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import * as CSS from '../lib/css';
import * as DOM from '../lib/dom';
import cls, {
addScrollingClass,
removeScrollingClass,
} from '../lib/class-names';
import updateGeometry from '../update-geometry';
import { toInt } from '../lib/util';
export default function(i) {
bindMouseScrollHandler(i, [
'containerWidth',
'contentWidth',
'pageX',
'railXWidth',
'scrollbarX',
'scrollbarXWidth',
'scrollLeft',
'x',
'scrollbarXRail',
]);
bindMouseScrollHandler(i, [
'containerHeight',
'contentHeight',
'pageY',
'railYHeight',
'scrollbarY',
'scrollbarYHeight',
'scrollTop',
'y',
'scrollbarYRail',
]);
}
function bindMouseScrollHandler(
i,
[
containerHeight,
contentHeight,
pageY,
railYHeight,
scrollbarY,
scrollbarYHeight,
scrollTop,
y,
scrollbarYRail,
]
) {
const element = i.element;
let startingScrollTop = null;
let startingMousePageY = null;
let scrollBy = null;
function mouseMoveHandler(e) {
if (e.touches && e.touches[0]) {
e[pageY] = e.touches[0].pageY;
}
element[scrollTop] =
startingScrollTop + scrollBy * (e[pageY] - startingMousePageY);
addScrollingClass(i, y);
updateGeometry(i);
e.stopPropagation();
if (e.type.startsWith('touch') && e.changedTouches.length > 1) {
e.preventDefault();
}
}
function mouseUpHandler() {
removeScrollingClass(i, y);
i[scrollbarYRail].classList.remove(cls.state.clicking);
i.event.unbind(i.ownerDocument, 'mousemove', mouseMoveHandler);
}
function bindMoves(e, touchMode) {
startingScrollTop = element[scrollTop];
if (touchMode && e.touches) {
e[pageY] = e.touches[0].pageY;
}
startingMousePageY = e[pageY];
scrollBy =
(i[contentHeight] - i[containerHeight]) /
(i[railYHeight] - i[scrollbarYHeight]);
if (!touchMode) {
i.event.bind(i.ownerDocument, 'mousemove', mouseMoveHandler);
i.event.once(i.ownerDocument, 'mouseup', mouseUpHandler);
e.preventDefault();
} else {
i.event.bind(i.ownerDocument, 'touchmove', mouseMoveHandler);
}
i[scrollbarYRail].classList.add(cls.state.clicking);
e.stopPropagation();
}
i.event.bind(i[scrollbarY], 'mousedown', e => {
bindMoves(e);
});
i.event.bind(i[scrollbarY], 'touchstart', e => {
bindMoves(e, true);
});
}