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dragula.js
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dragula.js
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'use strict';
var emitter = require('contra/emitter');
var crossvent = require('crossvent');
var classes = require('./classes');
var doc = document;
var documentElement = doc.documentElement;
function dragula (initialContainers, options) {
var len = arguments.length;
if (len === 1 && Array.isArray(initialContainers) === false) {
options = initialContainers;
initialContainers = [];
}
var _mirror; // mirror image
var _source; // source container
var _item; // item being dragged
var _offsetX; // reference x
var _offsetY; // reference y
var _moveX; // reference move x
var _moveY; // reference move y
var _initialSibling; // reference sibling when grabbed
var _currentSibling; // reference sibling now
var _copy; // item used for copying
var _renderTimer; // timer for setTimeout renderMirrorImage
var _lastDropTarget = null; // last container item was over
var _grabbed; // holds mousedown context until first mousemove
var o = options || {};
if (o.moves === void 0) { o.moves = always; }
if (o.accepts === void 0) { o.accepts = always; }
if (o.invalid === void 0) { o.invalid = invalidTarget; }
if (o.containers === void 0) { o.containers = initialContainers || []; }
if (o.isContainer === void 0) { o.isContainer = never; }
if (o.copy === void 0) { o.copy = false; }
if (o.copySortSource === void 0) { o.copySortSource = false; }
if (o.revertOnSpill === void 0) { o.revertOnSpill = false; }
if (o.removeOnSpill === void 0) { o.removeOnSpill = false; }
if (o.direction === void 0) { o.direction = 'vertical'; }
if (o.ignoreInputTextSelection === void 0) { o.ignoreInputTextSelection = true; }
if (o.mirrorContainer === void 0) { o.mirrorContainer = doc.body; }
var drake = emitter({
containers: o.containers,
start: manualStart,
end: end,
cancel: cancel,
remove: remove,
destroy: destroy,
canMove: canMove,
dragging: false
});
if (o.removeOnSpill === true) {
drake.on('over', spillOver).on('out', spillOut);
}
events();
return drake;
function isContainer (el) {
return drake.containers.indexOf(el) !== -1 || o.isContainer(el);
}
function events (remove) {
var op = remove ? 'remove' : 'add';
touchy(documentElement, op, 'mousedown', grab);
touchy(documentElement, op, 'mouseup', release);
}
function eventualMovements (remove) {
var op = remove ? 'remove' : 'add';
touchy(documentElement, op, 'mousemove', startBecauseMouseMoved);
}
function movements (remove) {
var op = remove ? 'remove' : 'add';
crossvent[op](documentElement, 'selectstart', preventGrabbed); // IE8
crossvent[op](documentElement, 'click', preventGrabbed);
}
function destroy () {
events(true);
release({});
}
function preventGrabbed (e) {
if (_grabbed) {
e.preventDefault();
}
}
function grab (e) {
_moveX = e.clientX;
_moveY = e.clientY;
var ignore = whichMouseButton(e) !== 1 || e.metaKey || e.ctrlKey;
if (ignore) {
return; // we only care about honest-to-god left clicks and touch events
}
var item = e.target;
var context = canStart(item);
if (!context) {
return;
}
_grabbed = context;
eventualMovements();
if (e.type === 'mousedown') {
if (isInput(item)) { // see also: https://github.com/bevacqua/dragula/issues/208
item.focus(); // fixes https://github.com/bevacqua/dragula/issues/176
} else {
e.preventDefault(); // fixes https://github.com/bevacqua/dragula/issues/155
}
}
}
function startBecauseMouseMoved (e) {
if (!_grabbed) {
return;
}
if (whichMouseButton(e) === 0) {
release({});
return; // when text is selected on an input and then dragged, mouseup doesn't fire. this is our only hope
}
// truthy check fixes #239, equality fixes #207
if (e.clientX !== void 0 && e.clientX === _moveX && e.clientY !== void 0 && e.clientY === _moveY) {
return;
}
if (o.ignoreInputTextSelection) {
var clientX = getCoord('clientX', e);
var clientY = getCoord('clientY', e);
var elementBehindCursor = doc.elementFromPoint(clientX, clientY);
if (isInput(elementBehindCursor)) {
return;
}
}
var grabbed = _grabbed; // call to end() unsets _grabbed
eventualMovements(true);
movements();
end();
start(grabbed);
var offset = getOffset(_item);
_offsetX = getCoord('pageX', e) - offset.left;
_offsetY = getCoord('pageY', e) - offset.top;
classes.add(_copy || _item, 'gu-transit');
renderMirrorImage();
drag(e);
}
function canStart (item) {
if (drake.dragging && _mirror) {
return;
}
if (isContainer(item)) {
return; // don't drag container itself
}
var handle = item;
while (getParent(item) && isContainer(getParent(item)) === false) {
if (o.invalid(item, handle)) {
return;
}
item = getParent(item); // drag target should be a top element
if (!item) {
return;
}
}
var source = getParent(item);
if (!source) {
return;
}
if (o.invalid(item, handle)) {
return;
}
var movable = o.moves(item, source, handle, nextEl(item));
if (!movable) {
return;
}
return {
item: item,
source: source
};
}
function canMove (item) {
return !!canStart(item);
}
function manualStart (item) {
var context = canStart(item);
if (context) {
start(context);
}
}
function start (context) {
if (isCopy(context.item, context.source)) {
_copy = context.item.cloneNode(true);
drake.emit('cloned', _copy, context.item, 'copy');
}
_source = context.source;
_item = context.item;
_initialSibling = _currentSibling = nextEl(context.item);
drake.dragging = true;
drake.emit('drag', _item, _source);
}
function invalidTarget () {
return false;
}
function end () {
if (!drake.dragging) {
return;
}
var item = _copy || _item;
drop(item, getParent(item));
}
function ungrab () {
_grabbed = false;
eventualMovements(true);
movements(true);
}
function release (e) {
ungrab();
if (!drake.dragging) {
return;
}
var item = _copy || _item;
var clientX = getCoord('clientX', e);
var clientY = getCoord('clientY', e);
var elementBehindCursor = getElementBehindPoint(_mirror, clientX, clientY);
var dropTarget = findDropTarget(elementBehindCursor, clientX, clientY);
if (dropTarget && ((_copy && o.copySortSource) || (!_copy || dropTarget !== _source))) {
drop(item, dropTarget);
} else if (o.removeOnSpill) {
remove();
} else {
cancel();
}
}
function drop (item, target) {
var parent = getParent(item);
if (_copy && o.copySortSource && target === _source) {
parent.removeChild(_item);
}
if (isInitialPlacement(target)) {
drake.emit('cancel', item, _source, _source);
} else {
drake.emit('drop', item, target, _source, _currentSibling);
}
cleanup();
}
function remove () {
if (!drake.dragging) {
return;
}
var item = _copy || _item;
var parent = getParent(item);
if (parent) {
parent.removeChild(item);
}
drake.emit(_copy ? 'cancel' : 'remove', item, parent, _source);
cleanup();
}
function cancel (revert) {
if (!drake.dragging) {
return;
}
var reverts = arguments.length > 0 ? revert : o.revertOnSpill;
var item = _copy || _item;
var parent = getParent(item);
var initial = isInitialPlacement(parent);
if (initial === false && reverts) {
if (_copy) {
if (parent) {
parent.removeChild(_copy);
}
} else {
_source.insertBefore(item, _initialSibling);
}
}
if (initial || reverts) {
drake.emit('cancel', item, _source, _source);
} else {
drake.emit('drop', item, parent, _source, _currentSibling);
}
cleanup();
}
function cleanup () {
var item = _copy || _item;
ungrab();
removeMirrorImage();
if (item) {
classes.rm(item, 'gu-transit');
}
if (_renderTimer) {
clearTimeout(_renderTimer);
}
drake.dragging = false;
if (_lastDropTarget) {
drake.emit('out', item, _lastDropTarget, _source);
}
drake.emit('dragend', item);
_source = _item = _copy = _initialSibling = _currentSibling = _renderTimer = _lastDropTarget = null;
}
function isInitialPlacement (target, s) {
var sibling;
if (s !== void 0) {
sibling = s;
} else if (_mirror) {
sibling = _currentSibling;
} else {
sibling = nextEl(_copy || _item);
}
return target === _source && sibling === _initialSibling;
}
function findDropTarget (elementBehindCursor, clientX, clientY) {
var target = elementBehindCursor;
while (target && !accepted()) {
target = getParent(target);
}
return target;
function accepted () {
var droppable = isContainer(target);
if (droppable === false) {
return false;
}
var immediate = getImmediateChild(target, elementBehindCursor);
var reference = getReference(target, immediate, clientX, clientY);
var initial = isInitialPlacement(target, reference);
if (initial) {
return true; // should always be able to drop it right back where it was
}
return o.accepts(_item, target, _source, reference);
}
}
function drag (e) {
if (!_mirror) {
return;
}
e.preventDefault();
var clientX = getCoord('clientX', e);
var clientY = getCoord('clientY', e);
var x = clientX - _offsetX;
var y = clientY - _offsetY;
_mirror.style.left = x + 'px';
_mirror.style.top = y + 'px';
var item = _copy || _item;
var elementBehindCursor = getElementBehindPoint(_mirror, clientX, clientY);
var dropTarget = findDropTarget(elementBehindCursor, clientX, clientY);
var changed = dropTarget !== null && dropTarget !== _lastDropTarget;
if (changed || dropTarget === null) {
out();
_lastDropTarget = dropTarget;
over();
}
var parent = getParent(item);
if (dropTarget === _source && _copy && !o.copySortSource) {
if (parent) {
parent.removeChild(item);
}
return;
}
var reference;
var immediate = getImmediateChild(dropTarget, elementBehindCursor);
if (immediate !== null) {
reference = getReference(dropTarget, immediate, clientX, clientY);
} else if (o.revertOnSpill === true && !_copy) {
reference = _initialSibling;
dropTarget = _source;
} else {
if (_copy && parent) {
parent.removeChild(item);
}
return;
}
if (
(reference === null && changed) ||
reference !== item &&
reference !== nextEl(item)
) {
_currentSibling = reference;
dropTarget.insertBefore(item, reference);
drake.emit('shadow', item, dropTarget, _source);
}
function moved (type) { drake.emit(type, item, _lastDropTarget, _source); }
function over () { if (changed) { moved('over'); } }
function out () { if (_lastDropTarget) { moved('out'); } }
}
function spillOver (el) {
classes.rm(el, 'gu-hide');
}
function spillOut (el) {
if (drake.dragging) { classes.add(el, 'gu-hide'); }
}
function renderMirrorImage () {
if (_mirror) {
return;
}
var rect = _item.getBoundingClientRect();
_mirror = _item.cloneNode(true);
_mirror.style.width = getRectWidth(rect) + 'px';
_mirror.style.height = getRectHeight(rect) + 'px';
classes.rm(_mirror, 'gu-transit');
classes.add(_mirror, 'gu-mirror');
o.mirrorContainer.appendChild(_mirror);
touchy(documentElement, 'add', 'mousemove', drag);
classes.add(o.mirrorContainer, 'gu-unselectable');
drake.emit('cloned', _mirror, _item, 'mirror');
}
function removeMirrorImage () {
if (_mirror) {
classes.rm(o.mirrorContainer, 'gu-unselectable');
touchy(documentElement, 'remove', 'mousemove', drag);
getParent(_mirror).removeChild(_mirror);
_mirror = null;
}
}
function getImmediateChild (dropTarget, target) {
var immediate = target;
while (immediate !== dropTarget && getParent(immediate) !== dropTarget) {
immediate = getParent(immediate);
}
if (immediate === documentElement) {
return null;
}
return immediate;
}
function getReference (dropTarget, target, x, y) {
var horizontal = o.direction === 'horizontal';
var reference = target !== dropTarget ? inside() : outside();
return reference;
function outside () { // slower, but able to figure out any position
var len = dropTarget.children.length;
var i;
var el;
var rect;
for (i = 0; i < len; i++) {
el = dropTarget.children[i];
rect = el.getBoundingClientRect();
if (horizontal && (rect.left + rect.width / 2) > x) { return el; }
if (!horizontal && (rect.top + rect.height / 2) > y) { return el; }
}
return null;
}
function inside () { // faster, but only available if dropped inside a child element
var rect = target.getBoundingClientRect();
if (horizontal) {
return resolve(x > rect.left + getRectWidth(rect) / 2);
}
return resolve(y > rect.top + getRectHeight(rect) / 2);
}
function resolve (after) {
return after ? nextEl(target) : target;
}
}
function isCopy (item, container) {
return typeof o.copy === 'boolean' ? o.copy : o.copy(item, container);
}
}
function touchy (el, op, type, fn) {
var touch = {
mouseup: 'touchend',
mousedown: 'touchstart',
mousemove: 'touchmove'
};
var pointers = {
mouseup: 'pointerup',
mousedown: 'pointerdown',
mousemove: 'pointermove'
};
var microsoft = {
mouseup: 'MSPointerUp',
mousedown: 'MSPointerDown',
mousemove: 'MSPointerMove'
};
if (global.navigator.pointerEnabled) {
crossvent[op](el, pointers[type], fn);
} else if (global.navigator.msPointerEnabled) {
crossvent[op](el, microsoft[type], fn);
} else {
crossvent[op](el, touch[type], fn);
crossvent[op](el, type, fn);
}
}
function whichMouseButton (e) {
if (e.touches !== void 0) { return e.touches.length; }
if (e.which !== void 0 && e.which !== 0) { return e.which; } // see https://github.com/bevacqua/dragula/issues/261
if (e.buttons !== void 0) { return e.buttons; }
var button = e.button;
if (button !== void 0) { // see https://github.com/jquery/jquery/blob/99e8ff1baa7ae341e94bb89c3e84570c7c3ad9ea/src/event.js#L573-L575
return button & 1 ? 1 : button & 2 ? 3 : (button & 4 ? 2 : 0);
}
}
function getOffset (el) {
var rect = el.getBoundingClientRect();
return {
left: rect.left + getScroll('scrollLeft', 'pageXOffset'),
top: rect.top + getScroll('scrollTop', 'pageYOffset')
};
}
function getScroll (scrollProp, offsetProp) {
if (typeof global[offsetProp] !== 'undefined') {
return global[offsetProp];
}
if (documentElement.clientHeight) {
return documentElement[scrollProp];
}
return doc.body[scrollProp];
}
function getElementBehindPoint (point, x, y) {
var p = point || {};
var state = p.className;
var el;
p.className += ' gu-hide';
el = doc.elementFromPoint(x, y);
p.className = state;
return el;
}
function never () { return false; }
function always () { return true; }
function getRectWidth (rect) { return rect.width || (rect.right - rect.left); }
function getRectHeight (rect) { return rect.height || (rect.bottom - rect.top); }
function getParent (el) { return el.parentNode === doc ? null : el.parentNode; }
function isInput (el) { return el.tagName === 'INPUT' || el.tagName === 'TEXTAREA' || el.tagName === 'SELECT' || isEditable(el); }
function isEditable (el) {
if (!el) { return false; } // no parents were editable
if (el.contentEditable === 'false') { return false; } // stop the lookup
if (el.contentEditable === 'true') { return true; } // found a contentEditable element in the chain
return isEditable(getParent(el)); // contentEditable is set to 'inherit'
}
function nextEl (el) {
return el.nextElementSibling || manually();
function manually () {
var sibling = el;
do {
sibling = sibling.nextSibling;
} while (sibling && sibling.nodeType !== 1);
return sibling;
}
}
function getEventHost (e) {
// on touchend event, we have to use `e.changedTouches`
// see http://stackoverflow.com/questions/7192563/touchend-event-properties
// see https://github.com/bevacqua/dragula/issues/34
if (e.targetTouches && e.targetTouches.length) {
return e.targetTouches[0];
}
if (e.changedTouches && e.changedTouches.length) {
return e.changedTouches[0];
}
return e;
}
function getCoord (coord, e) {
var host = getEventHost(e);
var missMap = {
pageX: 'clientX', // IE8
pageY: 'clientY' // IE8
};
if (coord in missMap && !(coord in host) && missMap[coord] in host) {
coord = missMap[coord];
}
return host[coord];
}
module.exports = dragula;