private IList<nfloat> CalculateWidths()
{
var flowLayout = ButtonBarView.CollectionViewLayout as UICollectionViewFlowLayout;
var numberOfCells = ViewControllers.Count;
var minimumCellWidths = new List<nfloat>();
nfloat collectionViewContentWidth = 0;
foreach (var viewController in ViewControllers)
{
var childController = viewController as IndicatorInfoProvider;
var indicatorInfo = childController.GetIndicatorInfo(this);
switch (ButtonBarItemSpec.ButtonBarItemSpecType)
{
case ButtonBarItemSpecType.CellClass:
{
var width = ButtonBarItemSpec.Width(indicatorInfo);
minimumCellWidths.Add(width);
collectionViewContentWidth += width;
}
break;
case ButtonBarItemSpecType.NibFile:
{
var width = ButtonBarItemSpec.Width(indicatorInfo);
minimumCellWidths.Add(width);
collectionViewContentWidth += width;
}
break;
}
}
var cellSpacingTotal = (numberOfCells - 1) * flowLayout.MinimumLineSpacing;
collectionViewContentWidth += cellSpacingTotal;
var collectionViewAvailableVisibleWidth = ButtonBarView.Frame.Width - flowLayout.SectionInset.Left - flowLayout.SectionInset.Right;
if (!Settings.Style.ButtonBarItemsShouldFillAvailiableWidth || collectionViewAvailableVisibleWidth < collectionViewContentWidth)
{
return minimumCellWidths;
}
else
{
var stretchedCellWidthIfAllEqual = (collectionViewAvailableVisibleWidth - cellSpacingTotal) / numberOfCells;
var generalMinimumCellWidth = CalculateStretchedCellWidths(minimumCellWidths, stretchedCellWidthIfAllEqual, 0);
var stretchedCellWidths = new List<nfloat>();
foreach (var minimumCellWidthValue in minimumCellWidths)
{
var cellWidth = (minimumCellWidthValue > generalMinimumCellWidth) ? minimumCellWidthValue : generalMinimumCellWidth;
stretchedCellWidths.Add(cellWidth);
}
return stretchedCellWidths;
}
}
public override void ViewDidLoad()
{
base.ViewDidLoad();
ButtonBarItemSpec = ButtonBarItemSpec.NibFile(
nibName: "ButtonCell",
bundle: NSBundle.FromClass(new ObjCRuntime.Class(typeof(ButtonBarViewCell))),
width: (childItemInfo) =>
{
var label = new UILabel();
label.TranslatesAutoresizingMaskIntoConstraints = false;
label.Font = this.Settings.Style.ButtonBarItemFont;
label.Text = childItemInfo.Title;
var labelSize = label.IntrinsicContentSize;
return labelSize.Width + (this.Settings.Style.ButtonBarItemLeftRightMargin?? 8) * 2;
});
UICollectionViewFlowLayout flowLayout;
if (ButtonBarView == null)
{
flowLayout = new UICollectionViewFlowLayout();
flowLayout.ScrollDirection = UICollectionViewScrollDirection.Horizontal;
var buttonBarHeight = Settings.Style.ButtonBarHeight ?? 44f;
var buttonBar = new ButtonBarView(new CGRect(0, 0, View.Frame.Width, buttonBarHeight), flowLayout);
buttonBar.BackgroundColor = UIColor.Orange;
buttonBar.SelectedBar.BackgroundColor = UIColor.Black;
buttonBar.AutoresizingMask = UIViewAutoresizing.FlexibleWidth;
var newContainerViewFrame = ContainerView.Frame;
newContainerViewFrame.Y = buttonBarHeight;
newContainerViewFrame.Height = ContainerView.Frame.Height - (buttonBarHeight - ContainerView.Frame.Y);
ContainerView.Frame = newContainerViewFrame;
ButtonBarView = buttonBar;
}
if (ButtonBarView.Superview == null)
{
View.AddSubview(ButtonBarView);
}
if (ButtonBarView.Delegate == null)
{
ButtonBarView.Delegate = this;
}
if (ButtonBarView.DataSource == null)
{
ButtonBarView.DataSource = this;
}
ButtonBarView.ScrollsToTop = false;
flowLayout = ButtonBarView.CollectionViewLayout as UICollectionViewFlowLayout;
flowLayout.ScrollDirection = UICollectionViewScrollDirection.Horizontal;
flowLayout.MinimumInteritemSpacing = 0;
flowLayout.MinimumLineSpacing = Settings.Style.ButtonBarMinimumLineSpacing ?? flowLayout.MinimumLineSpacing;
var sectionInset = flowLayout.SectionInset;
flowLayout.SectionInset = new UIEdgeInsets(sectionInset.Top,
Settings.Style.ButtonBarLeftContentInset ?? sectionInset.Left,
sectionInset.Bottom,
Settings.Style.ButtonBarRightContentInset ?? sectionInset.Right);
ButtonBarView.ShowsHorizontalScrollIndicator = false;
ButtonBarView.BackgroundColor = Settings.Style.ButtonBarBackgroundColor ?? ButtonBarView.BackgroundColor;
ButtonBarView.SelectedBar.BackgroundColor = Settings.Style.SelectedBarBackgroundColor;
ButtonBarView.SelectedBarHeight = Settings.Style.SelectedBarHeight;
switch (ButtonBarItemSpec.ButtonBarItemSpecType)
{
case ButtonBarItemSpecType.NibFile:
{
ButtonBarView.RegisterNibForCell(UINib.FromName(ButtonBarItemSpec.NibName, ButtonBarItemSpec.Bundle), "Cell");
}
break;
case ButtonBarItemSpecType.CellClass:
{
ButtonBarView.RegisterClassForCell(typeof(ButtonBarViewCell), "Cell");
}
break;
}
}