the variable which the state inside StateFulBuilder is dependant on should be defined outside the builder method of StateFulBuilder. If it is defined inside, It will not have any affect.
A container should have either its color specified or its decoration specified. They cannot be mixed up. If you want to use both of them, the trick is to define the color inside BoxDecoration and pass it through the decoration field of your Container.
Watch out for this huge mistake. When you want to construct a map as body, do not use the key and value with the same property. Dart will not throw an error because key of the map can be dynamic so as the value.
here is an example of the mistake.
var code = "string";
{ code: code }
this is a valid Map object in dart, but not for us.
The correct syntax would be,
{ "code": code }
null.toString() can be called and no error happens, the result will be "null". watch out.
Functions inside SetState have to be synchronous so don't put await inside SetState.
A single instance of ScrollController cannot be attached to multiple widgets.
It is wrong to use this inside such type of project since it does not render inside GetX's widget tree. Anyway, it is silly to mix state management methods up.