Morph Route ✨

---

iOS 26-inspired container morph for Flutter.

Tap a card, watch it expand into a full screen — and the screen behind it blur, tint, and step back like it's making room. morph_route is a modified OpenContainer plus two helper widgets that wire all of this up for you.

What you get out of the box:

• 🌫 Backdrop blur on the underlying screen as the morph opens.
• 🎨 Accent scrim — a low-alpha brand color washed over the host UI for warmth.
• 🎲 iOS 26-style 3D tilt that peaks at the morph's midpoint and resolves flat on both ends.
• 📦 Scaffold-level recede so the host UI scales down in lock-step with the morph.

📦 Install

dependencies:
  morph_route: ^0.1.2

Or flutter pub add morph_route.

🚀 30-second quickstart

import 'package:flutter/material.dart';
import 'package:morph_route/morph_route.dart';

class HomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      // 1. Wrap your body so it scales down behind any active morph route.
      body: MorphRecede(
        child: Center(
          // 2. Use MorphTile in place of a regular button/card.
          child: MorphTile(
            transitionDuration: const Duration(milliseconds: 460),
            reverseTransitionDuration: const Duration(milliseconds: 340),
            closedColor: Colors.white,
            openColor: Colors.white,
            closedShape: RoundedRectangleBorder(
              borderRadius: BorderRadius.circular(16),
            ),
            closedShadows: const [
              BoxShadow(blurRadius: 4, color: Colors.black12),
            ],
            // The premium bits:
            openBlurSigma: 12,
            scrimColor: const Color(0x14D97757), // 8% coral
            peakTiltY: 0.09,                     // ~5° Y rotation mid-flight
            // Press feedback:
            pressedScale: 0.98,
            pressedOverlayColor: Colors.black12,
            onTap: () { /* haptics, analytics */ },
            closedBuilder: (context) => SizedBox(
              width: 160, height: 80,
              child: const Center(child: Text('Open')),
            ),
            openBuilder: (context, _) => const DetailScreen(),
          ),
        ),
      ),
    );
  }
}

🧩 API surface

Widget	What it does	When to reach for it
MorphTile	A pressable tile that morphs into a destination route. Wraps OpenContainer with idiomatic press feedback (subtle scale + tinted overlay).	95% of callers — start here.
MorphRecede	Wraps a scaffold body so it scales down (and optionally translates) as a morph route opens, synced to OpenContainer.activeProgress.	The "host UI is stepping back" feel.
OpenContainer	The morph route itself.	When you need finer control than MorphTile gives — programmatic open, custom press feedback, etc.

Full dartdoc lives next to each class in lib/src/.

🎛 Tunable knobs you'll actually reach for

On MorphTile / OpenContainer:

• transitionDuration / reverseTransitionDuration — open vs close timing. Defaults are 300ms / same. We recommend 460ms open, 340ms close (Emil Kowalski's "exits should be snappier than entrances").
• openBlurSigma — Gaussian blur on the underlying screen at full open. 0 = off. 8–12 reads as "out of focus" without becoming frosted glass.
• scrimColor — color washed over the underlying screen. Default transparent. Low-alpha brand accent (e.g. 0x14D97757) gives a warm signal without being a tint.
• peakTiltY / peakTiltX — radians of rotation at the morph's midpoint (0 at both endpoints, peak at 0.5, follows sin(π·t)). 0.05–0.10 rad ≈ 3°–6°. More than that flips.
• tiltPerspective — 1 / focal-length for the 3D matrix. 0.0015 ≈ 660-unit focal length.
• transitionType — fade (default) or fadeThrough. fadeThrough cross-fades through middleColor.

On MorphRecede:

• scaleFloor — scale at full open (default 0.94). 1.0 disables.
• curve — applied to the raw progress before scaling. Default Curves.ease (gentle, symmetric on close). Aggressive ease-out feels "snappy" on close.
• progress — override the source notifier. Defaults to OpenContainer.activeProgress.

⚠️ Caveats

• One morph at a time. OpenContainer.activeProgress is a single global ValueNotifier<double>, so two morphs running concurrently would clobber each other's published value. Fine for typical UX. If you need multi-morph, fork the package or pass an explicit notifier (not currently supported).
• BackdropFilter is real GPU work. The package skips the BackdropFilter layer entirely when blurSigma <= 0.01, but at non-zero values it samples and blurs the underlying tree every frame of the morph. Budget accordingly on low-end devices.
• Reduced-motion not honored yet. MediaQuery.disableAnimations isn't respected. Planned follow-up.
• Tilt and hit-testing. A tilted card has a tilted hit region. We don't accept input mid-morph anyway, so it's a non-issue in practice.

Attribution

OpenContainer is vendored from package:animations (BSD-3, Flutter Authors), with several modifications documented in the file header. We retain the original copyright and add ours, both under BSD-3.

License

BSD-3-Clause. See LICENSE.