/// <summary>
/// The event handler for the thumbnails. Called when they are clicked, it display
/// the full sized image, animating the transition from thumbnail to full sized image.
/// </summary>
/// <param name="sender"></param>
/// <param name="eventArgs"></param>
private void ZoomImageFromThumb(object sender, EventArgs eventArgs)
{
View thumbView = (View)sender;
ImageView expandedImageView = GetExpandedImageView(thumbView);
if (_currentAnimator != null)
{
_currentAnimator.Cancel();
}
Rect startBounds = new Rect();
Rect finalBounds = new Rect();
Point globalOffset = new Point();
// The start bounds are the global visible rectangle of the thumbnail
thumbView.GetGlobalVisibleRect(startBounds);
// The final bounds are the global visible rectangle of the container view. Also
// set the container view's offset as the origin for the bounds, since that's
// the origin for the positioning animation properties (X, Y).
FindViewById(Resource.Id.container).GetGlobalVisibleRect(finalBounds, globalOffset);
startBounds.Offset(-globalOffset.X, -globalOffset.Y);
finalBounds.Offset(-globalOffset.X, -globalOffset.Y);
float startScale = CalculateStartScale(startBounds, finalBounds);
// Construct and run the parallel animation of the four translation and scale properties
// (X, Y, SCALE_X, and SCALE_Y).
AnimatorSet expandSet = BuildExpandingAnimatorSet(expandedImageView, startBounds, finalBounds, startScale);
expandSet.Start();
_currentAnimator = expandSet;
// Upon clicking the zoomed image, it should zoom back down to the original bounds
// and show the thumbnail instead of the expanded image.
expandedImageView.Click += (o, args) =>{
if (_currentAnimator != null)
{
_currentAnimator.Cancel();
}
AnimatorSet shrinkSet = BuildShrinkingAnimatorSet(expandedImageView, thumbView, startBounds, startScale);
shrinkSet.Start();
_currentAnimator = shrinkSet;
};
}
