searchTextField add placeholder button

example/lib/example_text_field.dart

@@ -18,6 +18,13 @@ class _ExampleTextFiledState extends State<ExampleTextFiled> {
         controller: _controller,
         hintText: '搜索',
       ),
+      body: ListView(
+        children: [
+          ASSearchTextField.button(
+            hintText: '搜索',
+          ),
+        ],
+      ),
     );
   }
 }

lib/text_field/as_search_text_field.dart

@@ -12,7 +12,25 @@ class ASSearchTextField extends StatefulWidget implements PreferredSizeWidget {
     this.focusNode,
     this.onSubmitted,
     this.margin,
-  }) : super(key: key);
+    this.onPressed,
+  })  : button = false,
+        super(key: key);
+
+  ///
+  ASSearchTextField.button({
+    Key key,
+    this.controller,
+    this.hintText,
+    this.onChanged,
+    this.focusNode,
+    this.onSubmitted,
+    this.margin,
+    this.onPressed,
+  })  : button = true,
+        super(key: key);
+
+  ///渲染成按钮
+  final bool button;
 
   ///控制器
   final TextEditingController controller;
@@ -32,6 +50,8 @@ class ASSearchTextField extends StatefulWidget implements PreferredSizeWidget {
   ///margin
   final EdgeInsets margin;
 
+  final VoidCallback onPressed;
+
   @override
   _ASSearchTextFieldState createState() => _ASSearchTextFieldState();
 
@@ -44,11 +64,56 @@ class _ASSearchTextFieldState extends State<ASSearchTextField> {
         borderRadius: BorderRadius.circular(21.w),
         borderSide: BorderSide(
           color: Color(0xFF979797),
+          width: 1.w,
+        ),
+      );
+
+  _buildButton() {
+    return Padding(
+      padding: widget.margin ??
+          EdgeInsets.symmetric(
+            horizontal: 15.w,
+            vertical: 3.w,
+          ),
+      child: MaterialButton(
+        padding: EdgeInsets.zero,
+        color: Color(0xFFF8F8F8),
+        shape: RoundedRectangleBorder(
+          borderRadius: BorderRadius.circular(21.w),
+          side: BorderSide(
+            color: Color(0xFF979797),
+            width: 1.w,
+          ),
+        ),
+        child: Row(
+          children: [
+            Padding(
+              padding: EdgeInsets.only(left: 13.w, right: 8.w),
+              child: Icon(
+                Icons.search,
+                size: 16.w,
+                color: Colors.black,
+              ),
+            ),
+            Expanded(
+              child: Text(
+                widget.hintText ?? '',
+                style: TextStyle(
+                  color: kTextSubColor,
+                  fontSize: 14.sp,
+                ),
+              ),
+            ),
+          ],
+        ),
+        onPressed: widget.onPressed,
       ),
     );
+  }
 
   @override
   Widget build(BuildContext context) {
+    if (widget.button) return _buildButton();
     return Container(
       height: 42.w,
       padding: widget.margin ??
@@ -60,10 +125,13 @@ class _ASSearchTextFieldState extends State<ASSearchTextField> {
         controller: widget.controller,
         onChanged: widget.onChanged,
         onSubmitted: widget.onSubmitted,
+        onTap: widget.onPressed,
         focusNode: widget.focusNode,
         cursorColor: kPrimaryColor,
         textInputAction: TextInputAction.search,
         decoration: InputDecoration(
+          fillColor: Color(0xFFF8F8F8),
+          filled: true,
           hintText: widget.hintText,
           hintStyle: TextStyle(
             color: kTextSubColor,