chrome/browser/ui/autofill/loading_animation.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 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_