Image Component

1. Requirements Document

Overview

A robust image display component capable of handling network URLs, local assets, and files. It features built-in caching, error handling, placeholders, and interactive zooming capabilities.

User Stories

  • As a User, I want images to load instantly if I've seen them before (caching).
  • As a User, I want to pinch-to-zoom on detailed images (e.g., product photos).
  • As a User, I want to see a nice placeholder while the high-res image loads.

Functional Requirements

  1. Sources: Network, Asset, File, Memory.
  2. Display:
    • BoxFit configuration (cover, contain, etc.).
    • Circular/Rounded variants.
  3. Interactivity:
    • Tap to expand/lightbox.
    • Pinch-to-zoom.
  4. Performance:
    • disk and memory caching (via cached_network_image).
    • Resize on decode for memory optimization.

2. Technical Document

Architecture

System Architecture

The ImageView intelligently manages the image lifecycle. It checks layers of cache (Memory → Disk → Network) to ensure the fastest possible load time. The Zoomable Wrappercan be optionally engaged for detailed inspection.

API Design

Usage

MyImage(
  source: "https://example.com/photo.jpg",
  fit: BoxFit.cover,
  enableZoom: true,
  placeholder: ShimmerLoading(),
  errorWidget: Icon(Icons.broken_image),
)