devextreme
Version:
HTML5 JavaScript Component Suite for Responsive Web Development
57 lines (55 loc) • 2.15 kB
JavaScript
/**
* DevExtreme (ui/text_box/utils.scroll.js)
* Version: 20.1.7
* Build date: Tue Aug 25 2020
*
* Copyright (c) 2012 - 2020 Developer Express Inc. ALL RIGHTS RESERVED
* Read about DevExtreme licensing here: https://js.devexpress.com/Licensing/
*/
;
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.prepareScrollData = exports.allowScroll = void 0;
var _renderer = require("../../core/renderer");
var _renderer2 = _interopRequireDefault(_renderer);
var _utils = require("../../events/utils");
function _interopRequireDefault(obj) {
return obj && obj.__esModule ? obj : {
"default": obj
}
}
var allowScroll = function(container, delta, shiftKey) {
var $container = (0, _renderer2.default)(container);
var scrollTopPos = shiftKey ? $container.scrollLeft() : $container.scrollTop();
var prop = shiftKey ? "Width" : "Height";
var scrollBottomPos = $container.prop("scroll".concat(prop)) - $container.prop("client".concat(prop)) - scrollTopPos;
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 $container = (0, _renderer2.default)(container);
var isCorrectTarget = function(eventTarget) {
return validateTarget ? (0, _renderer2.default)(eventTarget).is(container) : true
};
return {
validate: function(e) {
if ((0, _utils.isDxMouseWheelEvent)(e) && isCorrectTarget(e.target)) {
if (allowScroll($container, -e.delta, e.shiftKey)) {
e._needSkipEvent = true;
return true
}
return false
}
}
}
};
exports.allowScroll = allowScroll;
exports.prepareScrollData = prepareScrollData;