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      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 CHROME_BROWSER_UI_AUTOFILL_LOADING_ANIMATION_H_
      6 #define CHROME_BROWSER_UI_AUTOFILL_LOADING_ANIMATION_H_
      7 
      8 #include "ui/gfx/animation/linear_animation.h"
      9 
     10 namespace autofill {
     11 
     12 // An animation for a dancing ellipsis.
     13 class LoadingAnimation : public gfx::LinearAnimation {
     14  public:
     15   explicit LoadingAnimation(gfx::AnimationDelegate* delegate,
     16                             int font_height);
     17   virtual ~LoadingAnimation();
     18 
     19   // gfx::Animation implementation.
     20   virtual void Step(base::TimeTicks time_now) OVERRIDE;
     21 
     22   // Returns the vertical pixel offset for the nth dot.
     23   double GetCurrentValueForDot(size_t dot_i) const;
     24 
     25   // Stops this animation. Use this instead of Stop() to make sure future
     26   // runs don't mess up on the first cycle.
     27   void Reset();
     28 
     29  private:
     30   // Describes a frame of the animation, a la -webkit-keyframes.
     31   struct AnimationFrame {
     32     double value;
     33     double position;
     34   };
     35 
     36   // True if the current cycle is the first one since Reset() was last called.
     37   bool first_cycle_;
     38 
     39   // The font height of the loading text, which gives the factor by which to
     40   // scale the animation.
     41   const int font_height_;
     42 };
     43 
     44 }  // namespace autofill
     45 
     46 #endif  // CHROME_BROWSER_UI_AUTOFILL_LOADING_ANIMATION_H_
     47