public void AddWaveShader()
{
LearnerShimmer element = this.Element as LearnerShimmer;
int num1 = element.WaveDirection == WaveDirection.BottomToTop ? 1 : (element.WaveDirection == WaveDirection.TopToBottom ? 1 : 0);
int num2 = num1 != 0 ? 0 : this.Width;
int num3 = num1 != 0 ? this.Height : 0;
int android1 = (int)element.WaveColor.ToAndroid();
int android2 = (int)element.Color.ToAndroid();
float num4 = (float)element.WaveWidth * this.density / (float)this.Width;
float num5 = (double)num4 < 0.0 ? 0.0f : ((double)num4 > 1.0 ? 1f : num4);
float[] positions = new float[3]
{
(float)(0.5 - (double)num5 / 2.0),
0.5f,
(float)(0.5 + (double)num5 / 2.0)
};
this.shader = (Shader) new LinearGradient(0.0f, 0.0f, (float)num2, (float)num3, new int[3]
{
android2,
android1,
android2
}, positions, Shader.TileMode.Clamp);
this.wavePaint.SetShader(this.shader);
}
protected override void DispatchDraw(Canvas canvas)
{
LearnerShimmer element = this.Element as LearnerShimmer;
if (!element.IsActive || this.Height == 0 || this.Width == 0)
{
base.DispatchDraw(canvas);
}
else
{
if (element.CustomView == null)
{
this.DrawShimmerView(canvas);
}
base.DispatchDraw(canvas);
this.DrawShimmerWave(canvas);
}
}
private void DrawShimmerWave(Canvas canvas)
{
float num1 = (float)Math.Tan(Math.PI / 9.0);
float num2 = (float)this.Height + num1 * (float)this.Width;
float num3 = (float)this.Width + num1 * (float)this.Height;
float percent = this.animator != null ? this.animator.AnimatedFraction : 0.0f;
this.shimmerMatrix?.Reset();
LearnerShimmer element = this.Element as LearnerShimmer;
float dx;
float dy;
switch (element.WaveDirection)
{
case WaveDirection.TopToBottom:
dx = 0.0f;
dy = this.Offset(-num2, num2, percent);
break;
case WaveDirection.RightToLeft:
dx = this.Offset(num3, -num3, percent);
dy = 0.0f;
break;
case WaveDirection.BottomToTop:
dx = 0.0f;
dy = this.Offset(num2, -num2, percent);
break;
default:
dx = this.Offset(-num3, num3, percent);
dy = 0.0f;
if (element.WaveDirection == WaveDirection.Default)
{
this.shimmerMatrix.SetRotate(25f, (float)this.Width / 2f, (float)this.Height / 2f);
break;
}
break;
}
this.shimmerMatrix.PostTranslate(dx, dy);
this.wavePaint.Shader?.SetLocalMatrix(this.shimmerMatrix);
canvas.DrawRect(new Android.Graphics.Rect(0, 0, this.Width, this.Height), this.wavePaint);
}
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
LearnerShimmer element = this.Element as LearnerShimmer;
if (e.PropertyName == "Color" || e.PropertyName == "WaveColor" || (e.PropertyName == "WaveWidth" || e.PropertyName == "WaveDirection"))
{
this.AddWaveShader();
this.Invalidate();
}
else if (e.PropertyName == "AnimationDuration")
{
this.AddWaveAnimator();
this.Invalidate();
}
else if (e.PropertyName == "Type")
{
this.Invalidate();
}
else if (e.PropertyName == "IsActive")
{
if (element.IsActive)
{
this.UpdateShimmerWave();
}
else
{
this.animator?.End();
}
}
else
{
if (!(e.PropertyName == "BackgroundColor"))
{
return;
}
this.SetBackgroundColor(Android.Graphics.Color.Transparent);
}
}
