public static IEnumerable<FluentLayout> VerticalStackPanelConstraints(this UIView parentView, Margins margins,
params UIView[] views)
{
margins = margins ?? new Margins();
UIView previous = null;
foreach (var view in views)
{
yield return
view.Left()
.EqualTo()
.LeftOf(parentView)
.Plus(margins.Left);
yield return
view.Width()
.EqualTo()
.WidthOf(parentView)
.Minus(margins.Right + margins.Left);
if (previous != null)
yield return
view.Top()
.EqualTo()
.BottomOf(previous)
.Plus(margins.Top);
else
yield return
view.Top()
.EqualTo()
.TopOf(parentView)
.Plus(margins.Top);
previous = view;
}
if (parentView is UIScrollView)
yield return
previous
.Bottom()
.EqualTo()
.BottomOf(parentView)
.Minus(margins.Bottom);
}
public static IEnumerable <FluentLayout> VerticalStackPanelConstraints(this UIView parentView, Margins margins,
params UIView[] views)
{
margins = margins ?? new Margins();
UIView previous = null;
foreach (var view in views)
{
yield return(view.Left().EqualTo().LeftOf(parentView).Plus(margins.Left));
yield return(view.Width().EqualTo().WidthOf(parentView).Minus(margins.Right + margins.Left));
if (previous != null)
{
yield return(view.Top().EqualTo().BottomOf(previous).Plus(margins.VSpacing));
}
else
{
yield return(view.Top().EqualTo().TopOf(parentView).Plus(margins.Top));
}
previous = view;
}
if (parentView is UIScrollView)
{
yield return(previous.Bottom().EqualTo().BottomOf(parentView).Minus(margins.Bottom));
}
}
/// <summary>
/// Vertical stack panel constraints with support for children independent left, right and top margins
/// and a multiplier factor for all margins applied. The multiplier can be useful when dealing with iPad screens.
/// Example:
///
/// scrollView.AddConstraints(scrollView.AdvancedVerticalStackPanelConstraints(null,
/// childrenLeftMargins: new float[] { 15, 0, 15, 0, 0, 15 },
/// childrenTopMargins: new float[] { 15, 5, 15, 5, 8, 15, 22, 8, 8, 28, 28 },
/// marginMultiplier: 2f,
/// views: scrollView.Subviews)
/// );
/// </summary>
public static IEnumerable <FluentLayout> AdvancedVerticalStackPanelConstraints(this UIView parentView,
Margins margins,
float[] childrenLeftMargins = null,
float[] childrenTopMargins = null,
float[] childrenRightMargins = null,
float marginMultiplier = 1,
params UIView[] views)
{
string previousIdentifierPrefix = null;
margins = margins ?? new Margins();
var layouts = new List <FluentLayout>();
var count = views.Length;
for (var i = 0; i < count; i++)
{
var view = views[i];
var viewIdentifierPrefix = $"{parentView.AccessibilityIdentifier ?? "VerticalStackPanel"}-{view.AccessibilityIdentifier ?? i.ToString()}-";
float childLeftMargin;
childrenLeftMargins.TryGetElement(i, out childLeftMargin);
var marginLeft = Math.Max(margins.Left, childLeftMargin) * marginMultiplier;
layouts.Add(view.Left()
.EqualTo()
.LeftOf(parentView)
.Plus(marginLeft)
.WithIdentifier(viewIdentifierPrefix + "Left"));
float childRightMargin;
childrenRightMargins.TryGetElement(i, out childRightMargin);
var marginRight = Math.Max(margins.Right, childRightMargin) * marginMultiplier;
layouts.Add(view.Width()
.EqualTo()
.WidthOf(parentView)
.Minus(marginRight + marginLeft)
.WithIdentifier(viewIdentifierPrefix + "Width"));
float childTopMargin;
childrenTopMargins.TryGetElement(i, out childTopMargin);
layouts.Add(i == 0
? view.Top()
.EqualTo()
.TopOf(parentView)
.Plus(Math.Max(margins.Top, childTopMargin) * marginMultiplier)
.WithIdentifier(viewIdentifierPrefix + "Top")
: view.Top()
.EqualTo()
.BottomOf(views[i - 1])
.Plus(Math.Max(margins.VSpacing, childTopMargin) * marginMultiplier)
.WithIdentifier(viewIdentifierPrefix + "Top"));
previousIdentifierPrefix = viewIdentifierPrefix;
}
if (parentView is UIScrollView)
{
layouts.Add(views[views.Length - 1].Bottom()
.EqualTo()
.BottomOf(parentView)
.Minus(margins.Bottom * marginMultiplier)
.WithIdentifier(previousIdentifierPrefix + "Bottom"));
}
return(layouts);
}
public static IEnumerable <FluentLayout> VerticalStackPanelConstraints(this UIView parentView, Margins margins, params UIView[] views) => AdvancedVerticalStackPanelConstraints(parentView, margins, views: views);
public static IEnumerable <FluentLayout> FullSizeOf(this UIView view, UIView parent, Margins margins)
{
margins = margins ?? new Margins();
return(new List <FluentLayout>
{
view.AtTopOf(parent, margins.Top).WithIdentifier("Top"),
view.AtBottomOf(parent, margins.Bottom).WithIdentifier("Bottom"),
view.AtLeftOf(parent, margins.Left).WithIdentifier("Left"),
view.AtRightOf(parent, margins.Right).WithIdentifier("Right")
});
}
