1 // Copyright 2015 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 "libcef/renderer/extensions/print_render_frame_helper_delegate.h" 6 7 #include <vector> 8 9 #include "libcef/common/extensions/extensions_util.h" 10 11 #include "base/command_line.h" 12 #include "base/strings/string_util.h" 13 #include "chrome/common/chrome_switches.h" 14 #include "chrome/common/extensions/extension_constants.h" 15 #include "chrome/common/url_constants.h" 16 #include "content/public/renderer/render_frame.h" 17 #include "extensions/common/constants.h" 18 #include "extensions/renderer/guest_view/mime_handler_view/post_message_support.h" 19 #include "services/service_manager/public/cpp/interface_provider.h" 20 #include "third_party/blink/public/web/web_document.h" 21 #include "third_party/blink/public/web/web_element.h" 22 #include "third_party/blink/public/web/web_local_frame.h" 23 24 namespace extensions { 25 CefPrintRenderFrameHelperDelegate(bool is_windowless)26CefPrintRenderFrameHelperDelegate::CefPrintRenderFrameHelperDelegate( 27 bool is_windowless) 28 : is_windowless_(is_windowless) {} 29 ~CefPrintRenderFrameHelperDelegate()30CefPrintRenderFrameHelperDelegate::~CefPrintRenderFrameHelperDelegate() {} 31 32 // Return the PDF object element if |frame| is the out of process PDF extension. GetPdfElement(blink::WebLocalFrame * frame)33blink::WebElement CefPrintRenderFrameHelperDelegate::GetPdfElement( 34 blink::WebLocalFrame* frame) { 35 GURL url = frame->GetDocument().Url(); 36 bool inside_print_preview = url.GetOrigin() == chrome::kChromeUIPrintURL; 37 bool inside_pdf_extension = 38 url.SchemeIs(extensions::kExtensionScheme) && 39 url.host_piece() == extension_misc::kPdfExtensionId; 40 if (inside_print_preview || inside_pdf_extension) { 41 // <object> with id="plugin" is created in 42 // chrome/browser/resources/pdf/pdf_viewer_base.js. 43 auto viewer_element = frame->GetDocument().GetElementById("viewer"); 44 if (!viewer_element.IsNull() && !viewer_element.ShadowRoot().IsNull()) { 45 auto plugin_element = 46 viewer_element.ShadowRoot().QuerySelector("#plugin"); 47 if (!plugin_element.IsNull()) { 48 return plugin_element; 49 } 50 } 51 NOTREACHED(); 52 } 53 return blink::WebElement(); 54 } 55 IsPrintPreviewEnabled()56bool CefPrintRenderFrameHelperDelegate::IsPrintPreviewEnabled() { 57 return !is_windowless_ && PrintPreviewEnabled(); 58 } 59 OverridePrint(blink::WebLocalFrame * frame)60bool CefPrintRenderFrameHelperDelegate::OverridePrint( 61 blink::WebLocalFrame* frame) { 62 auto* post_message_support = 63 extensions::PostMessageSupport::FromWebLocalFrame(frame); 64 if (post_message_support) { 65 // This message is handled in chrome/browser/resources/pdf/pdf.js and 66 // instructs the PDF plugin to print. This is to make window.print() on a 67 // PDF plugin document correctly print the PDF. See 68 // https://crbug.com/448720. 69 base::DictionaryValue message; 70 message.SetString("type", "print"); 71 post_message_support->PostMessageFromValue(message); 72 return true; 73 } 74 return false; 75 } 76 77 } // namespace extensions 78