Andreas Reinhold / reiniandClaude Opus 5
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Standard, centered and range sliders on native range inputs, drawn as Compose draws them, in five sizes with ticks, value labels and inset icons. Completes Phase 6. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01V9NnLxnPp8vaaurb3Z1MFy
574 lines
22 KiB
JavaScript
574 lines
22 KiB
JavaScript
/**
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* `materialSlider`: draws `<x-slider>`, M3 Expressive's slider, over its native range inputs —
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* the track, split around each handle, the stop indicators, the tick marks, the handle and its
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* value label, and the inset icon — the way androidx Compose Material 3 draws them.
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*
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* The inputs stay the control. Keyboard, forms, `wire:model`, `x-model` and assistive technology
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* all talk to them; this only reads their values and paints. A pointer is the one thing handled
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* here rather than natively, so that a press lands where Compose puts it in every engine (a
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* native range thumb is sized, hit-tested and dragged differently in each): a press moves the
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* nearest handle to the pointer, snapped to the step, a drag follows it, and every change is an
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* `input` event on the input, with `change` on release — what a native drag sends. A touch waits
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* for a sideways move, or a tap, so scrolling past a slider never changes it.
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*
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* The server draws the first frame. The drawing is `wire:ignore`: a value that Livewire or
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* Alpine writes into an input (`input.value = …`, which fires no event) is caught on the input's
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* own `value` setter, and attribute changes by a MutationObserver.
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*
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* - Range: the handles never cross; an input that would pass the other is held at its value
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* before any listener (x-model, wire:model) reads it.
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* - PageUp and PageDown move by Compose's page: a tenth of the steps, at least one and at most
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* ten (arrows, Home and End are the inputs' own).
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* - Ticks hide while they would sit closer than 8px (Material Components' tick_min_spacing).
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*
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* ---------------------------------------------------------------------------------------
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* Ported from androidx (https://github.com/androidx/androidx), commit
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* 27cf9a7d5788aa0f5f2d8b6699ce279560daf326:
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*
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* compose/material3/material3/src/commonMain/kotlin/androidx/compose/material3/Slider.kt
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* (SliderImpl and RangeSliderImpl layout, SliderDefaults.drawTrack, ThumbContent,
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* slideOnKeyEvents, RangeSliderLogic.captureThumb)
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* compose/material3/material3/src/commonMain/kotlin/androidx/compose/material3/tokens/SliderTokens.kt
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*
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* with the Expressive sizes from Material Components for Android's slider tokens
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* (md.comp.slider.xsmall … xlarge, lib/java/com/google/android/material/slider/res/values/tokens.xml).
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*
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* Copyright 2023-2025 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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* ---------------------------------------------------------------------------------------
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*/
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// Tokens ---------------------------------------------------------------------------------
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/**
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* Track height and corner per size (md.comp.slider.*). XS is Compose's default track, whose
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* corner is half its height and whose segments vanish rather than shrink; the larger sizes pass a
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* `trackCornerSize`, which shrinks a segment's corners as it narrows (enableCornerShrinking).
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*/
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const SIZES = {
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xs: { corner: 8, shrink: false, icon: 0 },
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sm: { corner: 8, shrink: true, icon: 0 },
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md: { corner: 12, shrink: true, icon: 24 },
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lg: { corner: 16, shrink: true, icon: 24 },
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xl: { corner: 28, shrink: true, icon: 32 },
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}
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/** SliderTokens.HandleWidth: the handle's box, which the gap is measured from even while it narrows. */
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const HANDLE_WIDTH = 4
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/** SliderTokens.ActiveHandleLeadingSpace: ThumbTrackGapSize. */
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const GAP = 6
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/** TrackInsideCornerSize. */
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const INSIDE_CORNER = 2
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/** The inset icon's padding from its segment's end (m3_slider_track_icon_padding, SliderWithTrackIconsSample). */
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const ICON_PADDING = 10
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/** Material Components' tick_min_spacing. */
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const TICK_MIN_SPACING = 8
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/** How far a touch moves sideways before it is a drag rather than the start of a scroll. */
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const TOUCH_SLOP = 8
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const VALUE = Object.getOwnPropertyDescriptor(HTMLInputElement.prototype, 'value')
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const VALUE_AS_NUMBER = Object.getOwnPropertyDescriptor(HTMLInputElement.prototype, 'valueAsNumber')
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const clamp = (value, min, max) => Math.min(Math.max(value, min), max)
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const near = (a, b) => Math.abs(a - b) < 1e-6
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const within = (x, [from, to]) => x >= from && x <= to
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/**
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* Where the track's parts go, in pixels from the start of a track `width` wide: SliderImpl's and
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* RangeSliderImpl's handle placement and SliderDefaults.drawTrack, for a horizontal, left-to-right
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* slider (right-to-left mirrors the drawing as a whole).
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*
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* @returns {{ segments: Object<string, {from: number, to: number, startRadius: number, endRadius: number}>, stops: Object<string, number>, ticks: Array<{x: number, active: boolean}|null>, handles: number[], activeTrack: number[], endTrackStart: number|null }}
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*/
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function sliderGeometry({ width, size, fractions, centered = false, range = false, tickFractions = [] }) {
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const { corner, shrink } = SIZES[size] ?? SIZES.xs
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const discrete = tickFractions.length > 0
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const onFirstOrLastStep = (fraction) => near(fraction, tickFractions[0]) || near(fraction, tickFractions.at(-1))
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// SliderImpl: a discrete handle off the ends sits between the corners, where the ticks are.
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const place = (fraction) => (discrete && !onFirstOrLastStep(fraction) ? (width - corner * 2) * fraction + corner : width * fraction)
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const activeRangeStart = range ? fractions[0] : 0
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const activeRangeEnd = range ? fractions[1] : fractions[0]
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const sliderValueStart = place(activeRangeStart)
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const sliderValueEnd = place(activeRangeEnd)
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// TrackImpl: a centred track has a handle on only one side of its centre.
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let startThumbWidth = HANDLE_WIDTH
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let endThumbWidth = HANDLE_WIDTH
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let startGapSize = GAP
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if (!range) {
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const before = fractions[0] < 0.5
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const after = fractions[0] > 0.5
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startThumbWidth = centered && !after ? HANDLE_WIDTH : 0
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endThumbWidth = centered ? (before ? 0 : HANDLE_WIDTH) : HANDLE_WIDTH
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startGapSize = centered ? GAP : 0
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}
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const startGap = startGapSize > 0 ? startThumbWidth / 2 + startGapSize : 0
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const endGap = endThumbWidth / 2 + GAP
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const centerAxis = width / 2
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const cornerThreshold = !shrink || discrete ? corner : 0
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const segments = {}
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const stops = {}
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// The inactive track before the active one (centred and range sliders).
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const adjustedSliderValueEnd = centered ? Math.min(sliderValueEnd, centerAxis) : sliderValueStart
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if ((centered || range) && adjustedSliderValueEnd > startGap + cornerThreshold) {
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segments.start = { from: 0, to: adjustedSliderValueEnd - startGap, startRadius: corner, endRadius: INSIDE_CORNER }
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stops.start = corner
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}
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// The inactive track after it.
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const adjustedSliderValueStart = centered ? Math.max(sliderValueEnd, centerAxis) : sliderValueEnd
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if (adjustedSliderValueStart < width - endGap - cornerThreshold) {
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segments.end = { from: adjustedSliderValueStart + endGap, to: width, startRadius: INSIDE_CORNER, endRadius: corner }
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stops.end = width - corner
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}
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// The active track.
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const activeTrackStart = centered
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? adjustedSliderValueEnd + (adjustedSliderValueEnd < centerAxis ? startGap : 0)
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: range
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? sliderValueStart + startGap
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: 0
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const activeTrackEnd = centered ? adjustedSliderValueStart - (adjustedSliderValueStart > centerAxis ? endGap : 0) : sliderValueEnd - endGap
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const activeStartRadius = centered || range ? INSIDE_CORNER : corner
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if (activeTrackEnd - activeTrackStart > (!shrink || discrete ? activeStartRadius : 0)) {
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segments.active = { from: activeTrackStart, to: activeTrackEnd, startRadius: activeStartRadius, endRadius: INSIDE_CORNER }
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}
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// Ticks, between the corners; none on a stop indicator or in a gap.
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const activeTrack = [activeTrackStart, activeTrackEnd]
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const centreGap = sliderValueEnd > centerAxis ? startGap : endGap
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const valueGap = centered ? (sliderValueEnd > centerAxis ? endGap : startGap) : endGap
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const tickCenterGap = [centerAxis - centreGap, centerAxis + centreGap]
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const tickStartGap = [sliderValueStart - startGap, sliderValueStart + startGap]
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const tickEndGap = [sliderValueEnd - valueGap, sliderValueEnd + valueGap]
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const ticks = tickFractions.map((tick, index) => {
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if (((centered || range) && index === 0) || index === tickFractions.length - 1) {
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return null
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}
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const x = corner + (width - corner * 2) * tick
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if ((centered && within(x, tickCenterGap)) || (range && within(x, tickStartGap)) || within(x, tickEndGap)) {
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return null
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}
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return { x, active: within(x, activeTrack) }
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})
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return {
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segments,
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stops,
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ticks,
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handles: (range ? fractions : [fractions[0]]).map(place),
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activeTrack,
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endTrackStart: segments.end ? segments.end.from : null,
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}
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}
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// The component ----------------------------------------------------------------------------
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/**
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* One slider's behaviour, bound to its root (the element with `x-data`). Everything it keeps is
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* a local here rather than Alpine data: x-model writes an input's value from inside a reactive
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* effect, and anything reactive read or written on the way to the drawing would re-run it.
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*/
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function slider(root) {
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const inputs = [...root.querySelectorAll(':scope > input[type="range"]')]
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const drawing = root.querySelector('[data-slider-drawing]')
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const range = inputs.length > 1
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const cleanups = []
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let queued = false
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let release = null
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// Focus this script gave an input on a press, which draws no ring until a key is pressed.
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let focusedByPointer = null
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const listen = (target, type, handler, capture = false) => {
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target.addEventListener(type, handler, capture)
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cleanups.push(() => target.removeEventListener(type, handler, capture))
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}
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/** The inputs' min, max and step, as a native range reads them; `step` is null for `any`. */
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const bounds = () => {
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const input = inputs[0]
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const parsed = (attribute, fallback) => (Number.isFinite(Number.parseFloat(input[attribute])) ? Number.parseFloat(input[attribute]) : fallback)
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const min = parsed('min', 0)
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const max = parsed('max', 100)
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const step = parsed('step', 1)
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return { min, max: max > min ? max : min + 100, step: input.step === 'any' ? null : step > 0 ? step : 1 }
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}
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const values = () => inputs.map((input) => Number.parseFloat(input.value))
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const thumbOf = (input) => drawing?.querySelector(`[data-handle="${inputs.indexOf(input) === 1 ? 'end' : 'start'}"]`)
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const tickFractions = () => [...(drawing?.querySelectorAll('[data-tick]') ?? [])].map((tick) => Number.parseFloat(tick.dataset.tick))
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const geometry = (width) => {
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const { min, max } = bounds()
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return sliderGeometry({
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width,
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size: root.dataset.size,
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fractions: values().map((value) => (Number.isFinite(value) ? clamp((value - min) / (max - min), 0, 1) : 0)),
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centered: root.hasAttribute('data-centered'),
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range,
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tickFractions: tickFractions(),
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})
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}
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const draw = () => {
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if (!drawing) {
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return
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}
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const width = Math.max(root.clientWidth - HANDLE_WIDTH, 0)
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const size = SIZES[root.dataset.size] ?? SIZES.xs
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const { segments, stops, ticks, handles, activeTrack, endTrackStart } = geometry(width)
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const part = (selector) => drawing.querySelector(selector)
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const px = (number) => `${Math.round(number * 100) / 100}px`
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for (const name of ['start', 'active', 'end']) {
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const element = part(`[data-segment="${name}"]`)
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const segment = segments[name]
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if (element) {
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element.hidden = !segment
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if (segment) {
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const { from, to, startRadius: start, endRadius: end } = segment
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element.style.cssText = `left: ${px(from)}; width: ${px(to - from)}; border-radius: ${px(start)} ${px(end)} ${px(end)} ${px(start)}`
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}
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}
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}
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for (const name of ['start', 'end']) {
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const element = part(`[data-stop="${name}"]`)
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if (element) {
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element.hidden = stops[name] === undefined
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element.style.left = stops[name] === undefined ? '' : px(stops[name])
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}
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}
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const fractions = tickFractions()
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const spacing = fractions.length > 1 ? (width - size.corner * 2) * Math.abs(fractions[1] - fractions[0]) : Infinity
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drawing.querySelectorAll('[data-tick]').forEach((element, i) => {
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const tick = ticks[i]
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element.hidden = !tick || spacing < TICK_MIN_SPACING
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if (tick) {
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element.style.left = px(tick.x)
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element.toggleAttribute('data-active', tick.active)
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}
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})
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handles.forEach((x, i) => {
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const thumb = part(`[data-handle="${i === 1 ? 'end' : 'start'}"]`)
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const label = thumb?.querySelector('[data-value-label]')
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if (thumb) {
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thumb.style.left = px(x)
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}
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if (label && label.textContent !== inputs[i].value) {
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label.textContent = inputs[i].value
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}
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})
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// The inset icon: at the start of the active track while it fits, else of the inactive one.
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const icon = part('[data-track-icon]')
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if (icon) {
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const room = size.icon + ICON_PADDING * 2
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const inActive = Boolean(segments.active) && activeTrack[1] - activeTrack[0] >= room
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const inInactive = !inActive && endTrackStart !== null && width - endTrackStart >= room
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icon.hidden = !inActive && !inInactive
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icon.toggleAttribute('data-active', inActive)
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icon.style.left = px((inActive ? activeTrack[0] : (endTrackStart ?? 0)) + ICON_PADDING)
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}
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}
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const schedule = () => {
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if (!queued) {
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queued = true
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queueMicrotask(() => {
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queued = false
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draw()
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})
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}
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}
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/** A value on the step grid, inside the bounds. */
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const snap = (raw) => {
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const { min, max, step } = bounds()
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if (step === null) {
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return clamp(raw, min, max)
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}
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const decimals = Math.max(...[step, min].map((number) => (String(number).split('.')[1] ?? '').length))
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const top = min + Math.floor((max - min) / step + 1e-9) * step
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return Number(clamp(min + Math.round((raw - min) / step) * step, min, top).toFixed(decimals))
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}
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/** Set one input and tell its listeners, as a native change would. */
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const commit = (index, raw) => {
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const input = inputs[index]
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let value = snap(raw)
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if (range) {
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const other = Number.parseFloat(inputs[1 - index].value)
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value = index === 0 ? Math.min(value, other) : Math.max(value, other)
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}
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if (Number.parseFloat(input.value) === value) {
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return false
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}
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input.value = String(value)
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input.dispatchEvent(new Event('input', { bubbles: true }))
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return true
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}
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/** Whether a handle shows keyboard focus: narrowed, ringed and labelled. */
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const showFocus = (input, shown) => thumbOf(input)?.toggleAttribute('data-focused', shown)
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/** Compose narrows a handle and shows its label while it is pressed or dragged. */
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const pressed = (index) => drawing?.querySelectorAll('[data-handle]').forEach((thumb, i) => thumb.toggleAttribute('data-pressed', i === index))
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inputs.forEach((input) => {
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// A value written by script fires no event: catch it on the input's own setters.
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for (const [property, descriptor] of [['value', VALUE], ['valueAsNumber', VALUE_AS_NUMBER]]) {
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Object.defineProperty(input, property, {
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configurable: true,
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get() {
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return descriptor.get.call(this)
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},
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set(value) {
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descriptor.set.call(this, value)
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schedule()
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},
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})
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}
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cleanups.push(() => {
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delete input.value
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delete input.valueAsNumber
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})
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listen(input, 'focus', () => showFocus(input, focusedByPointer !== input && input.matches(':focus-visible')))
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listen(input, 'blur', () => {
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focusedByPointer = null
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showFocus(input, false)
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})
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// slideOnKeyEvents: PageUp and PageDown move a tenth of the steps, one to ten of them.
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listen(input, 'keydown', (event) => {
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focusedByPointer = null
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showFocus(input, true)
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if (!['PageUp', 'PageDown'].includes(event.key) || input.disabled) {
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return
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}
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event.preventDefault()
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const { min, max, step } = bounds()
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const steps = step === null ? 100 : Math.max(Math.round((max - min) / step), 1)
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const delta = ((max - min) / steps) * clamp(Math.floor(steps / 10), 1, 10)
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if (commit(inputs.indexOf(input), Number.parseFloat(input.value) + (event.key === 'PageUp' ? delta : -delta))) {
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input.dispatchEvent(new Event('change', { bubbles: true }))
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}
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})
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})
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// Before x-model or wire:model reads it, hold a range input at its neighbour instead of passing it.
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listen(
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root,
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'input',
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(event) => {
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const index = inputs.indexOf(event.target)
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const [from, to] = values()
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if (range && index !== -1 && from > to) {
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VALUE.set.call(event.target, String(index === 0 ? to : from))
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}
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},
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true,
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)
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listen(root, 'input', schedule)
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const mutations = new MutationObserver(schedule)
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inputs.forEach((input) => mutations.observe(input, { attributes: true, attributeFilter: ['min', 'max', 'step', 'value', 'disabled'] }))
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mutations.observe(root, { attributes: true, attributeFilter: ['data-size', 'data-centered', 'dir'] })
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const resizes = new ResizeObserver(schedule)
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resizes.observe(root)
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cleanups.push(
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() => mutations.disconnect(),
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() => resizes.disconnect(),
|
|
)
|
|
|
|
draw()
|
|
|
|
return {
|
|
destroy() {
|
|
release?.()
|
|
cleanups.forEach((cleanup) => cleanup())
|
|
},
|
|
|
|
/** A press on the slider: sliderTapModifier, draggable and RangeSliderLogic.captureThumb. */
|
|
press(event) {
|
|
if ((event.pointerType === 'mouse' && event.button !== 0) || inputs.some((input) => input.disabled) || release) {
|
|
return
|
|
}
|
|
|
|
event.preventDefault()
|
|
|
|
const box = root.getBoundingClientRect()
|
|
const width = Math.max(box.width - HANDLE_WIDTH, 0)
|
|
const rtl = getComputedStyle(root).direction === 'rtl'
|
|
const { min, max } = bounds()
|
|
const handles = geometry(width).handles
|
|
|
|
const offset = (clientX) => clamp(rtl ? box.right - HANDLE_WIDTH / 2 - clientX : clientX - box.left - HANDLE_WIDTH / 2, 0, width)
|
|
const valueAt = (clientX) => min + (width > 0 ? offset(clientX) / width : 0) * (max - min)
|
|
|
|
const startX = event.clientX
|
|
const before = values()
|
|
let dragging = event.pointerType !== 'touch'
|
|
let index = null
|
|
|
|
// The nearest handle; handles on top of each other wait for the first move's direction.
|
|
const choose = (clientX) => {
|
|
if (!range) {
|
|
return 0
|
|
}
|
|
|
|
const x = offset(clientX)
|
|
const [start, end] = handles.map((handle) => Math.abs(handle - x))
|
|
|
|
if (start !== end) {
|
|
return start < end ? 0 : 1
|
|
}
|
|
|
|
const moved = rtl ? startX - clientX : clientX - startX
|
|
|
|
return moved === 0 ? null : moved < 0 ? 0 : 1
|
|
}
|
|
|
|
const follow = (clientX) => {
|
|
index ??= choose(clientX)
|
|
|
|
if (index === null) {
|
|
return
|
|
}
|
|
|
|
if (document.activeElement !== inputs[index]) {
|
|
focusedByPointer = inputs[index]
|
|
inputs[index].focus({ preventScroll: true })
|
|
}
|
|
|
|
pressed(index)
|
|
commit(index, valueAt(clientX))
|
|
}
|
|
|
|
const move = (moveEvent) => {
|
|
if (moveEvent.pointerId !== event.pointerId) {
|
|
return
|
|
}
|
|
|
|
if (!dragging && Math.abs(moveEvent.clientX - startX) < TOUCH_SLOP) {
|
|
return
|
|
}
|
|
|
|
dragging = true
|
|
follow(moveEvent.clientX)
|
|
}
|
|
|
|
const end = (endEvent) => {
|
|
if (endEvent.pointerId !== event.pointerId) {
|
|
return
|
|
}
|
|
|
|
if (endEvent.type === 'pointerup' && !dragging) {
|
|
follow(endEvent.clientX)
|
|
}
|
|
|
|
release()
|
|
|
|
values().forEach((value, i) => {
|
|
if (value !== before[i]) {
|
|
inputs[i].dispatchEvent(new Event('change', { bubbles: true }))
|
|
}
|
|
})
|
|
}
|
|
|
|
release = () => {
|
|
window.removeEventListener('pointermove', move)
|
|
window.removeEventListener('pointerup', end)
|
|
window.removeEventListener('pointercancel', end)
|
|
pressed(null)
|
|
release = null
|
|
}
|
|
|
|
window.addEventListener('pointermove', move)
|
|
window.addEventListener('pointerup', end)
|
|
window.addEventListener('pointercancel', end)
|
|
|
|
if (dragging) {
|
|
follow(event.clientX)
|
|
}
|
|
},
|
|
}
|
|
}
|
|
|
|
document.addEventListener('alpine:init', () => {
|
|
window.Alpine.data('materialSlider', () => {
|
|
let behaviour = null
|
|
|
|
return {
|
|
init() {
|
|
behaviour = slider(this.$el)
|
|
},
|
|
|
|
destroy() {
|
|
behaviour?.destroy()
|
|
},
|
|
|
|
press(event) {
|
|
behaviour?.press(event)
|
|
},
|
|
}
|
|
})
|
|
})
|