micha_core 0.0.1

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Extensions and widgets that are missing in Flutter's SDK.

Features #

• Declarative extensions to avoid loops and imperative logic.
• Useful widgets, like a Gap widget to avoid the use of Padding.

Usage #

Separate items of collections #

Need to add some items between existing items of a List or Iterable? Use collection.separated(separator):

[1, 2, 3].separated(0); // [1, 0, 2, 0, 3]

Are these separators dependent on preceding and succeeding items? Use collection.separatedBy((before, after) => separator):

[1, 2, 3].separatedBy((before, after) => before + after); // [1, 3, 2, 5, 3]

Gap #

We often require some small space between widgets. Flutter's widget catalog has limited options:

• Flutter's Spacer takes up all available space, which is often more than we want.
• Flutter's Padding unfortunately needs to be wrapped around widgets, adding boilerplate, while also being hard to read inside of lists.
• The best that Flutter offers is a SizedBox with a specified width or height.
  However, this still has some problems: We need to set either width or height, depending on whether the SizedBox is placed inside a Row or Column.
  We also need to repeat the same constant pixel size all throughout the application.

Instead, consider using a Gap:

@override
Widget build(BuildContext context) {
  return Column(
    children: [
      Text('first'),
      Gap(),
      Text('second'),
    ],
  );
}

Gap takes up a fixed space of 16 pixels in both directions.
When you need a little more or a little less space, just multiply or divide the Gap, like Gap() * 2 or Gap() / 2.

StyledText #

Avoid accessing ThemeData manually to set a themed textStyle. Use a StyledText widget instead:

return StyledText.headlineMedium('Some headline');