Graphics.Vty.DisplayAttributes

Documentation

fixDisplayAttr :: FixedAttr -> Attr -> FixedAttr

Given the previously applied display attributes as a FixedAttr and the current display attributes as an Attr produces a FixedAttr that represents the current display attributes. This is done by using the previously applied display attributes to remove the KeepCurrent abstraction.

data DisplayAttrDiff

difference between two display attributes. Used in the calculation of the operations required to go from one display attribute to the next.

Previously, vty would reset display attributes to default then apply the new display attributes. This turned out to be very expensive: A *lot* more data would be sent to the terminal than required.

Constructors

DisplayAttrDiff

Fields

• styleDiffs :: [StyleStateChange]
• foreColorDiff :: DisplayColorDiff
• backColorDiff :: DisplayColorDiff

Instances

Show DisplayAttrDiff

Methods

showsPrec :: Int -> DisplayAttrDiff -> ShowS

show :: DisplayAttrDiff -> String

showList :: [DisplayAttrDiff] -> ShowS

Monoid DisplayAttrDiff

Methods

mempty :: DisplayAttrDiff

mappend :: DisplayAttrDiff -> DisplayAttrDiff -> DisplayAttrDiff

mconcat :: [DisplayAttrDiff] -> DisplayAttrDiff

simplifyStyleDiffs :: [StyleStateChange] -> [StyleStateChange] -> [StyleStateChange]

Used in the computation of a final style attribute change.

TODO(corey): not really a simplify but a monoid instance.

simplifyColorDiffs :: DisplayColorDiff -> DisplayColorDiff -> DisplayColorDiff

Consider two display color attributes diffs. What display color attribute diff are these equivalent to?

TODO(corey): not really a simplify but a monoid instance.

data DisplayColorDiff

Difference between two display color attribute changes.

Constructors

ColorToDefault

NoColorChange

SetColor !Color

Instances

Eq DisplayColorDiff

Methods

(==) :: DisplayColorDiff -> DisplayColorDiff -> Bool

(/=) :: DisplayColorDiff -> DisplayColorDiff -> Bool

Show DisplayColorDiff

Methods

showsPrec :: Int -> DisplayColorDiff -> ShowS

show :: DisplayColorDiff -> String

showList :: [DisplayColorDiff] -> ShowS

data StyleStateChange

Style attribute changes are transformed into a sequence of apply/removes of the individual attributes.

Constructors

ApplyStandout

RemoveStandout

ApplyUnderline

RemoveUnderline

ApplyReverseVideo

RemoveReverseVideo

ApplyBlink

RemoveBlink

ApplyDim

RemoveDim

ApplyBold

RemoveBold

Instances

Eq StyleStateChange

Methods

(==) :: StyleStateChange -> StyleStateChange -> Bool

(/=) :: StyleStateChange -> StyleStateChange -> Bool

Show StyleStateChange

Methods

showsPrec :: Int -> StyleStateChange -> ShowS

show :: StyleStateChange -> String

showList :: [StyleStateChange] -> ShowS

displayAttrDiffs :: FixedAttr -> FixedAttr -> DisplayAttrDiff

Determines the diff between two display&color attributes. This diff determines the operations that actually get output to the terminal.

diffColor :: Maybe Color -> Maybe Color -> DisplayColorDiff

diffStyles :: Style -> Style -> [StyleStateChange]