├── example ├── android │ ├── gradle.properties │ ├── gradle │ │ └── wrapper │ │ │ ├── gradle-wrapper.jar │ │ │ └── gradle-wrapper.properties │ ├── app │ │ ├── src │ │ │ └── main │ │ │ │ ├── res │ │ │ │ ├── mipmap-hdpi │ │ │ │ │ └── ic_launcher.png │ │ │ │ ├── mipmap-mdpi │ │ │ │ │ └── ic_launcher.png │ │ │ │ ├── mipmap-xhdpi │ │ │ │ │ └── ic_launcher.png │ │ │ │ ├── mipmap-xxhdpi │ │ │ │ │ └── ic_launcher.png │ │ │ │ ├── mipmap-xxxhdpi │ │ │ │ │ └── ic_launcher.png │ │ │ │ ├── values │ │ │ │ │ └── styles.xml │ │ │ │ └── drawable │ │ │ │ │ └── launch_background.xml │ │ │ │ ├── java │ │ │ │ └── com │ │ │ │ │ └── example │ │ │ │ │ └── example │ │ │ │ │ └── MainActivity.java │ │ │ │ └── AndroidManifest.xml │ │ └── build.gradle │ ├── .gitignore │ ├── settings.gradle │ ├── build.gradle │ ├── gradlew.bat │ └── gradlew ├── ios │ ├── Flutter │ │ ├── Debug.xcconfig │ │ ├── Release.xcconfig │ │ └── AppFrameworkInfo.plist │ ├── Runner │ │ ├── AppDelegate.h │ │ ├── Assets.xcassets │ │ │ ├── LaunchImage.imageset │ │ │ │ ├── LaunchImage.png │ │ │ │ ├── LaunchImage@2x.png │ │ │ │ ├── LaunchImage@3x.png │ │ │ │ ├── README.md │ │ │ │ └── Contents.json │ │ │ └── AppIcon.appiconset │ │ │ │ ├── Icon-App-20x20@1x.png │ │ │ │ ├── Icon-App-20x20@2x.png │ │ │ │ ├── Icon-App-20x20@3x.png │ │ │ │ ├── Icon-App-29x29@1x.png │ │ │ │ ├── Icon-App-29x29@2x.png │ │ │ │ ├── Icon-App-29x29@3x.png │ │ │ │ ├── Icon-App-40x40@1x.png │ │ │ │ ├── Icon-App-40x40@2x.png │ │ │ │ ├── Icon-App-40x40@3x.png │ │ │ │ ├── Icon-App-60x60@2x.png │ │ │ │ ├── Icon-App-60x60@3x.png │ │ │ │ ├── Icon-App-76x76@1x.png │ │ │ │ ├── Icon-App-76x76@2x.png │ │ │ │ ├── Icon-App-1024x1024@1x.png │ │ │ │ ├── Icon-App-83.5x83.5@2x.png │ │ │ │ └── Contents.json │ │ ├── main.m │ │ ├── AppDelegate.m │ │ ├── Base.lproj │ │ │ ├── Main.storyboard │ │ │ └── LaunchScreen.storyboard │ │ └── Info.plist │ ├── Runner.xcworkspace │ │ └── contents.xcworkspacedata │ ├── Runner.xcodeproj │ │ ├── project.xcworkspace │ │ │ └── contents.xcworkspacedata │ │ ├── xcshareddata │ │ │ └── xcschemes │ │ │ │ └── Runner.xcscheme │ │ └── project.pbxproj │ └── .gitignore ├── README.md ├── images │ ├── img1.jpg │ ├── img2.jpg │ ├── img3.jpg │ ├── img4.jpg │ ├── img5.jpg │ ├── img6.jpg │ └── img7.jpg ├── .gitignore ├── .metadata ├── android.iml ├── example.iml ├── pubspec.yaml ├── example_android.iml └── lib │ └── main.dart ├── demo.gif ├── .gitignore ├── pubspec.yaml ├── CHANGELOG.md ├── parallax_image.iml ├── LICENSE ├── README.md └── lib └── parallax_image.dart /example/android/gradle.properties: -------------------------------------------------------------------------------- 1 | org.gradle.jvmargs=-Xmx1536M 2 | -------------------------------------------------------------------------------- /example/ios/Flutter/Debug.xcconfig: -------------------------------------------------------------------------------- 1 | #include "Generated.xcconfig" 2 | -------------------------------------------------------------------------------- /example/ios/Flutter/Release.xcconfig: -------------------------------------------------------------------------------- 1 | #include "Generated.xcconfig" 2 | -------------------------------------------------------------------------------- /demo.gif: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/pulyaevskiy/parallax-image/HEAD/demo.gif -------------------------------------------------------------------------------- /example/README.md: -------------------------------------------------------------------------------- 1 | # Parallax Image Demo 2 | 3 | Example of using `ParallaxImage` widget. 4 | 5 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | .DS_Store 2 | .atom/ 3 | .idea 4 | .packages 5 | .pub/ 6 | packages 7 | pubspec.lock 8 | -------------------------------------------------------------------------------- /example/images/img1.jpg: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/pulyaevskiy/parallax-image/HEAD/example/images/img1.jpg -------------------------------------------------------------------------------- /example/images/img2.jpg: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/pulyaevskiy/parallax-image/HEAD/example/images/img2.jpg -------------------------------------------------------------------------------- /example/images/img3.jpg: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/pulyaevskiy/parallax-image/HEAD/example/images/img3.jpg -------------------------------------------------------------------------------- /example/images/img4.jpg: 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-------------------------------------------------------------------------------- 1 | 2 | 4 | 6 | 7 | 8 | -------------------------------------------------------------------------------- /example/ios/Runner/main.m: -------------------------------------------------------------------------------- 1 | #import 2 | #import 3 | #import "AppDelegate.h" 4 | 5 | int main(int argc, char * argv[]) { 6 | @autoreleasepool { 7 | return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class])); 8 | } 9 | } 10 | -------------------------------------------------------------------------------- /example/android/gradle/wrapper/gradle-wrapper.properties: -------------------------------------------------------------------------------- 1 | #Fri Jun 23 08:50:38 CEST 2017 2 | distributionBase=GRADLE_USER_HOME 3 | distributionPath=wrapper/dists 4 | zipStoreBase=GRADLE_USER_HOME 5 | zipStorePath=wrapper/dists 6 | distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip 7 | -------------------------------------------------------------------------------- /example/.metadata: -------------------------------------------------------------------------------- 1 | # This file tracks properties of this Flutter project. 2 | # Used by Flutter tool to assess capabilities and perform upgrades etc. 3 | # 4 | # This file should be version controlled and should not be manually edited. 5 | 6 | version: 7 | revision: bfc6833459de52bacb55262296f2d51891ab7b85 8 | channel: master 9 | -------------------------------------------------------------------------------- /example/ios/Runner/Assets.xcassets/LaunchImage.imageset/README.md: -------------------------------------------------------------------------------- 1 | # Launch Screen Assets 2 | 3 | You can customize the launch screen with your own desired assets by replacing the image files in this directory. 4 | 5 | You can also do it by opening your Flutter project's Xcode project with `open ios/Runner.xcworkspace`, selecting `Runner/Assets.xcassets` in the Project Navigator and dropping in the desired images. -------------------------------------------------------------------------------- /pubspec.yaml: -------------------------------------------------------------------------------- 1 | name: parallax_image 2 | description: A Flutter widget that paints an image and moves it at a slower speed than the main scrolling content. 3 | version: 0.3.1+1 4 | homepage: https://github.com/pulyaevskiy/parallax-image 5 | author: Anatoly Pulyaevskiy 6 | 7 | environment: 8 | sdk: '>=2.0.0-dev <3.0.0' 9 | 10 | dependencies: 11 | flutter: 12 | sdk: flutter 13 | -------------------------------------------------------------------------------- /example/android/app/src/main/res/values/styles.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 8 | 9 | -------------------------------------------------------------------------------- /example/android/app/src/main/java/com/example/example/MainActivity.java: -------------------------------------------------------------------------------- 1 | package com.example.example; 2 | 3 | import android.os.Bundle; 4 | 5 | import io.flutter.app.FlutterActivity; 6 | import io.flutter.plugins.GeneratedPluginRegistrant; 7 | 8 | public class MainActivity extends FlutterActivity { 9 | @Override 10 | protected void onCreate(Bundle savedInstanceState) { 11 | super.onCreate(savedInstanceState); 12 | GeneratedPluginRegistrant.registerWith(this); 13 | } 14 | } 15 | -------------------------------------------------------------------------------- /example/ios/Runner/AppDelegate.m: -------------------------------------------------------------------------------- 1 | #include "AppDelegate.h" 2 | #include "GeneratedPluginRegistrant.h" 3 | 4 | @implementation AppDelegate 5 | 6 | - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { 7 | [GeneratedPluginRegistrant registerWithRegistry:self]; 8 | // Override point for customization after application launch. 9 | return [super application:application didFinishLaunchingWithOptions:launchOptions]; 10 | } 11 | 12 | @end 13 | -------------------------------------------------------------------------------- /CHANGELOG.md: -------------------------------------------------------------------------------- 1 | ## [0.3.1] 2 | 3 | * Fixed analyzer warnings. 4 | 5 | ## [0.3.0] 6 | 7 | * Enable hit testing so that `ParallaxImage` can be used inside 8 | `GestureDetector`. 9 | 10 | ## [0.2.0+1] 11 | 12 | * Readme updates. 13 | 14 | ## [0.2.0] 15 | 16 | * `controller` argument in `ParallaxImage` constructor is no longer required. 17 | If controller is not specified then `ParallaxImage` looks for nearest 18 | `Scrollable` ancestor and subscribes to scrolling updates on it. 19 | 20 | ## [0.1.0] 21 | 22 | * Initial release 23 | -------------------------------------------------------------------------------- /example/android/app/src/main/res/drawable/launch_background.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 12 | 13 | -------------------------------------------------------------------------------- /example/ios/Runner/Assets.xcassets/LaunchImage.imageset/Contents.json: -------------------------------------------------------------------------------- 1 | { 2 | "images" : [ 3 | { 4 | "idiom" : "universal", 5 | "filename" : "LaunchImage.png", 6 | "scale" : "1x" 7 | }, 8 | { 9 | "idiom" : "universal", 10 | "filename" : "LaunchImage@2x.png", 11 | "scale" : "2x" 12 | }, 13 | { 14 | "idiom" : "universal", 15 | "filename" : "LaunchImage@3x.png", 16 | "scale" : "3x" 17 | } 18 | ], 19 | "info" : { 20 | "version" : 1, 21 | "author" : "xcode" 22 | } 23 | } 24 | -------------------------------------------------------------------------------- /example/android/settings.gradle: -------------------------------------------------------------------------------- 1 | include ':app' 2 | 3 | def flutterProjectRoot = rootProject.projectDir.parentFile.toPath() 4 | 5 | def plugins = new Properties() 6 | def pluginsFile = new File(flutterProjectRoot.toFile(), '.flutter-plugins') 7 | if (pluginsFile.exists()) { 8 | pluginsFile.withReader('UTF-8') { reader -> plugins.load(reader) } 9 | } 10 | 11 | plugins.each { name, path -> 12 | def pluginDirectory = flutterProjectRoot.resolve(path).resolve('android').toFile() 13 | include ":$name" 14 | project(":$name").projectDir = pluginDirectory 15 | } 16 | -------------------------------------------------------------------------------- /example/android/build.gradle: -------------------------------------------------------------------------------- 1 | buildscript { 2 | repositories { 3 | google() 4 | jcenter() 5 | } 6 | 7 | dependencies { 8 | classpath 'com.android.tools.build:gradle:3.0.1' 9 | } 10 | } 11 | 12 | allprojects { 13 | repositories { 14 | google() 15 | jcenter() 16 | } 17 | } 18 | 19 | rootProject.buildDir = '../build' 20 | subprojects { 21 | project.buildDir = "${rootProject.buildDir}/${project.name}" 22 | } 23 | subprojects { 24 | project.evaluationDependsOn(':app') 25 | } 26 | 27 | task clean(type: Delete) { 28 | delete rootProject.buildDir 29 | } 30 | -------------------------------------------------------------------------------- /example/android.iml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | -------------------------------------------------------------------------------- /example/ios/.gitignore: -------------------------------------------------------------------------------- 1 | .idea/ 2 | .vagrant/ 3 | .sconsign.dblite 4 | .svn/ 5 | 6 | .DS_Store 7 | *.swp 8 | profile 9 | 10 | DerivedData/ 11 | build/ 12 | GeneratedPluginRegistrant.h 13 | GeneratedPluginRegistrant.m 14 | 15 | *.pbxuser 16 | *.mode1v3 17 | *.mode2v3 18 | *.perspectivev3 19 | 20 | !default.pbxuser 21 | !default.mode1v3 22 | !default.mode2v3 23 | !default.perspectivev3 24 | 25 | xcuserdata 26 | 27 | *.moved-aside 28 | 29 | *.pyc 30 | *sync/ 31 | Icon? 32 | .tags* 33 | 34 | /Flutter/app.flx 35 | /Flutter/app.zip 36 | /Flutter/flutter_assets/ 37 | /Flutter/App.framework 38 | /Flutter/Flutter.framework 39 | /Flutter/Generated.xcconfig 40 | /ServiceDefinitions.json 41 | 42 | Pods/ 43 | -------------------------------------------------------------------------------- /example/example.iml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | -------------------------------------------------------------------------------- /example/ios/Flutter/AppFrameworkInfo.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | CFBundleDevelopmentRegion 6 | en 7 | CFBundleExecutable 8 | App 9 | CFBundleIdentifier 10 | io.flutter.flutter.app 11 | CFBundleInfoDictionaryVersion 12 | 6.0 13 | CFBundleName 14 | App 15 | CFBundlePackageType 16 | FMWK 17 | CFBundleShortVersionString 18 | 1.0 19 | CFBundleSignature 20 | ???? 21 | CFBundleVersion 22 | 1.0 23 | UIRequiredDeviceCapabilities 24 | 25 | arm64 26 | 27 | MinimumOSVersion 28 | 8.0 29 | 30 | 31 | -------------------------------------------------------------------------------- /example/pubspec.yaml: -------------------------------------------------------------------------------- 1 | name: parallax_image_example 2 | description: A new Flutter project. 3 | 4 | dependencies: 5 | flutter: 6 | sdk: flutter 7 | 8 | # The following adds the Cupertino Icons font to your application. 9 | # Use with the CupertinoIcons class for iOS style icons. 10 | cupertino_icons: ^0.1.0 11 | 12 | dev_dependencies: 13 | flutter_test: 14 | sdk: flutter 15 | parallax_image: 16 | path: ../ 17 | 18 | # For information on the generic Dart part of this file, see the 19 | # following page: https://www.dartlang.org/tools/pub/pubspec 20 | 21 | # The following section is specific to Flutter. 22 | flutter: 23 | 24 | # The following line ensures that the Material Icons font is 25 | # included with your application, so that you can use the icons in 26 | # the material Icons class. 27 | uses-material-design: true 28 | 29 | # To add assets to your application, add an assets section, like this: 30 | assets: 31 | - images/img1.jpg 32 | - images/img2.jpg 33 | - images/img3.jpg 34 | - images/img4.jpg 35 | - images/img5.jpg 36 | - images/img6.jpg 37 | - images/img7.jpg 38 | -------------------------------------------------------------------------------- /parallax_image.iml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | -------------------------------------------------------------------------------- /example/example_android.iml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Copyright (c) 2018, Anatoly Pulyaevskiy. 2 | All rights reserved. 3 | 4 | Redistribution and use in source and binary forms, with or without 5 | modification, are permitted provided that the following conditions are met: 6 | * Redistributions of source code must retain the above copyright 7 | notice, this list of conditions and the following disclaimer. 8 | * Redistributions in binary form must reproduce the above copyright 9 | notice, this list of conditions and the following disclaimer in the 10 | documentation and/or other materials provided with the distribution. 11 | * Neither the name of the nor the 12 | names of its contributors may be used to endorse or promote products 13 | derived from this software without specific prior written permission. 14 | 15 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 16 | ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17 | WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 18 | DISCLAIMED. IN NO EVENT SHALL BE LIABLE FOR ANY 19 | DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 20 | (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 21 | LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 22 | ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 24 | SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 | -------------------------------------------------------------------------------- /example/ios/Runner/Base.lproj/Main.storyboard: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | -------------------------------------------------------------------------------- /example/android/app/build.gradle: -------------------------------------------------------------------------------- 1 | def localProperties = new Properties() 2 | def localPropertiesFile = rootProject.file('local.properties') 3 | if (localPropertiesFile.exists()) { 4 | localPropertiesFile.withReader('UTF-8') { reader -> 5 | localProperties.load(reader) 6 | } 7 | } 8 | 9 | def flutterRoot = localProperties.getProperty('flutter.sdk') 10 | if (flutterRoot == null) { 11 | throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.") 12 | } 13 | 14 | apply plugin: 'com.android.application' 15 | apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle" 16 | 17 | android { 18 | compileSdkVersion 27 19 | 20 | lintOptions { 21 | disable 'InvalidPackage' 22 | } 23 | 24 | defaultConfig { 25 | // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html). 26 | applicationId "com.example.example" 27 | minSdkVersion 16 28 | targetSdkVersion 27 29 | versionCode 1 30 | versionName "1.0" 31 | testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" 32 | } 33 | 34 | buildTypes { 35 | release { 36 | // TODO: Add your own signing config for the release build. 37 | // Signing with the debug keys for now, so `flutter run --release` works. 38 | signingConfig signingConfigs.debug 39 | } 40 | } 41 | } 42 | 43 | flutter { 44 | source '../..' 45 | } 46 | 47 | dependencies { 48 | testImplementation 'junit:junit:4.12' 49 | androidTestImplementation 'com.android.support.test:runner:1.0.1' 50 | androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1' 51 | } 52 | -------------------------------------------------------------------------------- /example/ios/Runner/Info.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | CFBundleDevelopmentRegion 6 | en 7 | CFBundleExecutable 8 | $(EXECUTABLE_NAME) 9 | CFBundleIdentifier 10 | $(PRODUCT_BUNDLE_IDENTIFIER) 11 | CFBundleInfoDictionaryVersion 12 | 6.0 13 | CFBundleName 14 | example 15 | CFBundlePackageType 16 | APPL 17 | CFBundleShortVersionString 18 | 1.0 19 | CFBundleSignature 20 | ???? 21 | CFBundleVersion 22 | 1 23 | LSRequiresIPhoneOS 24 | 25 | UILaunchStoryboardName 26 | LaunchScreen 27 | UIMainStoryboardFile 28 | Main 29 | UIRequiredDeviceCapabilities 30 | 31 | arm64 32 | 33 | UISupportedInterfaceOrientations 34 | 35 | UIInterfaceOrientationPortrait 36 | UIInterfaceOrientationLandscapeLeft 37 | UIInterfaceOrientationLandscapeRight 38 | 39 | UISupportedInterfaceOrientations~ipad 40 | 41 | UIInterfaceOrientationPortrait 42 | UIInterfaceOrientationPortraitUpsideDown 43 | UIInterfaceOrientationLandscapeLeft 44 | UIInterfaceOrientationLandscapeRight 45 | 46 | UIViewControllerBasedStatusBarAppearance 47 | 48 | 49 | 50 | -------------------------------------------------------------------------------- /example/android/app/src/main/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 3 | 4 | 8 | 9 | 10 | 15 | 19 | 26 | 30 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | A Flutter widget that paints an image and moves it at a slower speed than the 2 | main scrolling content. 3 | 4 | ![demo.gif](demo.gif) 5 | 6 | ## Installation 7 | 8 | Add dependency to your `pubspec.yaml`: 9 | 10 | ```yaml 11 | dependencies: 12 | parallax_image: [latest version] 13 | ``` 14 | 15 | ## Usage 16 | 17 | `ParallaxImage` can be used with any `Scrollable` (`ListView` for instance). 18 | When created, it subscribes to scroll updates on nearest `Scrollable` ancestor. 19 | It is also possible to specify custom `ScrollController` in which case this 20 | widget subscribes to updates on `ScrollController.position` (assumes that 21 | controller is attached to only one `Scrollable`). 22 | 23 | ```dart 24 | class MyWidget extends StatefulWidget { 25 | @override 26 | MyWidgetState createState() => new MyWidgetState(); 27 | } 28 | 29 | class MyWidgetState extends State { 30 | final _controller = new ScrollController(); 31 | 32 | @override 33 | Widget build(BuildContext context) { 34 | return new ListView(controller: _controller, children: [ 35 | new ParallaxImage( 36 | image: new AssetImage('images/january.jpg'), 37 | // Extent of this widget in scroll direction. 38 | // In this case it is vertical scroll so extent defines 39 | // the height of this widget. 40 | // The image is scaled with BoxFit.fitWidth which makes it 41 | // occupy full width of this widget. 42 | // After image is scaled it should normally have height greater 43 | // than this value to allow for parallax effect to be 44 | // visible. 45 | extent: 100.0, 46 | // Optionally specify child widget. 47 | child: new Text('January'), 48 | // Optinally specify scroll controller. 49 | controller: _controller, 50 | ), 51 | // ...add more list items 52 | ]); 53 | } 54 | } 55 | ``` 56 | 57 | See `example/` folder for a complete demo. 58 | 59 | ## Features and bugs 60 | 61 | Please file feature requests and bugs at the [issue tracker][issue_tracker]. 62 | 63 | [issue_tracker]: https://github.com/pulyaevskiy/parallax-image/issues 64 | -------------------------------------------------------------------------------- /example/ios/Runner/Base.lproj/LaunchScreen.storyboard: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | -------------------------------------------------------------------------------- /example/android/gradlew.bat: -------------------------------------------------------------------------------- 1 | @if "%DEBUG%" == "" @echo off 2 | @rem ########################################################################## 3 | @rem 4 | @rem Gradle startup script for Windows 5 | @rem 6 | @rem ########################################################################## 7 | 8 | @rem Set local scope for the variables with windows NT shell 9 | if "%OS%"=="Windows_NT" setlocal 10 | 11 | @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 12 | set DEFAULT_JVM_OPTS= 13 | 14 | set DIRNAME=%~dp0 15 | if "%DIRNAME%" == "" set DIRNAME=. 16 | set APP_BASE_NAME=%~n0 17 | set APP_HOME=%DIRNAME% 18 | 19 | @rem Find java.exe 20 | if defined JAVA_HOME goto findJavaFromJavaHome 21 | 22 | set JAVA_EXE=java.exe 23 | %JAVA_EXE% -version >NUL 2>&1 24 | if "%ERRORLEVEL%" == "0" goto init 25 | 26 | echo. 27 | echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 28 | echo. 29 | echo Please set the JAVA_HOME variable in your environment to match the 30 | echo location of your Java installation. 31 | 32 | goto fail 33 | 34 | :findJavaFromJavaHome 35 | set JAVA_HOME=%JAVA_HOME:"=% 36 | set JAVA_EXE=%JAVA_HOME%/bin/java.exe 37 | 38 | if exist "%JAVA_EXE%" goto init 39 | 40 | echo. 41 | echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 42 | echo. 43 | echo Please set the JAVA_HOME variable in your environment to match the 44 | echo location of your Java installation. 45 | 46 | goto fail 47 | 48 | :init 49 | @rem Get command-line arguments, handling Windowz variants 50 | 51 | if not "%OS%" == "Windows_NT" goto win9xME_args 52 | if "%@eval[2+2]" == "4" goto 4NT_args 53 | 54 | :win9xME_args 55 | @rem Slurp the command line arguments. 56 | set CMD_LINE_ARGS= 57 | set _SKIP=2 58 | 59 | :win9xME_args_slurp 60 | if "x%~1" == "x" goto execute 61 | 62 | set CMD_LINE_ARGS=%* 63 | goto execute 64 | 65 | :4NT_args 66 | @rem Get arguments from the 4NT Shell from JP Software 67 | set CMD_LINE_ARGS=%$ 68 | 69 | :execute 70 | @rem Setup the command line 71 | 72 | set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar 73 | 74 | @rem Execute Gradle 75 | "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS% 76 | 77 | :end 78 | @rem End local scope for the variables with windows NT shell 79 | if "%ERRORLEVEL%"=="0" goto mainEnd 80 | 81 | :fail 82 | rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of 83 | rem the _cmd.exe /c_ return code! 84 | if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1 85 | exit /b 1 86 | 87 | :mainEnd 88 | if "%OS%"=="Windows_NT" endlocal 89 | 90 | :omega 91 | -------------------------------------------------------------------------------- /example/lib/main.dart: -------------------------------------------------------------------------------- 1 | import 'package:flutter/material.dart'; 2 | import 'package:parallax_image/parallax_image.dart'; 3 | 4 | void main() => runApp(new MyApp()); 5 | 6 | class MyApp extends StatelessWidget { 7 | @override 8 | Widget build(BuildContext context) { 9 | return new MaterialApp( 10 | title: 'Parallax Image Demo', 11 | theme: new ThemeData(primarySwatch: Colors.blueGrey), 12 | home: new MyHomePage(title: 'Parallax Image Demo'), 13 | ); 14 | } 15 | } 16 | 17 | class MyHomePage extends StatelessWidget { 18 | MyHomePage({Key key, this.title}) : super(key: key); 19 | final String title; 20 | 21 | @override 22 | Widget build(BuildContext context) { 23 | final theme = Theme.of(context); 24 | return new Scaffold( 25 | appBar: new AppBar(title: new Text(title)), 26 | body: new Column( 27 | children: [ 28 | new Container( 29 | padding: const EdgeInsets.all(20.0), 30 | child: new Text( 31 | 'Horizontal scroll parallax', 32 | style: theme.textTheme.title, 33 | ), 34 | ), 35 | new Container( 36 | padding: const EdgeInsets.symmetric(vertical: 10.0), 37 | constraints: const BoxConstraints(maxHeight: 200.0), 38 | child: new ListView.builder( 39 | scrollDirection: Axis.horizontal, 40 | itemBuilder: _buildHorizontalChild, 41 | ), 42 | ), 43 | new Container( 44 | padding: const EdgeInsets.all(20.0), 45 | child: new Text( 46 | 'Vertical scroll parallax', 47 | style: theme.textTheme.title, 48 | ), 49 | ), 50 | new Expanded( 51 | child: new ListView.builder( 52 | itemBuilder: _buildVerticalChild, 53 | ), 54 | ) 55 | ], 56 | ), 57 | ); 58 | } 59 | 60 | Widget _buildVerticalChild(BuildContext context, int index) { 61 | index++; 62 | if (index > 7) return null; 63 | return new Padding( 64 | padding: const EdgeInsets.only(bottom: 10.0), 65 | child: new GestureDetector( 66 | onTap: () { 67 | print('Tapped $index'); 68 | }, 69 | child: new ParallaxImage( 70 | extent: 150.0, 71 | image: new ExactAssetImage( 72 | 'images/img$index.jpg', 73 | ), 74 | ), 75 | ), 76 | ); 77 | } 78 | 79 | Widget _buildHorizontalChild(BuildContext context, int index) { 80 | index++; 81 | if (index > 7) return null; 82 | return new Padding( 83 | padding: const EdgeInsets.only(right: 10.0), 84 | child: new ParallaxImage( 85 | extent: 100.0, 86 | image: new ExactAssetImage( 87 | 'images/img$index.jpg', 88 | ), 89 | ), 90 | ); 91 | } 92 | } 93 | -------------------------------------------------------------------------------- /example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Contents.json: -------------------------------------------------------------------------------- 1 | { 2 | "images" : [ 3 | { 4 | "size" : "20x20", 5 | "idiom" : "iphone", 6 | "filename" : "Icon-App-20x20@2x.png", 7 | "scale" : "2x" 8 | }, 9 | { 10 | "size" : "20x20", 11 | "idiom" : "iphone", 12 | "filename" : "Icon-App-20x20@3x.png", 13 | "scale" : "3x" 14 | }, 15 | { 16 | "size" : "29x29", 17 | "idiom" : "iphone", 18 | "filename" : "Icon-App-29x29@1x.png", 19 | "scale" : "1x" 20 | }, 21 | { 22 | "size" : "29x29", 23 | "idiom" : "iphone", 24 | "filename" : "Icon-App-29x29@2x.png", 25 | "scale" : "2x" 26 | }, 27 | { 28 | "size" : "29x29", 29 | "idiom" : "iphone", 30 | "filename" : "Icon-App-29x29@3x.png", 31 | "scale" : "3x" 32 | }, 33 | { 34 | "size" : "40x40", 35 | "idiom" : "iphone", 36 | "filename" : "Icon-App-40x40@2x.png", 37 | "scale" : "2x" 38 | }, 39 | { 40 | "size" : "40x40", 41 | "idiom" : "iphone", 42 | "filename" : "Icon-App-40x40@3x.png", 43 | "scale" : "3x" 44 | }, 45 | { 46 | "size" : "60x60", 47 | "idiom" : "iphone", 48 | "filename" : "Icon-App-60x60@2x.png", 49 | "scale" : "2x" 50 | }, 51 | { 52 | "size" : "60x60", 53 | "idiom" : "iphone", 54 | "filename" : "Icon-App-60x60@3x.png", 55 | "scale" : "3x" 56 | }, 57 | { 58 | "size" : "20x20", 59 | "idiom" : "ipad", 60 | "filename" : "Icon-App-20x20@1x.png", 61 | "scale" : "1x" 62 | }, 63 | { 64 | "size" : "20x20", 65 | "idiom" : "ipad", 66 | "filename" : "Icon-App-20x20@2x.png", 67 | "scale" : "2x" 68 | }, 69 | { 70 | "size" : "29x29", 71 | "idiom" : "ipad", 72 | "filename" : "Icon-App-29x29@1x.png", 73 | "scale" : "1x" 74 | }, 75 | { 76 | "size" : "29x29", 77 | "idiom" : "ipad", 78 | "filename" : "Icon-App-29x29@2x.png", 79 | "scale" : "2x" 80 | }, 81 | { 82 | "size" : "40x40", 83 | "idiom" : "ipad", 84 | "filename" : "Icon-App-40x40@1x.png", 85 | "scale" : "1x" 86 | }, 87 | { 88 | "size" : "40x40", 89 | "idiom" : "ipad", 90 | "filename" : "Icon-App-40x40@2x.png", 91 | "scale" : "2x" 92 | }, 93 | { 94 | "size" : "76x76", 95 | "idiom" : "ipad", 96 | "filename" : "Icon-App-76x76@1x.png", 97 | "scale" : "1x" 98 | }, 99 | { 100 | "size" : "76x76", 101 | "idiom" : "ipad", 102 | "filename" : "Icon-App-76x76@2x.png", 103 | "scale" : "2x" 104 | }, 105 | { 106 | "size" : "83.5x83.5", 107 | "idiom" : "ipad", 108 | "filename" : "Icon-App-83.5x83.5@2x.png", 109 | "scale" : "2x" 110 | }, 111 | { 112 | "size" : "1024x1024", 113 | "idiom" : "ios-marketing", 114 | "filename" : "Icon-App-1024x1024@1x.png", 115 | "scale" : "1x" 116 | } 117 | ], 118 | "info" : { 119 | "version" : 1, 120 | "author" : "xcode" 121 | } 122 | } 123 | -------------------------------------------------------------------------------- /example/ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme: -------------------------------------------------------------------------------- 1 | 2 | 5 | 8 | 9 | 15 | 21 | 22 | 23 | 24 | 25 | 31 | 32 | 33 | 34 | 40 | 41 | 42 | 43 | 44 | 45 | 56 | 58 | 64 | 65 | 66 | 67 | 68 | 69 | 75 | 77 | 83 | 84 | 85 | 86 | 88 | 89 | 92 | 93 | 94 | -------------------------------------------------------------------------------- /example/android/gradlew: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env bash 2 | 3 | ############################################################################## 4 | ## 5 | ## Gradle start up script for UN*X 6 | ## 7 | ############################################################################## 8 | 9 | # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 10 | DEFAULT_JVM_OPTS="" 11 | 12 | APP_NAME="Gradle" 13 | APP_BASE_NAME=`basename "$0"` 14 | 15 | # Use the maximum available, or set MAX_FD != -1 to use that value. 16 | MAX_FD="maximum" 17 | 18 | warn ( ) { 19 | echo "$*" 20 | } 21 | 22 | die ( ) { 23 | echo 24 | echo "$*" 25 | echo 26 | exit 1 27 | } 28 | 29 | # OS specific support (must be 'true' or 'false'). 30 | cygwin=false 31 | msys=false 32 | darwin=false 33 | case "`uname`" in 34 | CYGWIN* ) 35 | cygwin=true 36 | ;; 37 | Darwin* ) 38 | darwin=true 39 | ;; 40 | MINGW* ) 41 | msys=true 42 | ;; 43 | esac 44 | 45 | # Attempt to set APP_HOME 46 | # Resolve links: $0 may be a link 47 | PRG="$0" 48 | # Need this for relative symlinks. 49 | while [ -h "$PRG" ] ; do 50 | ls=`ls -ld "$PRG"` 51 | link=`expr "$ls" : '.*-> \(.*\)$'` 52 | if expr "$link" : '/.*' > /dev/null; then 53 | PRG="$link" 54 | else 55 | PRG=`dirname "$PRG"`"/$link" 56 | fi 57 | done 58 | SAVED="`pwd`" 59 | cd "`dirname \"$PRG\"`/" >/dev/null 60 | APP_HOME="`pwd -P`" 61 | cd "$SAVED" >/dev/null 62 | 63 | CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar 64 | 65 | # Determine the Java command to use to start the JVM. 66 | if [ -n "$JAVA_HOME" ] ; then 67 | if [ -x "$JAVA_HOME/jre/sh/java" ] ; then 68 | # IBM's JDK on AIX uses strange locations for the executables 69 | JAVACMD="$JAVA_HOME/jre/sh/java" 70 | else 71 | JAVACMD="$JAVA_HOME/bin/java" 72 | fi 73 | if [ ! -x "$JAVACMD" ] ; then 74 | die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME 75 | 76 | Please set the JAVA_HOME variable in your environment to match the 77 | location of your Java installation." 78 | fi 79 | else 80 | JAVACMD="java" 81 | which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 82 | 83 | Please set the JAVA_HOME variable in your environment to match the 84 | location of your Java installation." 85 | fi 86 | 87 | # Increase the maximum file descriptors if we can. 88 | if [ "$cygwin" = "false" -a "$darwin" = "false" ] ; then 89 | MAX_FD_LIMIT=`ulimit -H -n` 90 | if [ $? -eq 0 ] ; then 91 | if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then 92 | MAX_FD="$MAX_FD_LIMIT" 93 | fi 94 | ulimit -n $MAX_FD 95 | if [ $? -ne 0 ] ; then 96 | warn "Could not set maximum file descriptor limit: $MAX_FD" 97 | fi 98 | else 99 | warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT" 100 | fi 101 | fi 102 | 103 | # For Darwin, add options to specify how the application appears in the dock 104 | if $darwin; then 105 | GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\"" 106 | fi 107 | 108 | # For Cygwin, switch paths to Windows format before running java 109 | if $cygwin ; then 110 | APP_HOME=`cygpath --path --mixed "$APP_HOME"` 111 | CLASSPATH=`cygpath --path --mixed "$CLASSPATH"` 112 | JAVACMD=`cygpath --unix "$JAVACMD"` 113 | 114 | # We build the pattern for arguments to be converted via cygpath 115 | ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null` 116 | SEP="" 117 | for dir in $ROOTDIRSRAW ; do 118 | ROOTDIRS="$ROOTDIRS$SEP$dir" 119 | SEP="|" 120 | done 121 | OURCYGPATTERN="(^($ROOTDIRS))" 122 | # Add a user-defined pattern to the cygpath arguments 123 | if [ "$GRADLE_CYGPATTERN" != "" ] ; then 124 | OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)" 125 | fi 126 | # Now convert the arguments - kludge to limit ourselves to /bin/sh 127 | i=0 128 | for arg in "$@" ; do 129 | CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -` 130 | CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option 131 | 132 | if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition 133 | eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"` 134 | else 135 | eval `echo args$i`="\"$arg\"" 136 | fi 137 | i=$((i+1)) 138 | done 139 | case $i in 140 | (0) set -- ;; 141 | (1) set -- "$args0" ;; 142 | (2) set -- "$args0" "$args1" ;; 143 | (3) set -- "$args0" "$args1" "$args2" ;; 144 | (4) set -- "$args0" "$args1" "$args2" "$args3" ;; 145 | (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;; 146 | (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;; 147 | (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;; 148 | (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;; 149 | (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;; 150 | esac 151 | fi 152 | 153 | # Split up the JVM_OPTS And GRADLE_OPTS values into an array, following the shell quoting and substitution rules 154 | function splitJvmOpts() { 155 | JVM_OPTS=("$@") 156 | } 157 | eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS 158 | JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME" 159 | 160 | exec "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" org.gradle.wrapper.GradleWrapperMain "$@" 161 | -------------------------------------------------------------------------------- /lib/parallax_image.dart: -------------------------------------------------------------------------------- 1 | // Copyright (c) 2018, Anatoly Pulyaevskiy. All rights reserved. Use of this source code 2 | // is governed by a BSD-style license that can be found in the LICENSE file. 3 | 4 | /// [ParallaxImage] paints an image and moves it at a slower speed than the main 5 | /// scrolling content. 6 | library parallax_image; 7 | 8 | import 'package:flutter/foundation.dart'; 9 | import 'package:flutter/widgets.dart'; 10 | import 'package:flutter/rendering.dart'; 11 | 12 | /// A widget that paints an image and moves it at a slower speed than the main 13 | /// scrolling content. 14 | /// 15 | /// Image is rendered in a box with specified [extent] in the scroll direction. 16 | /// 17 | /// If scroll [controller] is provided then this widget reacts to scrolling 18 | /// updates in [ScrollController.position] which assumes that controller is 19 | /// attached to only one [Scrollable]. Otherwise this widget looks for 20 | /// nearest [Scrollable] ancestor and subscribes to scrolling updates on it. 21 | /// 22 | /// When scroll direction is [Axis.vertical] the image is scaled to fit width 23 | /// ([BoxFit.fitWidth]) of parent widget. For [Axis.horizontal] scroll direction 24 | /// the image is scaled to fit height ([BoxFit.fitHeight]) of parent widget. 25 | class ParallaxImage extends StatelessWidget { 26 | /// Creates new [ParallaxImage]. 27 | /// 28 | /// [image] and [extent] arguments are required. 29 | /// 30 | /// If scroll [controller] is provided then created widget reacts to scrolling 31 | /// updates in [ScrollController.position] which assumes that controller is 32 | /// attached to only one [Scrollable]. Otherwise created widget looks for 33 | /// nearest [Scrollable] ancestor and subscribes to scrolling updates on it. 34 | ParallaxImage({ 35 | Key key, 36 | @required this.image, 37 | @required this.extent, 38 | this.controller, 39 | this.color, 40 | this.child, 41 | }) : super(key: key); 42 | 43 | /// The image to paint. 44 | final ImageProvider image; 45 | 46 | /// Scroll controller which determines scroll direction and notifies this 47 | /// widget of scroll position changes. 48 | /// 49 | /// If `null` then this widget uses nearest [Scrollable] ancestor to determine 50 | /// scroll direction and listen for scroll position changes. 51 | final ScrollController controller; 52 | 53 | /// Extent of this widget in scroll direction. 54 | /// 55 | /// If scroll direction is [Axis.vertical] it is the height of this widget, 56 | /// if scroll direction is [Axis.horizontal] it is the width. 57 | final double extent; 58 | 59 | /// Optional color to paint behind the [image]. 60 | final Color color; 61 | 62 | /// The optional child of this widget. 63 | final Widget child; 64 | 65 | @override 66 | Widget build(BuildContext context) { 67 | final media = MediaQuery.of(context); 68 | final scrollPosition = (controller != null) 69 | ? controller.position 70 | : Scrollable.of(context).position; 71 | final constraints = (scrollPosition.axis == Axis.vertical) 72 | ? new BoxConstraints(minHeight: extent) 73 | : new BoxConstraints(minWidth: extent); 74 | return new RepaintBoundary( 75 | child: new ConstrainedBox( 76 | constraints: constraints, 77 | child: new _Parallax( 78 | image: image, 79 | scrollPosition: scrollPosition, 80 | child: child, 81 | screenSize: media.size, 82 | ), 83 | ), 84 | ); 85 | } 86 | 87 | @override 88 | void debugFillProperties(DiagnosticPropertiesBuilder description) { 89 | super.debugFillProperties(description); 90 | 91 | description.add(new DoubleProperty('extent', extent)); 92 | description.add(new DiagnosticsProperty('image', image)); 93 | description.add(new DiagnosticsProperty('color', color)); 94 | } 95 | } 96 | 97 | class _Parallax extends SingleChildRenderObjectWidget { 98 | _Parallax({ 99 | Key key, 100 | @required this.image, 101 | @required this.scrollPosition, 102 | @required this.screenSize, 103 | this.color, 104 | Widget child, 105 | }) : super(key: key, child: child); 106 | final ImageProvider image; 107 | final ScrollPosition scrollPosition; 108 | final Size screenSize; 109 | final Color color; 110 | 111 | @override 112 | _RenderParallax createRenderObject(BuildContext context) { 113 | return new _RenderParallax( 114 | scrollPosition: scrollPosition, 115 | image: image, 116 | screenSize: screenSize, 117 | color: color, 118 | ); 119 | } 120 | 121 | @override 122 | void updateRenderObject(BuildContext context, _RenderParallax renderObject) { 123 | renderObject 124 | ..image = image 125 | ..scrollPosition = scrollPosition 126 | ..screenSize = screenSize 127 | ..color = color; 128 | } 129 | } 130 | 131 | class _RenderParallax extends RenderProxyBox { 132 | _RenderParallax({ 133 | @required ScrollPosition scrollPosition, 134 | @required ImageProvider image, 135 | @required Size screenSize, 136 | Color color, 137 | ImageConfiguration configuration: ImageConfiguration.empty, 138 | RenderBox child, 139 | }) : _image = image, 140 | _scrollPosition = scrollPosition, 141 | _screenSize = screenSize, 142 | _color = color, 143 | _configuration = configuration, 144 | super(child); 145 | 146 | ImageProvider _image; 147 | ScrollPosition _scrollPosition; 148 | Size _screenSize; 149 | Color _color; 150 | ImageConfiguration _configuration; 151 | Offset _position; 152 | BoxPainter _painter; 153 | 154 | set image(ImageProvider value) { 155 | if (value == _image) return; 156 | _image = value; 157 | _painter?.dispose(); 158 | _painter = null; 159 | _decoration = null; 160 | markNeedsPaint(); 161 | } 162 | 163 | set scrollPosition(ScrollPosition value) { 164 | if (value == _scrollPosition) return; 165 | if (attached) _scrollPosition.removeListener(markNeedsPaint); 166 | _scrollPosition = value; 167 | if (attached) _scrollPosition.addListener(markNeedsPaint); 168 | markNeedsPaint(); 169 | } 170 | 171 | set screenSize(Size value) { 172 | if (value == _screenSize) return; 173 | _screenSize = value; 174 | markNeedsPaint(); 175 | } 176 | 177 | set color(Color value) { 178 | if (value == _color) return; 179 | _color = value; 180 | _painter?.dispose(); 181 | _painter = null; 182 | _decoration = null; 183 | markNeedsPaint(); 184 | } 185 | 186 | ImageConfiguration get configuration => _configuration; 187 | 188 | Decoration get decoration { 189 | if (_decoration != null) return _decoration; 190 | 191 | /// Algorithm here uses only devices screen size and current 192 | /// global position of this image. 193 | /// 194 | /// We calculate absolute position of this image as a fraction of screen size 195 | /// in range `0.0...1.0`, where `0.0` means the image is at the top of the 196 | /// screen and `1.0` means it's at the bottom. 197 | /// 198 | /// When image is centered on the screen (position `0.5`) it should also 199 | /// have centered alignment ([Alignment.center]) within it's render box. 200 | /// 201 | /// When image moves in any direction from the screen center we adjust 202 | /// its alignment by the distance traveled as a fraction of screen 203 | /// size. 204 | /// 205 | /// So alignment of image at the screen center would be equal to `0.0` 206 | /// in the scroll direction. For an image with screen position `0.0` its 207 | /// alignment would be `-0.5` because it traveled half of the screen size. 208 | 209 | // TODO: Might be a good idea to provide a way to customize this logic. 210 | Alignment alignment; 211 | if (_scrollPosition.axis == Axis.vertical) { 212 | double value = (_position.dy / _screenSize.height - 0.5).clamp(-1.0, 1.0); 213 | alignment = new Alignment(0.0, value); 214 | } else { 215 | double value = (_position.dx / _screenSize.width - 0.5).clamp(-1.0, 1.0); 216 | alignment = new Alignment(value, 0.0); 217 | } 218 | 219 | _decoration = new BoxDecoration( 220 | color: _color, 221 | image: new DecorationImage( 222 | alignment: alignment, 223 | image: _image, 224 | fit: fit, 225 | ), 226 | ); 227 | return _decoration; 228 | } 229 | 230 | Decoration _decoration; 231 | 232 | BoxFit get fit { 233 | return (_scrollPosition.axis == Axis.vertical) 234 | ? BoxFit.fitWidth 235 | : BoxFit.fitHeight; 236 | } 237 | 238 | @override 239 | void attach(PipelineOwner owner) { 240 | super.attach(owner); 241 | _scrollPosition.addListener(markNeedsPaint); 242 | } 243 | 244 | @override 245 | void detach() { 246 | _painter?.dispose(); 247 | _painter = null; 248 | _scrollPosition.removeListener(markNeedsPaint); 249 | super.detach(); 250 | markNeedsPaint(); 251 | } 252 | 253 | @protected 254 | bool hitTestSelf(Offset position) => true; 255 | 256 | @override 257 | void paint(PaintingContext context, Offset offset) { 258 | assert(size.width != null); 259 | assert(size.height != null); 260 | // We use center of the widget's render box as a reference point. 261 | var pos = localToGlobal(new Offset(size.width / 2, size.height / 2)); 262 | if (_position != pos) { 263 | _painter?.dispose(); 264 | _painter = null; 265 | _decoration = null; 266 | _position = pos; 267 | } 268 | _painter ??= decoration.createBoxPainter(markNeedsPaint); 269 | final ImageConfiguration filledConfiguration = 270 | configuration.copyWith(size: size); 271 | int debugSaveCount; 272 | assert(() { 273 | debugSaveCount = context.canvas.getSaveCount(); 274 | return true; 275 | }()); 276 | _painter.paint(context.canvas, offset, filledConfiguration); 277 | assert(() { 278 | if (debugSaveCount != context.canvas.getSaveCount()) { 279 | throw new FlutterError( 280 | '${decoration.runtimeType} painter had mismatching save and restore calls.\n' 281 | 'Before painting the decoration, the canvas save count was $debugSaveCount. ' 282 | 'After painting it, the canvas save count was ${context.canvas.getSaveCount()}. ' 283 | 'Every call to save() or saveLayer() must be matched by a call to restore().\n' 284 | 'The decoration was:\n' 285 | ' $decoration\n' 286 | 'The painter was:\n' 287 | ' $_painter'); 288 | } 289 | return true; 290 | }()); 291 | if (decoration.isComplex) context.setIsComplexHint(); 292 | super.paint(context, offset); 293 | } 294 | 295 | @override 296 | void debugFillProperties(DiagnosticPropertiesBuilder description) { 297 | super.debugFillProperties(description); 298 | 299 | description.add(new DiagnosticsProperty( 300 | 'scrollPosition', _scrollPosition)); 301 | description.add(new DiagnosticsProperty('screenSize', _screenSize)); 302 | description.add(_decoration.toDiagnosticsNode(name: 'decoration')); 303 | description.add(new DiagnosticsProperty( 304 | 'configuration', configuration)); 305 | } 306 | } 307 | -------------------------------------------------------------------------------- /example/ios/Runner.xcodeproj/project.pbxproj: -------------------------------------------------------------------------------- 1 | // !$*UTF8*$! 2 | { 3 | archiveVersion = 1; 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