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Eval.elm
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Eval.elm
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module MouseTouch.Eval where
{-| Built-in evaluation functions.
# Evaluation Functions
@docs click', click, start, start', swipeDown, swipeUp, swipeLeft, swipeRight
# Pretty Listeners
@docs onClick
-}
import Html exposing (Attribute)
import Time exposing (Time, millisecond, second)
import MouseTouch exposing
( Device(..), Action(..), PastEvents, EvalFunction
, messageOn)
{-| A click evaluation function which has to be parametrized with the maximum range
between the start and end event (ie. mousedown/mouseup or touchstart/touchend).
Click searches past events for a pattern of mouseend (mousemove{0,5}) mousestart
or touchend (touchmove|mouseevent){0|5} touchstart. The latter ignores virtual
mouse events intermingling with a fast series of touches.
-}
click' : Time -> Time -> PastEvents -> Bool
click' maxRange minLast events =
let
diffTouch =
case events of
((Touch, End), (time1, _))
:: rest ->
case List.filter
(\((d,a),_) -> d == Touch && a /= Move)
rest of
((Touch, Start), (time2, _))
:: rest ->
Just <| time1 - time2
_ -> Nothing
_ -> Nothing
(diffMouse,lastTouch) =
case events of
((Mouse, End), (time1, _))
:: rest ->
case List.filter
(\((d,a),_) -> d == Mouse && a /= Move)
rest of
((Mouse, Start), (time2,_))
:: rest ->
( Just <| time1 - time2,
case List.filter
(\((d,a),_) -> d == Touch)
events of
((Touch, _), (last,_))
:: rest ->
Just <| time2 - last
_ ->
Nothing
)
_ ->
(Nothing,Nothing)
_ ->
(Nothing,Nothing)
in
case diffTouch of
Nothing ->
case (diffMouse,lastTouch) of
(Just d, Nothing) ->
d < maxRange
(Just d, Just l) ->
d < maxRange && l > minLast
_ -> False
Just d ->
d < maxRange
{-| A convenient click evaluation function in the sense of start and end happening
within 300 ms and not past virtual mouse event must exist within the last 700 ms
-}
click : EvalFunction
click =
click' (300*millisecond) (700*millisecond)
{-| A simple mousestart/touchstart evaluation function. Takes the minimum time distance
to the last mouse event.
-}
start' : Time -> PastEvents -> Bool
start' minLast events =
let
(time, last) =
case events of
((d, Start), (time, _))
:: rest ->
(Just time,
if d == Mouse
then
case List.filter
(\((d,a),_) -> d == Touch)
rest of
((Touch,_),(last,_))
:: rest ->
Just last
_ -> Nothing
else
Nothing
)
_ -> (Nothing, Nothing)
in
case time of
Nothing -> False
Just t ->
case Maybe.map ((-) t) last of
Nothing -> True
Just l -> l > minLast
{-| A wrapper around `start'` configured with 700 milliseconds distance to last
mouse event.
-}
start : EvalFunction
start =
start' (700*millisecond)
{-| Evaluating swiping down gesture (touch only)
-}
swipeDown : Int -> Int -> EvalFunction
swipeDown tolerance minSwipeDistance events =
let
ySmaller ((_,action),(_,(_,ynew))) (yold, wasSmaller) =
let
newSmaller =
if action /= Move
then wasSmaller
else wasSmaller && yold > ynew
in
(ynew, newSmaller)
in
case events of
((Touch,End),(_,(xend,yend)))
:: rest ->
case List.foldl ySmaller (9999999,True)
<| List.filter (\((d,_),_) -> d == Touch) rest of
(_, True) ->
case List.filter (\((_,a),_) -> a == Start) rest of
((Touch,Start),(_,(xstart,ystart)))
:: rest ->
abs (xstart - xend) < tolerance
&& abs (ystart - yend) > minSwipeDistance
_ -> False
(_, False) -> False
_ -> False
{-| Evaluating swiping up gesture (touch only)
-}
swipeUp : Int -> Int -> EvalFunction
swipeUp tolerance minSwipeDistance events =
let
yBigger ((_,action),(_,(_,ynew))) (yold, wasSmaller) =
let
newSmaller =
if action /= Move
then wasSmaller
else wasSmaller && yold < ynew
in
(ynew, newSmaller)
in
case events of
((Touch,End),(_,(xend,yend)))
:: rest ->
case List.foldl yBigger (-1,True)
<| List.filter (\((d,_),_) -> d == Touch) rest of
(_, True) ->
case List.filter (\((_,a),_) -> a == Start) rest of
((Touch,Start),(_,(xstart,ystart)))
:: rest ->
abs (xstart - xend) < tolerance
&& abs (ystart - yend) > minSwipeDistance
_ -> False
(_, False) -> False
_ -> False
{-| Evaluating swiping right gesture (touch only)
-}
swipeRight : Int -> Int -> EvalFunction
swipeRight tolerance minSwipeDistance events =
let
xSmaller ((_,action),(_,(xnew,_))) (xold, wasSmaller) =
let
newSmaller =
if action /= Move
then wasSmaller
else wasSmaller && xold > xnew
in
(xnew, newSmaller)
in
case events of
((Touch,End),(_,(xend,yend)))
:: rest ->
case List.foldl xSmaller (9999999,True)
<| List.filter (\((d,_),_) -> d == Touch) rest of
(_, True) ->
case List.filter (\((_,a),_) -> a == Start) rest of
((Touch,Start),(_,(xstart,ystart)))
:: rest ->
abs (xstart - xend) > tolerance
&& abs (ystart - yend) < minSwipeDistance
_ -> False
(_, False) -> False
_ -> False
{-| Evaluating swiping left gesture (touch only)
-}
swipeLeft : Int -> Int -> EvalFunction
swipeLeft tolerance minSwipeDistance events =
let
xBigger ((_,action),(_,(xnew,_))) (xold, wasSmaller) =
let
newSmaller =
if action /= Move
then wasSmaller
else wasSmaller && xold < xnew
in
(xnew, newSmaller)
in
case events of
((Touch,End),(_,(xend,yend)))
:: rest ->
case List.foldl xBigger (-1,True)
<| List.filter (\((d,_),_) -> d == Touch) rest of
(_, True) ->
case List.filter (\((_,a),_) -> a == Start) rest of
((Touch,Start),(_,(xstart,ystart)))
:: rest ->
abs (xstart - xend) > tolerance
&& abs (ystart - yend) < minSwipeDistance
_ -> False
(_, False) -> False
_ -> False
{-| Equivalent for `Html.Events.onClick`
-}
onClick : String -> Signal.Address a -> a -> List Attribute
onClick =
messageOn click second