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import {
on,
off,
css,
throttle,
cancelThrottle,
scrollBy,
getParentAutoScrollElement,
expando,
getRect,
getWindowScrollingElement
} from '../../src/utils.js';
import Sortable from '../../src/Sortable.js';
import { Edge, IE11OrLess, Safari } from '../../src/BrowserInfo.js';
let autoScrolls = [],
scrollEl,
scrollRootEl,
scrolling = false,
lastAutoScrollX,
lastAutoScrollY,
touchEvt,
pointerElemChangedInterval;
function AutoScrollPlugin() {
function AutoScroll() {
this.defaults = {
scroll: true,
forceAutoScrollFallback: false,
scrollSensitivity: 30,
scrollSpeed: 10,
bubbleScroll: true
};
// Bind all private methods
for (let fn in this) {
if (fn.charAt(0) === '_' && typeof this[fn] === 'function') {
this[fn] = this[fn].bind(this);
}
}
}
AutoScroll.prototype = {
dragStarted({ originalEvent }) {
if (this.sortable.nativeDraggable) {
on(document, 'dragover', this._handleAutoScroll);
} else {
if (this.options.supportPointer) {
on(document, 'pointermove', this._handleFallbackAutoScroll);
} else if (originalEvent.touches) {
on(document, 'touchmove', this._handleFallbackAutoScroll);
} else {
on(document, 'mousemove', this._handleFallbackAutoScroll);
}
}
},
dragOverCompleted({ originalEvent }) {
// For when bubbling is canceled and using fallback (fallback 'touchmove' always reached)
if (!this.options.dragOverBubble && !originalEvent.rootEl) {
this._handleAutoScroll(originalEvent);
}
},
drop() {
if (this.sortable.nativeDraggable) {
off(document, 'dragover', this._handleAutoScroll);
} else {
off(document, 'pointermove', this._handleFallbackAutoScroll);
off(document, 'touchmove', this._handleFallbackAutoScroll);
off(document, 'mousemove', this._handleFallbackAutoScroll);
}
clearPointerElemChangedInterval();
clearAutoScrolls();
cancelThrottle();
},
nulling() {
touchEvt =
scrollRootEl =
scrollEl =
scrolling =
pointerElemChangedInterval =
lastAutoScrollX =
lastAutoScrollY = null;
autoScrolls.length = 0;
},
_handleFallbackAutoScroll(evt) {
this._handleAutoScroll(evt, true);
},
_handleAutoScroll(evt, fallback) {
const x = (evt.touches ? evt.touches[0] : evt).clientX,
y = (evt.touches ? evt.touches[0] : evt).clientY,
elem = document.elementFromPoint(x, y);
touchEvt = evt;
// IE does not seem to have native autoscroll,
// Edge's autoscroll seems too conditional,
// MACOS Safari does not have autoscroll,
// Firefox and Chrome are good
if (fallback || this.options.forceAutoScrollFallback || Edge || IE11OrLess || Safari) {
autoScroll(evt, this.options, elem, fallback);
// Listener for pointer element change
let ogElemScroller = getParentAutoScrollElement(elem, true);
if (
scrolling &&
(
!pointerElemChangedInterval ||
x !== lastAutoScrollX ||
y !== lastAutoScrollY
)
) {
pointerElemChangedInterval && clearPointerElemChangedInterval();
// Detect for pointer elem change, emulating native DnD behaviour
pointerElemChangedInterval = setInterval(() => {
let newElem = getParentAutoScrollElement(document.elementFromPoint(x, y), true);
if (newElem !== ogElemScroller) {
ogElemScroller = newElem;
clearAutoScrolls();
}
autoScroll(evt, this.options, newElem, fallback);
}, 10);
lastAutoScrollX = x;
lastAutoScrollY = y;
}
} else {
// if DnD is enabled (and browser has good autoscrolling), first autoscroll will already scroll, so get parent autoscroll of first autoscroll
if (!this.options.bubbleScroll || getParentAutoScrollElement(elem, true) === getWindowScrollingElement()) {
clearAutoScrolls();
return;
}
autoScroll(evt, this.options, getParentAutoScrollElement(elem, false), false);
}
}
};
return Object.assign(AutoScroll, {
pluginName: 'scroll',
initializeByDefault: true
});
}
function clearAutoScrolls() {
autoScrolls.forEach(function(autoScroll) {
clearInterval(autoScroll.pid);
});
autoScrolls = [];
}
function clearPointerElemChangedInterval() {
clearInterval(pointerElemChangedInterval);
}
const autoScroll = throttle(function(evt, options, rootEl, isFallback) {
// Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=505521
if (!options.scroll) return;
const x = (evt.touches ? evt.touches[0] : evt).clientX,
y = (evt.touches ? evt.touches[0] : evt).clientY,
sens = options.scrollSensitivity,
speed = options.scrollSpeed,
winScroller = getWindowScrollingElement();
let scrollThisInstance = false,
scrollCustomFn;
// New scroll root, set scrollEl
if (scrollRootEl !== rootEl) {
scrollRootEl = rootEl;
clearAutoScrolls();
scrollEl = options.scroll;
scrollCustomFn = options.scrollFn;
if (scrollEl === true) {
scrollEl = getParentAutoScrollElement(rootEl, true);
}
}
let layersOut = 0;
let currentParent = scrollEl;
do {
let el = currentParent,
rect = getRect(el),
top = rect.top,
bottom = rect.bottom,
left = rect.left,
right = rect.right,
width = rect.width,
height = rect.height,
canScrollX,
canScrollY,
scrollWidth = el.scrollWidth,
scrollHeight = el.scrollHeight,
elCSS = css(el),
scrollPosX = el.scrollLeft,
scrollPosY = el.scrollTop;
if (el === winScroller) {
canScrollX = width < scrollWidth && (elCSS.overflowX === 'auto' || elCSS.overflowX === 'scroll' || elCSS.overflowX === 'visible');
canScrollY = height < scrollHeight && (elCSS.overflowY === 'auto' || elCSS.overflowY === 'scroll' || elCSS.overflowY === 'visible');
} else {
canScrollX = width < scrollWidth && (elCSS.overflowX === 'auto' || elCSS.overflowX === 'scroll');
canScrollY = height < scrollHeight && (elCSS.overflowY === 'auto' || elCSS.overflowY === 'scroll');
}
let vx = canScrollX && (Math.abs(right - x) <= sens && (scrollPosX + width) < scrollWidth) - (Math.abs(left - x) <= sens && !!scrollPosX);
let vy = canScrollY && (Math.abs(bottom - y) <= sens && (scrollPosY + height) < scrollHeight) - (Math.abs(top - y) <= sens && !!scrollPosY);
if (!autoScrolls[layersOut]) {
for (let i = 0; i <= layersOut; i++) {
if (!autoScrolls[i]) {
autoScrolls[i] = {};
}
}
}
if (autoScrolls[layersOut].vx != vx || autoScrolls[layersOut].vy != vy || autoScrolls[layersOut].el !== el) {
autoScrolls[layersOut].el = el;
autoScrolls[layersOut].vx = vx;
autoScrolls[layersOut].vy = vy;
clearInterval(autoScrolls[layersOut].pid);
if (vx != 0 || vy != 0) {
scrollThisInstance = true;
/* jshint loopfunc:true */
autoScrolls[layersOut].pid = setInterval((function () {
// emulate drag over during autoscroll (fallback), emulating native DnD behaviour
if (isFallback && this.layer === 0) {
Sortable.active._onTouchMove(touchEvt); // To move ghost if it is positioned absolutely
}
let scrollOffsetY = autoScrolls[this.layer].vy ? autoScrolls[this.layer].vy * speed : 0;
let scrollOffsetX = autoScrolls[this.layer].vx ? autoScrolls[this.layer].vx * speed : 0;
if (typeof(scrollCustomFn) === 'function') {
if (scrollCustomFn.call(Sortable.dragged.parentNode[expando], scrollOffsetX, scrollOffsetY, evt, touchEvt, autoScrolls[this.layer].el) !== 'continue') {
return;
}
}
scrollBy(autoScrolls[this.layer].el, scrollOffsetX, scrollOffsetY);
}).bind({layer: layersOut}), 24);
}
}
layersOut++;
} while (options.bubbleScroll && currentParent !== winScroller && (currentParent = getParentAutoScrollElement(currentParent, false)));
scrolling = scrollThisInstance; // in case another function catches scrolling as false in between when it is not
}, 30);
export default AutoScrollPlugin;
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