1 line
39 KiB
Plaintext
1 line
39 KiB
Plaintext
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* dd-draggable.ts 12.6.0\n * Copyright (c) 2021-2025 Alain Dumesny - see GridStack root license\n */\n\nimport { DDManager } from './dd-manager';\nimport { DragTransform, Utils } from './utils';\nimport { DDBaseImplement, HTMLElementExtendOpt } from './dd-base-impl';\nimport { GridItemHTMLElement, DDUIData, GridStackNode, GridStackPosition, DDDragOpt } from './types';\nimport { DDElementHost } from './dd-element';\nimport { isTouch, touchend, touchmove, touchstart, pointerdown, DDTouch } from './dd-touch';\nimport { GridHTMLElement } from './gridstack';\n\ninterface DragOffset {\n x: number;\n top: number;\n width: number;\n height: number;\n offsetX: number;\n offsetTop: number;\n}\n\ninterface GridStackNodeRotate extends GridStackNode {\n _origRotate?: GridStackPosition;\n}\n\ntype DDDragEvent = 'drag' | 'dragstart' | 'dragstop';\n\n// make sure we are not clicking on known object that handles mouseDown\nconst skipMouseDown = 'input,textarea,button,select,option,[contenteditable=\"true\"],.ui-resizable-handle';\n\n// let count = 0; // TEST\n\nexport class DDDraggable extends DDBaseImplement implements HTMLElementExtendOpt<DDDragOpt> {\n public helper: HTMLElement; // used by GridStackDDNative\n\n /** @internal */\n protected mouseDownEvent: MouseEvent;\n /** @internal */\n protected dragOffset: DragOffset;\n /** @internal */\n protected dragElementOriginStyle: Array<string>;\n /** @internal */\n protected dragEls: HTMLElement[];\n /** @internal true while we are dragging an item around */\n public dragging: boolean;\n /** @internal last drag event */\n public lastDrag: DragEvent;\n /** @internal */\n protected parentOriginStylePosition: string;\n /** @internal */\n protected helperContainment: HTMLElement;\n /** @internal properties we change during dragging, and restore back */\n protected static originStyleProp = ['width', 'height', 'transform', 'transform-origin', 'transition', 'pointerEvents', 'position', 'left', 'right', 'top', 'minWidth', 'willChange'];\n /** @internal pause before we call the actual drag hit collision code */\n protected dragTimeout: number;\n /** @internal */\n protected dragTransform: DragTransform = {\n xScale: 1,\n yScale: 1,\n xOffset: 0,\n yOffset: 0\n };\n /** @internal auto-scroll animation variables */\n protected _autoScrollAnimId?: number;\n protected _autoScrollContainer?: HTMLElement;\n protected _autoScrollMaxSpeed?: number;\n\n constructor(public el: GridItemHTMLElement, public option: DDDragOpt = {}) {\n super();\n\n // get the element that is actually supposed to be dragged by\n const handleName = option?.handle?.substring(1);\n const n = el.gridstackNode;\n this.dragEls = !handleName || el.classList.contains(handleName) ? 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[el.querySelector(option.handle) || el] : this.getAllHandles());\n if (this.dragEls.length === 0) {\n this.dragEls = [el];\n }\n // create var event binding so we can easily remove and still look like TS methods (unlike anonymous functions)\n this._mouseDown = this._mouseDown.bind(this);\n this._mouseMove = this._mouseMove.bind(this);\n this._mouseUp = this._mouseUp.bind(this);\n this._keyEvent = this._keyEvent.bind(this);\n this.enable();\n }\n\n /** return all handles omitting other nested `.grid-stack-item` children (in case node.subGrid isn't set for some reason) */\n protected getAllHandles(): HTMLElement[] {\n return Array.from(this.el.querySelectorAll(this.option.handle)).filter((node): node is HTMLElement => {\n if (!(node instanceof HTMLElement)) return false;\n const owner = node.closest('.grid-stack-item');\n return owner === this.el || !owner;\n });\n }\n\n public on(event: DDDragEvent, callback: (event: DragEvent) => void): void {\n super.on(event, callback);\n }\n\n public off(event: DDDragEvent): void {\n super.off(event);\n }\n\n public enable(): void {\n if (this.disabled === false) return;\n super.enable();\n this.dragEls.forEach(dragEl => {\n dragEl.addEventListener('mousedown', this._mouseDown);\n if (isTouch) {\n dragEl.addEventListener('touchstart', touchstart);\n dragEl.addEventListener('pointerdown', pointerdown);\n // dragEl.style.touchAction = 'none'; // not needed unlike pointerdown doc comment\n }\n });\n this.el.classList.remove('ui-draggable-disabled');\n }\n\n public disable(forDestroy = false): void {\n if (this.disabled === true) return;\n super.disable();\n this.dragEls.forEach(dragEl => {\n dragEl.removeEventListener('mousedown', this._mouseDown);\n if (isTouch) {\n dragEl.removeEventListener('touchstart', touchstart);\n dragEl.removeEventListener('pointerdown', pointerdown);\n }\n });\n if (!forDestroy) this.el.classList.add('ui-draggable-disabled');\n }\n\n public destroy(): void {\n if (this.dragTimeout) window.clearTimeout(this.dragTimeout);\n delete this.dragTimeout;\n if (this.mouseDownEvent) this._mouseUp(this.mouseDownEvent);\n this.disable(true);\n delete this.el;\n delete this.helper;\n delete this.option;\n super.destroy();\n }\n\n public updateOption(opts: DDDragOpt): DDDraggable {\n Object.keys(opts).forEach(key => this.option[key] = opts[key]);\n return this;\n }\n\n /** @internal call when mouse goes down before a dragstart happens */\n protected _mouseDown(e: MouseEvent): boolean {\n // if real brower event (trusted:true vs false for our simulated ones) and we didn't correctly clear the last touch event, clear things up\n if (DDTouch.touchHandled && e.isTrusted) DDTouch.touchHandled = false;\n\n // don't let more than one widget handle mouseStart\n if (DDManager.mouseHandled) return;\n if (e.button !== 0) return true; // only left click\n\n // make sure we are not clicking on known object that handles mouseDown, or ones supplied by the user\n if (!this.dragEls.find(el => el === e.target) && (e.target as HTMLElement).closest(skipMouseDown)) return true;\n if (this.option.cancel) {\n if ((e.target as HTMLElement).closest(this.option.cancel)) return true;\n }\n\n this.mouseDownEvent = e;\n delete this.dragging;\n delete DDManager.dragElement;\n delete DDManager.dropElement;\n delete this._autoScrollMaxSpeed;\n delete this._autoScrollContainer;\n // document handler so we can continue receiving moves as the item is 'fixed' position, and capture=true so WE get a first crack\n document.addEventListener('mousemove', this._mouseMove, { capture: true, passive: true }); // true=capture, not bubble\n document.addEventListener('mouseup', this._mouseUp, true);\n if (isTouch) {\n e.currentTarget.addEventListener('touchmove', touchmove);\n e.currentTarget.addEventListener('touchend', touchend);\n }\n\n e.preventDefault();\n // preventDefault() prevents blur event which occurs just after mousedown event.\n // if an editable content has focus, then blur must be call\n if (document.activeElement) (document.activeElement as HTMLElement).blur();\n\n DDManager.mouseHandled = true;\n return true;\n }\n\n /** @internal method to call actual drag event */\n public _callDrag(e: DragEvent): void {\n if (!this.dragging) return;\n const ev = Utils.initEvent<DragEvent>(e, { target: this.el, type: 'drag' });\n if (this.option.drag) {\n this.option.drag(ev, this.ui());\n }\n this.triggerEvent('drag', ev);\n }\n\n /** @internal called when the main page (after successful mousedown) receives a move event to drag the item around the screen */\n protected _mouseMove(e: DragEvent): boolean {\n // console.log(`${count++} move ${e.x},${e.y}`)\n const s = this.mouseDownEvent;\n this.lastDrag = e;\n\n if (this.dragging) {\n this._dragFollow(e);\n // delay actual grid handling drag until we pause for a while if set\n if (DDManager.pauseDrag) {\n const pause = Number.isInteger(DDManager.pauseDrag) ? DDManager.pauseDrag as number : 100;\n if (this.dragTimeout) window.clearTimeout(this.dragTimeout);\n this.dragTimeout = window.setTimeout(() => this._callDrag(e), pause);\n } else {\n this._callDrag(e);\n }\n } else if (Math.abs(e.x - s.x) + Math.abs(e.y - s.y) > 3) {\n /**\n * don't start unless we've moved at least 3 pixels\n */\n this.dragging = true;\n DDManager.dragElement = this;\n // if we're dragging an actual grid item, set the current drop as the grid (to detect enter/leave)\n const grid = this.el.gridstackNode?.grid;\n if (grid) {\n DDManager.dropElement = (grid.el as DDElementHost).ddElement.ddDroppable;\n } else {\n delete DDManager.dropElement;\n }\n this.helper = this._createHelper();\n this._setupHelperContainmentStyle();\n this.dragTransform = Utils.getValuesFromTransformedElement(this.helperContainment);\n this.dragOffset = this._getDragOffset(e, this.el, this.helperContainment);\n this._setupHelperStyle(e);\n\n const ev = Utils.initEvent<DragEvent>(e, { target: this.el, type: 'dragstart' });\n if (this.option.start) {\n this.option.start(ev, this.ui());\n }\n this.triggerEvent('dragstart', ev);\n // now track keyboard events to cancel or rotate\n document.addEventListener('keydown', this._keyEvent);\n }\n // e.preventDefault(); // passive = true. OLD: was needed otherwise we get text sweep text selection as we drag around\n return true;\n }\n\n /** @internal call when the mouse gets released to drop the item at current location */\n protected _mouseUp(e: MouseEvent): void {\n this._stopScrolling();\n document.removeEventListener('mousemove', this._mouseMove, true);\n document.removeEventListener('mouseup', this._mouseUp, true);\n if (isTouch && e.currentTarget) { // destroy() during nested grid call us again wit fake _mouseUp\n e.currentTarget.removeEventListener('touchmove', touchmove, true);\n e.currentTarget.removeEventListener('touchend', touchend, true);\n }\n if (this.dragging) {\n delete this.dragging;\n delete (this.el.gridstackNode as GridStackNodeRotate)?._origRotate;\n document.removeEventListener('keydown', this._keyEvent);\n\n // reset the drop target if dragging over ourself (already parented, just moving during stop callback below)\n if (DDManager.dropElement?.el === this.el.parentElement) {\n delete DDManager.dropElement;\n }\n\n this.helperContainment.style.position = this.parentOriginStylePosition || null;\n if (this.helper !== this.el) this.helper.remove(); // hide now\n this._removeHelperStyle();\n\n const ev = Utils.initEvent<DragEvent>(e, { target: this.el, type: 'dragstop' });\n if (this.option.stop) {\n this.option.stop(ev); // NOTE: destroy() will be called when removing item, so expect NULL ptr after!\n }\n this.triggerEvent('dragstop', ev);\n\n // call the droppable method to receive the item\n if (DDManager.dropElement) {\n DDManager.dropElement.drop(e);\n }\n }\n delete this.helper;\n delete this.mouseDownEvent;\n delete DDManager.dragElement;\n delete DDManager.dropElement;\n delete DDManager.mouseHandled;\n e.preventDefault();\n }\n\n /** @internal call when keys are being pressed - use Esc to cancel, R to rotate */\n protected _keyEvent(e: KeyboardEvent): void {\n const n = this.el.gridstackNode as GridStackNodeRotate;\n const grid = n?.grid || (DDManager.dropElement?.el as GridHTMLElement)?.gridstack;\n\n if (e.key === 'Escape') {\n if (n && n._origRotate) {\n n._orig = n._origRotate;\n delete n._origRotate;\n }\n grid?.cancelDrag();\n this._mouseUp(this.mouseDownEvent);\n } else if (n && grid && (e.key === 'r' || e.key === 'R')) {\n if (!Utils.canBeRotated(n)) return;\n n._origRotate = n._origRotate || { ...n._orig }; // store the real orig size in case we Esc after doing rotation\n delete n._moving; // force rotate to happen (move waits for >50% coverage otherwise)\n grid.setAnimation(false) // immediate rotate so _getDragOffset() gets the right dom size below\n .rotate(n.el, {\n top: -this.dragOffset.offsetTop,\n left: -this.dragOffset.offsetX\n })\n .setAnimation();\n n._moving = true;\n this.dragOffset = this._getDragOffset(this.lastDrag, n.el, this.helperContainment);\n this.helper.style.width = this.dragOffset.width + 'px';\n this.helper.style.height = this.dragOffset.height + 'px';\n Utils.swap(n._orig, 'w', 'h');\n delete n._rect;\n this._mouseMove(this.lastDrag);\n }\n }\n\n /** @internal create a clone copy (or user defined method) of the original drag item if set */\n protected _createHelper(): HTMLElement {\n let helper = this.el;\n if (typeof this.option.helper === 'function') {\n helper = this.option.helper(this.el);\n } else if (this.option.helper === 'clone') {\n helper = Utils.cloneNode(this.el);\n }\n if (!helper.parentElement) {\n Utils.appendTo(helper, this.option.appendTo === 'parent' ? this.el.parentElement : this.option.appendTo);\n }\n this.dragElementOriginStyle = DDDraggable.originStyleProp.map(prop => this.el.style[prop]);\n return helper;\n }\n\n /** @internal set the fix position of the dragged item */\n protected _setupHelperStyle(e: DragEvent): DDDraggable {\n this.helper.classList.add('ui-draggable-dragging');\n this.el.gridstackNode?.grid?.el.classList.add('grid-stack-dragging');\n // TODO: set all at once with style.cssText += ... ? https://stackoverflow.com/questions/3968593\n const style = this.helper.style;\n style.pointerEvents = 'none'; // needed for over items to get enter/leave\n // style.cursor = 'move'; // TODO: can't set with pointerEvents=none ! (no longer in CSS either as no-op)\n style.width = this.dragOffset.width + 'px';\n style.height = this.dragOffset.height + 'px';\n style.willChange = 'left, right, top';\n style.position = 'fixed'; // let us drag between grids by not clipping as parent .grid-stack is position: 'relative'\n this._dragFollow(e); // now position it\n style.transition = 'none'; // show up instantly\n setTimeout(() => {\n if (this.helper) {\n style.transition = null; // recover animation\n }\n }, 0);\n return this;\n }\n\n /** @internal restore back the original style before dragging */\n protected _removeHelperStyle(): DDDraggable {\n this.helper.classList.remove('ui-draggable-dragging');\n this.el.gridstackNode?.grid?.el.classList.remove('grid-stack-dragging');\n const node = (this.helper as GridItemHTMLElement)?.gridstackNode;\n // don't bother restoring styles if we're gonna remove anyway...\n if (!node?._isAboutToRemove && this.dragElementOriginStyle) {\n const helper = this.helper;\n // don't animate, otherwise we animate offseted when switching back to 'absolute' from 'fixed'.\n // TODO: this also removes resizing animation which doesn't have this issue, but others.\n // Ideally both would animate ('move' would immediately restore 'absolute' and adjust coordinate to match,\n // then trigger a delay (repaint) to restore to final dest with animate) but then we need to make sure 'resizestop'\n // is called AFTER 'transitionend' event is received (see https://github.com/gridstack/gridstack.js/issues/2033)\n const transition = this.dragElementOriginStyle['transition'] || null;\n helper.style.transition = this.dragElementOriginStyle['transition'] = 'none'; // can't be NULL #1973\n DDDraggable.originStyleProp.forEach(prop => helper.style[prop] = this.dragElementOriginStyle[prop] || null);\n setTimeout(() => helper.style.transition = transition, 50); // recover animation from saved vars after a pause (0 isn't enough #1973)\n }\n delete this.dragElementOriginStyle;\n return this;\n }\n\n /** @internal updates the top/left position to follow the mouse */\n public _dragFollow(e: DragEvent): void {\n const style = this.helper.style;\n const offset = this.dragOffset;\n if (this.option.rtl) {\n style.right = ((window.innerWidth - e.clientX) + offset.offsetX) * this.dragTransform.xScale + 'px';\n if (style.left)\n style.left = '';\n } else {\n style.left = (e.clientX + offset.offsetX) * this.dragTransform.xScale + 'px';\n if (style.right)\n style.right = '';\n }\n style.top = (e.clientY + offset.offsetTop) * this.dragTransform.yScale + 'px';\n }\n\n /** @internal */\n protected _setupHelperContainmentStyle(): DDDraggable {\n this.helperContainment = this.helper.parentElement;\n if (this.helper.style.position !== 'fixed') {\n this.parentOriginStylePosition = this.helperContainment.style.position;\n if (getComputedStyle(this.helperContainment).position.match(/static/)) {\n this.helperContainment.style.position = 'relative';\n }\n }\n return this;\n }\n\n /** @internal */\n protected _getDragOffset(event: DragEvent, el: HTMLElement, parent: HTMLElement): DragOffset {\n\n // in case ancestor has transform/perspective css properties that change the viewpoint\n let xformOffsetX = 0;\n let xformOffsetY = 0;\n if (parent) {\n xformOffsetX = this.dragTransform.xOffset;\n xformOffsetY = this.dragTransform.yOffset;\n }\n\n const targetOffset = el.getBoundingClientRect();\n let x = this.option.rtl ? targetOffset.right : targetOffset.left;\n let offsetX = this.option.rtl\n ? (event.clientX - targetOffset.right + xformOffsetX)\n : (-event.clientX + targetOffset.left - xformOffsetX);\n\n return {\n x,\n top: targetOffset.top,\n offsetX,\n offsetTop: - event.clientY + targetOffset.top - xformOffsetY,\n width: targetOffset.width * this.dragTransform.xScale,\n height: targetOffset.height * this.dragTransform.yScale\n };\n }\n\n /** @internal starts or continues auto-scroll when the dragged helper is clipped by the scroll container.\n * Takes the grid's own element to find the scroll container so external/sidebar drags work too (#2074). */\n public updateScrollPosition(gridEl: HTMLElement): void {\n this._autoScrollContainer = Utils.getScrollElement(gridEl); // always use latest active grid\n const clipping = this._getClipping(this.helper, this._autoScrollContainer);\n if (clipping === 0) {\n this._stopScrolling();\n } else if (!this._autoScrollAnimId) {\n this._autoScrollAnimId = requestAnimationFrame(this._autoScrollTick);\n }\n }\n\n /** @internal compute how many pixels the element is clipped: negative = above, positive = below, 0 = fully inside OR outside (stop scrolling) */\n protected _getClipping(el: HTMLElement, scrollEl: HTMLElement): number {\n const elRect = el.getBoundingClientRect();\n const scrollRect = scrollEl.getBoundingClientRect();\n const viewportH = window.innerHeight || document.documentElement.clientHeight;\n if (elRect.bottom < scrollRect.top || elRect.top > scrollRect.bottom) return 0; // fully outside\n const clippedBelow = elRect.bottom - Math.min(scrollRect.bottom, viewportH);\n const clippedAbove = elRect.top - Math.max(scrollRect.top, 0);\n if (clippedAbove < 0) return clippedAbove;\n if (clippedBelow > 0) return clippedBelow;\n return 0;\n }\n\n /** @internal single tick of the auto-scroll animation loop */\n protected _autoScrollTick = (): void => {\n const el = this.helper;\n const scrollCont = this._autoScrollContainer;\n if (!el || !scrollCont) { this._stopScrolling(); return; }\n const clipping = this._getClipping(el, scrollCont);\n if (clipping === 0) { this._stopScrolling(); return; }\n\n if (!this._autoScrollMaxSpeed) {\n const viewportH = window.innerHeight || document.documentElement.clientHeight;\n this._autoScrollMaxSpeed = Math.max(viewportH / 150, 4);\n }\n const absPx = Math.abs(clipping);\n const speed = Math.min(absPx * 0.5, this._autoScrollMaxSpeed);\n const scrollAmount = clipping > 0 ? speed : -speed;\n\n const prevScroll = scrollCont.scrollTop;\n scrollCont.scrollTop += scrollAmount;\n if (scrollCont.scrollTop === prevScroll) { this._stopScrolling(); return; }\n\n if (this.dragging && this.lastDrag) {\n this._dragFollow(this.lastDrag);\n this._callDrag(this.lastDrag);\n }\n\n this._autoScrollAnimId = requestAnimationFrame(this._autoScrollTick);\n }\n\n /** @internal stop any active auto-scroll animation */\n public _stopScrolling(): void {\n if (this._autoScrollAnimId) {\n cancelAnimationFrame(this._autoScrollAnimId);\n delete this._autoScrollAnimId;\n }\n }\n\n /** @internal TODO: set to public as called by DDDroppable! */\n public ui(): DDUIData {\n const containmentEl = this.el.parentElement;\n const containmentRect = containmentEl.getBoundingClientRect();\n const offset = this.helper.getBoundingClientRect();\n\n // RTL: GridStack measures column positions from the right side of the container,\n // so we report `left` as the distance between the helper's right edge and the\n // container's right edge (both in viewport-left coordinates via getBoundingClientRect).\n const leftPos = this.option.rtl\n ? (containmentRect.right - offset.right) * this.dragTransform.xScale\n : (offset.left - containmentRect.left) * this.dragTransform.xScale;\n\n return {\n position: { //Current CSS position of the helper as { top, left } object\n top: (offset.top - containmentRect.top) * this.dragTransform.yScale,\n left: leftPos\n }\n /* not used by GridStack for now...\n helper: [this.helper], //The object arr representing the helper that's being dragged.\n offset: { top: offset.top, left: offset.left } // Current offset position of the helper as { top, left } object.\n */\n };\n }\n}\n"]} |