├── .github └── FUNDING.yml ├── .gitignore ├── CHANGELOG.md ├── LICENSE ├── README.md ├── doc └── images │ └── parallax.gif ├── example ├── .gitignore ├── .metadata ├── README.md ├── android │ ├── .gitignore │ ├── app │ │ ├── build.gradle │ │ └── src │ │ │ └── main │ │ │ ├── AndroidManifest.xml │ │ │ ├── java │ │ │ └── com │ │ │ │ └── letsar │ │ │ │ └── example │ │ │ │ └── MainActivity.java │ │ │ └── res │ │ │ ├── drawable │ │ │ └── launch_background.xml │ │ │ ├── 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 │ ├── build.gradle │ ├── gradle.properties │ ├── gradle │ │ └── wrapper │ │ │ ├── gradle-wrapper.jar │ │ │ └── gradle-wrapper.properties │ ├── gradlew │ ├── gradlew.bat │ └── settings.gradle ├── ios │ ├── .gitignore │ ├── Flutter │ │ ├── AppFrameworkInfo.plist │ │ ├── Debug.xcconfig │ │ └── Release.xcconfig │ ├── Runner.xcodeproj │ │ ├── project.pbxproj │ │ ├── project.xcworkspace │ │ │ └── contents.xcworkspacedata │ │ └── xcshareddata │ │ │ └── xcschemes │ │ │ └── Runner.xcscheme │ ├── Runner.xcworkspace │ │ └── contents.xcworkspacedata │ └── Runner │ │ ├── AppDelegate.h │ │ ├── AppDelegate.m │ │ ├── Assets.xcassets │ │ ├── AppIcon.appiconset │ │ │ ├── Contents.json │ │ │ ├── Icon-App-1024x1024@1x.png │ │ │ ├── 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-83.5x83.5@2x.png │ │ └── LaunchImage.imageset │ │ │ ├── Contents.json │ │ │ ├── LaunchImage.png │ │ │ ├── LaunchImage@2x.png │ │ │ ├── LaunchImage@3x.png │ │ │ └── README.md │ │ ├── Base.lproj │ │ ├── LaunchScreen.storyboard │ │ └── Main.storyboard │ │ ├── Info.plist │ │ └── main.m ├── lib │ └── main.dart └── pubspec.yaml ├── lib ├── flutter_parallax.dart └── src │ ├── rendering │ └── parallax.dart │ └── widgets │ └── parallax.dart ├── pubspec.yaml └── test └── flutter_parallax_test.dart /.github/FUNDING.yml: -------------------------------------------------------------------------------- 1 | github: letsar 2 | patreon: romainrastel 3 | open_collective: # Replace with a single Open Collective username 4 | ko_fi: # Replace with a single Ko-fi username 5 | tidelift: # Replace with a single Tidelift platform-name/package-name e.g., npm/babel 6 | community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry 7 | liberapay: # Replace with a single Liberapay username 8 | issuehunt: # Replace with a single IssueHunt username 9 | otechie: # Replace with a single Otechie username 10 | custom: ['https://www.buymeacoffee.com/romainrastel', 'paypal.me/RomainRastel'] 11 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | # See https://www.dartlang.org/tools/private-files.html 2 | 3 | # Files and directories created by pub 4 | .dart_tool/ 5 | .packages 6 | .pub/ 7 | build/ 8 | # If you're building an application, you may want to check-in your pubspec.lock 9 | pubspec.lock 10 | 11 | # Directory created by dartdoc 12 | # If you don't generate documentation locally you can remove this line. 13 | doc/api/ 14 | 15 | *.iml 16 | *.ipr 17 | *.iws 18 | .idea/ 19 | .DS_Store -------------------------------------------------------------------------------- /CHANGELOG.md: -------------------------------------------------------------------------------- 1 | ## 0.1.2 2 | * Add Dart 2 support. 3 | 4 | ## 0.1.1 5 | * Remove Flutter SDK constraint 6 | 7 | ## 0.1.0 8 | * Initial Open Source release 9 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) 2018 Romain Rastel 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # flutter_parallax 2 | 3 | A Flutter widget that moves according to a scroll controller. 4 | 5 | [![Pub](https://img.shields.io/pub/v/flutter_parallax.svg)](https://pub.dartlang.org/packages/flutter_parallax) 6 | 7 | ## Features 8 | 9 | * Can contain **any** widget. 10 | * Configurable parallax scroll direction. 11 | * Customizable parallax delegate. 12 | * For widgets inside **and** outside a scroll view (list items and list backgrounds for example). 13 | 14 | ![Screenshot](https://raw.githubusercontent.com/letsar/flutter_parallax/master/doc/images/parallax.gif) 15 | 16 | ## Getting started 17 | 18 | In the `pubspec.yaml` of your flutter project, add the following dependency: 19 | 20 | ```yaml 21 | dependencies: 22 | ... 23 | flutter_parallax: "^0.1.2" 24 | ``` 25 | 26 | In your library add the following import: 27 | 28 | ```dart 29 | import 'package:flutter_parallax/flutter_parallax.dart'; 30 | ``` 31 | 32 | For help getting started with Flutter, view the online [documentation](https://flutter.io/). 33 | 34 | ## Example 35 | 36 | ```dart 37 | new Parallax.inside( 38 | child: new Image.network('https://flutter.io/images/homepage/header-illustration.png'), 39 | mainAxisExtent: 150.0, 40 | ); 41 | ``` 42 | 43 | You can find more examples in the [Example](https://github.com/letsar/flutter_parallax/tree/master/example) project. 44 | 45 | ## Constructors 46 | 47 | * The `Parallax.inside`, that computes the parallax offset from its position in its first `Scrollable` parent. 48 | Useful for list or grid items. 49 | * The `Parallax.outside`, that computes the parallax offset from the percentage of the scrollable's container extent. 50 | Useful for a list or grid background. 51 | * The `Parallax.custom` takes a `ParallaxDelegate`, which provides the ability to customize additional aspects of the child model. For example, a `ParallaxDelegate` 52 | can control the algorithm used to computes the parallax offset of the child within its parent. 53 | 54 | ## Changelog 55 | 56 | Please see the [Changelog](https://github.com/letsar/flutter_parallax/blob/master/CHANGELOG.md) page to know what's recently changed. 57 | 58 | ## Contributions 59 | 60 | Feel free to contribute to this project. 61 | 62 | If you find a bug or want a feature, but don't know how to fix/implement it, please fill an [issue](https://github.com/letsar/flutter_parallax/issues). 63 | If you fixed a bug or implemented a new feature, please send a [pull request](https://github.com/letsar/flutter_parallax/pulls). -------------------------------------------------------------------------------- /doc/images/parallax.gif: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/letsar/flutter_parallax/d700eb3db1f165c14f4b7f3b8b06fbce25c0f923/doc/images/parallax.gif -------------------------------------------------------------------------------- /example/.gitignore: -------------------------------------------------------------------------------- 1 | .DS_Store 2 | .atom/ 3 | .idea 4 | .vscode/ 5 | .packages 6 | .pub/ 7 | build/ 8 | ios/.generated/ 9 | packages 10 | .flutter-plugins 11 | -------------------------------------------------------------------------------- /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: 3ea4d06340a97a1e9d7cae97567c64e0569dcaa2 8 | channel: beta 9 | -------------------------------------------------------------------------------- /example/README.md: -------------------------------------------------------------------------------- 1 | # example 2 | 3 | A new Flutter project. 4 | 5 | ## Getting Started 6 | 7 | For help getting started with Flutter, view our online 8 | [documentation](https://flutter.io/). 9 | -------------------------------------------------------------------------------- /example/android/.gitignore: -------------------------------------------------------------------------------- 1 | *.iml 2 | *.class 3 | .gradle 4 | /local.properties 5 | /.idea/workspace.xml 6 | /.idea/libraries 7 | .DS_Store 8 | /build 9 | /captures 10 | GeneratedPluginRegistrant.java 11 | -------------------------------------------------------------------------------- /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.letsar.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/android/app/src/main/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 3 | 4 | 8 | 9 | 10 | 15 | 19 | 26 | 30 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | -------------------------------------------------------------------------------- /example/android/app/src/main/java/com/letsar/example/MainActivity.java: -------------------------------------------------------------------------------- 1 | package com.letsar.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/android/app/src/main/res/drawable/launch_background.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 12 | 13 | -------------------------------------------------------------------------------- /example/android/app/src/main/res/mipmap-hdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/letsar/flutter_parallax/d700eb3db1f165c14f4b7f3b8b06fbce25c0f923/example/android/app/src/main/res/mipmap-hdpi/ic_launcher.png -------------------------------------------------------------------------------- /example/android/app/src/main/res/mipmap-mdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/letsar/flutter_parallax/d700eb3db1f165c14f4b7f3b8b06fbce25c0f923/example/android/app/src/main/res/mipmap-mdpi/ic_launcher.png -------------------------------------------------------------------------------- /example/android/app/src/main/res/mipmap-xhdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/letsar/flutter_parallax/d700eb3db1f165c14f4b7f3b8b06fbce25c0f923/example/android/app/src/main/res/mipmap-xhdpi/ic_launcher.png -------------------------------------------------------------------------------- /example/android/app/src/main/res/mipmap-xxhdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/letsar/flutter_parallax/d700eb3db1f165c14f4b7f3b8b06fbce25c0f923/example/android/app/src/main/res/mipmap-xxhdpi/ic_launcher.png -------------------------------------------------------------------------------- /example/android/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/letsar/flutter_parallax/d700eb3db1f165c14f4b7f3b8b06fbce25c0f923/example/android/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png -------------------------------------------------------------------------------- /example/android/app/src/main/res/values/styles.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 8 | 9 | -------------------------------------------------------------------------------- /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/gradle.properties: -------------------------------------------------------------------------------- 1 | org.gradle.jvmargs=-Xmx1536M 2 | -------------------------------------------------------------------------------- /example/android/gradle/wrapper/gradle-wrapper.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/letsar/flutter_parallax/d700eb3db1f165c14f4b7f3b8b06fbce25c0f923/example/android/gradle/wrapper/gradle-wrapper.jar -------------------------------------------------------------------------------- /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/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 | -------------------------------------------------------------------------------- /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/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/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/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/ios/Flutter/Debug.xcconfig: -------------------------------------------------------------------------------- 1 | #include "Generated.xcconfig" 2 | -------------------------------------------------------------------------------- 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"$(PROJECT_DIR)/Flutter", 406 | ); 407 | PRODUCT_BUNDLE_IDENTIFIER = com.letsar.example; 408 | PRODUCT_NAME = "$(TARGET_NAME)"; 409 | }; 410 | name = Release; 411 | }; 412 | /* End XCBuildConfiguration section */ 413 | 414 | /* Begin XCConfigurationList section */ 415 | 97C146E91CF9000F007C117D /* Build configuration list for PBXProject "Runner" */ = { 416 | isa = XCConfigurationList; 417 | buildConfigurations = ( 418 | 97C147031CF9000F007C117D /* Debug */, 419 | 97C147041CF9000F007C117D /* Release */, 420 | ); 421 | defaultConfigurationIsVisible = 0; 422 | defaultConfigurationName = Release; 423 | }; 424 | 97C147051CF9000F007C117D /* Build configuration list for PBXNativeTarget "Runner" */ = { 425 | isa = XCConfigurationList; 426 | buildConfigurations = ( 427 | 97C147061CF9000F007C117D /* Debug */, 428 | 97C147071CF9000F007C117D /* Release */, 429 | ); 430 | defaultConfigurationIsVisible = 0; 431 | defaultConfigurationName = Release; 432 | }; 433 | /* End XCConfigurationList section */ 434 | }; 435 | rootObject = 97C146E61CF9000F007C117D /* Project object */; 436 | } 437 | -------------------------------------------------------------------------------- /example/ios/Runner.xcodeproj/project.xcworkspace/contents.xcworkspacedata: -------------------------------------------------------------------------------- 1 | 2 | 4 | 6 | 7 | 8 | -------------------------------------------------------------------------------- /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/ios/Runner.xcworkspace/contents.xcworkspacedata: -------------------------------------------------------------------------------- 1 | 2 | 4 | 6 | 7 | 8 | -------------------------------------------------------------------------------- /example/ios/Runner/AppDelegate.h: -------------------------------------------------------------------------------- 1 | #import 2 | #import 3 | 4 | @interface AppDelegate : FlutterAppDelegate 5 | 6 | @end 7 | -------------------------------------------------------------------------------- /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 | -------------------------------------------------------------------------------- /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/Assets.xcassets/AppIcon.appiconset/Icon-App-1024x1024@1x.png: -------------------------------------------------------------------------------- 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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/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/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/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/lib/main.dart: -------------------------------------------------------------------------------- 1 | import 'package:flutter/material.dart'; 2 | import 'package:flutter_parallax/flutter_parallax.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: 'Flutter Demo', 11 | theme: new ThemeData( 12 | primarySwatch: Colors.blue, 13 | ), 14 | home: new MyHomePage(title: 'Parallax demo'), 15 | ); 16 | } 17 | } 18 | 19 | class MyHomePage extends StatefulWidget { 20 | MyHomePage({Key key, this.title}) : super(key: key); 21 | 22 | final String title; 23 | 24 | @override 25 | _MyHomePageState createState() => new _MyHomePageState(); 26 | } 27 | 28 | class _MyHomePageState extends State { 29 | ScrollController _scrollController; 30 | 31 | @override 32 | void initState() { 33 | super.initState(); 34 | _scrollController = new ScrollController(); 35 | } 36 | 37 | @override 38 | Widget build(BuildContext context) { 39 | return new Scaffold( 40 | appBar: new AppBar(title: new Text(widget.title)), 41 | body: new Stack( 42 | children: [ 43 | new Parallax.outside( 44 | controller: _scrollController, 45 | child: new Column( 46 | children: [ 47 | new Container( 48 | color: Colors.red, 49 | height: 200.0, 50 | ), 51 | new Container( 52 | color: Colors.pink, 53 | height: 200.0, 54 | ), 55 | new Container( 56 | color: Colors.lightGreen, 57 | height: 200.0, 58 | ), 59 | new Container( 60 | color: Colors.orange, 61 | height: 200.0, 62 | ), 63 | new Container( 64 | color: Colors.teal, 65 | height: 200.0, 66 | ), 67 | new Container( 68 | color: Colors.purple, 69 | height: 200.0, 70 | ), 71 | new Container( 72 | color: Colors.grey, 73 | height: 200.0, 74 | ), 75 | new Container( 76 | color: Colors.lime, 77 | height: 200.0, 78 | ), 79 | new Container( 80 | color: Colors.indigo, 81 | height: 200.0, 82 | ), 83 | new Container( 84 | color: Colors.yellow, 85 | height: 200.0, 86 | ), 87 | new Container( 88 | color: Colors.green, 89 | height: 200.0, 90 | ), 91 | new Container( 92 | color: Colors.blue, 93 | height: 200.0, 94 | ), 95 | ], 96 | ), 97 | ), 98 | new ListView.builder( 99 | controller: _scrollController, 100 | itemBuilder: buildItem, 101 | itemCount: 20, 102 | ), 103 | ], 104 | ), 105 | ); 106 | } 107 | 108 | Widget buildItem(BuildContext context, int index) { 109 | var mode = index % 4; 110 | switch (mode) { 111 | case 0: 112 | return new Parallax.inside( 113 | child: new Image.network( 114 | 'https://flutter.io/images/homepage/header-illustration.png'), 115 | mainAxisExtent: 150.0, 116 | ); 117 | case 1: 118 | return new Parallax.inside( 119 | child: new Image.network( 120 | 'http://t.wallpaperweb.org/wallpaper/nature/3840x1024/9XMedia1280TripleHorizontalMountainsclouds.jpg'), 121 | mainAxisExtent: 150.0, 122 | direction: AxisDirection.right, 123 | ); 124 | case 2: 125 | return new Parallax.inside( 126 | child: new Image.network( 127 | 'https://flutter.io/images/homepage/header-illustration.png'), 128 | mainAxisExtent: 150.0, 129 | flipDirection: true, 130 | ); 131 | default: 132 | return new Parallax.inside( 133 | child: new Image.network( 134 | 'http://t.wallpaperweb.org/wallpaper/nature/3840x1024/9XMedia1280TripleHorizontalMountainsclouds.jpg'), 135 | mainAxisExtent: 150.0, 136 | direction: AxisDirection.left, 137 | ); 138 | } 139 | } 140 | } 141 | -------------------------------------------------------------------------------- /example/pubspec.yaml: -------------------------------------------------------------------------------- 1 | name: 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 | flutter_parallax: 13 | path: ../ 14 | 15 | dev_dependencies: 16 | flutter_test: 17 | sdk: flutter 18 | 19 | # For information on the generic Dart part of this file, see the 20 | # following page: https://www.dartlang.org/tools/pub/pubspec 21 | 22 | # The following section is specific to Flutter. 23 | flutter: 24 | 25 | # The following line ensures that the Material Icons font is 26 | # included with your application, so that you can use the icons in 27 | # the material Icons class. 28 | uses-material-design: true 29 | -------------------------------------------------------------------------------- /lib/flutter_parallax.dart: -------------------------------------------------------------------------------- 1 | library flutter_parallax; 2 | 3 | export 'src/rendering/parallax.dart'; 4 | export 'src/widgets/parallax.dart'; 5 | -------------------------------------------------------------------------------- /lib/src/rendering/parallax.dart: -------------------------------------------------------------------------------- 1 | import 'dart:math' as math; 2 | import 'dart:ui' show lerpDouble; 3 | 4 | import 'package:flutter/foundation.dart'; 5 | import 'package:flutter/widgets.dart'; 6 | import 'package:flutter/rendering.dart'; 7 | 8 | /// A delegate that controls the parallax effect of a [Parallax] widget. 9 | /// 10 | /// Used by [ParallaxSingleChildLayout] (in the widgets folder) and 11 | /// [RenderParallaxSingleChildLayoutBox] (in this file). 12 | /// 13 | /// When asked to layout, [RenderParallaxSingleChildLayoutBox] first calls [getSize] with 14 | /// its incoming constraints to determine its size. It then calls 15 | /// [getConstraintsForChild] to determine the constraints to apply to the child. 16 | /// After the child completes its layout, [RenderParallaxSingleChildLayoutBox] 17 | /// calls [getPositionForChild] to determine the child's position. 18 | /// 19 | /// The [shouldRelayout] method is called when a new instance of the class 20 | /// is provided, to check if the new instance actually represents different 21 | /// information. 22 | /// 23 | /// See also: 24 | /// 25 | /// * [ParallaxSingleChildLayout], the widget that uses this delegate. 26 | /// * [RenderParallaxSingleChildLayoutBox], render object that uses this 27 | /// delegate. 28 | abstract class ParallaxDelegate { 29 | /// Creates a parallax layout delegate. 30 | /// 31 | /// The layout will update whenever [controller] notifies its listeners. 32 | const ParallaxDelegate({ 33 | @required this.controller, 34 | }) : assert(controller != null); 35 | 36 | /// The controller used to update the parallax offset. 37 | final ScrollController controller; 38 | 39 | /// The size of this object given the incoming constraints. 40 | /// 41 | /// Defaults to the biggest size that satisfies the given constraints. 42 | Size getSize(BoxConstraints constraints) => constraints.biggest; 43 | 44 | /// The constraints for the child given the incoming constraints. 45 | /// 46 | /// During layout, the child is given the layout constraints returned by this 47 | /// function. The child is required to pick a size for itself that satisfies 48 | /// these constraints. 49 | /// 50 | /// Defaults to the given constraints. 51 | BoxConstraints getConstraintsForChild(BoxConstraints constraints) => 52 | constraints; 53 | 54 | /// The position where the child should be placed. 55 | /// 56 | /// The `size` argument is the size of the parent, which might be different 57 | /// from the value returned by [getSize] if that size doesn't satisfy the 58 | /// constraints passed to [getSize]. The `childSize` argument is the size of 59 | /// the child, which will satisfy the constraints returned by 60 | /// [getConstraintsForChild]. 61 | /// 62 | /// Defaults to positioning the child in the upper left corner of the parent. 63 | Offset getPositionForChild(Size size, Size childSize, RenderBox renderBox) => 64 | Offset.zero; 65 | 66 | /// Called whenever a new instance of the custom layout delegate class is 67 | /// provided to the [RenderParallaxSingleChildLayoutBox] object, or any time 68 | /// that a new [ParallaxSingleChildLayout] object is created with a new instance 69 | /// of the custom layout delegate class (which amounts to the same thing, 70 | /// because the latter is implemented in terms of the former). 71 | /// 72 | /// If the new instance represents different information than the old 73 | /// instance, then the method should return true, otherwise it should return 74 | /// false. 75 | /// 76 | /// If the method returns false, then the [getSize], 77 | /// [getConstraintsForChild], and [getPositionForChild] calls might be 78 | /// optimized away. 79 | /// 80 | /// It's possible that the layout methods will get called even if 81 | /// [shouldRelayout] returns false (e.g. if an ancestor changed its layout). 82 | /// It's also possible that the layout method will get called 83 | /// without [shouldRelayout] being called at all (e.g. if the parent changes 84 | /// size). 85 | bool shouldRelayout(covariant ParallaxDelegate oldDelegate) { 86 | return controller != oldDelegate.controller; 87 | } 88 | } 89 | 90 | /// A parallax layout delegate that follows a given direction when scrolled. 91 | /// 92 | /// See also: 93 | /// 94 | /// * [ParallaxInsideDelegate], which is a delegate for widgets inside a scroll view. 95 | /// * [ParallaxOutsideDelegate], which is a delegate for widgets outside a scroll view. 96 | abstract class ParallaxWithAxisDirectionDelegate extends ParallaxDelegate { 97 | /// Creates a parallax layout delegate that indicates its own scroll direction 98 | /// independently of the [controller.position] one. 99 | /// 100 | /// The [controller] and [flipDirection] arguments must not be null. 101 | const ParallaxWithAxisDirectionDelegate({ 102 | @required ScrollController controller, 103 | this.direction, 104 | this.flipDirection = false, 105 | }) : assert(controller != null), 106 | assert(flipDirection != null), 107 | super(controller: controller); 108 | 109 | /// The direction of the parallax effect when scroll offset increases. 110 | /// 111 | /// When null, the direction is the same as the [controller]. 112 | final AxisDirection direction; 113 | 114 | /// Whether to flip the given [direction]. 115 | /// 116 | /// Defaults to false. 117 | final bool flipDirection; 118 | 119 | static Offset _getOffsetUnit(AxisDirection direction) { 120 | switch (direction) { 121 | case AxisDirection.up: 122 | case AxisDirection.down: 123 | return const Offset(0.0, 1.0); 124 | case AxisDirection.left: 125 | case AxisDirection.right: 126 | return const Offset(1.0, 0.0); 127 | } 128 | return null; 129 | } 130 | 131 | @override 132 | bool shouldRelayout(ParallaxWithAxisDirectionDelegate oldDelegate) { 133 | return super.shouldRelayout(oldDelegate) || 134 | direction != oldDelegate.direction; 135 | } 136 | 137 | @override 138 | Offset getPositionForChild(Size size, Size childSize, RenderBox renderBox) { 139 | final ScrollPosition position = controller.position; 140 | assert(position != null); 141 | 142 | final AxisDirection parallaxDirection = _getParallaxDirection(); 143 | final Axis parallaxAxis = axisDirectionToAxis(parallaxDirection); 144 | 145 | final Offset offsetUnit = _getOffsetUnit(parallaxDirection); 146 | 147 | final double childExtent = 148 | (parallaxAxis == Axis.horizontal) ? childSize.width : childSize.height; 149 | final double mainAxisExtent = 150 | (parallaxAxis == Axis.horizontal) ? size.width : size.height; 151 | 152 | if (mainAxisExtent < childExtent) { 153 | double scrollRatio = 154 | getChildScrollRatio(offsetUnit, childExtent, renderBox); 155 | if (parallaxDirection == AxisDirection.down || 156 | parallaxDirection == AxisDirection.right) { 157 | scrollRatio = 1.0 - scrollRatio; 158 | } 159 | 160 | final offset = 161 | childExtent - lerpDouble(mainAxisExtent, childExtent, scrollRatio); 162 | 163 | return -(offsetUnit * offset); 164 | } else { 165 | return Offset.zero; 166 | } 167 | } 168 | 169 | double getChildScrollRatio( 170 | Offset offsetUnit, double childExtent, RenderBox renderBox); 171 | 172 | AxisDirection _getParallaxDirection() { 173 | AxisDirection parallaxDirection = 174 | direction ?? controller?.position?.axisDirection; 175 | if (flipDirection) { 176 | parallaxDirection = flipAxisDirection(parallaxDirection); 177 | } 178 | assert(parallaxDirection != null); 179 | return parallaxDirection; 180 | } 181 | } 182 | 183 | /// A parallax delegate for a widget inside a scroll view. 184 | /// 185 | /// The parallax offset is determined by the position of the widget within its first [Scrollable] 186 | /// parent. 187 | class ParallaxInsideDelegate extends ParallaxWithAxisDirectionDelegate { 188 | /// Creates a parallax layout delegate for widgets inside a scroll view. 189 | /// 190 | /// The [controller], [mainAxisExtent] and [flipDirection] arguments must not be null. 191 | /// The [mainAxisExtent] argument must be positive. 192 | const ParallaxInsideDelegate({ 193 | @required ScrollController controller, 194 | @required this.mainAxisExtent, 195 | AxisDirection direction, 196 | bool flipDirection = false, 197 | }) : assert(mainAxisExtent != null && mainAxisExtent >= 0.0), 198 | super( 199 | controller: controller, 200 | direction: direction, 201 | flipDirection: flipDirection, 202 | ); 203 | 204 | /// The extent of the layout in the same axis as the scrolling. 205 | final double mainAxisExtent; 206 | 207 | @override 208 | BoxConstraints getConstraintsForChild(BoxConstraints constraints) { 209 | final AxisDirection parallaxDirection = _getParallaxDirection(); 210 | final Axis parallaxAxis = axisDirectionToAxis(parallaxDirection); 211 | final Axis scrollAxis = controller?.position?.axis; 212 | 213 | if (scrollAxis == parallaxAxis) { 214 | return scrollAxis == Axis.horizontal 215 | ? constraints.heightConstraints() 216 | : constraints.widthConstraints(); 217 | } else { 218 | return scrollAxis == Axis.horizontal 219 | ? constraints.widthConstraints().tighten(width: mainAxisExtent) 220 | : constraints.heightConstraints().tighten(height: mainAxisExtent); 221 | } 222 | } 223 | 224 | @override 225 | Size getSize(BoxConstraints constraints) { 226 | final ScrollPosition position = controller.position; 227 | assert(position != null); 228 | final bool isHorizontalAxis = (position.axis == Axis.horizontal); 229 | 230 | return constraints.constrain(new Size( 231 | isHorizontalAxis ? mainAxisExtent : constraints.maxWidth, 232 | isHorizontalAxis ? constraints.maxHeight : mainAxisExtent)); 233 | } 234 | 235 | @override 236 | double getChildScrollRatio( 237 | Offset offsetUnit, double childExtent, RenderBox renderBox) { 238 | final RenderAbstractViewport viewport = 239 | RenderAbstractViewport.of(renderBox); 240 | assert(viewport != null); 241 | 242 | final ScrollPosition position = controller.position; 243 | assert(position != null); 244 | final bool isHorizontalAxis = (position.axis == Axis.horizontal); 245 | 246 | final Offset localPositionOffset = isHorizontalAxis 247 | ? new Offset(mainAxisExtent, 0.0) 248 | : new Offset(0.0, mainAxisExtent); //offsetUnit * mainAxisExtent; 249 | final Offset positionInViewport = 250 | renderBox.localToGlobal(localPositionOffset, ancestor: viewport); 251 | 252 | // One dimension should be 0.0, so this should be ok. 253 | final double distanceFromLeading = 254 | math.max(positionInViewport.dx, positionInViewport.dy); 255 | 256 | double scrollRatio = distanceFromLeading / 257 | (controller.position.viewportDimension + mainAxisExtent); 258 | return scrollRatio; 259 | } 260 | } 261 | 262 | /// A parallax delegate for a widget outside a scroll view, or for a widget where the parallax offset does 263 | /// not depend on its position within its first [Scrollable] parent. 264 | class ParallaxOutsideDelegate extends ParallaxWithAxisDirectionDelegate { 265 | /// Creates a delegate for a widget outside a scroll view. 266 | /// 267 | /// The [controller] and [flipDirection] arguments must not be null. 268 | const ParallaxOutsideDelegate({ 269 | @required ScrollController controller, 270 | AxisDirection direction, 271 | bool flipDirection = false, 272 | }) : super( 273 | controller: controller, 274 | direction: direction, 275 | flipDirection: flipDirection, 276 | ); 277 | 278 | @override 279 | BoxConstraints getConstraintsForChild(BoxConstraints constraints) { 280 | final AxisDirection parallaxDirection = _getParallaxDirection(); 281 | final Axis parallaxAxis = axisDirectionToAxis(parallaxDirection); 282 | 283 | return parallaxAxis == Axis.horizontal 284 | ? constraints.heightConstraints() 285 | : constraints.widthConstraints(); 286 | } 287 | 288 | @override 289 | double getChildScrollRatio( 290 | Offset offsetUnit, double childExtent, RenderBox renderBox) { 291 | double scrollRatio = 0.0; 292 | final ScrollPosition position = controller.position; 293 | final double offset = controller.offset; 294 | final double minScrollExtent = 295 | position?.minScrollExtent ?? double.negativeInfinity; 296 | final double maxScrollExtent = position?.maxScrollExtent ?? double.infinity; 297 | 298 | if (minScrollExtent.isFinite && maxScrollExtent.isFinite) { 299 | scrollRatio = 300 | (offset - minScrollExtent) / (maxScrollExtent - minScrollExtent); 301 | } 302 | return scrollRatio; 303 | } 304 | } 305 | 306 | /// Defers the parallax layout of its single child to a delegate. 307 | /// 308 | /// The delegate can determine the layout constraints for the child and can 309 | /// decide where to position the child. The delegate can also determine the size 310 | /// of the parent, but the size of the parent cannot depend on the size of the 311 | /// child. 312 | class RenderParallaxSingleChildLayoutBox extends RenderShiftedBox { 313 | /// Creates a render box that defers its parallax layout to a delegate. 314 | /// 315 | /// The [delegate] argument must not be null. 316 | RenderParallaxSingleChildLayoutBox({ 317 | RenderBox child, 318 | @required ParallaxDelegate delegate, 319 | }) : assert(delegate != null), 320 | _delegate = delegate, 321 | super(child); 322 | 323 | /// A delegate that controls this object's layout. 324 | ParallaxDelegate get delegate => _delegate; 325 | ParallaxDelegate _delegate; 326 | set delegate(ParallaxDelegate newDelegate) { 327 | assert(newDelegate != null); 328 | if (_delegate == newDelegate) { 329 | return; 330 | } 331 | final ParallaxDelegate oldDelegate = _delegate; 332 | if (newDelegate.runtimeType != oldDelegate.runtimeType || 333 | newDelegate.shouldRelayout(oldDelegate)) { 334 | markNeedsLayout(); 335 | } 336 | _delegate = newDelegate; 337 | if (attached) { 338 | oldDelegate?.controller?.removeListener(markNeedsLayout); 339 | newDelegate?.controller?.addListener(markNeedsLayout); 340 | } 341 | } 342 | 343 | @override 344 | void attach(PipelineOwner owner) { 345 | super.attach(owner); 346 | _delegate?.controller?.addListener(markNeedsLayout); 347 | } 348 | 349 | @override 350 | void detach() { 351 | _delegate?.controller?.removeListener(markNeedsLayout); 352 | super.detach(); 353 | } 354 | 355 | Size _getSize(BoxConstraints constraints) { 356 | return constraints.constrain(_delegate.getSize(constraints)); 357 | } 358 | 359 | @override 360 | void performLayout() { 361 | size = _getSize(constraints); 362 | if (child != null) { 363 | final BoxConstraints childConstraints = 364 | delegate.getConstraintsForChild(constraints); 365 | assert(childConstraints.debugAssertIsValid(isAppliedConstraint: true)); 366 | child.layout(childConstraints, parentUsesSize: !childConstraints.isTight); 367 | final BoxParentData childParentData = child.parentData; 368 | childParentData.offset = delegate.getPositionForChild( 369 | size, 370 | childConstraints.isTight ? childConstraints.smallest : child.size, 371 | this); 372 | } 373 | } 374 | } 375 | -------------------------------------------------------------------------------- /lib/src/widgets/parallax.dart: -------------------------------------------------------------------------------- 1 | import 'package:flutter/foundation.dart'; 2 | import 'package:flutter/widgets.dart'; 3 | import 'package:flutter/rendering.dart'; 4 | 5 | import '../rendering/parallax.dart'; 6 | 7 | /// A widget that applies a parallax effect on its child. 8 | /// 9 | /// There are three options for constructing a [Parallax]: 10 | /// 11 | /// 1. The [Parallax.inside], that computes the parallax offset from its position 12 | /// in its first [Scrollable] parent. 13 | /// Useful for list or grid items. 14 | /// 15 | /// 2. The [Parallax.outside], that computes the parallax offset from the percentage 16 | /// of the scrollable's container extent. 17 | /// Useful for a list or grid background. 18 | /// 19 | /// 3. The [Parallax.custom] takes a [ParallaxDelegate], which provides the ability 20 | /// to customize additional aspects of the child model. For example, a [ParallaxDelegate] 21 | /// can control the algorithm used to computes the parallax offset of the child within its parent. 22 | /// 23 | /// See also: 24 | /// 25 | /// * [ParallaxSingleChildLayout], which uses a delegate to control the parallax layout of 26 | /// a single child. 27 | class Parallax extends StatelessWidget { 28 | /// Creates a parallax widget for a widget inside a scroll view. 29 | /// 30 | /// The [mainAxisExtent] and [flipDirection] arguments must not be null. 31 | /// The [mainAxisExtent] argument must be positive. 32 | const Parallax.inside({ 33 | Key key, 34 | @required this.child, 35 | @required this.mainAxisExtent, 36 | this.direction, 37 | this.flipDirection = false, 38 | }) : assert(mainAxisExtent != null && mainAxisExtent >= 0.0), 39 | delegate = null, 40 | super(key: key); 41 | 42 | /// Creates a parallax widget for a widget outside a scroll view. 43 | /// 44 | /// The [controller] and [flipDirection] arguments must not be null. 45 | Parallax.outside({ 46 | Key key, 47 | @required this.child, 48 | @required ScrollController controller, 49 | this.direction, 50 | this.flipDirection = false, 51 | }) : assert(controller != null), 52 | mainAxisExtent = null, 53 | delegate = new ParallaxOutsideDelegate( 54 | controller: controller, 55 | direction: direction, 56 | flipDirection: flipDirection), 57 | super(key: key); 58 | 59 | /// Creates a parallax widget with a custom parallax layout. 60 | /// 61 | /// The [delegate] argument must not be null. 62 | const Parallax.custom({ 63 | Key key, 64 | @required this.child, 65 | @required this.delegate, 66 | }) : assert(delegate != null), 67 | mainAxisExtent = null, 68 | direction = null, 69 | flipDirection = null, 70 | super(key: key); 71 | 72 | /// The child of this widget. 73 | final Widget child; 74 | 75 | /// The delegate that controls the algorithm used to position the child within its parent. 76 | final ParallaxDelegate delegate; 77 | 78 | /// The extent of the child in the same axis as the scrolling. 79 | final double mainAxisExtent; 80 | 81 | /// The direction of the parallax effect when scroll offset increases. 82 | /// 83 | /// When null, the direction is the same as the [controller]. 84 | final AxisDirection direction; 85 | 86 | /// Whether to flip the given [direction]. 87 | /// 88 | /// Defaults to false. 89 | final bool flipDirection; 90 | 91 | @override 92 | Widget build(BuildContext context) { 93 | ParallaxDelegate parallaxDelegate = delegate; 94 | if (parallaxDelegate == null) { 95 | final ScrollPosition position = Scrollable.of(context).position; 96 | final ScrollController controller = new ScrollController(); 97 | controller.attach(position); 98 | parallaxDelegate = new ParallaxInsideDelegate( 99 | mainAxisExtent: mainAxisExtent, 100 | direction: direction, 101 | controller: controller, 102 | flipDirection: flipDirection, 103 | ); 104 | } 105 | 106 | return new ClipRect( 107 | child: new ParallaxSingleChildLayout( 108 | delegate: parallaxDelegate, 109 | child: child, 110 | ), 111 | ); 112 | } 113 | } 114 | 115 | /// A widget that defers the parallax layout of its single child to a delegate. 116 | /// 117 | /// The delegate can determine the layout constraints for the child and can 118 | /// decide where to position the child. The delegate can also determine the size 119 | /// of the parent, but the size of the parent cannot depend on the size of the 120 | /// child. 121 | /// 122 | /// See also: 123 | /// 124 | /// * [ParallaxDelegate], which controls the parallax layout of the child. 125 | class ParallaxSingleChildLayout extends SingleChildRenderObjectWidget { 126 | /// Creates a custom single child layout. 127 | /// 128 | /// The [delegate] argument must not be null. 129 | const ParallaxSingleChildLayout({ 130 | Key key, 131 | @required this.delegate, 132 | Widget child, 133 | }) : assert(delegate != null), 134 | super(key: key, child: child); 135 | 136 | /// The delegate that controls the layout of the child. 137 | final ParallaxDelegate delegate; 138 | 139 | @override 140 | RenderParallaxSingleChildLayoutBox createRenderObject(BuildContext context) { 141 | return new RenderParallaxSingleChildLayoutBox(delegate: delegate); 142 | } 143 | 144 | @override 145 | void updateRenderObject( 146 | BuildContext context, RenderParallaxSingleChildLayoutBox renderObject) { 147 | renderObject.delegate = delegate; 148 | } 149 | } 150 | -------------------------------------------------------------------------------- /pubspec.yaml: -------------------------------------------------------------------------------- 1 | name: flutter_parallax 2 | description: A Flutter widget that moves according to a scroll controller. 3 | version: 0.1.2 4 | author: Romain Rastel 5 | homepage: https://github.com/letsar/flutter_parallax 6 | 7 | dependencies: 8 | flutter: 9 | sdk: flutter 10 | 11 | dev_dependencies: 12 | test: ^0.12.0 13 | flutter_test: 14 | sdk: flutter 15 | 16 | environment: 17 | sdk: ">=1.19.0 <3.0.0" -------------------------------------------------------------------------------- /test/flutter_parallax_test.dart: -------------------------------------------------------------------------------- 1 | import 'package:test/test.dart'; 2 | 3 | import 'package:flutter_parallax/flutter_parallax.dart'; 4 | 5 | void main() {} 6 | --------------------------------------------------------------------------------