void SetRelativeLayoutConstraints()
{
circleLayout.SetConstraints(topLevelLayout,
xConstraint: ExposedConstraint.RelativeToParent((parent) => { return(parent.Width / 2 - 37.5); }),
yConstraint: ExposedConstraint.RelativeToView(mainFrame, (parent, sibling) => { return(mainFrame.Y - 37.5); }));
defaultLayout.SetConstraints(circleLayout,
ExposedConstraint.RelativeToView(outerCircle, (parent, sibling) => { return(outerCircle.X + 5); }),
ExposedConstraint.RelativeToView(outerCircle, (parent, sibling) => { return(outerCircle.Y + 5); }),
ExposedConstraint.RelativeToParent((parent) => { return(parent.Width - 10); }),
ExposedConstraint.RelativeToParent((parent) => { return(parent.Height - 10); }));
}
/// <summary>
/// Alternative method for defining constraints within a <see cref="RelativeLayout"/> using <see cref="ExposedConstraint"/>
/// </summary>
/// <param name="relativeLayout"><see cref="RelativeLayout"/> to add the <paramref name="view"/> to.</param>
/// <param name="xConstraint">X constraint.</param>
/// <param name="yConstraint">Y constraint.</param>
/// <param name="widthConstraint">Width constraint.</param>
/// <param name="heightConstraint">Height constraint.</param>
public static void SetConstraints(this View view, RelativeLayout relativeLayout,
ExposedConstraint xConstraint = null, ExposedConstraint yConstraint = null,
ExposedConstraint widthConstraint = null, ExposedConstraint heightConstraint = null)
{
var parents = new List <View>();
Func <double> x;
if (xConstraint != null)
{
x = () => xConstraint.Compute(relativeLayout);
if (xConstraint.RelativeTo != null)
{
parents.AddRange(xConstraint.RelativeTo);
}
}
else
{
x = () => 0;
}
Func <double> y;
if (yConstraint != null)
{
y = () => yConstraint.Compute(relativeLayout);
if (yConstraint.RelativeTo != null)
{
parents.AddRange(yConstraint.RelativeTo);
}
}
else
{
y = () => 0;
}
Func <double> width;
if (widthConstraint != null)
{
width = () => widthConstraint.Compute(relativeLayout);
if (widthConstraint.RelativeTo != null)
{
parents.AddRange(widthConstraint.RelativeTo);
}
}
else
{
width = () => view.Measure(relativeLayout.Width, relativeLayout.Height, MeasureFlags.IncludeMargins).Request.Width;
}
Func <double> height;
if (heightConstraint != null)
{
height = () => heightConstraint.Compute(relativeLayout);
if (heightConstraint.RelativeTo != null)
{
parents.AddRange(heightConstraint.RelativeTo);
}
}
else
{
height = () => view.Measure(relativeLayout.Width, relativeLayout.Height, MeasureFlags.IncludeMargins).Request.Height;
}
BoundsConstraint bounds = BoundsConstraint.FromExpression(() => new Rectangle(x(), y(), width(), height()), parents.Distinct().ToArray());
RelativeLayout.SetBoundsConstraint(view, bounds);
}
