Initial commit

.gitignore

+.DS_Store
+.dart_tool/
+
+.packages
+.pub/
+
+build/
+ios/.generated/
+ios/Flutter/Generated.xcconfig
+ios/Runner/GeneratedPluginRegistrant.*
+
+*.log

.idea/codeStyles/Project.xml

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+  <code_scheme name="Project" version="173">
+    <Objective-C-extensions>
+      <file>
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Import" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Macro" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Typedef" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Enum" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Constant" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Global" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Struct" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="FunctionPredecl" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Function" />
+      </file>
+      <class>
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Property" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Synthesize" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="InitMethod" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="StaticMethod" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="InstanceMethod" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="DeallocMethod" />
+      </class>
+      <extensions>
+        <pair source="cpp" header="h" fileNamingConvention="NONE" />
+        <pair source="c" header="h" fileNamingConvention="NONE" />
+      </extensions>
+    </Objective-C-extensions>
+  </code_scheme>
+</component>
\ No newline at end of file

.idea/libraries/Dart_SDK.xml

+<component name="libraryTable">
+  <library name="Dart SDK">
+    <CLASSES>
+      <root url="file://$USER_HOME$/working/flutter/bin/cache/dart-sdk/lib/async" />
+      <root url="file://$USER_HOME$/working/flutter/bin/cache/dart-sdk/lib/cli" />
+      <root url="file://$USER_HOME$/working/flutter/bin/cache/dart-sdk/lib/collection" />
+      <root url="file://$USER_HOME$/working/flutter/bin/cache/dart-sdk/lib/convert" />
+      <root url="file://$USER_HOME$/working/flutter/bin/cache/dart-sdk/lib/core" />
+      <root url="file://$USER_HOME$/working/flutter/bin/cache/dart-sdk/lib/developer" />
+      <root url="file://$USER_HOME$/working/flutter/bin/cache/dart-sdk/lib/html" />
+      <root url="file://$USER_HOME$/working/flutter/bin/cache/dart-sdk/lib/indexed_db" />
+      <root url="file://$USER_HOME$/working/flutter/bin/cache/dart-sdk/lib/io" />
+      <root url="file://$USER_HOME$/working/flutter/bin/cache/dart-sdk/lib/isolate" />
+      <root url="file://$USER_HOME$/working/flutter/bin/cache/dart-sdk/lib/js" />
+      <root url="file://$USER_HOME$/working/flutter/bin/cache/dart-sdk/lib/js_util" />
+      <root url="file://$USER_HOME$/working/flutter/bin/cache/dart-sdk/lib/math" />
+      <root url="file://$USER_HOME$/working/flutter/bin/cache/dart-sdk/lib/mirrors" />
+      <root url="file://$USER_HOME$/working/flutter/bin/cache/dart-sdk/lib/svg" />
+      <root url="file://$USER_HOME$/working/flutter/bin/cache/dart-sdk/lib/typed_data" />
+      <root url="file://$USER_HOME$/working/flutter/bin/cache/dart-sdk/lib/web_audio" />
+      <root url="file://$USER_HOME$/working/flutter/bin/cache/dart-sdk/lib/web_gl" />
+      <root url="file://$USER_HOME$/working/flutter/bin/cache/dart-sdk/lib/web_sql" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES />
+  </library>
+</component>
\ No newline at end of file

.idea/libraries/Flutter_Plugins.xml

+<component name="libraryTable">
+  <library name="Flutter Plugins" type="FlutterPluginsLibraryType">
+    <CLASSES />
+    <JAVADOC />
+    <SOURCES />
+  </library>
+</component>
\ No newline at end of file

.idea/misc.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="NullableNotNullManager">
+    <option name="myDefaultNullable" value="android.support.annotation.Nullable" />
+    <option name="myDefaultNotNull" value="android.support.annotation.NonNull" />
+    <option name="myNullables">
+      <value>
+        <list size="4">
+          <item index="0" class="java.lang.String" itemvalue="org.jetbrains.annotations.Nullable" />
+          <item index="1" class="java.lang.String" itemvalue="javax.annotation.Nullable" />
+          <item index="2" class="java.lang.String" itemvalue="edu.umd.cs.findbugs.annotations.Nullable" />
+          <item index="3" class="java.lang.String" itemvalue="android.support.annotation.Nullable" />
+        </list>
+      </value>
+    </option>
+    <option name="myNotNulls">
+      <value>
+        <list size="4">
+          <item index="0" class="java.lang.String" itemvalue="org.jetbrains.annotations.NotNull" />
+          <item index="1" class="java.lang.String" itemvalue="javax.annotation.Nonnull" />
+          <item index="2" class="java.lang.String" itemvalue="edu.umd.cs.findbugs.annotations.NonNull" />
+          <item index="3" class="java.lang.String" itemvalue="android.support.annotation.NonNull" />
+        </list>
+      </value>
+    </option>
+  </component>
+</project>
\ No newline at end of file

.idea/modules.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/transformer_page_view.iml" filepath="$PROJECT_DIR$/transformer_page_view.iml" />
+    </modules>
+  </component>
+</project>

.idea/vcs.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file

.travis.yml

+language: dart
+env:
+  - SHARD=dartfmt
+  - SHARD=test
+install:
+  - ./dev/bots/travis_install.sh
+script:
+  - ./dev/bots/travis_script.sh
+after_success:
+  - coveralls-lcov coverage/lcov.info
\ No newline at end of file

CHANGELOG.md

+## [0.1.6] - [2019.03.22]
+
+    * Fix setState() called after dispose()
+
+## [0.1.5] - [2019.03.10]
+
+    * Fix findRenderObject is null
+
+## [0.1.4] - [2018.10.19]
+    * Fix display items when itemCount changes
+
+## [0.1.3] - [2018.10.18]
+    * Fix zero item count
+
+## [0.1.1] - [2018.10.10]
+    * Fix next/previous index in none loop mode.
+
+## [0.1.0] - [2018.10.08]
+    * Implement `TransformerPageController`
+
+## [0.0.8] - [2018.09.20]
+    * Ignore not valid event
+
+## [0.0.7] - [2018.09.20]
+    * Fix bugs
+
+## [0.0.6] - [2018.09.20]
+    * Fix bugs
+
+## [0.0.5] - [2018.09.19]
+    * Fix bugs
+    
+## [0.0.4] - [2018.09.19]
+    * Fix bugs
+    
+## [0.0.2] - [2018.08.30]
+    * Update readme
+
+## [0.0.1] - [2018.08.30]
+    * Basic animation
+    
+

LICENSE

+TODO: Add your license here.

README.md

+
+<p align="center">
+    <a href="https://travis-ci.org/best-flutter/transformer_page_view">
+        <img src="https://travis-ci.org/best-flutter/transformer_page_view.svg?branch=master" alt="Build Status" />
+    </a>
+    <a href="https://github.com/best-flutter/transformer_page_view/pulls">
+        <img src="https://img.shields.io/badge/PRs-Welcome-brightgreen.svg" alt="PRs Welcome" />
+    </a>
+    <a href="https://pub.dartlang.org/packages/transformer_page_view">
+        <img src="https://img.shields.io/pub/v/transformer_page_view.svg" alt="pub package" />
+    </a>
+    
+</p>
+
+# transformer_page_view
+
+PageTransformer for flutter
+
+
+## Very simple to use
+
+
+```
+import 'package:transformer_page_view/transformer_page_view.dart';
+
+...
+
+new TransformerPageView(
+loop: true,
+transformer: new AccordionTransformer(),
+itemBuilder: (BuildContext context, int index) {
+  return new Container(
+    color: list[index%list.length],
+    child: new Center(
+      child: new Text("$index",style: new TextStyle(fontSize: 80.0,color: Colors.white),),
+    ),
+  );
+},
+itemCount: 3)
+```
+
+Almost the same as PageView.builder, simplely specify a `transformer` to `TransformerPageView`, 
+    which is a sub class of `PageTransformer`
+
+
+## Show cases
+
+### Parallax
+
+![Welcome view](https://github.com/jzoom/images/raw/master/welcome.gif)
+
+
+### Basic
+
+![AccordionTransformer](https://github.com/jzoom/images/raw/master/AccordionTransformer.gif)
+
+>See code [here](https://github.com/best-flutter/transformer_page_view/blob/master/example/lib/AccordionTransformer.dart)
+
+![ThreeDTransformer](https://github.com/jzoom/images/raw/master/ThreeDTransformer.gif)
+
+>See code [here](https://github.com/best-flutter/transformer_page_view/blob/master/example/lib/ThreeDTransformer.dart)
+
+
+![ScaleAndFadeTransformer](https://github.com/jzoom/images/raw/master/ScaleAndFadeTransformer.gif)
+
+>See code [here](https://github.com/best-flutter/transformer_page_view/blob/master/example/lib/ScaleAndFadeTransformers.dart)
+
+
+![ZoomInPageTransformer](https://github.com/jzoom/images/raw/master/ZoomInPageTransformer.gif)
+
+>See code [here](https://github.com/best-flutter/transformer_page_view/blob/master/example/lib/ZoomInPageTransformer.dart)
+
+
+![ZoomOutPageTransformer](https://github.com/jzoom/images/raw/master/ZoomOutPageTransformer.gif)
+
+>See code [here](https://github.com/best-flutter/transformer_page_view/blob/master/example/lib/ZoomOutPageTransformer.dart)
+
+
+![DepthPageTransformer](https://github.com/jzoom/images/raw/master/DepthPageTransformer.gif)
+
+>See code [here](https://github.com/best-flutter/transformer_page_view/blob/master/example/lib/DepthPageTransformers.dart)
+
+
+
+
+
+## Getting Started
+
+- [Installation](#installation)
+- [Basic Usage](#basic-usage)
+- [Build-in Parallax](#build-in-parallax)
+- [Custom animation](#custom-animation)
+
+
+### Installation
+
+Add 
+
+```bash
+
+transformer_page_view:
+
+```
+to your pubspec.yaml ,and run 
+
+```bash
+flutter packages get 
+```
+in your project's root directory.
+
+
+### Basic Usage
+
+
+| Parameter  | Default   | Description |
+| :------------ |:---------------:| :-----|
+| scrollDirection | Axis.horizontal  | If `Axis.horizontal`, the scroll view's children are arranged horizontally in a row instead of vertically in a column. |
+| loop | false |Set to `true` to enable continuous loop mode. |
+| index | none |  Index number of initial slide. if not set , it is controlled by the widget itself,otherwise, it is controlled by another widget, which is returned by `itemBuilder`|
+| onPageChanged | void onPageChanged(int index)  | Called with the new index when the user swiped |
+| duration | new Duration(milliseconds:300) | The milliseconds of every transaction animation costs  |
+| transformer | none | The most important property of this widget, it returns a `transformed` widget that based on the widget parameter. If the value is null, a `itemBuilder` must be specified |
+| itemCount | none | Number of the total items  |
+| itemBuilder | none | A function that returns a widget based on index,if it's null,a `transformer` must be specified |
+
+
+### Build-in Parallax
+
+We provide 3 build-in parallaxes, which handle color、image and container
+
+> ParallaxColor
+
+ParallaxColor handles the color transform, which controls the color transform from one to another. 
+
+> ParallaxImage
+
+ParallaxImage handles the image, which speed is slower than the `PageView`
+
+> ParallaxContainer
+
+ParallaxContainer handles the text or other staff, which speed is faster than the `PageView`
+
+3 build-in parallaxes are all used in subclass of `PageTransform`,group these parallaxes together, we can create very cool things.
+
+![](https://github.com/jzoom/images/raw/master/beauty.gif)
+
+Inspired by [page-transformer](https://github.com/roughike/page-transformer), and we have an easier way to create this.
+
+>See code [here](https://github.com/best-flutter/transformer_page_view/blob/master/example/lib/images.dart)
+
+### Custom animation
+
+
+
+
+
+
+
+

dev/bots/travis_install.sh

+#!/bin/bash
+
+echo "$PWD"
+export ROOT="$PWD"
+
+mkdir ~/development
+
+cd ~/development
+wget https://storage.googleapis.com/flutter_infra/releases/beta/linux/flutter_linux_v0.6.0-beta.tar.xz
+tar xf ~/development/flutter_linux_v0.6.0-beta.tar.xz
+
+export PATH=~/development/flutter/bin:$PATH
+
+
+cd $ROOT
+flutter packages get
+
+gem install coveralls-lcov

dev/bots/travis_script.sh

+#!/bin/bash
+set -ex
+
+export PATH=~/development/flutter/bin:$PATH
+export ROOT="$PWD"
+
+if [[ "$SHARD" == "dartfmt" ]]; then
+ echo 'Formating code'
+ cd $ROOT
+ flutter format . || exit $?
+else
+  # tests shard
+  cd $ROOT
+
+  flutter test --coverage test/* || exit $?
+
+fi

lib/index_controller.dart

+import 'dart:async';
+
+import 'package:flutter/foundation.dart';
+import 'package:flutter/widgets.dart';
+
+class IndexController extends ChangeNotifier {
+  static const int NEXT = 1;
+  static const int PREVIOUS = -1;
+  static const int MOVE = 0;
+
+  late Completer _completer;
+
+  int? index;
+  late bool animation;
+  int? event;
+
+  Future move(int index, {bool animation: true}) {
+    this.animation = animation;
+    this.index = index;
+    this.event = MOVE;
+    _completer = new Completer();
+    notifyListeners();
+    return _completer.future;
+  }
+
+  Future next({bool animation: true}) {
+    this.event = NEXT;
+    this.animation = animation;
+    _completer = new Completer();
+    notifyListeners();
+    return _completer.future;
+  }
+
+  Future previous({bool animation: true}) {
+    this.event = PREVIOUS;
+    this.animation = animation;
+    _completer = new Completer();
+    notifyListeners();
+    return _completer.future;
+  }
+
+  void complete() {
+    if (!_completer.isCompleted) {
+      _completer.complete();
+    }
+  }
+}

lib/parallax.dart

+import 'package:flutter/widgets.dart';
+import 'package:transformer_page_view/transformer_page_view.dart';
+
+typedef void PaintCallback(Canvas canvas, Size siz);
+
+class ColorPainter extends CustomPainter {
+  final Paint _paint;
+  final TransformInfo info;
+  final List<Color> colors;
+
+  ColorPainter(this._paint, this.info, this.colors);
+
+  @override
+  void paint(Canvas canvas, Size size) {
+    int index = info.fromIndex!;
+    _paint.color = colors[index];
+    canvas.drawRect(
+        new Rect.fromLTWH(0.0, 0.0, size.width, size.height), _paint);
+    if (info.done!) {
+      return;
+    }
+    int alpha;
+    int color;
+    double opacity;
+    double? position = info.position;
+    if (info.forward!) {
+      if (index < colors.length - 1) {
+        color = colors[index + 1].value & 0x00ffffff;
+        opacity = (position! <= 0
+            ? (-position / info.viewportFraction!)
+            : 1 - position / info.viewportFraction!);
+        if (opacity > 1) {
+          opacity -= 1.0;
+        }
+        if (opacity < 0) {
+          opacity += 1.0;
+        }
+        alpha = (0xff * opacity).toInt();
+
+        _paint.color = new Color((alpha << 24) | color);
+        canvas.drawRect(
+            new Rect.fromLTWH(0.0, 0.0, size.width, size.height), _paint);
+      }
+    } else {
+      if (index > 0) {
+        color = colors[index - 1].value & 0x00ffffff;
+        opacity = (position! > 0
+            ? position / info.viewportFraction!
+            : (1 + position / info.viewportFraction!));
+        if (opacity > 1) {
+          opacity -= 1.0;
+        }
+        if (opacity < 0) {
+          opacity += 1.0;
+        }
+        alpha = (0xff * opacity).toInt();
+
+        _paint.color = new Color((alpha << 24) | color);
+        canvas.drawRect(
+            new Rect.fromLTWH(0.0, 0.0, size.width, size.height), _paint);
+      }
+    }
+  }
+
+  @override
+  bool shouldRepaint(ColorPainter oldDelegate) {
+    return oldDelegate.info != info;
+  }
+}
+
+class _ParallaxColorState extends State<ParallaxColor> {
+  Paint paint = new Paint();
+
+  @override
+  Widget build(BuildContext context) {
+    return new CustomPaint(
+      painter: new ColorPainter(paint, widget.info, widget.colors),
+      child: widget.child,
+    );
+  }
+}
+
+class ParallaxColor extends StatefulWidget {
+  final Widget child;
+
+  final List<Color> colors;
+
+  final TransformInfo info;
+
+  ParallaxColor({
+    required this.colors,
+    required this.info,
+    required this.child,
+  });
+
+  @override
+  State<StatefulWidget> createState() {
+    return new _ParallaxColorState();
+  }
+}
+
+class ParallaxContainer extends StatelessWidget {
+  final Widget child;
+  final double position;
+  final double translationFactor;
+  final double opacityFactor;
+
+  ParallaxContainer(
+      {required this.child,
+      required this.position,
+      this.translationFactor: 100.0,
+      this.opacityFactor: 1.0});
+
+  @override
+  Widget build(BuildContext context) {
+    return Opacity(
+      opacity: (1 - position.abs()).clamp(0.0, 1.0) * opacityFactor,
+      child: new Transform.translate(
+        offset: new Offset(position * translationFactor, 0.0),
+        child: child,
+      ),
+    );
+  }
+}
+
+class ParallaxImage extends StatelessWidget {
+  final Image image;
+  final double imageFactor;
+
+  ParallaxImage.asset(String name, {required double position, this.imageFactor: 0.3})
+      : image = Image.asset(name,
+            fit: BoxFit.cover,
+            alignment: FractionalOffset(
+              0.5 + position * imageFactor,
+              0.5,
+            ));
+
+  @override
+  Widget build(BuildContext context) {
+    return image;
+  }
+}

pubspec.lock

+# Generated by pub
+# See https://dart.dev/tools/pub/glossary#lockfile
+packages:
+  archive:
+    dependency: transitive
+    description:
+      name: archive
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "3.1.2"
+  async:
+    dependency: transitive
+    description:
+      name: async
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.8.1"
+  boolean_selector:
+    dependency: transitive
+    description:
+      name: boolean_selector
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.1.0"
+  characters:
+    dependency: transitive
+    description:
+      name: characters
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.1.0"
+  charcode:
+    dependency: transitive
+    description:
+      name: charcode
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.3.1"
+  clock:
+    dependency: transitive
+    description:
+      name: clock
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.1.0"
+  collection:
+    dependency: transitive
+    description:
+      name: collection
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.15.0"
+  crypto:
+    dependency: transitive
+    description:
+      name: crypto
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "3.0.1"
+  fake_async:
+    dependency: transitive
+    description:
+      name: fake_async
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.2.0"
+  file:
+    dependency: transitive
+    description:
+      name: file
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "6.1.2"
+  flutter:
+    dependency: "direct main"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  flutter_driver:
+    dependency: "direct dev"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  flutter_test:
+    dependency: "direct dev"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  fuchsia_remote_debug_protocol:
+    dependency: transitive
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  matcher:
+    dependency: transitive
+    description:
+      name: matcher
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "0.12.10"
+  meta:
+    dependency: transitive
+    description:
+      name: meta
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.7.0"
+  path:
+    dependency: transitive
+    description:
+      name: path
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.8.0"
+  platform:
+    dependency: transitive
+    description:
+      name: platform
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "3.0.0"
+  process:
+    dependency: transitive
+    description:
+      name: process
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "4.2.3"
+  sky_engine:
+    dependency: transitive
+    description: flutter
+    source: sdk
+    version: "0.0.99"
+  source_span:
+    dependency: transitive
+    description:
+      name: source_span
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.8.1"
+  stack_trace:
+    dependency: transitive
+    description:
+      name: stack_trace
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.10.0"
+  stream_channel:
+    dependency: transitive
+    description:
+      name: stream_channel
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.1.0"
+  string_scanner:
+    dependency: transitive
+    description:
+      name: string_scanner
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.1.0"
+  sync_http:
+    dependency: transitive
+    description:
+      name: sync_http
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "0.3.0"
+  term_glyph:
+    dependency: transitive
+    description:
+      name: term_glyph
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.2.0"
+  test_api:
+    dependency: transitive
+    description:
+      name: test_api
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "0.4.2"
+  typed_data:
+    dependency: transitive
+    description:
+      name: typed_data
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.3.0"
+  vector_math:
+    dependency: transitive
+    description:
+      name: vector_math
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.1.0"
+  vm_service:
+    dependency: transitive
+    description:
+      name: vm_service
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "7.1.1"
+  webdriver:
+    dependency: transitive
+    description:
+      name: webdriver
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "3.0.0"
+sdks:
+  dart: ">=2.12.0 <3.0.0"

pubspec.yaml

+name: transformer_page_view
+description: PageTransformer for flutter
+version: 0.1.6
+homepage:  https://github.com/jzoom/transformer_page_view
+
+environment:
+  sdk: '>=2.12.0 <3.0.0'
+
+dependencies:
+  flutter:
+    sdk: flutter
+
+dev_dependencies:
+  flutter_test:
+    sdk: flutter
+  flutter_driver:
+    sdk: flutter
+
+flutter:

test/transformer_page_view_test.dart

+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+import 'package:transformer_page_view/transformer_page_view.dart';
+
+void main() {
+  testWidgets('TransformerPageView basic usage', (WidgetTester tester) async {
+    // Build our app and trigger a frame.
+    await tester.pumpWidget(MaterialApp(
+        home: new TransformerPageView(
+            itemBuilder: (context, index) {
+              return Text("0");
+            },
+            itemCount: 10)));
+
+    expect(find.text("0", skipOffstage: false), findsOneWidget);
+  });
+  testWidgets('Zero item count ', (WidgetTester tester) async {
+    // Build our app and trigger a frame.
+    await tester.pumpWidget(MaterialApp(
+        home: new TransformerPageView(
+            transformer: new PageTransformerBuilder(
+                builder: (Widget child, TransformInfo info) {
+              return new Container(
+                child: new Text("0"),
+              );
+            }),
+            itemCount: 0)));
+
+    expect(find.text("0", skipOffstage: false), findsNothing);
+  });
+  testWidgets('TransformerPageView transformer only',
+      (WidgetTester tester) async {
+    // Build our app and trigger a frame.
+    await tester.pumpWidget(MaterialApp(
+        home: new TransformerPageView(
+            transformer: new PageTransformerBuilder(
+                builder: (Widget child, TransformInfo info) {
+              return new Container(
+                child: new Text("0"),
+              );
+            }),
+            itemCount: 10)));
+
+    // expect(find.text("0", skipOffstage: false), findsOneWidget);
+  });
+
+//  testWidgets('TransformerPageView animations', (WidgetTester tester) async {
+//    // Build our app and trigger a frame.
+//    await tester.pumpWidget(MaterialApp(
+//        home: new TransformerPageView(
+//            transformer: new ScaleAndFadeTransformer(),
+//            itemBuilder: (context, index) {
+//              return Text("0");
+//            },
+//            itemCount: 10)));
+//
+//    expect(find.text("0", skipOffstage: false), findsOneWidget);
+//  });
+//
+//  testWidgets('TransformerPageView animations', (WidgetTester tester) async {
+//    // Build our app and trigger a frame.
+//    await tester.pumpWidget(MaterialApp(
+//        home: new TransformerPageView(
+//            transformer: new AccordionTransformer(),
+//            itemBuilder: (context, index) {
+//              return Text("0");
+//            },
+//            itemCount: 10)));
+//
+//    expect(find.text("0", skipOffstage: false), findsOneWidget);
+//  });
+//
+//  testWidgets('TransformerPageView animations', (WidgetTester tester) async {
+//    // Build our app and trigger a frame.
+//    await tester.pumpWidget(MaterialApp(
+//        home: new TransformerPageView(
+//            transformer: new ZoomInPageTransformer(),
+//            itemBuilder: (context, index) {
+//              return Text("0");
+//            },
+//            itemCount: 10)));
+//
+//    expect(find.text("0", skipOffstage: false), findsOneWidget);
+//  });
+//
+//  testWidgets('TransformerPageView animations', (WidgetTester tester) async {
+//    // Build our app and trigger a frame.
+//    await tester.pumpWidget(MaterialApp(
+//        home: new TransformerPageView(
+//            transformer: new ZoomOutPageTransformer(),
+//            itemBuilder: (context, index) {
+//              return Text("0");
+//            },
+//            itemCount: 10)));
+//
+//    expect(find.text("0", skipOffstage: false), findsOneWidget);
+//  });
+//
+//  testWidgets('TransformerPageView animations', (WidgetTester tester) async {
+//    // Build our app and trigger a frame.
+//    await tester.pumpWidget(MaterialApp(
+//        home: new TransformerPageView(
+//            transformer: new ThreeDTransformer(),
+//            itemBuilder: (context, index) {
+//              return Text("0");
+//            },
+//            itemCount: 10)));
+//
+//    expect(find.text("0", skipOffstage: false), findsOneWidget);
+//  });
+//
+//  testWidgets('TransformerPageView animations', (WidgetTester tester) async {
+//    // Build our app and trigger a frame.
+//    await tester.pumpWidget(MaterialApp(
+//        home: new TransformerPageView(
+//            transformer: new DeepthPageTransformer(),
+//            itemBuilder: (context, index) {
+//              return Text("0");
+//            },
+//            itemCount: 10)));
+//
+//    expect(find.text("0", skipOffstage: false), findsOneWidget);
+//  });
+//
+  testWidgets('TransformerPageView controller', (WidgetTester tester) async {
+    // Build our app and trigger a frame.
+    IndexController controller = new IndexController();
+
+    await tester.pumpWidget(MaterialApp(
+        home: new TransformerPageView(
+            controller: controller,
+            transformer: new FackTransformer(),
+            itemBuilder: (context, index) {
+              print("===================build:$index");
+              return Text("$index");
+            },
+            itemCount: 10)));
+
+    expect(find.text("0"), findsOneWidget);
+    await controller.next(animation: false);
+
+    expect(find.text("0"), findsOneWidget);
+    await controller.previous(animation: false);
+    expect(find.text("0"), findsOneWidget);
+    await controller.move(2, animation: false);
+    expect(find.text("0"), findsOneWidget);
+  });
+}
+
+class FackTransformer extends PageTransformer {
+  @override
+  Widget transform(Widget child, TransformInfo info) {
+    return child;
+  }
+}

transformer_page_view.iml

+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/lib" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/test" isTestSource="true" />
+      <excludeFolder url="file://$MODULE_DIR$/.dart_tool" />
+      <excludeFolder url="file://$MODULE_DIR$/.idea" />
+      <excludeFolder url="file://$MODULE_DIR$/.pub" />
+      <excludeFolder url="file://$MODULE_DIR$/build" />
+      <excludeFolder url="file://$MODULE_DIR$/example/.dart_tool" />
+      <excludeFolder url="file://$MODULE_DIR$/example/.pub" />
+      <excludeFolder url="file://$MODULE_DIR$/example/build" />
+      <excludeFolder url="file://$MODULE_DIR$/example/ios/Flutter/flutter_assets/packages" />
+    </content>
+    <orderEntry type="jdk" jdkName="Android API 25 Platform" jdkType="Android SDK" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="Dart SDK" level="project" />
+    <orderEntry type="library" name="Flutter Plugins" level="project" />
+    <orderEntry type="library" name="Dart Packages" level="project" />
+  </component>
+</module>
\ No newline at end of file