scan_window_test.dart
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import 'package:flutter/painting.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:mobile_scanner/src/scan_window_calculation.dart';
void main() {
group(
'Scan window relative to texture',
() {
group('Widget (landscape) smaller than texture (portrait)', () {
const textureSize = Size(480.0, 640.0);
const widgetSize = Size(432.0, 256.0);
final ctx = ScanWindowTestContext(
textureSize: textureSize,
widgetSize: widgetSize,
scanWindow: Rect.fromLTWH(
widgetSize.width / 4,
widgetSize.height / 4,
widgetSize.width / 2,
widgetSize.height / 2,
),
);
test('wl tp: BoxFit.none', () {
ctx.testScanWindow(
BoxFit.none,
const Rect.fromLTRB(0.275, 0.4, 0.725, 0.6),
);
});
test('wl tp: BoxFit.fill', () {
ctx.testScanWindow(
BoxFit.fill,
const Rect.fromLTRB(0.25, 0.25, 0.75, 0.75),
);
});
test('wl tp: BoxFit.fitHeight', () {
ctx.testScanWindow(
BoxFit.fitHeight,
const Rect.fromLTRB(0.0, 0.25, 1.0, 0.75),
);
});
test('wl tp: BoxFit.fitWidth', () {
ctx.testScanWindow(
BoxFit.fitWidth,
const Rect.fromLTRB(
0.25,
0.38888888888888895,
0.75,
0.6111111111111112,
),
);
});
test('wl tp: BoxFit.cover', () {
// equal to fitWidth
ctx.testScanWindow(
BoxFit.cover,
const Rect.fromLTRB(
0.25,
0.38888888888888895,
0.75,
0.6111111111111112,
),
);
});
test('wl tp: BoxFit.contain', () {
// equal to fitHeigth
ctx.testScanWindow(
BoxFit.contain,
const Rect.fromLTRB(0.0, 0.25, 1.0, 0.75),
);
});
test('wl tp: BoxFit.scaleDown', () {
// equal to fitHeigth, contain
ctx.testScanWindow(
BoxFit.scaleDown,
const Rect.fromLTRB(0.0, 0.25, 1.0, 0.75),
);
});
});
group('Widget (landscape) smaller than texture and texture (landscape)',
() {
const textureSize = Size(640.0, 480.0);
const widgetSize = Size(320.0, 120.0);
final ctx = ScanWindowTestContext(
textureSize: textureSize,
widgetSize: widgetSize,
scanWindow: Rect.fromLTWH(
widgetSize.width / 4,
widgetSize.height / 4,
widgetSize.width / 2,
widgetSize.height / 2,
),
);
test('wl tl: BoxFit.none', () {
ctx.testScanWindow(
BoxFit.none,
const Rect.fromLTRB(0.375, 0.4375, 0.625, 0.5625),
);
});
test('wl tl: BoxFit.fill', () {
ctx.testScanWindow(
BoxFit.fill,
const Rect.fromLTRB(0.25, 0.25, 0.75, 0.75),
);
});
test('wl tl: BoxFit.fitHeight', () {
ctx.testScanWindow(
BoxFit.fitHeight,
const Rect.fromLTRB(0.0, 0.25, 1.0, 0.75),
);
});
test('wl tl: BoxFit.fitWidth', () {
ctx.testScanWindow(
BoxFit.fitWidth,
const Rect.fromLTRB(0.25, 0.375, 0.75, 0.625),
);
});
test('wl tl: BoxFit.cover', () {
// equal to fitWidth
ctx.testScanWindow(
BoxFit.cover,
const Rect.fromLTRB(0.25, 0.375, 0.75, 0.625),
);
});
test('wl tl: BoxFit.contain', () {
// equal to fitHeigth
ctx.testScanWindow(
BoxFit.contain,
const Rect.fromLTRB(0.0, 0.25, 1.0, 0.75),
);
});
test('wl tl: BoxFit.scaleDown', () {
// equal to fitHeigth, contain
ctx.testScanWindow(
BoxFit.scaleDown,
const Rect.fromLTRB(0.0, 0.25, 1.0, 0.75),
);
});
});
},
);
}
class ScanWindowTestContext {
ScanWindowTestContext({
required this.textureSize,
required this.widgetSize,
required this.scanWindow,
});
final Size textureSize;
final Size widgetSize;
final Rect scanWindow;
void testScanWindow(BoxFit fit, Rect expected) {
final actual = calculateScanWindowRelativeToTextureInPercentage(
fit,
scanWindow,
textureSize: textureSize,
widgetSize: widgetSize,
);
// don't use expect(actual, expected) because Rect.toString() only shows one digit after the comma which can be confusing
expect(actual.left, expected.left);
expect(actual.top, expected.top);
expect(actual.right, expected.right);
expect(actual.bottom, expected.bottom);
}
}