public override UICollectionViewLayoutAttributes[] LayoutAttributesForElementsInRect(RectangleF rect)
{
var layoutAttributes = base.LayoutAttributesForElementsInRect(rect);
var modified = new List <UICollectionViewLayoutAttributes>();
var horizontalCenter = CollectionView.Bounds.Width / 2.0;
foreach (var layout in layoutAttributes)
{
var originInCollectionView = new PointF(layout.Frame.Location.X, layout.Frame.Location.Y);
var originInMainView = _superView.ConvertPointFromView(originInCollectionView, CollectionView);
var centerInCollectionView = layout.Center; // new PointF(layout.c.Frame.Left + layout.Frame.Width/2,
//layout.Frame.Top + layout.Frame.Height/2);
var centerInMainView = _superView.ConvertPointFromView(centerInCollectionView, CollectionView);
var rotateBy = 0.0f;
var translateBy = PointF.Empty;
// we find out where this cell is relative to the center of the viewport, and invoke private methods to deduce the
// amount of rotation to apply
if (originInMainView.X < CollectionView.Frame.Width + 80.0f)
{
translateBy = CalculateTranslateBy(horizontalCenter, layout);
rotateBy = CalculateRotationFromViewPortDistance(originInMainView.X);
var rotationPoint = new PointF(CollectionView.Frame.Width / 2, CollectionView.Frame.Height);
// there are two transforms and one rotation. this is needed to make the view appear to have rotated around
// a certain point.
CATransform3D transform = CATransform3D.Identity;
transform = transform.Translate(rotationPoint.X - centerInMainView.X,
rotationPoint.Y - centerInMainView.Y, 0.0f);
transform = transform.Rotate(Maths.DegreesToRadians(-rotateBy), 0.0f, 0.0f, -1.0f);
// -30.0f to lift the cards up a bit
transform = transform.Translate(centerInMainView.X - rotationPoint.X,
centerInMainView.Y - rotationPoint.Y - 30.0f, 0.0f);
layout.Transform3D = transform;
// right card is always on top
layout.ZIndex = layout.IndexPath.Item;
modified.Add(layout);
}
}
return(modified.ToArray());
}
void ApplyMaskScale(float scale)
{
// ultimately this scales the layer from the center out (rather than top/left)
// create a transform that translates the layer by half its width/height
// and then scales it
CATransform3D translateScale = new CATransform3D();
translateScale = CATransform3D.Identity;
translateScale = translateScale.Scale(scale);
translateScale = translateScale.Translate(-(Label.Layer.Mask.Bounds.Width / 2), -(Label.Layer.Mask.Bounds.Height / 2), 0);
// now apply a transform that puts it back by its width/height, effectively re-centering it.
CATransform3D postScale = new CATransform3D();
postScale = CATransform3D.Identity;
postScale = postScale.Translate((Label.Layer.Mask.Bounds.Width / 2), (Label.Layer.Mask.Bounds.Height / 2), 0);
// and now concat the post scale and apply
Label.Layer.Mask.Transform = translateScale.Concat(postScale);
}
private void OnUpdateNativeControl(CALayer caLayer)
{
VisualElement view = this.Renderer.Element;
NSView nativeView = this.Renderer.NativeView;
if (view == null || view.Batched)
{
return;
}
if (this.inputTransparent != view.InputTransparent)
{
// TODO: WT.?
//nativeView.UserInteractionEnabled = !view.InputTransparent;
this.inputTransparent = view.InputTransparent;
}
bool boundsChanged = this.lastBounds != view.Bounds;
int num = boundsChanged ? 0 : (!caLayer.Frame.IsEmpty ? 1 : 0);
float anchorX = (float)view.AnchorX;
float anchorY = (float)view.AnchorY;
float translationX = (float)view.TranslationX;
float translationY = (float)view.TranslationY;
float rotationX = (float)view.RotationX;
float rotationY = (float)view.RotationY;
float rotation = (float)view.Rotation;
float scale = (float)view.Scale;
float width = (float)view.Width;
float height = (float)view.Height;
float x = (float)view.X;
float y = (float)view.Y;
float opacity = (float)view.Opacity;
bool isVisible = (view.IsVisible ? 1 : 0) != 0;
int updateTarget = Interlocked.Increment(ref this.updateCount);
Action action = (Action)(() =>
{
if (updateTarget != this.updateCount)
{
return;
}
VisualElement visualElement = view;
Element parent = view.Parent;
bool flag = false;
if (isVisible && caLayer.Hidden)
{
caLayer.Hidden = false;
if (!caLayer.Frame.IsEmpty)
{
flag = true;
}
}
if (!isVisible && !caLayer.Hidden)
{
caLayer.Hidden = true;
flag = true;
}
CATransform3D caTransform3D = CATransform3D.Identity;
if (((visualElement is Page && !(visualElement is ContentPage) || ((double)width <= 0.0 || (double)height <= 0.0) ? 0 : (parent != null ? 1 : 0)) & (boundsChanged ? 1 : 0)) != 0)
{
RectangleF rectangleF = new RectangleF(x, y, width, height);
caLayer.Transform = caTransform3D;
caLayer.Frame = (CGRect)rectangleF;
if (flag)
{
caLayer.LayoutSublayers();
}
}
else if ((double)width <= 0.0 || (double)height <= 0.0)
{
caLayer.Hidden = true;
return;
}
caLayer.AnchorPoint = (CGPoint) new PointF(anchorX, anchorY);
caLayer.Opacity = opacity;
if (Math.Abs((double)anchorX - 0.5) > 0.001)
{
caTransform3D = caTransform3D.Translate((nfloat)((anchorX - 0.5f) * width), (nfloat)0, (nfloat)0);
}
if (Math.Abs((double)anchorY - 0.5) > 0.001)
{
caTransform3D = caTransform3D.Translate((nfloat)0, (nfloat)((anchorY - 0.5f) * height), (nfloat)0);
}
if ((double)Math.Abs(translationX) > 0.001 || (double)Math.Abs(translationY) > 0.001)
{
caTransform3D = caTransform3D.Translate((nfloat)translationX, (nfloat)translationY, (nfloat)0);
}
if ((double)Math.Abs(scale - 1f) > 0.001)
{
caTransform3D = caTransform3D.Scale((nfloat)scale);
}
if ((double)Math.Abs(rotationY % 180f) > 0.001 || (double)Math.Abs(rotationX % 180f) > 0.001)
{
caTransform3D.m34 = (nfloat)(-1.0 / 400.0);
}
if ((double)Math.Abs(rotationX % 360f) > 0.001)
{
caTransform3D = caTransform3D.Rotate((nfloat)((float)((double)rotationX * 3.14159274101257 / 180.0)), (nfloat)1f, (nfloat)0.0f, (nfloat)0.0f);
}
if ((double)Math.Abs(rotationY % 360f) > 0.001)
{
caTransform3D = caTransform3D.Rotate((nfloat)((float)((double)rotationY * 3.14159274101257 / 180.0)), (nfloat)0.0f, (nfloat)1f, (nfloat)0.0f);
}
caTransform3D = caTransform3D.Rotate((nfloat)((float)((double)rotation * 3.14159274101257 / 180.0)), (nfloat)0.0f, (nfloat)0.0f, (nfloat)1f);
caLayer.Transform = caTransform3D;
});
// TODO: Figure this out
/*
* if (num != 0)
* CADisplayLinkTicker.Default.Invoke (action);
* else
*/
action();
this.lastBounds = view.Bounds;
}