Handle draggable lines on touch screens
This commit is contained in:
axolotle
committed by
John Livingston
John Livingston
parent
048c003ff0
commit
d79deef5c0
@ -1,4 +1,5 @@
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// SPDX-FileCopyrightText: 2024 John Livingston <https://www.john-livingston.fr/>
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// SPDX-FileCopyrightText: 2025 Nicolas Chesnais <https://autre.space>
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//
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// SPDX-License-Identifier: AGPL-3.0-only
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@ -11,6 +12,7 @@ import './styles/draggables.scss'
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*/
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export class DraggablesCustomElement extends CustomElement {
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currentDragged = null
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droppableEl = null
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/**
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* The tag name for draggable elements.
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@ -37,6 +39,9 @@ export class DraggablesCustomElement extends CustomElement {
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this._handleDragLeaveBinded = this._handleDragLeave.bind(this)
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this._handleDragEndBinded = this._handleDragEnd.bind(this)
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this._handleDropBinded = this._handleDrop.bind(this)
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this._handleTouchStartBinded = this._handleTouchStart.bind(this)
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this._handleTouchMoveBinded = this._handleTouchMove.bind(this)
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this._handleTouchEndBinded = this._handleTouchEnd.bind(this)
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return super.initialize()
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}
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@ -44,21 +49,29 @@ export class DraggablesCustomElement extends CustomElement {
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connectedCallback () {
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super.connectedCallback()
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this.currentDragged = null
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this.droppableEl = null
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this.addEventListener('dragstart', this._handleDragStartBinded)
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this.addEventListener('dragover', this._handleDragOverBinded)
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this.addEventListener('dragleave', this._handleDragLeaveBinded)
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this.addEventListener('dragend', this._handleDragEndBinded)
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this.addEventListener('drop', this._handleDropBinded)
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this.addEventListener('touchstart', this._handleTouchStartBinded)
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this.addEventListener('touchmove', this._handleTouchMoveBinded)
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this.addEventListener('touchend', this._handleTouchEndBinded)
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}
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disconnectedCallback () {
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super.disconnectedCallback()
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this.currentDragged = null
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this.droppableEl = null
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this.removeEventListener('dragstart', this._handleDragStartBinded)
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this.removeEventListener('dragover', this._handleDragOverBinded)
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this.removeEventListener('dragleave', this._handleDragLeaveBinded)
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this.removeEventListener('dragend', this._handleDragEndBinded)
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this.removeEventListener('drop', this._handleDropBinded)
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this.removeEventListener('touchstart', this._handleTouchStartBinded)
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this.removeEventListener('touchmove', this._handleTouchMoveBinded)
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this.removeEventListener('touchend', this._handleTouchEndBinded)
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}
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_isADraggableEl (target) {
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@ -69,8 +82,7 @@ export class DraggablesCustomElement extends CustomElement {
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return target.closest?.(this.droppableTagNames.join(','))
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}
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_isOnTopHalf (ev, el) {
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const y = ev.clientY
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_isOnTopHalf (y, el) {
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const bounding = el.getBoundingClientRect()
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return (y <= bounding.y + (bounding.height / 2))
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}
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@ -81,13 +93,39 @@ export class DraggablesCustomElement extends CustomElement {
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)
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}
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_setCurrentDragged (draggedEl) {
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console.log('[livechat drag&drop] Starting to drag a ' + this.draggableTagName + '...')
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this.currentDragged = draggedEl
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this._resetDropOver()
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}
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_setDroppableClasses (droppableEl, y) {
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// Are we on the top or bottom part of the droppableEl?
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let topHalf = false
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if (!this.droppableAlwaysBottomTagNames.includes(droppableEl.nodeName.toLowerCase())) {
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topHalf = this._isOnTopHalf(y, droppableEl)
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}
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droppableEl.classList.add(topHalf ? 'livechat-drag-top-half' : 'livechat-drag-bottom-half')
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droppableEl.classList.remove(topHalf ? 'livechat-drag-bottom-half' : 'livechat-drag-top-half')
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}
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_tryToDrop (droppedOnEl) {
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if (!droppedOnEl) return
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console.log('[livechat drag&drop] ' + this.draggableTagName + ' dropped...')
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try {
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this._dropDone(this.currentDragged, droppedOnEl, droppedOnEl.classList.contains('livechat-drag-top-half'))
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} catch (err) {
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console.error(err)
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}
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this._resetDropOver()
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}
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_handleDragStart (ev) {
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// The draggable=true is on a child bode
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const possibleEl = ev.target.parentElement
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if (!this._isADraggableEl(possibleEl)) { return }
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console.log('[livechat drag&drop] Starting to drag a ' + this.draggableTagName + '...')
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this.currentDragged = possibleEl
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this._resetDropOver()
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this._setCurrentDragged(possibleEl)
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}
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_handleDragOver (ev) {
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@ -97,14 +135,7 @@ export class DraggablesCustomElement extends CustomElement {
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// https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/drop_event says we should preventDefault
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ev.preventDefault()
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// Are we on the top or bottom part of the droppableEl?
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let topHalf = false
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if (!this.droppableAlwaysBottomTagNames.includes(droppableEl.nodeName.toLowerCase())) {
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topHalf = this._isOnTopHalf(ev, droppableEl)
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}
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droppableEl.classList.add(topHalf ? 'livechat-drag-top-half' : 'livechat-drag-bottom-half')
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droppableEl.classList.remove(topHalf ? 'livechat-drag-bottom-half' : 'livechat-drag-top-half')
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this._setDroppableClasses(droppableEl, ev.clientY)
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}
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_handleDragLeave (ev) {
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@ -124,16 +155,33 @@ export class DraggablesCustomElement extends CustomElement {
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let droppedOnEl = document.querySelector('.livechat-drag-bottom-half, .livechat-drag-top-half')
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droppedOnEl = this._getParentDroppableEl(droppedOnEl)
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if (!droppedOnEl) { return }
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this._tryToDrop(droppedOnEl)
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}
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console.log('[livechat drag&drop] ' + this.draggableTagName + ' dropped...')
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_handleTouchStart (ev) {
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const possibleEl = this._getParentDroppableEl(ev.target)
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if (!possibleEl) return
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this._setCurrentDragged(possibleEl)
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}
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try {
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this._dropDone(this.currentDragged, droppedOnEl, droppedOnEl.classList.contains('livechat-drag-top-half'))
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} catch (err) {
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console.error(err)
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}
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_handleTouchMove (ev) {
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if (!this.currentDragged) return
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const { clientX, clientY } = ev.touches[0]
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const droppableEl = this._getParentDroppableEl(document.elementFromPoint(clientX, clientY))
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if (!droppableEl || droppableEl === this.droppableEl) return
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this.droppableEl = droppableEl
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this._resetDropOver()
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this._setDroppableClasses(droppableEl, clientY)
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}
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_handleTouchEnd (_ev) {
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if (!this.currentDragged || !this.droppableEl) return
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this._tryToDrop(this.droppableEl)
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this.currentDragged = null
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this.droppableEl = null
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}
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/**
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@ -1,5 +1,6 @@
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/*
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* SPDX-FileCopyrightText: 2024 John Livingston <https://www.john-livingston.fr/>
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* SPDX-FileCopyrightText: 2025 Nicolas Chesnais <https://autre.space>
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*
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* SPDX-License-Identifier: AGPL-3.0-only
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*/
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@ -16,4 +17,8 @@
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.livechat-drag-top-half > .draggables-line {
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border-top: 4px solid blue;
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}
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[draggable="true"] {
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touch-action: none;
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}
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}
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