Added Header and Footer support using Skia

chrome/browser/printing/printing_message_filter.cc

 // Copyright (c) 2011 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.
 
 #include "chrome/browser/printing/printing_message_filter.h"
 
+#include "base/i18n/time_formatting.h"
 #include "base/process_util.h"
+#include "base/string_number_conversions.h"
+#include "base/time.h"
+#include "base/utf_string_conversions.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/printing/printer_query.h"
 #include "chrome/browser/printing/print_job_manager.h"
 #include "chrome/common/print_messages.h"
 #include "content/common/view_messages.h"
+#include "printing/print_job_constants.h"
+#include "printing/units.h"
+#include "ui/base/text/text_elider.h"
 
 #if defined(OS_CHROMEOS)
 #include <fcntl.h>
 
 #include "base/file_util.h"
 #include "base/lazy_instance.h"
 #include "chrome/browser/printing/print_dialog_cloud.h"
 #else
 #include "base/command_line.h"
 #include "chrome/common/chrome_switches.h"
 #endif
 
+using base::Time;
+using printing::ConvertPointsToPixelDouble;
+using printing::ConvertUnitDouble;
+using printing::GetSegmentWidth;
+using printing::GetDPI;
+
 namespace {
 
 #if defined(OS_CHROMEOS)
 typedef std::map<int, FilePath> SequenceToPathMap;
 
 struct PrintingSequencePathMap {
   SequenceToPathMap map;
   int sequence;
 };
 
@@ skipping 233 matching lines @@
   } else {
     printer_query->StopWorker();
   }
 }
 
 void PrintingMessageFilter::OnUpdatePrintSettings(
     int document_cookie, const DictionaryValue& job_settings,
     IPC::Message* reply_msg) {
   scoped_refptr<printing::PrinterQuery> printer_query;
   print_job_manager_->PopPrinterQuery(document_cookie, &printer_query);
+
+  // Getting Header and Footer settings.
+  if (!job_settings.GetBoolean(printing::kSettingHeaderFooterEnabled,
+                               &display_header_footer_)) {
+    NOTREACHED();
+  }
+
+  if (display_header_footer_) {
+    string16 title;
+    std::string url;
+    if (!job_settings.GetString(printing::kSettingHeaderFooterTitle, &title) ||
+        !job_settings.GetString(printing::kSettingHeaderFooterURL, &url)) {
+      NOTREACHED();
+    }
+    header_footer_info_.reset(new DictionaryValue());
+    header_footer_info_->SetString(printing::kSettingHeaderFooterURL, url);
+    header_footer_info_->SetString(printing::kSettingHeaderFooterTitle, title);
+  }
+
   if (printer_query.get()) {
     CancelableTask* task = NewRunnableMethod(
         this,
         &PrintingMessageFilter::OnUpdatePrintSettingsReply,
         printer_query,
         reply_msg);
     printer_query->SetSettings(job_settings, task);
   }
 }
 
+void UpdateHeaderFooterStrings(const base::DictionaryValue& header_footer_info,

[vandebo (ex-Chrome), 2011/08/11 23:32:13]

What process adds the strings to params?  Can the ElideText calls be done there?

[Aayush Kumar, 2011/08/12 08:35:40]

As discussed, this is the browser process. :)

+                               PrintMsg_PrintPages_Params* params) {
+  string16 date = base::TimeFormatShortDateNumeric(Time::Now());
+  string16 title;
+  std::string url;
+  if (!header_footer_info.GetString(printing::kSettingHeaderFooterTitle,
+                                    &title) ||
+      !header_footer_info.GetString(printing::kSettingHeaderFooterURL,
+                                    &url)) {
+    NOTREACHED();
+  }
+
+  gfx::Font font(UTF8ToUTF16(printing::kSettingHeaderFooterFontName),
+                 ceil(ConvertPointsToPixelDouble(
+                     printing::kSettingHeaderFooterFontSize)));
+  double segment_width = GetSegmentWidth(ConvertUnitDouble(
+      params->params.page_size.width(), GetDPI(&params->params),
+      printing::kPixelsPerInch));
+  params->params.date = ui::ElideText(date, font, segment_width, false);
+
+  // Calculate the available title width. If the date string is not long
+  // enough, increase the available space for the title.
+  // Assumes there is no header text to RIGHT of title.
+  double date_width = font.GetStringWidth(date);
+  SkScalar max_title_width = std::min(2 * segment_width,
+                                      2 * (segment_width - date_width) +
+                                          segment_width);
+  params->params.title = ui::ElideText(title, font, max_title_width, false);
+
+  double max_url_width = 2 * segment_width;
+  GURL gurl(url);
+  params->params.url = ui::ElideUrl(gurl, font, max_url_width, std::string());
+}
+
 void PrintingMessageFilter::OnUpdatePrintSettingsReply(
     scoped_refptr<printing::PrinterQuery> printer_query,
     IPC::Message* reply_msg) {
   PrintMsg_PrintPages_Params params;
   if (printer_query->last_status() != printing::PrintingContext::OK) {
     memset(&params, 0, sizeof(params));
   } else {
     RenderParamsFromPrintSettings(printer_query->settings(), &params.params);
     params.params.document_cookie = printer_query->cookie();
     params.pages =
         printing::PageRange::GetPages(printer_query->settings().ranges);
+
+    if (display_header_footer_)
+      UpdateHeaderFooterStrings(*header_footer_info_, &params);
   }
   PrintHostMsg_UpdatePrintSettings::WriteReplyParams(reply_msg, params);
   Send(reply_msg);
   // If user hasn't cancelled.
   if (printer_query->cookie() && printer_query->settings().dpi())
     print_job_manager_->QueuePrinterQuery(printer_query.get());
   else
     printer_query->StopWorker();
 }