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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,
),
),
),
),
);
}