devextreme
Version:
HTML5 JavaScript Component Suite for Responsive Web Development
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JavaScript
/**
* DevExtreme (esm/__internal/ui/text_box/m_utils.scroll.js)
* Version: 24.2.6
* Build date: Mon Mar 17 2025
*
* Copyright (c) 2012 - 2025 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";
const allowScroll = function(container, delta, shiftKey) {
const $container = $(container);
const scrollTopPos = shiftKey ? $container.scrollLeft() : $container.scrollTop();
const prop = shiftKey ? "Width" : "Height";
const scrollSize = $container.prop(`scroll${prop}`);
const clientSize = $container.prop(`client${prop}`);
const scrollBottomPos = scrollSize - clientSize - scrollTopPos | 0;
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
}
};
const prepareScrollData = function(container, validateTarget) {
const $container = $(container);
return {
validate(e) {
if (isDxMouseWheelEvent(e) && (eventTarget = e.target, validateTarget ? $(eventTarget).is(container) : true)) {
if (allowScroll($container, -e.delta, e.shiftKey)) {
e._needSkipEvent = true;
return true
}
return false
}
var eventTarget
}
}
};
export {
allowScroll,
prepareScrollData
};