Delegates for the printing component

chrome/renderer/printing/print_web_view_helper.cc

 // Copyright (c) 2012 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/printing/print_web_view_helper.h"
 
 #include <string>
 
 #include "base/auto_reset.h"
-#include "base/command_line.h"
 #include "base/json/json_writer.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/metrics/histogram.h"
 #include "base/process/process_handle.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
-#include "chrome/common/chrome_switches.h"
 #include "chrome/common/print_messages.h"
-#include "chrome/common/render_messages.h"
 #include "chrome/grit/browser_resources.h"
-#include "chrome/renderer/prerender/prerender_helper.h"
 #include "content/public/common/web_preferences.h"
 #include "content/public/renderer/render_frame.h"
 #include "content/public/renderer/render_thread.h"
 #include "content/public/renderer/render_view.h"
 #include "net/base/escape.h"
 #include "printing/pdf_metafile_skia.h"
 #include "printing/units.h"
 #include "third_party/WebKit/public/platform/WebSize.h"
 #include "third_party/WebKit/public/platform/WebURLRequest.h"
 #include "third_party/WebKit/public/web/WebConsoleMessage.h"
 #include "third_party/WebKit/public/web/WebDocument.h"
 #include "third_party/WebKit/public/web/WebElement.h"
 #include "third_party/WebKit/public/web/WebFrameClient.h"
 #include "third_party/WebKit/public/web/WebLocalFrame.h"
 #include "third_party/WebKit/public/web/WebPlugin.h"
 #include "third_party/WebKit/public/web/WebPluginDocument.h"
 #include "third_party/WebKit/public/web/WebPrintParams.h"
 #include "third_party/WebKit/public/web/WebPrintPresetOptions.h"
 #include "third_party/WebKit/public/web/WebPrintScalingOption.h"
 #include "third_party/WebKit/public/web/WebScriptSource.h"
 #include "third_party/WebKit/public/web/WebSettings.h"
 #include "third_party/WebKit/public/web/WebView.h"
 #include "third_party/WebKit/public/web/WebViewClient.h"
 #include "ui/base/resource/resource_bundle.h"
 
 #if defined(ENABLE_EXTENSIONS)
-#include "chrome/common/extensions/extension_constants.h"
 #include "extensions/common/constants.h"
 #endif  // defined(ENABLE_EXTENSIONS)
 
 using content::WebPreferences;
 
 namespace printing {
 
 namespace {
 
 enum PrintPreviewHelperEvents {
@@ skipping 343 matching lines @@
 
   if (fit_to_page) {
     double factor = FitPrintParamsToPage(params, &result_params);
     if (scale_factor)
       *scale_factor = factor;
   }
   return result_params;
 }
 
 // Return the PDF object element if |frame| is the out of process PDF extension.
-blink::WebElement GetPdfElement(blink::WebLocalFrame* frame) {
+blink::WebElement GetPdfElement(blink::WebLocalFrame* frame,
+                                const char* pdf_extension_id) {

[dgn, 2015/01/06 16:35:31]

Would it be better to make this function a method of PrintWebViewHelper instead,
to avoid passing |pdf_extension_id|?

[Vitaly Buka (NO REVIEWS), 2015/01/06 19:29:24]

It's fine to keep as is

On 2015/01/06 16:35:31, dgn wrote:
please use const std::string& if you don'e have rely important reasons to not to
do so.

[dgn, 2015/01/06 21:01:45]

Done.

 #if defined(ENABLE_EXTENSIONS)
   GURL url = frame->document().url();
   if (url.SchemeIs(extensions::kExtensionScheme) &&
-      url.host() == extension_misc::kPdfExtensionId) {
+      url.host() == pdf_extension_id) {
     // <object> with id="plugin" is created in
     // chrome/browser/resources/pdf/pdf.js.
     auto plugin_element = frame->document().getElementById("plugin");
     if (!plugin_element.isNull()) {
       return plugin_element;
     }
     NOTREACHED();
   }
 #endif  // defined(ENABLE_EXTENSIONS)
   return blink::WebElement();
@@ skipping 343 matching lines @@
     if (owns_web_view_) {
       DCHECK(!frame->isLoading());
       owns_web_view_ = false;
       web_view->close();
     }
   }
   frame_.Reset(NULL);
   on_ready_.Reset();
 }
 
-PrintWebViewHelper::PrintWebViewHelper(content::RenderView* render_view)
+PrintWebViewHelper::PrintWebViewHelper(
+    content::RenderView* render_view,
+    bool out_of_process_pdf_enabled,
+    bool print_preview_disabled,
+    const char* pdf_extension_id,
+    scoped_ptr<Delegate> delegate)
     : content::RenderViewObserver(render_view),
       content::RenderViewObserverTracker<PrintWebViewHelper>(render_view),
       reset_prep_frame_view_(false),
       is_print_ready_metafile_sent_(false),
       ignore_css_margins_(false),
       is_scripted_printing_blocked_(false),
       notify_browser_of_print_failure_(true),
       print_for_preview_(false),
+      out_of_process_pdf_enabled_(out_of_process_pdf_enabled),
+      pdf_extension_id_(pdf_extension_id),
+      delegate_(delegate.Pass()),
       print_node_in_progress_(false),
       is_loading_(false),
       is_scripted_preview_delayed_(false),
       weak_ptr_factory_(this) {
-  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kDisablePrintPreview)) {
+  if (print_preview_disabled)
     DisablePreview();
-  }
 }
 
 PrintWebViewHelper::~PrintWebViewHelper() {}
 
 // static
 void PrintWebViewHelper::DisablePreview() {
   g_is_preview_enabled_ = false;
 }
 
 bool PrintWebViewHelper::IsScriptInitiatedPrintAllowed(
@@ skipping 18 matching lines @@
     on_stop_loading_closure_.Reset();
   }
 }
 
 // Prints |frame| which called window.print().
 void PrintWebViewHelper::PrintPage(blink::WebLocalFrame* frame,
                                    bool user_initiated) {
   DCHECK(frame);
 
   // Allow Prerendering to cancel this print request if necessary.
-  if (prerender::PrerenderHelper::IsPrerendering(
-          render_view()->GetMainRenderFrame())) {
-    Send(new ChromeViewHostMsg_CancelPrerenderForPrinting(routing_id()));
+  if (delegate_->CancelPrerender(render_view(), routing_id()))
     return;
-  }
 
   if (!IsScriptInitiatedPrintAllowed(frame, user_initiated))
     return;
 
   if (!g_is_preview_enabled_) {
     Print(frame, blink::WebNode(), true);
   } else {
     print_preview_context_.InitWithFrame(frame);
     RequestPrintPreview(PRINT_PREVIEW_SCRIPTED);
   }
@@ skipping 36 matching lines @@
   if (pdf_element.isNull()) {
     NOTREACHED();
     return;
   }
 
   // The out-of-process plugin element is nested within a frame. In tests, there
   // may not be an iframe containing the out-of-process plugin, so continue with
   // the element with ID "pdf-viewer" if it isn't an iframe.
   blink::WebLocalFrame* plugin_frame = pdf_element.document().frame();
   blink::WebElement plugin_element = pdf_element;
-  if (switches::OutOfProcessPdfEnabled() &&
-      pdf_element.hasHTMLTagName("iframe")) {
+  if (out_of_process_pdf_enabled_ && pdf_element.hasHTMLTagName("iframe")) {
     plugin_frame = blink::WebLocalFrame::fromFrameOwnerElement(pdf_element);
-    plugin_element = GetPdfElement(plugin_frame);
+    plugin_element = GetPdfElement(plugin_frame, pdf_extension_id_);
     if (plugin_element.isNull()) {
       NOTREACHED();
       return;
     }
   }
 
   // Set |print_for_preview_| flag and autoreset it to back to original
   // on return.
   base::AutoReset<bool> set_printing_flag(&print_for_preview_, true);
 
@@ skipping 39 matching lines @@
   return true;
 }
 
 #if defined(ENABLE_BASIC_PRINTING)
 void PrintWebViewHelper::OnPrintPages() {
   blink::WebLocalFrame* frame;
   if (!GetPrintFrame(&frame))
     return;
   // If we are printing a PDF extension frame, find the plugin node and print
   // that instead.
-  auto plugin = GetPdfElement(frame);
+  auto plugin = GetPdfElement(frame, pdf_extension_id_);
   Print(frame, plugin, false);
 }
 
 void PrintWebViewHelper::OnPrintForSystemDialog() {
   blink::WebLocalFrame* frame = print_preview_context_.source_frame();
   if (!frame) {
     NOTREACHED();
     return;
   }
   Print(frame, print_preview_context_.source_node(), false);
@@ skipping 234 matching lines @@
 void PrintWebViewHelper::SetScriptedPrintBlocked(bool blocked) {
   is_scripted_printing_blocked_ = blocked;
 }
 
 void PrintWebViewHelper::OnInitiatePrintPreview(bool selection_only) {
   blink::WebLocalFrame* frame = NULL;
   GetPrintFrame(&frame);
   DCHECK(frame);
   // If we are printing a PDF extension frame, find the plugin node and print
   // that instead.
-  auto plugin = GetPdfElement(frame);
+  auto plugin = GetPdfElement(frame, pdf_extension_id_);
   if (!plugin.isNull()) {
     PrintNode(plugin);
     return;
   }
   print_preview_context_.InitWithFrame(frame);
   RequestPrintPreview(selection_only ?
                       PRINT_PREVIEW_USER_INITIATED_SELECTION :
                       PRINT_PREVIEW_USER_INITIATED_ENTIRE_FRAME);
 }
 
@@ skipping 817 matching lines @@
       blink::WebConsoleMessage::LevelWarning, message));
   return false;
 }
 
 void PrintWebViewHelper::ScriptingThrottler::Reset() {
   // Reset counter on successful print.
   count_ = 0;
 }
 
 }  // namespace printing