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List: pass the item height to the constructor instead of the draw function to make it available to event handlers
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@ -37,7 +37,7 @@ drawUI l = [ui]
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box = B.borderWithLabel label $
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hLimit 25 $
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vLimit 15 $
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L.renderList l listDrawElement 1
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L.renderList l listDrawElement
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ui = C.vCenter $ vBox [ C.hCenter box
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, str " "
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, C.hCenter $ str "Press +/- to add/remove list elements."
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@ -68,7 +68,7 @@ listDrawElement sel i =
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in C.hCenter $ str "Item " <+> (selStr $ show i)
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initialState :: L.List Int
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initialState = L.list (T.Name "list") (V.fromList [0, 1, 2])
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initialState = L.list (T.Name "list") (V.fromList [0, 1, 2]) 1
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customAttr :: A.AttrName
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customAttr = L.listSelectedAttr <> "custom"
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@ -4,7 +4,7 @@
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-- | This module provides a scrollable list type and functions for
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-- manipulating and rendering it.
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module Brick.Widgets.List
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( List(listElements, listSelected, listName)
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( List(listElements, listSelected, listName, listItemHeight)
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-- * Consructing a list
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, list
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@ -16,6 +16,7 @@ module Brick.Widgets.List
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, listElementsL
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, listSelectedL
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, listNameL
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, listItemHeightL
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-- * Manipulating a list
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, listMoveBy
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@ -80,22 +81,25 @@ list :: Name
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-- ^ The list name (must be unique)
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-> V.Vector e
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-- ^ The initial list contents
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-> Int
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-- ^ The list item height in rows (all list item widgets must be
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-- this high)
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-> List e
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list name es =
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list name es h =
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let selIndex = if V.null es then Nothing else Just 0
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in List es selIndex name
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in List es selIndex name h
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-- | Turn a list state value into a widget given an item drawing
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-- function. The integer specifies the height, in rows, of the widgets
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-- returned by the item drawing function. All item widgets must be this
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-- many rows high.
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renderList :: List e -> (Bool -> e -> Widget) -> Int -> Widget
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renderList l drawElem itemHeight =
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renderList :: List e -> (Bool -> e -> Widget) -> Widget
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renderList l drawElem =
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withDefAttr listAttr $
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drawListElements l drawElem itemHeight
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drawListElements l drawElem
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drawListElements :: List e -> (Bool -> e -> Widget) -> Int -> Widget
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drawListElements l drawElem itemHeight =
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drawListElements :: List e -> (Bool -> e -> Widget) -> Widget
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drawListElements l drawElem =
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Widget Fixed Fixed $ do
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c <- getContext
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@ -106,9 +110,9 @@ drawListElements l drawElem itemHeight =
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start = max 0 $ idx - numPerHeight + 1
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num = min (numPerHeight * 2) (V.length (l^.listElementsL) - start)
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numPerHeight = (c^.availHeightL) `div` itemHeight
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numPerHeight = (c^.availHeightL) `div` (l^.listItemHeightL)
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off = start * itemHeight
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off = start * (l^.listItemHeightL)
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drawnElements = (flip V.imap) es $ \i e ->
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let isSelected = Just (i + start) == l^.listSelectedL
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