packages/flutter/test/widgets/drag_boundary_test.dart

// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

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

void main() {
  testWidgets('test DragBoundary with useGlobalPosition', (WidgetTester tester) async {
    final GlobalKey key = GlobalKey();
    await tester.pumpWidget(
      Container(
        margin: const EdgeInsets.only(top: 100, left: 100),
        alignment: Alignment.topLeft,
        child: DragBoundary(child: SizedBox(key: key, width: 100, height: 100)),
      ),
    );
    final DragBoundaryDelegate<Rect> boundary = DragBoundary.forRectOf(key.currentContext!);
    expect(boundary, isNotNull);
    expect(boundary.isWithinBoundary(const Rect.fromLTWH(50, 50, 20, 20)), isFalse);
    expect(boundary.isWithinBoundary(const Rect.fromLTWH(100, 100, 20, 20)), isTrue);
    expect(
      boundary.nearestPositionWithinBoundary(const Rect.fromLTWH(50, 50, 20, 20)),
      const Rect.fromLTWH(100, 100, 20, 20),
    );
    expect(
      boundary.nearestPositionWithinBoundary(const Rect.fromLTWH(150, 150, 20, 20)),
      const Rect.fromLTWH(150, 150, 20, 20),
    );
  });

  testWidgets('test DragBoundary without useGlobalPosition', (WidgetTester tester) async {
    final GlobalKey key = GlobalKey();
    await tester.pumpWidget(
      Container(
        margin: const EdgeInsets.only(top: 100, left: 100),
        alignment: Alignment.topLeft,
        child: DragBoundary(child: SizedBox(key: key, width: 100, height: 100)),
      ),
    );
    final DragBoundaryDelegate<Rect> boundary = DragBoundary.forRectOf(
      key.currentContext!,
      useGlobalPosition: false,
    );
    expect(boundary, isNotNull);
    expect(boundary.isWithinBoundary(const Rect.fromLTWH(50, 50, 20, 20)), isTrue);
    expect(boundary.isWithinBoundary(const Rect.fromLTWH(90, 90, 20, 20)), isFalse);
    expect(
      boundary.nearestPositionWithinBoundary(const Rect.fromLTWH(50, 50, 20, 20)),
      const Rect.fromLTWH(50, 50, 20, 20),
    );
    expect(
      boundary.nearestPositionWithinBoundary(const Rect.fromLTWH(90, 90, 20, 20)),
      const Rect.fromLTWH(80, 80, 20, 20),
    );
  });

  testWidgets('forRectOf should return a free boundary when no ancestor has a DragBoundary', (
    WidgetTester tester,
  ) async {
    final GlobalKey key = GlobalKey();
    await tester.pumpWidget(
      Container(
        margin: const EdgeInsets.only(top: 100, left: 100),
        alignment: Alignment.topLeft,
        child: SizedBox(key: key, width: 100, height: 100),
      ),
    );
    final DragBoundaryDelegate<Rect> boundary = DragBoundary.forRectOf(key.currentContext!);
    expect(boundary, isNotNull);
    expect(boundary.isWithinBoundary(const Rect.fromLTWH(50, 50, 20, 20)), isTrue);
    expect(boundary.isWithinBoundary(const Rect.fromLTWH(100, 100, 20, 20)), isTrue);
    expect(boundary.isWithinBoundary(const Rect.fromLTWH(300, 300, 300, 300)), isTrue);
    expect(
      boundary.nearestPositionWithinBoundary(const Rect.fromLTWH(50, 50, 20, 20)),
      const Rect.fromLTWH(50, 50, 20, 20),
    );
    expect(
      boundary.nearestPositionWithinBoundary(const Rect.fromLTWH(150, 150, 20, 20)),
      const Rect.fromLTWH(150, 150, 20, 20),
    );
    expect(
      boundary.nearestPositionWithinBoundary(const Rect.fromLTWH(300, 300, 300, 300)),
      const Rect.fromLTWH(300, 300, 300, 300),
    );
  });
}