components/plugins/renderer/webview_plugin.h

   1 // Copyright 2013 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 #ifndef COMPONENTS_PLUGINS_RENDERER_WEBVIEW_PLUGIN_H_
   6 #define COMPONENTS_PLUGINS_RENDERER_WEBVIEW_PLUGIN_H_
   7
   8 #include <list>
   9
  10 #include "base/memory/scoped_ptr.h"
  11 #include "base/sequenced_task_runner_helpers.h"
  12 #include "third_party/WebKit/public/platform/WebCursorInfo.h"
  13 #include "third_party/WebKit/public/platform/WebString.h"
  14 #include "third_party/WebKit/public/platform/WebURLResponse.h"
  15 #include "third_party/WebKit/public/web/WebFrameClient.h"
  16 #include "third_party/WebKit/public/web/WebPlugin.h"
  17 #include "third_party/WebKit/public/web/WebViewClient.h"
  18
  19 namespace blink {
  20 class WebMouseEvent;
  21 }
  22
  23 namespace content {
  24 class RenderView;
  25 struct WebPreferences;
  26 }
  27
  28 // This class implements the WebPlugin interface by forwarding drawing and
  29 // handling input events to a WebView.
  30 // It can be used as a placeholder for an actual plugin, using HTML for the UI.
  31 // To show HTML data inside the WebViewPlugin,
  32 // call web_view->mainFrame()->loadHTMLString() with the HTML data and a fake
  33 // chrome:// URL as origin.
  34
  35 class WebViewPlugin : public blink::WebPlugin,
  36                       public blink::WebViewClient,
  37                       public blink::WebFrameClient {
  38  public:
  39   class Delegate {
  40    public:
  41     // Bind |frame| to a Javascript object, enabling the delegate to receive
  42     // callback methods from Javascript inside the WebFrame.
  43     // This method is called from WebFrameClient::didClearWindowObject.
  44     virtual void BindWebFrame(blink::WebFrame* frame) = 0;
  45
  46     // Called upon a context menu event.
  47     virtual void ShowContextMenu(const blink::WebMouseEvent&) = 0;
  48
  49     // Called when the WebViewPlugin is destroyed.
  50     virtual void PluginDestroyed() = 0;
  51   };
  52
  53   // Convenience method to set up a new WebViewPlugin using |preferences|
  54   // and displaying |html_data|. |url| should be a (fake) chrome:// URL; it is
  55   // only used for navigation and never actually resolved.
  56   static WebViewPlugin* Create(Delegate* delegate,
  57                                const content::WebPreferences& preferences,
  58                                const std::string& html_data,
  59                                const GURL& url);
  60
  61   blink::WebView* web_view() { return web_view_; }
  62
  63   // When loading a plug-in document (i.e. a full page plug-in not embedded in
  64   // another page), we save all data that has been received, and replay it with
  65   // this method on the actual plug-in.
  66   void ReplayReceivedData(blink::WebPlugin* plugin);
  67
  68   void RestoreTitleText();
  69
  70   // WebPlugin methods:
  71   virtual blink::WebPluginContainer* container() const;
  72   virtual bool initialize(blink::WebPluginContainer*);
  73   virtual void destroy();
  74
  75   virtual NPObject* scriptableObject();
  76   virtual struct _NPP* pluginNPP();
  77
  78   virtual bool getFormValue(blink::WebString& value);
  79
  80   virtual void paint(blink::WebCanvas* canvas, const blink::WebRect& rect);
  81
  82   // Coordinates are relative to the containing window.
  83   virtual void updateGeometry(
  84       const blink::WebRect& frame_rect,
  85       const blink::WebRect& clip_rect,
  86       const blink::WebVector<blink::WebRect>& cut_out_rects,
  87       bool is_visible);
  88
  89   virtual void updateFocus(bool);
  90   virtual void updateVisibility(bool) {}
  91
  92   virtual bool acceptsInputEvents();
  93   virtual bool handleInputEvent(const blink::WebInputEvent& event,
  94                                 blink::WebCursorInfo& cursor_info);
  95
  96   virtual void didReceiveResponse(const blink::WebURLResponse& response);
  97   virtual void didReceiveData(const char* data, int data_length);
  98   virtual void didFinishLoading();
  99   virtual void didFailLoading(const blink::WebURLError& error);
 100
 101   // Called in response to WebPluginContainer::loadFrameRequest
 102   virtual void didFinishLoadingFrameRequest(const blink::WebURL& url,
 103                                             void* notifyData) {}
 104   virtual void didFailLoadingFrameRequest(const blink::WebURL& url,
 105                                           void* notify_data,
 106                                           const blink::WebURLError& error) {}
 107
 108   // WebViewClient methods:
 109   virtual bool acceptsLoadDrops();
 110
 111   virtual void setToolTipText(const blink::WebString&,
 112                               blink::WebTextDirection);
 113
 114   virtual void startDragging(blink::WebLocalFrame* frame,
 115                              const blink::WebDragData& drag_data,
 116                              blink::WebDragOperationsMask mask,
 117                              const blink::WebImage& image,
 118                              const blink::WebPoint& point);
 119
 120   // TODO(ojan): Remove this override and have this class use a non-null
 121   // layerTreeView.
 122   virtual bool allowsBrokenNullLayerTreeView() const;
 123
 124   // WebWidgetClient methods:
 125   virtual void didInvalidateRect(const blink::WebRect&);
 126   virtual void didChangeCursor(const blink::WebCursorInfo& cursor);
 127
 128   // WebFrameClient methods:
 129   virtual void didClearWindowObject(blink::WebLocalFrame* frame);
 130
 131   // This method is defined in WebPlugin as well as in WebFrameClient, but with
 132   // different parameters. We only care about implementing the WebPlugin
 133   // version, so we implement this method and call the default in WebFrameClient
 134   // (which does nothing) to correctly overload it.
 135   virtual void didReceiveResponse(blink::WebLocalFrame* frame,
 136                                   unsigned identifier,
 137                                   const blink::WebURLResponse& response);
 138
 139  private:
 140   friend class base::DeleteHelper<WebViewPlugin>;
 141   WebViewPlugin(Delegate* delegate, const content::WebPreferences& preferences);
 142   virtual ~WebViewPlugin();
 143
 144   // Manages its own lifetime.
 145   Delegate* delegate_;
 146
 147   blink::WebCursorInfo current_cursor_;
 148
 149   // Owns us.
 150   blink::WebPluginContainer* container_;
 151
 152   // Owned by us, deleted via |close()|.
 153   blink::WebView* web_view_;
 154
 155   // Owned by us, deleted via |close()|.
 156   blink::WebFrame* web_frame_;
 157   gfx::Rect rect_;
 158
 159   blink::WebURLResponse response_;
 160   std::list<std::string> data_;
 161   bool finished_loading_;
 162   scoped_ptr<blink::WebURLError> error_;
 163   blink::WebString old_title_;
 164   bool focused_;
 165 };
 166
 167 #endif  // COMPONENTS_PLUGINS_RENDERER_WEBVIEW_PLUGIN_H_