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added RTL support #33

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added RTL support #33

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71 changes: 46 additions & 25 deletions lib/src/tab_bar.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -115,7 +115,8 @@ class SegmentedTabControl extends StatelessWidget {
}
}

class _SegmentedTabControl extends StatefulWidget implements PreferredSizeWidget {
class _SegmentedTabControl extends StatefulWidget
implements PreferredSizeWidget {
const _SegmentedTabControl({
super.key,
required this.height,
Expand Down Expand Up @@ -210,7 +211,8 @@ class _SegmentedTabControlState extends State<_SegmentedTabControl>
}

void _calculateTotalFlex() {
_totalFlex = widget.tabs.fold(0, (previousValue, tab) => previousValue + tab.flex);
_totalFlex =
widget.tabs.fold(0, (previousValue, tab) => previousValue + tab.flex);
}

void _calculateFlexFactors() {
Expand All @@ -232,7 +234,8 @@ class _SegmentedTabControlState extends State<_SegmentedTabControl>
}

void _updateTabController() {
final TabController? newController = widget.controller ?? DefaultTabController.of(context);
final TabController? newController =
widget.controller ?? DefaultTabController.of(context);
assert(() {
if (newController == null) {
throw FlutterError(
Expand All @@ -259,7 +262,8 @@ class _SegmentedTabControlState extends State<_SegmentedTabControl>

if (_controller != null) {
_controller!.animation!.addListener(_handleTabControllerAnimationTick);
_currentIndicatorAlignment = _animationValueToAlignment(_controller!.index.toDouble());
_currentIndicatorAlignment =
_animationValueToAlignment(_controller!.index.toDouble());
}
}

Expand Down Expand Up @@ -311,9 +315,11 @@ class _SegmentedTabControlState extends State<_SegmentedTabControl>
final tabLeftX = index > 0 ? flexFactors[index - 1] * _maxWidth : 0;
double target;
if (reminder > 0) {
target = tabLeftX + ((reminder * 2) * (alignmentXRanges[index].endInclusive - tabLeftX));
target = tabLeftX +
((reminder * 2) * (alignmentXRanges[index].endInclusive - tabLeftX));
} else {
target = tabLeftX + ((reminder * 2) * (tabLeftX - alignmentXRanges[index].start));
target = tabLeftX +
((reminder * 2) * (tabLeftX - alignmentXRanges[index].start));
}

return target;
Expand All @@ -324,10 +330,11 @@ class _SegmentedTabControlState extends State<_SegmentedTabControl>
final currentTabHalfWidth = tabWidth / 2;
final halfMaxWidth = _maxWidth / 2;

final x =
(position - halfMaxWidth + currentTabHalfWidth) / (halfMaxWidth - currentTabHalfWidth);
final x = (position - halfMaxWidth + currentTabHalfWidth) /
(halfMaxWidth - currentTabHalfWidth);

return Alignment(x, 0);
final isRTL = Directionality.of(context) == TextDirection.rtl;
return Alignment(isRTL ? -x : x, 0);
}

TickerFuture _animateIndicatorTo(Alignment target) {
Expand All @@ -343,25 +350,30 @@ class _SegmentedTabControlState extends State<_SegmentedTabControl>
Widget build(BuildContext context) {
final currentTab = widget.tabs[_internalIndex];

final textStyle = widget.textStyle ?? Theme.of(context).textTheme.bodyMedium!;
final textStyle =
widget.textStyle ?? Theme.of(context).textTheme.bodyMedium!;

final selectedTextStyle = widget.selectedTextStyle ?? textStyle;

final selectedTabTextColor =
currentTab.selectedTextColor ?? widget.selectedTabTextColor ?? Colors.white;
final selectedTabTextColor = currentTab.selectedTextColor ??
widget.selectedTabTextColor ??
Colors.white;

final tabTextColor =
currentTab.textColor ?? widget.tabTextColor ?? Colors.white.withOpacity(0.7);
final tabTextColor = currentTab.textColor ??
widget.tabTextColor ??
Colors.white.withOpacity(0.7);

return DefaultTextStyle(
style: widget.textStyle ?? DefaultTextStyle.of(context).style,
child: LayoutBuilder(
builder: (context, _) {
final indicatorWidth = ((_maxWidth - widget.indicatorPadding.horizontal) / _totalFlex) *
widget.tabs[_internalIndex].flex;
final indicatorWidth =
((_maxWidth - widget.indicatorPadding.horizontal) / _totalFlex) *
widget.tabs[_internalIndex].flex;

return ClipRRect(
borderRadius: widget.barDecoration?.borderRadius ?? BorderRadius.zero,
borderRadius:
widget.barDecoration?.borderRadius ?? BorderRadius.zero,
child: SizedBox(
height: widget.height,
child: Stack(
Expand Down Expand Up @@ -407,7 +419,8 @@ class _SegmentedTabControlState extends State<_SegmentedTabControl>
duration: kTabScrollDuration,
curve: Curves.ease,
width: indicatorWidth,
height: widget.height - widget.indicatorPadding.vertical,
height: widget.height -
widget.indicatorPadding.vertical,
decoration: widget.indicatorDecoration?.copyWith(
color: currentTab.color,
gradient: currentTab.gradient,
Expand Down Expand Up @@ -478,7 +491,8 @@ class _SegmentedTabControlState extends State<_SegmentedTabControl>
return (details) {
_internalAnimationController.stop();
setState(() {
_currentTilePadding = EdgeInsets.symmetric(vertical: widget.squeezeIntensity);
_currentTilePadding =
EdgeInsets.symmetric(vertical: widget.squeezeIntensity);
});
};
}
Expand All @@ -488,7 +502,8 @@ class _SegmentedTabControlState extends State<_SegmentedTabControl>
return null;
}
return (details) {
double x = _currentIndicatorAlignment.x + details.delta.dx / (maxWidth / widget.tabs.length);
double x = _currentIndicatorAlignment.x +
details.delta.dx / (maxWidth / widget.tabs.length);
if (x < -1) {
x = -1;
} else if (x > 1) {
Expand All @@ -503,9 +518,11 @@ class _SegmentedTabControlState extends State<_SegmentedTabControl>

int _alignmentToIndex(Alignment alignment) {
final currentPosition = _xToPercentsCoefficient(alignment);
final roundedCurrentPosition = num.parse(currentPosition.toStringAsFixed(2));
final roundedCurrentPosition =
num.parse(currentPosition.toStringAsFixed(2));

final index = flexFactors.indexWhere((flexFactor) => roundedCurrentPosition <= flexFactor);
final index = flexFactors
.indexWhere((flexFactor) => roundedCurrentPosition <= flexFactor);

return index == -1 ? _controller!.length - 1 : index;
}
Expand All @@ -528,7 +545,8 @@ class _SegmentedTabControlState extends State<_SegmentedTabControl>
};
}

TickerFuture _animateIndicatorToNearest(Offset pixelsPerSecond, double width) {
TickerFuture _animateIndicatorToNearest(
Offset pixelsPerSecond, double width) {
final nearest = _internalIndex;
final target = _animationValueToAlignment(nearest.toDouble());
_internalAnimation = _internalAnimationController.drive(AlignmentTween(
Expand Down Expand Up @@ -588,7 +606,8 @@ class _Labels extends StatelessWidget {
flex: tab.flex,
child: InkWell(
splashColor: tab.splashColor ?? splashColor,
highlightColor: tab.splashHighlightColor ?? splashHighlightColor,
highlightColor:
tab.splashHighlightColor ?? splashHighlightColor,
borderRadius: radius as BorderRadius?,
onTap: callbackBuilder?.call(index),
child: Padding(
Expand All @@ -597,7 +616,9 @@ class _Labels extends StatelessWidget {
child: AnimatedDefaultTextStyle(
duration: kTabScrollDuration,
curve: Curves.ease,
style: (index == currentIndex) ? selectedTextStyle : textStyle,
style: (index == currentIndex)
? selectedTextStyle
: textStyle,
child: Text(
tab.label,
overflow: TextOverflow.clip,
Expand Down