private void ConstraintWidthToFittingSizeIfNecessary(ref ComputeLayoutTuple layout)
{
if (width != null)
{
return;
}
if (layout.width < FittingWidth())
{
layout.width = FittingWidth();
}
}
private void ConstraintWidthToBoundsIfNecessary(ref ComputeLayoutTuple layout, UIWindow window)
{
var windowMaxX = window.Bounds.GetMaxX();
var maxX = layout.x + layout.width;
if (maxX > windowMaxX)
{
var delta = maxX - windowMaxX;
var newOrigin = layout.x - delta;
if (newOrigin > 0)
{
layout.x = newOrigin;
}
else
{
layout.x = 0;
layout.width += newOrigin; // newOrigin is negative, so this operation is a substraction
}
}
}
private LayoutResult ComputeLayout()
{
var layout = new ComputeLayoutTuple(0, 0, 0, 0);
var dir = Direction;
var window = VisibleWindow();
if (window == null)
{
return(new LayoutResult(0, 0, 0, 0, 0, false, dir));
}
if (anchorView != null)
{
var av = anchorView as UIBarButtonItemAnchorView;
if (av != null)
{
var isRightBarButtonItem = anchorView.PlainView.Frame.GetMinX() > window.Frame.GetMidX();
if (isRightBarButtonItem)
{
nfloat w = width ?? FittingWidth();
var anchorViewWidth = anchorView.PlainView.Frame.Width;
var x = -(w - anchorViewWidth);
bottomOffset = new CGPoint(x, 0);
}
}
}
if (anchorView == null)
{
layout = ComputeLayoutBottomDisplay(window);
Direction = Direction.Any;
}
else
{
switch (Direction)
{
case Direction.Any:
layout = ComputeLayoutBottomDisplay(window);
Direction = Direction.Bottom;
if (layout.offscreenHeight > 0)
{
var topLayout = ComputeLayoutForTopDisplay(window);
if (topLayout.offscreenHeight < layout.offscreenHeight)
{
layout = topLayout;
Direction = Direction.Top;
}
}
break;
case Direction.Bottom:
layout = ComputeLayoutBottomDisplay(window);
Direction = Direction.Bottom;
break;
case Direction.Top:
layout = ComputeLayoutForTopDisplay(window);
Direction = Direction.Top;
break;
}
}
ConstraintWidthToFittingSizeIfNecessary(ref layout);
ConstraintWidthToBoundsIfNecessary(ref layout, window);
var visibleHeight = TableHeight - layout.offscreenHeight;
var canBeDisplayed = visibleHeight >= minHeight;
return(new LayoutResult(layout.x, layout.y, layout.width, layout.offscreenHeight, visibleHeight, canBeDisplayed, Direction));
}
