/// <summary>
/// Sets the left constraint of the current view to the right of the given view.
/// Note: The view given has to have been attached using the Attach method.
/// Any margin of the given view and the current view will be added (no margin collapse).
/// </summary>
/// <returns>The of.</returns>
/// <param name="view">View.</param>
/// <param name="margin">Margin.</param>
/// <param name="priority">Constraint priority.</param>
public ConstraintHelper LeftOf(UIView view, float?margin = null, float?priority = null)
{
ConstraintContainer item = _items.FirstOrDefault(items => (items.View == view));
if (item == null)
{
throw new UnattachedViewException();
}
return(LeftOf(item, margin, priority));
}
/// <summary>
/// Sets the height constraint of the current view to the height of the given view.
/// Note: The view given has to have been attached using the Attach method.
/// You can optionally multiply the views height and/or modify it.
/// </summary>
/// <returns>The of.</returns>
/// <param name="view">View.</param>
/// <param name="multiplier">Multiplier.</param>
/// <param name="modifier">Modifier.</param>
/// <param name="priority">Constraint priority.</param>
public ConstraintHelper HeightOf(UIView view, float multiplier = 1, float modifier = 0, float?priority = null)
{
ConstraintContainer item = _items.FirstOrDefault(items => (items.View == view));
if (item == null)
{
throw new UnattachedViewException();
}
return(HeightOf(item, multiplier, modifier, priority));
}
/// <summary>
/// Sets the current view to work with to the given one.
/// Note: The view has to have been attached previously using the 'Attach' method.
/// </summary>
/// <returns>ConstraintHelper</returns>
/// <param name="view">View.</param>
public ConstraintHelper WorkWith(UIView view)
{
if (_currentItem != null && _currentItem.View == view)
{
return(this);
}
_currentItem = _items.FirstOrDefault(items => (items.View == view));
if (_currentItem == null)
{
throw new UnattachedViewException();
}
return(this);
}
/// <summary>
/// Sets the bottom constraint of the current view to the bottom of the view within the given constraint container.
/// Any margin of the given view and the current view will be added (no margin collapse).
/// </summary>
/// <returns>ConstraintHelper</returns>
/// <param name="container">Container.</param>
/// <param name="margin">Margin.</param>
public ConstraintHelper AboveOf(ConstraintContainer container, float? margin = null)
{
if (margin != null) {
_currentItem.Margin.Bottom = (float)margin;
}
_currentItem.ConstraintBottom = NSLayoutConstraint.Create(
_currentItem.View, NSLayoutAttribute.Bottom,
NSLayoutRelation.Equal,
container.View, NSLayoutAttribute.Top,
1f, 0 - (_currentItem.Margin.Bottom + container.Margin.Top)
);
_view.AddConstraint(_currentItem.ConstraintBottom);
return this;
}
/// <summary>
/// Adds the given view as a subview and the given view as current view to work with
/// </summary>
/// <returns>ConstraintHelper</returns>
/// <param name="view">View.</param>
public ConstraintHelper Attach(UIView view)
{
_currentItem = _items.FirstOrDefault(items => (items.View == view));
if (_currentItem == null) {
view.TranslatesAutoresizingMaskIntoConstraints = false;
_currentItem = new ConstraintContainer(view);
if(view is IConstraintHelpedView) {
_currentItem.Margin = ((IConstraintHelpedView)view).Margin;
}
_view.AddSubview(view);
}
_items.Add(_currentItem);
return this;
}
/// <summary>
/// Sets the height constraint of the current view to the height of the given view.
/// Note: The view given has to have been attached using the Attach method.
/// You can optionally multiply the views height and/or modify it.
/// </summary>
/// <returns>The of.</returns>
/// <param name="container">Container.</param>
/// <param name="multiplier">Multiplier.</param>
/// <param name="modifier">Modifier.</param>
/// <param name="priority">Constraint priority.</param>
public ConstraintHelper HeightOf(ConstraintContainer container, float multiplier = 1, float modifier = 0, float?priority = null)
{
_currentItem.ConstraintHeight = NSLayoutConstraint.Create(
_currentItem.View, NSLayoutAttribute.Height,
NSLayoutRelation.Equal,
container.View, NSLayoutAttribute.Height,
multiplier, modifier
);
if (priority != null)
{
_currentItem.ConstraintHeight.Priority = (float)priority;
}
_view.AddConstraint(_currentItem.ConstraintHeight);
return(this);
}
/// <summary>
/// Removes all views and related constraints added through the ConstraintHelper object.
/// </summary>
/// <returns>ConstraintHelper</returns>
public ConstraintHelper RemoveAll()
{
foreach (var item in _items)
{
var constraints = item.GetAllConstraints();
if (constraints.Count > 0)
{
_view.RemoveConstraints(constraints.ToArray());
item.EmptyConstraints();
}
item.View.RemoveFromSuperview();
}
_items = new List <ConstraintContainer>();
_currentItem = null;
return(this);
}
/// <summary>
/// Adds the given view as a subview and the given view as current view to work with
/// </summary>
/// <returns>ConstraintHelper</returns>
/// <param name="view">View.</param>
public ConstraintHelper Attach(UIView view)
{
_currentItem = _items.FirstOrDefault(items => (items.View == view));
if (_currentItem == null)
{
view.TranslatesAutoresizingMaskIntoConstraints = false;
_currentItem = new ConstraintContainer(view);
if (view is IConstraintHelpedView)
{
_currentItem.Margin = ((IConstraintHelpedView)view).Margin;
}
_view.AddSubview(view);
}
_items.Add(_currentItem);
return(this);
}
/// <summary>
/// Removes the currently selected view and all related constraints from the parent view.
/// </summary>
/// <returns>ConstraintHelper</returns>
public ConstraintHelper Remove()
{
if (_currentItem == null)
{
throw new UnattachedViewException();
}
var constraints = _currentItem.GetAllConstraints();
if (constraints.Count > 0)
{
_view.RemoveConstraints(constraints.ToArray());
_currentItem.EmptyConstraints();
}
_currentItem.View.RemoveFromSuperview();
_items.Remove(_currentItem);
_currentItem = null;
return(this);
}
/// <summary>
/// Sets the bottom constraint of the current view to the bottom of the view within the given constraint container.
/// Any margin of the given view and the current view will be added (no margin collapse).
/// </summary>
/// <returns>ConstraintHelper</returns>
/// <param name="container">Container.</param>
/// <param name="margin">Margin.</param>
/// <param name="priority">Constraint priority.</param>
public ConstraintHelper AboveOf(ConstraintContainer container, float?margin = null, float?priority = null)
{
if (margin != null)
{
_currentItem.Margin.Bottom = (float)margin;
}
_currentItem.ConstraintBottom = NSLayoutConstraint.Create(
_currentItem.View, NSLayoutAttribute.Bottom,
NSLayoutRelation.Equal,
container.View, NSLayoutAttribute.Top,
1f, 0 - (_currentItem.Margin.Bottom + container.Margin.Top)
);
if (priority != null)
{
_currentItem.ConstraintBottom.Priority = (float)priority;
}
_view.AddConstraint(_currentItem.ConstraintBottom);
return(this);
}
/// <summary>
/// Sets the left constraint of the current view to the right of the view within the given constraint container.
/// Any margin of the given view and the current view will be added (no margin collapse).
/// </summary>
/// <returns>The of.</returns>
/// <param name="container">Container.</param>
/// <param name="margin">Margin.</param>
/// <param name="priority">Constraint priority.</param>
public ConstraintHelper LeftOf(ConstraintContainer container, float?margin = null, float?priority = null)
{
if (margin != null)
{
_currentItem.Margin.Left = (float)margin;
}
_currentItem.ConstraintLeft = NSLayoutConstraint.Create(
_currentItem.View, NSLayoutAttribute.Left,
NSLayoutRelation.Equal,
container.View, NSLayoutAttribute.Right,
1f, _currentItem.Margin.Left + container.Margin.Right
);
if (priority != null)
{
_currentItem.ConstraintLeft.Priority = (float)priority;
}
_view.AddConstraint(_currentItem.ConstraintLeft);
return(this);
}
/// <summary>
/// Resets the top stack.
/// </summary>
/// <returns>The top stack.</returns>
public ConstraintHelper ResetTopStack()
{
_lastTop = null;
return this;
}
/// <summary>
/// Resets the left stack.
/// </summary>
/// <returns>The left stack.</returns>
public ConstraintHelper ResetLeftStack()
{
_lastLeft = null;
return(this);
}
/// <summary>
/// Resets the bottom stack.
/// </summary>
/// <returns>The bottom stack.</returns>
public ConstraintHelper ResetBottomStack()
{
_lastBottom = null;
return(this);
}
/// <summary>
/// Resets the right stack.
/// </summary>
/// <returns>The right stack.</returns>
public ConstraintHelper ResetRightStack()
{
_lastRight = null;
return(this);
}
/// <summary>
/// Sets the current view to be the last view in the right stack.
/// Every following right constraint will be right of this current view.
/// </summary>
/// <returns>The top.</returns>
public ConstraintHelper StackRight()
{
_lastRight = _currentItem;
return this;
}
/// <summary>
/// Resets the bottom stack.
/// </summary>
/// <returns>The bottom stack.</returns>
public ConstraintHelper ResetBottomStack()
{
_lastBottom = null;
return this;
}
/// <summary>
/// Removes all views and related constraints added through the ConstraintHelper object.
/// </summary>
/// <returns>ConstraintHelper</returns>
public ConstraintHelper RemoveAll()
{
foreach (var item in _items) {
var constraints = item.GetAllConstraints();
if (constraints.Count > 0) {
_view.RemoveConstraints(constraints.ToArray());
item.EmptyConstraints();
}
item.View.RemoveFromSuperview();
}
_items = new List<ConstraintContainer>();
_currentItem = null;
return this;
}
/// <summary>
/// Sets the right constraint of the current view to the left of the view within the given constraint container.
/// Any margin of the given view and the current view will be added (no margin collapse).
/// </summary>
/// <returns>The of.</returns>
/// <param name="container">Container.</param>
/// <param name="margin">Margin.</param>
public ConstraintHelper RightOf(ConstraintContainer container, float? margin = null)
{
if (margin != null) {
_currentItem.Margin.Right = (float)margin;
}
_currentItem.ConstraintRight = NSLayoutConstraint.Create(
_currentItem.View, NSLayoutAttribute.Right,
NSLayoutRelation.Equal,
container.View, NSLayoutAttribute.Left,
1f, 0 - (_currentItem.Margin.Right + container.Margin.Left)
);
_view.AddConstraint(_currentItem.ConstraintRight);
return this;
}
/// <summary>
/// Sets the current view to work with to the given one.
/// Note: The view has to have been attached previously using the 'Attach' method.
/// </summary>
/// <returns>ConstraintHelper</returns>
/// <param name="view">View.</param>
public ConstraintHelper WorkWith(UIView view)
{
if (_currentItem != null && _currentItem.View == view) { return this; }
_currentItem = _items.FirstOrDefault(items => (items.View == view));
if (_currentItem == null) { throw new UnattachedViewException(); }
return this;
}
/// <summary>
/// Sets the current view to be the last view in the bottom stack.
/// Every following bottom constraint will be above of this current view.
/// </summary>
/// <returns>The bottom.</returns>
public ConstraintHelper StackBottom()
{
_lastBottom = _currentItem;
return this;
}
/// <summary>
/// Sets the width constraint of the current view to the width of the given view.
/// Note: The view given has to have been attached using the Attach method.
/// You can optionally multiply the views width and/or modify it.
/// </summary>
/// <returns>The of.</returns>
/// <param name="container">Container.</param>
/// <param name="multiplier">Multiplier.</param>
/// <param name="modifier">Modifier.</param>
public ConstraintHelper WidthOf(ConstraintContainer container, float multiplier = 1, float modifier = 0)
{
_currentItem.ConstraintWidth = NSLayoutConstraint.Create(
_currentItem.View, NSLayoutAttribute.Width,
NSLayoutRelation.Equal,
container.View, NSLayoutAttribute.Width,
multiplier, modifier
);
_view.AddConstraint(_currentItem.ConstraintWidth);
return this;
}
/// <summary>
/// Sets the current view to be the last view in the top stack.
/// Every following top constraint will be below this current view.
/// </summary>
/// <returns>The top.</returns>
public ConstraintHelper StackTop()
{
_lastTop = _currentItem;
return this;
}
/// <summary>
/// Sets the current view to be the last view in the bottom stack.
/// Every following bottom constraint will be above of this current view.
/// </summary>
/// <returns>The bottom.</returns>
public ConstraintHelper StackBottom()
{
_lastBottom = _currentItem;
return(this);
}
/// <summary>
/// Resets the right stack.
/// </summary>
/// <returns>The right stack.</returns>
public ConstraintHelper ResetRightStack()
{
_lastRight = null;
return this;
}
/// <summary>
/// Sets the current view to be the last view in the left stack.
/// Every following left constraint will be left of this current view.
/// </summary>
/// <returns>The left.</returns>
public ConstraintHelper StackLeft()
{
_lastLeft = _currentItem;
return(this);
}
/// <summary>
/// Resets the left stack.
/// </summary>
/// <returns>The left stack.</returns>
public ConstraintHelper ResetLeftStack()
{
_lastLeft = null;
return this;
}
/// <summary>
/// Resets the top stack.
/// </summary>
/// <returns>The top stack.</returns>
public ConstraintHelper ResetTopStack()
{
_lastTop = null;
return(this);
}
/// <summary>
/// Sets the current view to be the last view in the top stack.
/// Every following top constraint will be below this current view.
/// </summary>
/// <returns>The top.</returns>
public ConstraintHelper StackTop()
{
_lastTop = _currentItem;
return(this);
}
/// <summary>
/// Sets the current view to be the last view in the left stack.
/// Every following left constraint will be left of this current view.
/// </summary>
/// <returns>The left.</returns>
public ConstraintHelper StackLeft()
{
_lastLeft = _currentItem;
return this;
}
/// <summary>
/// Sets the current view to be the last view in the right stack.
/// Every following right constraint will be right of this current view.
/// </summary>
/// <returns>The top.</returns>
public ConstraintHelper StackRight()
{
_lastRight = _currentItem;
return(this);
}
/// <summary>
/// Removes the currently selected view and all related constraints from the parent view.
/// </summary>
/// <returns>ConstraintHelper</returns>
public ConstraintHelper Remove()
{
if (_currentItem == null) { throw new UnattachedViewException(); }
var constraints = _currentItem.GetAllConstraints();
if(constraints.Count > 0) {
_view.RemoveConstraints(constraints.ToArray());
_currentItem.EmptyConstraints();
}
_currentItem.View.RemoveFromSuperview();
_items.Remove(_currentItem);
_currentItem = null;
return this;
}