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@alfaben12
Forked from kumar-aakash86/main.dart
Created September 10, 2020 04:18
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Single Finger Widget Resize
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
debugShowCheckedModeBanner: false,
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
MBWidget _mbWidget = MBWidget(100, 100);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Container(
width: 300,
color: Colors.amber,
child: Stack(
children: <Widget>[
Positioned(
top: 0,
left: 0,
child: Text('width = ${_mbWidget.width} | height = ${_mbWidget.height}'),
),
_getDraggable(context),
],
),
),
);
}
_getDraggable(context) {
return Positioned(
top: 100,
left: 0,
child: GestureDetector(
// key: widget.testTextKey ?? UniqueKey(),
onTap: () {},
child: Stack(
children: <Widget>[
Draggable(
child: _getChild(),
maxSimultaneousDrags: 1,
childWhenDragging:
Material(child: null // _child(draggableKeys[1]),
),
feedback: Material(
child: _getChild(),
color: Colors.transparent,
),
),
Positioned(
child: GestureDetector(
onScaleStart: _resizeStart,
onScaleEnd: _resizeEnd,
onScaleUpdate: _resizing,
child: Container(
child: new Icon(
Icons.aspect_ratio,
color: Colors.white,
size: 15.0,
),
decoration: BoxDecoration(
shape: BoxShape.circle,
color: Theme.of(context).primaryColor),
padding: const EdgeInsets.all(5.0),
),
),
bottom: 0,
right: 0,
),
],
),
),
);
}
_getChild() {
return Container(
margin: const EdgeInsets.only(
right: 10,
bottom: 10,
),
padding: const EdgeInsets.all(5.0),
child: Image.network(
"https://picsum.photos/id/1/300/300",
width: _mbWidget.width,
height: _mbWidget.height,
fit: BoxFit.cover,
),
decoration: BoxDecoration(
color: Colors.transparent,
border: Border.all(
width: 2.0, color: Colors.black, style: BorderStyle.solid),
),
);
}
bool isResizing = false;
Offset initialOffset;
_resizeStart(ScaleStartDetails details) {
// print('resize start ${details}');
isResizing = true;
initialOffset = details.focalPoint;
// initialOffset = details.focalPoint;
// print('initial ${details.focalPoint}');
// print('local ${details.localFocalPoint}');
}
_resizeEnd(ScaleEndDetails details) {
// print('resize end ${details}');
isResizing = false;
}
double width = 0, height = 0;
// NOT COMPLETED YET
_resizing(ScaleUpdateDetails details) {
if (isResizing) {
// width = details.focalPoint.dx - initialOffset.dx;
// height = details.focalPoint.dy - initialOffset.dy;
width = details.focalPoint.dx - initialOffset.dx - width;
height = details.focalPoint.dy - initialOffset.dy - height;
var widthDiff = details.focalPoint.dx / initialOffset.dx;
var heightDiff = details.focalPoint.dy / initialOffset.dy;
_mbWidget.setWidth(_mbWidget.width * widthDiff);
_mbWidget.setHeight(_mbWidget.height * heightDiff);
// print('${details.focalPoint.dx} - ${details.focalPoint.dy} == ${initialOffset.dx} - ${initialOffset.dy}');
// print('width $width / height $height == widthDiff $widthDiff / heightDiff $heightDiff');
// print('width $width / height $height == widget ${_mbWidget.width} / ${_mbWidget.height}');
initialOffset = details.focalPoint;
setState(() {
});
}
}
}
class MBWidget {
double width = 100;
double height = 100;
MBWidget(this.width, this.height);
setWidth(double w) => this.width = w;
setHeight(double h) => this.height = h;
}
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