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inbox: Fix collapsing a section from its sticky header #560

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merged 1 commit into from
Mar 25, 2024
Merged

inbox: Fix collapsing a section from its sticky header #560

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28 changes: 25 additions & 3 deletions lib/widgets/inbox.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -209,11 +209,19 @@ abstract class _HeaderItem extends StatelessWidget {
final int count;
final bool hasMention;

/// A build context within the [_StreamSection] or [_AllDmsSection].
///
/// Used to ensure the [_StreamSection] or [_AllDmsSection] that encloses the
/// current [_HeaderItem] is visible after being collapsed through this
/// [_HeaderItem].
final BuildContext sectionContext;

const _HeaderItem({
required this.collapsed,
required this.pageState,
required this.count,
required this.hasMention,
required this.sectionContext,
});

String get title;
Expand All @@ -223,7 +231,15 @@ abstract class _HeaderItem extends StatelessWidget {
Color get uncollapsedBackgroundColor;
Color? get unreadCountBadgeBackgroundColor;

void Function() get onCollapseButtonTap;
Future<void> Function() get onCollapseButtonTap => () async {
if (!collapsed) {
await Scrollable.ensureVisible(
sectionContext,
alignmentPolicy: ScrollPositionAlignmentPolicy.keepVisibleAtStart,
);
}
};

void Function() get onRowTap;

@override
Expand Down Expand Up @@ -271,6 +287,7 @@ class _AllDmsHeaderItem extends _HeaderItem {
required super.pageState,
required super.count,
required super.hasMention,
required super.sectionContext,
});

@override get title => 'Direct messages'; // TODO(i18n)
Expand All @@ -280,7 +297,8 @@ class _AllDmsHeaderItem extends _HeaderItem {
@override get uncollapsedBackgroundColor => const Color(0xFFF3F0E7);
@override get unreadCountBadgeBackgroundColor => null;

@override get onCollapseButtonTap => () {
@override get onCollapseButtonTap => () async {
await super.onCollapseButtonTap();
pageState.allDmsCollapsed = !collapsed;
};
@override get onRowTap => onCollapseButtonTap; // TODO open all-DMs narrow?
Expand All @@ -304,6 +322,7 @@ class _AllDmsSection extends StatelessWidget {
hasMention: data.hasMention,
collapsed: collapsed,
pageState: pageState,
sectionContext: context,
);
return StickyHeaderItem(
header: header,
Expand Down Expand Up @@ -386,6 +405,7 @@ class _StreamHeaderItem extends _HeaderItem {
required super.pageState,
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required super.count,
required super.hasMention,
required super.sectionContext,
});

@override get title => subscription.name;
Expand All @@ -397,7 +417,8 @@ class _StreamHeaderItem extends _HeaderItem {
@override get unreadCountBadgeBackgroundColor =>
subscription.colorSwatch().unreadCountBadgeBackground;

@override get onCollapseButtonTap => () {
@override get onCollapseButtonTap => () async {
await super.onCollapseButtonTap();
if (collapsed) {
pageState.uncollapseStream(subscription.streamId);
} else {
Expand Down Expand Up @@ -427,6 +448,7 @@ class _StreamSection extends StatelessWidget {
hasMention: data.hasMention,
collapsed: collapsed,
pageState: pageState,
sectionContext: context,
);
return StickyHeaderItem(
header: header,
Expand Down
2 changes: 2 additions & 0 deletions test/example_data.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -119,6 +119,8 @@ final Account otherAccount = account(

final User thirdUser = user(fullName: 'Third User', email: 'third@example');

final User fourthUser = user(fullName: 'Fourth User', email: 'fourth@example');

////////////////////////////////////////////////////////////////
// Streams and subscriptions.
//
Expand Down
115 changes: 114 additions & 1 deletion test/widgets/inbox_test.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,38 @@ import '../flutter_checks.dart';
import '../model/binding.dart';
import '../model/test_store.dart';

/// Repeatedly drags `view` by `moveStep` until `finder` is invisible.
///
/// Between each drag, advances the clock by `duration`.
///
/// Throws a [StateError] if `finder` is still visible after `maxIteration`
/// drags.
///
/// See also:
/// * [WidgetController.dragUntilVisible], which does the inverse.
Future<void> dragUntilInvisible(
WidgetTester tester,
FinderBase<Element> finder,
FinderBase<Element> view,
Offset moveStep, {
int maxIteration = 50,
Duration duration = const Duration(milliseconds: 50),
}) {
return TestAsyncUtils.guard<void>(() async {
final iteration = maxIteration;
while (maxIteration > 0 && finder.evaluate().isNotEmpty) {
await tester.drag(view, moveStep);
await tester.pump(duration);
maxIteration -= 1;
}
if (maxIteration <= 0 && finder.evaluate().isNotEmpty) {
throw StateError(
'Finder is still visible after $iteration iterations.'
' Consider increasing the number of iterations.');
}
});
}

void main() {
TestZulipBinding.ensureInitialized();

Expand Down Expand Up @@ -51,6 +83,15 @@ void main() {
await tester.pumpAndSettle();
}

List<StreamMessage> generateStreamMessages({
required ZulipStream stream,
required int count,
required List<MessageFlag> flags,
}) {
return List.generate(count, (index) => eg.streamMessage(
stream: stream, topic: '${stream.name} topic $index', flags: flags));
}

/// Set up an inbox view with lots of interesting content.
Future<void> setupVarious(WidgetTester tester) async {
final stream1 = eg.stream(streamId: 1, name: 'stream 1');
Expand All @@ -61,12 +102,16 @@ void main() {
await setupPage(tester,
streams: [stream1, stream2],
subscriptions: [sub1, sub2],
users: [eg.selfUser, eg.otherUser, eg.thirdUser],
users: [eg.selfUser, eg.otherUser, eg.thirdUser, eg.fourthUser],
unreadMessages: [
eg.streamMessage(stream: stream1, topic: 'specific topic', flags: []),
...generateStreamMessages(stream: stream1, count: 10, flags: []),
eg.streamMessage(stream: stream2, flags: []),
...generateStreamMessages(stream: stream2, count: 40, flags: []),
eg.dmMessage(from: eg.otherUser, to: [eg.selfUser], flags: []),
eg.dmMessage(from: eg.otherUser, to: [eg.selfUser, eg.thirdUser], flags: []),
eg.dmMessage(from: eg.thirdUser, to: [eg.selfUser], flags: []),
eg.dmMessage(from: eg.fourthUser, to: [eg.selfUser], flags: []),
]);
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}

Expand Down Expand Up @@ -310,6 +355,28 @@ void main() {
checkAppearsUncollapsed(tester, findSectionContent);
});

testWidgets('collapse all-DMs section when partially offscreen: '
'header remains sticky at top', (tester) async {
await setupVarious(tester);

final listFinder = find.byType(Scrollable);
final dmFinder = find.text(eg.otherUser.fullName).hitTestable();

// Scroll part of [_AllDmsSection] offscreen.
await dragUntilInvisible(
tester, dmFinder, listFinder, const Offset(0, -50));
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Still used the variables instead of directly populating the finders for better readability, but please let me know if you think the other way is better!

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For this dragUntilInvisible call, it can go either way — there's some value in that variable name dmFinder in particular. So arranging it this way is fine.

For headerRow below, though, definitely better to inline. When the definition reads:

          final headerRow = findAllDmsHeaderRow(tester);

there's not really anything the variable name is expressing that wouldn't also be clear from seeing the expression findAllDmsHeaderRow(tester) directly. Similarly headerRowAfterTap.


// Check that the header is present (which must therefore
// be as a sticky header).
check(findAllDmsHeaderRow(tester)).isNotNull();

await tapCollapseIcon(tester);

// Check that the header is still visible even after
// collapsing the section.
check(findAllDmsHeaderRow(tester)).isNotNull();
});

// TODO check it remains collapsed even if you scroll far away and back

// TODO check that it's always uncollapsed when it appears after being
Expand Down Expand Up @@ -385,6 +452,52 @@ void main() {
checkAppearsUncollapsed(tester, 1, findSectionContent);
});

testWidgets('collapse stream section when partially offscreen: '
'header remains sticky at top', (tester) async {
await setupVarious(tester);

final topicFinder = find.text('stream 1 topic 4').hitTestable();
final listFinder = find.byType(Scrollable);

// Scroll part of [_StreamSection] offscreen.
await dragUntilInvisible(
tester, topicFinder, listFinder, const Offset(0, -50));

// Check that the header is present (which must therefore
// be as a sticky header).
check(findStreamHeaderRow(tester, 1)).isNotNull();

await tapCollapseIcon(tester, 1);

// Check that the header is still visible even after
// collapsing the section.
check(findStreamHeaderRow(tester, 1)).isNotNull();
});

testWidgets('collapse stream section in middle of screen: '
'header stays fixed', (tester) async {
await setupVarious(tester);

final headerRow = findStreamHeaderRow(tester, 1);
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@sm-sayedi sm-sayedi Mar 23, 2024 •
edited
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The test for #560 comment was included in the previous revision, just added a few comments in this one.

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Ah, I see, thanks.

// Check that the header is present.
check(headerRow).isNotNull();

final rectBeforeTap = tester.getRect(find.byWidget(headerRow!));
final scrollableTop = tester.getRect(find.byType(Scrollable)).top;
// Check that the header is somewhere in the middle of the screen.
check(rectBeforeTap.top).isGreaterThan(scrollableTop);

await tapCollapseIcon(tester, 1);

final headerRowAfterTap = findStreamHeaderRow(tester, 1);
final rectAfterTap =
tester.getRect(find.byWidget(headerRowAfterTap!));

// Check that the position of the header before and after
// collapsing is the same.
check(rectAfterTap).equals(rectBeforeTap);
});

// TODO check it remains collapsed even if you scroll far away and back

// TODO check that it's always uncollapsed when it appears after being
Expand Down
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