Flutter Container reduced it width when I added a child property .Why?-CodePudding

I wanted to make a carousel with some images along with some texts.So I put the images inside a container .But when I added a Text widget as the child of the container, the container shrinks to minimum width . Why ?

CarouselSlider(
              items: [
                //1st Image of Slider

                Container(
                  child: Text("Diverse stories you'll love"),
                  margin: EdgeInsets.all(6.0),
                  decoration: BoxDecoration(
                    borderRadius: BorderRadius.circular(8.0),
                    image: DecorationImage(
                      image: AssetImage("images/welcomepage1.jpg"),
                      fit: BoxFit.cover,
                    ),
                  ),
                ),

                //2nd Image of Slider
                Container(
                  child: Text("Make friends and share your voice"),
                  margin: EdgeInsets.all(6.0),
                  decoration: BoxDecoration(
                    borderRadius: BorderRadius.circular(8.0),
                    image: DecorationImage(
                      image: AssetImage("images/welcomepage2.jpg"),
                      fit: BoxFit.cover,
                    ),
                  ),
                ),

              
              ],

              //Slider Container properties
              options: CarouselOptions(
                height: 300.0,
                enlargeCenterPage: true,
                autoPlay: true,
                aspectRatio: 16 / 9,
                autoPlayCurve: Curves.fastOutSlowIn,
                enableInfiniteScroll: true,
                autoPlayAnimationDuration: Duration(milliseconds: 800),
                viewportFraction: 0.8,
              ),
            ),

CodePudding user response：

Containers with no children try to be as big as possible unless the incoming constraints are unbounded, in which case they try to be as small as possible. Containers with children size themselves to their children. The width, height, and constraints arguments to the constructor override this.

From the Flutter documentation.

CodePudding user response：

It is possible that the child widget you added to the Container widget is causing the Container to shrink in width. This can happen if the child widget has a fixed width or if it is set to take up a certain amount of the available space using a layout behavior such as Expanded.

You can try setting the width property of the Container to a specific value or using a layout widget such as Flex or Row to control the size and layout of the Container and its child widgets.

Here is an example of using the Flex widget to layout a Container and a child widget:

Flex(
  direction: Axis.horizontal,
  children: [
    Container(
    width: 200,
    height: 100,
    color: Colors.red,
   ),
   Container(
   width: 100,
   height: 100,
   color: Colors.green,
    ),
  ],
),

This will create a horizontal layout with two Container widgets, the first with a width of 200 and the second with a width of 100. The Flex widget will take up all available space in the parent widget, and the Container widgets will be sized according to their specified widths.

You can also use the Expanded widget to distribute remaining space among the children of a Row or Column layout:

Row(
 children: [
   Expanded(
    child: Container(
      height: 100,
      color: Colors.red,
   ),
  ),
 Container(
  width: 100,
  height: 100,
  color: Colors.green,
  ),
 ],
),

This will create a horizontal layout with two Container widgets, the first taking up all remaining space and the second with a fixed width of 100.