Initial support for cloudprint in print preview

chrome/renderer/print_web_view_helper.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/renderer/print_web_view_helper.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/process_util.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/print_messages.h"
 #include "chrome/common/render_messages.h"
+#include "chrome/common/url_constants.h"
 #include "chrome/renderer/prerender/prerender_helper.h"
 #include "content/renderer/render_view.h"
 #include "grit/generated_resources.h"
 #include "printing/metafile.h"
+#include "printing/print_job_constants.h"
 #include "printing/units.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebConsoleMessage.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebDataSource.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebDocument.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebElement.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebNode.h"
-#include "third_party/WebKit/Source/WebKit/chromium/public/WebURLResponse.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebSize.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebURLRequest.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebURLResponse.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebView.h"
 #include "ui/base/l10n/l10n_util.h"
 
 #if defined(OS_POSIX)
 #include "content/common/view_messages.h"
 #endif
 
 using printing::ConvertPixelsToPoint;
 using printing::ConvertPixelsToPointDouble;
 using printing::ConvertUnit;
 using printing::ConvertUnitDouble;
 using WebKit::WebConsoleMessage;
 using WebKit::WebDocument;
 using WebKit::WebElement;
 using WebKit::WebFrame;
 using WebKit::WebNode;
 using WebKit::WebSize;
 using WebKit::WebString;
 using WebKit::WebURLRequest;
 using WebKit::WebView;
 
 namespace {
 
+const double kMinDpi = 1.0;
+
 int GetDPI(const PrintMsg_Print_Params* print_params) {
 #if defined(OS_MACOSX)
   // On the Mac, the printable area is in points, don't do any scaling based
   // on dpi.
   return printing::kPointsPerInch;
 #else
   return static_cast<int>(print_params->dpi);
 #endif  // defined(OS_MACOSX)
 }
 
@@ skipping 550 matching lines @@
   params->margin_top = static_cast<int>(ConvertUnitDouble(
       margin_top_in_points, printing::kPointsPerInch, dpi));
   params->margin_left = static_cast<int>(ConvertUnitDouble(
       margin_left_in_points, printing::kPointsPerInch, dpi));
 }
 
 bool PrintWebViewHelper::InitPrintSettings(WebKit::WebFrame* frame,
                                            WebKit::WebNode* node) {
   PrintMsg_PrintPages_Params settings;
 
+  // TODO(abodenha@chromium.org) It doesn't make sense to do this if our
+  // "default" is a cloud based printer.  Split InitPrintSettings up
+  // so that we can avoid the overhead of unneeded calls into the native
+  // print system.
   Send(new PrintHostMsg_GetDefaultPrintSettings(routing_id(),
                                                 &settings.params));
   // Check if the printer returned any settings, if the settings is empty, we
   // can safely assume there are no printer drivers configured. So we safely
   // terminate.
   if (PrintMsg_Print_Params_IsEmpty(settings.params)) {
     render_view()->runModalAlertDialog(
         frame,
         l10n_util::GetStringUTF16(IDS_DEFAULT_PRINTER_NOT_FOUND_WARNING));
     return false;
   }
-  if (!settings.params.dpi || !settings.params.document_cookie) {
+  if (settings.params.dpi < kMinDpi || settings.params.document_cookie == 0) {
     // Invalid print page settings.
     NOTREACHED();
     return false;
   }
   UpdatePrintableSizeInPrintParameters(frame, node, &settings.params);
   settings.pages.clear();
   print_pages_params_.reset(new PrintMsg_PrintPages_Params(settings));
   Send(new PrintHostMsg_DidGetDocumentCookie(routing_id(),
                                              settings.params.document_cookie));
   return true;
 }
 
-bool PrintWebViewHelper::UpdatePrintSettings(
+bool PrintWebViewHelper::UpdatePrintSettingsCloud(
+    const DictionaryValue& job_settings) {
+  // Document cookie and pages are set by the
+  // PrintHostMsg_UpdatePrintSettings message above.
+  // TODO(abodenha@chromium.org) These numbers are for a letter sized
+  // page at 300dpi and half inch margins.
+  // Pull them from printer caps instead.
+  PrintMsg_PrintPages_Params settings;
+  settings.params.page_size = gfx::Size(2550, 3300);
+  settings.params.printable_size = gfx::Size(2250, 3000);
+  settings.params.margin_top = 150;
+  settings.params.margin_left = 150;
+  settings.params.dpi = 300.0;
+  settings.params.min_shrink = 1.25;
+  settings.params.max_shrink = 2.0;
+  settings.params.desired_dpi = 72;
+  settings.params.selection_only = false;
+  settings.params.supports_alpha_blend = false;
+  // TODO(abodenha@chromium.org) Parse page ranges from the job_settings.
+  print_pages_params_.reset(new PrintMsg_PrintPages_Params(settings));
+  return true;
+}
+
+bool PrintWebViewHelper::UpdatePrintSettingsLocal(
     const DictionaryValue& job_settings) {
   PrintMsg_PrintPages_Params settings;
+
   Send(new PrintHostMsg_UpdatePrintSettings(routing_id(),
       print_pages_params_->params.document_cookie, job_settings, &settings));
 
-  if (!settings.params.dpi || !settings.params.document_cookie)
+  if (settings.params.dpi < kMinDpi || !settings.params.document_cookie)
     return false;
 
   print_pages_params_.reset(new PrintMsg_PrintPages_Params(settings));
   Send(new PrintHostMsg_DidGetDocumentCookie(routing_id(),
                                              settings.params.document_cookie));
   return true;
 }
 
+bool PrintWebViewHelper::UpdatePrintSettings(
+    const DictionaryValue& job_settings) {
+  if (job_settings.HasKey(printing::kSettingCloudPrintId)) {
+    return UpdatePrintSettingsCloud(job_settings);
+  } else {
+    return UpdatePrintSettingsLocal(job_settings);
+  }
+}
+
 bool PrintWebViewHelper::GetPrintSettingsFromUser(WebKit::WebFrame* frame,
                                                   int expected_pages_count,
                                                   bool use_browser_overlays) {
   PrintHostMsg_ScriptedPrint_Params params;
   PrintMsg_PrintPages_Params print_settings;
 
   // The routing id is sent across as it is needed to look up the
   // corresponding RenderViewHost instance to signal and reset the
   // pump messages event.
   params.routing_id = render_view()->routing_id();
@@ skipping 142 matching lines @@
   Send(new PrintHostMsg_RequestPrintPreview(routing_id()));
 }
 
 bool PrintWebViewHelper::PreviewPageRendered(int page_number) {
   bool cancel = false;
   Send(new PrintHostMsg_DidPreviewPage(routing_id(), page_number, &cancel));
   if (cancel)
     notify_browser_of_print_failure_ = false;
   return !cancel;
 }