├── .gitignore ├── .idea ├── .gitignore ├── codeStyles │ └── Project.xml ├── libraries │ └── Dart_SDK.xml ├── misc.xml ├── modules.xml ├── vcs.xml └── workspace.xml ├── .vscode └── launch.json ├── CHANGELOG.md ├── LICENSE ├── README.md ├── android ├── app │ └── src │ │ └── main │ │ └── java │ │ └── io │ │ └── flutter │ │ └── plugins │ │ └── GeneratedPluginRegistrant.java └── local.properties ├── example ├── .gitignore ├── .metadata ├── README.md ├── android │ ├── app │ │ ├── build.gradle │ │ └── src │ │ │ └── main │ │ │ ├── AndroidManifest.xml │ │ │ ├── java │ │ │ └── com │ │ │ │ └── example │ │ │ │ └── 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.properties │ └── settings.gradle ├── ios │ ├── Flutter │ │ ├── AppFrameworkInfo.plist │ │ ├── Debug.xcconfig │ │ ├── Release.xcconfig │ │ └── flutter_export_environment.sh │ ├── 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 │ ├── horizontal_explicit.dart │ ├── horziontal.dart │ ├── main.dart │ └── vertical.dart └── pubspec.yaml ├── lib ├── size_providers.dart ├── snaplist.dart ├── snaplist_bloc.dart ├── snaplist_controller.dart ├── snaplist_events.dart └── snaplist_view.dart ├── pubspec.lock ├── pubspec.yaml ├── snaplist.iml └── test ├── event_matchers.dart ├── snaplist_controller_test.dart └── snaplist_test.dart /.gitignore: -------------------------------------------------------------------------------- 1 | .DS_Store 2 | .dart_tool/ 3 | 4 | .packages 5 | .pub/ 6 | 7 | build/ 8 | ios/.generated/ 9 | ios/Flutter/Generated.xcconfig 10 | ios/Runner/GeneratedPluginRegistrant.* 11 | -------------------------------------------------------------------------------- /.idea/.gitignore: -------------------------------------------------------------------------------- 1 | 2 | # Project exclude paths 3 | /. 4 | # Project exclude paths 5 | /. 6 | # Project exclude paths 7 | /. 8 | # Project exclude paths 9 | /. 10 | # Project exclude paths 11 | /. -------------------------------------------------------------------------------- /.idea/codeStyles/Project.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 7 | 8 | 9 |
10 | 11 | 12 | 13 | xmlns:android 14 | 15 | ^$ 16 | 17 | 18 | 19 |
20 |
21 | 22 | 23 | 24 | xmlns:.* 25 | 26 | ^$ 27 | 28 | 29 | BY_NAME 30 | 31 |
32 |
33 | 34 | 35 | 36 | .*:id 37 | 38 | http://schemas.android.com/apk/res/android 39 | 40 | 41 | 42 |
43 |
44 | 45 | 46 | 47 | .*:name 48 | 49 | http://schemas.android.com/apk/res/android 50 | 51 | 52 | 53 |
54 |
55 | 56 | 57 | 58 | name 59 | 60 | ^$ 61 | 62 | 63 | 64 |
65 |
66 | 67 | 68 | 69 | style 70 | 71 | ^$ 72 | 73 | 74 | 75 |
76 |
77 | 78 | 79 | 80 | .* 81 | 82 | ^$ 83 | 84 | 85 | BY_NAME 86 | 87 |
88 |
89 | 90 | 91 | 92 | .* 93 | 94 | http://schemas.android.com/apk/res/android 95 | 96 | 97 | ANDROID_ATTRIBUTE_ORDER 98 | 99 |
100 |
101 | 102 | 103 | 104 | .* 105 | 106 | .* 107 | 108 | 109 | BY_NAME 110 | 111 |
112 | 113 | 114 | 115 | 116 | -------------------------------------------------------------------------------- /.idea/libraries/Dart_SDK.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | -------------------------------------------------------------------------------- /.idea/misc.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | -------------------------------------------------------------------------------- /.idea/modules.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /.idea/vcs.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | -------------------------------------------------------------------------------- /.idea/workspace.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 18 | 19 | 20 | 22 | 23 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 50 | 51 | 52 | 53 | 54 | 103 | 104 | 105 | 106 | 107 | 108 | 109 | 110 | 1589303960013 111 | 115 | 116 | 117 | 118 | 129 | 130 | -------------------------------------------------------------------------------- /.vscode/launch.json: -------------------------------------------------------------------------------- 1 | { 2 | // Use IntelliSense to learn about possible attributes. 3 | // Hover to view descriptions of existing attributes. 4 | // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387 5 | "version": "0.2.0", 6 | "configurations": [ 7 | { 8 | "name": "Flutter", 9 | "request": "launch", 10 | "type": "dart", 11 | "program": "example/lib/main.dart" 12 | } 13 | ] 14 | } -------------------------------------------------------------------------------- /CHANGELOG.md: -------------------------------------------------------------------------------- 1 | # Changelog 2 | 3 | ## [0.1.8] - 16.03.2019 4 | 5 | * Introducing `SnaplistController` to allow initial item position and setting position programatically. 6 | 7 | ## [0.1.7] - 01.02.2019 8 | 9 | * Hot reload did nothing to snaplist. Now it is fixed. A big thanks to [@raacker](https://github.com/raacker). 10 | 11 | ## [0.1.6] - 31.10.2018 12 | 13 | * Hot reload did nothing to snaplist. Now it is fixed. A big thanks to [@raacker](https://github.com/raacker). 14 | 15 | ## [0.1.5] - 28.10.2018 16 | 17 | * Implements vertical axis scroll and snip. A big thanks to [@raacker](https://github.com/raacker). 18 | 19 | ## [0.1.4] - 27.10.2018 20 | 21 | * Adds a simple example to the package 22 | 23 | ## [0.1.3] - 26.10.2018 24 | 25 | * Readme and organizational updates. 26 | 27 | ## [0.1.2] - 25.10.2018 28 | 29 | * Implements snapping back to original item if not enough velocity or progress 30 | 31 | ## [0.1.1] - 24.10.2018 32 | 33 | * Explicitly provides current item position, does not hide it in builder data 34 | * Removes unnessesary `setState` calls from snip animation 35 | 36 | ## [0.1.0] - 21.10.2018 37 | 38 | * It's alive! 39 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Copyright (c) 2018 David Leibovych 2 | 3 | Permission is hereby granted, free of charge, to any person obtaining a copy 4 | of this software and associated documentation files (the "Software"), to deal 5 | in the Software without restriction, including without limitation the rights 6 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 7 | copies of the Software, and to permit persons to whom the Software is 8 | furnished to do so, subject to the following conditions: 9 | 10 | The above copyright notice and this permission notice shall be included in all 11 | copies or substantial portions of the Software. 12 | 13 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 14 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 15 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 16 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 17 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 18 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 19 | SOFTWARE. -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | [![awesome flutter](https://img.shields.io/badge/Awesome-Flutter-blue.svg?longCache=true&style=flat-square)](https://stackoverflow.com/questions/tagged/flutter?sort=votes) 2 | [![pub package](https://img.shields.io/pub/v/snaplist.svg)](https://pub.dartlang.org/packages/snaplist) 3 | 4 | # snaplist 5 | 6 | A small cozy library that allows you to make snappable list views. 7 | 8 | **Issues and Pull Requests are really appreciated!** 9 | 10 | Snaplist supports different and even dynamically sized children to be listed and correctly snapped. 11 | 12 | ## Showcase 13 | 14 | ![Showscase gif](https://media.giphy.com/media/27bTHalyweVoc2psS2/giphy.gif) 15 | 16 | ## Include to your project 17 | 18 | In your `pubspec.yaml` root add: 19 | 20 | ```yaml 21 | dependencies: 22 | snaplist: ^0.1.8 23 | ``` 24 | 25 | ## Include 26 | 27 | The library does provide `StatefulWidget` which is called `SnapList`. 28 | 29 | Include the widget like this: 30 | `import 'package:snaplist/snaplist.dart';` 31 | 32 | ## Usage 33 | 34 | Use it as you'd use any widget: 35 | 36 | ```dart 37 | Widget build(BuildContext context) { 38 | return SnapList( 39 | sizeProvider: (index, data) => Size(100.0, 100.0), 40 | separatorProvider: (index, data) => Size(10.0, 10.0), 41 | builder: (context, index, data) => SizedBox(), 42 | count: 1, 43 | ); 44 | } 45 | ``` 46 | 47 | Snaplist uses gesture detection for swiping the list, so, please, be sure that the gestures you apply to the widgets inside are not overlapping for best user experience. 48 | 49 | ## Properties 50 | 51 | There are 4 required fields: 52 | 53 | - `sizeProvider` is a provider of each widget size. The library will wrap each built widget to a sized box of specified size. This is required so snapping calculations will work correctly. 54 | - `separatorProvider` is similar to `sizeProvider`, but this size will be used to build the list separators. 55 | - `builder` works like a regular `Flutter` builder all of us are familiar with. It will pass you the context, current item index and some additional data. 56 | - `count` - Children count as in a `ListView`. 57 | 58 | The `data` which is provided to each provider and the builder is a combination of three fields: 59 | 60 | - `center` - is the position which is now displayed and referenced as the center widget. 61 | - `next` - is the position which the user is scrolling to. It is `-1` if idle. 62 | - `progress` - is the scroll and snip progress. The values are from `0` to `100`. 63 | 64 | Snaplist defaults to horizontal scrolling. You can set `axis` to Axis.vertical for vertical scrolling. 65 | -------------------------------------------------------------------------------- /android/app/src/main/java/io/flutter/plugins/GeneratedPluginRegistrant.java: -------------------------------------------------------------------------------- 1 | package io.flutter.plugins; 2 | 3 | import io.flutter.plugin.common.PluginRegistry; 4 | 5 | /** 6 | * Generated file. Do not edit. 7 | */ 8 | public final class GeneratedPluginRegistrant { 9 | public static void registerWith(PluginRegistry registry) { 10 | if (alreadyRegisteredWith(registry)) { 11 | return; 12 | } 13 | } 14 | 15 | private static boolean alreadyRegisteredWith(PluginRegistry registry) { 16 | final String key = GeneratedPluginRegistrant.class.getCanonicalName(); 17 | if (registry.hasPlugin(key)) { 18 | return true; 19 | } 20 | registry.registrarFor(key); 21 | return false; 22 | } 23 | } 24 | -------------------------------------------------------------------------------- /android/local.properties: -------------------------------------------------------------------------------- 1 | sdk.dir=/Users/david/Library/Android/sdk 2 | flutter.sdk=/Users/david/Tools/flutter 3 | flutter.versionName=0.1.3 -------------------------------------------------------------------------------- /example/.gitignore: -------------------------------------------------------------------------------- 1 | # Miscellaneous 2 | *.class 3 | *.lock 4 | *.log 5 | *.pyc 6 | *.swp 7 | .DS_Store 8 | .atom/ 9 | .buildlog/ 10 | .history 11 | .svn/ 12 | 13 | # IntelliJ related 14 | *.iml 15 | *.ipr 16 | *.iws 17 | .idea/ 18 | 19 | # Visual Studio Code related 20 | .vscode/ 21 | 22 | # Flutter/Dart/Pub related 23 | **/doc/api/ 24 | .dart_tool/ 25 | .flutter-plugins 26 | .packages 27 | .pub-cache/ 28 | .pub/ 29 | build/ 30 | 31 | # Android related 32 | **/android/**/gradle-wrapper.jar 33 | **/android/.gradle 34 | **/android/captures/ 35 | **/android/gradlew 36 | **/android/gradlew.bat 37 | **/android/local.properties 38 | **/android/**/GeneratedPluginRegistrant.java 39 | 40 | # iOS/XCode related 41 | **/ios/**/*.mode1v3 42 | **/ios/**/*.mode2v3 43 | **/ios/**/*.moved-aside 44 | **/ios/**/*.pbxuser 45 | **/ios/**/*.perspectivev3 46 | **/ios/**/*sync/ 47 | **/ios/**/.sconsign.dblite 48 | **/ios/**/.tags* 49 | **/ios/**/.vagrant/ 50 | **/ios/**/DerivedData/ 51 | **/ios/**/Icon? 52 | **/ios/**/Pods/ 53 | **/ios/**/.symlinks/ 54 | **/ios/**/profile 55 | **/ios/**/xcuserdata 56 | **/ios/.generated/ 57 | **/ios/Flutter/App.framework 58 | **/ios/Flutter/Flutter.framework 59 | **/ios/Flutter/Generated.xcconfig 60 | **/ios/Flutter/app.flx 61 | **/ios/Flutter/app.zip 62 | **/ios/Flutter/flutter_assets/ 63 | **/ios/ServiceDefinitions.json 64 | **/ios/Runner/GeneratedPluginRegistrant.* 65 | 66 | # Exceptions to above rules. 67 | !**/ios/**/default.mode1v3 68 | !**/ios/**/default.mode2v3 69 | !**/ios/**/default.pbxuser 70 | !**/ios/**/default.perspectivev3 71 | !/packages/flutter_tools/test/data/dart_dependencies_test/**/.packages 72 | -------------------------------------------------------------------------------- /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: f37c235c32fc15babe6dc7b7bc2ee4387e5ecf92 8 | channel: beta 9 | -------------------------------------------------------------------------------- /example/README.md: -------------------------------------------------------------------------------- 1 | # example 2 | 3 | Sample app for the Snaplist library. 4 | 5 | ![showcase](https://media.giphy.com/media/1mhjknie03qNzTKri0/giphy.gif). 6 | 7 | This application shows two uses case of using snaplist - vertical and horizontal snapping. 8 | 9 | The only actual difference between those two is the `axis` value. But I still believe it is important considering both options, especially if you are providing some additional gestures to the displayed item. 10 | 11 | Please, be sure that your gesture does not conflict with the gesture which is used for the list scroll and snaps. -------------------------------------------------------------------------------- /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 from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle" 26 | 27 | android { 28 | compileSdkVersion 29 29 | 30 | lintOptions { 31 | disable 'InvalidPackage' 32 | } 33 | 34 | defaultConfig { 35 | // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html). 36 | applicationId "com.example.example" 37 | minSdkVersion 16 38 | targetSdkVersion 29 39 | versionCode flutterVersionCode.toInteger() 40 | versionName flutterVersionName 41 | testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" 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 | testImplementation 'junit:junit:4.12' 59 | androidTestImplementation 'com.android.support.test:runner:1.0.2' 60 | androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2' 61 | } 62 | -------------------------------------------------------------------------------- /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/example/example/MainActivity.java: -------------------------------------------------------------------------------- 1 | package com.example.example; 2 | 3 | import android.os.Bundle; 4 | import io.flutter.app.FlutterActivity; 5 | import io.flutter.plugins.GeneratedPluginRegistrant; 6 | 7 | public class MainActivity extends FlutterActivity { 8 | @Override 9 | protected void onCreate(Bundle savedInstanceState) { 10 | super.onCreate(savedInstanceState); 11 | GeneratedPluginRegistrant.registerWith(this); 12 | } 13 | } 14 | -------------------------------------------------------------------------------- /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/ariedov/flutter_snaplist/ae735207d8dc93658843cc801bf3965b2320359b/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/ariedov/flutter_snaplist/ae735207d8dc93658843cc801bf3965b2320359b/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/ariedov/flutter_snaplist/ae735207d8dc93658843cc801bf3965b2320359b/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/ariedov/flutter_snaplist/ae735207d8dc93658843cc801bf3965b2320359b/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/ariedov/flutter_snaplist/ae735207d8dc93658843cc801bf3965b2320359b/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:3.6.3' 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}/${project.name}" 22 | } 23 | subprojects { 24 | project.evaluationDependsOn(':app') 25 | } 26 | 27 | task clean(type: Delete) { 28 | delete rootProject.buildDir 29 | } 30 | -------------------------------------------------------------------------------- /example/android/gradle.properties: -------------------------------------------------------------------------------- 1 | org.gradle.jvmargs=-Xmx1536M 2 | android.enableR8=true 3 | android.useAndroidX=true 4 | -------------------------------------------------------------------------------- /example/android/gradle/wrapper/gradle-wrapper.properties: -------------------------------------------------------------------------------- 1 | #Fri Jun 23 08:50:38 CEST 2017 2 | distributionBase=GRADLE_USER_HOME 3 | distributionPath=wrapper/dists 4 | zipStoreBase=GRADLE_USER_HOME 5 | zipStorePath=wrapper/dists 6 | distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.4-all.zip 7 | -------------------------------------------------------------------------------- /example/android/settings.gradle: -------------------------------------------------------------------------------- 1 | include ':app' 2 | 3 | def flutterProjectRoot = rootProject.projectDir.parentFile.toPath() 4 | 5 | def plugins = new Properties() 6 | def pluginsFile = new File(flutterProjectRoot.toFile(), '.flutter-plugins') 7 | if (pluginsFile.exists()) { 8 | pluginsFile.withReader('UTF-8') { reader -> plugins.load(reader) } 9 | } 10 | 11 | plugins.each { name, path -> 12 | def pluginDirectory = flutterProjectRoot.resolve(path).resolve('android').toFile() 13 | include ":$name" 14 | project(":$name").projectDir = pluginDirectory 15 | } 16 | -------------------------------------------------------------------------------- /example/ios/Flutter/AppFrameworkInfo.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | CFBundleDevelopmentRegion 6 | en 7 | CFBundleExecutable 8 | App 9 | CFBundleIdentifier 10 | io.flutter.flutter.app 11 | CFBundleInfoDictionaryVersion 12 | 6.0 13 | CFBundleName 14 | App 15 | CFBundlePackageType 16 | FMWK 17 | CFBundleShortVersionString 18 | 1.0 19 | CFBundleSignature 20 | ???? 21 | CFBundleVersion 22 | 1.0 23 | MinimumOSVersion 24 | 8.0 25 | 26 | 27 | -------------------------------------------------------------------------------- /example/ios/Flutter/Debug.xcconfig: -------------------------------------------------------------------------------- 1 | #include "Generated.xcconfig" 2 | -------------------------------------------------------------------------------- /example/ios/Flutter/Release.xcconfig: -------------------------------------------------------------------------------- 1 | #include "Generated.xcconfig" 2 | -------------------------------------------------------------------------------- /example/ios/Flutter/flutter_export_environment.sh: -------------------------------------------------------------------------------- 1 | #!/bin/sh 2 | # This is a generated file; do not edit or check into version control. 3 | export "FLUTTER_ROOT=C:\Users\aried\Tools\flutter" 4 | export "FLUTTER_APPLICATION_PATH=C:\Users\aried\Projects\flutter_snaplist\example" 5 | export "FLUTTER_TARGET=lib\main.dart" 6 | export "FLUTTER_BUILD_DIR=build" 7 | export "SYMROOT=${SOURCE_ROOT}/../build\ios" 8 | export "OTHER_LDFLAGS=$(inherited) -framework Flutter" 9 | export "FLUTTER_FRAMEWORK_DIR=C:\Users\aried\Tools\flutter\bin\cache\artifacts\engine\ios" 10 | export "FLUTTER_BUILD_NAME=1.0.0" 11 | export "FLUTTER_BUILD_NUMBER=1" 12 | -------------------------------------------------------------------------------- /example/ios/Runner.xcodeproj/project.pbxproj: -------------------------------------------------------------------------------- 1 | // !$*UTF8*$! 2 | { 3 | archiveVersion = 1; 4 | classes = { 5 | }; 6 | objectVersion = 46; 7 | objects = { 8 | 9 | /* Begin PBXBuildFile section */ 10 | 1498D2341E8E89220040F4C2 /* GeneratedPluginRegistrant.m in Sources */ = {isa = PBXBuildFile; fileRef = 1498D2331E8E89220040F4C2 /* GeneratedPluginRegistrant.m */; }; 11 | 2D5378261FAA1A9400D5DBA9 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-------------------------------------------------------------------------------- /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 7 | didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { 8 | [GeneratedPluginRegistrant registerWithRegistry:self]; 9 | // Override point for customization after application launch. 10 | return [super application:application didFinishLaunchingWithOptions:launchOptions]; 11 | } 12 | 13 | @end 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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| 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 | $(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/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/horizontal_explicit.dart: -------------------------------------------------------------------------------- 1 | import 'dart:math'; 2 | 3 | import 'package:flutter/material.dart'; 4 | import 'package:snaplist/snaplist.dart'; 5 | 6 | class HorizontalExplicitTab extends StatelessWidget { 7 | final List images; 8 | final VoidCallback loadMore; 9 | 10 | const HorizontalExplicitTab({Key key, this.images, this.loadMore}) 11 | : super(key: key); 12 | 13 | @override 14 | Widget build(BuildContext context) { 15 | final Size cardSize = Size(300.0, 460.0); 16 | 17 | final random = new Random(); 18 | final controller = SnaplistController(initialPosition: 2); 19 | return Stack( 20 | children: [ 21 | SnapList( 22 | padding: EdgeInsets.only( 23 | left: (MediaQuery.of(context).size.width - cardSize.width) / 2), 24 | sizeProvider: (index, data) => cardSize, 25 | separatorProvider: (index, data) => Size(10.0, 10.0), 26 | positionUpdate: (int index) { 27 | if (index == images.length - 1) { 28 | loadMore(); 29 | } 30 | }, 31 | builder: (context, index, data) { 32 | return ClipRRect( 33 | borderRadius: new BorderRadius.circular(16.0), 34 | child: Image.network( 35 | images[index], 36 | fit: BoxFit.fill, 37 | ), 38 | ); 39 | }, 40 | count: images.length, 41 | snaplistController: controller, 42 | ), 43 | Positioned( 44 | child: FloatingActionButton( 45 | onPressed: () => 46 | controller.setPosition(random.nextInt(images.length)), 47 | ), 48 | bottom: 10, 49 | right: 10, 50 | ) 51 | ], 52 | ); 53 | } 54 | } 55 | -------------------------------------------------------------------------------- /example/lib/horziontal.dart: -------------------------------------------------------------------------------- 1 | import 'package:flutter/material.dart'; 2 | import 'package:snaplist/snaplist.dart'; 3 | 4 | class HorizontalTab extends StatelessWidget { 5 | final List images; 6 | final VoidCallback loadMore; 7 | 8 | const HorizontalTab({Key key, this.images, this.loadMore}) : super(key: key); 9 | 10 | @override 11 | Widget build(BuildContext context) { 12 | final Size cardSize = Size(300.0, 460.0); 13 | return SnapList( 14 | padding: EdgeInsets.only( 15 | left: (MediaQuery.of(context).size.width - cardSize.width) / 2), 16 | sizeProvider: (index, data) => cardSize, 17 | separatorProvider: (index, data) => Size(10.0, 10.0), 18 | positionUpdate: (int index) { 19 | if (index == images.length - 1) { 20 | loadMore(); 21 | } 22 | }, 23 | builder: (context, index, data) { 24 | return ClipRRect( 25 | borderRadius: new BorderRadius.circular(16.0), 26 | child: Image.network( 27 | images[index], 28 | fit: BoxFit.fill, 29 | ), 30 | ); 31 | }, 32 | count: images.length, 33 | ); 34 | } 35 | } 36 | -------------------------------------------------------------------------------- /example/lib/main.dart: -------------------------------------------------------------------------------- 1 | import 'package:example/horizontal_explicit.dart'; 2 | import 'package:example/horziontal.dart'; 3 | import 'package:example/vertical.dart'; 4 | import 'package:flutter/material.dart'; 5 | 6 | void main() => runApp(new MyApp()); 7 | 8 | class MyApp extends StatelessWidget { 9 | @override 10 | Widget build(BuildContext context) { 11 | return new MaterialApp( 12 | title: 'Snaplist Demo', 13 | theme: new ThemeData( 14 | primarySwatch: Colors.blue, 15 | ), 16 | home: new MyHomePage(), 17 | ); 18 | } 19 | } 20 | 21 | class MyHomePage extends StatefulWidget { 22 | @override 23 | _MyHomePageState createState() => new _MyHomePageState(); 24 | } 25 | 26 | class _MyHomePageState extends State { 27 | List urls = [ 28 | "https://image.tmdb.org/t/p/w370_and_h556_bestv2/2uNW4WbgBXL25BAbXGLnLqX71Sw.jpg", 29 | "https://image.tmdb.org/t/p/w370_and_h556_bestv2/lNkDYKmrVem1J0aAfCnQlJOCKnT.jpg", 30 | "https://image.tmdb.org/t/p/w370_and_h556_bestv2/wrFpXMNBRj2PBiN4Z5kix51XaIZ.jpg", 31 | "https://image.tmdb.org/t/p/w370_and_h556_bestv2/r6pPUVUKU5eIpYj4oEzidk5ZibB.jpg", 32 | "https://image.tmdb.org/t/p/w370_and_h556_bestv2/x1txcDXkcM65gl7w20PwYSxAYah.jpg", 33 | "https://image.tmdb.org/t/p/w370_and_h556_bestv2/ptSrT1JwZFWGhjSpYUtJaasQrh.jpg", 34 | "https://image.tmdb.org/t/p/w370_and_h556_bestv2/wMq9kQXTeQCHUZOG4fAe5cAxyUA.jpg", 35 | "https://image.tmdb.org/t/p/w370_and_h556_bestv2/7WsyChQLEftFiDOVTGkv3hFpyyt.jpg", 36 | ]; 37 | 38 | @override 39 | Widget build(BuildContext context) { 40 | return DefaultTabController( 41 | child: Scaffold( 42 | appBar: AppBar( 43 | title: Text("Snaplist demo"), 44 | bottom: TabBar(tabs: [ 45 | Tab( 46 | text: "Horizontal", 47 | ), 48 | Tab( 49 | text: "Explicit", 50 | ), 51 | Tab(text: "Vertical") 52 | ])), 53 | body: TabBarView( 54 | physics: NeverScrollableScrollPhysics(), 55 | children: [ HorizontalTab( 56 | images: urls, loadMore: _loadMoreItems, 57 | ), 58 | HorizontalExplicitTab( 59 | images: urls, loadMore: _loadMoreItems, 60 | ), 61 | VerticalTab(images: urls, loadMore: _loadMoreItems) 62 | ], 63 | ), 64 | ), 65 | length: 3 66 | ); 67 | } 68 | 69 | void _loadMoreItems() { 70 | setState(() { 71 | urls = new List.from(urls)..addAll(urls); 72 | }); 73 | } 74 | } 75 | -------------------------------------------------------------------------------- /example/lib/vertical.dart: -------------------------------------------------------------------------------- 1 | import 'package:flutter/material.dart'; 2 | import 'package:snaplist/snaplist.dart'; 3 | 4 | class VerticalTab extends StatelessWidget { 5 | final List images; 6 | final VoidCallback loadMore; 7 | 8 | const VerticalTab({Key key, this.images, this.loadMore}) : super(key: key); 9 | 10 | @override 11 | Widget build(BuildContext context) { 12 | final Size cardSize = Size(250.0, 250.0); 13 | return SnapList( 14 | padding: EdgeInsets.only( 15 | top: (MediaQuery.of(context).size.height - 180 - cardSize.height) / 2), 16 | sizeProvider: (index, data) => cardSize, 17 | separatorProvider: (index, data) => Size(50.0, 50.0), 18 | positionUpdate: (int index){ 19 | if(index==images.length-1){ 20 | loadMore(); 21 | } 22 | }, 23 | builder: (context, index, data) { 24 | return ClipOval( 25 | child: Image.network( 26 | images[index], 27 | fit: BoxFit.cover, 28 | ), 29 | ); 30 | }, 31 | count: images.length, 32 | axis: Axis.vertical, 33 | ); 34 | } 35 | } 36 | -------------------------------------------------------------------------------- /example/pubspec.yaml: -------------------------------------------------------------------------------- 1 | name: example 2 | description: A demo showcase of snaplist library. 3 | 4 | version: 1.0.0+1 5 | 6 | environment: 7 | sdk: ">=2.0.0-dev.68.0 <3.0.0" 8 | 9 | dependencies: 10 | flutter: 11 | sdk: flutter 12 | snaplist: 13 | path: ../ 14 | 15 | dev_dependencies: 16 | flutter_test: 17 | sdk: flutter 18 | 19 | flutter: 20 | uses-material-design: true 21 | -------------------------------------------------------------------------------- /lib/size_providers.dart: -------------------------------------------------------------------------------- 1 | import 'package:flutter/widgets.dart'; 2 | 3 | typedef Size CardSizeProvider(int position, BuilderData data); 4 | typedef Size SeparatorSizeProvider(int position, BuilderData data); 5 | 6 | class BuilderData { 7 | final int center; 8 | final int next; 9 | final double progress; 10 | 11 | BuilderData(this.center, this.next, this.progress); 12 | } 13 | -------------------------------------------------------------------------------- /lib/snaplist.dart: -------------------------------------------------------------------------------- 1 | library snaplist; 2 | 3 | export 'snaplist_view.dart'; 4 | export 'snaplist_controller.dart'; -------------------------------------------------------------------------------- /lib/snaplist_bloc.dart: -------------------------------------------------------------------------------- 1 | import 'dart:async'; 2 | 3 | import 'package:flutter/widgets.dart'; 4 | import 'package:snaplist/size_providers.dart'; 5 | import 'package:snaplist/snaplist_events.dart'; 6 | 7 | class SnapListBloc { 8 | int _itemsCount; 9 | CardSizeProvider _sizeProvider; 10 | SeparatorSizeProvider _separatorProvider; 11 | double _swipeVelocity; 12 | Axis _axis; 13 | 14 | int _centerItemPosition = 0; 15 | int _nextItemPosition = -1; 16 | 17 | double _scrollOffset; 18 | double _startPosition; 19 | 20 | double _scrollProgress; 21 | 22 | ScrollDirection _direction = ScrollDirection.NONE; 23 | bool get _isVertical => _axis == Axis.vertical; 24 | 25 | StreamController _swipeStartController = StreamController(); 26 | Sink get swipeStartSink => _swipeStartController.sink; 27 | 28 | StreamController _swipeUpdateController = StreamController(); 29 | Sink get swipeUpdateSink => _swipeUpdateController.sink; 30 | 31 | StreamController _swipeEndController = StreamController(); 32 | Sink get swipeEndSink => _swipeEndController.sink; 33 | 34 | StreamController _snipStartController = StreamController(); 35 | Stream get snipStartStream => _snipStartController.stream; 36 | 37 | StreamController _snipUpdateController = StreamController(); 38 | Sink get snipUpdateSink => _snipUpdateController.sink; 39 | 40 | StreamController _snipFinishController = StreamController(); 41 | Sink get snipFinishSink => _snipFinishController.sink; 42 | 43 | StreamController _positionChangeController = 44 | StreamController(); 45 | Stream get positionStream => 46 | _positionChangeController.stream; 47 | 48 | StreamController _explicitPositionChangeController = StreamController(); 49 | Sink get explicitPositionChangeSink => 50 | _explicitPositionChangeController.sink; 51 | 52 | StreamController _explicitPositionChangeStream = StreamController(); 53 | Stream get explicitPositionChangeStream => 54 | _explicitPositionChangeStream.stream; 55 | 56 | StreamController _offsetController = StreamController(); 57 | Stream get offsetStream => _offsetController.stream; 58 | 59 | StreamController _itemCountController = StreamController(); 60 | Sink get itemCountSink => _itemCountController.sink; 61 | 62 | StreamController _uiController = StreamController(); 63 | Stream get uiStream => _uiController.stream; 64 | 65 | SnapListBloc( 66 | {int itemsCount, sizeProvider, separatorProvider, axis, swipeVelocity}) { 67 | initializeField( 68 | itemsCount: itemsCount, 69 | sizeProvider: sizeProvider, 70 | axis: axis, 71 | separatorProvider: separatorProvider, 72 | swipeVelocity: swipeVelocity, 73 | ); 74 | 75 | _swipeStartController.stream.listen((event) { 76 | _direction = ScrollDirection.NONE; 77 | 78 | _scrollOffset = event.offset; 79 | _startPosition = event.position; 80 | 81 | _scrollProgress = 0.0; 82 | }); 83 | 84 | _swipeUpdateController.stream.listen((event) { 85 | if (event.position < _startPosition) { 86 | _direction = _isVertical ? ScrollDirection.DOWN : ScrollDirection.RIGHT; 87 | _nextItemPosition = _centerItemPosition + 1; 88 | } else { 89 | _direction = _isVertical ? ScrollDirection.UP : ScrollDirection.LEFT; 90 | _nextItemPosition = _centerItemPosition - 1; 91 | } 92 | 93 | if (_nextItemPosition < 0 || _nextItemPosition >= _itemsCount) { 94 | return; 95 | } 96 | 97 | _scrollOffset = _scrollOffset - event.delta; 98 | _scrollProgress = _calculateScrollProgress(event.position); 99 | _offsetController.add(OffsetEvent(_scrollOffset, _scrollProgress, 100 | _centerItemPosition, _nextItemPosition)); 101 | 102 | _uiController.add( 103 | UiEvent(_centerItemPosition, _nextItemPosition, _scrollProgress)); 104 | }); 105 | 106 | _swipeEndController.stream.listen((event) { 107 | if (_swipeVelocity != 0.0 && 108 | _swipeVelocity >= 109 | (_isVertical ? event.vector.dy.abs() : event.vector.dx.abs()) && 110 | _scrollProgress < 50) { 111 | _scrollProgress = 100 - _scrollProgress; 112 | _swipeNextAndCenter(); 113 | _direction = ScrollDirection.NONE; 114 | } 115 | 116 | if (_direction != null && 117 | _nextItemPosition >= 0 && 118 | _nextItemPosition < _itemsCount) { 119 | _snipStartController.add(SnipStartEvent( 120 | _scrollOffset, _calculateTargetOffset(), _scrollProgress)); 121 | } 122 | }); 123 | 124 | _snipUpdateController.stream.listen((event) { 125 | _scrollProgress = event.progress; 126 | _scrollOffset = event.snip; 127 | 128 | _offsetController.add(OffsetEvent(_scrollOffset, _scrollProgress, 129 | _centerItemPosition, _nextItemPosition)); 130 | _uiController.add( 131 | UiEvent(_centerItemPosition, _nextItemPosition, _scrollProgress)); 132 | }); 133 | 134 | _snipFinishController.stream.listen((event) { 135 | _centerItemPosition = _nextItemPosition.clamp(0, _itemsCount - 1); 136 | _nextItemPosition = -1; 137 | _scrollProgress = 0.0; 138 | 139 | _positionChangeController.add(PositionChangeEvent(_centerItemPosition)); 140 | }); 141 | 142 | _explicitPositionChangeController.stream.listen((position) { 143 | _nextItemPosition = position.clamp(0, _itemsCount - 1); 144 | _scrollProgress = 0.0; 145 | 146 | _explicitPositionChangeStream.add(_calculateTargetOffset()); 147 | 148 | _centerItemPosition = _nextItemPosition; 149 | _nextItemPosition = -1; 150 | }); 151 | 152 | _itemCountController.stream.listen((itemCount) { 153 | _itemsCount = itemCount; 154 | 155 | if (_centerItemPosition >= _itemsCount - 1) { 156 | _centerItemPosition = _itemsCount - 1; 157 | _positionChangeController.add(PositionChangeEvent(_centerItemPosition)); 158 | } 159 | }); 160 | } 161 | 162 | initializeField( 163 | {itemsCount, sizeProvider, separatorProvider, axis, swipeVelocity}) { 164 | _itemsCount = itemsCount ?? 0; 165 | _sizeProvider = sizeProvider; 166 | _separatorProvider = separatorProvider; 167 | _axis = axis; 168 | _swipeVelocity = swipeVelocity; 169 | } 170 | 171 | _swipeNextAndCenter() { 172 | final tmp = _centerItemPosition; 173 | _centerItemPosition = _nextItemPosition; 174 | _nextItemPosition = tmp; 175 | } 176 | 177 | _calculateScrollProgress(double currentPosition) { 178 | final distance = (_startPosition - currentPosition).abs(); 179 | Size cardSize = _sizeProvider(_centerItemPosition, _createBuilderData()); 180 | return ((distance * 100) / (_isVertical ? cardSize.height : cardSize.width)) 181 | .clamp(0.0, 100.0); 182 | } 183 | 184 | double _calculateTargetOffset() { 185 | return calculateTargetOffset( 186 | _centerItemPosition, _nextItemPosition, _isVertical, _sizeProvider, _separatorProvider, _createBuilderData()); 187 | } 188 | 189 | _createBuilderData() { 190 | return BuilderData(_centerItemPosition, _nextItemPosition, _scrollProgress); 191 | } 192 | 193 | void onSwipingFinished() { 194 | _centerItemPosition = _nextItemPosition; 195 | _nextItemPosition = -1; 196 | } 197 | 198 | void dispose() { 199 | _itemCountController.close(); 200 | 201 | _swipeStartController.close(); 202 | _swipeUpdateController.close(); 203 | _swipeEndController.close(); 204 | 205 | _snipStartController.close(); 206 | _snipUpdateController.close(); 207 | _snipFinishController.close(); 208 | 209 | _positionChangeController.close(); 210 | _offsetController.close(); 211 | 212 | _explicitPositionChangeController.close(); 213 | _explicitPositionChangeStream.close(); 214 | 215 | _uiController.close(); 216 | } 217 | } 218 | 219 | double calculateTargetOffset( 220 | int currentItem, 221 | int calculateTo, 222 | bool isVertical, 223 | CardSizeProvider sizeProvider, 224 | SeparatorSizeProvider separatorSizeProvider, 225 | BuilderData builderData) { 226 | double result = 0.0; 227 | 228 | for (var i = 1; i <= calculateTo; ++i) { 229 | Size cardSize = sizeProvider( 230 | i - 1, 231 | BuilderData( 232 | currentItem, 233 | calculateTo, 234 | 100.0, 235 | )); 236 | Size separatorSize = separatorSizeProvider(i - 1, builderData); 237 | 238 | if (isVertical) { 239 | result += cardSize.height; 240 | result += separatorSize.height; 241 | } else { 242 | result += cardSize.width; 243 | result += separatorSize.width; 244 | } 245 | } 246 | return result; 247 | } 248 | 249 | enum ScrollDirection { RIGHT, NONE, LEFT, UP, DOWN } 250 | -------------------------------------------------------------------------------- /lib/snaplist_controller.dart: -------------------------------------------------------------------------------- 1 | class SnaplistController { 2 | 3 | final int initialPosition; 4 | 5 | PositionChanged positionChanged; 6 | 7 | SnaplistController({ 8 | this.initialPosition 9 | }); 10 | 11 | setPosition(int position) { 12 | if (positionChanged != null) { 13 | positionChanged(position); 14 | } 15 | } 16 | } 17 | 18 | typedef PositionChanged(int position); -------------------------------------------------------------------------------- /lib/snaplist_events.dart: -------------------------------------------------------------------------------- 1 | 2 | import 'dart:ui'; 3 | 4 | class StartEvent { 5 | final double offset; 6 | final double position; 7 | 8 | StartEvent(this.offset, this.position); 9 | } 10 | class UpdateEvent { 11 | final double position; 12 | final double delta; 13 | 14 | UpdateEvent(this.position, this.delta); 15 | } 16 | class EndEvent { 17 | final Offset vector; 18 | 19 | EndEvent(this.vector); 20 | } 21 | 22 | class SnipStartEvent { 23 | final double offset; 24 | final double targetOffset; 25 | final double progress; 26 | 27 | SnipStartEvent(this.offset, this.targetOffset, this.progress); 28 | } 29 | class SnipUpdateEvent { 30 | final double snip; 31 | final double progress; 32 | 33 | SnipUpdateEvent(this.snip, this.progress); 34 | } 35 | class SnipFinishEvent {} 36 | 37 | class PositionChangeEvent { 38 | final newPosition; 39 | 40 | PositionChangeEvent(this.newPosition); 41 | } 42 | 43 | class OffsetEvent { 44 | final double offset; 45 | final double progress; 46 | final int centerPosition; 47 | final int nextPosition; 48 | 49 | OffsetEvent( 50 | this.offset, this.progress, this.centerPosition, this.nextPosition); 51 | } 52 | 53 | class UiEvent { 54 | final int center; 55 | final int next; 56 | final double progress; 57 | 58 | UiEvent(this.center, this.next, this.progress); 59 | } -------------------------------------------------------------------------------- /lib/snaplist_view.dart: -------------------------------------------------------------------------------- 1 | import 'package:flutter/widgets.dart'; 2 | import 'package:snaplist/size_providers.dart'; 3 | import 'package:snaplist/snaplist_bloc.dart'; 4 | import 'package:snaplist/snaplist_controller.dart'; 5 | import 'package:snaplist/snaplist_events.dart'; 6 | 7 | class SnapList extends StatefulWidget { 8 | final SeparatorSizeProvider separatorProvider; 9 | final CardSizeProvider sizeProvider; 10 | final CardBuilder builder; 11 | final int count; 12 | 13 | final ScrollProgressUpdate progressUpdate; 14 | final PositionUpdate positionUpdate; 15 | final ScrollStart scrollStart; 16 | final Axis axis; 17 | 18 | final Duration snipDuration; 19 | final Curve snipCurve; 20 | 21 | final EdgeInsets padding; 22 | final Alignment alignment; 23 | final double swipeVelocity; 24 | 25 | final SnaplistController snaplistController; 26 | 27 | SnapList({ 28 | Key key, 29 | @required this.sizeProvider, 30 | @required this.builder, 31 | @required this.separatorProvider, 32 | @required this.count, 33 | this.padding, 34 | this.progressUpdate, 35 | this.positionUpdate, 36 | this.scrollStart, 37 | this.axis = Axis.horizontal, 38 | this.snipDuration, 39 | this.snipCurve, 40 | this.alignment = Alignment.center, 41 | this.swipeVelocity = 0.0, 42 | this.snaplistController, 43 | }) : super(key: key) { 44 | assert(this.sizeProvider != null); 45 | assert(this.builder != null); 46 | assert(this.separatorProvider != null); 47 | assert(this.count != null); 48 | } 49 | 50 | @override 51 | State createState() => _SnapListState(); 52 | } 53 | 54 | class _SnapListState extends State with TickerProviderStateMixin { 55 | GlobalKey _listKey = GlobalKey(); 56 | ScrollController _controller = ScrollController(); 57 | 58 | SnapListBloc bloc; 59 | 60 | AnimationController _snipController; 61 | Tween _progressTween = Tween(); 62 | Tween _snipTween = Tween(); 63 | 64 | @override 65 | void initState() { 66 | bloc = SnapListBloc( 67 | itemsCount: widget.count, 68 | sizeProvider: widget.sizeProvider, 69 | axis: widget.axis, 70 | separatorProvider: widget.separatorProvider, 71 | swipeVelocity: widget.swipeVelocity 72 | ); 73 | 74 | bloc.offsetStream.listen((event) { 75 | _controller.jumpTo(event.offset); 76 | _updateProgress(event.progress, event.centerPosition, event.nextPosition); 77 | }); 78 | 79 | bloc.positionStream.listen((event) { 80 | _updatePosition(event.newPosition); 81 | }); 82 | 83 | bloc.snipStartStream.listen((event) { 84 | _snipTween = Tween(begin: event.offset, end: event.targetOffset); 85 | _progressTween = Tween(begin: event.progress, end: 100.0); 86 | 87 | _snipController.forward(from: 0.0); 88 | }); 89 | 90 | bloc.explicitPositionChangeStream.listen((offset) { 91 | print("new offset: $offset"); 92 | _controller.jumpTo(offset); 93 | }); 94 | 95 | _snipController = AnimationController( 96 | vsync: this, 97 | duration: widget.snipDuration ?? Duration(milliseconds: 300)) 98 | ..addListener(() { 99 | Animation resultAnimation = _snipController; 100 | if (widget.snipCurve != null) { 101 | resultAnimation = CurvedAnimation(parent: _snipController, curve: widget.snipCurve); 102 | } 103 | final scrollProgress = _progressTween.evaluate(resultAnimation); 104 | final snip = _snipTween.evaluate(resultAnimation); 105 | bloc.snipUpdateSink.add(SnipUpdateEvent(snip, scrollProgress)); 106 | }) 107 | ..addStatusListener((status) { 108 | if (status == AnimationStatus.completed) { 109 | bloc.snipFinishSink.add(SnipFinishEvent()); 110 | } 111 | }); 112 | 113 | widget.snaplistController?.positionChanged = (position) { 114 | bloc.explicitPositionChangeSink.add(position); 115 | }; 116 | 117 | if (widget.snaplistController?.initialPosition != null) { 118 | bloc.explicitPositionChangeSink.add(widget.snaplistController.initialPosition); 119 | } 120 | 121 | super.initState(); 122 | } 123 | 124 | _updateProgress( 125 | double progress, int centerItemPosition, int nextItemPosition) { 126 | if (widget.progressUpdate != null) { 127 | widget.progressUpdate(progress, centerItemPosition, nextItemPosition); 128 | } 129 | } 130 | 131 | _updatePosition(int newPosition) { 132 | if (widget.positionUpdate != null) { 133 | widget.positionUpdate(newPosition); 134 | } 135 | } 136 | 137 | @override 138 | void didUpdateWidget(SnapList oldWidget) { 139 | bloc.itemCountSink.add(widget.count); 140 | 141 | super.didUpdateWidget(oldWidget); 142 | bloc.initializeField( 143 | itemsCount: widget.count, 144 | sizeProvider: widget.sizeProvider, 145 | axis: widget.axis, 146 | separatorProvider: widget.separatorProvider, 147 | swipeVelocity: widget.swipeVelocity, 148 | ); 149 | 150 | widget.snaplistController?.positionChanged = (position) { 151 | bloc.explicitPositionChangeSink.add(position); 152 | }; 153 | } 154 | 155 | @override 156 | Widget build(BuildContext context) { 157 | return StreamBuilder( 158 | initialData: UiEvent(0, -1, 0.0), 159 | stream: bloc.uiStream, 160 | builder: (context, snapshot) { 161 | UiEvent event = snapshot.data; 162 | 163 | if (isAnimating) { 164 | return _buildList(event.center, event.next, event.progress); 165 | } 166 | if (widget.axis == Axis.vertical) { 167 | return GestureDetector( 168 | onVerticalDragStart: _onVerticalStart, 169 | onVerticalDragUpdate: _onVerticalUpdate, 170 | onVerticalDragEnd: _onVerticalEnd, 171 | child: _buildList(event.center, event.next, event.progress), 172 | ); 173 | } else { 174 | return GestureDetector( 175 | onHorizontalDragStart: _onHorizontalStart, 176 | onHorizontalDragUpdate: _onHorizontalUpdate, 177 | onHorizontalDragEnd: _onHorizontalEnd, 178 | child: _buildList(event.center, event.next, event.progress), 179 | ); 180 | } 181 | }, 182 | ); 183 | } 184 | 185 | _buildList(int center, int next, double progress) { 186 | return ListView.separated( 187 | key: _listKey, 188 | padding: widget.padding, 189 | scrollDirection: widget.axis, 190 | physics: NeverScrollableScrollPhysics(), 191 | controller: _controller, 192 | separatorBuilder: (context, index) { 193 | if (widget.axis == Axis.vertical) { 194 | return SizedBox( 195 | height: widget 196 | .separatorProvider(index, BuilderData(center, next, progress)) 197 | .height, 198 | ); 199 | } else { 200 | return SizedBox( 201 | width: widget 202 | .separatorProvider(index, BuilderData(center, next, progress)) 203 | .width, 204 | ); 205 | } 206 | }, 207 | itemBuilder: (context, index) { 208 | final builderData = BuilderData(center, next, progress); 209 | final size = widget.sizeProvider(index, builderData); 210 | return Align( 211 | alignment: widget.alignment, 212 | child: SizedBox.fromSize( 213 | size: size, 214 | child: widget.builder( 215 | context, 216 | index, 217 | builderData, 218 | ), 219 | ), 220 | ); 221 | }, 222 | itemCount: widget.count); 223 | } 224 | 225 | @override 226 | void dispose() { 227 | bloc.dispose(); 228 | _controller.dispose(); 229 | _snipController.dispose(); 230 | super.dispose(); 231 | } 232 | 233 | void _onHorizontalStart(DragStartDetails details) { 234 | bloc.swipeStartSink 235 | .add(StartEvent(_controller.offset, details.globalPosition.dx)); 236 | 237 | if (widget.scrollStart != null) { 238 | widget.scrollStart(); 239 | } 240 | } 241 | 242 | void _onHorizontalUpdate(DragUpdateDetails details) { 243 | bloc.swipeUpdateSink 244 | .add(UpdateEvent(details.globalPosition.dx, details.delta.dx)); 245 | } 246 | 247 | void _onHorizontalEnd(DragEndDetails details) { 248 | bloc.swipeEndSink.add(EndEvent(details.velocity.pixelsPerSecond)); 249 | } 250 | 251 | void _onVerticalStart(DragStartDetails details) { 252 | bloc.swipeStartSink 253 | .add(StartEvent(_controller.offset, details.globalPosition.dy)); 254 | 255 | if (widget.scrollStart != null) { 256 | widget.scrollStart(); 257 | } 258 | } 259 | 260 | void _onVerticalUpdate(DragUpdateDetails details) { 261 | bloc.swipeUpdateSink 262 | .add(UpdateEvent(details.globalPosition.dy, details.delta.dy)); 263 | } 264 | 265 | void _onVerticalEnd(DragEndDetails details) { 266 | bloc.swipeEndSink.add(EndEvent(details.velocity.pixelsPerSecond)); 267 | } 268 | 269 | bool get isAnimating => _snipController.isAnimating; 270 | } 271 | 272 | typedef Widget CardBuilder( 273 | BuildContext context, 274 | int position, 275 | BuilderData data, 276 | ); 277 | 278 | typedef ScrollStart(); 279 | typedef void ScrollProgressUpdate(double progress, int center, int next); 280 | typedef void PositionUpdate(int center); 281 | -------------------------------------------------------------------------------- /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: "2.3.0" 11 | boolean_selector: 12 | dependency: transitive 13 | description: 14 | name: boolean_selector 15 | url: "https://pub.dartlang.org" 16 | source: hosted 17 | version: "1.0.5" 18 | charcode: 19 | dependency: transitive 20 | description: 21 | name: charcode 22 | url: "https://pub.dartlang.org" 23 | source: hosted 24 | version: "1.1.2" 25 | collection: 26 | dependency: transitive 27 | description: 28 | name: collection 29 | url: "https://pub.dartlang.org" 30 | source: hosted 31 | version: "1.14.11" 32 | flutter: 33 | dependency: "direct main" 34 | description: flutter 35 | source: sdk 36 | version: "0.0.0" 37 | flutter_test: 38 | dependency: "direct dev" 39 | description: flutter 40 | source: sdk 41 | version: "0.0.0" 42 | matcher: 43 | dependency: transitive 44 | description: 45 | name: matcher 46 | url: "https://pub.dartlang.org" 47 | source: hosted 48 | version: "0.12.5" 49 | meta: 50 | dependency: transitive 51 | description: 52 | name: meta 53 | url: "https://pub.dartlang.org" 54 | source: hosted 55 | version: "1.1.7" 56 | path: 57 | dependency: transitive 58 | description: 59 | name: path 60 | url: "https://pub.dartlang.org" 61 | source: hosted 62 | version: "1.6.4" 63 | pedantic: 64 | dependency: transitive 65 | description: 66 | name: pedantic 67 | url: "https://pub.dartlang.org" 68 | source: hosted 69 | version: "1.8.0+1" 70 | quiver: 71 | dependency: transitive 72 | description: 73 | name: quiver 74 | url: "https://pub.dartlang.org" 75 | source: hosted 76 | version: "2.0.5" 77 | sky_engine: 78 | dependency: transitive 79 | description: flutter 80 | source: sdk 81 | version: "0.0.99" 82 | source_span: 83 | dependency: transitive 84 | description: 85 | name: source_span 86 | url: "https://pub.dartlang.org" 87 | source: hosted 88 | version: "1.5.5" 89 | stack_trace: 90 | dependency: transitive 91 | description: 92 | name: stack_trace 93 | url: "https://pub.dartlang.org" 94 | source: hosted 95 | version: "1.9.3" 96 | stream_channel: 97 | dependency: transitive 98 | description: 99 | name: stream_channel 100 | url: "https://pub.dartlang.org" 101 | source: hosted 102 | version: "2.0.0" 103 | string_scanner: 104 | dependency: transitive 105 | description: 106 | name: string_scanner 107 | url: "https://pub.dartlang.org" 108 | source: hosted 109 | version: "1.0.5" 110 | term_glyph: 111 | dependency: transitive 112 | description: 113 | name: term_glyph 114 | url: "https://pub.dartlang.org" 115 | source: hosted 116 | version: "1.1.0" 117 | test_api: 118 | dependency: transitive 119 | description: 120 | name: test_api 121 | url: "https://pub.dartlang.org" 122 | source: hosted 123 | version: "0.2.5" 124 | typed_data: 125 | dependency: transitive 126 | description: 127 | name: typed_data 128 | url: "https://pub.dartlang.org" 129 | source: hosted 130 | version: "1.1.6" 131 | vector_math: 132 | dependency: transitive 133 | description: 134 | name: vector_math 135 | url: "https://pub.dartlang.org" 136 | source: hosted 137 | version: "2.0.8" 138 | sdks: 139 | dart: ">=2.2.2 <3.0.0" 140 | -------------------------------------------------------------------------------- /pubspec.yaml: -------------------------------------------------------------------------------- 1 | name: snaplist 2 | description: A small library that allows to create lists with snapping to item. 3 | version: 0.1.8 4 | author: David Leibovych 5 | homepage: https://github.com/ariedov/flutter_snaplist 6 | 7 | environment: 8 | sdk: ">=2.2.0 <3.0.0" 9 | 10 | dependencies: 11 | flutter: 12 | sdk: flutter 13 | 14 | dev_dependencies: 15 | flutter_test: 16 | sdk: flutter 17 | 18 | flutter: 19 | 20 | -------------------------------------------------------------------------------- /snaplist.iml: -------------------------------------------------------------------------------- 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 | -------------------------------------------------------------------------------- /test/event_matchers.dart: -------------------------------------------------------------------------------- 1 | import 'package:flutter_test/flutter_test.dart'; 2 | import 'package:snaplist/snaplist_events.dart'; 3 | 4 | class OffsetMatcher extends Matcher { 5 | final OffsetEvent expected; 6 | OffsetMatcher(this.expected); 7 | 8 | @override 9 | Description describe(Description description) => 10 | description.add("did not match"); 11 | 12 | @override 13 | bool matches(item, Map matchState) { 14 | OffsetEvent event = item; 15 | return expected.offset == event.offset && 16 | expected.progress == event.progress && 17 | expected.centerPosition == event.centerPosition && 18 | expected.nextPosition == event.nextPosition; 19 | } 20 | } 21 | 22 | class SnipStartMatcher extends Matcher { 23 | final SnipStartEvent expected; 24 | SnipStartMatcher(this.expected); 25 | 26 | @override 27 | Description describe(Description description) => 28 | description.add("did not match"); 29 | 30 | @override 31 | bool matches(item, Map matchState) { 32 | SnipStartEvent event = item; 33 | return expected.offset == event.offset && 34 | expected.progress == event.progress && 35 | expected.targetOffset == event.targetOffset; 36 | } 37 | } 38 | 39 | class PositionChangeMatcher extends Matcher { 40 | final PositionChangeEvent expected; 41 | PositionChangeMatcher(this.expected); 42 | 43 | @override 44 | Description describe(Description description) => description.add("did not match"); 45 | 46 | @override 47 | bool matches(item, Map matchState) { 48 | PositionChangeEvent event = item; 49 | return event.newPosition == expected.newPosition; 50 | } 51 | } -------------------------------------------------------------------------------- /test/snaplist_controller_test.dart: -------------------------------------------------------------------------------- 1 | import 'package:snaplist/snaplist_controller.dart'; 2 | import 'package:test_api/test_api.dart'; 3 | 4 | void main() { 5 | test("position change test", () { 6 | var position; 7 | 8 | final controller = SnaplistController(); 9 | controller.positionChanged = (newPosition) => { 10 | position = newPosition 11 | }; 12 | 13 | controller.setPosition(1); 14 | 15 | expect(position, 1); 16 | }); 17 | 18 | test("position change test multiple times", () { 19 | var position = []; 20 | 21 | final controller = SnaplistController(); 22 | controller.positionChanged = (newPosition) => { 23 | position.add(newPosition) 24 | }; 25 | 26 | controller.setPosition(1); 27 | controller.setPosition(2); 28 | 29 | expect(position.length, 2); 30 | expect(position[0], 1); 31 | expect(position[1], 2); 32 | }); 33 | } 34 | -------------------------------------------------------------------------------- /test/snaplist_test.dart: -------------------------------------------------------------------------------- 1 | import 'dart:ui'; 2 | 3 | import 'package:flutter_test/flutter_test.dart'; 4 | import 'package:snaplist/snaplist_bloc.dart'; 5 | import 'package:snaplist/snaplist_events.dart'; 6 | 7 | import 'event_matchers.dart'; 8 | 9 | void main() { 10 | test("full scroll test", () { 11 | final bloc = SnapListBloc( 12 | itemsCount: 10, 13 | separatorProvider: (index, data) => Size(10.0, 10.0), 14 | sizeProvider: (index, data) => Size(50.0, 50.0), 15 | swipeVelocity: 0.0); 16 | 17 | expect(bloc.offsetStream, 18 | emits(OffsetMatcher(OffsetEvent(-10.0, 40.0, 0, 1)))); 19 | 20 | expect(bloc.snipStartStream, 21 | emits(SnipStartMatcher(SnipStartEvent(-10.0, 60.0, 40.0)))); 22 | 23 | expect(bloc.positionStream, 24 | emits(PositionChangeMatcher(PositionChangeEvent(1)))); 25 | 26 | bloc.swipeStartSink.add(StartEvent(0.0, 50.0)); 27 | bloc.swipeUpdateSink.add(UpdateEvent(30.0, 10.0)); 28 | bloc.swipeEndSink.add(EndEvent(Offset(1000.0, 1000.0))); 29 | 30 | bloc.snipFinishSink.add(SnipFinishEvent()); 31 | }); 32 | 33 | test("explicit item set test", () { 34 | final bloc = SnapListBloc( 35 | itemsCount: 10, 36 | separatorProvider: (index, data) => Size(10.0, 10.0), 37 | sizeProvider: (index, data) => Size(50.0, 50.0), 38 | swipeVelocity: 0.0); 39 | 40 | expect(bloc.explicitPositionChangeStream, emits(180)); 41 | 42 | bloc.explicitPositionChangeSink.add(3); 43 | }); 44 | } 45 | --------------------------------------------------------------------------------