flutter_object_form_field

Working with TextFormField is nice until you want to work with something other than String. For example, if you want invoke date timer picker, you have to create a focus node, listen for focus, show the dialog when needed. If you do not want to use some special object to store the selected value, you will end up with parsing the data before save just because TextFormField only works with String.

This library provides ObjectFormField<T> that works much better for these cases. You provide it with a function that turns your object into String and a picker async function that returns newly picked object (DateTime from date picker).

Usage

To use this plugin, add flutter_object_form_field as a dependency in your pubspec.yaml file.

Examples


//
// USAGE WITH CUSTOM OBJECT
//
ObjectFormField<Emotion>(
  objectToString: (emotion) => emotion?.name,
  pickValue: (oldEmotion) async {
    // returns an emotion object
    return await Navigator.push(
        context,
        MaterialPageRoute(
            builder: (context) => EmotionsPage()));
  },
  decoration: InputDecoration(labelText: 'Emotion'),
  validator: (value) {
    if (value == null) {
      return 'You have to pick an emotion';

    if (value.name == 'Sadness') {
      return 'Show me your smile!';
    }
  },
),
//
// USAGE WITH DATE TIME
//
ObjectFormField<DateTime>(
  // can use some kind of formatter
  objectToString: (dateTime) => dateTime?.toString(),
  pickValue: (oldDate) async {
    return await showDatePicker(
      context: context,
      initialDate: DateTime.now(),
      firstDate: DateTime(1900),
      lastDate: DateTime(2100),
    );
  },
  decoration: InputDecoration(labelText: 'Date'),
  validator: (value) {
    if (value == null) {
      return 'You have to select date';
    }
  },
),

Contribution and Support

Contributions are welcome!
If you want to contribute code please create a PR
If you find a bug or want a feature, please fill an issue

Libraries

flutter_object_form_field

Dart

dart:ui
Built-in types and core primitives for a Flutter application. [...]

Core

dart:async
Support for asynchronous programming, with classes such as Future and Stream. [...]
dart:collection
Classes and utilities that supplement the collection support in dart:core. [...]
dart:convert
Encoders and decoders for converting between different data representations, including JSON and UTF-8. [...]
dart:core
Built-in types, collections, and other core functionality for every Dart program. [...]
dart:developer
Interact with developer tools such as the debugger and inspector. [...]
dart:math
Mathematical constants and functions, plus a random number generator. [...]
dart:typed_data
Lists that efficiently handle fixed sized data (for example, unsigned 8 byte integers) and SIMD numeric types. [...]

VM

dart:io
File, socket, HTTP, and other I/O support for non-web applications. [...]
dart:isolate
Concurrent programming using isolates: independent workers that are similar to threads but don't share memory, communicating only via messages. [...]