align_positioned 1.2.5 
align_positioned: ^1.2.5 copied to clipboard
glasberg.devWhen your desired layout or animation is too complex for Columns and Rows, this widget is a life saver. It lets you declaratively position/size its child in complex ways.
import 'package:align_positioned/align_positioned.dart';
import 'package:flutter/material.dart';
import 'package:matrix4_transform/matrix4_transform.dart';
void main() async => runApp(MaterialApp(home: Demo()));
class Demo extends StatelessWidget {
@override
Widget build(BuildContext context) {
//
return Scaffold(
appBar: AppBar(title: const Text('AlignPositioned Example')),
body: Center(
child: SingleChildScrollView(
child: Column(
children: <Widget>[
SizedBox(height: 50, width: double.infinity),
//
Container(
width: 150,
height: 150,
color: Colors.yellow,
child: Stack(children: circlesInside())),
//
SizedBox(height: 50, width: double.infinity),
//
Container(
width: 150,
height: 150,
color: Colors.yellow,
child: Stack(children: circlesOutside())),
//
SizedBox(height: 60),
//
Container(
width: 150,
height: 150,
color: Colors.yellow,
child: Stack(children: circlesWithOffset())),
SizedBox(height: 100),
//
Container(
width: 150,
height: 150,
color: Colors.yellow,
child: Stack(children: circlesWithNamedAlignments())),
//
SizedBox(height: 50),
//
Container(
width: 150,
height: 150,
color: Colors.yellow,
child: Stack(children: circlesWithDWidthAndDHeightInside())),
//
SizedBox(height: 50),
//
Container(
width: 150,
height: 150,
color: Colors.yellow,
child: Stack(children: circlesWithDWidthAndDHeightOutside())),
//
SizedBox(height: 80),
//
Container(
width: 150,
height: 150,
color: Colors.blue,
child: Stack(
children: <Widget>[
AlignPositioned(
touch: Touch.inside,
alignment: Alignment.topLeft,
dx: 15.0,
moveByChildWidth: -0.5,
moveByChildHeight: -0.5,
child: circle(Color(0x50000000), 60.0),
),
AlignPositioned(
touch: Touch.inside,
alignment: Alignment.topLeft,
dx: 15.0,
moveByChildWidth: -0.5,
moveByChildHeight: -0.5,
child: circle(Colors.white, 5.0),
),
AlignPositioned(
rotateDegrees: 180,
touch: Touch.inside,
alignment: Alignment.topLeft,
dx: 15.0,
moveByChildWidth: -0.5,
moveByChildHeight: -0.5,
child: circle(Color(0x50000000), 60.0),
),
AlignPositioned(
rotateDegrees: 180,
touch: Touch.inside,
alignment: Alignment.topLeft,
dx: 15.0,
moveByChildWidth: -0.5,
moveByChildHeight: -0.5,
child: circle(Colors.white, 5.0),
),
],
),
),
//
SizedBox(height: 50),
//
Container(
width: 150,
height: 150,
color: Colors.red,
child: Stack(
children: <Widget>[
AlignPositioned(
touch: Touch.inside,
alignment: Alignment.topLeft,
dx: 15.0,
moveByChildWidth: -0.5,
moveByChildHeight: -0.5,
moveByContainerWidth: 1,
moveByContainerHeight: 1,
child: circle(Color(0x50000000), 60.0),
),
AlignPositioned(
touch: Touch.inside,
alignment: Alignment.topLeft,
dx: 15.0,
moveByChildWidth: -0.5,
moveByChildHeight: -0.5,
moveByContainerWidth: 1,
moveByContainerHeight: 1,
child: circle(Colors.white, 5.0),
),
],
),
),
//
SizedBox(height: 50),
//
Container(
width: 150,
height: 150,
color: Colors.green,
child: Stack(
children: <Widget>[
for (double i = 0; i < 360 * 2; i += 5)
AlignPositioned(
alignment: Alignment.center,
rotateDegrees: i,
touch: Touch.inside,
moveByContainerWidth: 0.5 / 2 / 360 * i,
childWidthRatio: 0.5 / 2 / 360 * i,
childHeightRatio: 0.5 / 2 / 360 * i,
child: circle(Colors.white, 15.0),
)
],
),
),
//
SizedBox(height: 50),
//
Container(
width: 150,
height: 150,
color: Colors.green,
child: Stack(
children: <Widget>[
for (double i = 0; i < 360; i += 45)
AlignPositioned(
alignment: Alignment.center,
rotateDegrees: i,
child: Container(color: Colors.black, width: 60, height: 6),
),
for (double i = 0; i < 360; i += 45)
AlignPositioned(
alignment: Alignment.center,
dx: 50,
dy: 60,
rotateDegrees: i,
child: Container(color: Colors.black, width: 40, height: 8),
),
for (double i = 0; i < 360; i += 5)
AlignPositioned(
alignment: Alignment.bottomLeft,
rotateDegrees: i,
child: Container(
color: Colors.black.withOpacity(i / 360 * .8), width: 100, height: 10),
)
],
),
),
//
SizedBox(height: 120),
//
Container(
width: 150,
height: 150,
color: Colors.purple,
child: Stack(
children: <Widget>[
AlignPositioned(
alignment: Alignment.center,
rotateDegrees: 45,
child: Container(color: Colors.yellow, width: 60, height: 20),
),
AlignPositioned(
alignment: Alignment.center,
matrix4Transform: Matrix4Transform().scale(2),
child: Container(color: Colors.green.withOpacity(0.5), width: 60, height: 20),
),
AlignPositioned(
alignment: Alignment.center,
rotateDegrees: 45,
matrix4Transform: Matrix4Transform().scale(2),
child: Container(color: Colors.red.withOpacity(0.5), width: 60, height: 20),
),
AlignPositioned(
alignment: Alignment.center,
rotateDegrees: 45,
matrix4Transform: Matrix4Transform().scale(2).rotateDegrees(90),
child: Container(color: Colors.blue.withOpacity(0.5), width: 60, height: 20),
),
],
),
),
//
SizedBox(height: 50),
//
Container(
width: 150,
height: 150,
color: Colors.red,
child: AlignPositioned(
alignment: Alignment.center,
childHeightRatio: 0.5,
moveByContainerHeight: 0.25,
childWidth: 75,
wins: Wins.min,
child: Container(color: Color(0x50000000)),
),
),
//
SizedBox(height: 50),
//
Container(
width: 150,
height: 150,
color: Colors.red,
child: AlignPositioned(
alignment: Alignment.center,
childHeightRatio: 0.5,
moveByChildHeight: 0.5,
childWidth: 75,
wins: Wins.min,
child: Container(color: Color(0x50000000)),
),
),
//
SizedBox(height: 50),
//
Container(
width: 150,
height: 150,
color: Colors.red,
child: AlignPositioned(
alignment: Alignment.center,
childHeightRatio: 1.0,
minChildWidthRatio: 0.66,
maxChildWidthRatio: 0.33,
wins: Wins.min,
child: Container(color: Color(0x50000000)),
),
),
//
SizedBox(height: 50),
//
Container(
width: 150,
height: 150,
color: Colors.red,
child: AlignPositioned(
alignment: Alignment.center,
childHeightRatio: 1.0,
minChildWidthRatio: 0.66,
maxChildWidthRatio: 0.33,
wins: Wins.max,
child: Container(color: Color(0x50000000)),
),
),
//
SizedBox(height: 50),
//
Container(
width: 150,
height: 150,
color: Colors.red,
child: AlignPositioned(
alignment: Alignment.center,
childHeightRatio: 1.20,
moveByContainerHeight: 0.10,
childWidth: 190,
wins: Wins.max,
child: Container(color: Color(0x50000000)),
),
),
//
SizedBox(height: 50),
],
),
),
),
);
}
List<Widget> circlesWithDWidthAndDHeightInside() {
var children1 = <Widget>[];
children1.addAll(
circles(Colors.red, Touch.inside, 0, -1, moveByChildWidth: 0.0, moveByChildHeight: 0.0));
children1.addAll(
circles(Colors.blue, Touch.inside, 0, -1, moveByChildWidth: 1.0, moveByChildHeight: 0.0));
children1.addAll(
circles(Colors.green, Touch.inside, 0, -1, moveByChildWidth: -1.0, moveByChildHeight: 0.0));
children1.addAll(
circles(Colors.red, Touch.inside, 1, 0, moveByChildWidth: 0.0, moveByChildHeight: 0.0));
children1.addAll(
circles(Colors.blue, Touch.inside, 1, 0, moveByChildWidth: 0.0, moveByChildHeight: 1.0));
children1.addAll(
circles(Colors.green, Touch.inside, 1, 0, moveByChildWidth: 0.0, moveByChildHeight: -1.0));
children1.addAll(
circles(Colors.red, Touch.inside, 0, 1, moveByChildWidth: 0.0, moveByChildHeight: 0.0));
children1.addAll(
circles(Colors.blue, Touch.inside, 0, 1, moveByChildWidth: 1.0, moveByChildHeight: 0.0));
children1.addAll(
circles(Colors.green, Touch.inside, 0, 1, moveByChildWidth: -1.0, moveByChildHeight: 0.0));
children1.addAll(
circles(Colors.red, Touch.inside, -1, 0, moveByChildWidth: 0.0, moveByChildHeight: 0.0));
children1.addAll(
circles(Colors.blue, Touch.inside, -1, 0, moveByChildWidth: 0.0, moveByChildHeight: 1.0));
children1.addAll(
circles(Colors.green, Touch.inside, -1, 0, moveByChildWidth: 0.0, moveByChildHeight: -1.0));
return children1;
}
List<Widget> circlesWithDWidthAndDHeightOutside() {
var children1 = <Widget>[];
children1.addAll(
circles(Colors.red, Touch.outside, 0, -1, moveByChildWidth: 0.0, moveByChildHeight: 0.0));
children1.addAll(
circles(Colors.blue, Touch.outside, 0, -1, moveByChildWidth: 1.0, moveByChildHeight: 0.0));
children1.addAll(circles(Colors.green, Touch.outside, 0, -1,
moveByChildWidth: -1.0, moveByChildHeight: 0.0));
children1.addAll(
circles(Colors.red, Touch.outside, 1, 0, moveByChildWidth: 0.0, moveByChildHeight: 0.0));
children1.addAll(
circles(Colors.blue, Touch.outside, 1, 0, moveByChildWidth: 0.0, moveByChildHeight: 1.0));
children1.addAll(
circles(Colors.green, Touch.outside, 1, 0, moveByChildWidth: 0.0, moveByChildHeight: -1.0));
children1.addAll(
circles(Colors.red, Touch.outside, 0, 1, moveByChildWidth: 0.0, moveByChildHeight: 0.0));
children1.addAll(
circles(Colors.blue, Touch.outside, 0, 1, moveByChildWidth: 1.0, moveByChildHeight: 0.0));
children1.addAll(
circles(Colors.green, Touch.outside, 0, 1, moveByChildWidth: -1.0, moveByChildHeight: 0.0));
children1.addAll(
circles(Colors.red, Touch.outside, -1, 0, moveByChildWidth: 0.0, moveByChildHeight: 0.0));
children1.addAll(
circles(Colors.blue, Touch.outside, -1, 0, moveByChildWidth: 0.0, moveByChildHeight: 1.0));
children1.addAll(circles(Colors.green, Touch.outside, -1, 0,
moveByChildWidth: 0.0, moveByChildHeight: -1.0));
return children1;
}
List<Widget> circlesInside() {
var children1 = <Widget>[];
children1.addAll(circles(Colors.red, Touch.inside, 0, -1));
children1.addAll(circles(Colors.red, Touch.inside, -1, 0));
children1.addAll(circles(Colors.red, Touch.inside, 0, 1));
children1.addAll(circles(Colors.red, Touch.inside, 1, 0));
children1.addAll(circles(Colors.blue, Touch.inside, -1, -1));
children1.addAll(circles(Colors.blue, Touch.inside, -1, 1));
children1.addAll(circles(Colors.blue, Touch.inside, 1, 1));
children1.addAll(circles(Colors.blue, Touch.inside, 1, -1));
return children1;
}
List<Widget> circlesOutside() {
var children1 = <Widget>[];
children1.addAll(circles(Colors.red, Touch.outside, 0, -1));
children1.addAll(circles(Colors.red, Touch.outside, -1, 0));
children1.addAll(circles(Colors.red, Touch.outside, 0, 1));
children1.addAll(circles(Colors.red, Touch.outside, 1, 0));
children1.addAll(circles(Colors.blue, Touch.outside, -1, -1));
children1.addAll(circles(Colors.blue, Touch.outside, -1, 1));
children1.addAll(circles(Colors.blue, Touch.outside, 1, 1));
children1.addAll(circles(Colors.blue, Touch.outside, 1, -1));
return children1;
}
List<Widget> circlesWithOffset() {
var children2 = <Widget>[];
children2.addAll(circles(Colors.purple, Touch.outside, 0, -1, dx: -15, dy: 15));
children2.addAll(circles(Colors.purple, Touch.outside, -1, 0, dx: -15, dy: 15));
children2.addAll(circles(Colors.purple, Touch.outside, 0, 1, dx: -15, dy: 15));
children2.addAll(circles(Colors.purple, Touch.outside, 1, 0, dx: -15, dy: 15));
children2.addAll(circles(Colors.green, Touch.inside, 0, -1, dx: -15, dy: 15));
children2.addAll(circles(Colors.green, Touch.inside, -1, 0, dx: -15, dy: 15));
children2.addAll(circles(Colors.green, Touch.inside, 0, 1, dx: -15, dy: 15));
children2.addAll(circles(Colors.green, Touch.inside, 1, 0, dx: -15, dy: 15));
return children2;
}
List<Widget> circles(
Color color,
Touch touch,
int dirX,
int dirY, {
double dx,
double dy,
double moveByChildWidth,
double moveByChildHeight,
}) {
return <Widget>[
for (double i = 0.0; i <= 1.0; i += 0.1)
alignPositionedCircle(
i, color, dirX, dirY, touch, dx, dy, moveByChildWidth, moveByChildHeight),
];
}
List<Widget> circlesWithNamedAlignments() {
return <Widget>[
AlignPositioned(
child: circle(Colors.orange), alignment: Alignment.center, touch: Touch.inside),
AlignPositioned(
child: circle(Colors.orange), alignment: Alignment.center, touch: Touch.outside),
//
AlignPositioned(
child: circle(Colors.green), alignment: Alignment.centerRight, touch: Touch.inside),
AlignPositioned(
child: circle(Colors.green), alignment: Alignment.bottomCenter, touch: Touch.inside),
AlignPositioned(
child: circle(Colors.green), alignment: Alignment.centerLeft, touch: Touch.inside),
AlignPositioned(
child: circle(Colors.green), alignment: Alignment.topCenter, touch: Touch.inside),
//
AlignPositioned(
child: circle(Colors.blue), alignment: Alignment.topRight, touch: Touch.inside),
AlignPositioned(
child: circle(Colors.blue), alignment: Alignment.bottomRight, touch: Touch.inside),
AlignPositioned(
child: circle(Colors.blue), alignment: Alignment.topLeft, touch: Touch.inside),
AlignPositioned(
child: circle(Colors.blue), alignment: Alignment.bottomLeft, touch: Touch.inside),
//
AlignPositioned(
child: circle(Colors.red), alignment: Alignment.centerRight, touch: Touch.outside),
AlignPositioned(
child: circle(Colors.red), alignment: Alignment.bottomCenter, touch: Touch.outside),
AlignPositioned(
child: circle(Colors.red), alignment: Alignment.centerLeft, touch: Touch.outside),
AlignPositioned(
child: circle(Colors.red), alignment: Alignment.topCenter, touch: Touch.outside),
//
AlignPositioned(
child: circle(Colors.purple), alignment: Alignment.topRight, touch: Touch.outside),
AlignPositioned(
child: circle(Colors.purple), alignment: Alignment.bottomRight, touch: Touch.outside),
AlignPositioned(
child: circle(Colors.purple), alignment: Alignment.topLeft, touch: Touch.outside),
AlignPositioned(
child: circle(Colors.purple), alignment: Alignment.bottomLeft, touch: Touch.outside),
];
}
AlignPositioned alignPositionedCircle(
double mult,
Color color,
int dirX,
int dirY,
Touch touch,
double dx,
double dy,
double moveByChildWidth,
double moveByChildHeight,
) {
return AlignPositioned(
child: circle(color),
alignment: Alignment(mult * dirX, mult * dirY),
touch: touch,
dx: dx,
dy: dy,
moveByChildWidth: moveByChildWidth,
moveByChildHeight: moveByChildHeight);
}
Container circle(Color color, [double diameter = 30.0]) {
return Container(
width: diameter,
height: diameter,
decoration: BoxDecoration(
border: Border.all(width: 1.0, color: Colors.black),
color: color,
shape: BoxShape.circle,
));
}
}Metadata
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likes
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pub points
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popularity
Publisher
Metadata
When your desired layout or animation is too complex for Columns and Rows, this widget is a life saver. It lets you declaratively position/size its child in complex ways.
Repository (GitHub)
View/report issues
License
unknown (LICENSE)
