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_RENDERER_HOST_RENDER_WIDGET_HOST_DELEGATE_H_
   6 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_DELEGATE_H_
   7
   8 #include "base/basictypes.h"
   9 #include "build/build_config.h"
  10 #include "content/common/content_export.h"
  11 #include "ui/gfx/native_widget_types.h"
  12
  13 namespace blink {
  14 class WebMouseWheelEvent;
  15 class WebGestureEvent;
  16 }
  17
  18 namespace content {
  19
  20 class BrowserAccessibilityManager;
  21 class RenderWidgetHostImpl;
  22 struct NativeWebKeyboardEvent;
  23
  24 //
  25 // RenderWidgetHostDelegate
  26 //
  27 //  An interface implemented by an object interested in knowing about the state
  28 //  of the RenderWidgetHost.
  29 class CONTENT_EXPORT RenderWidgetHostDelegate {
  30  public:
  31   // The RenderWidgetHost is going to be deleted.
  32   virtual void RenderWidgetDeleted(RenderWidgetHostImpl* render_widget_host) {}
  33
  34   // The RenderWidgetHost got the focus.
  35   virtual void RenderWidgetGotFocus(RenderWidgetHostImpl* render_widget_host) {}
  36
  37   // The RenderWidget was resized.
  38   virtual void RenderWidgetWasResized(RenderWidgetHostImpl* render_widget_host,
  39                                       bool width_changed) {}
  40
  41   // The screen info has changed.
  42   virtual void ScreenInfoChanged() {}
  43
  44   // Callback to give the browser a chance to handle the specified keyboard
  45   // event before sending it to the renderer.
  46   // Returns true if the |event| was handled. Otherwise, if the |event| would
  47   // be handled in HandleKeyboardEvent() method as a normal keyboard shortcut,
  48   // |*is_keyboard_shortcut| should be set to true.
  49   virtual bool PreHandleKeyboardEvent(const NativeWebKeyboardEvent& event,
  50                                       bool* is_keyboard_shortcut);
  51
  52   // Callback to inform the browser that the renderer did not process the
  53   // specified events. This gives an opportunity to the browser to process the
  54   // event (used for keyboard shortcuts).
  55   virtual void HandleKeyboardEvent(const NativeWebKeyboardEvent& event) {}
  56
  57   // Callback to inform the browser that the renderer did not process the
  58   // specified mouse wheel event.  Returns true if the browser has handled
  59   // the event itself.
  60   virtual bool HandleWheelEvent(const blink::WebMouseWheelEvent& event);
  61
  62   // Callback to give the browser a chance to handle the specified gesture
  63   // event before sending it to the renderer.
  64   // Returns true if the |event| was handled.
  65   virtual bool PreHandleGestureEvent(const blink::WebGestureEvent& event);
  66
  67   // Notifies that screen rects were sent to renderer process.
  68   virtual void DidSendScreenRects(RenderWidgetHostImpl* rwh) {}
  69
  70   // Get the root BrowserAccessibilityManager for this frame tree.
  71   virtual BrowserAccessibilityManager* GetRootBrowserAccessibilityManager();
  72
  73   // Get the root BrowserAccessibilityManager for this frame tree,
  74   // or create it if it doesn't exist.
  75   virtual BrowserAccessibilityManager*
  76       GetOrCreateRootBrowserAccessibilityManager();
  77
  78 #if defined(OS_WIN)
  79   virtual gfx::NativeViewAccessible GetParentNativeViewAccessible();
  80 #endif
  81
  82  protected:
  83   virtual ~RenderWidgetHostDelegate() {}
  84 };
  85
  86 }  // namespace content
  87
  88 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_DELEGATE_H_