tntd
Version:
tntd是基于 TNT Design 设计体系的 React UI 组件库，主要用于研发企业级中后台产品。
202 lines (200 loc) • 7.86 kB
JavaScript
;
function _typeof(o) {
"@babel/helpers - typeof";
return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) {
return typeof o;
} : function (o) {
return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o;
}, _typeof(o);
}
Object.defineProperty(exports, "__esModule", {
value: true
});
exports["default"] = Thumb;
var _classnames = _interopRequireDefault(require("classnames"));
var _react = _interopRequireWildcard(require("react"));
var _Context = _interopRequireDefault(require("./Context"));
var _util = require("./util");
function _getRequireWildcardCache(e) {
if ("function" != typeof WeakMap) return null;
var r = new WeakMap(),
t = new WeakMap();
return (_getRequireWildcardCache = function _getRequireWildcardCache(e) {
return e ? t : r;
})(e);
}
function _interopRequireWildcard(e, r) {
if (!r && e && e.__esModule) return e;
if (null === e || "object" != _typeof(e) && "function" != typeof e) return {
"default": e
};
var t = _getRequireWildcardCache(r);
if (t && t.has(e)) return t.get(e);
var n = {
__proto__: null
},
a = Object.defineProperty && Object.getOwnPropertyDescriptor;
for (var u in e) if ("default" !== u && {}.hasOwnProperty.call(e, u)) {
var i = a ? Object.getOwnPropertyDescriptor(e, u) : null;
i && (i.get || i.set) ? Object.defineProperty(n, u, i) : n[u] = e[u];
}
return n["default"] = e, t && t.set(e, n), n;
}
function _interopRequireDefault(e) {
return e && e.__esModule ? e : {
"default": e
};
}
function _slicedToArray(r, e) {
return _arrayWithHoles(r) || _iterableToArrayLimit(r, e) || _unsupportedIterableToArray(r, e) || _nonIterableRest();
}
function _nonIterableRest() {
throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
}
function _unsupportedIterableToArray(r, a) {
if (r) {
if ("string" == typeof r) return _arrayLikeToArray(r, a);
var t = {}.toString.call(r).slice(8, -1);
return "Object" === t && r.constructor && (t = r.constructor.name), "Map" === t || "Set" === t ? Array.from(r) : "Arguments" === t || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(t) ? _arrayLikeToArray(r, a) : void 0;
}
}
function _arrayLikeToArray(r, a) {
(null == a || a > r.length) && (a = r.length);
for (var e = 0, n = Array(a); e < a; e++) n[e] = r[e];
return n;
}
function _iterableToArrayLimit(r, l) {
var t = null == r ? null : "undefined" != typeof Symbol && r[Symbol.iterator] || r["@@iterator"];
if (null != t) {
var e,
n,
i,
u,
a = [],
f = !0,
o = !1;
try {
if (i = (t = t.call(r)).next, 0 === l) {
if (Object(t) !== t) return;
f = !1;
} else for (; !(f = (e = i.call(t)).done) && (a.push(e.value), a.length !== l); f = !0);
} catch (r) {
o = !0, n = r;
} finally {
try {
if (!f && null != t["return"] && (u = t["return"](), Object(u) !== u)) return;
} finally {
if (o) throw n;
}
}
return a;
}
}
function _arrayWithHoles(r) {
if (Array.isArray(r)) return r;
}
function Thumb(props) {
var _useContext = (0, _react.useContext)(_Context["default"]),
scrollbarElement = _useContext.scrollbarElement,
wrapElement = _useContext.wrapElement;
var instance = (0, _react.useRef)();
var thumb = (0, _react.useRef)();
var _useState = (0, _react.useState)(false),
_useState2 = _slicedToArray(_useState, 2),
visible = _useState2[0],
setVisible = _useState2[1];
// 当作非响应式变量使用
var thumbState = (0, _react.useRef)({});
var cursorDown = (0, _react.useRef)(false);
var cursorLeave = (0, _react.useRef)(false);
var originalOnSelectStart = (0, _react.useRef)(document.onselectstart);
var bar = _util.BAR_MAP[props.vertical ? 'vertical' : 'horizontal'];
(0, _react.useEffect)(function () {
var element = scrollbarElement.current;
element.addEventListener('mousemove', mouseMoveScrollbarHandler);
element.addEventListener('mouseleave', mouseLeaveScrollbarHandler);
return function () {
restoreOnselectstart();
document.removeEventListener('mouseup', mouseUpDocumentHandler);
element.removeEventListener('mousemove', mouseMoveScrollbarHandler);
element.removeEventListener('mouseleave', mouseLeaveScrollbarHandler);
};
}, []);
function mouseMoveScrollbarHandler() {
cursorLeave.current = false;
setVisible(true);
}
function mouseLeaveScrollbarHandler() {
cursorLeave.current = true;
setVisible(cursorDown.current);
}
function getOffsetRatio() {
return Math.pow(instance.current[bar.offset], 2) / wrapElement.current[bar.scrollSize] / props.ratio / thumb.current[bar.offset];
}
function clickTrackHandler(e) {
if (!thumb.current || !instance.current || !wrapElement.current) return;
// 鼠标点击的坐标距离顶端的距离
var offset = Math.abs(e.target.getBoundingClientRect()[bar.direction] - e[bar.client]);
var thumbHalf = thumb.current[bar.offset] / 2;
var thumbPositionPercentage = (offset - thumbHalf) * 100 * getOffsetRatio() / instance.current[bar.offset];
// 直接给scrollTop赋值，就会调用bar组件的handleScroll函数
wrapElement.current[bar.scroll] = thumbPositionPercentage * wrapElement.current[bar.scrollSize] / 100;
}
function clickThumbHandler(e) {
var _a;
e.stopPropagation();
if (e.ctrlKey || [1, 2].includes(e.button)) return;
(_a = window.getSelection()) === null || _a === void 0 ? void 0 : _a.removeAllRanges();
startDrag(e);
var el = e.currentTarget;
if (!el) return;
thumbState.current[bar.axis] = el[bar.offset] - (e[bar.client] - el.getBoundingClientRect()[bar.direction]);
}
function startDrag(e) {
e.persist();
cursorDown.current = true;
document.addEventListener('mousemove', mouseMoveDocumentHandler);
document.addEventListener('mouseup', mouseUpDocumentHandler);
originalOnSelectStart.current = document.onselectstart;
document.onselectstart = function () {
return false;
};
}
function mouseMoveDocumentHandler(e) {
if (!instance.current || !thumb.current) return;
if (cursorDown.current === false) return;
var prevPage = thumbState.current[bar.axis];
if (!prevPage) return;
var offset = (instance.current.getBoundingClientRect()[bar.direction] - e[bar.client]) * -1;
var thumbClickPosition = thumb.current[bar.offset] - prevPage;
var thumbPositionPercentage = (offset - thumbClickPosition) * 100 * getOffsetRatio() / instance.current[bar.offset];
wrapElement.current[bar.scroll] = thumbPositionPercentage * wrapElement.current[bar.scrollSize] / 100;
}
function mouseUpDocumentHandler() {
cursorDown.current = false;
thumbState.current[bar.axis] = 0;
document.removeEventListener('mousemove', mouseMoveDocumentHandler);
document.removeEventListener('mouseup', mouseUpDocumentHandler);
restoreOnselectstart();
if (cursorLeave.current) setVisible(false);
}
function restoreOnselectstart() {
if (document.onselectstart !== originalOnSelectStart.current) document.onselectstart = originalOnSelectStart.current;
}
var thumbStyle = (0, _util.renderThumbStyle)({
size: props.size,
move: props.move,
bar: bar
});
return _react["default"].createElement("div", {
hidden: !(props.always || visible),
className: (0, _classnames["default"])('tntd-scroll-bar-bar', bar.key),
ref: instance,
onMouseDown: clickTrackHandler
}, _react["default"].createElement("div", {
className: "tntd-scroll-bar-thumb",
style: thumbStyle,
ref: thumb,
onMouseDown: clickThumbHandler
}));
}