Graphics.UI.Threepenny.Widgets

Synopsis

Widgets are reusable building blocks for a graphical user interface. This module collects useful widgets that are designed to work with functional reactive programming (FRP).

For more details and information on how to write your own widgets, see the <https:github.comHeinrichApfelmusthreepenny-guiblobmasterdocdesign-widgets.md widget design guide>.

Tidings

data Tidings a

Data type representing a behavior (facts) and suggestions to change it (rumors).

Instances

Functor Tidings

Applicative Tidings

The applicative instance combines rumors and uses facts when some of the rumors are not available.

rumors :: Tidings a -> Event a

facts :: Tidings a -> Behavior a

tidings :: Behavior a -> Event a -> Tidings a

Smart constructor. Combine facts and rumors into Tidings.

Widgets

Input widgets

data TextEntry

A single-line text entry.

Instances

Widget TextEntry

entry

Arguments

:: Behavior String

Display value when the element does not have focus.

-> UI TextEntry

Create a single-line text entry.

userText :: TextEntry -> Tidings String

User changes to the text value.

ListBox

data ListBox a

A list of values. The user can select entries.

Instances

Widget (ListBox a)

listBox

Arguments

:: forall a . Ord a

=> Behavior [a]

list of items

-> Behavior (Maybe a)

selected item

-> Behavior (a -> UI Element)

display for an item

-> UI (ListBox a)

Create a ListBox.

userSelection :: ListBox a -> Tidings (Maybe a)

User changes to the current selection (possibly empty).