JonasWanke / black_hole_flutter

🛠 A package absorbing all Flutter utility functions, including extension functions and commonly used widgets.

• 📄 Bottom Sheet
• 🏗 BuildContext
• 🎨 Colors
  • 🌈 Material Design colors
• 🧭 Navigation
• 📱 Widgets
  • 🔳 Buttons
  • 🥔 ChipGroup
  • 🥙 FillOrWrap
  • ↔ SeparatedButtons
  • 📚 TitleAndSubtitle
• 🖼 RenderObject
• ↕ Size

📄 Bottom Sheet

Show modal bottom sheets using: context.showModalBottomSheet().

Also, this package adds a custom FancyBottomSheet with a drag indicator at the top. You can create one using context.showFancyModalBottomSheet().

🏗 BuildContext

In Flutter, you often see the pattern <Class>.of(context) (e.g., Theme.of(context)). This package adds extension getters on BuildContext for those classes so you can just say:

🎨 Colors

Handy extensions on Brightness:

isDark, isLight, and contrastColor can also be used on ThemeData directly.

Handy extensions on Color:

And if you can't decide on a color, just use random.nextColor(), random.nextColorHsl() or random.nextColorHsv()!

Convert between alpha and opacity with int.alphaToOpacity and double.opacityToAlpha.

🌈 Material Design colors

Material Design specifies different opacities of white and black colors to use for text of different emphases on colored backgrounds. You can now use the highEmphasisOnColor, mediumEmphasisOnColor and disabledOnColor extension getters on Color to make your text legible!

There are also getters on ThemeData for contrast colors on the primary, accent, background, and error colors.

🧭 Navigation

Access your navigation-related information via extension methods:

Push a new route and pop all previous routes (e.g., when signing out the user):

navigator.pushAndRemoveAll(/* new route */);
// Or using a named route:
navigator.pushNamedAndRemoveAll(/* route name */);

Log navigation events to the console:

MaterialApp(
  navigatorObservers: [LoggingNavigatorObserver()],
  // ...
)
// Prints:
// Navigator: didPush /dashboard → /articles/12345
// Navigator: didPop /dashboard ← /articles/12345

Note: This uses the name of routes, so it only works with named routes. If you want to handle all your routing declaratively with proper deep links, check out my package 🧭 flutter_deep_linking :)

📱 Widgets

🔳 Buttons

Did you ever want to show a progress indicator inside a button? Or were annoyed to conditionally set a Button's onPressed to disable it? Fear no more — black_hole_flutter has got you covered!

In FancyFab (a FloatingActionButton), FancyTextButton, FancyOutlinedButton, and FancyElevatedButton, we introduce some new parameters:

• isLoading: Setting this to true shows a CircularProgressIndicator and disables this button. You can optionally specify a loadingChild (loadingLabel on FancyFab) to show next to the progress indicator.
• isEnabled: Settings this to false disables this button, even if onPressed is set.

🥔 ChipGroup

Wraps multiple chips and can optionally show a title above these.

🥙 FillOrWrap

A layout with two different behaviors:

• By default, all children are positioned next to each other with equal widths. This is comparable to a Row with all children wrapped in Expanded.
• If the children are too wide to fit in a single line, or one child would become smaller than its reported minimum width, the children get positioned below each other ("wrapped"). This is similar to a Column with MainAxisSize.min.

↔ SeparatedButtons

A container wrapping multiple buttons with an interpunct (·) between each one. It's recommended to use TextButtons as children.

📚 TitleAndSubtitle

Did you ever want to show a subtitle (in addition to a main title) in your AppBar? Use TitleAndSubtitle (very creative name, I know):

AppBar(
  title: TitleAndSubtitle(
    title: Text('My title'),
    subtitle: Text('My optional subtitle'),
  ),
)

🖼 RenderObject

When writing a custom layout, you might find this extension on ContainerRenderObjectMixin useful:

↕ Size