ui/gfx/animation/animation_container_element.h

   1 // Copyright (c) 2011 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 UI_GFX_ANIMATION_ANIMATION_CONTAINER_ELEMENT_H_
   6 #define UI_GFX_ANIMATION_ANIMATION_CONTAINER_ELEMENT_H_
   7
   8 #include "base/time/time.h"
   9 #include "ui/gfx/gfx_export.h"
  10
  11 namespace gfx {
  12
  13 // Interface for the elements the AnimationContainer contains. This is
  14 // implemented by Animation.
  15 class GFX_EXPORT AnimationContainerElement {
  16  public:
  17   // Sets the start of the animation. This is invoked from
  18   // AnimationContainer::Start.
  19   virtual void SetStartTime(base::TimeTicks start_time) = 0;
  20
  21   // Invoked when the animation is to progress.
  22   virtual void Step(base::TimeTicks time_now) = 0;
  23
  24   // Returns the time interval of the animation. If an Element needs to change
  25   // this it should first invoke Stop, then Start.
  26   virtual base::TimeDelta GetTimerInterval() const = 0;
  27
  28  protected:
  29   virtual ~AnimationContainerElement() {}
  30 };
  31
  32 }  // namespace gfx
  33
  34 #endif  // UI_GFX_ANIMATION_ANIMATION_CONTAINER_ELEMENT_H_