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Flutter – Wrap Widget
  • Difficulty Level : Expert
  • Last Updated : 27 May, 2021

Wrap widget aligns the widgets in a horizontal and vertical manner. Generally, we use Rows and Columns to do that but if we have some widgets which are not able to fit in the Row/Column then it will give us Overflow Message ( for ex: Right Overflowed by 570 pixels). 

Constructor of Wrap class:

Wrap({Key key, 
Axis direction, 
WrapAlignment alignment, 
double spacing, 
WrapAlignment runAlignment, 
double runSpacing, 
WrapCrossAlignment crossAxisAlignment, 
TextDirection textDirection, 
VerticalDirection verticalDirection, 
List<Widget> children})

Properties:

  • direction: By default, the axis is horizontal but we can make it vertical by changing the axis from Axis.horizontal to Axis.vertical.
  • alignment: We can set the alignment property to align widgets. (for ex : alignment : WrapAlignment.center).
  • spacing: We can give space between the children.
  • runAlignment: It shows how runs themselves should be placed in the cross axis. By default, we have runAlignment as WrapAlignment.start.
  • runSpacing: We can give runSpacing between the runs. (ex: runSpacing:5.0).
  • crossAxisAlignment: We can align the children relative to each other in cross Axis.
  • textDirection : We can arrange children in a row using textDirection (for ex : textDirection: TextDirection.rtl to arrange from right to left).
  • clipBehaviour: This property takes in Clip enum as the object to decide whether the content inside the Wrap widget will be clipped or not.
  • children: The children property takes in a list of widgets as the object to show inside the Wrap widget or below the Wrap widget in the widget tree.
  • verticalDirection: This property takes in VerticalDirection enum as the object to. This property decides the order in which each children widget will be painted on the screen in a vertical sense.
  • runtimeType: Type class is the object given to the runtimeType property. It determines the type of the Wrap widget at the run time.
  • key: This property decides how one widget will replace another widget on the screen.
  • haskCode: This property takes in an int value as the object which represents the state of the widget.

Implementation with Example:

main.dart

Dart




import 'package:flutter/material.dart';
void main() => runApp(MyApp());
 
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: "GFG",
      theme: new ThemeData(
          primarySwatch: Colors.green
      ),
      debugShowCheckedModeBanner: false,
      home: WrapW()
    );
  }
}
 
class WrapW extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar:AppBar(
        title: Text("GeeksForGeeks"),
      ),
      body: Wrap(
        // direction: Axis.vertical,
        // alignment: WrapAlignment.center,
        // spacing:8.0,
        // runAlignment:WrapAlignment.center,
        // runSpacing: 8.0,
        // crossAxisAlignment: WrapCrossAlignment.center,
        // textDirection: TextDirection.rtl,
        // verticalDirection: VerticalDirection.up,
        children: <Widget>[
          Container(
            color: Colors.blue,
            width: 100,
            height: 100,
            child:Center(child: Text("W1",textScaleFactor: 2.5,))
          ),
          Container(
            color: Colors.red,
            width: 100,
            height: 100,
            child:Center(child: Text("W2",textScaleFactor: 2.5,))
          ),
          Container(
            color: Colors.teal,
            width: 100,
            height: 100,
            child:Center(child: Text("W3",textScaleFactor: 2.5,))
          ),
          Container(
            color: Colors.indigo,
            width: 100,
            height: 100,
            child:Center(child: Text("W4",textScaleFactor: 2.5,))
          ),
          Container(
            color: Colors.orange,
            width: 100,
            height: 100,
            child:Center(child: Text("W5",textScaleFactor: 2.5,))
          ),
        ],
      ),
    );
  }
}

Explanation:

direction: Axis.horizontal // default

Output: 

wrap wiggets

direction: Axis.vertical

Output: 

wrap wiggets



alignment: WrapAlignment.center

Output: 

wrap wiggets

alignment: WrapAlignment.center,
spacing:8.0,

Output: 

wrap wiggets

alignment: WrapAlignment.center,
spacing:8.0,
runSpacing: 8.0,

Output: 

wrap wiggets

spacing:8.0,
runSpacing: 8.0,
textDirection: TextDirection.rtl,

Output:

wrap wiggets

spacing:8.0,
runSpacing: 8.0,
verticalDirection: VerticalDirection.up,

Output:

wrap wiggets




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