243   source->AddLocalizedString("copiesInstruction",
    244                              IDS_PRINT_PREVIEW_COPIES_INSTRUCTION);
    245   source->AddLocalizedString("incrementTitle",
    246                              IDS_PRINT_PREVIEW_INCREMENT_TITLE);
    247   source->AddLocalizedString("decrementTitle",
    248                              IDS_PRINT_PREVIEW_DECREMENT_TITLE);
    249   source->AddLocalizedString("printPagesLabel",
    250                              IDS_PRINT_PREVIEW_PRINT_PAGES_LABEL);
    251   source->AddLocalizedString("optionsLabel", IDS_PRINT_PREVIEW_OPTIONS_LABEL);
    252   source->AddLocalizedString("optionHeaderFooter",
    253                              IDS_PRINT_PREVIEW_OPTION_HEADER_FOOTER);
    254   source->AddLocalizedString("optionFitToPage",
    255                              IDS_PRINT_PREVIEW_OPTION_FIT_TO_PAGE);
    256   source->AddLocalizedString(
    257       "optionBackgroundColorsAndImages",
    258       IDS_PRINT_PREVIEW_OPTION_BACKGROUND_COLORS_AND_IMAGES);
    259   source->AddLocalizedString("optionSelectionOnly",
    260                              IDS_PRINT_PREVIEW_OPTION_SELECTION_ONLY);
    261   source->AddLocalizedString("marginsLabel", IDS_PRINT_PREVIEW_MARGINS_LABEL);
    262   source->AddLocalizedString("defaultMargins",
    263                              IDS_PRINT_PREVIEW_DEFAULT_MARGINS);
    264   source->AddLocalizedString("noMargins", IDS_PRINT_PREVIEW_NO_MARGINS);
    265   source->AddLocalizedString("customMargins", IDS_PRINT_PREVIEW_CUSTOM_MARGINS);
    266   source->AddLocalizedString("minimumMargins",
    267                              IDS_PRINT_PREVIEW_MINIMUM_MARGINS);
    268   source->AddLocalizedString("top", IDS_PRINT_PREVIEW_TOP_MARGIN_LABEL);
    269   source->AddLocalizedString("bottom", IDS_PRINT_PREVIEW_BOTTOM_MARGIN_LABEL);
    270   source->AddLocalizedString("left", IDS_PRINT_PREVIEW_LEFT_MARGIN_LABEL);
    271   source->AddLocalizedString("right", IDS_PRINT_PREVIEW_RIGHT_MARGIN_LABEL);
    272   source->AddLocalizedString("destinationSearchTitle",
    273                              IDS_PRINT_PREVIEW_DESTINATION_SEARCH_TITLE);
    274   source->AddLocalizedString("userInfo", IDS_PRINT_PREVIEW_USER_INFO);
    275   source->AddLocalizedString("cloudPrintPromotion",
    276                              IDS_PRINT_PREVIEW_CLOUD_PRINT_PROMOTION);
    277   source->AddLocalizedString("searchBoxPlaceholder",
    278                              IDS_PRINT_PREVIEW_SEARCH_BOX_PLACEHOLDER);
    279   source->AddLocalizedString("noDestinationsMessage",
    280                              IDS_PRINT_PREVIEW_NO_DESTINATIONS_MESSAGE);
    281   source->AddLocalizedString("showAllButtonText",
    282                              IDS_PRINT_PREVIEW_SHOW_ALL_BUTTON_TEXT);
    283   source->AddLocalizedString("destinationCount",
    284                              IDS_PRINT_PREVIEW_DESTINATION_COUNT);
    285   source->AddLocalizedString("recentDestinationsTitle",
    286                              IDS_PRINT_PREVIEW_RECENT_DESTINATIONS_TITLE);
    287   source->AddLocalizedString("localDestinationsTitle",
    288                              IDS_PRINT_PREVIEW_LOCAL_DESTINATIONS_TITLE);
    289   source->AddLocalizedString("cloudDestinationsTitle",
    290                              IDS_PRINT_PREVIEW_CLOUD_DESTINATIONS_TITLE);
    291   source->AddLocalizedString("manage", IDS_PRINT_PREVIEW_MANAGE);
    292   source->AddLocalizedString("setupCloudPrinters",
    293                              IDS_PRINT_PREVIEW_SETUP_CLOUD_PRINTERS);
    294   source->AddLocalizedString("changeDestination",
    295                              IDS_PRINT_PREVIEW_CHANGE_DESTINATION);
    296   source->AddLocalizedString("offlineForYear",
    297                              IDS_PRINT_PREVIEW_OFFLINE_FOR_YEAR);
    298   source->AddLocalizedString("offlineForMonth",
    299                              IDS_PRINT_PREVIEW_OFFLINE_FOR_MONTH);
    300   source->AddLocalizedString("offlineForWeek",
    301                              IDS_PRINT_PREVIEW_OFFLINE_FOR_WEEK);
    302   source->AddLocalizedString("offline", IDS_PRINT_PREVIEW_OFFLINE);
    303   source->AddLocalizedString("fedexTos", IDS_PRINT_PREVIEW_FEDEX_TOS);
    304   source->AddLocalizedString("tosCheckboxLabel",
    305                              IDS_PRINT_PREVIEW_TOS_CHECKBOX_LABEL);
    306   source->AddLocalizedString("noDestsPromoTitle",
    307                              IDS_PRINT_PREVIEW_NO_DESTS_PROMO_TITLE);
    308   source->AddLocalizedString("noDestsPromoBody",
    309                              IDS_PRINT_PREVIEW_NO_DESTS_PROMO_BODY);
    310   source->AddLocalizedString("noDestsPromoGcpDesc",
    311                              IDS_PRINT_PREVIEW_NO_DESTS_GCP_DESC);
    312   source->AddLocalizedString(
    313       "noDestsPromoAddPrinterButtonLabel",
    314       IDS_PRINT_PREVIEW_NO_DESTS_PROMO_ADD_PRINTER_BUTTON_LABEL);
    315   source->AddLocalizedString(
    316       "noDestsPromoNotNowButtonLabel",
    317       IDS_PRINT_PREVIEW_NO_DESTS_PROMO_NOT_NOW_BUTTON_LABEL);
    318 
    319   source->SetJsonPath("strings.js");
    320   source->AddResourcePath("print_preview.js", IDR_PRINT_PREVIEW_JS);
    321   source->AddResourcePath("images/printer.png",
    322                           IDR_PRINT_PREVIEW_IMAGES_PRINTER);
    323   source->AddResourcePath("images/printer_shared.png",
    324                           IDR_PRINT_PREVIEW_IMAGES_PRINTER_SHARED);
    325   source->AddResourcePath("images/third_party.png",
    326                           IDR_PRINT_PREVIEW_IMAGES_THIRD_PARTY);
    327   source->AddResourcePath("images/third_party_fedex.png",
    328                           IDR_PRINT_PREVIEW_IMAGES_THIRD_PARTY_FEDEX);
    329   source->AddResourcePath("images/google_doc.png",
    330                           IDR_PRINT_PREVIEW_IMAGES_GOOGLE_DOC);
    331   source->AddResourcePath("images/pdf.png", IDR_PRINT_PREVIEW_IMAGES_PDF);
    332   source->AddResourcePath("images/mobile.png", IDR_PRINT_PREVIEW_IMAGES_MOBILE);
    333   source->AddResourcePath("images/mobile_shared.png",
    334                           IDR_PRINT_PREVIEW_IMAGES_MOBILE_SHARED);
    335   source->SetDefaultResource(IDR_PRINT_PREVIEW_HTML);
    336   source->SetRequestFilter(base::Bind(&HandleRequestCallback));
    337   source->OverrideContentSecurityPolicyObjectSrc("object-src 'self';");
    338   return source;
    339 }
    340 
    341 }  // namespace
    342 
    343 PrintPreviewUI::PrintPreviewUI(content::WebUI* web_ui)
    344     : ConstrainedWebDialogUI(web_ui),
    345       initial_preview_start_time_(base::TimeTicks::Now()),
    346       id_(g_print_preview_ui_id_map.Get().Add(this)),
    347       handler_(NULL),
    348       source_is_modifiable_(true),
    349       source_has_selection_(false),
    350       dialog_closed_(false) {
    351   // Set up the chrome://print/ data source.
    352   Profile* profile = Profile::FromWebUI(web_ui);
    353   content::WebUIDataSource::Add(profile, CreatePrintPreviewUISource());
    354 
    355   // Set up the chrome://theme/ source.
    356   content::URLDataSource::Add(profile, new ThemeSource(profile));
    357 
    358   // WebUI owns |handler_|.
    359   handler_ = new PrintPreviewHandler();
    360   web_ui->AddMessageHandler(handler_);
    361 
    362   g_print_preview_request_id_map.Get().Set(id_, -1);
    363 }
    364 
    365 PrintPreviewUI::~PrintPreviewUI() {
    366   print_preview_data_service()->RemoveEntry(id_);
    367   g_print_preview_request_id_map.Get().Erase(id_);
    368   g_print_preview_ui_id_map.Get().Remove(id_);
    369 }
    370 
    371 void PrintPreviewUI::GetPrintPreviewDataForIndex(
    372     int index,
    373     scoped_refptr<base::RefCountedBytes>* data) {
    374   print_preview_data_service()->GetDataEntry(id_, index, data);
    375 }
    376 
    377 void PrintPreviewUI::SetPrintPreviewDataForIndex(
    378     int index,
    379     const base::RefCountedBytes* data) {
    380   print_preview_data_service()->SetDataEntry(id_, index, data);
    381 }
    382 
    383 void PrintPreviewUI::ClearAllPreviewData() {
    384   print_preview_data_service()->RemoveEntry(id_);
    385 }
    386 
    387 int PrintPreviewUI::GetAvailableDraftPageCount() {
    388   return print_preview_data_service()->GetAvailableDraftPageCount(id_);
    389 }
    390 
    391 void PrintPreviewUI::SetInitiatorTitle(
    392     const string16& job_title) {
    393   initiator_title_ = job_title;
    394 }
    395 
    396 // static
    397 void PrintPreviewUI::SetInitialParams(
    398     content::WebContents* print_preview_dialog,
    399     const PrintHostMsg_RequestPrintPreview_Params& params) {
    400   if (!print_preview_dialog || !print_preview_dialog->GetWebUI())
    401     return;
    402   PrintPreviewUI* print_preview_ui = static_cast<PrintPreviewUI*>(
    403       print_preview_dialog->GetWebUI()->GetController());
    404   print_preview_ui->source_is_modifiable_ = params.is_modifiable;
    405   print_preview_ui->source_has_selection_ = params.has_selection;
    406   print_preview_ui->print_selection_only_ = params.selection_only;
    407 }
    408 
    409 // static
    410 void PrintPreviewUI::GetCurrentPrintPreviewStatus(int32 preview_ui_id,
    411                                                   int request_id,
    412                                                   bool* cancel) {
    413   int current_id = -1;
    414   if (!g_print_preview_request_id_map.Get().Get(preview_ui_id, &current_id)) {
    415     *cancel = true;
    416     return;
    417   }
    418   *cancel = (request_id != current_id);
    419 }
    420 
    421 int32 PrintPreviewUI::GetIDForPrintPreviewUI() const {
    422   return id_;
    423 }
    424 
    425 void PrintPreviewUI::OnPrintPreviewDialogClosed() {
    426   WebContents* preview_dialog = web_ui()->GetWebContents();
    427   printing::BackgroundPrintingManager* background_printing_manager =
    428       g_browser_process->background_printing_manager();
    429   if (background_printing_manager->HasPrintPreviewDialog(preview_dialog))
    430     return;
    431   OnClosePrintPreviewDialog();
    432 }
    433 
    434 void PrintPreviewUI::OnInitiatorClosed() {
    435   WebContents* preview_dialog = web_ui()->GetWebContents();
    436   printing::BackgroundPrintingManager* background_printing_manager =
    437       g_browser_process->background_printing_manager();
    438   if (background_printing_manager->HasPrintPreviewDialog(preview_dialog))
    439     web_ui()->CallJavascriptFunction("cancelPendingPrintRequest");
    440   else
    441     OnClosePrintPreviewDialog();
    442 }
    443 
    444 void PrintPreviewUI::OnPrintPreviewRequest(int request_id) {
    445   g_print_preview_request_id_map.Get().Set(id_, request_id);
    446 }
    447 
    448 void PrintPreviewUI::OnShowSystemDialog() {
    449   web_ui()->CallJavascriptFunction("onSystemDialogLinkClicked");
    450 }
    451 
    452 void PrintPreviewUI::OnDidGetPreviewPageCount(
    453     const PrintHostMsg_DidGetPreviewPageCount_Params& params) {
    454   DCHECK_GT(params.page_count, 0);
    455   base::FundamentalValue count(params.page_count);
    456   base::FundamentalValue request_id(params.preview_request_id);
    457   web_ui()->CallJavascriptFunction("onDidGetPreviewPageCount",
    458                                    count,
    459                                    request_id);
    460 }
    461 
    462 void PrintPreviewUI::OnDidGetDefaultPageLayout(
    463     const PageSizeMargins& page_layout, const gfx::Rect& printable_area,
    464     bool has_custom_page_size_style) {
    465   if (page_layout.margin_top < 0 || page_layout.margin_left < 0 ||
    466       page_layout.margin_bottom < 0 || page_layout.margin_right < 0 ||
    467       page_layout.content_width < 0 || page_layout.content_height < 0 ||
    468       printable_area.width() <= 0 || printable_area.height() <= 0) {
    469     NOTREACHED();
    470     return;
    471   }
    472 
    473   base::DictionaryValue layout;
    474   layout.SetDouble(printing::kSettingMarginTop, page_layout.margin_top);
    475   layout.SetDouble(printing::kSettingMarginLeft, page_layout.margin_left);
    476   layout.SetDouble(printing::kSettingMarginBottom, page_layout.margin_bottom);
    477   layout.SetDouble(printing::kSettingMarginRight, page_layout.margin_right);
    478   layout.SetDouble(printing::kSettingContentWidth, page_layout.content_width);
    479   layout.SetDouble(printing::kSettingContentHeight, page_layout.content_height);
    480   layout.SetInteger(printing::kSettingPrintableAreaX, printable_area.x());
    481   layout.SetInteger(printing::kSettingPrintableAreaY, printable_area.y());
    482   layout.SetInteger(printing::kSettingPrintableAreaWidth,
    483                     printable_area.width());
    484   layout.SetInteger(printing::kSettingPrintableAreaHeight,
    485                     printable_area.height());
    486 
    487   base::FundamentalValue has_page_size_style(has_custom_page_size_style);
    488   web_ui()->CallJavascriptFunction("onDidGetDefaultPageLayout", layout,
    489                                    has_page_size_style);
    490 }
    491 
    492 void PrintPreviewUI::OnDidPreviewPage(int page_number,
    493                                       int preview_request_id) {
    494   DCHECK_GE(page_number, 0);
    495   base::FundamentalValue number(page_number);
    496   base::FundamentalValue ui_identifier(id_);
    497   base::FundamentalValue request_id(preview_request_id);
    498   web_ui()->CallJavascriptFunction(
    499       "onDidPreviewPage", number, ui_identifier, request_id);
    500 }
    501 
    502 void PrintPreviewUI::OnReusePreviewData(int preview_request_id) {
    503   base::FundamentalValue ui_identifier(id_);
    504   base::FundamentalValue ui_preview_request_id(preview_request_id);
    505   web_ui()->CallJavascriptFunction("reloadPreviewPages", ui_identifier,
    506                                    ui_preview_request_id);
    507 }
    508 
    509 void PrintPreviewUI::OnPreviewDataIsAvailable(int expected_pages_count,
    510                                               int preview_request_id) {
    511   VLOG(1) << "Print preview request finished with "
    512           << expected_pages_count << " pages";
    513 
    514   if (!initial_preview_start_time_.is_null()) {
    515     UMA_HISTOGRAM_TIMES("PrintPreview.InitialDisplayTime",
    516                         base::TimeTicks::Now() - initial_preview_start_time_);
    517     UMA_HISTOGRAM_COUNTS("PrintPreview.PageCount.Initial",
    518                          expected_pages_count);
    519     initial_preview_start_time_ = base::TimeTicks();
    520   }
    521   base::FundamentalValue ui_identifier(id_);
    522   base::FundamentalValue ui_preview_request_id(preview_request_id);
    523   web_ui()->CallJavascriptFunction("updatePrintPreview", ui_identifier,
    524                                    ui_preview_request_id);
    525 }
    526 
    527 void PrintPreviewUI::OnPrintPreviewDialogDestroyed() {
    528   handler_->OnPrintPreviewDialogDestroyed();
    529 }
    530 
    531 void PrintPreviewUI::OnFileSelectionCancelled() {
    532   web_ui()->CallJavascriptFunction("fileSelectionCancelled");
    533 }
    534 
    535 void PrintPreviewUI::OnCancelPendingPreviewRequest() {
    536   g_print_preview_request_id_map.Get().Set(id_, -1);
    537 }
    538 
    539 void PrintPreviewUI::OnPrintPreviewFailed() {
    540   handler_->OnPrintPreviewFailed();
    541   web_ui()->CallJavascriptFunction("printPreviewFailed");
    542 }
    543 
    544 void PrintPreviewUI::OnInvalidPrinterSettings() {
    545   web_ui()->CallJavascriptFunction("invalidPrinterSettings");
    546 }
    547 
    548 PrintPreviewDataService* PrintPreviewUI::print_preview_data_service() {
    549   return PrintPreviewDataService::GetInstance();
    550 }
    551 
    552 void PrintPreviewUI::OnHidePreviewDialog() {
    553   WebContents* preview_dialog = web_ui()->GetWebContents();
    554   printing::BackgroundPrintingManager* background_printing_manager =
    555       g_browser_process->background_printing_manager();
    556   if (background_printing_manager->HasPrintPreviewDialog(preview_dialog))
    557     return;
    558 
    559   ConstrainedWebDialogDelegate* delegate = GetConstrainedDelegate();
    560   if (!delegate)
    561     return;
    562   delegate->ReleaseWebContentsOnDialogClose();
    563   background_printing_manager->OwnPrintPreviewDialog(preview_dialog);
    564   OnClosePrintPreviewDialog();
    565 }
    566 
    567 void PrintPreviewUI::OnClosePrintPreviewDialog() {
    568   if (dialog_closed_)
    569     return;
    570   dialog_closed_ = true;
    571   ConstrainedWebDialogDelegate* delegate = GetConstrainedDelegate();
    572   if (!delegate)
    573     return;
    574   delegate->GetWebDialogDelegate()->OnDialogClosed(std::string());
    575   delegate->OnDialogCloseFromWebUI();
    576 }
    577 
    578 void PrintPreviewUI::OnReloadPrintersList() {
    579   web_ui()->CallJavascriptFunction("reloadPrintersList");
    580 }
    581 
    582 void PrintPreviewUI::OnPrintPreviewScalingDisabled() {
    583   web_ui()->CallJavascriptFunction("printScalingDisabledForSourcePDF");
    584 }
    585