demo1.dart

import 'package:flutter/material.dart';

List<String> namen = ["Frida Müller","Helene Kowaschek","Trude Mustgard"];


class _MeinInherited extends InheritedWidget{
  _MeinInherited({
    Key key,
    @required Widget child,
    @required this.data,
  }):super(key:key,child:child);

  final MeinInheritedWidgetState data; // hier befinden sich unsere Daten, dynamische Daten

  @override

  bool updateShouldNotify(_MeinInherited oldWidget){ //eine eingebaute Methode, die überprüft ob sich am "State" etwas geändert hat
    return true;
  }
}
class MeinInheritedWidget extends StatefulWidget{
  MeinInheritedWidget({
    Key key,
    this.child,
  }):super(key:key);

  final Widget child;

  @override

  MeinInheritedWidgetState createState() => new MeinInheritedWidgetState();

  static MeinInheritedWidgetState of(BuildContext context){
    return (context.inheritFromWidgetOfExactType(_MeinInherited) as _MeinInherited).data;
  }
}
class MeinInheritedWidgetState extends State<MeinInheritedWidget>{ //hier passiert alles spannende

bool gedruckt=true;
int zaehler=0;
int zaehler1=0;
dynamic deco=boxDeco;
int buttonnr=0;

int get aufzahlen{
  if(zaehler>=2){zaehler=-1;}
  zaehler = zaehler+1;
  return zaehler;
}
int get aufzahlen1{
  if(zaehler1>=2){zaehler1=-1;}
  zaehler1 = zaehler1+1;
  return zaehler;
}

void toggleGedruckt(bool gedruckt){
  setState(() {
   if (gedruckt) {
     deco = boxDeco1;
     gedruckt=false;
     print(gedruckt);
   } else {
     deco = boxDeco;
     gedruckt=true;
     print(gedruckt);
   }
  });
}

@override
Widget build(BuildContext context){
return new _MeinInherited(
  data: this,
  child: widget.child,
);
}
}
void main()=>runApp(MeinProg());
class MeinProg extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: MeinAppBaum(),
    );
  }
}

class MeinAppBaum extends StatefulWidget {
  @override
  _MeinAppBaumState createState() => _MeinAppBaumState();
}

class _MeinAppBaumState extends State<MeinAppBaum> {
  @override
  Widget build(BuildContext context) {
    return new MeinInheritedWidget(
      child: new Scaffold(
        appBar: new AppBar(
          title:new Text(
            "Phone Book"
          ),
        ),
        body: new Column(
        children: <Widget>[
          abStand,
          Row(
            crossAxisAlignment: CrossAxisAlignment.center,
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              abStand,
              MeinButton1(),
              PbookEintrag1(),
            ],
          ),
          Row(
            crossAxisAlignment: CrossAxisAlignment.center,
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              abStand,
              MeinButton2(),
              PbookEintrag2(),
            ],
          )
        ], 
        ),
      ),
      
    );
  }
}
dynamic boxDeco = BoxDecoration(
              border: Border.all(
                color:Colors.black,
                width: 2.0,
                style: BorderStyle.none,
              ),
              color: Colors.grey[50],
              borderRadius: BorderRadius.all(
                Radius.circular(
                  10.0
                )
              ),
              boxShadow: [BoxShadow(
                color: Colors.grey,
                offset: Offset(3.0, 3.0),
                blurRadius: 5.0,
              )],
            );
dynamic boxDeco1 = BoxDecoration(
              border: Border.all(
                color:Colors.black,
                width: 2.0,
                style: BorderStyle.none,
              ),
              color: Colors.grey[50],
              borderRadius: BorderRadius.all(
                Radius.circular(
                  10.0
                )
              ),
              boxShadow: [BoxShadow(
                color: Colors.grey,
                offset: Offset(1.0, 1.0),
                blurRadius: 1.0,
              )],
            );
            
Widget abStand = new SizedBox(width: 24.0,height: 48.0,);
Widget abStandb = new SizedBox(width: 48.0,height: 24.0,);

class MeinButton1 extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final MeinInheritedWidgetState state = MeinInheritedWidget.of(context);
    return Container(
      decoration:state.deco,
      child: IconButton(
        iconSize: 32,
        splashColor: Colors.blue[50],
        icon: Icon(
          Icons.person,
        ),
        onPressed: () {
          state.toggleGedruckt(state.gedruckt);
          state.aufzahlen;
          state.buttonnr=1;
        },
      ),
    );
  }
}
class MeinButton2 extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final MeinInheritedWidgetState state = MeinInheritedWidget.of(context);
    return Container(
      decoration:state.deco,
      child: IconButton(
        iconSize: 32,
        splashColor: Colors.blue[50],
        icon: Icon(
          Icons.person,
        ),
        onPressed: () {
          state.toggleGedruckt(state.gedruckt);
          state.aufzahlen1;
          state.buttonnr=2;
        },
      ),
    );
  }
}

class PbookEintrag1 extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final MeinInheritedWidgetState state = MeinInheritedWidget.of(context);
    return Container(
      margin: EdgeInsets.all(5.0),
  alignment: Alignment.centerLeft,
  constraints: BoxConstraints.expand(
    width: 300.0,
    height: 48.0,
  ),
  decoration: state.deco,
  child:Text(
  "${namen[state.zaehler]}",
  style: TextStyle(
    fontSize: 24.0,
   ),
  ),
    );
  }
}
class PbookEintrag2 extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final MeinInheritedWidgetState state = MeinInheritedWidget.of(context);
    return Container(
      margin: EdgeInsets.all(5.0),
  alignment: Alignment.centerLeft,
  constraints: BoxConstraints.expand(
    width: 300.0,
    height: 48.0,
  ),
  decoration: state.deco,
  child:Text(
  "${namen[state.zaehler1]}",
  style: TextStyle(
    fontSize: 24.0,
   ),
  ),
    );
  }
}
class PbookEintrag3 extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final MeinInheritedWidgetState state = MeinInheritedWidget.of(context);
    return Container(
      margin: EdgeInsets.all(5.0),
  alignment: Alignment.centerLeft,
  constraints: BoxConstraints.expand(
    width: 300.0,
    height: 48.0,
  ),
  decoration: state.deco,
  child:Text(
  "${namen[state.zaehler]}",
  style: TextStyle(
    fontSize: 24.0,
   ),
  ),
    );
  }
}