devextreme
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JavaScript/TypeScript Component Suite for Responsive Web Development
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JavaScript
/**
* DevExtreme (esm/__internal/ui/text_box/utils.scroll.js)
* Version: 25.2.5
* Build date: Fri Feb 20 2026
*
* Copyright (c) 2012 - 2026 Developer Express Inc. ALL RIGHTS RESERVED
* Read about DevExtreme licensing here: https://js.devexpress.com/Licensing/
*/
import {
isDxMouseWheelEvent
} from "../../../common/core/events/utils/index";
import $ from "../../../core/renderer";
export const allowScroll = (container, delta, shiftKey) => {
const $container = $(container);
const scrollTopPos = parseFloat(shiftKey ? $container.scrollLeft() : $container.scrollTop());
const prop = shiftKey ? "Width" : "Height";
const scrollSize = parseFloat($container.prop(`scroll${prop}`));
const clientSize = parseFloat($container.prop(`client${prop}`));
const scrollBottomPos = Math.trunc(scrollSize - clientSize - scrollTopPos);
if (0 === scrollTopPos && 0 === scrollBottomPos) {
return false
}
const isScrollFromTop = 0 === scrollTopPos && delta >= 0;
const isScrollFromBottom = 0 === scrollBottomPos && delta <= 0;
const isScrollFromMiddle = scrollTopPos > 0 && scrollBottomPos > 0;
if (isScrollFromTop || isScrollFromBottom || isScrollFromMiddle) {
return true
}
return
};
export const prepareScrollData = (container, validateTarget) => {
const $container = $(container);
const scrollData = {
validate: e => {
if (isDxMouseWheelEvent(e) && (eventTarget = e.target, validateTarget ? $(eventTarget).is(container) : true)) {
if (allowScroll($container, -(e.delta ?? 0), e.shiftKey)) {
e._needSkipEvent = true;
return true
}
return false
}
var eventTarget;
return false
}
};
return scrollData
};