/Workshop-Money-Exchange

Primary LanguageDart

Money Exchange

We created an app which converts the inserted sum of "lei" to "euros" or "dollars" by pressing the corresponding button.

New widgets

  • AppBar
  • Image
  • Expanded
  • TextField, InputDecoration
  • ElevatedButton

What / how we did

  • change a textfield:

    • use the onChanged property
    • use a TextEditingController variable

  • change "lei" to multiple currencies

    • create a function which takes the currency as a parameter
    • use a map<currency, factor> to do the same computation for as many existing currencies

  • display an error message when the input isn't valid

    • set the errorText variable to null when the user types something
    • display the errorText if the user pressed the button with an empty input

To remember - setState

Whenever you need to change the state of a variable along the lifetime of the app:

  1. Declare a variable
  2. Use the variable
  3. Change the variable in setState

Contributors