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support mobile #32

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93 changes: 55 additions & 38 deletions dragscroll.js
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,12 @@
* @copyright 2015 asvd <[email protected]>
*/

function fixTouches(e) {
if(e.touches) {
e.clientX = e.touches[0].clientX;
e.clientY = e.touches[0].clientY;
}
}

(function (root, factory) {
if (typeof define === 'function' && define.amd) {
Expand All @@ -18,9 +24,9 @@
}(this, function (exports) {
var _window = window;
var _document = document;
var mousemove = 'mousemove';
var mouseup = 'mouseup';
var mousedown = 'mousedown';
var mousemove = 'mousemove touchmove';
var mouseup = 'mouseup touchend';
var mousedown = 'mousedown touchstart';
var EventListener = 'EventListener';
var addEventListener = 'add'+EventListener;
var removeEventListener = 'remove'+EventListener;
Expand All @@ -32,50 +38,61 @@
el = dragged[i++];
el = el.container || el;
el[removeEventListener](mousedown, el.md, 0);
_window[removeEventListener](mouseup, el.mu, 0);
_window[removeEventListener](mousemove, el.mm, 0);
mouseup.split(' ').forEach(function(ev) {
_window[removeEventListener](ev, el.mu, 0);
});
mousemove.split(' ').forEach(function(ev) {
_window[removeEventListener](ev, el.mm, 0);
});
}

// cloning into array since HTMLCollection is updated dynamically
dragged = [].slice.call(_document.getElementsByClassName('dragscroll'));
for (i = 0; i < dragged.length;) {
(function(el, lastClientX, lastClientY, pushed, scroller, cont){
(cont = el.container || el)[addEventListener](
mousedown,
cont.md = function(e) {
if (!el.hasAttribute('nochilddrag') ||
_document.elementFromPoint(
e.pageX, e.pageY
) == cont
) {
pushed = 1;
lastClientX = e.clientX;
lastClientY = e.clientY;

e.preventDefault();
}
}, 0
);
mousedown.split(' ').forEach(function(ev) {
(cont = el.container || el)[addEventListener](
ev,
cont.md = function(e) {
fixTouches(e);
if (!el.hasAttribute('nochilddrag') ||
_document.elementFromPoint(
e.pageX, e.pageY
) == cont
) {
pushed = 1;
lastClientX = e.clientX;
lastClientY = e.clientY;

_window[addEventListener](
mouseup, cont.mu = function() {pushed = 0;}, 0
);
e.preventDefault();
}
}, 0
);
});

_window[addEventListener](
mousemove,
cont.mm = function(e) {
if (pushed) {
(scroller = el.scroller||el).scrollLeft -=
newScrollX = (- lastClientX + (lastClientX=e.clientX));
scroller.scrollTop -=
newScrollY = (- lastClientY + (lastClientY=e.clientY));
if (el == _document.body) {
(scroller = _document.documentElement).scrollLeft -= newScrollX;
scroller.scrollTop -= newScrollY;
mouseup.split(' ').forEach(function(ev) {
_window[addEventListener](
ev, cont.mu = function() {pushed = 0;}, 0
);
});
mousemove.split(' ').forEach(function(ev) {
_window[addEventListener](
ev,
cont.mm = function(e) {
fixTouches(e);
if (pushed) {
(scroller = el.scroller||el).scrollLeft -=
newScrollX = (- lastClientX + (lastClientX=e.clientX));
scroller.scrollTop -=
newScrollY = (- lastClientY + (lastClientY=e.clientY));
if (el == _document.body) {
(scroller = _document.documentElement).scrollLeft -= newScrollX;
scroller.scrollTop -= newScrollY;
}
}
}
}, 0
);
}, 0
);
});
})(dragged[i++]);
}
}
Expand Down