devextreme
Version:
HTML5 JavaScript Component Suite for Responsive Web Development
51 lines (50 loc) • 1.8 kB
JavaScript
/**
* DevExtreme (esm/__internal/ui/scroll_view/utils/get_boundary_props.js)
* Version: 24.2.7
* Build date: Mon Apr 28 2025
*
* Copyright (c) 2012 - 2025 Developer Express Inc. ALL RIGHTS RESERVED
* Read about DevExtreme licensing here: https://js.devexpress.com/Licensing/
*/
import {
getScrollLeftMax
} from "./get_scroll_left_max";
import {
getScrollTopMax
} from "./get_scroll_top_max";
import {
ScrollDirection
} from "./scroll_direction";
export function isReachedLeft(scrollOffsetLeft, epsilon) {
return Math.round(scrollOffsetLeft) <= epsilon
}
export function isReachedRight(element, scrollOffsetLeft, epsilon) {
return Math.round(getScrollLeftMax(element) - scrollOffsetLeft) <= epsilon
}
export function isReachedTop(scrollOffsetTop, epsilon) {
return Math.round(scrollOffsetTop) <= epsilon
}
export function isReachedBottom(element, scrollOffsetTop, pocketHeight, epsilon) {
return Math.round(getScrollTopMax(element) - scrollOffsetTop - pocketHeight) <= epsilon
}
export function getBoundaryProps(direction, scrollOffset, element) {
let pocketHeight = arguments.length > 3 && void 0 !== arguments[3] ? arguments[3] : 0;
const {
left: left,
top: top
} = scrollOffset;
const boundaryProps = {};
const {
isHorizontal: isHorizontal,
isVertical: isVertical
} = new ScrollDirection(direction);
if (isHorizontal) {
boundaryProps.reachedLeft = isReachedLeft(left, 0);
boundaryProps.reachedRight = isReachedRight(element, left, 0)
}
if (isVertical) {
boundaryProps.reachedTop = isReachedTop(top, 0);
boundaryProps.reachedBottom = isReachedBottom(element, top, pocketHeight, 0)
}
return boundaryProps
}