Implement History as HTML and add/change a bunch of stuff to make it easier t...

chrome/browser/dom_ui/dom_ui_contents.h

+// Copyright (c) 2006-2008 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.
+
+// Contains code for managing local HTML UI at chrome:// URLs.
+
+#ifndef CHROME_BROWSER_DOM_UI_CONTENTS_H__
+#define CHROME_BROWSER_DOM_UI_CONTENTS_H__
+
+#include "chrome/browser/dom_ui/chrome_url_data_manager.h"
+#include "chrome/browser/web_contents.h"
+#include "webkit/glue/webpreferences.h"
+
+class DOMUI;
+class render_view_host;
+
+// FavIconSource is the gateway between network-level chrome:
+// requests for favicons and the history backend that serves these.
+class FavIconSource : public ChromeURLDataManager::DataSource {
+ public:
+  explicit FavIconSource(Profile* profile);
+
+  // Called when the network layer has requested a resource underneath
+  // the path we registered.
+  virtual void StartDataRequest(const std::string& path, int request_id);
+
+  virtual std::string GetMimeType(const std::string&) const {
+    // Rely on image decoder inferring the correct type.
+    return std::string();
+  }
+
+  // Called when favicon data is available from the history backend.
+  void OnFavIconDataAvailable(
+      HistoryService::Handle request_handle,
+      bool know_favicon,
+      scoped_refptr<RefCountedBytes> data,
+      bool expired,
+      GURL url);
+
+ private:
+  Profile* const profile_;
+  CancelableRequestConsumerT<int, 0> cancelable_consumer_;
+
+  // Raw PNG representation of the favicon to show when the favicon
+  // database doesn't have a favicon for a webpage.
+  scoped_refptr<RefCountedBytes> default_favicon_;
+
+  DISALLOW_COPY_AND_ASSIGN(FavIconSource);
+};
+
+// ThumbnailSource is the gateway between network-level chrome:
+// requests for thumbnails and the history backend that serves these.
+class ThumbnailSource : public ChromeURLDataManager::DataSource {
+ public:
+  explicit ThumbnailSource(Profile* profile);
+
+  // Called when the network layer has requested a resource underneath
+  // the path we registered.
+  virtual void StartDataRequest(const std::string& path, int request_id);
+
+  virtual std::string GetMimeType(const std::string&) const {
+    // Rely on image decoder inferring the correct type.
+    return std::string();
+  }
+
+  // Called when thumbnail data is available from the history backend.
+  void OnThumbnailDataAvailable(
+      HistoryService::Handle request_handle,
+      scoped_refptr<RefCountedBytes> data);
+
+ private:
+  Profile* const profile_;
+  CancelableRequestConsumerT<int, 0> cancelable_consumer_;
+
+  // Raw PNG representation of the thumbnail to show when the thumbnail
+  // database doesn't have a thumbnail for a webpage.
+  scoped_refptr<RefCountedBytes> default_thumbnail_;
+
+  DISALLOW_COPY_AND_ASSIGN(ThumbnailSource);
+};
+
+// Exposed for use by BrowserURLHandler.
+bool DOMUIContentsCanHandleURL(GURL* url, TabContentsType* result_type);
+
+class DOMUIContents : public WebContents {
+ public:
+  DOMUIContents(Profile* profile,
+                SiteInstance* instance,
+                RenderViewHostFactory* render_view_factory);
+  ~DOMUIContents();
+
+  //
+  // WebContents overrides
+  //
+  virtual void ProcessDOMUIMessage(const std::string& message,
+                                   const std::string& content);
+  virtual bool CreateRenderViewForRenderManager(
+      RenderViewHost* render_view_host);
+  // Override this method so we can ensure that javascript and image loading
+  // are always on even for DOMUIHost tabs.
+  virtual WebPreferences GetWebkitPrefs();
+
+  //
+  // TabContents overrides
+  // 
+  virtual void UpdateHistoryForNavigation(const GURL& url,
+      const ViewHostMsg_FrameNavigate_Params& params) { }
+  virtual bool NavigateToPendingEntry(bool reload);
+
+  // Return the scheme used. We currently use chrome:
+  static const std::string GetScheme();
+
+ private:
+  // Return a DOM UI for the provided URL.
+  DOMUI* GetDOMUIForURL(const GURL& url);
+
+  // The DOMUI we own and show.
+  DOMUI* current_ui_;
+
+  DISALLOW_COPY_AND_ASSIGN(DOMUIContents);
+};
+
+#endif  // CHROME_BROWSER_DOM_UI_CONTENTS_H__