src/ElmSharp/ElmSharp/EcoreTimelineAnimator.cs

   1 using System;
   2 using System.Collections.Generic;
   3 using System.Text;
   4
   5 namespace ElmSharp
   6 {
   7     public class EcoreTimelineAnimator
   8     {
   9         double _runtime;
  10         IntPtr _animator;
  11         Action _timelineCallback;
  12         Interop.Ecore.EcoreTimelineCallback _nativeCallback;
  13         double _position;
  14
  15         public event EventHandler Finished;
  16
  17
  18         public EcoreTimelineAnimator(double runtime, Action timelineCallback)
  19         {
  20             _runtime = runtime;
  21             _nativeCallback = NativeCallback;
  22             _timelineCallback = timelineCallback;
  23             _position = 0;
  24         }
  25
  26         public bool IsRunning { get; private set; }
  27         public double Position => _position;
  28
  29         public void Start()
  30         {
  31             IsRunning = true;
  32             _animator = Interop.Ecore.ecore_animator_timeline_add(_runtime, _nativeCallback, IntPtr.Zero);
  33         }
  34
  35         public void Stop()
  36         {
  37             IsRunning = false;
  38             _animator = IntPtr.Zero;
  39         }
  40
  41         public void Freeze()
  42         {
  43             Interop.Ecore.ecore_animator_freeze(_animator);
  44         }
  45
  46         public void Thaw()
  47         {
  48             Interop.Ecore.ecore_animator_thaw(_animator);
  49         }
  50
  51         protected void OnTimeline()
  52         {
  53             _timelineCallback();
  54         }
  55
  56         bool NativeCallback(IntPtr data, double pos)
  57         {
  58             _position = pos;
  59             if (!IsRunning) return false;
  60             OnTimeline();
  61             if (pos == 1.0)
  62             {
  63                 IsRunning = false;
  64                 _animator = IntPtr.Zero;
  65                 Finished?.Invoke(this, EventArgs.Empty);
  66             }
  67             return true;
  68         }
  69     }
  70 }