indicator_tab_bar 1.3.0

A fixed-width tab indicator that underlines the label rather than the tab, and a sliver AnimatedSwitcher for cross-fading the body each tab selects.

Changelog

1.3.0

• LineTabIndicator.shadows — shadows cast by the bar, painted beneath it. A zero-offset shadow with a blur is a glow. They follow the bar's shape, lerp with it, and fade with it when one side of a lerp is null.
• Fixed: the gradient shader a LineTabIndicator built was never disposed, so a bar sliding between tabs left one native shader per frame to the garbage collector. The painter now disposes the shader it replaces and the one it holds when TabBar disposes the painter.
• SliverAnimatedSwitcher swaps at once when the platform asks for reduced motion (MediaQuery.disableAnimations).
• Releases are published to pub.dev from a version tag by .github/workflows/publish.yml.

1.2.1

• No change to the published code. CI now runs on macos-latest, the platform the example's screenshot goldens are recorded on, so they no longer fail over pixels nobody changed.

1.2.0

• Fixed: LineTabIndicator.lerp no longer trips the non-negative asserts on strokeWidth, indicatorWidth or radius when an overshooting curve (elasticOut, easeOutBack) drives t outside 0..1; they are floored at 0.
• Fixed: a gradient bar repainted with the same rect but a different text direction no longer reuses a shader built for the old direction, so directional gradients (AlignmentDirectional, GradientRotation) follow the reading direction.
• CI moved to the shared reusable workflow in CtrlAltDevelop/ci-workflows: formatting, analyze --fatal-infos, the tests, the example, a changelog entry per version, and a pana score with no points lost.
• Dependency bounds are explicit ranges rather than carets — a floor that resolves on the supported SDK, the next major as the ceiling — so a consumer already on an older version in the same major is not forced to move.
• The README carries the pub, pub points, CI and licence badges the other packages here carry.

1.1.0

• LineTabIndicator.alignment — where the bar sits inside the tab. It still defaults to Alignment.bottomCenter, so nothing moves unless you ask; Alignment.topCenter makes it an overline for a TabBar below what it selects, and AlignmentDirectional.bottomStart tucks it under the leading edge of the label and flips with the reading direction.
• LineTabIndicator.insets — deflates the rect the bar is aligned within, so an underline can be lifted clear of the bottom edge and let the TabBar divider show beneath it.
• LineTabIndicator.gradient constructor — fills the bar with a Gradient instead of a flat colour. The gradient is laid out across the bar itself, not across the tab, so it runs over exactly indicatorWidth logical pixels, and its shader is rebuilt only when the bar moves.
• hitTest, getClipPath and painting now resolve TextDirection, falling back to TextDirection.ltr for callers that have none to give.
• A null side of lerp now fades the fill towards transparent without moving the bar, gradients included, instead of lerping the colour alone.
• copyWith, ==, hashCode and debugFillProperties cover the new fields.

1.0.0

• First release.
• LineTabIndicator — a TabBar.indicator decoration that draws a bar of a fixed indicatorWidth, centred on the bottom edge of the tab, rather than one sized to the tab or to its label. A tab narrower than the bar gets one that overhangs it evenly.
• The bar is a rounded rectangle strokeWidth tall and exactly indicatorWidth wide, with radius clamped to strokeWidth / 2 — past half the height the ends are already semicircles and there is nothing left to round.
• Value semantics: ==, hashCode, copyWith, debugFillProperties, and lerpFrom/lerpTo over every field, so the indicator animates across a theme change and a rebuild that changes nothing does not repaint.
• hitTest and getClipPath describe the bar itself, not the whole rect it was laid out in.
• SliverAnimatedSwitcher — an AnimatedSwitcher for slivers, for a tab body living in a CustomScrollView. The plain one stacks its children in a Stack and wraps them in box transitions, neither of which a sliver survives.
• Only the incoming sliver animates: slivers cannot be overlaid, so the outgoing one is dropped as the swap begins. switchOutCurve and reverseDuration are deliberately absent rather than present and inert.
• transitionBuilder for a transition other than the default SliverFadeTransition.
• No Material import anywhere in lib/. TabBar.indicator takes a plain Decoration, so the indicator serves a TabBar from package:flutter/material.dart and one from the material_ui fork alike.
• README images are generated from the real widgets by example/test/screenshots_test.dart.