public void Fling(float velocityX, float velocityY)
{
CancelAnimation();
ViewChanging?.Invoke(this, new EventArgs());
// Velocity is pixels per second, but it comes in extremely powerful, so we'll downgrade it some
velocityX = SanitizeFlingVelocity(velocityX);
velocityY = SanitizeFlingVelocity(velocityY);
if (velocityX == 0 && velocityY == 0)
{
return;
}
float calculatedHorizontalOffset = HorizontalOffset - velocityX;
float calculatedVerticalOffset = VerticalOffset - velocityY;
float safeHorizontalOffset = SanitizeHorizontalOffset(calculatedHorizontalOffset);
float safeVerticalOffset = SanitizeVerticalOffset(calculatedVerticalOffset);
float calculatedTranslationX = CalculateTranslationX(calculatedHorizontalOffset);
float calculatedTranslationY = CalculateTranslationY(calculatedVerticalOffset);
float safeTranslationX = CalculateTranslationX(safeHorizontalOffset);
float safeTranslationY = CalculateTranslationY(safeVerticalOffset);
for (int i = 0; i < base.ChildCount; i++)
{
var view = GetChildAt(i);
var animator = ObjectAnimator.OfFloat(view, "translationX", calculatedTranslationX);
animator.SetDuration(1000);
animator.SetInterpolator(new MyInterpolator(animator, view.TranslationX, calculatedTranslationX, safeTranslationX));
animator.AnimationCancel += (s, e) =>
{
view.TranslationX = (float)(s as ObjectAnimator).AnimatedValue;
};
animator.AnimationEnd += (s, e) =>
{
view.TranslationX = (float)(s as ObjectAnimator).AnimatedValue;
};
animator.Start();
_currentAnimators.Add(animator);
animator = ObjectAnimator.OfFloat(view, "translationY", calculatedTranslationY);
animator.SetDuration(1000);
animator.SetInterpolator(new MyInterpolator(animator, view.TranslationY, calculatedTranslationY, safeTranslationY));
animator.AnimationCancel += (s, e) =>
{
view.TranslationY = (float)(s as ObjectAnimator).AnimatedValue;
};
animator.AnimationEnd += (s, e) =>
{
view.TranslationY = (float)(s as ObjectAnimator).AnimatedValue;
};
animator.Start();
_currentAnimators.Add(animator);
}
}
public void ChangeView(float?horizontalOffset, float?verticalOffset, float?zoomFactor)
{
CancelAnimation();
ViewChanging?.Invoke(this, new EventArgs());
if (zoomFactor != null)
{
ZoomFactor = Math.Max(MinZoomFactor, Math.Min(MaxZoomFactor, zoomFactor.Value));
}
float finalHorizontalOffset = HorizontalOffset;
if (horizontalOffset != null)
{
finalHorizontalOffset = horizontalOffset.Value;
}
finalHorizontalOffset = SanitizeHorizontalOffset(finalHorizontalOffset);
float finalVerticalOffset = VerticalOffset;
if (verticalOffset != null)
{
finalVerticalOffset = verticalOffset.Value;
}
finalVerticalOffset = SanitizeVerticalOffset(finalVerticalOffset);
for (int i = 0; i < base.ChildCount; i++)
{
var view = GetChildAt(i);
view.TranslationX = CalculateTranslationX(finalHorizontalOffset);
view.TranslationY = CalculateTranslationY(finalVerticalOffset);
view.ScaleX = ZoomFactor;
view.ScaleY = ZoomFactor;
}
}
