public ButtonBarPagerTabStripViewController()
{
Delegate = this;
DataSource = this;
Func <IndicatorInfo, nfloat> widthCallback = GetWidth;
ButtonBarItemSpec = ButtonBarItemSpec <ButtonBarViewCell> .Create(widthCallback, "ButtonCell", NSBundle.FromClass(new ObjCRuntime.Class(typeof(ButtonBarViewCell))));
}
public ButtonBarPagerTabStripViewController(string nibName, NSBundle bundle) : base(nibName, bundle)
{
Delegate = this;
DataSource = this;
Func <IndicatorInfo, nfloat> widthCallback = GetWidth;
ButtonBarItemSpec = ButtonBarItemSpec <ButtonBarViewCell> .Create(widthCallback, "ButtonCell", null);
}
public ButtonBarPagerTabStripViewController(NSCoder coder) : base(coder)
{
Delegate = this;
DataSource = this;
Func <IndicatorInfo, nfloat> widthCallback = GetWidth;
ButtonBarItemSpec = ButtonBarItemSpec <ButtonBarViewCell> .Create(widthCallback, "ButtonCell", null);
}
public static ButtonBarItemSpec <ButtonBarViewCell> Create(Func <IndicatorInfo, nfloat> widthCallback, string nibName = null, NSBundle bundle = null)
{
ButtonBarItemSpec <ButtonBarViewCell> spec = new ButtonBarItemSpec <ButtonBarViewCell>()
{
WidthCallback = widthCallback, NibName = nibName, Bundle = bundle
};
return(spec);
}
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());
}
}