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Complete User Journeys Deterministic State Machines

Complete App Flows

Real-world multi-state Flutter workflows. Each flow includes simulated network latency, edge-case recovery, state explanations, and full downloadable source projects.

Release R1 FL01

FL01: Pagination & Infinite Scroll

Initial load, page appending, retry on failure, and duplicate trigger prevention

A robust pagination workflow with scroll debounce, request identity tokens, failure retry policy, and duplicate item suppression.

Exercised States & Transitions:
Initial Loading Page Appending Empty State End of Feed Retry on Error Duplicate Debounce
Release R1 FL02

FL02: Debounced Ordered Search

Debounce timing, out-of-order completion guards, query clearance, and disposal cleanup

Guarantees that older slow network search replies never overwrite newer fast search queries, with clean stream and controller disposal.

Exercised States & Transitions:
Debouncing Loading Results Empty Query No Results Found Out-of-Order Rejection Dispose Cleanup
Release R3 FL03

FL03: Validated Asynchronous Forms

Field-level validation, preserved input, async check, and duplicate submission prevention

Production form handling with instant and asynchronous field checks, accessible error labels, and double-tap submit prevention.

Exercised States & Transitions:
Initial Empty Field Focused Validation Error Async Validating Submit Debounce Success Feedback
Release R3 FL04

FL04: Upload Progress & Cancellation

Determinate and indeterminate progress, abort controller, retry, and late callbacks

Handles indeterminate byte estimation, smooth percentage transitions, user cancellation races, and late callback guards.

Exercised States & Transitions:
Indeterminate Connecting Determinate Progress Cancelled by User Upload Failed Complete Success
Release R3 FL05

FL05: E-Commerce Cart Interactions

Quantity limits, stock verification, exact integer currency, and optimistic updates

Eliminates floating-point rounding errors by calculating totals in exact minor units (cents), with inventory bounds checking.

Exercised States & Transitions:
Item Added Quantity Updated Stock Limit Reached Item Removed Empty Cart Order Total Calc
Seeded Simulation Notice: Network and file upload interactions are executed against controlled in-memory repositories. Source exports include the mock service and document where developers hook into real REST/GraphQL backends.