devextreme
Version:
HTML5 JavaScript Component Suite for Responsive Web Development
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JavaScript
/**
* DevExtreme (esm/ui/text_box/utils.scroll.js)
* Version: 23.2.6
* Build date: Wed May 01 2024
*
* Copyright (c) 2012 - 2024 Developer Express Inc. ALL RIGHTS RESERVED
* Read about DevExtreme licensing here: https://js.devexpress.com/Licensing/
*/
import $ from "../../core/renderer";
import {
isDxMouseWheelEvent
} from "../../events/utils/index";
var allowScroll = function(container, delta, shiftKey) {
var $container = $(container);
var scrollTopPos = shiftKey ? $container.scrollLeft() : $container.scrollTop();
var prop = shiftKey ? "Width" : "Height";
var scrollSize = $container.prop("scroll".concat(prop));
var clientSize = $container.prop("client".concat(prop));
var scrollBottomPos = scrollSize - clientSize - scrollTopPos | 0;
if (0 === scrollTopPos && 0 === scrollBottomPos) {
return false
}
var isScrollFromTop = 0 === scrollTopPos && delta >= 0;
var isScrollFromBottom = 0 === scrollBottomPos && delta <= 0;
var isScrollFromMiddle = scrollTopPos > 0 && scrollBottomPos > 0;
if (isScrollFromTop || isScrollFromBottom || isScrollFromMiddle) {
return true
}
};
var prepareScrollData = function(container, validateTarget) {
var $container = $(container);
return {
validate: function(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
};