prism_banner

Dismissible in-app announcement banners for Flutter — release notes, promos, and maintenance notices with persistence, scheduling, and full theming.

Part of the Prism package family.

Features

• ✅ One widget: PrismBanner collapses to nothing when there's nothing to show
• ✅ Persistence — dismissals survive app restarts (pluggable store)
• ✅ Version-aware — bump an announcement's version to re-show it to users who already dismissed it
• ✅ Scheduling — startsAt / endsAt windows
• ✅ Severity levels — info, success, warning, error with Material 3 colors
• ✅ Priority selection when multiple announcements compete
• ✅ Optional action button with callback
• ✅ Pure Flutter, all six platforms

Installation

dependencies:
  prism_banner: ^0.1.0

Quick start

Column(
  children: [
    PrismBanner(
      announcements: [
        const PrismAnnouncement(
          id: 'release-2-1',
          title: 'New in 2.1',
          message: 'Dark mode, faster sync, and keyboard shortcuts.',
          actionLabel: 'See what’s new',
        ),
      ],
    ),
    // …the rest of your page…
  ],
)

Re-showing an updated announcement

Users who dismissed release-2-1 won't see it again — unless you bump the version:

const PrismAnnouncement(
  id: 'release-2-1',   // same id
  version: 2,          // bump → everyone sees it again
  message: 'Updated: 2.1.1 fixes sync on iPad!',
)

Custom storage

PrismBanner(
  announcements: myAnnouncements,
  store: MyFirebaseDismissStore(), // implements BannerDismissStore
)

Scheduling

const PrismAnnouncement(
  id: 'maintenance',
  message: 'Downtime Sunday 02:00 UTC.',
  severity: PrismSeverity.warning,
  startsAt: null, // or a fixed DateTime
  endsAt: null,
)

The Prism package family

All pure Flutter, all six platforms, MIT licensed, built to work together.

License

MIT — see LICENSE.