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 class WebGestureEvent;
  15 }
  16
  17 namespace content {
  18
  19 class RenderWidgetHostImpl;
  20 struct NativeWebKeyboardEvent;
  21
  22 //
  23 // RenderWidgetHostDelegate
  24 //
  25 //  An interface implemented by an object interested in knowing about the state
  26 //  of the RenderWidgetHost.
  27 class CONTENT_EXPORT RenderWidgetHostDelegate {
  28  public:
  29   // The RenderWidgetHost is going to be deleted.
  30   virtual void RenderWidgetDeleted(RenderWidgetHostImpl* render_widget_host) {}
  31
  32   // Callback to give the browser a chance to handle the specified keyboard
  33   // event before sending it to the renderer.
  34   // Returns true if the |event| was handled. Otherwise, if the |event| would
  35   // be handled in HandleKeyboardEvent() method as a normal keyboard shortcut,
  36   // |*is_keyboard_shortcut| should be set to true.
  37   virtual bool PreHandleKeyboardEvent(const NativeWebKeyboardEvent& event,
  38                                       bool* is_keyboard_shortcut);
  39
  40   // Callback to inform the browser that the renderer did not process the
  41   // specified events. This gives an opportunity to the browser to process the
  42   // event (used for keyboard shortcuts).
  43   virtual void HandleKeyboardEvent(const NativeWebKeyboardEvent& event) {}
  44
  45   // Callback to inform the browser that the renderer did not process the
  46   // specified mouse wheel event.  Returns true if the browser has handled
  47   // the event itself.
  48   virtual bool HandleWheelEvent(const blink::WebMouseWheelEvent& event);
  49
  50   // Callback to give the browser a chance to handle the specified gesture
  51   // event before sending it to the renderer.
  52   // Returns true if the |event| was handled.
  53   virtual bool PreHandleGestureEvent(const blink::WebGestureEvent& event);
  54
  55   // Callback to inform the browser that the renderer did not process the
  56   // specified gesture event.  Returns true if the |event| was handled.
  57   virtual bool HandleGestureEvent(const blink::WebGestureEvent& event);
  58
  59   // Notifies that screen rects were sent to renderer process.
  60   virtual void DidSendScreenRects(RenderWidgetHostImpl* rwh) {}
  61
  62 #if defined(OS_WIN)
  63   // Returns the widget's parent's NativeViewAccessible.
  64   virtual gfx::NativeViewAccessible GetParentNativeViewAccessible();
  65 #endif
  66
  67  protected:
  68   virtual ~RenderWidgetHostDelegate() {}
  69 };
  70
  71 }  // namespace content
  72
  73 #endif  // CONTENT_BROWSER_RENDER_WIDGET_HOST_DELEGATE_H_