content/browser/renderer_host/render_widget_host_delegate.h

   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 blink {
  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 blink::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_