Delegates for the printing component

chrome/renderer/printing/print_web_view_helper_delegate.h

+// Copyright (c) 2014 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.
+
+#ifndef COMPONENTS_PRINTING_PRINT_WEB_VIEW_HELPER_DELEGATE_H_
+#define COMPONENTS_PRINTING_PRINT_WEB_VIEW_HELPER_DELEGATE_H_
+
+#include "third_party/WebKit/public/web/WebElement.h"
+
+namespace blink {
+class WebLocalFrame;
+}
+
+namespace base {
+class StringValue;
+}
+
+namespace content {
+class RenderView;
+}
+
+namespace IPC {
+class Message;
+}
+
+namespace printing {
+
+class PrintWebViewHelperDelegate {

[Vitaly Buka (NO REVIEWS), 2015/01/05 19:57:03]

it's a trivial interface
Could we make it a nested class?

class PrintWebViewHelper {
  class Delegate {
  }
}

[dgn, 2015/01/05 22:45:47]

Done.

+ public:
+  virtual ~PrintWebViewHelperDelegate() {}
+
+  virtual bool OutOfProcessPdfEnabled();
+
+  // Returns the element to be printed. Returns a new WebElement if
+  // a pdf plugin element can't be extracted from the frame.
+  virtual blink::WebElement GetPdfElement(blink::WebLocalFrame* frame) = 0;
+
+  // Returns the preview page
+  virtual base::StringValue GetPrintPreviewHtml() = 0;
+
+  // Returns whether print preview should be disabled
+  virtual bool PrintPreviewDisabled() = 0;
+
+  // If a scripted print needs to be cancelled, returns a message to be sent
+  // before cancelling print. Else returns |nullptr|.
+  virtual IPC::Message* GetScriptedPrintCancelMessage(
+          content::RenderView* render_view,
+          int render_id) = 0;
+};  // class PrintWebViewHelperDelegate
+
+}  // namespace printing
+
+#endif  // COMPONENTS_PRINTING_PRINT_WEB_VIEW_HELPER_DELEGATE_H_