Initial commit: Krow Worker App

2026-09-17 22:26:11 +05:30
commit cafffd27e0
113 changed files with 13067 additions and 0 deletions
--- a/lib/core/transitions.dart
+++ b/lib/core/transitions.dart
@@ -0,0 +1,84 @@
+import 'package:flutter/material.dart';
+import 'package:go_router/go_router.dart';
+
+/// Page transitions, kept in one place so every screen arrives the same way.
+///
+/// Two kinds only. Moving *deeper* (a shift, a document, a timecard) slides
+/// forward, and the screen behind it slides back a little so the stack reads
+/// as a stack. Moving *sideways* — between steps of sign-up, or replacing the
+/// whole screen — cross-fades, because nothing is being pushed onto anything.
+abstract final class Transitions {
+  static const _forward = Duration(milliseconds: 320);
+  static const _back = Duration(milliseconds: 260);
+
+  /// Pushed detail screens.
+  static CustomTransitionPage<T> push<T>(GoRouterState state, Widget child) {
+    return CustomTransitionPage<T>(
+      key: state.pageKey,
+      child: child,
+      transitionDuration: _forward,
+      reverseTransitionDuration: _back,
+      transitionsBuilder: (context, animation, secondaryAnimation, child) {
+        final incoming = CurvedAnimation(
+          parent: animation,
+          curve: Curves.easeOutCubic,
+          reverseCurve: Curves.easeInCubic,
+        );
+        // The outgoing screen eases back rather than sitting still, which is
+        // what gives the push its depth.
+        final outgoing = CurvedAnimation(
+          parent: secondaryAnimation,
+          curve: Curves.easeOutCubic,
+          reverseCurve: Curves.easeInCubic,
+        );
+
+        // secondaryAnimation rests at 0 while this page is on top, so the
+        // resting state has to be `begin`. Reversing these two leaves every
+        // pushed screen sitting 12% off to the left.
+        return SlideTransition(
+          position: Tween(
+            begin: Offset.zero,
+            end: const Offset(-0.12, 0),
+          ).animate(outgoing),
+          child: FadeTransition(
+            opacity: Tween(begin: 1.0, end: 0.0).animate(outgoing),
+            child: SlideTransition(
+              position: Tween(
+                begin: const Offset(1, 0),
+                end: Offset.zero,
+              ).animate(incoming),
+              child: child,
+            ),
+          ),
+        );
+      },
+    );
+  }
+
+  /// Screens that replace what came before: splash, onboarding, sign-in steps.
+  static CustomTransitionPage<T> fade<T>(GoRouterState state, Widget child) {
+    return CustomTransitionPage<T>(
+      key: state.pageKey,
+      child: child,
+      transitionDuration: _forward,
+      reverseTransitionDuration: _back,
+      transitionsBuilder: (context, animation, secondaryAnimation, child) {
+        final curved = CurvedAnimation(
+          parent: animation,
+          curve: Curves.easeOutCubic,
+        );
+        return FadeTransition(
+          opacity: curved,
+          // A few pixels of rise stops the cross-fade feeling inert.
+          child: SlideTransition(
+            position: Tween(
+              begin: const Offset(0, 0.015),
+              end: Offset.zero,
+            ).animate(curved),
+            child: child,
+          ),
+        );
+      },
+    );
+  }
+}