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// 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 'dart:math' as math;
import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:vector_math/vector_math_64.dart' show Matrix4, Quad, Vector3;
import 'gesture_utils.dart';
void main() {
group('InteractiveViewer', () {
testWidgets('child fits in viewport', (WidgetTester tester) async {
final TransformationController transformationController = TransformationController();
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: InteractiveViewer(
transformationController: transformationController,
child: const SizedBox(width: 200.0, height: 200.0),
),
),
),
),
);
expect(transformationController.value, equals(Matrix4.identity()));
// Attempting to drag to pan doesn't work because the child fits inside
// the viewport and has a tight boundary.
final Offset childOffset = tester.getTopLeft(find.byType(SizedBox));
final Offset childInterior = Offset(
childOffset.dx + 20.0,
childOffset.dy + 20.0,
);
TestGesture gesture = await tester.startGesture(childInterior);
await tester.pump();
await gesture.moveTo(childOffset);
await tester.pump();
await gesture.up();
await tester.pumpAndSettle();
expect(transformationController.value, equals(Matrix4.identity()));
// Pinch to zoom works.
final Offset scaleStart1 = childInterior;
final Offset scaleStart2 = Offset(childInterior.dx + 10.0, childInterior.dy);
final Offset scaleEnd1 = Offset(childInterior.dx - 10.0, childInterior.dy);
final Offset scaleEnd2 = Offset(childInterior.dx + 20.0, childInterior.dy);
gesture = await tester.createGesture();
final TestGesture gesture2 = await tester.createGesture();
await gesture.down(scaleStart1);
await gesture2.down(scaleStart2);
await tester.pump();
await gesture.moveTo(scaleEnd1);
await gesture2.moveTo(scaleEnd2);
await tester.pump();
await gesture.up();
await gesture2.up();
await tester.pumpAndSettle();
expect(transformationController.value, isNot(equals(Matrix4.identity())));
});
testWidgets('boundary slightly bigger than child', (WidgetTester tester) async {
final TransformationController transformationController = TransformationController();
const double boundaryMargin = 10.0;
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: InteractiveViewer(
boundaryMargin: const EdgeInsets.all(boundaryMargin),
transformationController: transformationController,
child: const SizedBox(width: 200.0, height: 200.0),
),
),
),
),
);
expect(transformationController.value, equals(Matrix4.identity()));
// Dragging to pan works only until it hits the boundary.
final Offset childOffset = tester.getTopLeft(find.byType(SizedBox));
final Offset childInterior = Offset(
childOffset.dx + 20.0,
childOffset.dy + 20.0,
);
TestGesture gesture = await tester.startGesture(childInterior);
await tester.pump();
await gesture.moveTo(childOffset);
await tester.pump();
await gesture.up();
await tester.pumpAndSettle();
final Vector3 translation = transformationController.value.getTranslation();
expect(translation.x, -boundaryMargin);
expect(translation.y, -boundaryMargin);
// Pinch to zoom also only works until expanding to the boundary.
final Offset scaleStart1 = childInterior;
final Offset scaleStart2 = Offset(childInterior.dx + 20.0, childInterior.dy);
final Offset scaleEnd1 = Offset(scaleStart1.dx + 5.0, scaleStart1.dy);
final Offset scaleEnd2 = Offset(scaleStart2.dx - 5.0, scaleStart2.dy);
gesture = await tester.createGesture();
final TestGesture gesture2 = await tester.createGesture();
await gesture.down(scaleStart1);
await gesture2.down(scaleStart2);
await tester.pump();
await gesture.moveTo(scaleEnd1);
await gesture2.moveTo(scaleEnd2);
await tester.pump();
await gesture.up();
await gesture2.up();
await tester.pumpAndSettle();
// The new scale is the scale that makes the original size (200.0) as big
// as the boundary (220.0).
expect(transformationController.value.getMaxScaleOnAxis(), 200.0 / 220.0);
});
testWidgets('child bigger than viewport', (WidgetTester tester) async {
final TransformationController transformationController = TransformationController();
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: InteractiveViewer(
constrained: false,
scaleEnabled: false,
transformationController: transformationController,
child: const SizedBox(width: 2000.0, height: 2000.0),
),
),
),
),
);
expect(transformationController.value, equals(Matrix4.identity()));
// Attempting to move against the boundary doesn't work.
final Offset childOffset = tester.getTopLeft(find.byType(SizedBox));
final Offset childInterior = Offset(
childOffset.dx + 20.0,
childOffset.dy + 20.0,
);
TestGesture gesture = await tester.startGesture(childOffset);
await tester.pump();
await gesture.moveTo(childInterior);
await tester.pump();
await gesture.up();
await tester.pumpAndSettle();
expect(transformationController.value, equals(Matrix4.identity()));
// Attempting to pinch to zoom doesn't work because it's disabled.
final Offset scaleStart1 = childInterior;
final Offset scaleStart2 = Offset(childInterior.dx + 10.0, childInterior.dy);
final Offset scaleEnd1 = Offset(childInterior.dx - 10.0, childInterior.dy);
final Offset scaleEnd2 = Offset(childInterior.dx + 20.0, childInterior.dy);
gesture = await tester.startGesture(scaleStart1);
TestGesture gesture2 = await tester.startGesture(scaleStart2);
addTearDown(gesture2.removePointer);
await tester.pump();
await gesture.moveTo(scaleEnd1);
await gesture2.moveTo(scaleEnd2);
await tester.pump();
await gesture.up();
await gesture2.up();
await tester.pumpAndSettle();
expect(transformationController.value, equals(Matrix4.identity()));
// Attempting to pinch to rotate doesn't work because it's disabled.
final Offset rotateStart1 = childInterior;
final Offset rotateStart2 = Offset(childInterior.dx + 10.0, childInterior.dy);
final Offset rotateEnd1 = Offset(childInterior.dx + 5.0, childInterior.dy + 5.0);
final Offset rotateEnd2 = Offset(childInterior.dx - 5.0, childInterior.dy - 5.0);
gesture = await tester.startGesture(rotateStart1);
gesture2 = await tester.startGesture(rotateStart2);
await tester.pump();
await gesture.moveTo(rotateEnd1);
await gesture2.moveTo(rotateEnd2);
await tester.pump();
await gesture.up();
await gesture2.up();
await tester.pumpAndSettle();
expect(transformationController.value, equals(Matrix4.identity()));
// Drag to pan away from the boundary.
gesture = await tester.startGesture(childInterior);
await tester.pump();
await gesture.moveTo(childOffset);
await tester.pump();
await gesture.up();
await tester.pumpAndSettle();
expect(transformationController.value, isNot(equals(Matrix4.identity())));
});
testWidgets('child has no dimensions', (WidgetTester tester) async {
final TransformationController transformationController = TransformationController();
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: InteractiveViewer(
constrained: false,
scaleEnabled: false,
transformationController: transformationController,
child: const SizedBox(width: 0.0, height: 0.0),
),
),
),
),
);
expect(transformationController.value, equals(Matrix4.identity()));
// Interacting throws an error because the child has no size.
final Offset childOffset = tester.getTopLeft(find.byType(SizedBox));
final Offset childInterior = Offset(
childOffset.dx + 20.0,
childOffset.dy + 20.0,
);
final TestGesture gesture = await tester.startGesture(childOffset);
await tester.pump();
await gesture.moveTo(childInterior);
await tester.pump();
await gesture.up();
await tester.pumpAndSettle();
expect(transformationController.value, equals(Matrix4.identity()));
expect(tester.takeException(), isAssertionError);
});
testWidgets('no boundary', (WidgetTester tester) async {
final TransformationController transformationController = TransformationController();
const double minScale = 0.8;
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: InteractiveViewer(
boundaryMargin: const EdgeInsets.all(double.infinity),
transformationController: transformationController,
child: const SizedBox(width: 200.0, height: 200.0),
),
),
),
),
);
expect(transformationController.value, equals(Matrix4.identity()));
// Drag to pan works because even though the viewport fits perfectly
// around the child, there is no boundary.
final Offset childOffset = tester.getTopLeft(find.byType(SizedBox));
final Offset childInterior = Offset(
childOffset.dx + 20.0,
childOffset.dy + 20.0,
);
TestGesture gesture = await tester.startGesture(childInterior);
await tester.pump();
await gesture.moveTo(childOffset);
await tester.pump();
await gesture.up();
await tester.pumpAndSettle();
final Vector3 translation = transformationController.value.getTranslation();
expect(translation.x, childOffset.dx - childInterior.dx);
expect(translation.y, childOffset.dy - childInterior.dy);
// It's also possible to zoom out and view beyond the child because there
// is no boundary.
final Offset scaleStart1 = childInterior;
final Offset scaleStart2 = Offset(childInterior.dx + 20.0, childInterior.dy);
final Offset scaleEnd1 = Offset(childInterior.dx + 5.0, childInterior.dy);
final Offset scaleEnd2 = Offset(childInterior.dx - 5.0, childInterior.dy);
gesture = await tester.createGesture();
final TestGesture gesture2 = await tester.createGesture();
await gesture.down(scaleStart1);
await gesture2.down(scaleStart2);
await tester.pump();
await gesture.moveTo(scaleEnd1);
await gesture2.moveTo(scaleEnd2);
await tester.pump();
await gesture.up();
await gesture2.up();
await tester.pumpAndSettle();
expect(transformationController.value.getMaxScaleOnAxis(), minScale);
});
testWidgets('PanAxis.free allows panning in all directions for diagonal gesture', (WidgetTester tester) async {
final TransformationController transformationController = TransformationController();
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: InteractiveViewer(
boundaryMargin: const EdgeInsets.all(double.infinity),
transformationController: transformationController,
child: const SizedBox(width: 200.0, height: 200.0),
),
),
),
),
);
expect(transformationController.value, equals(Matrix4.identity()));
// Perform a diagonal drag gesture.
final Offset childOffset = tester.getTopLeft(find.byType(SizedBox));
final Offset childInterior = Offset(
childOffset.dx + 20.0,
childOffset.dy + 20.0,
);
final TestGesture gesture = await tester.startGesture(childInterior);
await tester.pump();
await gesture.moveTo(childOffset);
await tester.pump();
await gesture.up();
await tester.pumpAndSettle();
// Translation has only happened along the y axis (the default axis when
// a gesture is perfectly at 45 degrees to the axes).
final Vector3 translation = transformationController.value.getTranslation();
expect(translation.x, childOffset.dx - childInterior.dx);
expect(translation.y, childOffset.dy - childInterior.dy);
});
testWidgets('PanAxis.aligned allows panning in one direction only for diagonal gesture', (WidgetTester tester) async {
final TransformationController transformationController = TransformationController();
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: InteractiveViewer(
panAxis: PanAxis.aligned,
boundaryMargin: const EdgeInsets.all(double.infinity),
transformationController: transformationController,
child: const SizedBox(width: 200.0, height: 200.0),
),
),
),
),
);
expect(transformationController.value, equals(Matrix4.identity()));
// Perform a diagonal drag gesture.
final Offset childOffset = tester.getTopLeft(find.byType(SizedBox));
final Offset childInterior = Offset(
childOffset.dx + 20.0,
childOffset.dy + 20.0,
);
final TestGesture gesture = await tester.startGesture(childInterior);
await tester.pump();
await gesture.moveTo(childOffset);
await tester.pump();
await gesture.up();
await tester.pumpAndSettle();
// Translation has only happened along the y axis (the default axis when
// a gesture is perfectly at 45 degrees to the axes).
final Vector3 translation = transformationController.value.getTranslation();
expect(translation.x, 0.0);
expect(translation.y, childOffset.dy - childInterior.dy);
});
testWidgets('PanAxis.aligned allows panning in one direction only for horizontal leaning gesture', (WidgetTester tester) async {
final TransformationController transformationController = TransformationController();
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: InteractiveViewer(
panAxis: PanAxis.aligned,
boundaryMargin: const EdgeInsets.all(double.infinity),
transformationController: transformationController,
child: const SizedBox(width: 200.0, height: 200.0),
),
),
),
),
);
expect(transformationController.value, equals(Matrix4.identity()));
// Perform a horizontally leaning diagonal drag gesture.
final Offset childOffset = tester.getTopLeft(find.byType(SizedBox));
final Offset childInterior = Offset(
childOffset.dx + 20.0,
childOffset.dy + 10.0,
);
final TestGesture gesture = await tester.startGesture(childInterior);
await tester.pump();
await gesture.moveTo(childOffset);
await tester.pump();
await gesture.up();
await tester.pumpAndSettle();
// Translation happened only along the x axis because that's the axis that
// had the greatest movement.
final Vector3 translation = transformationController.value.getTranslation();
expect(translation.x, childOffset.dx - childInterior.dx);
expect(translation.y, 0.0);
});
testWidgets('PanAxis.horizontal allows panning in the horizontal direction only for diagonal gesture', (WidgetTester tester) async {
final TransformationController transformationController = TransformationController();
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: InteractiveViewer(
panAxis: PanAxis.horizontal,
boundaryMargin: const EdgeInsets.all(double.infinity),
transformationController: transformationController,
child: const SizedBox(width: 200.0, height: 200.0),
),
),
),
),
);
expect(transformationController.value, equals(Matrix4.identity()));
// Perform a diagonal drag gesture.
final Offset childOffset = tester.getTopLeft(find.byType(SizedBox));
final Offset childInterior = Offset(
childOffset.dx + 20.0,
childOffset.dy + 20.0,
);
final TestGesture gesture = await tester.startGesture(childInterior);
await tester.pump();
await gesture.moveTo(childOffset);
await tester.pump();
await gesture.up();
await tester.pumpAndSettle();
// Translation has only happened along the x axis (the default axis when
// a gesture is perfectly at 45 degrees to the axes).
final Vector3 translation = transformationController.value.getTranslation();
expect(translation.x, childOffset.dx - childInterior.dx);
expect(translation.y, 0.0);
});
testWidgets('PanAxis.horizontal allows panning in the horizontal direction only for horizontal leaning gesture', (WidgetTester tester) async {
final TransformationController transformationController = TransformationController();
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: InteractiveViewer(
panAxis: PanAxis.horizontal,
boundaryMargin: const EdgeInsets.all(double.infinity),
transformationController: transformationController,
child: const SizedBox(width: 200.0, height: 200.0),
),
),
),
),
);
expect(transformationController.value, equals(Matrix4.identity()));
// Perform a horizontally leaning diagonal drag gesture.
final Offset childOffset = tester.getTopLeft(find.byType(SizedBox));
final Offset childInterior = Offset(
childOffset.dx + 20.0,
childOffset.dy + 10.0,
);
final TestGesture gesture = await tester.startGesture(childInterior);
await tester.pump();
await gesture.moveTo(childOffset);
await tester.pump();
await gesture.up();
await tester.pumpAndSettle();
// Translation happened only along the x axis because that's the axis that
// had been set to the panningDirection parameter.
final Vector3 translation = transformationController.value.getTranslation();
expect(translation.x, childOffset.dx - childInterior.dx);
expect(translation.y, 0.0);
});
testWidgets('PanAxis.horizontal does not allow panning in vertical direction on vertical gesture', (WidgetTester tester) async {
final TransformationController transformationController = TransformationController();
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: InteractiveViewer(
panAxis: PanAxis.horizontal,
boundaryMargin: const EdgeInsets.all(double.infinity),
transformationController: transformationController,
child: const SizedBox(width: 200.0, height: 200.0),
),
),
),
),
);
expect(transformationController.value, equals(Matrix4.identity()));
// Perform a horizontally leaning diagonal drag gesture.
final Offset childOffset = tester.getTopLeft(find.byType(SizedBox));
final Offset childInterior = Offset(
childOffset.dx + 0.0,
childOffset.dy + 10.0,
);
final TestGesture gesture = await tester.startGesture(childInterior);
await tester.pump();
await gesture.moveTo(childOffset);
await tester.pump();
await gesture.up();
await tester.pumpAndSettle();
// Translation didn't happen because the only axis allowed to do panning
// is the horizontal.
final Vector3 translation = transformationController.value.getTranslation();
expect(translation.x, 0.0);
expect(translation.y, 0.0);
});
testWidgets('PanAxis.vertical allows panning in the vertical direction only for diagonal gesture', (WidgetTester tester) async {
final TransformationController transformationController = TransformationController();
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: InteractiveViewer(
panAxis: PanAxis.vertical,
boundaryMargin: const EdgeInsets.all(double.infinity),
transformationController: transformationController,
child: const SizedBox(width: 200.0, height: 200.0),
),
),
),
),
);
expect(transformationController.value, equals(Matrix4.identity()));
// Perform a diagonal drag gesture.
final Offset childOffset = tester.getTopLeft(find.byType(SizedBox));
final Offset childInterior = Offset(
childOffset.dx + 20.0,
childOffset.dy + 20.0,
);
final TestGesture gesture = await tester.startGesture(childInterior);
await tester.pump();
await gesture.moveTo(childOffset);
await tester.pump();
await gesture.up();
await tester.pumpAndSettle();
// Translation has only happened along the x axis (the default axis when
// a gesture is perfectly at 45 degrees to the axes).
final Vector3 translation = transformationController.value.getTranslation();
expect(translation.y, childOffset.dy - childInterior.dy);
expect(translation.x, 0.0);
});
testWidgets('PanAxis.vertical allows panning in the vertical direction only for vertical leaning gesture', (WidgetTester tester) async {
final TransformationController transformationController = TransformationController();
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: InteractiveViewer(
panAxis: PanAxis.vertical,
boundaryMargin: const EdgeInsets.all(double.infinity),
transformationController: transformationController,
child: const SizedBox(width: 200.0, height: 200.0),
),
),
),
),
);
expect(transformationController.value, equals(Matrix4.identity()));
// Perform a horizontally leaning diagonal drag gesture.
final Offset childOffset = tester.getTopLeft(find.byType(SizedBox));
final Offset childInterior = Offset(
childOffset.dx + 20.0,
childOffset.dy + 10.0,
);
final TestGesture gesture = await tester.startGesture(childInterior);
await tester.pump();
await gesture.moveTo(childOffset);
await tester.pump();
await gesture.up();
await tester.pumpAndSettle();
// Translation happened only along the x axis because that's the axis that
// had been set to the panningDirection parameter.
final Vector3 translation = transformationController.value.getTranslation();
expect(translation.y, childOffset.dy - childInterior.dy);
expect(translation.x, 0.0);
});
testWidgets('PanAxis.vertical does not allow panning in horizontal direction on vertical gesture', (WidgetTester tester) async {
final TransformationController transformationController = TransformationController();
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: InteractiveViewer(
panAxis: PanAxis.vertical,
boundaryMargin: const EdgeInsets.all(double.infinity),
transformationController: transformationController,
child: const SizedBox(width: 200.0, height: 200.0),
),
),
),
),
);
expect(transformationController.value, equals(Matrix4.identity()));
// Perform a horizontally leaning diagonal drag gesture.
final Offset childOffset = tester.getTopLeft(find.byType(SizedBox));
final Offset childInterior = Offset(
childOffset.dx + 10.0,
childOffset.dy + 0.0,
);
final TestGesture gesture = await tester.startGesture(childInterior);
await tester.pump();
await gesture.moveTo(childOffset);
await tester.pump();
await gesture.up();
await tester.pumpAndSettle();
// Translation didn't happen because the only axis allowed to do panning
// is the horizontal.
final Vector3 translation = transformationController.value.getTranslation();
expect(translation.x, 0.0);
expect(translation.y, 0.0);
});
testWidgets('inertia fling and boundary sliding', (WidgetTester tester) async {
final TransformationController transformationController = TransformationController();
const double boundaryMargin = 50.0;
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: InteractiveViewer(
boundaryMargin: const EdgeInsets.all(boundaryMargin),
transformationController: transformationController,
child: const SizedBox(width: 200.0, height: 200.0),
),
),
),
),
);
// Fling the child.
final Offset childOffset = tester.getTopLeft(find.byType(SizedBox));
const Offset flingEnd = Offset(20.0, 15.0);
await tester.flingFrom(childOffset, flingEnd, 1000.0);
await tester.pump();
// Immediately after the gesture, the child has moved to exactly follow
// the gesture.
Vector3 translation = transformationController.value.getTranslation();
expect(translation.x, flingEnd.dx);
expect(translation.y, flingEnd.dy);
// A short time after the gesture was released, it continues to move with
// inertia.
await tester.pump(const Duration(milliseconds: 10));
translation = transformationController.value.getTranslation();
expect(translation.x, greaterThan(20.0));
expect(translation.y, greaterThan(10.0));
expect(translation.x, lessThan(boundaryMargin));
expect(translation.y, lessThan(boundaryMargin));
// It hits the boundary in the x direction first.
await tester.pump(const Duration(milliseconds: 60));
translation = transformationController.value.getTranslation();
expect(translation.x, moreOrLessEquals(boundaryMargin, epsilon: 1e-9));
expect(translation.y, lessThan(boundaryMargin));
final double yWhenXHits = translation.y;
// x is held to the boundary while y slides along.
await tester.pump(const Duration(milliseconds: 50));
translation = transformationController.value.getTranslation();
expect(translation.x, moreOrLessEquals(boundaryMargin, epsilon: 1e-9));
expect(translation.y, greaterThan(yWhenXHits));
expect(translation.y, lessThan(boundaryMargin));
// Eventually it ends up in the corner.
await tester.pumpAndSettle();
translation = transformationController.value.getTranslation();
expect(translation.x, moreOrLessEquals(boundaryMargin, epsilon: 1e-9));
expect(translation.y, moreOrLessEquals(boundaryMargin, epsilon: 1e-9));
});
testWidgets('Scaling automatically causes a centering translation', (WidgetTester tester) async {
final TransformationController transformationController = TransformationController();
const double boundaryMargin = 50.0;
const double minScale = 0.1;
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: InteractiveViewer(
boundaryMargin: const EdgeInsets.all(boundaryMargin),
minScale: minScale,
transformationController: transformationController,
child: const SizedBox(width: 200.0, height: 200.0),
),
),
),
),
);
Vector3 translation = transformationController.value.getTranslation();
expect(translation.x, 0.0);
expect(translation.y, 0.0);
// Pan into the corner of the boundaries.
final Offset childOffset = tester.getTopLeft(find.byType(SizedBox));
const Offset flingEnd = Offset(20.0, 15.0);
await tester.flingFrom(childOffset, flingEnd, 1000.0);
await tester.pumpAndSettle();
translation = transformationController.value.getTranslation();
expect(translation.x, moreOrLessEquals(boundaryMargin, epsilon: 1e-9));
expect(translation.y, moreOrLessEquals(boundaryMargin, epsilon: 1e-9));
// Zoom out so the entire child is visible. The child will also be
// translated in order to keep it inside the boundaries.
final Offset childCenter = tester.getCenter(find.byType(SizedBox));
Offset scaleStart1 = Offset(childCenter.dx - 40.0, childCenter.dy);
Offset scaleStart2 = Offset(childCenter.dx + 40.0, childCenter.dy);
Offset scaleEnd1 = Offset(childCenter.dx - 10.0, childCenter.dy);
Offset scaleEnd2 = Offset(childCenter.dx + 10.0, childCenter.dy);
TestGesture gesture = await tester.createGesture();
TestGesture gesture2 = await tester.createGesture();
await gesture.down(scaleStart1);
await gesture2.down(scaleStart2);
await tester.pump();
await gesture.moveTo(scaleEnd1);
await gesture2.moveTo(scaleEnd2);
await tester.pump();
await gesture.up();
await gesture2.up();
await tester.pumpAndSettle();
expect(transformationController.value.getMaxScaleOnAxis(), lessThan(1.0));
translation = transformationController.value.getTranslation();
expect(translation.x, lessThan(boundaryMargin));
expect(translation.y, lessThan(boundaryMargin));
expect(translation.x, greaterThan(0.0));
expect(translation.y, greaterThan(0.0));
expect(translation.x, moreOrLessEquals(translation.y, epsilon: 1e-9));
// Zoom in on a point that's not the center, and see that it remains at
// roughly the same location in the viewport after the zoom.
scaleStart1 = Offset(childCenter.dx - 50.0, childCenter.dy);
scaleStart2 = Offset(childCenter.dx - 30.0, childCenter.dy);
scaleEnd1 = Offset(childCenter.dx - 51.0, childCenter.dy);
scaleEnd2 = Offset(childCenter.dx - 29.0, childCenter.dy);
final Offset viewportFocalPoint = Offset(
childCenter.dx - 40.0 - childOffset.dx,
childCenter.dy - childOffset.dy,
);
final Offset sceneFocalPoint = transformationController.toScene(viewportFocalPoint);
gesture = await tester.createGesture();
gesture2 = await tester.createGesture();
await gesture.down(scaleStart1);
await gesture2.down(scaleStart2);
await tester.pump();
await gesture.moveTo(scaleEnd1);
await gesture2.moveTo(scaleEnd2);
await tester.pump();
await gesture.up();
await gesture2.up();
await tester.pumpAndSettle();
final Offset newSceneFocalPoint = transformationController.toScene(viewportFocalPoint);
expect(newSceneFocalPoint.dx, moreOrLessEquals(sceneFocalPoint.dx, epsilon: 1.0));
expect(newSceneFocalPoint.dy, moreOrLessEquals(sceneFocalPoint.dy, epsilon: 1.0));
});
testWidgets('Scaling automatically causes a centering translation even when alignPanAxis is set', (WidgetTester tester) async {
final TransformationController transformationController = TransformationController();
const double boundaryMargin = 50.0;
const double minScale = 0.1;
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: InteractiveViewer(
panAxis: PanAxis.aligned,
boundaryMargin: const EdgeInsets.all(boundaryMargin),
minScale: minScale,
transformationController: transformationController,
child: const SizedBox(width: 200.0, height: 200.0),
),
),
),
),
);
Vector3 translation = transformationController.value.getTranslation();
expect(translation.x, 0.0);
expect(translation.y, 0.0);
// Pan into the corner of the boundaries in two gestures, since
// alignPanAxis prevents diagonal panning.
final Offset childOffset1 = tester.getTopLeft(find.byType(SizedBox));
const Offset flingEnd1 = Offset(20.0, 0.0);
await tester.flingFrom(childOffset1, flingEnd1, 1000.0);
await tester.pumpAndSettle();
await tester.pump(const Duration(seconds: 5));
final Offset childOffset2 = tester.getTopLeft(find.byType(SizedBox));
const Offset flingEnd2 = Offset(0.0, 15.0);
await tester.flingFrom(childOffset2, flingEnd2, 1000.0);
await tester.pumpAndSettle();
translation = transformationController.value.getTranslation();
expect(translation.x, moreOrLessEquals(boundaryMargin, epsilon: 1e-9));
expect(translation.y, moreOrLessEquals(boundaryMargin, epsilon: 1e-9));
// Zoom out so the entire child is visible. The child will also be
// translated in order to keep it inside the boundaries.
final Offset childCenter = tester.getCenter(find.byType(SizedBox));
Offset scaleStart1 = Offset(childCenter.dx - 40.0, childCenter.dy);
Offset scaleStart2 = Offset(childCenter.dx + 40.0, childCenter.dy);
Offset scaleEnd1 = Offset(childCenter.dx - 10.0, childCenter.dy);
Offset scaleEnd2 = Offset(childCenter.dx + 10.0, childCenter.dy);
TestGesture gesture = await tester.createGesture();
TestGesture gesture2 = await tester.createGesture();
await gesture.down(scaleStart1);
await gesture2.down(scaleStart2);
await tester.pump();
await gesture.moveTo(scaleEnd1);
await gesture2.moveTo(scaleEnd2);
await tester.pump();
await gesture.up();
await gesture2.up();
await tester.pumpAndSettle();
expect(transformationController.value.getMaxScaleOnAxis(), lessThan(1.0));
translation = transformationController.value.getTranslation();
expect(translation.x, lessThan(boundaryMargin));
expect(translation.y, lessThan(boundaryMargin));
expect(translation.x, greaterThan(0.0));
expect(translation.y, greaterThan(0.0));
expect(translation.x, moreOrLessEquals(translation.y, epsilon: 1e-9));
// Zoom in on a point that's not the center, and see that it remains at
// roughly the same location in the viewport after the zoom.
scaleStart1 = Offset(childCenter.dx - 50.0, childCenter.dy);
scaleStart2 = Offset(childCenter.dx - 30.0, childCenter.dy);
scaleEnd1 = Offset(childCenter.dx - 51.0, childCenter.dy);
scaleEnd2 = Offset(childCenter.dx - 29.0, childCenter.dy);
final Offset viewportFocalPoint = Offset(
childCenter.dx - 40.0 - childOffset1.dx,
childCenter.dy - childOffset1.dy,
);
final Offset sceneFocalPoint = transformationController.toScene(viewportFocalPoint);
gesture = await tester.createGesture();
gesture2 = await tester.createGesture();
await gesture.down(scaleStart1);
await gesture2.down(scaleStart2);
await tester.pump();
await gesture.moveTo(scaleEnd1);
await gesture2.moveTo(scaleEnd2);
await tester.pump();
await gesture.up();
await gesture2.up();
await tester.pumpAndSettle();
final Offset newSceneFocalPoint = transformationController.toScene(viewportFocalPoint);
expect(newSceneFocalPoint.dx, moreOrLessEquals(sceneFocalPoint.dx, epsilon: 1.0));
expect(newSceneFocalPoint.dy, moreOrLessEquals(sceneFocalPoint.dy, epsilon: 1.0));
});
testWidgets('Can scale with mouse', (WidgetTester tester) async {
final TransformationController transformationController = TransformationController();
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: InteractiveViewer(
transformationController: transformationController,
child: const SizedBox(width: 200.0, height: 200.0),
),
),
),
),
);
final Offset center = tester.getCenter(find.byType(InteractiveViewer));
await scrollAt(center, tester, const Offset(0.0, -20.0));
await tester.pumpAndSettle();
expect(transformationController.value.getMaxScaleOnAxis(), greaterThan(1.0));
});
testWidgets('Cannot scale with mouse when scale is disabled', (WidgetTester tester) async {
final TransformationController transformationController = TransformationController();
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: InteractiveViewer(
transformationController: transformationController,
scaleEnabled: false,
child: const SizedBox(width: 200.0, height: 200.0),
),
),
),
),
);
final Offset center = tester.getCenter(find.byType(InteractiveViewer));
await scrollAt(center, tester, const Offset(0.0, -20.0));
await tester.pumpAndSettle();
expect(transformationController.value.getMaxScaleOnAxis(), equals(1.0));
});
testWidgets('Scale with mouse returns onInteraction properties', (WidgetTester tester) async{
final TransformationController transformationController = TransformationController();
late Offset focalPoint;
late Offset localFocalPoint;
late double scaleChange;
late Velocity currentVelocity;
late bool calledStart;
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: InteractiveViewer(
transformationController: transformationController,
onInteractionStart: (ScaleStartDetails details) {
calledStart = true;
},
onInteractionUpdate: (ScaleUpdateDetails details) {
scaleChange = details.scale;
focalPoint = details.focalPoint;
localFocalPoint = details.localFocalPoint;
},
onInteractionEnd: (ScaleEndDetails details) {
currentVelocity = details.velocity;
},
child: const SizedBox(width: 200.0, height: 200.0),
),
),
),
),
);
final Offset center = tester.getCenter(find.byType(InteractiveViewer));
await scrollAt(center, tester, const Offset(0.0, -20.0));
await tester.pumpAndSettle();
const Velocity noMovement = Velocity.zero;
final double afterScaling = transformationController.value.getMaxScaleOnAxis();
expect(scaleChange, greaterThan(1.0));
expect(afterScaling, scaleChange);
expect(currentVelocity, equals(noMovement));
expect(calledStart, equals(true));
// Focal points are given in coordinates outside of InteractiveViewer,
// with local being in relation to the viewport.
expect(focalPoint, center);
expect(localFocalPoint, const Offset(100, 100));
// The scene point is the same as localFocalPoint because the center of
// the scene is at the center of the viewport.
final Offset scenePoint = transformationController.toScene(localFocalPoint);
expect(scenePoint, const Offset(100, 100));
});
testWidgets('Scaling amount is equal forth and back with a mouse scroll', (WidgetTester tester) async {
final TransformationController transformationController = TransformationController();
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: InteractiveViewer(
constrained: false,
maxScale: 100000,
minScale: 0.01,
transformationController: transformationController,
child: const SizedBox(width: 1000.0, height: 1000.0),
),
),
),
),
);
final Offset center = tester.getCenter(find.byType(InteractiveViewer));
await scrollAt(center, tester, const Offset(0.0, -200.0));
await tester.pumpAndSettle();
expect(transformationController.value.getMaxScaleOnAxis(), math.exp(200 / 200));
await scrollAt(center, tester, const Offset(0.0, -200.0));
await tester.pumpAndSettle();
// math.exp round the number too short compared to the one in transformationController.
expect(transformationController.value.getMaxScaleOnAxis(), closeTo(math.exp(400 / 200), 0.000000000000001));
await scrollAt(center, tester, const Offset(0.0, 200.0));
await scrollAt(center, tester, const Offset(0.0, 200.0));
await tester.pumpAndSettle();
expect(transformationController.value.getMaxScaleOnAxis(), 1.0);
});
testWidgets('onInteraction can be used to get scene point', (WidgetTester tester) async{
final TransformationController transformationController = TransformationController();
late Offset focalPoint;
late Offset localFocalPoint;
late double scaleChange;
late Velocity currentVelocity;
late bool calledStart;
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: InteractiveViewer(
transformationController: transformationController,
onInteractionStart: (ScaleStartDetails details) {
calledStart = true;
},
onInteractionUpdate: (ScaleUpdateDetails details) {
scaleChange = details.scale;
focalPoint = details.focalPoint;
localFocalPoint = details.localFocalPoint;
},
onInteractionEnd: (ScaleEndDetails details) {
currentVelocity = details.velocity;
},
child: const SizedBox(width: 200.0, height: 200.0),
),
),
),
),
);
final Offset center = tester.getCenter(find.byType(InteractiveViewer));
final Offset offCenter = Offset(center.dx - 20.0, center.dy - 20.0);
await scrollAt(offCenter, tester, const Offset(0.0, -20.0));
await tester.pumpAndSettle();
const Velocity noMovement = Velocity.zero;
final double afterScaling = transformationController.value.getMaxScaleOnAxis();
expect(scaleChange, greaterThan(1.0));
expect(afterScaling, scaleChange);
expect(currentVelocity, equals(noMovement));
expect(calledStart, equals(true));
// Focal points are given in coordinates outside of InteractiveViewer,
// with local being in relation to the viewport.
expect(focalPoint, offCenter);
expect(localFocalPoint, const Offset(80, 80));
// The top left corner of the viewport is not at the top left corner of
// the scene.
final Offset scenePoint = transformationController.toScene(Offset.zero);
expect(scenePoint.dx, greaterThan(0.0));
expect(scenePoint.dy, greaterThan(0.0));
});
testWidgets('onInteraction is called even when disabled (touch)', (WidgetTester tester) async {
final TransformationController transformationController = TransformationController();
bool calledStart = false;
bool calledUpdate = false;
bool calledEnd = false;
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: InteractiveViewer(
transformationController: transformationController,
scaleEnabled: false,
onInteractionStart: (ScaleStartDetails details) {
calledStart = true;
},
onInteractionUpdate: (ScaleUpdateDetails details) {
calledUpdate = true;
},
onInteractionEnd: (ScaleEndDetails details) {
calledEnd = true;
},
child: const SizedBox(width: 200.0, height: 200.0),
),
),
),
),
);
final Offset childOffset = tester.getTopLeft(find.byType(SizedBox));
final Offset childInterior = Offset(
childOffset.dx + 20.0,
childOffset.dy + 20.0,
);
TestGesture gesture = await tester.startGesture(childOffset);
// Attempting to pan doesn't work because it's disabled, but the
// interaction methods are still called.
await tester.pump();
await gesture.moveTo(childInterior);
await tester.pump();
await gesture.up();
await tester.pumpAndSettle();
expect(transformationController.value, equals(Matrix4.identity()));
expect(calledStart, isTrue);
expect(calledUpdate, isTrue);
expect(calledEnd, isTrue);
// Attempting to pinch to zoom doesn't work because it's disabled, but the
// interaction methods are still called.
calledStart = false;
calledUpdate = false;
calledEnd = false;
final Offset scaleStart1 = childInterior;
final Offset scaleStart2 = Offset(childInterior.dx + 10.0, childInterior.dy);
final Offset scaleEnd1 = Offset(childInterior.dx - 10.0, childInterior.dy);
final Offset scaleEnd2 = Offset(childInterior.dx + 20.0, childInterior.dy);
gesture = await tester.startGesture(scaleStart1);
final TestGesture gesture2 = await tester.startGesture(scaleStart2);
addTearDown(gesture2.removePointer);
await tester.pump();
await gesture.moveTo(scaleEnd1);
await gesture2.moveTo(scaleEnd2);
await tester.pump();
await gesture.up();
await gesture2.up();
await tester.pumpAndSettle();
expect(transformationController.value, equals(Matrix4.identity()));
expect(calledStart, isTrue);
expect(calledUpdate, isTrue);
expect(calledEnd, isTrue);
}, variant: const TargetPlatformVariant(<TargetPlatform>{ TargetPlatform.android, TargetPlatform.iOS }));
testWidgets('onInteraction is called even when disabled (mouse)', (WidgetTester tester) async {
final TransformationController transformationController = TransformationController();
bool calledStart = false;
bool calledUpdate = false;
bool calledEnd = false;
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: InteractiveViewer(
transformationController: transformationController,
scaleEnabled: false,
onInteractionStart: (ScaleStartDetails details) {
calledStart = true;
},
onInteractionUpdate: (ScaleUpdateDetails details) {
calledUpdate = true;
},
onInteractionEnd: (ScaleEndDetails details) {
calledEnd = true;
},
child: const SizedBox(width: 200.0, height: 200.0),
),
),
),
),
);
final Offset childOffset = tester.getTopLeft(find.byType(SizedBox));
final Offset childInterior = Offset(
childOffset.dx + 20.0,
childOffset.dy + 20.0,
);
final TestGesture gesture = await tester.startGesture(childOffset, kind: PointerDeviceKind.mouse);
// Attempting to pan doesn't work because it's disabled, but the
// interaction methods are still called.
await tester.pump();
await gesture.moveTo(childInterior);
await tester.pump();
await gesture.up();
await tester.pumpAndSettle();
expect(transformationController.value, equals(Matrix4.identity()));
expect(calledStart, isTrue);
expect(calledUpdate, isTrue);
expect(calledEnd, isTrue);
// Attempting to scroll with a mouse to zoom doesn't work because it's
// disabled, but the interaction methods are still called.
calledStart = false;
calledUpdate = false;
calledEnd = false;
await scrollAt(childInterior, tester, const Offset(0.0, -20.0));
await tester.pumpAndSettle();
expect(transformationController.value, equals(Matrix4.identity()));
expect(calledStart, isTrue);
expect(calledUpdate, isTrue);
expect(calledEnd, isTrue);
}, variant: const TargetPlatformVariant(<TargetPlatform>{ TargetPlatform.macOS, TargetPlatform.linux, TargetPlatform.windows }));
testWidgets('viewport changes size', (WidgetTester tester) async {
final TransformationController transformationController = TransformationController();
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: InteractiveViewer(
transformationController: transformationController,
child: Container(),
),
),
),
),
);
expect(transformationController.value, equals(Matrix4.identity()));
// Attempting to drag to pan doesn't work because the child fits inside
// the viewport and has a tight boundary.
final Offset childOffset = tester.getTopLeft(find.byType(Container));
final Offset childInterior = Offset(
childOffset.dx + 20.0,
childOffset.dy + 20.0,
);
TestGesture gesture = await tester.startGesture(childInterior);
await tester.pump();
await gesture.moveTo(childOffset);
await tester.pump();
await gesture.up();
await tester.pumpAndSettle();
expect(transformationController.value, equals(Matrix4.identity()));
// Shrink the size of the screen.
tester.binding.window.physicalSizeTestValue = const Size(100.0, 100.0);
addTearDown(tester.binding.window.clearPhysicalSizeTestValue);
await tester.pump();
// Attempting to drag to pan still doesn't work, because the image has
// resized itself to fit the new screen size, and InteractiveViewer has
// updated its measurements to take that into consideration.
gesture = await tester.startGesture(childInterior);
await tester.pump();
await gesture.moveTo(childOffset);
await tester.pump();
await gesture.up();
await tester.pumpAndSettle();
expect(transformationController.value, equals(Matrix4.identity()));
});
testWidgets('gesture can start as pan and become scale', (WidgetTester tester) async {
final TransformationController transformationController = TransformationController();
const double boundaryMargin = 50.0;
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: InteractiveViewer(
boundaryMargin: const EdgeInsets.all(boundaryMargin),
transformationController: transformationController,
child: const SizedBox(width: 200.0, height: 200.0),
),
),
),
),
);
Vector3 translation = transformationController.value.getTranslation();
expect(translation.x, 0.0);
expect(translation.y, 0.0);
// Start a pan gesture.
final Offset childCenter = tester.getCenter(find.byType(SizedBox));
final TestGesture gesture = await tester.createGesture();
await gesture.down(childCenter);
await tester.pump();
await gesture.moveTo(Offset(
childCenter.dx + 5.0,
childCenter.dy + 5.0,
));
await tester.pump();
translation = transformationController.value.getTranslation();
expect(translation.x, greaterThan(0.0));
expect(translation.y, greaterThan(0.0));
// Put another finger down and turn it into a scale gesture.
final TestGesture gesture2 = await tester.createGesture();
await gesture2.down(Offset(
childCenter.dx - 5.0,
childCenter.dy - 5.0,
));
await tester.pump();
await gesture.moveTo(Offset(
childCenter.dx + 25.0,
childCenter.dy + 25.0,
));
await gesture2.moveTo(Offset(
childCenter.dx - 25.0,
childCenter.dy - 25.0,
));
await tester.pump();
await gesture.up();
await gesture2.up();
await tester.pumpAndSettle();
expect(transformationController.value.getMaxScaleOnAxis(), greaterThan(1.0));
});
// Regression test for https://github.com/flutter/flutter/issues/65304
testWidgets('can view beyond boundary when necessary for a small child', (WidgetTester tester) async {
final TransformationController transformationController = TransformationController();
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: InteractiveViewer(
constrained: false,
minScale: 1.0,
maxScale: 1.0,
transformationController: transformationController,
child: const SizedBox(width: 200.0, height: 200.0),
),
),
),
),
);
expect(transformationController.value, equals(Matrix4.identity()));
// Pinch to zoom does nothing because minScale and maxScale are 1.0.
final Offset center = tester.getCenter(find.byType(SizedBox));
final Offset scaleStart1 = Offset(center.dx - 10.0, center.dy - 10.0);
final Offset scaleStart2 = Offset(center.dx + 10.0, center.dy + 10.0);
final Offset scaleEnd1 = Offset(center.dx - 20.0, center.dy - 20.0);
final Offset scaleEnd2 = Offset(center.dx + 20.0, center.dy + 20.0);
final TestGesture gesture = await tester.createGesture();
final TestGesture gesture2 = await tester.createGesture();
await gesture.down(scaleStart1);
await gesture2.down(scaleStart2);
await tester.pump();
await gesture.moveTo(scaleEnd1);
await gesture2.moveTo(scaleEnd2);
await tester.pump();
await gesture.up();
await gesture2.up();
await tester.pumpAndSettle();
expect(transformationController.value, equals(Matrix4.identity()));
});
testWidgets('scale does not jump when wrapped in GestureDetector', (WidgetTester tester) async {
final TransformationController transformationController = TransformationController();
double? initialScale;
double? scale;
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: GestureDetector(
onTapUp: (TapUpDetails details) {},
child: InteractiveViewer(
onInteractionUpdate: (ScaleUpdateDetails details) {
initialScale ??= details.scale;
scale = details.scale;
},
transformationController: transformationController,
child: const SizedBox(width: 200.0, height: 200.0),
),
),
),
),
),
);
expect(transformationController.value, equals(Matrix4.identity()));
expect(initialScale, null);
expect(scale, null);
// Pinch to zoom isn't immediately detected for a small amount of
// movement due to the GestureDetector.
final Offset childOffset = tester.getTopLeft(find.byType(SizedBox));
final Offset childInterior = Offset(
childOffset.dx + 20.0,
childOffset.dy + 20.0,
);
final Offset scaleStart1 = childInterior;
final Offset scaleStart2 = Offset(childInterior.dx + 10.0, childInterior.dy);
Offset scaleEnd1 = Offset(childInterior.dx - 10.0, childInterior.dy);
Offset scaleEnd2 = Offset(childInterior.dx + 20.0, childInterior.dy);
TestGesture gesture = await tester.createGesture();
TestGesture gesture2 = await tester.createGesture();
addTearDown(gesture2.removePointer);
await gesture.down(scaleStart1);
await gesture2.down(scaleStart2);
await tester.pump();
await gesture.moveTo(scaleEnd1);
await gesture2.moveTo(scaleEnd2);
await tester.pump();
await gesture.up();
await gesture2.up();
await tester.pumpAndSettle();
expect(transformationController.value, equals(Matrix4.identity()));
expect(initialScale, null);
expect(scale, null);
// Pinch to zoom for a larger amount is detected. It starts smoothly at
// 1.0 despite the fact that the gesture has already moved a bit.
scaleEnd1 = Offset(childInterior.dx - 38.0, childInterior.dy);
scaleEnd2 = Offset(childInterior.dx + 48.0, childInterior.dy);
gesture = await tester.createGesture();
gesture2 = await tester.createGesture();
addTearDown(gesture2.removePointer);
await gesture.down(scaleStart1);
await gesture2.down(scaleStart2);
await tester.pump();
await gesture.moveTo(scaleEnd1);
await gesture2.moveTo(scaleEnd2);
await tester.pump();
await gesture.up();
await gesture2.up();
await tester.pumpAndSettle();
expect(initialScale, 1.0);
expect(scale, greaterThan(1.0));
expect(transformationController.value.getMaxScaleOnAxis(), greaterThan(1.0));
});
testWidgets('Check if ClipRect is present in the tree', (WidgetTester tester) async {
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: InteractiveViewer(
constrained: false,
clipBehavior: Clip.none,
minScale: 1.0,
maxScale: 1.0,
child: const SizedBox(width: 200.0, height: 200.0),
),
),
),
),
);
final RenderClipRect renderClip = tester.allRenderObjects.whereType<RenderClipRect>().first;
expect(renderClip.clipBehavior, equals(Clip.none));
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: InteractiveViewer(
constrained: false,
minScale: 1.0,
maxScale: 1.0,
child: const SizedBox(width: 200.0, height: 200.0),
),
),
),
),
);
expect(
find.byType(ClipRect),
findsOneWidget,
);
});
testWidgets('builder can change widgets that are off-screen', (WidgetTester tester) async {
final TransformationController transformationController = TransformationController();
const double childHeight = 10.0;
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: SizedBox(
height: 50.0,
child: InteractiveViewer.builder(
transformationController: transformationController,
scaleEnabled: false,
boundaryMargin: const EdgeInsets.all(double.infinity),
// Build visible children green, off-screen children red.
builder: (BuildContext context, Quad viewportQuad) {
final Rect viewport = _axisAlignedBoundingBox(viewportQuad);
final List<Container> children = <Container>[];
for (int i = 0; i < 10; i++) {
final double childTop = i * childHeight;
final double childBottom = childTop + childHeight;
final bool visible = (childBottom >= viewport.top && childBottom <= viewport.bottom)
|| (childTop >= viewport.top && childTop <= viewport.bottom);
children.add(Container(
height: childHeight,
color: visible ? Colors.green : Colors.red,
));
}
return Column(
children: children,
);
},
),
),
),
),
),
);
expect(transformationController.value, equals(Matrix4.identity()));
// The first six are partially visible and therefore green.
int i = 0;
for (final Element element in find.byType(Container, skipOffstage: false).evaluate()) {
final Container container = element.widget as Container;
if (i < 6) {
expect(container.color, Colors.green);
} else {
expect(container.color, Colors.red);
}
i++;
}
// Drag to pan down past the first child.
final Offset childOffset = tester.getTopLeft(find.byType(SizedBox));
const double translationY = 15.0;
final Offset childInterior = Offset(
childOffset.dx,
childOffset.dy + translationY,
);
final TestGesture gesture = await tester.startGesture(childInterior);
await tester.pump();
await gesture.moveTo(childOffset);
await tester.pump();
await gesture.up();
await tester.pumpAndSettle();
expect(transformationController.value, isNot(Matrix4.identity()));
expect(transformationController.value.getTranslation().y, -translationY);
// After scrolling down a bit, the first child is not visible, the next
// six are, and the final three are not.
i = 0;
for (final Element element in find.byType(Container, skipOffstage: false).evaluate()) {
final Container container = element.widget as Container;
if (i > 0 && i < 7) {
expect(container.color, Colors.green);
} else {
expect(container.color, Colors.red);
}
i++;
}
});
// Accessing the intrinsic size of a LayoutBuilder throws an error, so
// InteractiveViewer only uses a LayoutBuilder when it's needed by
// InteractiveViewer.builder.
testWidgets('LayoutBuilder is only used for InteractiveViewer.builder', (WidgetTester tester) async {
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: InteractiveViewer(
child: const SizedBox(width: 200.0, height: 200.0),
),
),
),
),
);
expect(find.byType(LayoutBuilder), findsNothing);
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: InteractiveViewer.builder(
builder: (BuildContext context, Quad viewport) {
return const SizedBox(width: 200.0, height: 200.0);
},
),
),
),
),
);
expect(find.byType(LayoutBuilder), findsOneWidget);
});
testWidgets('scaleFactor', (WidgetTester tester) async {
const double scrollAmount = 30.0;
final TransformationController transformationController = TransformationController();
Future<void> pumpScaleFactor(double scaleFactor) {
return tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: InteractiveViewer(
boundaryMargin: const EdgeInsets.all(double.infinity),
transformationController: transformationController,
scaleFactor: scaleFactor,
child: const SizedBox(width: 200.0, height: 200.0),
),
),
),
),
);
}
// Start with the default scaleFactor.
await pumpScaleFactor(200.0);
expect(transformationController.value, equals(Matrix4.identity()));
// Zoom out. The scale decreases.
final Offset center = tester.getCenter(find.byType(InteractiveViewer));
await scrollAt(center, tester, const Offset(0.0, scrollAmount));
await tester.pumpAndSettle();
final double scaleZoomedOut = transformationController.value.getMaxScaleOnAxis();
expect(scaleZoomedOut, lessThan(1.0));
// Zoom in. The scale increases.
await scrollAt(center, tester, const Offset(0.0, -scrollAmount));
await tester.pumpAndSettle();
final double scaleZoomedIn = transformationController.value.getMaxScaleOnAxis();
expect(scaleZoomedIn, greaterThan(scaleZoomedOut));
// Reset and decrease the scaleFactor below the default, so that scaling
// will happen more quickly.
transformationController.value = Matrix4.identity();
await pumpScaleFactor(100.0);
// Zoom out. The scale decreases more quickly than with the default
// (higher) scaleFactor.
await scrollAt(center, tester, const Offset(0.0, scrollAmount));
await tester.pumpAndSettle();
final double scaleLowZoomedOut = transformationController.value.getMaxScaleOnAxis();
expect(scaleLowZoomedOut, lessThan(1.0));
expect(scaleLowZoomedOut, lessThan(scaleZoomedOut));
// Zoom in. The scale increases more quickly than with the default
// (higher) scaleFactor.
await scrollAt(center, tester, const Offset(0.0, -scrollAmount));
await tester.pumpAndSettle();
final double scaleLowZoomedIn = transformationController.value.getMaxScaleOnAxis();
expect(scaleLowZoomedIn, greaterThan(scaleLowZoomedOut));
expect(scaleLowZoomedIn - scaleLowZoomedOut, greaterThan(scaleZoomedIn - scaleZoomedOut));
// Reset and increase the scaleFactor above the default.
transformationController.value = Matrix4.identity();
await pumpScaleFactor(400.0);
// Zoom out. The scale decreases, but not by as much as with the default
// (higher) scaleFactor.
await scrollAt(center, tester, const Offset(0.0, scrollAmount));
await tester.pumpAndSettle();
final double scaleHighZoomedOut = transformationController.value.getMaxScaleOnAxis();
expect(scaleHighZoomedOut, lessThan(1.0));
expect(scaleHighZoomedOut, greaterThan(scaleZoomedOut));
// Zoom in. The scale increases, but not by as much as with the default
// (higher) scaleFactor.
await scrollAt(center, tester, const Offset(0.0, -scrollAmount));
await tester.pumpAndSettle();
final double scaleHighZoomedIn = transformationController.value.getMaxScaleOnAxis();
expect(scaleHighZoomedIn, greaterThan(scaleHighZoomedOut));
expect(scaleHighZoomedIn - scaleHighZoomedOut, lessThan(scaleZoomedIn - scaleZoomedOut));
});
testWidgets('alignment argument is used properly', (WidgetTester tester) async {
const Alignment alignment = Alignment.center;
await tester.pumpWidget(MaterialApp(
home: Scaffold(
body: InteractiveViewer(
alignment: alignment,
child: Container(),
),
),
));
final Transform transform = tester.firstWidget(find.byType(Transform));
expect(transform.alignment, alignment);
});
testWidgets('interactionEndFrictionCoefficient', (WidgetTester tester) async {
// Use the default interactionEndFrictionCoefficient.
final TransformationController transformationController1 = TransformationController();
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: SizedBox(
width: 200,
height: 200,
child: InteractiveViewer(
constrained: false,
transformationController: transformationController1,
child: const SizedBox(width: 2000.0, height: 2000.0),
),
),
),
),
);
expect(transformationController1.value, equals(Matrix4.identity()));
await tester.flingFrom(const Offset(100, 100), const Offset(0, -50), 100.0);
await tester.pumpAndSettle();
final Vector3 translation1 = transformationController1.value.getTranslation();
expect(translation1.y, lessThan(-58.0));
// Next try a custom interactionEndFrictionCoefficient.
final TransformationController transformationController2 = TransformationController();
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: SizedBox(
width: 200,
height: 200,
child: InteractiveViewer(
constrained: false,
interactionEndFrictionCoefficient: 0.01,
transformationController: transformationController2,
child: const SizedBox(width: 2000.0, height: 2000.0),
),
),
),
),
);
expect(transformationController2.value, equals(Matrix4.identity()));
await tester.flingFrom(const Offset(100, 100), const Offset(0, -50), 100.0);
await tester.pumpAndSettle();
final Vector3 translation2 = transformationController2.value.getTranslation();
// The coefficient 0.01 is greater than the default of 0.0000135,
// so the translation comes to a stop more quickly.
expect(translation2.y, lessThan(translation1.y));
});
testWidgets('discrete scroll pointer events', (WidgetTester tester) async {
final TransformationController transformationController = TransformationController();
const double boundaryMargin = 50.0;
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: InteractiveViewer(
boundaryMargin: const EdgeInsets.all(boundaryMargin),
transformationController: transformationController,
child: const SizedBox(width: 200.0, height: 200.0),
),
),
),
),
);
expect(transformationController.value.getMaxScaleOnAxis(), 1.0);
Vector3 translation = transformationController.value.getTranslation();
expect(translation.x, 0);
expect(translation.y, 0);
// Send a mouse scroll event, it should cause a scale.
final TestPointer mouse = TestPointer(1, PointerDeviceKind.mouse);
await tester.sendEventToBinding(mouse.hover(tester.getCenter(find.byType(SizedBox))));
await tester.sendEventToBinding(mouse.scroll(const Offset(300, -200)));
await tester.pump();
expect(transformationController.value.getMaxScaleOnAxis(), 2.5);
translation = transformationController.value.getTranslation();
// Will be translated to maintain centering.
expect(translation.x, -150);
expect(translation.y, -150);
// Send a trackpad scroll event, it should cause a pan and no scale.
final TestPointer trackpad = TestPointer(1, PointerDeviceKind.trackpad);
await tester.sendEventToBinding(trackpad.hover(tester.getCenter(find.byType(SizedBox))));
await tester.sendEventToBinding(trackpad.scroll(const Offset(100, -25)));
await tester.pump();
expect(transformationController.value.getMaxScaleOnAxis(), 2.5);
translation = transformationController.value.getTranslation();
expect(translation.x, -250);
expect(translation.y, -125);
});
testWidgets('discrete scale pointer event', (WidgetTester tester) async {
final TransformationController transformationController = TransformationController();
const double boundaryMargin = 50.0;
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: InteractiveViewer(
boundaryMargin: const EdgeInsets.all(boundaryMargin),
transformationController: transformationController,
child: const SizedBox(width: 200.0, height: 200.0),
),
),
),
),
);
expect(transformationController.value.getMaxScaleOnAxis(), 1.0);
// Send a scale event.
final TestPointer pointer = TestPointer(1, PointerDeviceKind.trackpad);
await tester.sendEventToBinding(pointer.hover(tester.getCenter(find.byType(SizedBox))));
await tester.sendEventToBinding(pointer.scale(1.5));
await tester.pump();
expect(transformationController.value.getMaxScaleOnAxis(), 1.5);
// Send another scale event.
await tester.sendEventToBinding(pointer.scale(1.5));
await tester.pump();
expect(transformationController.value.getMaxScaleOnAxis(), 2.25);
// Send another scale event.
await tester.sendEventToBinding(pointer.scale(1.5));
await tester.pump();
expect(transformationController.value.getMaxScaleOnAxis(), 2.5); // capped at maxScale (2.5)
});
});
group('getNearestPointOnLine', () {
test('does not modify parameters', () {
final Vector3 point = Vector3(5.0, 5.0, 0.0);
final Vector3 a = Vector3(0.0, 0.0, 0.0);
final Vector3 b = Vector3(10.0, 0.0, 0.0);
final Vector3 closestPoint = InteractiveViewer.getNearestPointOnLine(point, a , b);
expect(closestPoint, Vector3(5.0, 0.0, 0.0));
expect(point, Vector3(5.0, 5.0, 0.0));
expect(a, Vector3(0.0, 0.0, 0.0));
expect(b, Vector3(10.0, 0.0, 0.0));
});
test('simple example', () {
final Vector3 point = Vector3(0.0, 5.0, 0.0);
final Vector3 a = Vector3(0.0, 0.0, 0.0);
final Vector3 b = Vector3(5.0, 5.0, 0.0);
expect(InteractiveViewer.getNearestPointOnLine(point, a, b), Vector3(2.5, 2.5, 0.0));
});
test('closest to a', () {
final Vector3 point = Vector3(-1.0, -1.0, 0.0);
final Vector3 a = Vector3(0.0, 0.0, 0.0);
final Vector3 b = Vector3(5.0, 5.0, 0.0);
expect(InteractiveViewer.getNearestPointOnLine(point, a, b), a);
});
test('closest to b', () {
final Vector3 point = Vector3(6.0, 6.0, 0.0);
final Vector3 a = Vector3(0.0, 0.0, 0.0);
final Vector3 b = Vector3(5.0, 5.0, 0.0);
expect(InteractiveViewer.getNearestPointOnLine(point, a, b), b);
});
test('point already on the line returns the point', () {
final Vector3 point = Vector3(2.0, 2.0, 0.0);
final Vector3 a = Vector3(0.0, 0.0, 0.0);
final Vector3 b = Vector3(5.0, 5.0, 0.0);
expect(InteractiveViewer.getNearestPointOnLine(point, a, b), point);
});
test('real example', () {
final Vector3 point = Vector3(-436.9, 433.6, 0.0);
final Vector3 a = Vector3(-1114.0, -60.3, 0.0);
final Vector3 b = Vector3(288.8, 432.7, 0.0);
final Vector3 closestPoint = InteractiveViewer.getNearestPointOnLine(point, a , b);
expect(closestPoint.x, moreOrLessEquals(-356.8, epsilon: 0.1));
expect(closestPoint.y, moreOrLessEquals(205.8, epsilon: 0.1));
});
});
group('getAxisAlignedBoundingBox', () {
test('rectangle already axis aligned returns the rectangle', () {
final Quad quad = Quad.points(
Vector3(0.0, 0.0, 0.0),
Vector3(10.0, 0.0, 0.0),
Vector3(10.0, 10.0, 0.0),
Vector3(0.0, 10.0, 0.0),
);
final Quad aabb = InteractiveViewer.getAxisAlignedBoundingBox(quad);
expect(aabb.point0, quad.point0);
expect(aabb.point1, quad.point1);
expect(aabb.point2, quad.point2);
expect(aabb.point3, quad.point3);
});
test('rectangle rotated by 45 degrees', () {
final Quad quad = Quad.points(
Vector3(0.0, 5.0, 0.0),
Vector3(5.0, 10.0, 0.0),
Vector3(10.0, 5.0, 0.0),
Vector3(5.0, 0.0, 0.0),
);
final Quad aabb = InteractiveViewer.getAxisAlignedBoundingBox(quad);
expect(aabb.point0, Vector3(0.0, 0.0, 0.0));
expect(aabb.point1, Vector3(10.0, 0.0, 0.0));
expect(aabb.point2, Vector3(10.0, 10.0, 0.0));
expect(aabb.point3, Vector3(0.0, 10.0, 0.0));
});
test('rectangle rotated very slightly', () {
final Quad quad = Quad.points(
Vector3(0.0, 1.0, 0.0),
Vector3(1.0, 11.0, 0.0),
Vector3(11.0, 9.0, 0.0),
Vector3(9.0, -1.0, 0.0),
);
final Quad aabb = InteractiveViewer.getAxisAlignedBoundingBox(quad);
expect(aabb.point0, Vector3(0.0, -1.0, 0.0));
expect(aabb.point1, Vector3(11.0, -1.0, 0.0));
expect(aabb.point2, Vector3(11.0, 11.0, 0.0));
expect(aabb.point3, Vector3(0.0, 11.0, 0.0));
});
test('example from hexagon board', () {
final Quad quad = Quad.points(
Vector3(-462.7, 165.9, 0.0),
Vector3(690.6, -576.7, 0.0),
Vector3(1188.1, 196.0, 0.0),
Vector3(34.9, 938.6, 0.0),
);
final Quad aabb = InteractiveViewer.getAxisAlignedBoundingBox(quad);
expect(aabb.point0, Vector3(-462.7, -576.7, 0.0));
expect(aabb.point1, Vector3(1188.1, -576.7, 0.0));
expect(aabb.point2, Vector3(1188.1, 938.6, 0.0));
expect(aabb.point3, Vector3(-462.7, 938.6, 0.0));
});
});
group('pointIsInside', () {
test('inside', () {
final Quad quad = Quad.points(
Vector3(0.0, 0.0, 0.0),
Vector3(0.0, 10.0, 0.0),
Vector3(10.0, 10.0, 0.0),
Vector3(10.0, 0.0, 0.0),
);
final Vector3 point = Vector3(5.0, 5.0, 0.0);
expect(InteractiveViewer.pointIsInside(point, quad), true);
});
test('outside', () {
final Quad quad = Quad.points(
Vector3(0.0, 0.0, 0.0),
Vector3(0.0, 10.0, 0.0),
Vector3(10.0, 10.0, 0.0),
Vector3(10.0, 0.0, 0.0),
);
final Vector3 point = Vector3(12.0, 0.0, 0.0);
expect(InteractiveViewer.pointIsInside(point, quad), false);
});
test('on the edge', () {
final Quad quad = Quad.points(
Vector3(0.0, 0.0, 0.0),
Vector3(0.0, 10.0, 0.0),
Vector3(10.0, 10.0, 0.0),
Vector3(10.0, 0.0, 0.0),
);
final Vector3 point = Vector3(0.0, 0.0, 0.0);
expect(InteractiveViewer.pointIsInside(point, quad), true);
});
});
group('getNearestPointInside', () {
test('point already inside quad', () {
final Vector3 point = Vector3(5.0, 5.0, 0.0);
final Quad quad = Quad.points(
Vector3(0.0, 0.0, 0.0),
Vector3(0.0, 10.0, 0.0),
Vector3(10.0, 10.0, 0.0),
Vector3(10.0, 0.0, 0.0),
);
final Vector3 nearestPoint = InteractiveViewer.getNearestPointInside(point, quad);
expect(nearestPoint, point);
});
test('axis aligned quad', () {
final Vector3 point = Vector3(5.0, 15.0, 0.0);
final Quad quad = Quad.points(
Vector3(0.0, 0.0, 0.0),
Vector3(0.0, 10.0, 0.0),
Vector3(10.0, 10.0, 0.0),
Vector3(10.0, 0.0, 0.0),
);
final Vector3 nearestPoint = InteractiveViewer.getNearestPointInside(point, quad);
expect(nearestPoint, Vector3(5.0, 10.0, 0.0));
});
test('not axis aligned quad', () {
final Vector3 point = Vector3(5.0, 15.0, 0.0);
final Quad quad = Quad.points(
Vector3(0.0, 0.0, 0.0),
Vector3(2.0, 10.0, 0.0),
Vector3(12.0, 12.0, 0.0),
Vector3(10.0, 2.0, 0.0),
);
final Vector3 nearestPoint = InteractiveViewer.getNearestPointInside(point, quad);
expect(nearestPoint.x, moreOrLessEquals(5.8, epsilon: 0.1));
expect(nearestPoint.y, moreOrLessEquals(10.8, epsilon: 0.1));
});
});
}
Rect _axisAlignedBoundingBox(Quad quad) {
double? xMin;
double? xMax;
double? yMin;
double? yMax;
for (final Vector3 point in <Vector3>[quad.point0, quad.point1, quad.point2, quad.point3]) {
if (xMin == null || point.x < xMin) {
xMin = point.x;
}
if (xMax == null || point.x > xMax) {
xMax = point.x;
}
if (yMin == null || point.y < yMin) {
yMin = point.y;
}
if (yMax == null || point.y > yMax) {
yMax = point.y;
}
}
return Rect.fromLTRB(xMin!, yMin!, xMax!, yMax!);
}