content/renderer/resizing_mode_selector.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 CONTENT_RENDERER_RESIZING_MODE_SELECTOR_H_
   6 #define CONTENT_RENDERER_RESIZING_MODE_SELECTOR_H_
   7
   8 #include "base/basictypes.h"
   9
  10 struct ViewMsg_Resize_Params;
  11
  12 namespace content {
  13
  14 class RenderWidget;
  15
  16 // Enables switching between two modes of resizing:
  17 // 1) The "normal" (asynchronous) resizing, which involves sending messages to
  18 //    and receiving them from host; and
  19 // 2) The synchronous mode, which short-circuits the resizing logic to operate
  20 //    strictly inside renderer.
  21 // The latter is necessary to support a handful of layout tests that were
  22 // written with the expectation of a synchronous resize, and we're going to
  23 // eventually rewrite or remove all of them. See http://crbug.com/309760 for
  24 // details.
  25 class ResizingModeSelector {
  26  public:
  27   ResizingModeSelector();
  28   bool NeverUsesSynchronousResize() const;
  29   bool ShouldAbortOnResize(RenderWidget* widget,
  30                            const ViewMsg_Resize_Params& params);
  31
  32   void set_is_synchronous_mode(bool mode);
  33   bool is_synchronous_mode() const;
  34
  35  private:
  36   bool is_synchronous_mode_;
  37
  38   DISALLOW_COPY_AND_ASSIGN(ResizingModeSelector);
  39 };
  40
  41 }  // namespace content
  42
  43 #endif  // CONTENT_RENDERER_RESIZING_MODE_SELECTOR_H_