public virtual void ReloadPagerTabStripView()
{
if (IsViewLoaded)
{
foreach (UIViewController childController in ViewControllers)
{
if (childController.ParentViewController != null)
{
childController.BeginAppearanceTransition(false, false);
childController.WillMoveToParentViewController(null);
childController.View.RemoveFromSuperview();
childController.RemoveFromParentViewController();
childController.EndAppearanceTransition();
}
}
ReloadViewControllers();
ContainerView.ContentSize = new CGSize(ContainerView.Bounds.Width * new nfloat(ViewControllers.Count()), ContainerView.ContentSize.Height);
if (CurrentIndex >= ViewControllers.Count())
{
CurrentIndex = (uint)ViewControllers.Count() - 1;
}
ContainerView.ContentOffset = new CGPoint(PageOffsetForChildIndex(CurrentIndex), 0);
UpdateContent();
}
}
public nfloat?[] CalculateWidths()
{
var flowLayout = ButtonBarView.CollectionViewLayout as UICollectionViewFlowLayout;
var numberOfCells = ViewControllers.Count();
List <nfloat> minimumCellWidths = new List <nfloat>();
nfloat collectionViewContentWidth = 0;
foreach (var viewController in ViewControllers)
{
var childController = viewController as IIndicatorInfoProvider;
var indicatorInfo = childController.IndicatorInfoForPagerTabStrip(this);
if (ButtonBarItemSpec.NibName == null)
{
nfloat width = width = ButtonBarItemSpec.WidthCallback(indicatorInfo);
minimumCellWidths.Add(width);
collectionViewContentWidth += width;
}
else
{
nfloat width = width = ButtonBarItemSpec.WidthCallback(indicatorInfo);
minimumCellWidths.Add(width);
collectionViewContentWidth += width;
}
}
var cellSpacingTotal = new nfloat(numberOfCells - 1) * flowLayout.MinimumLineSpacing;
collectionViewContentWidth += cellSpacingTotal;
nfloat collectionViewAvailableVisibleWidth = ButtonBarView.Frame.Size.Width - flowLayout.SectionInset.Left - flowLayout.SectionInset.Right;
if (!Settings.Style.ButtonBarItemsShouldFillAvailiableWidth || collectionViewAvailableVisibleWidth < collectionViewContentWidth)
{
return(minimumCellWidths.Select(i => (nfloat?)i).ToList().ToArray());
}
else
{
var stretchedCellWidthIfAllEqual = (collectionViewAvailableVisibleWidth - cellSpacingTotal) / new nfloat(numberOfCells);
var generalMinimumCellWidth = CalculateStretchedCellWidths(minimumCellWidths.ToArray(), suggestedStretchedCellWidth: stretchedCellWidthIfAllEqual, previousNumberOfLargeCells: 0);
List <nfloat> stretchedCellWidths = new List <nfloat>();
foreach (nfloat minimumCellWidthValue in minimumCellWidths)
{
var cellWidth = (minimumCellWidthValue > generalMinimumCellWidth) ? minimumCellWidthValue : generalMinimumCellWidth;
stretchedCellWidths.Add(cellWidth);
}
return(stretchedCellWidths.Select(i => (nfloat?)i).ToList().ToArray());
}
}
public int PageForVirtualPage(int virtualPage)
{
if (virtualPage < 0)
{
return(0);
}
if (virtualPage > ViewControllers.Count() - 1)
{
return(ViewControllers.Count() - 1);
}
return(virtualPage);
}
private Tuple <int, int, nfloat> ProgressiveIndicatorData(uint virtualPage)
{
var count = ViewControllers.Count();
int fromIndex = (int)CurrentIndex;
int toIndex = (int)CurrentIndex;
SwipeDirection direction = SwipeDirection;
if (direction == SwipeDirection.Left)
{
if (virtualPage > count - 1)
{
fromIndex = count - 1;
toIndex = count;
}
else
{
if (ScrollPercentage >= 0.5)
{
fromIndex = Math.Max(toIndex - 1, 0);
}
else
{
toIndex = fromIndex + 1;
}
}
}
else if (direction == SwipeDirection.Right)
{
if (virtualPage < 0)
{
fromIndex = 0;
toIndex = -1;
}
else
{
if (ScrollPercentage > 0.5)
{
fromIndex = Math.Min(toIndex + 1, count - 1);
}
else
{
toIndex = fromIndex - 1;
}
}
}
var scrollPercentage = PagerBehaviour.ElasticIndicatorLimit == true ? ScrollPercentage : ((toIndex < 0 || toIndex >= count) ? 0.0 : ScrollPercentage);
return(new Tuple <int, int, nfloat>(fromIndex, toIndex, new nfloat(scrollPercentage)));
}
public override IMXView PopView()
{
if (ViewControllers.Count(vc => !(vc is VanityView)) < 2 && PresentingViewController != null)
{
var view = base.PopViewController(false);
ModalManager.EnqueueModalTransition(PresentingViewController, null, true);
var pair = view as IPairable;
if (pair == null)
{
return(view as IMXView);
}
return((pair.Pair as IMXView) ?? pair as IMXView);
}
else
{
return(base.PopView());
}
}
private void ReloadViewControllers()
{
if (DataSource == null)
{
throw new NullReferenceException("DataSource cannot be null");
}
else
{
ViewControllers = DataSource.ViewControllersForPagerTabStrip(this);
// viewControllers
if (ViewControllers.Count() < 1)
{
throw new Exception("ViewControllersForPagerTabStrip should provide at least one child view controller");
}
foreach (UIViewController childController in ViewControllers)
{
if (!(childController is IIndicatorInfoProvider))
{
throw new Exception("Every view controller provided by PagerTabStripDataSource's viewControllersForPagerTabStrip method must conform to InfoProvider");
}
}
}
}
public nint GetItemsCount(UICollectionView collectionView, nint section)
{
return(ViewControllers.Count());
}
public bool CanMoveToIndex(nint index)
{
return(CurrentIndex != index && ViewControllers.Count() > index);
}