(function() {
  var browser = baidu.editor.browser,
    domUtils = baidu.editor.dom.domUtils,
    uiUtils = baidu.editor.ui.uiUtils;

  var TPL_STATEFUL =
    'onmousedown="$$.Stateful_onMouseDown(event, this);"' +
    ' onmouseup="$$.Stateful_onMouseUp(event, this);"' +
    (browser.ie
      ? ' onmouseenter="$$.Stateful_onMouseEnter(event, this);"' +
          ' onmouseleave="$$.Stateful_onMouseLeave(event, this);"'
      : ' onmouseover="$$.Stateful_onMouseOver(event, this);"' +
          ' onmouseout="$$.Stateful_onMouseOut(event, this);"');

  baidu.editor.ui.Stateful = {
    alwalysHoverable: false,
    target: null, //目标元素和this指向dom不一样
    Stateful_init: function() {
      this._Stateful_dGetHtmlTpl = this.getHtmlTpl;
      this.getHtmlTpl = this.Stateful_getHtmlTpl;
    },
    Stateful_getHtmlTpl: function() {
      var tpl = this._Stateful_dGetHtmlTpl();
      // 使用function避免$转义
      return tpl.replace(/stateful/g, function() {
        return TPL_STATEFUL;
      });
    },
    Stateful_onMouseEnter: function(evt, el) {
      this.target = el;
      if (!this.isDisabled() || this.alwalysHoverable) {
        this.addState("hover");
        this.fireEvent("over");
      }
    },
    Stateful_onMouseLeave: function(evt, el) {
      if (!this.isDisabled() || this.alwalysHoverable) {
        this.removeState("hover");
        this.removeState("active");
        this.fireEvent("out");
      }
    },
    Stateful_onMouseOver: function(evt, el) {
      var rel = evt.relatedTarget;
      if (!uiUtils.contains(el, rel) && el !== rel) {
        this.Stateful_onMouseEnter(evt, el);
      }
    },
    Stateful_onMouseOut: function(evt, el) {
      var rel = evt.relatedTarget;
      if (!uiUtils.contains(el, rel) && el !== rel) {
        this.Stateful_onMouseLeave(evt, el);
      }
    },
    Stateful_onMouseDown: function(evt, el) {
      if (!this.isDisabled()) {
        this.addState("active");
      }
    },
    Stateful_onMouseUp: function(evt, el) {
      if (!this.isDisabled()) {
        this.removeState("active");
      }
    },
    Stateful_postRender: function() {
      if (this.disabled && !this.hasState("disabled")) {
        this.addState("disabled");
      }
    },
    hasState: function(state) {
      return domUtils.hasClass(this.getStateDom(), "edui-state-" + state);
    },
    addState: function(state) {
      if (!this.hasState(state)) {
        this.getStateDom().className += " edui-state-" + state;
      }
    },
    removeState: function(state) {
      if (this.hasState(state)) {
        domUtils.removeClasses(this.getStateDom(), ["edui-state-" + state]);
      }
    },
    getStateDom: function() {
      return this.getDom("state");
    },
    isChecked: function() {
      return this.hasState("checked");
    },
    setChecked: function(checked) {
      if (!this.isDisabled() && checked) {
        this.addState("checked");
      } else {
        this.removeState("checked");
      }
    },
    isDisabled: function() {
      return this.hasState("disabled");
    },
    setDisabled: function(disabled) {
      if (disabled) {
        this.removeState("hover");
        this.removeState("checked");
        this.removeState("active");
        this.addState("disabled");
      } else {
        this.removeState("disabled");
      }
    }
  };
})();