Merge pull request #79719 in DEC/fineui from master to feature/x

* commit '786c1b432cad432c68c0eff8600572ea50157e55':
  DESIGN-4069 fix: button 的 setIcon 不使用 IconChangeButton
  DESIGN-4069 feat: button 增加 setIcon 属性

demo/js/base/button/demo.button.js

@@ -376,6 +376,21 @@ Demo.Button = BI.inherit(BI.Widget, {
                 plain: true,
                 disabled: true
             }
+        }, {
+            el: {
+                type: "bi.button",
+                iconCls: "plus-font",
+                text: "点我，更改图标",
+                handler() {
+                    this.i =  this.i === undefined ? 0 : ++this.i;
+                    const arr = ["text-background-font", "check-mark-ha-font", "close-font", "search-font", "date-change-h-font"];
+                    if(this.i >= arr.length) {
+                        this.i = 0;
+                    }
+                    this.setIcon(arr[this.i]);
+                },
+                height: 24
+            }
         }];
         // BI.each(items, function (i, item) {
         //     item.el.handler = function () {

src/base/single/button/buttons/button.js

@@ -195,6 +195,14 @@
             }
         },
 
+        setIcon: function (cls) {
+            var o = this.options;
+            if(this.icon && o.iconCls !== cls) {
+                this.icon.element.removeClass(o.iconCls).addClass(cls);
+                o.iconCls = cls;
+            }
+        },
+
         doRedMark: function () {
             this.text.doRedMark.apply(this.text, arguments);
         },