initial commit: LeafViewer, LeafZoomable, LeafContextMenu, LeafPopover, LeafImage, misc widgets + tests
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import 'package:flutter/foundation.dart';
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import 'package:flutter/gestures.dart';
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import 'package:flutter/material.dart';
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import 'package:flutter_test/flutter_test.dart';
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import 'package:leaf_widgets/leaf_widgets.dart';
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Widget _zoomablePage(BuildContext context, int i) => LeafZoomable(
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childSize: const Size(400, 300),
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originalSize: const Size(1600, 1200),
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child: Container(color: const Color(0xFF112233)),
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);
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Widget _harness({
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Widget Function(BuildContext, int)? pageBuilder,
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ValueChanged<int>? onPageChanged,
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VoidCallback? onDismissed,
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VoidCallback? onTapOutside,
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ValueChanged<double>? onProgress,
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bool? enableSwipeGestures,
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}) {
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return MaterialApp(
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home: Scaffold(
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body: LeafViewer(
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pageCount: 3,
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pageBuilder: pageBuilder ?? _zoomablePage,
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onPageChanged: onPageChanged,
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onDismissed: onDismissed,
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onTapOutside: onTapOutside,
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enableSwipeGestures: enableSwipeGestures,
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backgroundBuilder: onProgress == null
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? null
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: (context, p) {
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onProgress(p);
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return Container(color: Colors.black);
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},
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),
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),
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);
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}
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LeafZoomController _controller(WidgetTester tester) {
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return LeafViewer.controllerOf(tester.element(find.byType(LeafZoomable)))!;
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}
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Future<void> _slowDrag(WidgetTester tester, Offset from, Offset delta, {int steps = 8}) async {
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final g = await tester.startGesture(from);
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await tester.pump();
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final step = delta / steps.toDouble();
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for (var i = 0; i < steps; i++) {
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await g.moveBy(step);
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await tester.pump(const Duration(milliseconds: 200));
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}
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await g.up();
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await tester.pumpAndSettle();
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}
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Future<void> _doubleTapAt(WidgetTester tester, Offset pos) async {
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await tester.tapAt(pos);
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await tester.pump(const Duration(milliseconds: 50));
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await tester.tapAt(pos);
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await tester.pump();
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await tester.pump(const Duration(milliseconds: 250));
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}
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Future<void> _wheel(WidgetTester tester, double dy) async {
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await tester.sendEventToBinding(PointerScrollEvent(
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position: const Offset(400, 300),
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scrollDelta: Offset(0, dy),
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kind: PointerDeviceKind.mouse,
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));
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await tester.pump();
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}
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// Pinch from (300,300)/(500,300) outward so the finger distance reaches [targetDist].
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Future<void> _pinchOut(WidgetTester tester, double targetDist) async {
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final g1 = await tester.startGesture(const Offset(300, 300));
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final g2 = await tester.startGesture(const Offset(500, 300));
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await tester.pump();
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final spread = targetDist - 200;
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await g1.moveTo(Offset(300 - spread / 2, 300));
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await g2.moveTo(Offset(500 + spread / 2, 300));
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await tester.pump();
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await g1.up();
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await g2.up();
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await tester.pump(const Duration(milliseconds: 350)); // flush double-tap countdown
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}
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void main() {
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testWidgets('1× horizontal drag pages', (tester) async {
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var page = 0;
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await tester.pumpWidget(_harness(onPageChanged: (i) => page = i));
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await _slowDrag(tester, const Offset(700, 300), const Offset(-500, 0));
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expect(page, 1);
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});
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testWidgets('mouse drag pages (dragDevices fix)', (tester) async {
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var page = 0;
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await tester.pumpWidget(_harness(onPageChanged: (i) => page = i));
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final g = await tester.startGesture(const Offset(700, 300), kind: PointerDeviceKind.mouse);
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await tester.pump();
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for (var i = 0; i < 8; i++) {
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await g.moveBy(const Offset(-62.5, 0));
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await tester.pump(const Duration(milliseconds: 50));
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}
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await g.up();
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await tester.pumpAndSettle();
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expect(page, 1);
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});
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testWidgets('zoomed pan does not page', (tester) async {
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var page = 0;
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await tester.pumpWidget(_harness(onPageChanged: (i) => page = i));
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await _pinchOut(tester, 600); // 3×, anchored at (-50,-150)
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final ctrl = _controller(tester);
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expect(ctrl.scale, 3.0);
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await _slowDrag(tester, const Offset(700, 300), const Offset(150, 0)); // pan right
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expect(ctrl.position.dx, 100);
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expect(page, 0);
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});
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testWidgets('zoomed + clamped at edge releases mid-drag and pages', (tester) async {
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var page = 0;
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await tester.pumpWidget(_harness(onPageChanged: (i) => page = i));
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await _pinchOut(tester, 600); // 3× at (-50,-150)
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final ctrl = _controller(tester);
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await _slowDrag(tester, const Offset(700, 300), const Offset(-250, 0)); // pan to X clamp
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expect(ctrl.position.dx, -200);
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expect(page, 0);
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await _slowDrag(tester, const Offset(700, 300), const Offset(-500, 0)); // released at edge → pages
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expect(page, 1);
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});
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testWidgets('zoomed + clamped vertically: continuing the drag dismisses', (tester) async {
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var dismissed = false;
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await tester.pumpWidget(_harness(onDismissed: () => dismissed = true));
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await _pinchOut(tester, 600); // 3×, Y clamped at -150
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// Drag further up from the top clamp → edge-release dismiss (offset > 25%).
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await _slowDrag(tester, const Offset(400, 400), const Offset(0, -300), steps: 6);
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expect(dismissed, isTrue);
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});
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testWidgets('1× small vertical drag springs back without dismissing', (tester) async {
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var dismissed = false;
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var progress = 1.0;
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await tester.pumpWidget(_harness(onDismissed: () => dismissed = true, onProgress: (p) => progress = p));
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await tester.timedDrag(find.byType(LeafViewer), const Offset(0, 100), const Duration(milliseconds: 300));
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await tester.pumpAndSettle();
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expect(dismissed, isFalse);
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expect(progress, lessThan(0.001)); // spring settles asymptotically, never exactly 0
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});
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testWidgets('1× vertical drag past 25% flies off and dismisses', (tester) async {
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var dismissed = false;
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var sawProgress = false;
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await tester.pumpWidget(_harness(onDismissed: () => dismissed = true, onProgress: (p) {
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if (p > 0.2) sawProgress = true;
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}));
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await tester.timedDrag(find.byType(LeafViewer), const Offset(0, 400), const Duration(milliseconds: 200));
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await tester.pumpAndSettle();
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expect(dismissed, isTrue);
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expect(sawProgress, isTrue);
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});
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testWidgets('1× fast small drag flies off via velocity', (tester) async {
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var dismissed = false;
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await tester.pumpWidget(_harness(onDismissed: () => dismissed = true));
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await tester.timedDrag(find.byType(LeafViewer), const Offset(0, 100), const Duration(milliseconds: 50));
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await tester.pumpAndSettle();
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expect(dismissed, isTrue);
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});
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testWidgets('1× vertical drag anywhere dismisses (no off-image gate)', (tester) async {
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var dismissed = false;
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await tester.pumpWidget(_harness(onDismissed: () => dismissed = true));
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// Image rect is (200,150,400,300) — starting above it still dismisses.
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await tester.timedDragFrom(const Offset(400, 40), const Offset(0, 400), const Duration(milliseconds: 200));
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await tester.pumpAndSettle();
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expect(dismissed, isTrue);
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});
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testWidgets('tap outside the image pops, tap on the image does not', (tester) async {
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var outside = 0;
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await tester.pumpWidget(_harness(onTapOutside: () => outside++));
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await tester.tapAt(const Offset(10, 10));
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await tester.pump(const Duration(milliseconds: 350)); // flush double-tap countdown
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expect(outside, 1);
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await tester.tapAt(const Offset(400, 300));
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await tester.pump(const Duration(milliseconds: 350));
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expect(outside, 1);
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});
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testWidgets('wheel zooms from any scale in both directions', (tester) async {
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await tester.pumpWidget(_harness());
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await _wheel(tester, -1000);
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expect(_controller(tester).scale, closeTo(2.0, 0.01)); // zooms from 1×
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await _wheel(tester, -1000);
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expect(_controller(tester).scale, closeTo(4.0, 0.01));
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await _wheel(tester, 3000);
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expect(_controller(tester).scale, closeTo(1.0, 0.01));
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await _wheel(tester, 1000); // at 1×, wheel down clamps
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expect(_controller(tester).scale, 1.0);
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});
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testWidgets('double-tap cycles 1× → covered → 1:1 → 1× through the viewer', (tester) async {
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await tester.pumpWidget(MaterialApp(
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home: Scaffold(
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body: LeafViewer(
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pageCount: 3,
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pageBuilder: (context, i) => LeafZoomable(
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childSize: const Size(360, 300),
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originalSize: const Size(1440, 1200),
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child: Container(color: const Color(0xFF112233)),
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),
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),
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),
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));
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await _doubleTapAt(tester, const Offset(400, 300));
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expect(_controller(tester).scale, closeTo(2.22, 0.01)); // covered
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await _doubleTapAt(tester, const Offset(400, 300));
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expect(_controller(tester).scale, closeTo(2.0, 0.01)); // 1:1
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await _doubleTapAt(tester, const Offset(400, 300));
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expect(_controller(tester).scale, closeTo(1.0, 0.01));
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});
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testWidgets('pinch zooms around the focal point and focal-pans', (tester) async {
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await tester.pumpWidget(_harness());
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final g1 = await tester.startGesture(const Offset(300, 300));
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final g2 = await tester.startGesture(const Offset(500, 300));
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await tester.pump();
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await g1.moveTo(const Offset(100, 300)); // dist 400 → 2×, clamped to (0,0)
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await tester.pump();
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await g2.moveTo(const Offset(700, 300)); // dist 600 → 3×, anchored at (-50,-150)
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await tester.pump();
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final ctrl = _controller(tester);
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expect(ctrl.scale, closeTo(3.0, 1e-6));
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expect(ctrl.position, const Offset(-50, -150));
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await g1.moveBy(const Offset(50, 0)); // focal pan, distance unchanged
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await g2.moveBy(const Offset(50, 0));
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await tester.pump();
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expect(ctrl.position.dx, closeTo(0, 0.01));
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expect(ctrl.position.dy, closeTo(-150, 0.01));
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await g1.up();
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await g2.up();
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await tester.pump(const Duration(milliseconds: 350)); // flush double-tap countdown
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});
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testWidgets('per-page zoom state survives page switches', (tester) async {
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var page = 0;
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await tester.pumpWidget(_harness(onPageChanged: (i) => page = i));
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await _pinchOut(tester, 600); // page 0 zoomed to 3×
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await _slowDrag(tester, const Offset(700, 300), const Offset(-250, 0)); // pan to X clamp
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await _slowDrag(tester, const Offset(700, 300), const Offset(-500, 0)); // released at edge → page 1
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expect(page, 1);
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await _slowDrag(tester, const Offset(100, 300), const Offset(500, 0)); // page 0
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expect(page, 0);
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final ctrl = _controller(tester);
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expect(ctrl.scale, 3.0); // still zoomed
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expect(ctrl.position, const Offset(-200, -150)); // still clamped
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});
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testWidgets('pages without LeafZoomable dismiss and page but never pop', (tester) async {
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var dismissed = false;
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var outside = 0;
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var page = 0;
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await tester.pumpWidget(_harness(
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pageBuilder: (context, i) => Center(child: Text('page $i')),
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onDismissed: () => dismissed = true,
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onTapOutside: () => outside++,
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onPageChanged: (i) => page = i,
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));
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await tester.tapAt(const Offset(10, 10));
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await tester.pump(const Duration(milliseconds: 350));
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expect(outside, 0);
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await _slowDrag(tester, const Offset(700, 300), const Offset(-500, 0));
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expect(page, 1);
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await tester.timedDrag(find.byType(LeafViewer), const Offset(0, 400), const Duration(milliseconds: 200));
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await tester.pumpAndSettle();
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expect(dismissed, isTrue);
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});
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group('desktop mode', () {
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testWidgets('mouse drag at 1× neither pages nor dismisses', (tester) async {
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debugDefaultTargetPlatformOverride = TargetPlatform.windows;
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var page = 0;
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var dismissed = false;
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await tester.pumpWidget(_harness(onPageChanged: (i) => page = i, onDismissed: () => dismissed = true));
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final g = await tester.startGesture(const Offset(600, 300), kind: PointerDeviceKind.mouse);
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await tester.pump();
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for (var i = 0; i < 8; i++) {
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await g.moveBy(const Offset(-62.5, 0));
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await tester.pump(const Duration(milliseconds: 50));
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}
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await g.up();
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await tester.pump(const Duration(milliseconds: 350));
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expect(page, 0);
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final g2 = await tester.startGesture(const Offset(400, 200), kind: PointerDeviceKind.mouse);
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await tester.pump();
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for (var i = 0; i < 8; i++) {
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await g2.moveBy(const Offset(0, 37.5));
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await tester.pump(const Duration(milliseconds: 25));
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}
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await g2.up();
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await tester.pump(const Duration(milliseconds: 350));
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expect(dismissed, isFalse);
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debugDefaultTargetPlatformOverride = null;
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});
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testWidgets('double-tap does nothing on desktop', (tester) async {
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debugDefaultTargetPlatformOverride = TargetPlatform.windows;
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await tester.pumpWidget(_harness());
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await _doubleTapAt(tester, const Offset(400, 300));
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expect(_controller(tester).scale, 1.0);
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debugDefaultTargetPlatformOverride = null;
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});
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testWidgets('zoomed mouse drag pans', (tester) async {
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debugDefaultTargetPlatformOverride = TargetPlatform.windows;
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await tester.pumpWidget(_harness());
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await _pinchOut(tester, 600); // 3× via touch pinch
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final ctrl = _controller(tester);
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final g = await tester.startGesture(const Offset(700, 300), kind: PointerDeviceKind.mouse);
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await tester.pump();
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for (var i = 0; i < 8; i++) {
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await g.moveBy(const Offset(-18.75, 0));
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await tester.pump(const Duration(milliseconds: 50));
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}
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await g.up();
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await tester.pump(const Duration(milliseconds: 350));
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expect(ctrl.position.dx, lessThan(0));
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debugDefaultTargetPlatformOverride = null;
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});
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testWidgets('default controls show on desktop and page via buttons', (tester) async {
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debugDefaultTargetPlatformOverride = TargetPlatform.windows;
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var page = 0;
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await tester.pumpWidget(_harness(onPageChanged: (i) => page = i));
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expect(find.byIcon(Icons.chevron_right), findsOneWidget);
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expect(find.byIcon(Icons.chevron_left), findsOneWidget);
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expect(find.byIcon(Icons.close), findsOneWidget);
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expect(find.text('1 / 3'), findsOneWidget);
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await tester.tap(find.byIcon(Icons.chevron_right));
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await tester.pumpAndSettle();
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expect(page, 1);
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expect(find.text('2 / 3'), findsOneWidget);
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await tester.tap(find.byIcon(Icons.chevron_left));
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await tester.pumpAndSettle();
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expect(page, 0);
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debugDefaultTargetPlatformOverride = null;
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});
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testWidgets('custom controlsBuilder replaces the default', (tester) async {
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debugDefaultTargetPlatformOverride = TargetPlatform.windows;
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await tester.pumpWidget(MaterialApp(
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home: Scaffold(
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body: LeafViewer(
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pageCount: 3,
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pageBuilder: _zoomablePage,
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controlsBuilder: (context, controls) => Text('custom ${controls.currentIndex}'),
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),
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),
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));
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expect(find.text('custom 0'), findsOneWidget);
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expect(find.byIcon(Icons.chevron_right), findsNothing);
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debugDefaultTargetPlatformOverride = null;
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});
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testWidgets('close button pops the route', (tester) async {
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debugDefaultTargetPlatformOverride = TargetPlatform.windows;
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await tester.pumpWidget(MaterialApp(
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home: Builder(
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builder: (context) => Center(
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child: ElevatedButton(
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onPressed: () => Navigator.of(context).push(MaterialPageRoute(
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builder: (_) => Scaffold(body: LeafViewer(pageCount: 3, pageBuilder: _zoomablePage)),
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)),
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child: const Text('open'),
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),
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),
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),
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));
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await tester.tap(find.text('open'));
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await tester.pump();
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await tester.pump(const Duration(milliseconds: 400));
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expect(find.byType(LeafViewer), findsOneWidget);
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await tester.tap(find.byIcon(Icons.close));
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await tester.pump();
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await tester.pump(const Duration(milliseconds: 600));
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expect(find.byType(LeafViewer), findsNothing);
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debugDefaultTargetPlatformOverride = null;
|
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});
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testWidgets('paging via buttons does not rebuild pages (no black flash)', (tester) async {
|
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debugDefaultTargetPlatformOverride = TargetPlatform.windows;
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final counts = <int, int>{};
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await tester.pumpWidget(MaterialApp(
|
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home: Scaffold(
|
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body: LeafViewer(
|
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pageCount: 3,
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pageBuilder: (context, i) {
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counts[i] = (counts[i] ?? 0) + 1;
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return _zoomablePage(context, i);
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},
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),
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),
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));
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expect(counts[0], 1);
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await tester.tap(find.byIcon(Icons.chevron_right));
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await tester.pumpAndSettle();
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expect(find.text('2 / 3'), findsOneWidget);
|
||||
expect(counts[0], 1); // existing pages are never re-invoked
|
||||
debugDefaultTargetPlatformOverride = null;
|
||||
});
|
||||
|
||||
testWidgets('enableSwipeGestures: true emulates touch on desktop', (tester) async {
|
||||
debugDefaultTargetPlatformOverride = TargetPlatform.windows;
|
||||
var page = 0;
|
||||
var dismissed = false;
|
||||
await tester.pumpWidget(_harness(
|
||||
enableSwipeGestures: true,
|
||||
onPageChanged: (i) => page = i,
|
||||
onDismissed: () => dismissed = true,
|
||||
));
|
||||
final g = await tester.startGesture(const Offset(600, 300), kind: PointerDeviceKind.mouse);
|
||||
await tester.pump();
|
||||
for (var i = 0; i < 8; i++) {
|
||||
await g.moveBy(const Offset(-62.5, 0));
|
||||
await tester.pump(const Duration(milliseconds: 50));
|
||||
}
|
||||
await g.up();
|
||||
await tester.pumpAndSettle();
|
||||
expect(page, 1); // mouse swipe pages
|
||||
await tester.timedDrag(find.byType(LeafViewer), const Offset(0, 400), const Duration(milliseconds: 200));
|
||||
await tester.pumpAndSettle();
|
||||
expect(dismissed, isTrue); // mouse drag dismisses
|
||||
debugDefaultTargetPlatformOverride = null;
|
||||
});
|
||||
|
||||
testWidgets('enableSwipeGestures: true enables double-tap on desktop', (tester) async {
|
||||
debugDefaultTargetPlatformOverride = TargetPlatform.windows;
|
||||
await tester.pumpWidget(_harness(enableSwipeGestures: true));
|
||||
await _doubleTapAt(tester, const Offset(400, 300));
|
||||
expect(_controller(tester).scale, greaterThan(1.0));
|
||||
debugDefaultTargetPlatformOverride = null;
|
||||
});
|
||||
|
||||
testWidgets('enableSwipeGestures: false disables touch gestures on touch platforms', (tester) async {
|
||||
var dismissed = false;
|
||||
await tester.pumpWidget(_harness(enableSwipeGestures: false, onDismissed: () => dismissed = true));
|
||||
await tester.timedDrag(find.byType(LeafViewer), const Offset(0, 400), const Duration(milliseconds: 200));
|
||||
await tester.pumpAndSettle();
|
||||
expect(dismissed, isFalse);
|
||||
await _doubleTapAt(tester, const Offset(400, 300));
|
||||
expect(_controller(tester).scale, 1.0);
|
||||
});
|
||||
|
||||
testWidgets('dismiss without onDismissed pops the route', (tester) async {
|
||||
debugDefaultTargetPlatformOverride = TargetPlatform.windows;
|
||||
await tester.pumpWidget(MaterialApp(
|
||||
home: Builder(
|
||||
builder: (context) => Center(
|
||||
child: ElevatedButton(
|
||||
onPressed: () => Navigator.of(context).push(MaterialPageRoute(
|
||||
builder: (_) => Scaffold(
|
||||
body: LeafViewer(pageCount: 3, pageBuilder: _zoomablePage, enableSwipeGestures: true),
|
||||
),
|
||||
)),
|
||||
child: const Text('open'),
|
||||
),
|
||||
),
|
||||
),
|
||||
));
|
||||
await tester.tap(find.text('open'));
|
||||
await tester.pump();
|
||||
await tester.pump(const Duration(milliseconds: 400));
|
||||
await tester.timedDrag(find.byType(LeafViewer), const Offset(0, 400), const Duration(milliseconds: 200));
|
||||
await tester.pumpAndSettle();
|
||||
expect(find.byType(LeafViewer), findsNothing);
|
||||
debugDefaultTargetPlatformOverride = null;
|
||||
});
|
||||
});
|
||||
}
|
||||
Reference in new issue
Block a user