├── .gitignore ├── AUTHORS ├── CHANGELOG.md ├── LICENSE ├── README.md ├── analysis_options.yaml ├── example ├── .gitignore ├── .metadata ├── README.md ├── android │ ├── .gitignore │ ├── app │ │ ├── build.gradle │ │ └── src │ │ │ ├── debug │ │ │ └── AndroidManifest.xml │ │ │ ├── main │ │ │ ├── AndroidManifest.xml │ │ │ ├── kotlin │ │ │ │ └── com │ │ │ │ │ └── example │ │ │ │ │ └── example │ │ │ │ │ └── MainActivity.kt │ │ │ └── res │ │ │ │ ├── drawable-v21 │ │ │ │ └── launch_background.xml │ │ │ │ ├── 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-night │ │ │ │ └── styles.xml │ │ │ │ └── values │ │ │ │ └── styles.xml │ │ │ └── profile │ │ │ └── AndroidManifest.xml │ ├── build.gradle │ ├── gradle.properties │ ├── gradle │ │ └── wrapper │ │ │ └── gradle-wrapper.properties │ └── settings.gradle ├── ios │ ├── .gitignore │ ├── Flutter │ │ ├── AppFrameworkInfo.plist │ │ ├── Debug.xcconfig │ │ └── Release.xcconfig │ ├── Runner.xcodeproj │ │ ├── project.pbxproj │ │ ├── project.xcworkspace │ │ │ ├── contents.xcworkspacedata │ │ │ └── xcshareddata │ │ │ │ ├── IDEWorkspaceChecks.plist │ │ │ │ └── WorkspaceSettings.xcsettings │ │ └── xcshareddata │ │ │ └── xcschemes │ │ │ └── Runner.xcscheme │ ├── Runner.xcworkspace │ │ ├── contents.xcworkspacedata │ │ └── xcshareddata │ │ │ ├── IDEWorkspaceChecks.plist │ │ │ └── WorkspaceSettings.xcsettings │ └── Runner │ │ ├── AppDelegate.swift │ │ ├── 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 │ │ └── Runner-Bridging-Header.h ├── lib │ └── main.dart ├── pubspec.lock └── pubspec.yaml ├── lib └── infinite_listview.dart ├── pubspec.lock └── pubspec.yaml /.gitignore: -------------------------------------------------------------------------------- 1 | Thumbs.db 2 | .DS_Store 3 | .atom/ 4 | .idea/ 5 | .vscode/ 6 | 7 | .packages 8 | .pub/ 9 | .dart_tool/ 10 | 11 | Podfile 12 | Podfile.lock 13 | Pods/ 14 | .symlinks/ 15 | ios/.generated/ 16 | ios/Flutter/Generated.xcconfig 17 | ios/Runner/GeneratedPluginRegistrant.* 18 | 19 | local.properties 20 | .gradle/ 21 | gradlew 22 | gradlew.bat 23 | gradle-wrapper.jar 24 | *.iml 25 | 26 | GeneratedPluginRegistrant.h 27 | GeneratedPluginRegistrant.m 28 | GeneratedPluginRegistrant.java 29 | build/ 30 | .flutter-plugins 31 | -------------------------------------------------------------------------------- /AUTHORS: -------------------------------------------------------------------------------- 1 | # Below is a list of people and organizations that have contributed 2 | # to this project. Names should be added to the list like so: 3 | # 4 | # Name/Organization 5 | 6 | Simon Lightfoot 7 | -------------------------------------------------------------------------------- /CHANGELOG.md: -------------------------------------------------------------------------------- 1 | ## 1.1.0 2 | * Add null safety. 3 | * Add new ListView parameters. 4 | * Fixed default controller initialization bug. 5 | * Widget can now be const. 6 | 7 | ## 1.0.1+1 8 | * Added New Flutter Community Banner. 9 | 10 | ## 1.0.1 11 | * Added anchor parameter for aligning Viewport. 12 | * Fixed bug with save and restore of scroll position. 13 | 14 | ## 1.0.0 15 | * Initial release. 16 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) 2018 Simon Lightfoot 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 | 2 | [![Flutter Community: infinite_listview](https://fluttercommunity.dev/_github/header/infinite_listview?v1.0.1+1)](https://github.com/fluttercommunity/community) 3 | 4 | # Flutter Infinite ListView 5 | 6 | [![pub package](https://img.shields.io/pub/v/infinite_listview.svg)](https://pub.dartlang.org/packages/infinite_listview) 7 | 8 | ListView with items that can be scrolled infinitely in both directions. 9 | 10 | ## Quick Usage 11 | 12 | Replace your existing `ListView` with `InfiniteListView`. Builder pattern must be used because of its infinite nature. 13 | 14 | ### Example 15 | ![Example](https://github.com/fluttercommunity/flutter_infinite_listview/raw/readme/example.gif) 16 | 17 | ## Bugs/Requests 18 | If you encounter any problems feel free to open an issue. If you feel the library is 19 | missing a feature, please raise a ticket on Github and I'll look into it. 20 | Pull Request are also welcome. 21 | -------------------------------------------------------------------------------- /analysis_options.yaml: -------------------------------------------------------------------------------- 1 | linter: 2 | rules: 3 | - always_declare_return_types 4 | - always_put_control_body_on_new_line 5 | - always_require_non_null_named_parameters 6 | - annotate_overrides 7 | - avoid_bool_literals_in_conditional_expressions 8 | - avoid_catches_without_on_clauses 9 | - avoid_catching_errors 10 | - avoid_classes_with_only_static_members 11 | - avoid_double_and_int_checks 12 | - avoid_empty_else 13 | - avoid_field_initializers_in_const_classes 14 | - avoid_function_literals_in_foreach_calls 15 | - avoid_init_to_null 16 | - avoid_js_rounded_ints 17 | - avoid_null_checks_in_equality_operators 18 | - avoid_positional_boolean_parameters 19 | - avoid_private_typedef_functions 20 | - avoid_relative_lib_imports 21 | - avoid_renaming_method_parameters 22 | - avoid_return_types_on_setters 23 | - avoid_returning_null 24 | - avoid_returning_this 25 | #- avoid_setters_without_getters 26 | - avoid_single_cascade_in_expression_statements 27 | - avoid_slow_async_io 28 | - avoid_types_as_parameter_names 29 | - avoid_unused_constructor_parameters 30 | - await_only_futures 31 | - camel_case_types 32 | - cancel_subscriptions 33 | - close_sinks 34 | - comment_references 35 | - constant_identifier_names 36 | - control_flow_in_finally 37 | - directives_ordering 38 | - empty_catches 39 | - empty_constructor_bodies 40 | - empty_statements 41 | - hash_and_equals 42 | - implementation_imports 43 | - invariant_booleans 44 | - iterable_contains_unrelated_type 45 | - join_return_with_assignment 46 | - library_names 47 | - library_prefixes 48 | - list_remove_unrelated_type 49 | - literal_only_boolean_expressions 50 | - no_adjacent_strings_in_list 51 | - no_duplicate_case_values 52 | - non_constant_identifier_names 53 | - one_member_abstracts 54 | - only_throw_errors 55 | - overridden_fields 56 | #- package_api_docs 57 | - package_names 58 | - package_prefixed_library_names 59 | - parameter_assignments 60 | - prefer_adjacent_string_concatenation 61 | - prefer_asserts_in_initializer_lists 62 | - prefer_bool_in_asserts 63 | - prefer_collection_literals 64 | - prefer_conditional_assignment 65 | - prefer_const_constructors 66 | - prefer_const_declarations 67 | - prefer_constructors_over_static_methods 68 | - prefer_contains 69 | - prefer_equal_for_default_values 70 | - prefer_final_fields 71 | - prefer_final_locals 72 | - prefer_foreach 73 | - prefer_function_declarations_over_variables 74 | - prefer_generic_function_type_aliases 75 | - prefer_initializing_formals 76 | - prefer_interpolation_to_compose_strings 77 | - prefer_is_empty 78 | - prefer_is_not_empty 79 | - prefer_iterable_whereType 80 | - prefer_single_quotes 81 | - prefer_typing_uninitialized_variables 82 | #- public_member_api_docs 83 | - recursive_getters 84 | - slash_for_doc_comments 85 | - sort_constructors_first 86 | - sort_unnamed_constructors_first 87 | - super_goes_last 88 | - test_types_in_equals 89 | - throw_in_finally 90 | - type_annotate_public_apis 91 | - type_init_formals 92 | - unawaited_futures 93 | - unnecessary_brace_in_string_interps 94 | - unnecessary_getters_setters 95 | - unnecessary_lambdas 96 | - unnecessary_null_aware_assignments 97 | - unnecessary_null_in_if_null_operators 98 | - unnecessary_parenthesis 99 | - unnecessary_statements 100 | - unnecessary_this 101 | - unrelated_type_equality_checks 102 | - use_rethrow_when_possible 103 | - use_setters_to_change_properties 104 | - use_string_buffers 105 | - use_to_and_as_if_applicable 106 | - valid_regexps 107 | - void_checks -------------------------------------------------------------------------------- /example/.gitignore: -------------------------------------------------------------------------------- 1 | # Miscellaneous 2 | *.class 3 | *.log 4 | *.pyc 5 | *.swp 6 | .DS_Store 7 | .atom/ 8 | .buildlog/ 9 | .history 10 | .svn/ 11 | 12 | # IntelliJ related 13 | *.iml 14 | *.ipr 15 | *.iws 16 | .idea/ 17 | 18 | # The .vscode folder contains launch configuration and tasks you configure in 19 | # VS Code which you may wish to be included in version control, so this line 20 | # is commented out by default. 21 | #.vscode/ 22 | 23 | # Flutter/Dart/Pub related 24 | **/doc/api/ 25 | **/ios/Flutter/.last_build_id 26 | .dart_tool/ 27 | .flutter-plugins 28 | .flutter-plugins-dependencies 29 | .packages 30 | .pub-cache/ 31 | .pub/ 32 | /build/ 33 | 34 | # Web related 35 | lib/generated_plugin_registrant.dart 36 | 37 | # Symbolication related 38 | app.*.symbols 39 | 40 | # Obfuscation related 41 | app.*.map.json 42 | 43 | # Android Studio will place build artifacts here 44 | /android/app/debug 45 | /android/app/profile 46 | /android/app/release 47 | -------------------------------------------------------------------------------- /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: cc9b78fc5c4a4d2d51316d9626523336230a89a9 8 | channel: dev 9 | 10 | project_type: app 11 | -------------------------------------------------------------------------------- /example/README.md: -------------------------------------------------------------------------------- 1 | # example 2 | 3 | A new Flutter project. 4 | 5 | ## Getting Started 6 | 7 | This project is a starting point for a Flutter application. 8 | 9 | A few resources to get you started if this is your first Flutter project: 10 | 11 | - [Lab: Write your first Flutter app](https://flutter.dev/docs/get-started/codelab) 12 | - [Cookbook: Useful Flutter samples](https://flutter.dev/docs/cookbook) 13 | 14 | For help getting started with Flutter, view our 15 | [online documentation](https://flutter.dev/docs), which offers tutorials, 16 | samples, guidance on mobile development, and a full API reference. 17 | -------------------------------------------------------------------------------- /example/android/.gitignore: -------------------------------------------------------------------------------- 1 | gradle-wrapper.jar 2 | /.gradle 3 | /captures/ 4 | /gradlew 5 | /gradlew.bat 6 | /local.properties 7 | GeneratedPluginRegistrant.java 8 | 9 | # Remember to never publicly share your keystore. 10 | # See https://flutter.dev/docs/deployment/android#reference-the-keystore-from-the-app 11 | key.properties 12 | -------------------------------------------------------------------------------- /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 | def flutterVersionCode = localProperties.getProperty('flutter.versionCode') 15 | if (flutterVersionCode == null) { 16 | flutterVersionCode = '1' 17 | } 18 | 19 | def flutterVersionName = localProperties.getProperty('flutter.versionName') 20 | if (flutterVersionName == null) { 21 | flutterVersionName = '1.0' 22 | } 23 | 24 | apply plugin: 'com.android.application' 25 | apply plugin: 'kotlin-android' 26 | apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle" 27 | 28 | android { 29 | compileSdkVersion 30 30 | 31 | sourceSets { 32 | main.java.srcDirs += 'src/main/kotlin' 33 | } 34 | 35 | defaultConfig { 36 | // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html). 37 | applicationId "com.example.example" 38 | minSdkVersion 16 39 | targetSdkVersion 30 40 | versionCode flutterVersionCode.toInteger() 41 | versionName flutterVersionName 42 | } 43 | 44 | buildTypes { 45 | release { 46 | // TODO: Add your own signing config for the release build. 47 | // Signing with the debug keys for now, so `flutter run --release` works. 48 | signingConfig signingConfigs.debug 49 | } 50 | } 51 | } 52 | 53 | flutter { 54 | source '../..' 55 | } 56 | 57 | dependencies { 58 | implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version" 59 | } 60 | -------------------------------------------------------------------------------- /example/android/app/src/debug/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 3 | 6 | 7 | 8 | -------------------------------------------------------------------------------- /example/android/app/src/main/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 3 | 6 | 13 | 17 | 21 | 26 | 30 | 31 | 32 | 33 | 34 | 35 | 37 | 40 | 41 | 42 | -------------------------------------------------------------------------------- /example/android/app/src/main/kotlin/com/example/example/MainActivity.kt: -------------------------------------------------------------------------------- 1 | package com.example.example 2 | 3 | import io.flutter.embedding.android.FlutterActivity 4 | 5 | class MainActivity: FlutterActivity() { 6 | } 7 | -------------------------------------------------------------------------------- /example/android/app/src/main/res/drawable-v21/launch_background.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 12 | 13 | -------------------------------------------------------------------------------- /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/fluttercommunity/flutter_infinite_listview/403d6db0707e26c7190e25d485a2783b25b79271/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/fluttercommunity/flutter_infinite_listview/403d6db0707e26c7190e25d485a2783b25b79271/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/fluttercommunity/flutter_infinite_listview/403d6db0707e26c7190e25d485a2783b25b79271/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/fluttercommunity/flutter_infinite_listview/403d6db0707e26c7190e25d485a2783b25b79271/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/fluttercommunity/flutter_infinite_listview/403d6db0707e26c7190e25d485a2783b25b79271/example/android/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png -------------------------------------------------------------------------------- /example/android/app/src/main/res/values-night/styles.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 9 | 15 | 18 | 19 | -------------------------------------------------------------------------------- /example/android/app/src/main/res/values/styles.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 9 | 15 | 18 | 19 | -------------------------------------------------------------------------------- /example/android/app/src/profile/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 3 | 6 | 7 | 8 | -------------------------------------------------------------------------------- /example/android/build.gradle: -------------------------------------------------------------------------------- 1 | buildscript { 2 | ext.kotlin_version = '1.3.50' 3 | repositories { 4 | google() 5 | jcenter() 6 | } 7 | 8 | dependencies { 9 | classpath 'com.android.tools.build:gradle:4.1.0' 10 | classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version" 11 | } 12 | } 13 | 14 | allprojects { 15 | repositories { 16 | google() 17 | jcenter() 18 | } 19 | } 20 | 21 | rootProject.buildDir = '../build' 22 | subprojects { 23 | project.buildDir = "${rootProject.buildDir}/${project.name}" 24 | } 25 | subprojects { 26 | project.evaluationDependsOn(':app') 27 | } 28 | 29 | task clean(type: Delete) { 30 | delete rootProject.buildDir 31 | } 32 | -------------------------------------------------------------------------------- /example/android/gradle.properties: -------------------------------------------------------------------------------- 1 | org.gradle.jvmargs=-Xmx1536M 2 | android.useAndroidX=true 3 | android.enableJetifier=true 4 | -------------------------------------------------------------------------------- /example/android/gradle/wrapper/gradle-wrapper.properties: -------------------------------------------------------------------------------- 1 | #Fri Jun 23 08:50:38 CEST 2017 2 | distributionBase=GRADLE_USER_HOME 3 | distributionPath=wrapper/dists 4 | zipStoreBase=GRADLE_USER_HOME 5 | zipStorePath=wrapper/dists 6 | distributionUrl=https\://services.gradle.org/distributions/gradle-6.7-all.zip 7 | -------------------------------------------------------------------------------- /example/android/settings.gradle: -------------------------------------------------------------------------------- 1 | include ':app' 2 | 3 | def localPropertiesFile = new File(rootProject.projectDir, "local.properties") 4 | def properties = new Properties() 5 | 6 | assert localPropertiesFile.exists() 7 | localPropertiesFile.withReader("UTF-8") { reader -> properties.load(reader) } 8 | 9 | def flutterSdkPath = properties.getProperty("flutter.sdk") 10 | assert flutterSdkPath != null, "flutter.sdk not set in local.properties" 11 | apply from: "$flutterSdkPath/packages/flutter_tools/gradle/app_plugin_loader.gradle" 12 | -------------------------------------------------------------------------------- /example/ios/.gitignore: -------------------------------------------------------------------------------- 1 | *.mode1v3 2 | *.mode2v3 3 | *.moved-aside 4 | *.pbxuser 5 | *.perspectivev3 6 | **/*sync/ 7 | .sconsign.dblite 8 | .tags* 9 | **/.vagrant/ 10 | **/DerivedData/ 11 | Icon? 12 | **/Pods/ 13 | **/.symlinks/ 14 | profile 15 | xcuserdata 16 | **/.generated/ 17 | Flutter/App.framework 18 | Flutter/Flutter.framework 19 | Flutter/Flutter.podspec 20 | Flutter/Generated.xcconfig 21 | Flutter/app.flx 22 | Flutter/app.zip 23 | Flutter/flutter_assets/ 24 | Flutter/flutter_export_environment.sh 25 | ServiceDefinitions.json 26 | Runner/GeneratedPluginRegistrant.* 27 | 28 | # Exceptions to above rules. 29 | !default.mode1v3 30 | !default.mode2v3 31 | !default.pbxuser 32 | !default.perspectivev3 33 | -------------------------------------------------------------------------------- /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 | MinimumOSVersion 24 | 8.0 25 | 26 | 27 | -------------------------------------------------------------------------------- /example/ios/Flutter/Debug.xcconfig: 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/example/ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | PreviewsEnabled 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /example/ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme: -------------------------------------------------------------------------------- 1 | 2 | 5 | 8 | 9 | 15 | 21 | 22 | 23 | 24 | 25 | 30 | 31 | 32 | 33 | 39 | 40 | 41 | 42 | 43 | 44 | 54 | 56 | 62 | 63 | 64 | 65 | 66 | 67 | 73 | 75 | 81 | 82 | 83 | 84 | 86 | 87 | 90 | 91 | 92 | -------------------------------------------------------------------------------- /example/ios/Runner.xcworkspace/contents.xcworkspacedata: -------------------------------------------------------------------------------- 1 | 2 | 4 | 6 | 7 | 8 | -------------------------------------------------------------------------------- /example/ios/Runner.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | IDEDidComputeMac32BitWarning 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /example/ios/Runner.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | PreviewsEnabled 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /example/ios/Runner/AppDelegate.swift: -------------------------------------------------------------------------------- 1 | import UIKit 2 | import Flutter 3 | 4 | @UIApplicationMain 5 | @objc class AppDelegate: FlutterAppDelegate { 6 | override func application( 7 | _ application: UIApplication, 8 | didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]? 9 | ) -> Bool { 10 | GeneratedPluginRegistrant.register(with: self) 11 | return super.application(application, didFinishLaunchingWithOptions: launchOptions) 12 | } 13 | } 14 | -------------------------------------------------------------------------------- /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 | 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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/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 | $(DEVELOPMENT_LANGUAGE) 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 | $(FLUTTER_BUILD_NAME) 19 | CFBundleSignature 20 | ???? 21 | CFBundleVersion 22 | $(FLUTTER_BUILD_NUMBER) 23 | LSRequiresIPhoneOS 24 | 25 | UILaunchStoryboardName 26 | LaunchScreen 27 | UIMainStoryboardFile 28 | Main 29 | UISupportedInterfaceOrientations 30 | 31 | UIInterfaceOrientationPortrait 32 | UIInterfaceOrientationLandscapeLeft 33 | UIInterfaceOrientationLandscapeRight 34 | 35 | UISupportedInterfaceOrientations~ipad 36 | 37 | UIInterfaceOrientationPortrait 38 | UIInterfaceOrientationPortraitUpsideDown 39 | UIInterfaceOrientationLandscapeLeft 40 | UIInterfaceOrientationLandscapeRight 41 | 42 | UIViewControllerBasedStatusBarAppearance 43 | 44 | 45 | 46 | -------------------------------------------------------------------------------- /example/ios/Runner/Runner-Bridging-Header.h: -------------------------------------------------------------------------------- 1 | #import "GeneratedPluginRegistrant.h" 2 | -------------------------------------------------------------------------------- /example/lib/main.dart: -------------------------------------------------------------------------------- 1 | import 'package:flutter/material.dart'; 2 | import 'package:infinite_listview/infinite_listview.dart'; 3 | 4 | void main() => runApp(ExampleApp()); 5 | 6 | class ExampleApp extends StatelessWidget { 7 | @override 8 | Widget build(BuildContext context) { 9 | return MaterialApp( 10 | debugShowCheckedModeBanner: false, 11 | home: ExampleScreen(), 12 | ); 13 | } 14 | } 15 | 16 | class ExampleScreen extends StatefulWidget { 17 | @override 18 | _ExampleScreenState createState() => _ExampleScreenState(); 19 | } 20 | 21 | class _ExampleScreenState extends State { 22 | final InfiniteScrollController _infiniteController = InfiniteScrollController( 23 | initialScrollOffset: 0.0, 24 | ); 25 | 26 | @override 27 | Widget build(BuildContext context) { 28 | return DefaultTabController( 29 | length: 3, 30 | child: Scaffold( 31 | appBar: AppBar( 32 | title: const Text('Example'), 33 | actions: [ 34 | IconButton( 35 | icon: const Icon(Icons.arrow_downward), 36 | onPressed: () { 37 | _infiniteController.animateTo(_infiniteController.offset + 2000.0, 38 | duration: const Duration(milliseconds: 250), curve: Curves.easeIn); 39 | }, 40 | ), 41 | IconButton( 42 | icon: const Icon(Icons.arrow_upward), 43 | onPressed: () { 44 | _infiniteController.animateTo(_infiniteController.offset - 2000.0, 45 | duration: const Duration(milliseconds: 250), curve: Curves.easeIn); 46 | }, 47 | ), 48 | ], 49 | bottom: const TabBar( 50 | tabs: [ 51 | Tab(text: 'First'), 52 | Tab(text: 'Second'), 53 | Tab(text: 'Third'), 54 | ], 55 | ), 56 | ), 57 | body: TabBarView( 58 | children: [ 59 | _buildTab(0), 60 | _buildTab(1), 61 | _buildTab(2), 62 | ], 63 | ), 64 | ), 65 | ); 66 | } 67 | 68 | Widget _buildTab(int tab) { 69 | return InfiniteListView.separated( 70 | key: PageStorageKey(tab), 71 | controller: _infiniteController, 72 | itemBuilder: (BuildContext context, int index) { 73 | return Material( 74 | child: InkWell( 75 | onTap: () {}, 76 | child: ListTile( 77 | title: Text('Tab $tab Item #$index'), 78 | subtitle: Text('Subtitle $index'), 79 | trailing: const Icon(Icons.chevron_right), 80 | ), 81 | ), 82 | ); 83 | }, 84 | separatorBuilder: (BuildContext context, int index) => const Divider(height: 2.0), 85 | anchor: 0.5, 86 | ); 87 | } 88 | } 89 | -------------------------------------------------------------------------------- /example/pubspec.lock: -------------------------------------------------------------------------------- 1 | # Generated by pub 2 | # See https://dart.dev/tools/pub/glossary#lockfile 3 | packages: 4 | async: 5 | dependency: transitive 6 | description: 7 | name: async 8 | url: "https://pub.dartlang.org" 9 | source: hosted 10 | version: "2.5.0" 11 | boolean_selector: 12 | dependency: transitive 13 | description: 14 | name: boolean_selector 15 | url: "https://pub.dartlang.org" 16 | source: hosted 17 | version: "2.1.0" 18 | characters: 19 | dependency: transitive 20 | description: 21 | name: characters 22 | url: "https://pub.dartlang.org" 23 | source: hosted 24 | version: "1.1.0" 25 | charcode: 26 | dependency: transitive 27 | description: 28 | name: charcode 29 | url: "https://pub.dartlang.org" 30 | source: hosted 31 | version: "1.2.0" 32 | clock: 33 | dependency: transitive 34 | description: 35 | name: clock 36 | url: "https://pub.dartlang.org" 37 | source: hosted 38 | version: "1.1.0" 39 | collection: 40 | dependency: transitive 41 | description: 42 | name: collection 43 | url: "https://pub.dartlang.org" 44 | source: hosted 45 | version: "1.15.0" 46 | fake_async: 47 | dependency: transitive 48 | description: 49 | name: fake_async 50 | url: "https://pub.dartlang.org" 51 | source: hosted 52 | version: "1.2.0" 53 | flutter: 54 | dependency: "direct main" 55 | description: flutter 56 | source: sdk 57 | version: "0.0.0" 58 | flutter_test: 59 | dependency: "direct dev" 60 | description: flutter 61 | source: sdk 62 | version: "0.0.0" 63 | infinite_listview: 64 | dependency: "direct main" 65 | description: 66 | path: ".." 67 | relative: true 68 | source: path 69 | version: "1.1.0" 70 | matcher: 71 | dependency: transitive 72 | description: 73 | name: matcher 74 | url: "https://pub.dartlang.org" 75 | source: hosted 76 | version: "0.12.10" 77 | meta: 78 | dependency: transitive 79 | description: 80 | name: meta 81 | url: "https://pub.dartlang.org" 82 | source: hosted 83 | version: "1.3.0" 84 | path: 85 | dependency: transitive 86 | description: 87 | name: path 88 | url: "https://pub.dartlang.org" 89 | source: hosted 90 | version: "1.8.0" 91 | sky_engine: 92 | dependency: transitive 93 | description: flutter 94 | source: sdk 95 | version: "0.0.99" 96 | source_span: 97 | dependency: transitive 98 | description: 99 | name: source_span 100 | url: "https://pub.dartlang.org" 101 | source: hosted 102 | version: "1.8.1" 103 | stack_trace: 104 | dependency: transitive 105 | description: 106 | name: stack_trace 107 | url: "https://pub.dartlang.org" 108 | source: hosted 109 | version: "1.10.0" 110 | stream_channel: 111 | dependency: transitive 112 | description: 113 | name: stream_channel 114 | url: "https://pub.dartlang.org" 115 | source: hosted 116 | version: "2.1.0" 117 | string_scanner: 118 | dependency: transitive 119 | description: 120 | name: string_scanner 121 | url: "https://pub.dartlang.org" 122 | source: hosted 123 | version: "1.1.0" 124 | term_glyph: 125 | dependency: transitive 126 | description: 127 | name: term_glyph 128 | url: "https://pub.dartlang.org" 129 | source: hosted 130 | version: "1.2.0" 131 | test_api: 132 | dependency: transitive 133 | description: 134 | name: test_api 135 | url: "https://pub.dartlang.org" 136 | source: hosted 137 | version: "0.2.19" 138 | typed_data: 139 | dependency: transitive 140 | description: 141 | name: typed_data 142 | url: "https://pub.dartlang.org" 143 | source: hosted 144 | version: "1.3.0" 145 | vector_math: 146 | dependency: transitive 147 | description: 148 | name: vector_math 149 | url: "https://pub.dartlang.org" 150 | source: hosted 151 | version: "2.1.0" 152 | sdks: 153 | dart: ">=2.12.0 <3.0.0" 154 | -------------------------------------------------------------------------------- /example/pubspec.yaml: -------------------------------------------------------------------------------- 1 | name: example 2 | description: Flutter Infinite Listview Example 3 | version: 1.1.0 4 | 5 | environment: 6 | sdk: '>=2.12.0 <3.0.0' 7 | 8 | dependencies: 9 | infinite_listview: 10 | path: ../ 11 | flutter: 12 | sdk: flutter 13 | 14 | dev_dependencies: 15 | flutter_test: 16 | sdk: flutter 17 | 18 | flutter: 19 | uses-material-design: true 20 | -------------------------------------------------------------------------------- /lib/infinite_listview.dart: -------------------------------------------------------------------------------- 1 | library infinite_listview; 2 | 3 | import 'dart:math' as math; 4 | 5 | import 'package:flutter/gestures.dart' show DragStartBehavior; 6 | import 'package:flutter/material.dart'; 7 | import 'package:flutter/rendering.dart'; 8 | import 'package:flutter/widgets.dart'; 9 | 10 | /// Infinite ListView 11 | /// 12 | /// ListView that builds its children with to an infinite extent. 13 | /// 14 | class InfiniteListView extends StatefulWidget { 15 | /// See [ListView.builder] 16 | const InfiniteListView.builder({ 17 | Key? key, 18 | this.scrollDirection = Axis.vertical, 19 | this.reverse = false, 20 | this.controller, 21 | this.physics, 22 | this.padding, 23 | this.itemExtent, 24 | required this.itemBuilder, 25 | this.itemCount, 26 | this.addAutomaticKeepAlives = true, 27 | this.addRepaintBoundaries = true, 28 | this.addSemanticIndexes = true, 29 | this.cacheExtent, 30 | this.anchor = 0.0, 31 | this.dragStartBehavior = DragStartBehavior.start, 32 | this.keyboardDismissBehavior = ScrollViewKeyboardDismissBehavior.manual, 33 | this.restorationId, 34 | this.clipBehavior = Clip.hardEdge, 35 | }) : separatorBuilder = null, 36 | super(key: key); 37 | 38 | /// See [ListView.separated] 39 | const InfiniteListView.separated({ 40 | Key? key, 41 | this.scrollDirection = Axis.vertical, 42 | this.reverse = false, 43 | this.controller, 44 | this.physics, 45 | this.padding, 46 | required this.itemBuilder, 47 | required this.separatorBuilder, 48 | this.itemCount, 49 | this.addAutomaticKeepAlives = true, 50 | this.addRepaintBoundaries = true, 51 | this.addSemanticIndexes = true, 52 | this.cacheExtent, 53 | this.anchor = 0.0, 54 | this.dragStartBehavior = DragStartBehavior.start, 55 | this.keyboardDismissBehavior = ScrollViewKeyboardDismissBehavior.manual, 56 | this.restorationId, 57 | this.clipBehavior = Clip.hardEdge, 58 | }) : itemExtent = null, 59 | super(key: key); 60 | 61 | /// See: [ScrollView.scrollDirection] 62 | final Axis scrollDirection; 63 | 64 | /// See: [ScrollView.reverse] 65 | final bool reverse; 66 | 67 | /// See: [ScrollView.controller] 68 | final InfiniteScrollController? controller; 69 | 70 | /// See: [ScrollView.physics] 71 | final ScrollPhysics? physics; 72 | 73 | /// See: [BoxScrollView.padding] 74 | final EdgeInsets? padding; 75 | 76 | /// See: [ListView.builder] 77 | final IndexedWidgetBuilder itemBuilder; 78 | 79 | /// See: [ListView.separated] 80 | final IndexedWidgetBuilder? separatorBuilder; 81 | 82 | /// See: [SliverChildBuilderDelegate.childCount] 83 | final int? itemCount; 84 | 85 | /// See: [ListView.itemExtent] 86 | final double? itemExtent; 87 | 88 | /// See: [ScrollView.cacheExtent] 89 | final double? cacheExtent; 90 | 91 | /// See: [ScrollView.anchor] 92 | final double anchor; 93 | 94 | /// See: [SliverChildBuilderDelegate.addAutomaticKeepAlives] 95 | final bool addAutomaticKeepAlives; 96 | 97 | /// See: [SliverChildBuilderDelegate.addRepaintBoundaries] 98 | final bool addRepaintBoundaries; 99 | 100 | /// See: [SliverChildBuilderDelegate.addSemanticIndexes] 101 | final bool addSemanticIndexes; 102 | 103 | /// See: [ScrollView.dragStartBehavior] 104 | final DragStartBehavior dragStartBehavior; 105 | 106 | /// See: [ScrollView.keyboardDismissBehavior] 107 | final ScrollViewKeyboardDismissBehavior keyboardDismissBehavior; 108 | 109 | /// See: [ScrollView.restorationId] 110 | final String? restorationId; 111 | 112 | /// See: [ScrollView.clipBehavior] 113 | final Clip clipBehavior; 114 | 115 | @override 116 | _InfiniteListViewState createState() => _InfiniteListViewState(); 117 | } 118 | 119 | class _InfiniteListViewState extends State { 120 | InfiniteScrollController? _controller; 121 | 122 | InfiniteScrollController get _effectiveController => widget.controller ?? _controller!; 123 | 124 | @override 125 | void initState() { 126 | super.initState(); 127 | if (widget.controller == null) { 128 | _controller = InfiniteScrollController(); 129 | } 130 | } 131 | 132 | @override 133 | void didUpdateWidget(InfiniteListView oldWidget) { 134 | super.didUpdateWidget(oldWidget); 135 | if (widget.controller == null && oldWidget.controller != null) { 136 | _controller = InfiniteScrollController(); 137 | } else if (widget.controller != null && oldWidget.controller == null) { 138 | _controller!.dispose(); 139 | _controller = null; 140 | } 141 | } 142 | 143 | @override 144 | void dispose() { 145 | _controller?.dispose(); 146 | super.dispose(); 147 | } 148 | 149 | @override 150 | Widget build(BuildContext context) { 151 | final List slivers = _buildSlivers(context, negative: false); 152 | final List negativeSlivers = _buildSlivers(context, negative: true); 153 | final AxisDirection axisDirection = _getDirection(context); 154 | final scrollPhysics = widget.physics ?? const AlwaysScrollableScrollPhysics(); 155 | return Scrollable( 156 | axisDirection: axisDirection, 157 | controller: _effectiveController, 158 | physics: scrollPhysics, 159 | viewportBuilder: (BuildContext context, ViewportOffset offset) { 160 | return Builder(builder: (BuildContext context) { 161 | /// Build negative [ScrollPosition] for the negative scrolling [Viewport]. 162 | final state = Scrollable.of(context)!; 163 | final negativeOffset = _InfiniteScrollPosition( 164 | physics: scrollPhysics, 165 | context: state, 166 | initialPixels: -offset.pixels, 167 | keepScrollOffset: _effectiveController.keepScrollOffset, 168 | negativeScroll: true, 169 | ); 170 | 171 | /// Keep the negative scrolling [Viewport] positioned to the [ScrollPosition]. 172 | offset.addListener(() { 173 | negativeOffset._forceNegativePixels(offset.pixels); 174 | }); 175 | 176 | /// Stack the two [Viewport]s on top of each other so they move in sync. 177 | return Stack( 178 | children: [ 179 | Viewport( 180 | axisDirection: flipAxisDirection(axisDirection), 181 | anchor: 1.0 - widget.anchor, 182 | offset: negativeOffset, 183 | slivers: negativeSlivers, 184 | cacheExtent: widget.cacheExtent, 185 | ), 186 | Viewport( 187 | axisDirection: axisDirection, 188 | anchor: widget.anchor, 189 | offset: offset, 190 | slivers: slivers, 191 | cacheExtent: widget.cacheExtent, 192 | ), 193 | ], 194 | ); 195 | }); 196 | }, 197 | ); 198 | } 199 | 200 | AxisDirection _getDirection(BuildContext context) { 201 | return getAxisDirectionFromAxisReverseAndDirectionality( 202 | context, widget.scrollDirection, widget.reverse); 203 | } 204 | 205 | List _buildSlivers(BuildContext context, {bool negative = false}) { 206 | final itemExtent = widget.itemExtent; 207 | final padding = widget.padding ?? EdgeInsets.zero; 208 | return [ 209 | SliverPadding( 210 | padding: negative 211 | ? padding - EdgeInsets.only(bottom: padding.bottom) 212 | : padding - EdgeInsets.only(top: padding.top), 213 | sliver: (itemExtent != null) 214 | ? SliverFixedExtentList( 215 | delegate: negative ? negativeChildrenDelegate : positiveChildrenDelegate, 216 | itemExtent: itemExtent, 217 | ) 218 | : SliverList( 219 | delegate: negative ? negativeChildrenDelegate : positiveChildrenDelegate, 220 | ), 221 | ) 222 | ]; 223 | } 224 | 225 | SliverChildDelegate get negativeChildrenDelegate { 226 | return SliverChildBuilderDelegate( 227 | (BuildContext context, int index) { 228 | final separatorBuilder = widget.separatorBuilder; 229 | if (separatorBuilder != null) { 230 | final itemIndex = (-1 - index) ~/ 2; 231 | return index.isOdd 232 | ? widget.itemBuilder(context, itemIndex) 233 | : separatorBuilder(context, itemIndex); 234 | } else { 235 | return widget.itemBuilder(context, -1 - index); 236 | } 237 | }, 238 | childCount: widget.itemCount, 239 | addAutomaticKeepAlives: widget.addAutomaticKeepAlives, 240 | addRepaintBoundaries: widget.addRepaintBoundaries, 241 | ); 242 | } 243 | 244 | SliverChildDelegate get positiveChildrenDelegate { 245 | final separatorBuilder = widget.separatorBuilder; 246 | final itemCount = widget.itemCount; 247 | return SliverChildBuilderDelegate( 248 | (separatorBuilder != null) 249 | ? (BuildContext context, int index) { 250 | final itemIndex = index ~/ 2; 251 | return index.isEven 252 | ? widget.itemBuilder(context, itemIndex) 253 | : separatorBuilder(context, itemIndex); 254 | } 255 | : widget.itemBuilder, 256 | childCount: separatorBuilder == null 257 | ? itemCount 258 | : (itemCount != null ? math.max(0, itemCount * 2 - 1) : null), 259 | addAutomaticKeepAlives: widget.addAutomaticKeepAlives, 260 | addRepaintBoundaries: widget.addRepaintBoundaries, 261 | ); 262 | } 263 | 264 | @override 265 | void debugFillProperties(DiagnosticPropertiesBuilder properties) { 266 | super.debugFillProperties(properties); 267 | properties.add(EnumProperty('scrollDirection', widget.scrollDirection)); 268 | properties 269 | .add(FlagProperty('reverse', value: widget.reverse, ifTrue: 'reversed', showName: true)); 270 | properties.add(DiagnosticsProperty('controller', widget.controller, 271 | showName: false, defaultValue: null)); 272 | properties.add(DiagnosticsProperty('physics', widget.physics, 273 | showName: false, defaultValue: null)); 274 | properties.add( 275 | DiagnosticsProperty('padding', widget.padding, defaultValue: null)); 276 | properties.add(DoubleProperty('itemExtent', widget.itemExtent, defaultValue: null)); 277 | properties.add(DoubleProperty('cacheExtent', widget.cacheExtent, defaultValue: null)); 278 | } 279 | } 280 | 281 | /// Same as a [ScrollController] except it provides [ScrollPosition] objects with infinite bounds. 282 | class InfiniteScrollController extends ScrollController { 283 | /// Creates a new [InfiniteScrollController] 284 | InfiniteScrollController({ 285 | double initialScrollOffset = 0.0, 286 | bool keepScrollOffset = true, 287 | String? debugLabel, 288 | }) : super( 289 | initialScrollOffset: initialScrollOffset, 290 | keepScrollOffset: keepScrollOffset, 291 | debugLabel: debugLabel, 292 | ); 293 | 294 | @override 295 | ScrollPosition createScrollPosition( 296 | ScrollPhysics physics, ScrollContext context, ScrollPosition? oldPosition) { 297 | return _InfiniteScrollPosition( 298 | physics: physics, 299 | context: context, 300 | initialPixels: initialScrollOffset, 301 | keepScrollOffset: keepScrollOffset, 302 | oldPosition: oldPosition, 303 | debugLabel: debugLabel, 304 | ); 305 | } 306 | } 307 | 308 | class _InfiniteScrollPosition extends ScrollPositionWithSingleContext { 309 | _InfiniteScrollPosition({ 310 | required ScrollPhysics physics, 311 | required ScrollContext context, 312 | double? initialPixels = 0.0, 313 | bool keepScrollOffset = true, 314 | ScrollPosition? oldPosition, 315 | String? debugLabel, 316 | this.negativeScroll = false, 317 | }) : super( 318 | physics: physics, 319 | context: context, 320 | initialPixels: initialPixels, 321 | keepScrollOffset: keepScrollOffset, 322 | oldPosition: oldPosition, 323 | debugLabel: debugLabel, 324 | ); 325 | 326 | final bool negativeScroll; 327 | 328 | void _forceNegativePixels(double value) { 329 | super.forcePixels(-value); 330 | } 331 | 332 | @override 333 | void saveScrollOffset() { 334 | if (!negativeScroll) { 335 | super.saveScrollOffset(); 336 | } 337 | } 338 | 339 | @override 340 | void restoreScrollOffset() { 341 | if (!negativeScroll) { 342 | super.restoreScrollOffset(); 343 | } 344 | } 345 | 346 | @override 347 | double get minScrollExtent => double.negativeInfinity; 348 | 349 | @override 350 | double get maxScrollExtent => double.infinity; 351 | } 352 | -------------------------------------------------------------------------------- /pubspec.lock: -------------------------------------------------------------------------------- 1 | # Generated by pub 2 | # See https://dart.dev/tools/pub/glossary#lockfile 3 | packages: 4 | async: 5 | dependency: transitive 6 | description: 7 | name: async 8 | url: "https://pub.dartlang.org" 9 | source: hosted 10 | version: "2.5.0" 11 | boolean_selector: 12 | dependency: transitive 13 | description: 14 | name: boolean_selector 15 | url: "https://pub.dartlang.org" 16 | source: hosted 17 | version: "2.1.0" 18 | characters: 19 | dependency: transitive 20 | description: 21 | name: characters 22 | url: "https://pub.dartlang.org" 23 | source: hosted 24 | version: "1.1.0" 25 | charcode: 26 | dependency: transitive 27 | description: 28 | name: charcode 29 | url: "https://pub.dartlang.org" 30 | source: hosted 31 | version: "1.2.0" 32 | clock: 33 | dependency: transitive 34 | description: 35 | name: clock 36 | url: "https://pub.dartlang.org" 37 | source: hosted 38 | version: "1.1.0" 39 | collection: 40 | dependency: transitive 41 | description: 42 | name: collection 43 | url: "https://pub.dartlang.org" 44 | source: hosted 45 | version: "1.15.0" 46 | fake_async: 47 | dependency: transitive 48 | description: 49 | name: fake_async 50 | url: "https://pub.dartlang.org" 51 | source: hosted 52 | version: "1.2.0" 53 | flutter: 54 | dependency: "direct main" 55 | description: flutter 56 | source: sdk 57 | version: "0.0.0" 58 | flutter_test: 59 | dependency: "direct dev" 60 | description: flutter 61 | source: sdk 62 | version: "0.0.0" 63 | matcher: 64 | dependency: transitive 65 | description: 66 | name: matcher 67 | url: "https://pub.dartlang.org" 68 | source: hosted 69 | version: "0.12.10" 70 | meta: 71 | dependency: transitive 72 | description: 73 | name: meta 74 | url: "https://pub.dartlang.org" 75 | source: hosted 76 | version: "1.3.0" 77 | path: 78 | dependency: transitive 79 | description: 80 | name: path 81 | url: "https://pub.dartlang.org" 82 | source: hosted 83 | version: "1.8.0" 84 | sky_engine: 85 | dependency: transitive 86 | description: flutter 87 | source: sdk 88 | version: "0.0.99" 89 | source_span: 90 | dependency: transitive 91 | description: 92 | name: source_span 93 | url: "https://pub.dartlang.org" 94 | source: hosted 95 | version: "1.8.1" 96 | stack_trace: 97 | dependency: transitive 98 | description: 99 | name: stack_trace 100 | url: "https://pub.dartlang.org" 101 | source: hosted 102 | version: "1.10.0" 103 | stream_channel: 104 | dependency: transitive 105 | description: 106 | name: stream_channel 107 | url: "https://pub.dartlang.org" 108 | source: hosted 109 | version: "2.1.0" 110 | string_scanner: 111 | dependency: transitive 112 | description: 113 | name: string_scanner 114 | url: "https://pub.dartlang.org" 115 | source: hosted 116 | version: "1.1.0" 117 | term_glyph: 118 | dependency: transitive 119 | description: 120 | name: term_glyph 121 | url: "https://pub.dartlang.org" 122 | source: hosted 123 | version: "1.2.0" 124 | test_api: 125 | dependency: transitive 126 | description: 127 | name: test_api 128 | url: "https://pub.dartlang.org" 129 | source: hosted 130 | version: "0.2.19" 131 | typed_data: 132 | dependency: transitive 133 | description: 134 | name: typed_data 135 | url: "https://pub.dartlang.org" 136 | source: hosted 137 | version: "1.3.0" 138 | vector_math: 139 | dependency: transitive 140 | description: 141 | name: vector_math 142 | url: "https://pub.dartlang.org" 143 | source: hosted 144 | version: "2.1.0" 145 | sdks: 146 | dart: ">=2.12.0 <3.0.0" 147 | -------------------------------------------------------------------------------- /pubspec.yaml: -------------------------------------------------------------------------------- 1 | name: infinite_listview 2 | description: ListView with items that can be scrolled infinitely in both directions. 3 | version: 1.1.0 4 | homepage: https://github.com/fluttercommunity/flutter_infinite_listview 5 | maintainer: Simon Lightfoot (@slightfoot) 6 | 7 | environment: 8 | sdk: '>=2.12.0 <3.0.0' 9 | 10 | dependencies: 11 | flutter: 12 | sdk: flutter 13 | 14 | dev_dependencies: 15 | flutter_test: 16 | sdk: flutter 17 | --------------------------------------------------------------------------------