Pull request #3717: BI-137665 fix: 代码优化

Merge in VISUAL/fineui from ~IMP/fineui_fui:master to master

* commit '813e72756b213167f77feb99d9f10b15207e059a':
  BI-137665 fix: 代码优化

packages/fineui/src/base/layer/layer.popover.js

@@ -64,30 +64,7 @@ export class Popover extends Widget {
         // var self = this;
         const { header, headerHeight, closable, logic, footer, footerHeight, body, bodyTgap, bodyHgap } = this.options;
         const c = this._constant;
-        this.startX = 0;
-        this.startY = 0;
         const size = this._calculateSize();
-        const bodyDom = getOuterBody();
-        this.tracker = new MouseMoveTracker(
-            (deltaX, deltaY) => {
-                const W = Widget._renderEngine.createElement(bodyDom).width();
-                const H = Widget._renderEngine.createElement(bodyDom).height();
-                this.startX += deltaX;
-                this.startY += deltaY;
-                this.element.css({
-                    left: `${clamp(this.startX, 0, W - this.element.width())}px`,
-                    top: `${clamp(this.startY, 0, H - this.element.height())}px`,
-                });
-                // BI-12134 没有什么特别好的方法
-                Resizers._resize({
-                    target: this.element[0],
-                });
-            },
-            () => {
-                this.tracker.releaseMouseMoves();
-            },
-            _global
-        );
         const items = [
             {
                 el: {
@@ -219,7 +196,30 @@ export class Popover extends Widget {
 
     // mounted之后绑定事件
     mounted() {
-        this.dragger.element.mousedown(e => {
+        this.startX = 0;
+        this.startY = 0;
+        const bodyDom = getOuterBody();
+        this.tracker = new MouseMoveTracker(
+            (deltaX, deltaY) => {
+                const W = Widget._renderEngine.createElement(bodyDom).width();
+                const H = Widget._renderEngine.createElement(bodyDom).height();
+                this.startX += deltaX;
+                this.startY += deltaY;
+                this.element.css({
+                    left: `${clamp(this.startX, 0, W - this.element.width())}px`,
+                    top: `${clamp(this.startY, 0, H - this.element.height())}px`,
+                });
+                // BI-12134 没有什么特别好的方法
+                Resizers._resize({
+                    target: this.element[0],
+                });
+            },
+            () => {
+                this.tracker.releaseMouseMoves();
+            },
+            _global
+        );
+        this.dragger?.element.mousedown(e => {
             if (this.options.draggable !== false) {
                 this.startX = this.element[0].offsetLeft;
                 this.startY = this.element[0].offsetTop;