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import * as CSS from './lib/css';
import * as DOM from './lib/dom';
import cls from './lib/class-names';
import { toInt } from './lib/util';
export default function(i) {
const element = i.element;
const roundedScrollTop = Math.floor(element.scrollTop);
const rect = element.getBoundingClientRect();
i.containerWidth = Math.round(rect.width);
i.containerHeight = Math.round(rect.height);
i.contentWidth = element.scrollWidth;
i.contentHeight = element.scrollHeight;
if (!element.contains(i.scrollbarXRail)) {
// clean up and append
DOM.queryChildren(element, cls.element.rail('x')).forEach(el =>
DOM.remove(el)
);
element.appendChild(i.scrollbarXRail);
}
if (!element.contains(i.scrollbarYRail)) {
// clean up and append
DOM.queryChildren(element, cls.element.rail('y')).forEach(el =>
DOM.remove(el)
);
element.appendChild(i.scrollbarYRail);
}
if (
!i.settings.suppressScrollX &&
i.containerWidth + i.settings.scrollXMarginOffset < i.contentWidth
) {
i.scrollbarXActive = true;
i.railXWidth = i.containerWidth - i.railXMarginWidth;
i.railXRatio = i.containerWidth / i.railXWidth;
i.scrollbarXWidth = getThumbSize(
i,
toInt((i.railXWidth * i.containerWidth) / i.contentWidth)
);
i.scrollbarXLeft = toInt(
((i.negativeScrollAdjustment + element.scrollLeft) *
(i.railXWidth - i.scrollbarXWidth)) /
(i.contentWidth - i.containerWidth)
);
} else {
i.scrollbarXActive = false;
}
if (
!i.settings.suppressScrollY &&
i.containerHeight + i.settings.scrollYMarginOffset < i.contentHeight
) {
i.scrollbarYActive = true;
i.railYHeight = i.containerHeight - i.railYMarginHeight;
i.railYRatio = i.containerHeight / i.railYHeight;
i.scrollbarYHeight = getThumbSize(
i,
toInt((i.railYHeight * i.containerHeight) / i.contentHeight)
);
i.scrollbarYTop = toInt(
(roundedScrollTop * (i.railYHeight - i.scrollbarYHeight)) /
(i.contentHeight - i.containerHeight)
);
} else {
i.scrollbarYActive = false;
}
if (i.scrollbarXLeft >= i.railXWidth - i.scrollbarXWidth) {
i.scrollbarXLeft = i.railXWidth - i.scrollbarXWidth;
}
if (i.scrollbarYTop >= i.railYHeight - i.scrollbarYHeight) {
i.scrollbarYTop = i.railYHeight - i.scrollbarYHeight;
}
updateCss(element, i);
if (i.scrollbarXActive) {
element.classList.add(cls.state.active('x'));
} else {
element.classList.remove(cls.state.active('x'));
i.scrollbarXWidth = 0;
i.scrollbarXLeft = 0;
element.scrollLeft = i.isRtl === true ? i.contentWidth : 0;
}
if (i.scrollbarYActive) {
element.classList.add(cls.state.active('y'));
} else {
element.classList.remove(cls.state.active('y'));
i.scrollbarYHeight = 0;
i.scrollbarYTop = 0;
element.scrollTop = 0;
}
}
function getThumbSize(i, thumbSize) {
if (i.settings.minScrollbarLength) {
thumbSize = Math.max(thumbSize, i.settings.minScrollbarLength);
}
if (i.settings.maxScrollbarLength) {
thumbSize = Math.min(thumbSize, i.settings.maxScrollbarLength);
}
return thumbSize;
}
function updateCss(element, i) {
const xRailOffset = { width: i.railXWidth };
const roundedScrollTop = Math.floor(element.scrollTop);
if (i.isRtl) {
xRailOffset.left =
i.negativeScrollAdjustment +
element.scrollLeft +
i.containerWidth -
i.contentWidth;
} else {
xRailOffset.left = element.scrollLeft;
}
if (i.isScrollbarXUsingBottom) {
xRailOffset.bottom = i.scrollbarXBottom - roundedScrollTop;
} else {
xRailOffset.top = i.scrollbarXTop + roundedScrollTop;
}
CSS.set(i.scrollbarXRail, xRailOffset);
const yRailOffset = { top: roundedScrollTop, height: i.railYHeight };
if (i.isScrollbarYUsingRight) {
if (i.isRtl) {
yRailOffset.right =
i.contentWidth -
(i.negativeScrollAdjustment + element.scrollLeft) -
i.scrollbarYRight -
i.scrollbarYOuterWidth -
9;
} else {
yRailOffset.right = i.scrollbarYRight - element.scrollLeft;
}
} else {
if (i.isRtl) {
yRailOffset.left =
i.negativeScrollAdjustment +
element.scrollLeft +
i.containerWidth * 2 -
i.contentWidth -
i.scrollbarYLeft -
i.scrollbarYOuterWidth;
} else {
yRailOffset.left = i.scrollbarYLeft + element.scrollLeft;
}
}
CSS.set(i.scrollbarYRail, yRailOffset);
CSS.set(i.scrollbarX, {
left: i.scrollbarXLeft,
width: i.scrollbarXWidth - i.railBorderXWidth,
});
CSS.set(i.scrollbarY, {
top: i.scrollbarYTop,
height: i.scrollbarYHeight - i.railBorderYWidth,
});
}