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      1 // Copyright (c) 2012 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 CONTENT_BROWSER_RENDER_WIDGET_HOST_DELEGATE_H_
      6 #define CONTENT_BROWSER_RENDER_WIDGET_HOST_DELEGATE_H_
      7 
      8 #include "build/build_config.h"
      9 #include "content/common/content_export.h"
     10 #include "ui/gfx/native_widget_types.h"
     11 
     12 namespace WebKit {
     13 class WebMouseWheelEvent;
     14 }
     15 
     16 namespace content {
     17 
     18 class RenderWidgetHostImpl;
     19 struct NativeWebKeyboardEvent;
     20 
     21 //
     22 // RenderWidgetHostDelegate
     23 //
     24 //  An interface implemented by an object interested in knowing about the state
     25 //  of the RenderWidgetHost.
     26 class CONTENT_EXPORT RenderWidgetHostDelegate {
     27  public:
     28   // The RenderWidgetHost is going to be deleted.
     29   virtual void RenderWidgetDeleted(RenderWidgetHostImpl* render_widget_host) {}
     30 
     31   // Callback to give the browser a chance to handle the specified keyboard
     32   // event before sending it to the renderer.
     33   // Returns true if the |event| was handled. Otherwise, if the |event| would
     34   // be handled in HandleKeyboardEvent() method as a normal keyboard shortcut,
     35   // |*is_keyboard_shortcut| should be set to true.
     36   virtual bool PreHandleKeyboardEvent(const NativeWebKeyboardEvent& event,
     37                                       bool* is_keyboard_shortcut);
     38 
     39   // Callback to inform the browser that the renderer did not process the
     40   // specified events. This gives an opportunity to the browser to process the
     41   // event (used for keyboard shortcuts).
     42   virtual void HandleKeyboardEvent(const NativeWebKeyboardEvent& event) {}
     43 
     44   // Callback to give the browser a chance to handle the specified mouse wheel
     45   // event before sending it to the renderer.
     46   // Returns true if the |event| was handled.
     47   virtual bool PreHandleWheelEvent(const WebKit::WebMouseWheelEvent& event);
     48 
     49   // Notifies that screen rects were sent to renderer process.
     50   virtual void DidSendScreenRects(RenderWidgetHostImpl* rwh) {}
     51 
     52 #if defined(OS_WIN) && defined(USE_AURA)
     53   // Returns the widget's parent's NativeViewAccessible.
     54   virtual gfx::NativeViewAccessible GetParentNativeViewAccessible();
     55 #endif
     56 
     57  protected:
     58   virtual ~RenderWidgetHostDelegate() {}
     59 };
     60 
     61 }  // namespace content
     62 
     63 #endif  // CONTENT_BROWSER_RENDER_WIDGET_HOST_DELEGATE_H_
     64