/*

     File: LayoutSupport.h

 Abstract: Protocol adopted by both PortraitView and LandscapeView.

 Enables ViewController to pass its layout guides to the orientation

 specific views.

  Version: 1.3

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 */

//! Declares the interface for a view controller to forward its top and

//! bottom layout guide heights to an orientation-specific view which adopts

//! this protocol.

//!

//! Technically a part of the view controller, views defined in a storyboard

//! scene can relate constraints to the top layout guide and bottom layout

//! guide of that scene's view controller.  Views defined in a xib have no

//! such feature available to them.

//!

//! We work around this limitation in four parts:

//!     1) PortraitView.xib and LandscapeView.xib both have two extra

//!        subviews: 'Top Layout Guide' and 'Bottom Layout Guide'.  Both of them

//!        are hidden but constraints can still relate to them.

//!     2) PortraitView and LandscapeView define an IBOutlets that are wired to

//!        a height constraints on the 'Top Layout Guide' and

//!        'Bottom Layout Guide' views.

//!     3) PortraitView and Landscape view both adopt this protocol and forward

//!        changes to the two properties declared within it to the constant

//!        of the height constraint of the 'Top Layout Guide' or

//!        'Bottom layout Guide'.

//!     4) In -viewWillLayoutSubviews, ViewController passes the current values

//!        of its topLayoutGuide and bottomLayoutGuide to PortraitView and

//!        LandscapeView via the interface declared by this protocol.

//

@protocol LayoutSupport

@property (nonatomic, readwrite) CGFloat topLayoutGuideLength;

@property (nonatomic, readwrite) CGFloat bottomLayoutGuideLength;

@end