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Refactoring if chains into switch statements (flutter#144905)
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Based on issue flutter#144903, this PR aims to bring the codebase more in line with the [Flutter repo style guide](https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo#avoid-using-if-chains-or--or--with-enum-values):

> #### Avoid using `if` chains or `?:` or `==` with enum values

<br>

This change unfortunately increases the total line length, but it also improves readability.
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@nate-thegrate
nate-thegrate authored Mar 11, 2024
1 parent 187ec75 commit 26e379e
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Showing 20 changed files with 404 additions and 349 deletions.
17 changes: 9 additions & 8 deletions dev/integration_tests/flutter_gallery/lib/demo/material/bottom_navigation_demo.dart
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Expand Up @@ -40,14 +40,15 @@ class NavigationIconView {

FadeTransition transition(BottomNavigationBarType type, BuildContext context) {
Color? iconColor;
if (type == BottomNavigationBarType.shifting) {
iconColor = _color;
} else {
final ThemeData theme = Theme.of(context);
final ColorScheme colorScheme = theme.colorScheme;
iconColor = theme.brightness == Brightness.light
? colorScheme.primary
: colorScheme.secondary;
switch (type) {
case BottomNavigationBarType.shifting:
iconColor = _color;
case BottomNavigationBarType.fixed:
final ThemeData theme = Theme.of(context);
iconColor = switch (theme.brightness) {
Brightness.light => theme.colorScheme.primary,
Brightness.dark => theme.colorScheme.secondary,
};
}

return FadeTransition(
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17 changes: 10 additions & 7 deletions dev/manual_tests/lib/overlay_geometry.dart
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Expand Up @@ -37,13 +37,16 @@ class _MarkerPainter extends CustomPainter {
..color = const Color(0xFFFFFFFF)
..style = PaintingStyle.stroke
..strokeWidth = 1.0;
if (type == MarkerType.topLeft) {
canvas.drawLine(Offset(r, r), Offset(r + r - 1.0, r), paint);
canvas.drawLine(Offset(r, r), Offset(r, r + r - 1.0), paint);
}
if (type == MarkerType.bottomRight) {
canvas.drawLine(Offset(r, r), Offset(1.0, r), paint);
canvas.drawLine(Offset(r, r), Offset(r, 1.0), paint);

switch (type) {
case MarkerType.topLeft:
canvas.drawLine(Offset(r, r), Offset(r + r - 1.0, r), paint);
canvas.drawLine(Offset(r, r), Offset(r, r + r - 1.0), paint);
case MarkerType.bottomRight:
canvas.drawLine(Offset(r, r), Offset(1.0, r), paint);
canvas.drawLine(Offset(r, r), Offset(r, 1.0), paint);
case MarkerType.touch:
break;
}
}

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12 changes: 7 additions & 5 deletions examples/api/lib/material/bottom_app_bar/bottom_app_bar.2.dart
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Expand Up @@ -41,11 +41,13 @@ class _BottomAppBarDemoState extends State<BottomAppBarDemo> {
_isVisible ? FloatingActionButtonLocation.endContained : FloatingActionButtonLocation.endFloat;

void _listen() {
final ScrollDirection direction = _controller.position.userScrollDirection;
if (direction == ScrollDirection.forward) {
_show();
} else if (direction == ScrollDirection.reverse) {
_hide();
switch (_controller.position.userScrollDirection) {
case ScrollDirection.idle:
break;
case ScrollDirection.forward:
_show();
case ScrollDirection.reverse:
_hide();
}
}

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32 changes: 18 additions & 14 deletions packages/flutter/lib/src/cupertino/date_picker.dart
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Expand Up @@ -1021,25 +1021,29 @@ class _CupertinoDatePickerDateTimeState extends State<CupertinoDatePicker> {

// Adds am/pm column if the picker is not using 24h format.
if (!widget.use24hFormat) {
if (localizations.datePickerDateTimeOrder == DatePickerDateTimeOrder.date_time_dayPeriod
|| localizations.datePickerDateTimeOrder == DatePickerDateTimeOrder.time_dayPeriod_date) {
pickerBuilders.add(_buildAmPmPicker);
columnWidths.add(_getEstimatedColumnWidth(_PickerColumnType.dayPeriod));
} else {
pickerBuilders.insert(0, _buildAmPmPicker);
columnWidths.insert(0, _getEstimatedColumnWidth(_PickerColumnType.dayPeriod));
switch (localizations.datePickerDateTimeOrder) {
case DatePickerDateTimeOrder.date_time_dayPeriod:
case DatePickerDateTimeOrder.time_dayPeriod_date:
pickerBuilders.add(_buildAmPmPicker);
columnWidths.add(_getEstimatedColumnWidth(_PickerColumnType.dayPeriod));
case DatePickerDateTimeOrder.date_dayPeriod_time:
case DatePickerDateTimeOrder.dayPeriod_time_date:
pickerBuilders.insert(0, _buildAmPmPicker);
columnWidths.insert(0, _getEstimatedColumnWidth(_PickerColumnType.dayPeriod));
}
}

// Adds medium date column if the picker's mode is date and time.
if (widget.mode == CupertinoDatePickerMode.dateAndTime) {
if (localizations.datePickerDateTimeOrder == DatePickerDateTimeOrder.time_dayPeriod_date
|| localizations.datePickerDateTimeOrder == DatePickerDateTimeOrder.dayPeriod_time_date) {
pickerBuilders.add(_buildMediumDatePicker);
columnWidths.add(_getEstimatedColumnWidth(_PickerColumnType.date));
} else {
pickerBuilders.insert(0, _buildMediumDatePicker);
columnWidths.insert(0, _getEstimatedColumnWidth(_PickerColumnType.date));
switch (localizations.datePickerDateTimeOrder) {
case DatePickerDateTimeOrder.time_dayPeriod_date:
case DatePickerDateTimeOrder.dayPeriod_time_date:
pickerBuilders.add(_buildMediumDatePicker);
columnWidths.add(_getEstimatedColumnWidth(_PickerColumnType.date));
case DatePickerDateTimeOrder.date_time_dayPeriod:
case DatePickerDateTimeOrder.date_dayPeriod_time:
pickerBuilders.insert(0, _buildMediumDatePicker);
columnWidths.insert(0, _getEstimatedColumnWidth(_PickerColumnType.date));
}
}

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43 changes: 24 additions & 19 deletions packages/flutter/lib/src/cupertino/form_section.dart
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Expand Up @@ -210,24 +210,29 @@ class CupertinoFormSection extends StatelessWidget {
),
child: footer!);

return _type == CupertinoListSectionType.base
? CupertinoListSection(
header: headerWidget,
footer: footerWidget,
margin: margin,
backgroundColor: backgroundColor,
decoration: decoration,
clipBehavior: clipBehavior,
hasLeading: false,
children: children)
: CupertinoListSection.insetGrouped(
header: headerWidget,
footer: footerWidget,
margin: margin,
backgroundColor: backgroundColor,
decoration: decoration,
clipBehavior: clipBehavior,
hasLeading: false,
children: children);
switch (_type) {
case CupertinoListSectionType.base:
return CupertinoListSection(
header: headerWidget,
footer: footerWidget,
margin: margin,
backgroundColor: backgroundColor,
decoration: decoration,
clipBehavior: clipBehavior,
hasLeading: false,
children: children,
);
case CupertinoListSectionType.insetGrouped:
return CupertinoListSection.insetGrouped(
header: headerWidget,
footer: footerWidget,
margin: margin,
backgroundColor: backgroundColor,
decoration: decoration,
clipBehavior: clipBehavior,
hasLeading: false,
children: children,
);
}
}
}
31 changes: 16 additions & 15 deletions packages/flutter/lib/src/gestures/arena.dart
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Expand Up @@ -222,22 +222,23 @@ class GestureArenaManager {
if (state == null) {
return; // This arena has already resolved.
}
assert(_debugLogDiagnostic(pointer, '${ disposition == GestureDisposition.accepted ? "Accepting" : "Rejecting" }: $member'));
assert(state.members.contains(member));
if (disposition == GestureDisposition.rejected) {
state.members.remove(member);
member.rejectGesture(pointer);
if (!state.isOpen) {
_tryToResolveArena(pointer, state);
}
} else {
assert(disposition == GestureDisposition.accepted);
if (state.isOpen) {
state.eagerWinner ??= member;
} else {
assert(_debugLogDiagnostic(pointer, 'Self-declared winner: $member'));
_resolveInFavorOf(pointer, state, member);
}
switch (disposition) {
case GestureDisposition.accepted:
assert(_debugLogDiagnostic(pointer, 'Accepting: $member'));
if (state.isOpen) {
state.eagerWinner ??= member;
} else {
assert(_debugLogDiagnostic(pointer, 'Self-declared winner: $member'));
_resolveInFavorOf(pointer, state, member);
}
case GestureDisposition.rejected:
assert(_debugLogDiagnostic(pointer, 'Rejecting: $member'));
state.members.remove(member);
member.rejectGesture(pointer);
if (!state.isOpen) {
_tryToResolveArena(pointer, state);
}
}
}

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80 changes: 42 additions & 38 deletions packages/flutter/lib/src/gestures/monodrag.dart
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Expand Up @@ -349,17 +349,20 @@ abstract class DragGestureRecognizer extends OneSequenceGestureRecognizer {

void _addPointer(PointerEvent event) {
_velocityTrackers[event.pointer] = velocityTrackerBuilder(event);
if (_state == _DragState.ready) {
_state = _DragState.possible;
_initialPosition = OffsetPair(global: event.position, local: event.localPosition);
_finalPosition = _initialPosition;
_pendingDragOffset = OffsetPair.zero;
_globalDistanceMoved = 0.0;
_lastPendingEventTimestamp = event.timeStamp;
_lastTransform = event.transform;
_checkDown();
} else if (_state == _DragState.accepted) {
resolve(GestureDisposition.accepted);
switch (_state) {
case _DragState.ready:
_state = _DragState.possible;
_initialPosition = OffsetPair(global: event.position, local: event.localPosition);
_finalPosition = _initialPosition;
_pendingDragOffset = OffsetPair.zero;
_globalDistanceMoved = 0.0;
_lastPendingEventTimestamp = event.timeStamp;
_lastTransform = event.transform;
_checkDown();
case _DragState.possible:
break;
case _DragState.accepted:
resolve(GestureDisposition.accepted);
}
}

Expand Down Expand Up @@ -421,36 +424,37 @@ abstract class DragGestureRecognizer extends OneSequenceGestureRecognizer {
final Offset position = (event is PointerMoveEvent) ? event.position : (event.position + (event as PointerPanZoomUpdateEvent).pan);
final Offset localPosition = (event is PointerMoveEvent) ? event.localPosition : (event.localPosition + (event as PointerPanZoomUpdateEvent).localPan);
_finalPosition = OffsetPair(local: localPosition, global: position);
if (_state == _DragState.accepted) {
_checkUpdate(
sourceTimeStamp: event.timeStamp,
delta: _getDeltaForDetails(localDelta),
primaryDelta: _getPrimaryValueFromOffset(localDelta),
globalPosition: position,
localPosition: localPosition,
);
} else {
_pendingDragOffset += OffsetPair(local: localDelta, global: delta);
_lastPendingEventTimestamp = event.timeStamp;
_lastTransform = event.transform;
final Offset movedLocally = _getDeltaForDetails(localDelta);
final Matrix4? localToGlobalTransform = event.transform == null ? null : Matrix4.tryInvert(event.transform!);
_globalDistanceMoved += PointerEvent.transformDeltaViaPositions(
transform: localToGlobalTransform,
untransformedDelta: movedLocally,
untransformedEndPosition: localPosition
).distance * (_getPrimaryValueFromOffset(movedLocally) ?? 1).sign;
if (_hasSufficientGlobalDistanceToAccept(event.kind, gestureSettings?.touchSlop)) {
_hasDragThresholdBeenMet = true;
if (_acceptedActivePointers.contains(event.pointer)) {
_checkDrag(event.pointer);
} else {
resolve(GestureDisposition.accepted);
switch (_state) {
case _DragState.ready || _DragState.possible:
_pendingDragOffset += OffsetPair(local: localDelta, global: delta);
_lastPendingEventTimestamp = event.timeStamp;
_lastTransform = event.transform;
final Offset movedLocally = _getDeltaForDetails(localDelta);
final Matrix4? localToGlobalTransform = event.transform == null ? null : Matrix4.tryInvert(event.transform!);
_globalDistanceMoved += PointerEvent.transformDeltaViaPositions(
transform: localToGlobalTransform,
untransformedDelta: movedLocally,
untransformedEndPosition: localPosition
).distance * (_getPrimaryValueFromOffset(movedLocally) ?? 1).sign;
if (_hasSufficientGlobalDistanceToAccept(event.kind, gestureSettings?.touchSlop)) {
_hasDragThresholdBeenMet = true;
if (_acceptedActivePointers.contains(event.pointer)) {
_checkDrag(event.pointer);
} else {
resolve(GestureDisposition.accepted);
}
}
}
case _DragState.accepted:
_checkUpdate(
sourceTimeStamp: event.timeStamp,
delta: _getDeltaForDetails(localDelta),
primaryDelta: _getPrimaryValueFromOffset(localDelta),
globalPosition: position,
localPosition: localPosition,
);
}
}
if (event is PointerUpEvent || event is PointerCancelEvent || event is PointerPanZoomEndEvent) {
if (event case PointerUpEvent() || PointerCancelEvent() || PointerPanZoomEndEvent()) {
_giveUpPointer(event.pointer);
}
}
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9 changes: 5 additions & 4 deletions packages/flutter/lib/src/material/about.dart
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Expand Up @@ -1152,10 +1152,11 @@ class _MasterDetailFlowState extends State<_MasterDetailFlow> implements _PageOp
@override
void openDetailPage(Object arguments) {
_cachedDetailArguments = arguments;
if (_builtLayout == _LayoutMode.nested) {
_navigatorKey.currentState!.pushNamed(_navDetail, arguments: arguments);
} else {
focus = _Focus.detail;
switch (_builtLayout) {
case _LayoutMode.nested:
_navigatorKey.currentState!.pushNamed(_navDetail, arguments: arguments);
case _LayoutMode.lateral || null:
focus = _Focus.detail;
}
}

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32 changes: 24 additions & 8 deletions packages/flutter/lib/src/material/toggle_buttons.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -455,19 +455,35 @@ class ToggleButtons extends StatelessWidget {
// Determines if this is the first child that is being laid out
// by the render object, _not_ the order of the children in its list.
bool _isFirstButton(int index, int length, TextDirection textDirection) {
return index == 0 && ((direction == Axis.horizontal && textDirection == TextDirection.ltr) ||
(direction == Axis.vertical && verticalDirection == VerticalDirection.down))
|| index == length - 1 && ((direction == Axis.horizontal && textDirection == TextDirection.rtl) ||
(direction == Axis.vertical && verticalDirection == VerticalDirection.up));
switch (direction) {
case Axis.horizontal:
return switch (textDirection) {
TextDirection.rtl => index == length - 1,
TextDirection.ltr => index == 0,
};
case Axis.vertical:
return switch (verticalDirection) {
VerticalDirection.up => index == length - 1,
VerticalDirection.down => index == 0,
};
}
}

// Determines if this is the last child that is being laid out
// by the render object, _not_ the order of the children in its list.
bool _isLastButton(int index, int length, TextDirection textDirection) {
return index == length - 1 && ((direction == Axis.horizontal && textDirection == TextDirection.ltr) ||
(direction == Axis.vertical && verticalDirection == VerticalDirection.down))
|| index == 0 && ((direction == Axis.horizontal && textDirection == TextDirection.rtl) ||
(direction == Axis.vertical && verticalDirection == VerticalDirection.up));
switch (direction) {
case Axis.horizontal:
return switch (textDirection) {
TextDirection.rtl => index == 0,
TextDirection.ltr => index == length - 1,
};
case Axis.vertical:
return switch (verticalDirection) {
VerticalDirection.up => index == 0,
VerticalDirection.down => index == length - 1,
};
}
}

BorderRadius _getEdgeBorderRadius(
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