• Anthony's avatar
    [Material] Update slider and slider theme with new sizes, shapes, and color... · 96f15c74
    Anthony authored
    [Material] Update slider and slider theme with new sizes, shapes, and color mappings (2nd attempt) (#31564)
    
    #30390 was rolled back. This PR will re-roll it forward.
    
    This PR makes a number of changes to the visual appearance of material sliders:
    
    Sizes/Shapes
    ** enabled thumb radius from 6 to 10
    ** disabled thumb radius from 4 to 10 with no gap
    ** default track shape is a rounded rect rather than a rect
    **
    Colors
    ** all of the colors now use the new color scheme
    ** overlay opacity has been reduce from 16% to 12%
    ** value indicator text color now respects the indicator it is on by using onPrimary
    ** disabledThumb color no respects the surface it is on by using onSurface
    The slider theme is also now constructed consistently with other theme objects within the ThemeData. By default, all values are null, and have default values that are resolved in the slider itself, rather than in the slider theme.
    96f15c74
slider_theme_test.dart 26.9 KB
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// Copyright 2018 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 'dart:ui' show window;

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

import '../rendering/mock_canvas.dart';

void main() {
  testWidgets('Slider uses ThemeData slider theme if present', (WidgetTester tester) async {
    final ThemeData theme = ThemeData(
      platform: TargetPlatform.android,
      primarySwatch: Colors.red,
    );
    final SliderThemeData sliderTheme = theme.sliderTheme;

    await tester.pumpWidget(_buildApp(sliderTheme, value: 0.5, enabled: false));
    final RenderBox sliderBox = tester.firstRenderObject<RenderBox>(find.byType(Slider));

    expect(
      sliderBox,
      paints
        ..rect(color: sliderTheme.disabledActiveTrackColor)
        ..rect(color: sliderTheme.disabledInactiveTrackColor),
    );
  });

  testWidgets('Slider overrides ThemeData theme if SliderTheme present', (WidgetTester tester) async {
    final ThemeData theme = ThemeData(
      platform: TargetPlatform.android,
      primarySwatch: Colors.red,
    );
    final SliderThemeData sliderTheme = theme.sliderTheme;
    final SliderThemeData customTheme = sliderTheme.copyWith(
      activeTrackColor: Colors.purple,
      inactiveTrackColor: Colors.purple.withAlpha(0x3d),
    );

    await tester.pumpWidget(_buildApp(sliderTheme, value: 0.5, enabled: false));
    final RenderBox sliderBox = tester.firstRenderObject<RenderBox>(find.byType(Slider));

    expect(
      sliderBox,
      paints
        ..rect(color: customTheme.disabledActiveTrackColor)
        ..rect(color: customTheme.disabledInactiveTrackColor),
    );
  });

  testWidgets('SliderThemeData generates correct opacities for fromPrimaryColors', (WidgetTester tester) async {
    const Color customColor1 = Color(0xcafefeed);
    const Color customColor2 = Color(0xdeadbeef);
    const Color customColor3 = Color(0xdecaface);
    const Color customColor4 = Color(0xfeedcafe);

    final SliderThemeData sliderTheme = SliderThemeData.fromPrimaryColors(
      primaryColor: customColor1,
      primaryColorDark: customColor2,
      primaryColorLight: customColor3,
      valueIndicatorTextStyle: ThemeData.fallback().accentTextTheme.body2.copyWith(color: customColor4),
    );

    expect(sliderTheme.activeTrackColor, equals(customColor1.withAlpha(0xff)));
    expect(sliderTheme.inactiveTrackColor, equals(customColor1.withAlpha(0x3d)));
    expect(sliderTheme.disabledActiveTrackColor, equals(customColor2.withAlpha(0x52)));
    expect(sliderTheme.disabledInactiveTrackColor, equals(customColor2.withAlpha(0x1f)));
    expect(sliderTheme.activeTickMarkColor, equals(customColor3.withAlpha(0x8a)));
    expect(sliderTheme.inactiveTickMarkColor, equals(customColor1.withAlpha(0x8a)));
    expect(sliderTheme.disabledActiveTickMarkColor, equals(customColor3.withAlpha(0x1f)));
    expect(sliderTheme.disabledInactiveTickMarkColor, equals(customColor2.withAlpha(0x1f)));
    expect(sliderTheme.thumbColor, equals(customColor1.withAlpha(0xff)));
    expect(sliderTheme.disabledThumbColor, equals(customColor2.withAlpha(0x52)));
    expect(sliderTheme.overlayColor, equals(customColor1.withAlpha(0x1f)));
    expect(sliderTheme.valueIndicatorColor, equals(customColor1.withAlpha(0xff)));
    expect(sliderTheme.valueIndicatorTextStyle.color, equals(customColor4));
  });

  testWidgets('SliderThemeData lerps correctly', (WidgetTester tester) async {
    final SliderThemeData sliderThemeBlack = SliderThemeData.fromPrimaryColors(
      primaryColor: Colors.black,
      primaryColorDark: Colors.black,
      primaryColorLight: Colors.black,
      valueIndicatorTextStyle: ThemeData.fallback().accentTextTheme.body2.copyWith(color: Colors.black),
    ).copyWith(trackHeight: 2.0);
    final SliderThemeData sliderThemeWhite = SliderThemeData.fromPrimaryColors(
      primaryColor: Colors.white,
      primaryColorDark: Colors.white,
      primaryColorLight: Colors.white,
      valueIndicatorTextStyle: ThemeData.fallback().accentTextTheme.body2.copyWith(color: Colors.white),
    ).copyWith(trackHeight: 6.0);
    final SliderThemeData lerp = SliderThemeData.lerp(sliderThemeBlack, sliderThemeWhite, 0.5);
    const Color middleGrey = Color(0xff7f7f7f);

    expect(lerp.trackHeight, equals(4.0));
    expect(lerp.activeTrackColor, equals(middleGrey.withAlpha(0xff)));
    expect(lerp.inactiveTrackColor, equals(middleGrey.withAlpha(0x3d)));
    expect(lerp.disabledActiveTrackColor, equals(middleGrey.withAlpha(0x52)));
    expect(lerp.disabledInactiveTrackColor, equals(middleGrey.withAlpha(0x1f)));
    expect(lerp.activeTickMarkColor, equals(middleGrey.withAlpha(0x8a)));
    expect(lerp.inactiveTickMarkColor, equals(middleGrey.withAlpha(0x8a)));
    expect(lerp.disabledActiveTickMarkColor, equals(middleGrey.withAlpha(0x1f)));
    expect(lerp.disabledInactiveTickMarkColor, equals(middleGrey.withAlpha(0x1f)));
    expect(lerp.thumbColor, equals(middleGrey.withAlpha(0xff)));
    expect(lerp.disabledThumbColor, equals(middleGrey.withAlpha(0x52)));
    expect(lerp.overlayColor, equals(middleGrey.withAlpha(0x1f)));
    expect(lerp.valueIndicatorColor, equals(middleGrey.withAlpha(0xff)));
    expect(lerp.valueIndicatorTextStyle.color, equals(middleGrey.withAlpha(0xff)));
  });

  testWidgets('Default slider track draws correctly', (WidgetTester tester) async {
    final ThemeData theme = ThemeData(
      platform: TargetPlatform.android,
      primarySwatch: Colors.blue,
    );
    final SliderThemeData sliderTheme = theme.sliderTheme.copyWith(thumbColor: Colors.red.shade500);

    await tester.pumpWidget(_buildApp(sliderTheme, value: 0.25));
    final RenderBox sliderBox = tester.firstRenderObject<RenderBox>(find.byType(Slider));

    // The enabled slider thumb has track segments that extend to and from
    // the center of the thumb.
    expect(
      sliderBox,
      paints
        ..rect(rect: Rect.fromLTRB(25.0, 299.0, 202.0, 301.0), color: sliderTheme.activeTrackColor)
        ..rect(rect: Rect.fromLTRB(222.0, 299.0, 776.0, 301.0), color: sliderTheme.inactiveTrackColor),
    );

    await tester.pumpWidget(_buildApp(sliderTheme, value: 0.25, enabled: false));
    await tester.pumpAndSettle(); // wait for disable animation

    // The disabled slider thumb has a horizontal gap between itself and the
    // track segments. Therefore, the track segments are shorter since they do
    // not extend to the center of the thumb, but rather the outer edge of th
    // gap. As a result, the `right` value of the first segment is less than it
    // is above, and the `left` value of the second segment is more than it is
    // above.
    expect(
      sliderBox,
      paints
        ..rect(rect: Rect.fromLTRB(25.0, 299.0, 202.0, 301.0), color: sliderTheme.disabledActiveTrackColor)
        ..rect(rect: Rect.fromLTRB(222.0, 299.0, 776.0, 301.0), color: sliderTheme.disabledInactiveTrackColor),
    );
  });

  testWidgets('Default slider overlay draws correctly', (WidgetTester tester) async {
    final ThemeData theme = ThemeData(
      platform: TargetPlatform.android,
      primarySwatch: Colors.blue,
    );
    final SliderThemeData sliderTheme = theme.sliderTheme.copyWith(thumbColor: Colors.red.shade500);

    await tester.pumpWidget(_buildApp(sliderTheme, value: 0.25));
    final RenderBox sliderBox = tester.firstRenderObject<RenderBox>(find.byType(Slider));

    // With no touch, paints only the thumb.
    expect(
      sliderBox,
      paints
        ..circle(
          color: sliderTheme.thumbColor,
          x: 212.0,
          y: 300.0,
          radius: 10.0,
        ),
    );

    final Offset center = tester.getCenter(find.byType(Slider));
    final TestGesture gesture = await tester.startGesture(center);
    // Wait for overlay animation to finish.
    await tester.pumpAndSettle();

    // After touch, paints thumb and overlay.
    expect(
      sliderBox,
      paints
        ..circle(
          color: sliderTheme.overlayColor,
          x: 212.0,
          y: 300.0,
          radius: 24.0,
        )
        ..circle(
          color: sliderTheme.thumbColor,
          x: 212.0,
          y: 300.0,
          radius: 10.0,
        ),
    );

    await gesture.up();
    await tester.pumpAndSettle();

    // After the gesture is up and complete, it again paints only the thumb.
    expect(
      sliderBox,
      paints
        ..circle(
          color: sliderTheme.thumbColor,
          x: 212.0,
          y: 300.0,
          radius: 10.0,
        ),
    );
  });

  testWidgets('Default slider ticker and thumb shape draw correctly', (WidgetTester tester) async {
    final ThemeData theme = ThemeData(
      platform: TargetPlatform.android,
      primarySwatch: Colors.blue,
    );
    final SliderThemeData sliderTheme = theme.sliderTheme.copyWith(thumbColor: Colors.red.shade500);

    await tester.pumpWidget(_buildApp(sliderTheme, value: 0.45));
    final RenderBox sliderBox = tester.firstRenderObject<RenderBox>(find.byType(Slider));

    expect(sliderBox, paints..circle(color: sliderTheme.thumbColor, radius: 10.0));

    await tester.pumpWidget(_buildApp(sliderTheme, value: 0.45, enabled: false));
    await tester.pumpAndSettle(); // wait for disable animation

    expect(sliderBox, paints..circle(color: sliderTheme.disabledThumbColor, radius: 10.0));

    await tester.pumpWidget(_buildApp(sliderTheme, value: 0.45, divisions: 3));
    await tester.pumpAndSettle(); // wait for enable animation

    expect(
      sliderBox,
      paints
        ..circle(color: sliderTheme.activeTickMarkColor)
        ..circle(color: sliderTheme.activeTickMarkColor)
        ..circle(color: sliderTheme.inactiveTickMarkColor)
        ..circle(color: sliderTheme.inactiveTickMarkColor)
        ..circle(color: sliderTheme.thumbColor, radius: 10.0),
    );

    await tester.pumpWidget(_buildApp(sliderTheme, value: 0.45, divisions: 3, enabled: false));
    await tester.pumpAndSettle(); // wait for disable animation

    expect(
      sliderBox,
      paints
        ..circle(color: sliderTheme.disabledActiveTickMarkColor)
        ..circle(color: sliderTheme.disabledInactiveTickMarkColor)
        ..circle(color: sliderTheme.disabledInactiveTickMarkColor)
        ..circle(color: sliderTheme.disabledInactiveTickMarkColor)
        ..circle(color: sliderTheme.disabledThumbColor, radius: 10.0),
    );
  });

  testWidgets('Default slider value indicator shape draws correctly', (WidgetTester tester) async {
    final ThemeData theme = ThemeData(
      platform: TargetPlatform.android,
      primarySwatch: Colors.blue,
    );
    final SliderThemeData sliderTheme = theme.sliderTheme.copyWith(thumbColor: Colors.red.shade500, showValueIndicator: ShowValueIndicator.always);
    Widget buildApp(String value, { double sliderValue = 0.5, double textScale = 1.0 }) {
      return Directionality(
        textDirection: TextDirection.ltr,
        child: MediaQuery(
          data: MediaQueryData.fromWindow(window).copyWith(textScaleFactor: textScale),
          child: Material(
            child: Row(
              children: <Widget>[
                Expanded(
                  child: SliderTheme(
                    data: sliderTheme,
                    child: Slider(
                      value: sliderValue,
                      label: '$value',
                      divisions: 3,
                      onChanged: (double d) { },
                    ),
                  ),
                ),
              ],
            ),
          ),
        ),
      );
    }

    await tester.pumpWidget(buildApp('1'));

    final RenderBox sliderBox = tester.firstRenderObject<RenderBox>(find.byType(Slider));

    Offset center = tester.getCenter(find.byType(Slider));
    TestGesture gesture = await tester.startGesture(center);
    // Wait for value indicator animation to finish.
    await tester.pumpAndSettle();
    expect(
      sliderBox,
      paints
        ..path(
          color: sliderTheme.valueIndicatorColor,
          includes: <Offset>[
            const Offset(0.0, -40.0),
            const Offset(15.9, -40.0),
            const Offset(-15.9, -40.0),
          ],
          excludes: <Offset>[const Offset(16.1, -40.0), const Offset(-16.1, -40.0)],
        ),
    );

    await gesture.up();

    // Test that it expands with a larger label.
    await tester.pumpWidget(buildApp('1000'));
    center = tester.getCenter(find.byType(Slider));
    gesture = await tester.startGesture(center);
    // Wait for value indicator animation to finish.
    await tester.pumpAndSettle();
    expect(
      sliderBox,
      paints
        ..path(
          color: sliderTheme.valueIndicatorColor,
          includes: <Offset>[
            const Offset(0.0, -40.0),
            const Offset(35.9, -40.0),
            const Offset(-35.9, -40.0),
          ],
          excludes: <Offset>[const Offset(36.1, -40.0), const Offset(-36.1, -40.0)],
        ),
    );
    await gesture.up();

    // Test that it avoids the left edge of the screen.
    await tester.pumpWidget(buildApp('1000000', sliderValue: 0.0));
    center = tester.getCenter(find.byType(Slider));
    gesture = await tester.startGesture(center);
    // Wait for value indicator animation to finish.
    await tester.pumpAndSettle();
    expect(
      sliderBox,
      paints
        ..path(
          color: sliderTheme.valueIndicatorColor,
          includes: <Offset>[
            const Offset(0.0, -40.0),
            const Offset(92.0, -40.0),
            const Offset(-16.0, -40.0),
          ],
          excludes: <Offset>[const Offset(98.1, -40.0), const Offset(-20.1, -40.0)],
        ),
    );
    await gesture.up();

    // Test that it avoids the right edge of the screen.
    await tester.pumpWidget(buildApp('1000000', sliderValue: 1.0));
    center = tester.getCenter(find.byType(Slider));
    gesture = await tester.startGesture(center);
    // Wait for value indicator animation to finish.
    await tester.pumpAndSettle();
    expect(
      sliderBox,
      paints
        ..path(
          color: sliderTheme.valueIndicatorColor,
          includes: <Offset>[
            const Offset(0.0, -40.0),
            const Offset(16.0, -40.0),
            const Offset(-92.0, -40.0),
          ],
          excludes: <Offset>[const Offset(20.1, -40.0), const Offset(-98.1, -40.0)],
        ),
    );
    await gesture.up();

    // Test that the neck stretches when the text scale gets smaller.
    await tester.pumpWidget(buildApp('1000000', sliderValue: 0.0, textScale: 0.5));
    center = tester.getCenter(find.byType(Slider));
    gesture = await tester.startGesture(center);
    // Wait for value indicator animation to finish.
    await tester.pumpAndSettle();
    expect(
      sliderBox,
      paints
        ..path(
          color: sliderTheme.valueIndicatorColor,
          includes: <Offset>[
            const Offset(0.0, -49.0),
            const Offset(68.0, -49.0),
            const Offset(-24.0, -49.0),
          ],
          excludes: <Offset>[
            const Offset(98.0, -32.0),  // inside full size, outside small
            const Offset(-40.0, -32.0),  // inside full size, outside small
            const Offset(90.1, -49.0),
            const Offset(-40.1, -49.0),
          ],
        ),
    );
    await gesture.up();

    // Test that the neck shrinks when the text scale gets larger.
    await tester.pumpWidget(buildApp('1000000', sliderValue: 0.0, textScale: 2.5));
    center = tester.getCenter(find.byType(Slider));
    gesture = await tester.startGesture(center);
    // Wait for value indicator animation to finish.
    await tester.pumpAndSettle();
    expect(
      sliderBox,
      paints
        ..path(
          color: sliderTheme.valueIndicatorColor,
          includes: <Offset>[
            const Offset(0.0, -38.8),
            const Offset(92.0, -38.8),
            const Offset(8.0, -23.0), // Inside large, outside scale=1.0
            const Offset(-2.0, -23.0), // Inside large, outside scale=1.0
          ],
          excludes: <Offset>[
            const Offset(98.5, -38.8),
            const Offset(-16.1, -38.8),
          ],
        ),
    );
    await gesture.up();
  });

  testWidgets('The slider track height can be overridden', (WidgetTester tester) async {
    final SliderThemeData sliderTheme = ThemeData().sliderTheme.copyWith(trackHeight: 16);

    await tester.pumpWidget(_buildApp(sliderTheme, value: 0.25));

    final RenderBox sliderBox = tester.firstRenderObject<RenderBox>(find.byType(Slider));

    // Top and bottom are centerY (300) + and - trackRadius (8).
    expect(
      sliderBox,
      paints
        ..rect(rect: Rect.fromLTRB(32.0, 292.0, 202.0, 308.0), color: sliderTheme.activeTrackColor)
        ..rect(rect: Rect.fromLTRB(222.0, 292.0, 776.0, 308.0), color: sliderTheme.inactiveTrackColor),
    );

    await tester.pumpWidget(_buildApp(sliderTheme, value: 0.25, enabled: false));
    await tester.pumpAndSettle(); // wait for disable animation

    // The disabled thumb is smaller so the active track has to paint longer to
    // get to the edge.
    expect(
      sliderBox,
      paints
        ..rect(rect: Rect.fromLTRB(32.0, 292.0, 202.0, 308.0), color: sliderTheme.disabledActiveTrackColor)
        ..rect(rect: Rect.fromLTRB(222.0, 292.0, 776.0, 308.0), color: sliderTheme.disabledInactiveTrackColor),
    );
  });

  testWidgets('The default slider thumb shape sizes can be overridden', (WidgetTester tester) async {
    final SliderThemeData sliderTheme = ThemeData().sliderTheme.copyWith(
        thumbShape: const RoundSliderThumbShape(
          enabledThumbRadius: 7,
          disabledThumbRadius: 11,
        ),
    );

    await tester.pumpWidget(_buildApp(sliderTheme, value: 0.25));
    final RenderBox sliderBox = tester.firstRenderObject<RenderBox>(find.byType(Slider));

    expect(
      sliderBox,
      paints..circle(x: 212, y: 300, radius: 7, color: sliderTheme.thumbColor),
    );

    await tester.pumpWidget(_buildApp(sliderTheme, value: 0.25, enabled: false));
    await tester.pumpAndSettle(); // wait for disable animation

    expect(
      sliderBox,
      paints..circle(x: 212, y: 300, radius: 11, color: sliderTheme.disabledThumbColor),
    );
  });

  testWidgets('The default slider thumb shape disabled size can be inferred from the enabled size', (WidgetTester tester) async {
    final SliderThemeData sliderTheme = ThemeData().sliderTheme.copyWith(
      thumbShape: const RoundSliderThumbShape(
        enabledThumbRadius: 9,
      ),
    );

    await tester.pumpWidget(_buildApp(sliderTheme, value: 0.25));
    final RenderBox sliderBox = tester.firstRenderObject<RenderBox>(find.byType(Slider));

    expect(
      sliderBox,
      paints..circle(x: 212, y: 300, radius: 9, color: sliderTheme.thumbColor),
    );

    await tester.pumpWidget(_buildApp(sliderTheme, value: 0.25, enabled: false));
    await tester.pumpAndSettle(); // wait for disable animation
    expect(
      sliderBox,
      paints..circle(x: 212, y: 300, radius: 9, color: sliderTheme.disabledThumbColor),
    );
  });


  testWidgets('The default slider tick mark shape size can be overridden', (WidgetTester tester) async {
    final SliderThemeData sliderTheme = ThemeData().sliderTheme.copyWith(
      tickMarkShape: const RoundSliderTickMarkShape(tickMarkRadius: 5),
      activeTickMarkColor: const Color(0xfadedead),
      inactiveTickMarkColor: const Color(0xfadebeef),
      disabledActiveTickMarkColor: const Color(0xfadecafe),
      disabledInactiveTickMarkColor: const Color(0xfadeface),
    );

    await tester.pumpWidget(_buildApp(sliderTheme, value: 0.5, divisions: 2));

    final RenderBox sliderBox = tester.firstRenderObject<RenderBox>(find.byType(Slider));

    expect(
      sliderBox,
      paints
        ..circle(x: 29, y: 300, radius: 5, color: sliderTheme.activeTickMarkColor)
        ..circle(x: 400, y: 300, radius: 5, color: sliderTheme.activeTickMarkColor)
        ..circle(x: 771, y: 300, radius: 5, color: sliderTheme.inactiveTickMarkColor),
    );

    await tester.pumpWidget(_buildApp(sliderTheme, value: 0.5, divisions: 2,  enabled: false));
    await tester.pumpAndSettle();

    expect(
      sliderBox,
      paints
        ..circle(x: 29, y: 300, radius: 5, color: sliderTheme.disabledActiveTickMarkColor)
        ..circle(x: 400, y: 300, radius: 5, color: sliderTheme.disabledActiveTickMarkColor)
        ..circle(x: 771, y: 300, radius: 5, color: sliderTheme.disabledInactiveTickMarkColor),
    );
  });

  testWidgets('The default slider overlay shape size can be overridden', (WidgetTester tester) async {
    const double uniqueOverlayRadius = 23;
    final SliderThemeData sliderTheme = ThemeData().sliderTheme.copyWith(
      overlayShape: const RoundSliderOverlayShape(
        overlayRadius: uniqueOverlayRadius,
      ),
    );

    await tester.pumpWidget(_buildApp(sliderTheme, value: 0.5));
    // Tap center and wait for animation.
    final Offset center = tester.getCenter(find.byType(Slider));
    await tester.startGesture(center);
    await tester.pumpAndSettle();

    final RenderBox sliderBox = tester.firstRenderObject<RenderBox>(find.byType(Slider));
    expect(
      sliderBox,
      paints..circle(
        x: center.dx,
        y: center.dy,
        radius: uniqueOverlayRadius,
        color: sliderTheme.overlayColor,
      ),
    );
  });

  // Only the thumb, overlay, and tick mark have special shortcuts to provide
  // no-op or empty shapes.
  //
  // The track can also be skipped by providing 0 height.
  //
  // The value indicator can be skipped by passing the appropriate
  // [ShowValueIndicator].
  testWidgets('The slider can skip all of its comoponent painting', (WidgetTester tester) async {
    // Pump a slider with all shapes skipped.
    await tester.pumpWidget(_buildApp(
      ThemeData().sliderTheme.copyWith(
        trackHeight: 0,
        overlayShape: SliderComponentShape.noOverlay,
        thumbShape: SliderComponentShape.noThumb,
        tickMarkShape: SliderTickMarkShape.noTickMark,
        showValueIndicator: ShowValueIndicator.never,
      ),
      value: 0.5,
      divisions: 4,
    ));

    final RenderBox sliderBox = tester.firstRenderObject<RenderBox>(find.byType(Slider));

    expect(sliderBox, paintsNothing);
  });

  testWidgets('The slider can skip all component painting except the track', (WidgetTester tester) async {
    // Pump a slider with just a track.
    await tester.pumpWidget(_buildApp(
      ThemeData().sliderTheme.copyWith(
        overlayShape: SliderComponentShape.noOverlay,
        thumbShape: SliderComponentShape.noThumb,
        tickMarkShape: SliderTickMarkShape.noTickMark,
        showValueIndicator: ShowValueIndicator.never,
      ),
      value: 0.5,
      divisions: 4,
    ));

    final RenderBox sliderBox = tester.firstRenderObject<RenderBox>(find.byType(Slider));

    // Only 2 track segments.
    expect(sliderBox, paintsExactlyCountTimes(#drawRect, 2));
    expect(sliderBox, paintsExactlyCountTimes(#drawCircle, 0));
    expect(sliderBox, paintsExactlyCountTimes(#drawPath, 0));
  });

  testWidgets('The slider can skip all component painting except the tick marks', (WidgetTester tester) async {
    // Pump a slider with just tick marks.
    await tester.pumpWidget(_buildApp(
      ThemeData().sliderTheme.copyWith(
        trackHeight: 0,
        overlayShape: SliderComponentShape.noOverlay,
        thumbShape: SliderComponentShape.noThumb,
        showValueIndicator: ShowValueIndicator.never,
      ),
      value: 0.5,
      divisions: 4,
    ));

    final RenderBox sliderBox = tester.firstRenderObject<RenderBox>(find.byType(Slider));

    // Only 5 tick marks.
    expect(sliderBox, paintsExactlyCountTimes(#drawRect, 0));
    expect(sliderBox, paintsExactlyCountTimes(#drawCircle, 5));
    expect(sliderBox, paintsExactlyCountTimes(#drawPath, 0));
  });

  testWidgets('The slider can skip all component painting except the thumb', (WidgetTester tester) async {
    // Pump a slider with just a thumb.
    await tester.pumpWidget(_buildApp(
      ThemeData().sliderTheme.copyWith(
        trackHeight: 0,
        overlayShape: SliderComponentShape.noOverlay,
        tickMarkShape: SliderTickMarkShape.noTickMark,
        showValueIndicator: ShowValueIndicator.never,
      ),
      value: 0.5,
      divisions: 4,
    ));

    final RenderBox sliderBox = tester.firstRenderObject<RenderBox>(find.byType(Slider));

    // Only 1 thumb.
    expect(sliderBox, paintsExactlyCountTimes(#drawRect, 0));
    expect(sliderBox, paintsExactlyCountTimes(#drawCircle, 1));
    expect(sliderBox, paintsExactlyCountTimes(#drawPath, 0));
  });

  testWidgets('The slider can skip all component painting except the overlay', (WidgetTester tester) async {
    // Pump a slider with just an overlay.
    await tester.pumpWidget(_buildApp(
      ThemeData().sliderTheme.copyWith(
        trackHeight: 0,
        thumbShape: SliderComponentShape.noThumb,
        tickMarkShape: SliderTickMarkShape.noTickMark,
        showValueIndicator: ShowValueIndicator.never,
      ),
      value: 0.5,
      divisions: 4,
    ));

    final RenderBox sliderBox = tester.firstRenderObject<RenderBox>(find.byType(Slider));

    // Tap the center of the track and wait for animations to finish.
    final Offset center = tester.getCenter(find.byType(Slider));
    final TestGesture gesture = await tester.startGesture(center);
    await tester.pumpAndSettle();

    // Only 1 overlay.
    expect(sliderBox, paintsExactlyCountTimes(#drawRect, 0));
    expect(sliderBox, paintsExactlyCountTimes(#drawCircle, 1));
    expect(sliderBox, paintsExactlyCountTimes(#drawPath, 0));

    await gesture.up();
  });

  testWidgets('The slider can skip all component painting except the value indicator', (WidgetTester tester) async {
    // Pump a slider with just a value indicator.
    await tester.pumpWidget(_buildApp(
      ThemeData().sliderTheme.copyWith(
        trackHeight: 0,
        overlayShape: SliderComponentShape.noOverlay,
        thumbShape: SliderComponentShape.noThumb,
        tickMarkShape: SliderTickMarkShape.noTickMark,
        showValueIndicator: ShowValueIndicator.always,
      ),
      value: 0.5,
      divisions: 4,
    ));

    final RenderBox sliderBox = tester.firstRenderObject<RenderBox>(find.byType(Slider));

    // Tap the center of the track and wait for animations to finish.
    final Offset center = tester.getCenter(find.byType(Slider));
    final TestGesture gesture = await tester.startGesture(center);
    await tester.pumpAndSettle();

    // Only 1 value indicator.
    expect(sliderBox, paintsExactlyCountTimes(#drawRect, 0));
    expect(sliderBox, paintsExactlyCountTimes(#drawCircle, 0));
    expect(sliderBox, paintsExactlyCountTimes(#drawPath, 1));

    await gesture.up();
  });
}

Widget _buildApp(
  SliderThemeData sliderTheme, {
  double value = 0.0,
  bool enabled = true,
  int divisions,
}) {
  final ValueChanged<double> onChanged = enabled ? (double d) => value = d : null;
  return MaterialApp(
    home: Scaffold(
      body: Center(
        child: SliderTheme(
          data: sliderTheme,
          child: Slider(
            value: value,
            label: '$value',
            onChanged: onChanged,
            divisions: divisions,
          ),
        ),
      ),
    ),
  );
}