-- | The RangeSlider is a slider component with two knobs, allowing -- | the user to specify both a minimum and maximum value to filter -- | data by. It may be dragged with the mouse or moved with the -- | keyboard like a regular slider component. The RangeSlider is -- | designed to let the user adjust in multiples of a provided -- | epsilon (smallest difference) module Gargantext.Components.RangeSlider where import Data.Generic.Rep (class Generic) import Data.Eq.Generic (genericEq) import Data.Int (fromNumber) import Data.Maybe (Maybe(..), fromMaybe) import Data.Nullable (Nullable, null) import Data.Traversable (traverse_) import DOM.Simple as DOM import DOM.Simple.Document (document) import DOM.Simple.Event as Event import DOM.Simple.EventListener as EL import DOM.Simple (DOMRect) import Global (toFixed) import Effect (Effect) import Math as M import Reactix as R import Reactix.DOM.HTML as H import Toestand as T import Gargantext.Prelude import Gargantext.Utils.Math (roundToMultiple) import Gargantext.Utils.Range as Range import Gargantext.Utils.Reactix as R2 here :: R2.Here here = R2.here "Gargantext.Components.RangeSlider" -- data Axis = X | Y type Bounds = Range.NumberRange type Epsilon = Number -- To avoid overloading the terms 'min' and 'max' here, we treat 'min' -- and 'max' as being the bounds of the scale and 'low' and 'high' as -- being the selected values type Props = ( bounds :: Bounds -- The minimum and maximum values it is possible to select , initialValue :: Range.NumberRange -- The user's selection of minimum and maximum values , epsilon :: Number -- The smallest possible change (for mouse) , step :: Number -- The 'standard' change (for keyboard) -- , axis :: Axis -- Which direction to move in , width :: Number , height :: Number , onChange :: Range.NumberRange -> Effect Unit ) rangeSlider :: Record Props -> R.Element rangeSlider props = R.createElement rangeSliderCpt props [] data Knob = MinKnob | MaxKnob derive instance Generic Knob _ instance Eq Knob where eq = genericEq data RangeUpdate = SetMin Number | SetMax Number rangeSliderCpt :: R.Component Props rangeSliderCpt = here.component "rangeSlider" cpt where cpt props _ = do -- rounding precision (i.e. how many decimal digits are in epsilon) let precision = fromMaybe 0 $ fromNumber $ max 0.0 $ - M.floor $ (M.log props.epsilon) / M.ln10 -- scale bar scaleElem <- (R.useRef null) :: R.Hooks (R.Ref (Nullable DOM.Element)) -- dom ref -- scale sel bar scaleSelElem <- (R.useRef null) :: R.Hooks (R.Ref (Nullable DOM.Element)) -- dom ref -- low knob lowElem <- (R.useRef null) :: R.Hooks (R.Ref (Nullable DOM.Element)) -- a dom ref to the low knob -- high knob highElem <- (R.useRef null) :: R.Hooks (R.Ref (Nullable DOM.Element)) -- a dom ref to the high knob -- The value of the user's selection value <- T.useBox $ initialValue props value' <- T.useLive T.unequal value -- the knob we are currently in a drag for. set by mousedown on a knob dragKnob <- T.useBox (Nothing :: Maybe Knob) dragKnob' <- T.useLive T.unequal dragKnob -- the handler functions for trapping mouse events, so they can be removed mouseMoveHandler <- (R.useRef $ Nothing) :: R.Hooks (R.Ref (Maybe (EL.Callback Event.MouseEvent))) mouseUpHandler <- (R.useRef $ Nothing) :: R.Hooks (R.Ref (Maybe (EL.Callback Event.MouseEvent))) let destroy = \_ -> do destroyEventHandler "mousemove" mouseMoveHandler destroyEventHandler "mouseup" mouseUpHandler R.setRef mouseMoveHandler $ Nothing R.setRef mouseUpHandler $ Nothing R2.useLayoutEffect1' dragKnob' $ \_ -> do let scalePos = R2.readPositionRef scaleElem let lowPos = R2.readPositionRef lowElem let highPos = R2.readPositionRef highElem case dragKnob' of Just knob -> do let drag = (getDragScale knob scalePos lowPos highPos) :: Maybe Range.NumberRange let onMouseMove = EL.callback $ \(event :: Event.MouseEvent) -> do case reproject drag scalePos props.bounds props.epsilon (R2.domMousePosition event) of Just val -> do setKnob knob value value' val props.onChange $ knobSetter knob value' val Nothing -> destroy unit let onMouseUp = EL.callback $ \(_event :: Event.MouseEvent) -> do --props.onChange $ knobSetter knob value val T.write_ Nothing dragKnob destroy unit EL.addEventListener document "mousemove" onMouseMove EL.addEventListener document "mouseup" onMouseUp R.setRef mouseMoveHandler $ Just onMouseMove R.setRef mouseUpHandler $ Just onMouseUp Nothing -> destroy unit pure $ H.div { className, aria } [ renderScale scaleElem props value' , renderScaleSel scaleSelElem props value' , renderKnob MinKnob lowElem value' props.bounds dragKnob precision , renderKnob MaxKnob highElem value' props.bounds dragKnob precision ] className = "range-slider" aria = { label: "Range Slider Control. Expresses filtering data by a minimum and maximum value range through two slider knobs. Knobs can be adjusted with the arrow keys." } destroyEventHandler :: forall e . Event.IsEvent e => String -> R.Ref (Maybe (EL.Callback e)) -> Effect Unit destroyEventHandler name ref = traverse_ destroy $ R.readRef ref where destroy handler = do EL.removeEventListener document name handler R.setRef ref Nothing setKnob :: Knob -> T.Box Range.NumberRange -> Range.NumberRange -> Number -> Effect Unit setKnob knob value r val = T.write_ (knobSetter knob r val) value knobSetter :: Knob -> Range.NumberRange -> Number -> Range.NumberRange knobSetter MinKnob = Range.withMin knobSetter MaxKnob = Range.withMax getDragScale :: Knob -> Maybe DOMRect -> Maybe DOMRect -> Maybe DOMRect -> Maybe Range.NumberRange getDragScale knob scalePos lowPos highPos = do scale <- scalePos low <- lowPos high <- highPos pure $ Range.Closed { min: min knob scale low, max: max knob scale high } where min MinKnob scale _ = scale.left min MaxKnob _ low = low.left max MinKnob _ high = high.left max MaxKnob scale _ = scale.right renderScale :: R.Ref (Nullable DOM.Element) -> Record Props -> Range.NumberRange -> R.Element renderScale ref {width,height} (Range.Closed {min, max}) = H.div { ref, className, width, height, aria } [] where className = "range-slider__scale" aria = { label: "Scale running from " <> show min <> " to " <> show max } renderScaleSel :: R.Ref (Nullable DOM.Element) -> Record Props -> Range.NumberRange -> R.Element renderScaleSel ref props (Range.Closed {min, max}) = H.div { ref, className, style} [] where className = "range-slider__scale-sel" style = {left: computeLeft, width: computeWidth} percOffsetMin = Range.normalise props.bounds min percOffsetMax = Range.normalise props.bounds max computeLeft = (show $ 100.0 * percOffsetMin) <> "%" computeWidth = (show $ 100.0 * (percOffsetMax - percOffsetMin)) <> "%" renderKnob :: Knob -> R.Ref (Nullable DOM.Element) -> Range.NumberRange -> Bounds -> T.Box (Maybe Knob) -> Int -> R.Element renderKnob knob ref (Range.Closed value) bounds set precision = H.div { ref, tabIndex, className, aria, on: { mouseDown: onMouseDown }, style } [ H.div { className: "range-slider__placeholder" } [ H.text $ text $ toFixed precision val ] ] where text (Just num) = num text Nothing = "error" tabIndex = 0 className = "range-slider__knob" aria = { label: labelPrefix knob <> "value: " <> show val } labelPrefix MinKnob = "Minimum " labelPrefix MaxKnob = "Maximum " onMouseDown _ = T.write_ (Just knob) set percOffset = Range.normalise bounds val style = { left: (show $ 100.0 * percOffset) <> "%" } val = case knob of MinKnob -> value.min MaxKnob -> value.max -- TODO round to nearest epsilon reproject :: Maybe Range.NumberRange -> Maybe DOMRect -> Bounds -> Epsilon -> R2.Point -> Maybe Number reproject drag scalePos bounds epsilon (R2.Point mousePos) = do drag_ <- drag scale_ <- rectRange <$> scalePos let normal = Range.normalise scale_ (Range.clamp drag_ mousePos.x) let val = Range.projectNormal bounds normal pure $ round epsilon bounds val rectRange :: DOMRect -> Range.NumberRange rectRange rect = Range.Closed { min, max } where min = rect.left max = rect.right initialValue :: Record Props -> Range.NumberRange initialValue props = roundRange props.epsilon props.bounds props.initialValue round :: Epsilon -> Bounds -> Number -> Number round epsilon bounds = roundToMultiple epsilon <<< Range.clamp bounds roundRange :: Epsilon -> Bounds -> Range.NumberRange -> Range.NumberRange roundRange epsilon bounds (Range.Closed initial) = Range.Closed { min, max } where min = round epsilon bounds initial.min max = round epsilon bounds initial.max