feat: add a compact composer layout and a fixed-height mode - #51
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Included review availability: This review used your included allowance. Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughFlowComposer now supports compact and expanded layouts, wrap-triggered promotion, bounded-height expansion, configurable button labels, and updated Enter-key handling. StacFlowChatView exposes layout and localized labels. Documentation and playground examples describe and demonstrate these options. ChangesComposer layout and interaction
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
actor User
participant TextEditingController
participant FlowComposer
participant TextPainter
User->>TextEditingController: Enter draft text
TextEditingController->>FlowComposer: Notify controller listener
FlowComposer->>TextPainter: Measure text against available field width
TextPainter-->>FlowComposer: Return measured text width
FlowComposer->>FlowComposer: Promote compact layout when text wraps
Merge Risk: ⚪ Minimal · up to No actionable merge-blocking issue was identified. Compact-to-card promotion appears to preserve the draft and focus. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The new layouts change presentation and keyboard behavior, but the reviewed paths keep message sending, attachments, and stopping under the existing chat callbacks. No introduced security concern was established; security coverage remains incomplete. Retained concerns Security review detailsSecurity Blast Radius
Trust Boundaries and Controls
Resilience and Maintainability Implications
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In `@packages/flow_ui/lib/src/widgets/flow_composer.dart`:
- Around line 575-607: Re-evaluate compact promotion when inherited text metrics
change by overriding didChangeDependencies in the FlowComposer state and
recalculating promotion with _wantsPromotion(context). Update _promoted when the
result changes, without calling setState during dependency updates.
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AGENTS.mdCLAUDE.mddocs/src/content/docs/components/composer.mdxpackages/flow_ui/CHANGELOG.mdpackages/flow_ui/README.mdpackages/flow_ui/example/lib/main.dartpackages/flow_ui/lib/src/widgets/flow_composer.dartpackages/stacflow/CHANGELOG.mdpackages/stacflow/lib/src/chat/stacflow_chat_view.dartpackages/stacflow/lib/src/strings.dartplayground/lib/src/demo_registry.dartplayground/lib/src/demos/composer_demo.dartplayground/lib/src/demos/full_chat_demo.dart
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Summary
Part of #48: a compact composer for simple flows, plus a fixed-height mode, a tighter default card, and three fixes found while reviewing the composer.
layout: FlowComposerLayout.compactfoldsFlowComposerinto a single-row pill: the attach button,leadingActions, the field,trailingActionsand send sit inline, with no action row and nothing drawn for controls that aren't wired. Pending attachments sit in a strip above the row, with the field still inline. The pill opens into the full card once the draft wraps past one line and folds back when the draft is empty. The field keeps its focus and draft across both, because aGlobalKeyreparents the oneTextFieldinstead of rebuilding it.expands: truemakes the card fill the height its parent gives it. The field takes the space above the action row and scrolls inside it. LikeTextField.expands, it needs a bounded height, and it works with the full card only (it asserts with compact).sendTooltipandstopTooltipname the send and stop buttons. Both now report as buttons with their enabled state, so a disabled send button no longer drops out of the accessibility tree.StacFlowChatViewgainscomposerLayout, andFlowStrings.send/FlowStrings.stoplabel the two buttons.Reviewer notes:
TextPainterin the field's effective style: the theme's input style merged under the composer's, asTextFielddoes, plus the caret margin. It runs in the controller listener, so the switch lands in the same frame as the keystroke. A small render probe reports the field's width, which keeps the composer measurable inside intrinsic-sizing parents; there's noLayoutBuilder.AnimatedSizewithDuration.zeroasserts in debug builds when its child resizes.AnimatedSizeassert in debug under reduced motion; the field inherits Material's 0.5 letter spacing.Screenshots
How this was verified
Checklist
dart run melos run analyzeis cleandart run melos run formatapplieddependencies:inpackages/flow_ui/pubspec.yamlis flutter.dev-published, forces no configuration on hosts that never use the feature, and is argued in this PR (none added)packages/flow_ui/lib/flow_ui.dartand documented indocs/and the README tablepackages/flow_ui/CHANGELOG.mdupdated for user-facing changes, with breaking changes called outfeat:,fix:,refactor:,docs:,chore:)Note
Medium Risk
Changes core message-input layout, keyboard submit behavior, and accessibility for send/stop; regressions would affect every chat screen using FlowComposer or StacFlowChatView.
Overview
FlowComposer gains a compact layout (
FlowComposerLayout.compact): a single-row pill with inline attach, actions, field, and send that auto-expands to the full card when the draft wraps or contains a newline, then folds back when empty.expands: truelets the default card fill a parent-given height with a scrollable field (expanded layout only; asserts with compact). The default card is shorter (~95px vs ~116px) by dropping the field min-height and tightening spacing.Send/stop pick up
sendTooltip/stopTooltipwith proper button semantics so disabled send stays in the a11y tree. Enter handling is fixed for IME composition (confirm, don’t send), and Enter no longer adds newlines while streaming.StacFlowChatView exposes
composerLayout;FlowStrings.send/stopwire through to the composer. Docs, playground variants (compact, fixed height), changelogs, and roadmap rows are updated.Reviewed by Cursor Bugbot for commit 98bfa5c. Bugbot is set up for automated code reviews on this repo. Configure here.
Summary by CodeRabbit
New Features
Bug Fixes
Documentation