Implement DocuementHasImages

android_webview/browser/renderer_host/aw_render_view_host_ext.h

+// 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.
+
+#ifndef ANDROID_WEBVIEW_BROWSER_RENDER_HOST_RENDER_VIEW_HOST_EXT_H_
+#define ANDROID_WEBVIEW_BROWSER_RENDER_HOST_RENDER_VIEW_HOST_EXT_H_
+
+#include "content/public/browser/web_contents_observer.h"
+
+#include "base/threading/non_thread_safe.h"
+
+namespace android_webview {
+
+// Provides RenderViewHost wrapper functionality for sending WebView-specific
+// IPC messages to the renderer and from there to WebKit.
+class AwRenderViewHostExt : public content::WebContentsObserver,
+                            public base::NonThreadSafe {
+ public:
+  // To send receive messages to a RenderView we take the WebContents instance,
+  // as it internally handles RenderViewHost instances changing underneath us.
+  AwRenderViewHostExt(content::WebContents* contents);
+  virtual ~AwRenderViewHostExt();
+
+  // |result| will be invoked with the outcome of the request.
+  typedef base::Callback<void(bool)> DocumentHasImagesResult;
+  void DocumentHasImages(DocumentHasImagesResult result);
+
+ private:
+  // content::WebContentsObserver implementation.
+  virtual void RenderViewGone(base::TerminationStatus status) OVERRIDE;
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
+
+  void OnDocumentHasImagesResponse(int msg_id, bool has_images);
+
+  std::map<int, DocumentHasImagesResult> pending_document_has_images_requests_;
+
+  DISALLOW_COPY_AND_ASSIGN(AwRenderViewHostExt);
+};
+
+}  // namespace android_webview
+
+#endif  // ANDROID_WEBVIEW_BROWSER_RENDER_HOST_RENDER_VIEW_HOST_EXT_H_