flutter_debugframesize is an library to support widget extension to debug frame sizes in app runtime. It may be your pixel-perfect design UI debugging companion.

Pub link: https://pub.dev/packages/flutter_debugframesize

Features

Show frame sizes for your specific widgets on screen.

Getting started

Add to pubspec.yaml: flutter_debugframesize: ^1.0.0

Run this code before you render any widget to force disable it for production environment

// default
FlutterDebugFrameSizeConstants.isNeverEnabled = kReleaseMode;

// disable for all envs
FlutterDebugFrameSizeConstants.isNeverEnabled = true;

// enable for all envs
FlutterDebugFrameSizeConstants.isNeverEnabled = false;

How to runtime toggle it

FlutterDebugFrameSizeConstants.isEnabled.value = !FlutterDebugFrameSizeConstants.isEnabled.value;

Usage

Refer to /example

Padding(
  padding: const EdgeInsets.symmetric(horizontal: 40),
  child: const SizedBox(width: double.infinity, height: 20).debugFrameSize(),
),

Image.network(
  'https://docs.flutter.dev/assets/images/dash/dash-fainting.gif')
  .debugFrameSize(
    debugFrameSizeBodyStyle: const DebugFrameSizeBodyStyle(
      color: Color(0xFF00cc00),
      fontSize: 20,
      thickness: 4,
      dashPattern: [10, 10],
    ),
  ),