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/**
* 事件扩展
* @module zrender/mixin/Eventful
* @author Kener (@Kener-林峰, kener.linfeng@gmail.com)
* pissang (https://www.github.com/pissang)
*/
define(function (require) {
/**
* 事件分发器
* @alias module:zrender/mixin/Eventful
* @constructor
*/
var Eventful = function () {
this._handlers = {};
};
/**
* 单次触发绑定，dispatch后销毁
*
* @param {string} event 事件名
* @param {Function} handler 响应函数
* @param {Object} context
*/
Eventful.prototype.one = function (event, handler, context) {
var _h = this._handlers;
if (!handler || !event) {
return this;
}
if (!_h[event]) {
_h[event] = [];
}
_h[event].push({
h : handler,
one : true,
ctx: context || this
});
return this;
};
/**
* 绑定事件
* @param {string} event 事件名
* @param {Function} handler 事件处理函数
* @param {Object} [context]
*/
Eventful.prototype.bind = function (event, handler, context) {
var _h = this._handlers;
if (!handler || !event) {
return this;
}
if (!_h[event]) {
_h[event] = [];
}
_h[event].push({
h : handler,
one : false,
ctx: context || this
});
return this;
};
/**
* 解绑事件
* @param {string} event 事件名
* @param {Function} [handler] 事件处理函数
*/
Eventful.prototype.unbind = function (event, handler) {
var _h = this._handlers;
if (!event) {
this._handlers = {};
return this;
}
if (handler) {
if (_h[event]) {
var newList = [];
for (var i = 0, l = _h[event].length; i < l; i++) {
if (_h[event][i]['h'] != handler) {
newList.push(_h[event][i]);
}
}
_h[event] = newList;
}
if (_h[event] && _h[event].length === 0) {
delete _h[event];
}
}
else {
delete _h[event];
}
return this;
};
/**
* 事件分发
*
* @param {string} type 事件类型
*/
Eventful.prototype.dispatch = function (type) {
if (this._handlers[type]) {
var args = arguments;
var argLen = args.length;
if (argLen > 3) {
args = Array.prototype.slice.call(args, 1);
}
var _h = this._handlers[type];
var len = _h.length;
for (var i = 0; i < len;) {
// Optimize advise from backbone
switch (argLen) {
case 1:
_h[i]['h'].call(_h[i]['ctx']);
break;
case 2:
_h[i]['h'].call(_h[i]['ctx'], args[1]);
break;
case 3:
_h[i]['h'].call(_h[i]['ctx'], args[1], args[2]);
break;
default:
// have more than 2 given arguments
_h[i]['h'].apply(_h[i]['ctx'], args);
break;
}
if (_h[i]['one']) {
_h.splice(i, 1);
len--;
}
else {
i++;
}
}
}
return this;
};
/**
* 带有context的事件分发, 最后一个参数是事件回调的context
* @param {string} type 事件类型
*/
Eventful.prototype.dispatchWithContext = function (type) {
if (this._handlers[type]) {
var args = arguments;
var argLen = args.length;
if (argLen > 4) {
args = Array.prototype.slice.call(args, 1, args.length - 1);
}
var ctx = args[args.length - 1];
var _h = this._handlers[type];
var len = _h.length;
for (var i = 0; i < len;) {
// Optimize advise from backbone
switch (argLen) {
case 1:
_h[i]['h'].call(ctx);
break;
case 2:
_h[i]['h'].call(ctx, args[1]);
break;
case 3:
_h[i]['h'].call(ctx, args[1], args[2]);
break;
default:
// have more than 2 given arguments
_h[i]['h'].apply(ctx, args);
break;
}
if (_h[i]['one']) {
_h.splice(i, 1);
len--;
}
else {
i++;
}
}
}
return this;
};
// 对象可以通过 onxxxx 绑定事件
/**
* @event module:zrender/mixin/Eventful#onclick
* @type {Function}
* @default null
*/
/**
* @event module:zrender/mixin/Eventful#onmouseover
* @type {Function}
* @default null
*/
/**
* @event module:zrender/mixin/Eventful#onmouseout
* @type {Function}
* @default null
*/
/**
* @event module:zrender/mixin/Eventful#onmousemove
* @type {Function}
* @default null
*/
/**
* @event module:zrender/mixin/Eventful#onmousewheel
* @type {Function}
* @default null
*/
/**
* @event module:zrender/mixin/Eventful#onmousedown
* @type {Function}
* @default null
*/
/**
* @event module:zrender/mixin/Eventful#onmouseup
* @type {Function}
* @default null
*/
/**
* @event module:zrender/mixin/Eventful#ondragstart
* @type {Function}
* @default null
*/
/**
* @event module:zrender/mixin/Eventful#ondragend
* @type {Function}
* @default null
*/
/**
* @event module:zrender/mixin/Eventful#ondragenter
* @type {Function}
* @default null
*/
/**
* @event module:zrender/mixin/Eventful#ondragleave
* @type {Function}
* @default null
*/
/**
* @event module:zrender/mixin/Eventful#ondragover
* @type {Function}
* @default null
*/
/**
* @event module:zrender/mixin/Eventful#ondrop
* @type {Function}
* @default null
*/
return Eventful;
});