packages/flutter/test/material/material_state_property_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() {
  test('MaterialStateProperty.resolveWith()', () {
    final MaterialStateProperty<MaterialState> value = MaterialStateProperty.resolveWith<MaterialState>(
      (Set<MaterialState> states) => states.first,
    );
    expect(value.resolve(<MaterialState>{MaterialState.hovered}), MaterialState.hovered);
    expect(value.resolve(<MaterialState>{MaterialState.focused}), MaterialState.focused);
    expect(value.resolve(<MaterialState>{MaterialState.pressed}), MaterialState.pressed);
    expect(value.resolve(<MaterialState>{MaterialState.dragged}), MaterialState.dragged);
    expect(value.resolve(<MaterialState>{MaterialState.selected}), MaterialState.selected);
    expect(value.resolve(<MaterialState>{MaterialState.disabled}), MaterialState.disabled);
    expect(value.resolve(<MaterialState>{MaterialState.error}), MaterialState.error);
  });

  test('MaterialStateProperty.all()', () {
    final MaterialStateProperty<int> value = MaterialStateProperty.all<int>(123);
    expect(value.resolve(<MaterialState>{MaterialState.hovered}), 123);
    expect(value.resolve(<MaterialState>{MaterialState.focused}), 123);
    expect(value.resolve(<MaterialState>{MaterialState.pressed}), 123);
    expect(value.resolve(<MaterialState>{MaterialState.dragged}), 123);
    expect(value.resolve(<MaterialState>{MaterialState.selected}), 123);
    expect(value.resolve(<MaterialState>{MaterialState.disabled}), 123);
    expect(value.resolve(<MaterialState>{MaterialState.error}), 123);
  });

  test('MaterialStatePropertyAll', () {
    const MaterialStatePropertyAll<int> value = MaterialStatePropertyAll<int>(123);
    expect(value.resolve(<MaterialState>{}), 123);
    expect(value.resolve(<MaterialState>{MaterialState.hovered}), 123);
    expect(value.resolve(<MaterialState>{MaterialState.focused}), 123);
    expect(value.resolve(<MaterialState>{MaterialState.pressed}), 123);
    expect(value.resolve(<MaterialState>{MaterialState.dragged}), 123);
    expect(value.resolve(<MaterialState>{MaterialState.selected}), 123);
    expect(value.resolve(<MaterialState>{MaterialState.disabled}), 123);
    expect(value.resolve(<MaterialState>{MaterialState.error}), 123);
  });

  test('toString formats correctly', () {
    const MaterialStateProperty<Color?> colorProperty = MaterialStatePropertyAll<Color?>(Color(0xFFFFFFFF));
    expect(colorProperty.toString(), equals('MaterialStatePropertyAll(Color(0xffffffff))'));

    const MaterialStateProperty<double?> doubleProperty = MaterialStatePropertyAll<double?>(33 + 1/3);
    expect(doubleProperty.toString(), equals('MaterialStatePropertyAll(33.3)'));
  });

  test("Can interpolate between two MaterialStateProperty's", () {
    const MaterialStateProperty<TextStyle?> textStyle1 =  MaterialStatePropertyAll<TextStyle?>(
      TextStyle(fontSize: 14.0),
    );
    const MaterialStateProperty<TextStyle?> textStyle2 = MaterialStatePropertyAll<TextStyle?>(
      TextStyle(fontSize: 20.0),
    );

    // Using `0.0` interpolation value.
    TextStyle textStyle = MaterialStateProperty.lerp<TextStyle?>(
      textStyle1,
      textStyle2,
      0.0,
      TextStyle.lerp,
    )!.resolve(enabled)!;
    expect(textStyle.fontSize, 14.0);

    // Using `0.5` interpolation value.
    textStyle = MaterialStateProperty.lerp<TextStyle?>(
      textStyle1,
      textStyle2,
      0.5,
      TextStyle.lerp,
    )!.resolve(enabled)!;
    expect(textStyle.fontSize, 17.0);

    // Using `1.0` interpolation value.
    textStyle = MaterialStateProperty.lerp<TextStyle?>(
      textStyle1,
      textStyle2,
      1.0,
      TextStyle.lerp,
    )!.resolve(enabled)!;
    expect(textStyle.fontSize, 20.0);
  });
}

Set<MaterialState> enabled = <MaterialState>{};