1、SearchAppBar：①增加属性，leftWidget(搜索框左侧自定义widget) ②修改右侧搜索按钮展示隐藏判断

example/android/build.gradle

@@ -26,6 +26,6 @@ subprojects {
     project.evaluationDependsOn(':app')
 }
 
-task clean(type: Delete) {
+tasks.register("clean", Delete) {
     delete rootProject.buildDir
 }

lib/widget/search_app_bar.dart

 import 'package:flutter/material.dart';
-import 'package:flutter_clx_base/common/gaps.dart';
-import 'package:flutter_clx_base/utils/keyboard_utils.dart';
+import 'package:flutter_clx_base/flutter_clx_base.dart';
 import 'package:flutter_clx_base/utils/string_util.dart';
-import 'package:flutter_clx_base/utils/toast_util.dart';
 import 'package:keyboard_actions/keyboard_actions.dart';
 
 class SearchAppBar extends StatefulWidget implements PreferredSizeWidget {
@@ -21,6 +19,7 @@ class SearchAppBar extends StatefulWidget implements PreferredSizeWidget {
   final Function? onFocusListener;
   final String? rightText;
   final Function? onRightBtnCallback;
+  final Widget? leftWidget;
 
   const SearchAppBar({
     Key? key,
@@ -39,6 +38,7 @@ class SearchAppBar extends StatefulWidget implements PreferredSizeWidget {
     this.onRightBtnCallback,
     this.searchIconColor,
     this.searchIconSize,
+    this.leftWidget,
   }) : super(key: key);
 
   @override
@@ -86,11 +86,12 @@ class _SearchAppBarState extends State<SearchAppBar> {
                 child: Row(
                   children: <Widget>[
                     hGap10,
-                    Icon(
-                      Icons.search,
-                      color: widget.searchIconColor ?? Colors.grey.shade300,
-                      size: widget.searchIconSize,
-                    ),
+                    widget.leftWidget ??
+                        Icon(
+                          Icons.search,
+                          color: widget.searchIconColor ?? Colors.grey.shade300,
+                          size: widget.searchIconSize,
+                        ),
                     hGap5,
                     Expanded(
                       child: TextField(
@@ -122,21 +123,25 @@ class _SearchAppBarState extends State<SearchAppBar> {
                 ),
               ),
             ),
-            InkWell(
-              onTap: () {
-                widget.onRightBtnCallback != null
-                    ? widget.onRightBtnCallback?.call()
-                    : _search();
-              },
-              child: Container(
-                width: 60.0,
-                height: 50.0,
-                alignment: Alignment.center,
-                child: Text(
-                  widget.rightText ?? "搜索",
-                  style: TextStyle(
-                      color: widget.searchTextColor ?? const Color(0xFFFFFFFF),
-                      fontSize: 14.0),
+            Offstage(
+              offstage: widget.rightText.isNullOrEmpty(),
+              child: InkWell(
+                onTap: () {
+                  widget.onRightBtnCallback != null
+                      ? widget.onRightBtnCallback?.call()
+                      : _search();
+                },
+                child: Container(
+                  width: 60.0,
+                  height: 50.0,
+                  alignment: Alignment.center,
+                  child: Text(
+                    widget.rightText ?? "搜索",
+                    style: TextStyle(
+                        color:
+                            widget.searchTextColor ?? const Color(0xFFFFFFFF),
+                        fontSize: 14.0),
+                  ),
                 ),
               ),
             )