protected override void OnSizeAllocated(double width, double height)
{
base.OnSizeAllocated(width, height);
if (width < 10)
{
return;
}
MainGrid.Padding = new Thickness(0);
MainListView.ItemWidth = (int)((width * 0.90) / 3d);
MainListView.ItemHeight = (int)(MainListView.ItemWidth * 1.40d);
MainListView.WidthRequest = width * 0.90; //90% of the width.
MainListView.HeightRequest = (MainListView.ItemHeight + MainListView.ItemSpacing) * 2;
var req = MainListView.Measure(double.PositiveInfinity, double.PositiveInfinity);
var req2 = MainGrid.Measure(double.PositiveInfinity, double.NegativeInfinity);
var widthAvailable = width - req2.Request.Width;
var heightAvailable = height - req2.Request.Height - PhotosLabel.Height - PhotosLabel.Margin.VerticalThickness;
MainGrid.Padding = new Thickness(widthAvailable / 2d, heightAvailable / 2d, widthAvailable / 2d, heightAvailable / 2d);
}