Flutter动态创建UI实现方案

Simulator Screen Shot – iPhone 12 – 2020-12-17 at 09.22.41.png

Widgets

目前我们支持如下Widget。

Container
Text
TextField
Column
Expanded
Image
Padding
Row
SafeArea
SingleChildScrollView
Scaffold
AppBar
RawMaterialButton
SizedBox
Dialog

Customize-Widget

当引擎提供的组件不满足使用需求时，可以通过扩展组件的方式添加自定义的组件。自定义组件的方式如下，或者参考 Container：

Define CustomerWidget

/// CustomerWidget handler
class YZCustomerWidgetHandler extends YZDynamicBasicWidgetHandler {

  @override
  String get widgetName => 'CustomerWidget';

  @override
  Widget build(Map<String, dynamic> json, {Key key, BuildContext buildContext}) {
    return _Builder(json, key:key);
  }
  
}

class _Builder extends YZDynamicBaseWidget {

  final Map<String, dynamic> json;

  _Builder(this.json, {Key key}): super(json, key: key);

  @override
  _BuilderState createState() => _BuilderState();
}

class _BuilderState extends YZDynamicWidgetBasicState<_Builder> {

  //Deal with props / 处理控件属性
  Map props;
  Alignment _alignment;

  @override
  void initState() {
    super.initState();

    //Deal with props / 处理控件属性
    props = super.config.props;
    _alignment = YZDinamicWidgetUtils.alignmentAdapter(props["alignment"]);   
  }

  @override
  Widget build(BuildContext context) {
    Widget _widget;

    CustomerWidget _subwidget = CustomerWidget(
      alignment: _alignment,
    );  

    //Deal with events / 处理事件
    _widget = super.buildWithEvents(_subwidget, super.config.xEvents);

    return _widget;
  }

  @override
  void registerActions() {
    //Deal with action / 处理事件实现
    actionFunctions['setState'] = stateSetter; 
  }

  void stateSetter({
      Map params, 
      YZDynamicRequest request,
      List<YZDynamicActionRule> rules,
      Map localVariables,
      State state,
    }) {
    print('Execute xAction: ${this.runtimeType} setState');
    if (mounted) {
      setState(() {});
    }
  }

}

Register CustomerWidget

YZDynamicCommon.reginsterWidgetHandler(YZCustomerWidgetHandler)

User CustomerWidget

{
  "xKey": "globalKeyOfWidget", 
  "widgetName": "CustomerWidget",      
  "props": { 
     "alignment": "[10, 10, 0, 0]"
  },
  "xEvents": [
  {
    "eventType": "onClick",
    "code": '''
      [code...]      
    '''
  },
  "xVar": {
  
  }
  ]           
}

Customize-Grammar

当引擎提供的伪代码语法不满足使用需求时，可以通过扩展action的方式添加自定义的语法。

Define action

/*
 * Custum action
 * 自定义 action 
 */
class YZToastHandler extends YZDynamicPublicActionHandler{
  @override
  void action(BuildContext context, {
      Map params, 
      YZDynamicRequest request,
      List<YZDynamicActionRule> rules,
      Map localVariables,
      State state,
    }) {
      String tip = params['tip'];
      Fluttertoast.showToast(
        msg: tip,
        toastLength: Toast.LENGTH_SHORT,
        gravity: ToastGravity.CENTER,
        timeInSecForIosWeb: 1,
        backgroundColor: Colors.red,
        textColor: Colors.white,
        fontSize: 16.0
    );
  }

  @override
  String get actionName => 'yzToast';

}

Register action

YZDynamicCommon.reginsterPublicActionHandler(YZToastHandler());

User action

yzToast(tip:content);

Contact

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