transform_test.dart

// Copyright 2015 The Chromium 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_test/flutter_test.dart';
import 'package:flutter/widgets.dart';
import 'package:test/test.dart';

void main() {
  test('Transform origin', () {
    testWidgets((WidgetTester tester) {
      bool didReceiveTap = false;
      tester.pumpWidget(
        new Stack(
          children: <Widget>[
            new Positioned(
              top: 100.0,
              left: 100.0,
              child: new Container(
                width: 100.0,
                height: 100.0,
                decoration: new BoxDecoration(
                  backgroundColor: new Color(0xFF0000FF)
                )
              )
            ),
            new Positioned(
              top: 100.0,
              left: 100.0,
              child: new Container(
                width: 100.0,
                height: 100.0,
                child: new Transform(
                  transform: new Matrix4.identity().scale(0.5, 0.5),
                  origin: new Offset(100.0, 50.0),
                  child: new GestureDetector(
                    onTap: () {
                      didReceiveTap = true;
                    },
                    child: new Container(
                      decoration: new BoxDecoration(
                        backgroundColor: new Color(0xFF00FFFF)
                      )
                    )
                  )
                )
              )
            )
          ]
        )
      );

      expect(didReceiveTap, isFalse);
      tester.tapAt(new Point(110.0, 110.0));
      expect(didReceiveTap, isFalse);
      tester.tapAt(new Point(190.0, 150.0));
      expect(didReceiveTap, isTrue);
    });
  });

  test('Transform alignment', () {
    testWidgets((WidgetTester tester) {
      bool didReceiveTap = false;
      tester.pumpWidget(
        new Stack(
          children: <Widget>[
            new Positioned(
              top: 100.0,
              left: 100.0,
              child: new Container(
                width: 100.0,
                height: 100.0,
                decoration: new BoxDecoration(
                  backgroundColor: new Color(0xFF0000FF)
                )
              )
            ),
            new Positioned(
              top: 100.0,
              left: 100.0,
              child: new Container(
                width: 100.0,
                height: 100.0,
                child: new Transform(
                  transform: new Matrix4.identity().scale(0.5, 0.5),
                  alignment: new FractionalOffset(1.0, 0.5),
                  child: new GestureDetector(
                    onTap: () {
                      didReceiveTap = true;
                    },
                    child: new Container(
                      decoration: new BoxDecoration(
                        backgroundColor: new Color(0xFF00FFFF)
                      )
                    )
                  )
                )
              )
            )
          ]
        )
      );

      expect(didReceiveTap, isFalse);
      tester.tapAt(new Point(110.0, 110.0));
      expect(didReceiveTap, isFalse);
      tester.tapAt(new Point(190.0, 150.0));
      expect(didReceiveTap, isTrue);
    });
  });

  test('Transform offset + alignment', () {
    testWidgets((WidgetTester tester) {
      bool didReceiveTap = false;
      tester.pumpWidget(
        new Stack(
          children: <Widget>[
            new Positioned(
              top: 100.0,
              left: 100.0,
              child: new Container(
                width: 100.0,
                height: 100.0,
                decoration: new BoxDecoration(
                  backgroundColor: new Color(0xFF0000FF)
                )
              )
            ),
            new Positioned(
              top: 100.0,
              left: 100.0,
              child: new Container(
                width: 100.0,
                height: 100.0,
                child: new Transform(
                  transform: new Matrix4.identity().scale(0.5, 0.5),
                  origin: new Offset(100.0, 0.0),
                  alignment: new FractionalOffset(0.0, 0.5),
                  child: new GestureDetector(
                    onTap: () {
                      didReceiveTap = true;
                    },
                    child: new Container(
                      decoration: new BoxDecoration(
                        backgroundColor: new Color(0xFF00FFFF)
                      )
                    )
                  )
                )
              )
            )
          ]
        )
      );

      expect(didReceiveTap, isFalse);
      tester.tapAt(new Point(110.0, 110.0));
      expect(didReceiveTap, isFalse);
      tester.tapAt(new Point(190.0, 150.0));
      expect(didReceiveTap, isTrue);
    });
  });
}