Skip to main content

How to use container widget

In this lesson ,I talk to you about one of the most basic of concept of flutter

Use all the time to design our applications.

 This is a container widget.




Now a container widget for those who have done a bit of web development or web design.

It's like a div.


This is a Layout Box.


You can move it by placing it on the screen and then you give a child to  show images,text and some other propertis .My top tip ,whenever, you use new widget in flutter it start from documentation. 

As I said you above,  the documentation was really good and  all  you have to do  to find it.

We are going to Widget Catalogue then you will find it for                                         Flutter development 

 you can see that the team has sorted all the widgets based on their actions.

And we've really seen some of those images and assets

Layout section and other widgets that allow you to create other widgets to hold things.

Under widget design.

You can see that they are divided into single child widget and multi child widget, a widget that can contain

A widget includes a piece of text or an icon or many different widgets, such as five images or a single image and a piece of text.

In this module, we are going to look for a child and multi-channel things to learn.

How to design your screen the way you want it to look.

The most commonly used child widget is a container.

Your can see  a  container class  below and it's the widget that lets us get into position.




Container class

A combines common painting ,positioning ,and sizing widgets.

And one thing it does tell you is that childless containers should try to be as large as possible

And that's what we're seeing here.We have a container that is currently trying to get as big as possible.

import 'package:flutter/material.dart';



void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        backgroundColor: Colors.white,
        body: Container(),
      ),
    );
  }
}


How do we know

Well, we give it a color teal.

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());


}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        backgroundColor: Colors.teal,
        body: Container(),
      ),
    );
  }
}

Let's see for ourselves

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
void main() {
  runApp(MyApp());
}
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        backgroundColor: Colors.teal,
        body: Container(
          color: Colors.white,
        ),
      ),
    );
  }
}
                                So let's go ahead and turn it into a tail and will have an immediate background using the hot load.And now inside the container.So inside these letters, I'll insert and change the color and we have to specify a color for our container.
                                                
                     Let's whitewash container.So when I come back to save and warm up, you can see that my whole screen turns white though.We know the background color is still teal. And the reason is that our container is occupying the available space.


import 'package:flutter/cupertino.dart;


import 'package:flutter/material.dart';
void main() {
 runApp(MyApp());
}

class MyApp extends StatelessWidget {
@override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        backgroundColor: Colors.teal,
        body: Container(
          color: Colors.white,
          child: Text("Hello"),
        ),
      ),
    );
  }
}

                                               As stated here.Container without children.Try to be as big as possible, there is currently nothing in the children's property in our container.So try to be as big as possible.But what if we gave him a child?

                                                         What if we give it a secondary widget?This is a phrase that says hello.Let's press and immediately our our container is reduced to the size of a secondary widget and we can have .Get to know your children by reading the documentary container about it Size and in this case our child is a piece of text and its size is determined by its font size.

                                                     That piece of text.Now at this point, you can see that all the text is slightly hidden from our text Depending on the screen of the iPhone and Android, depending on the device you're copying.

                                                      Mark like this So the way we put our content on the screen, how do we protect it from all these border elements The top bar where we have our time and our signal and our input floating really comes with a Simple widget that does just that.This is called a safe area and everything you put in a safe area will be in those areas

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget 
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        backgroundColor: Colors.teal,
        body: SafeArea(
          child: Container(
            color: Colors.white,
            child: Text("Hello"),
          ),
        ),
      ),
    );
  }
}
                                           



                                                   

There is no sign or hotspot like this part on the iPhone.

                                                  To embed our container in a safe area, we can hold the        option or reverse and press Enter to drag.Add the steps of our intention here to our     small  menu and I'm going to wrap up my container which is at the moment Inside                 new widget is selected and all this is to put our old container in a new widget

And defines it as the child of this widget.So now we can change this widget and I would call it a safe area with Capital S and A above TO

Now as soon as I hit the safe, you will see that my container has gone back.

When you create a user interface that you don't want to bleed all the way

Edges but instead you want to see it from the front of the user.

You use your safe area.

Edge but instead of what you see as complete to the user

Then you are about to use your Save Area.

What else can you do with your container?

Width and Height.

Well we can change its size as well as its width and height.

So if we just go ahead and add a new property called height and let's fix it at one hundred pixels

One hundred points and let's change the width to a hundred.

So now we should have 100 to 100 square containers as soon as I hit the safe.

import 'package:flutter/cupertino.dart';


import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        backgroundColor: Colors.teal,
        body: SafeArea(
          child: Container(
            color: Colors.white,
            height: 100,
            width: 100,
            child: Text("Hello"),
          ),
        ),
      ),
    );
  }
}

And you go there.

We have our square container with a lonely child who is a piece of text that says hello now

If I want my container to be a little offset from the edges of the screen.

Margin

What if I want to set a margin for my container?

OK I can use margin property and to define margin property we have to use something called Edge inserts.

And you can see that there are different types of edge insertions that you can all user This means that whatever you enter here is said to be set to 20 pixels on all four sides.

import 'package:flutter/cupertino.dart';


import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        backgroundColor: Colors.teal,
        body: SafeArea(
          child: Container(
            color: Colors.white,
            height: 100,
            width: 100,
            margin: EdgeInsets.all(20),
            child: Text("Hello"),
                                       
),                                                
        ),
      ),
    );
  }
}

Your container

So left to right and down to now a little distance of 20.

What if we didn't want that?

What if we just want to keep it up and down?

Well then you can use balance

So now you could say I want 50 for vertical axes but only for horizontal axes.Want to keep 10 for margin.So now if we hit the savings, you can see that it's offset from the top 50 and left and right.


Only 10

And you can always easily see it by going to the Flattery Inspector and clicking on this button here.

And now you can see that the top and bottom of our container are 50 and left and right

Being 10 and you can also see the safe space that is now here instead of syncing with this box

Where you provide the same value for the upper bottom and the same value for the left and right that you can also provide

Give it different values ​​on each side so you can tell LTE RB either way.

So it's from left to top right and bottom left.

Suppose it's 30 top 10.

Okay fine

50 down 20 on each side.

I have given a different margin and now that I have hit the savings you can see how our box changes.

You can see that left 30 is above 10, right is 50 and bottom is 20.

So this box is what our margins are doing on our screen but if you don't want four values

Clearly you can just use that to say just set a margin to the left which is 30 and now everything

Otherwise one zero is left and only the left gets this margin.

So there are various ways that you can do this now.

If you want the baby in the container to be a little more offset from its edge

Container

In this case you do not use margins and you will use a recruitment instead.

So if you've ever worked with CFS or web design then it will all feel very intuitive to you.

And keep in mind that the fluttering team actually comes from a web development background.

This is one of the reasons why doing this job can be so familiar and so intuitive. So for recruitment, it also expects an edge.

So let's go ahead and provide one.

 Padding

And it allows us to determine fundamentally different values ​​for the padding for the four edges of anything.

That is, we are compiling it, which is our container in this case

Let's add a recruitment for all sides.

That's 20.

import 'package:flutter/cupertino.dart';


import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        backgroundColor: Colors.teal,
        body: SafeArea(
          child: Container(
            color: Colors.white,
            height: 100,
            width: 100,
            margin: EdgeInsets.all(20),
            padding: EdgeInsets.all(20),
            child: Text("Hello"),
          ),
        ),
      ),
    );
  }
}

And when I hit the savings you will see that I now have a small box inside my container that is restricting it.

The child is still in the area.

And if I go ahead and remove all these guidelines, you can see that that's what I ended up with.

I have a container that has been slightly removed from the edges of the screen and I have found its contents

Pushed away from the edges of the container.

So the margin is for the exterior of your widget and the recruitment inside your widget.

And remember that there can only be one child in the container.

Okay fine

So for example I can't have a piece of text and maybe say a picture that won't work because remember

You can only have one widget child

So we're just laying a baby in the next lesson for which we'll consider some methods

Laying multiple children using widgets like columns and rows.

So all this and I will see in the next lessons.


Comments

Post a Comment

Popular posts from this blog

Data Types in Java

  Data Types in Java  Data type:    Data type indicates the different sizes and various values that can be stored in the variable.  Types of data types in Java  1.Primitive data types  2.Non-primitive data types    Java Primitive Data Types  There are 8 types of primitive data types are as follows:  ★ boolean data type  ★ byte data type  ★ short data type  ★ char data type  ★ int data type  ★ long data type  ★ float data type  ★ double data type    Java Non-Primitive Data Types  Non primitive data types are:  ★Struct  ★Array  ★Class Program example to understand the datatypes in java   class Datatype {  public static void main(String[] args) {  int a=23;  float b=34.5f;  long c=90l;  byte d=78;  double e=78.8;  char f='A';  short x=56;  System.out.println("Primitive Data Types:");  System.out.println("The value of ...
1 comment
Read more

Java Nested For Loop

  A for loop with another for loop is called nested for loop. Syntax: for(initialization;condition;increment/decrement){ for(initialization;condition;increment/decrement;){ }//inner for loop }//outer for loop  Example: public class nestedForloop{   public static void main(String[] args) {                         for ( int y= 1 ;y<= 3 ;y++){   for ( int x= 1 ;x<= 5 ;x++){    System.out.println(y+ " " +x);   }//inner loop  } //outer loop  System.out.print(“Nested For loop”); }  Pyramid *  * *  * * *  * * * *  * * * * * public class Pyramid { public static void main(String[] args) { for(int i=1;i<=5;i++){ for(int j=1;j<=i;j++){ System.out.print("* "); } System.out.println() } } } * * * * * *  * * * * *  * * * *  * * *  * *...
Post a Comment
Read more

Intorducation of data sturcture

Let’s start to introduction of data structure Data is an integral part of an application or program .It defines a program ,so program is nothing ,Set of instructions to perform on data to get some output.Then without data there are no instructions enough . no use of instructions , The term of data we use many palace like  Data sturcture  DataBases  Data Warehouse  Big Data  Let's start by introducing the data structure. Data Structure Data structure is the arrangement and collocation of data items . so that can be utilized and perform operations on data efficiently.Its all about arrangement and  efficient operation on data. That question is where inside the main memory during execution of the program.   So,without data structure there is no application.  Every Application will have a set of instructions to perform on data.So that data is mondetry ,where it will capture the data inside main memory. So, during the program execution how will the...
Post a Comment
Read more