Hails.MVC.View

This class encapsulates GUI apis with some basic common operations: initialise the GUI, destroy the GUI, execute in the GUI Thread, etc.

Documentation

data Null a

Null is a parametric datatype with a non-parametric constructor.

Constructors

Null

class View a where

A Class for View (GUI) managers. GUI managers usually have similar operations: initialise, destroy, run operation in the GUI thread, etc. This class encapsulates all these operations to provide a unique interface.

Methods

initView :: Null a -> IO ()

createView :: IO a

startView :: a -> IO ()

onViewSync :: a -> IO b -> IO b

onViewAsync :: a -> IO () -> IO ()

destroyView :: a -> IO ()

type ViewElementAccessor a b = a -> b

An Element Accessor to access elements of kind b from Views of kind a is a function that takes an a and returns a b.

This type is defined to make signatures shorter and more declarative.

type ViewElementAccessorIO a b = ViewElementAccessor a (IO b)

An Element Accessor to access elements of kind b from Views of kind a is a function that takes an a and returns an IO b.

This is the IO counterpart of the previous type. It is used more often because most element accessors run inside the IO monad.