Flutter design tool

In Flutter, LayoutBuilder Widget is similar to the Builder widget except that the framework calls the builder function at layout time and provides the parent widget’s constraints. This is useful when the parent constrains the child’s size and doesn’t depend on the child’s intrinsic size .

Since the core concept of Flutter is Everything is widget, Flutter incorporates a user interface layout functionality into the widgets itself . Flutter provides quite a lot of specially designed widgets like Container, Center, Align, etc., only for the purpose of laying out the user interface.

To debug a layout issue, run the app in debug mode and open the inspector by clicking the Flutter Inspector tab on the DevTools toolbar . Note: You can still access the Flutter inspector directly from Android Studio/IntelliJ, but you might prefer the more spacious view when running it from DevTools in a browser.

MainAxisAlignment is a property of Column widget . It is used to arrange children widgets into vertically format according to given axis. Today we would use the Column widget and make children widget into single column format in flutter.