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_ 35
