mind.svg.js
Version:
Display and operate MindMap using SVG in browser
87 lines (82 loc) • 2.9 kB
JavaScript
// 基础类列表
const BasicClassList = {};
/**
* 对类做扩展
* @param {*} _className 类的名称
* @param {*} _extension 扩展项的key-value对象
*/
export function extend(_className, _extension) {
if (_extension && (_className in BasicClassList)) {
const classObj = BasicClassList[_className];
(typeof _extension === "function") && (_extension = _extension(classObj));
const oldValue = {};
for (let name in _extension) {
const value = _extension[name];
oldValue[name] = classObj[name];
classObj[name] = value;
}
return oldValue;
}
}
/**
* 扩展类的原型链
* @param {*} _className 类的名称
* @param {*} _extension 扩展项的key-value对象
*/
export function extendPrototype(_className, _extension) {
if (_className in BasicClassList) {
const classObj = BasicClassList[_className];
const prototype = classObj.prototype;
(typeof _extension === "function") && (_extension = _extension(classObj, prototype));
const oldValue = {};
for (let name in _extension) {
const value = _extension[name];
oldValue[name] = prototype[name];
prototype[name] = value;
}
return oldValue;
}
}
/**
* 扩展类的事件响应函数
* @param {*} _className 类的名称
* @param {*} _extension 扩展项的key-value对象
* @param {*} _exclusive 是否独占改事件
*/
export function extendEventHandler(_className, _extension, _exclusive) {
if (_extension && (_className in BasicClassList)) {
const classObj = BasicClassList[_className];
const prototype = classObj.prototype;
(typeof _extension === "function") && (_extension = _extension(classObj, prototype));
const oldValues = {};
for (let name in _extension) {
const value = _extension[name];
const old = (oldValues[name] = prototype[name]);
if (old && (!_exclusive)) {
if (old instanceof Array) {
old.unshift(value);
} else {
prototype[name] = [value, old];
}
} else {
prototype[name] = value;
}
}
return oldValues;
}
}
/**
* 注册可扩展类
* @param {*} _nameOfMap 类的名称，或者由类名称和类对象组成的数组
* @param {*} _class 当第1个参数时类名称时，该参数是类对象
*/
export function registryClass(_nameOfMap, _class) {
if (typeof _nameOfMap === "string") {
BasicClassList[_nameOfMap] = _class;
} else if (_nameOfMap) {
for (let name in _nameOfMap) {
const value = _nameOfMap[name];
BasicClassList[name] = value;
}
}
}