Flutter: boxdecoration hide icon button's ripple , does the rendering order right?

[cjztool]

Steps to Reproduce

Follow the page https://codelabs.developers.google.com/codelabs/flutter/index.html#5

my code is :

```
Widget _setupBody() {
return new Column(
children: [
new Expanded(
child: new ListView.builder(
itemBuilder: (_nothing, int index) => _messageList[index],
reverse: true,
itemCount: _messageList.length,
),
),
new Divider(height: 1.0),
new Container(
padding: const EdgeInsets.symmetric(horizontal: 5.0),
//decoration: new BoxDecoration(color: Theme.of(context).cardColor,),
child: new Row(
children: [
new Flexible(
child: new TextField(
maxLines: 1,
controller: _myController,
onSubmitted: _handleSubmitt,
decoration: new InputDecoration.collapsed(hintText: "input here"),
),
),
new IconTheme(
data: new IconThemeData(color: Theme.of(context).accentColor),
child: new IconButton(icon: new Icon(Icons.send), onPressed: () => _handleSubmitt(_myController.text)))
],
))
],
);
}

then it shown like this: 
![screenflow](https://user-images.githubusercontent.com/3993323/31986228-425b9d68-b92d-11e7-8176-de3deab993c2.gif)

after add the decoration  (uncomment the line 14)

![screenflow2](https://user-images.githubusercontent.com/3993323/31986425-0dcfe8b4-b92e-11e7-90ae-52664835cd4b.gif)

as you see, the boxdecoration hide the ripple.

from the code , i think , the boxdexcoration should be rendered first. 

How to change the code makes the ripple at front of the boxdexcoration?



## Flutter Doctor

[✓] Flutter (on Mac OS X 10.12.4 16E195, locale zh-Hans-CN, channel alpha)
• Flutter at /Users/cjz/ALL_IN_THIS/flutter
• Framework revision e8aa40eddd (7 days ago), 2017-10-17 15:42:40 -0700
• Engine revision 7c4142808c
• Tools Dart version 1.25.0-dev.11.0

[✓] Android toolchain - develop for Android devices (Android SDK 26.0.2)
• Android SDK at /Users/cjz/ALL_IN_THIS/Android/sdk
• Platform android-26, build-tools 26.0.2
• ANDROID_HOME = /Users/cjz/ALL_IN_THIS/Android/sdk
• Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 1.8.0_152-release-915-b08)

[✓] iOS toolchain - develop for iOS devices (Xcode 8.3.2)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 8.3.2, Build version 8E2002
• ios-deploy 1.9.2
• CocoaPods version 1.3.1

[✓] Android Studio (version 3.0)
• Android Studio at /Applications/Android Studio.app/Contents
• Java version OpenJDK Runtime Environment (build 1.8.0_152-release-915-b08)

[✓] Connected devices
• Android SDK built for x86 • emulator-5554 • android-x86 • Android 5.1.1 (API 22) (emulator)
• iPhone SE • 795AA980-157D-455C-AC52-385CBDDC3BDE • ios • iOS 10.3 (simulator)
```

[mchome]

hey @cjztool, you can wrap it into a Material class instead of using Container class if you just want to color it.

[cjztool]

I am a newbie, thank you so much! Nice Work! @mchome

Widget _setupBody() {
    return new Column(
      children: <Widget>[
        new Expanded(
          child: new ListView.builder(
            itemBuilder: (_nothing, int index) => _messageList[index],
            reverse: true,
            itemCount: _messageList.length,
          ),
        ),
        new Divider(height: 1.0),
        new Material(
          color: Theme.of(context).cardColor,
          //child: new Container(
          //  padding: const EdgeInsets.symmetric(horizontal: 5.0),
            child: new Row(
              children: <Widget>[
                new Flexible(
                  child: new TextField(
                    maxLines: 1,
                    controller: _myController,
                    onSubmitted: _handleSubmitt,
                    onChanged: (String text) {
                      setState(() {
                        _isComposing = text.length > 0;
                      });
                    },
                    decoration: new InputDecoration.collapsed(hintText: "input here"),
                  ),
                ),
                new IconTheme(
                    data: new IconThemeData(color: Theme.of(context).accentColor),
                    child: Theme.of(context).platform == TargetPlatform.iOS
                        ? new CupertinoButton(child: new Text("Send"), onPressed: _isComposing ? () => _handleSubmitt(_myController.text) : null)
                        : new IconButton(icon: new Icon(Icons.send), onPressed: _isComposing ? () => _handleSubmitt(_myController.text) : null))
              ],
            ),
         //   decoration: new BoxDecoration(
         //     color: Theme.of(context).cardColor,
         //   ),
         // ),
        ),
      ],
    );
  }

[cjztool]

@mchome 厉害了 哈哈! 才发现你主页用的汉字..