├── .devcontainer └── devcontainer.json ├── .github └── publish.yml ├── .gitignore ├── .metadata ├── .vscode └── launch.json ├── CHANGELOG.md ├── LICENSE ├── README.md ├── analysis_options.yaml ├── asset ├── custom_scrollview_with_lazy_track.gif ├── hight_change_listview_with_lazy_track.gif ├── hight_change_listview_without_lazy_track.gif └── listview_without_lazy.gif ├── example ├── .gitignore ├── .metadata ├── README.md ├── analysis_options.yaml ├── 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 ├── test │ └── widget_test.dart └── web │ ├── favicon.png │ ├── icons │ ├── Icon-192.png │ ├── Icon-512.png │ ├── Icon-maskable-192.png │ └── Icon-maskable-512.png │ ├── index.html │ └── manifest.json ├── lib ├── exposure.dart └── src │ ├── exposure_widget.dart │ ├── scroll_detail_provider.dart │ └── scroll_notification_publisher.dart ├── pubspec.lock ├── pubspec.yaml └── test └── exposure_test.dart /.devcontainer/devcontainer.json: -------------------------------------------------------------------------------- 1 | { 2 | "image": "cirrusci/flutter:beta", 3 | "forwardPorts": [3000] 4 | } -------------------------------------------------------------------------------- /.github/publish.yml: -------------------------------------------------------------------------------- 1 | - name: Publish Dart/Flutter package 2 | # You may pin to the exact commit or the version. 3 | # uses: sakebook/actions-flutter-pub-publisher@ccd9fbba502ea7ef33ea2479e0cdac5a2a9766e1 4 | uses: sakebook/actions-flutter-pub-publisher@v1.4.1 5 | with: 6 | # Google Account credential 7 | credential: 8 | # (Optional) Publish packages type. (default: true) 9 | flutter_package: # optional, default is true 10 | # (Optional) Skip test (default: false) 11 | skip_test: # optional 12 | # (Optional) Package directory (default: ".") 13 | package_directory: # optional, default is . 14 | # (Optional) Dry run, no publish (default: false) 15 | dry_run: # optional 16 | -------------------------------------------------------------------------------- /.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 | .dart_tool/ 26 | .flutter-plugins 27 | .flutter-plugins-dependencies 28 | .packages 29 | .pub-cache/ 30 | .pub/ 31 | build/ 32 | 33 | # Android related 34 | **/android/**/gradle-wrapper.jar 35 | **/android/.gradle 36 | **/android/captures/ 37 | **/android/gradlew 38 | **/android/gradlew.bat 39 | **/android/local.properties 40 | **/android/**/GeneratedPluginRegistrant.java 41 | 42 | # iOS/XCode related 43 | **/ios/**/*.mode1v3 44 | **/ios/**/*.mode2v3 45 | **/ios/**/*.moved-aside 46 | **/ios/**/*.pbxuser 47 | **/ios/**/*.perspectivev3 48 | **/ios/**/*sync/ 49 | **/ios/**/.sconsign.dblite 50 | **/ios/**/.tags* 51 | **/ios/**/.vagrant/ 52 | **/ios/**/DerivedData/ 53 | **/ios/**/Icon? 54 | **/ios/**/Pods/ 55 | **/ios/**/.symlinks/ 56 | **/ios/**/profile 57 | **/ios/**/xcuserdata 58 | **/ios/.generated/ 59 | **/ios/Flutter/App.framework 60 | **/ios/Flutter/Flutter.framework 61 | **/ios/Flutter/Flutter.podspec 62 | **/ios/Flutter/Generated.xcconfig 63 | **/ios/Flutter/ephemeral 64 | **/ios/Flutter/app.flx 65 | **/ios/Flutter/app.zip 66 | **/ios/Flutter/flutter_assets/ 67 | **/ios/Flutter/flutter_export_environment.sh 68 | **/ios/ServiceDefinitions.json 69 | **/ios/Runner/GeneratedPluginRegistrant.* 70 | 71 | # Exceptions to above rules. 72 | !**/ios/**/default.mode1v3 73 | !**/ios/**/default.mode2v3 74 | !**/ios/**/default.pbxuser 75 | !**/ios/**/default.perspectivev3 76 | -------------------------------------------------------------------------------- /.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: 19c61fed0da681ba2068c97e22add3bde38e51e4 8 | channel: beta 9 | 10 | project_type: package 11 | -------------------------------------------------------------------------------- /.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_exposure", 9 | "request": "launch", 10 | "type": "dart", 11 | }, 12 | { 13 | "name": "flutter_exposure (profile mode)", 14 | "request": "launch", 15 | "type": "dart", 16 | "flutterMode": "profile" 17 | }, 18 | { 19 | "name": "flutter_exposure (release mode)", 20 | "request": "launch", 21 | "type": "dart", 22 | "flutterMode": "release" 23 | }, 24 | { 25 | "name": "example", 26 | "cwd": "example", 27 | "request": "launch", 28 | "type": "dart" 29 | }, 30 | { 31 | "name": "example (profile mode)", 32 | "cwd": "example", 33 | "request": "launch", 34 | "type": "dart", 35 | "flutterMode": "profile" 36 | }, 37 | { 38 | "name": "example (release mode)", 39 | "cwd": "example", 40 | "request": "launch", 41 | "type": "dart", 42 | "flutterMode": "release" 43 | } 44 | ] 45 | } -------------------------------------------------------------------------------- /CHANGELOG.md: -------------------------------------------------------------------------------- 1 | ## 0.0.1 2 | * support scrollable widget exposure 3 | * doesn't support dynamic height (in scroll direction) widget 4 | 5 | ## 0.0.2 6 | * fix a null safety issue 7 | 8 | ## 0.0.3 9 | * fix a null safety issue to adapt flutter 3.0.5 10 | * fix exposure factor doesn't work in first frame 11 | * support expose check manually 12 | 13 | ### 0.0.4 14 | * adapt flutter 3 15 | * fix StreamController is change when setState called 16 | * add new feature `exposureOnce` on Exposure widget, if this is true, the onExpose will only be called once -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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Depend on it 8 | Add this to your package's pubspec.yaml file: 9 | 10 | ``` yaml 11 | dependencies: 12 | flutter_exposure: ^0.0.2 13 | ``` 14 | 15 | 2. Install it 16 | You can install packages from the command line: 17 | with pub: 18 | 19 | ``` 20 | $ pub get 21 | ``` 22 | with Flutter: 23 | 24 | ``` 25 | $ flutter pub get 26 | ``` 27 | 28 | 3. Import it # 29 | Now in your Dart code, you can use: 30 | 31 | ``` dart 32 | import 'package:exposure/exposure.dart'; 33 | ``` 34 | ## Usage 35 | Wrap `ScrollDetailProvider` widget on your ScrollView, 36 | then Wrap `Exposure` on the widget you want to know when user see it. 37 | You can get `onExpose` callback when widget expose. 38 | 39 | If you want to wait until the scroll is over to detect exposure, 40 | you can set the `lazy` property of `ScrollDetailProvider` to true. 41 | 42 | You can also control the proportion of widgets you want to expose through `exposeFactor`. 43 | 44 | ```dart 45 | ScrollDetailProvider( 46 | lazy: true, // default value: false 47 | child: ListView.builder( 48 | itemCount: 200, 49 | itemBuilder: (context, index) { 50 | return Exposure( 51 | exposureOnce: true, // if this is true, the onExpose will only be called once 52 | exposeFactor: 0.9, // default value: 0.5 53 | onExpose: () { // required 54 | debugPrint('$index'); 55 | }, 56 | onHide: (duration) { 57 | debugPrint('$duration'); 58 | }, 59 | child: Text('$index'), 60 | ); 61 | }, 62 | ), 63 | ) 64 | ``` 65 | 66 | ### check current expose widget 67 | Sometimes you may want to check current widget is exposed or not. 68 | For example the data send back from network, then you update the list. 69 | At this time, you want to get which item is exposed. 70 | You can use `ExposureController` to trigger `onExpose` callback， 71 | which item current visible on the screen. 72 | 73 | ```dart 74 | // create a ExposureController 75 | ExposureController _controller = ExposureController(); 76 | 77 | // set _controller to exposureController 78 | ScrollDetailProvider( 79 | lazy: true, // default value: false 80 | child: ListView.builder( 81 | itemCount: 200, 82 | itemBuilder: (context, index) { 83 | return Exposure( 84 | exposureController: controller, 85 | exposeFactor: 0.9, // default value: 0.5 86 | onExpose: () { // required 87 | debugPrint('$index'); 88 | }, 89 | onHide: (duration) { 90 | debugPrint('$duration'); 91 | }, 92 | child: Text('$index'), 93 | ); 94 | }, 95 | ), 96 | ) 97 | 98 | // trigger a expose check event 99 | _controller.reCheckExposeState(); 100 | ``` 101 | 102 | ## Example 103 | 104 | Here is some example of usage. 105 | 106 | #### Track It Every Time 107 | 108 | A `ListView` has items of different heights, tracking the time when each item enters the user's field of vision. 109 | 110 | ![hight_change_listview_without_lazy_track](./asset/hight_change_listview_without_lazy_track.gif) 111 | 112 | #### Lazy Track 113 | 114 | A `ListView` has items of different heights, and only when the scrolling is over, the items in the field of view are tracked. 115 | 116 | ![hight_change_listview_with_lazy_track](./asset/hight_change_listview_with_lazy_track.gif) 117 | 118 | 119 | 120 | #### CustomScrollView 121 | 122 | It also support track in `CustomScrollView` with different slivers. 123 | 124 | 125 | 126 | ![custom_scrollview_with_lazy_track](./asset/custom_scrollview_with_lazy_track.gif) 127 | 128 | ## Bugs or Requests 129 | 130 | If you encounter any problems feel free to open an [issue](https://github.com/Vadaski/flutter_exposure/issues). If you feel the library is missing a feature, please raise a ticket on GitHub and I'll look into it. Pull request are also welcome. 131 | 132 | -------------------------------------------------------------------------------- /analysis_options.yaml: -------------------------------------------------------------------------------- 1 | include: package:flutter_lints/flutter.yaml 2 | 3 | # Additional information about this file can be found at 4 | # https://dart.dev/guides/language/analysis-options 5 | -------------------------------------------------------------------------------- /asset/custom_scrollview_with_lazy_track.gif: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Vadaski/flutter_exposure/ca1b6e81b7807c9855e59d054950032a07ca32a6/asset/custom_scrollview_with_lazy_track.gif -------------------------------------------------------------------------------- /asset/hight_change_listview_with_lazy_track.gif: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Vadaski/flutter_exposure/ca1b6e81b7807c9855e59d054950032a07ca32a6/asset/hight_change_listview_with_lazy_track.gif -------------------------------------------------------------------------------- /asset/hight_change_listview_without_lazy_track.gif: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Vadaski/flutter_exposure/ca1b6e81b7807c9855e59d054950032a07ca32a6/asset/hight_change_listview_without_lazy_track.gif -------------------------------------------------------------------------------- /asset/listview_without_lazy.gif: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Vadaski/flutter_exposure/ca1b6e81b7807c9855e59d054950032a07ca32a6/asset/listview_without_lazy.gif -------------------------------------------------------------------------------- /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: ffb2ecea5223acdd139a5039be2f9c796962833d 8 | channel: stable 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/analysis_options.yaml: -------------------------------------------------------------------------------- 1 | # This file configures the analyzer, which statically analyzes Dart code to 2 | # check for errors, warnings, and lints. 3 | # 4 | # The issues identified by the analyzer are surfaced in the UI of Dart-enabled 5 | # IDEs (https://dart.dev/tools#ides-and-editors). The analyzer can also be 6 | # invoked from the command line by running `flutter analyze`. 7 | 8 | # The following line activates a set of recommended lints for Flutter apps, 9 | # packages, and plugins designed to encourage good coding practices. 10 | include: package:flutter_lints/flutter.yaml 11 | 12 | linter: 13 | # The lint rules applied to this project can be customized in the 14 | # section below to disable rules from the `package:flutter_lints/flutter.yaml` 15 | # included above or to enable additional rules. A list of all available lints 16 | # and their documentation is published at 17 | # https://dart-lang.github.io/linter/lints/index.html. 18 | # 19 | # Instead of disabling a lint rule for the entire project in the 20 | # section below, it can also be suppressed for a single line of code 21 | # or a specific dart file by using the `// ignore: name_of_lint` and 22 | # `// ignore_for_file: name_of_lint` syntax on the line or in the file 23 | # producing the lint. 24 | rules: 25 | # avoid_print: false # Uncomment to disable the `avoid_print` rule 26 | # prefer_single_quotes: true # Uncomment to enable the `prefer_single_quotes` rule 27 | 28 | # Additional information about this file can be found at 29 | # https://dart.dev/guides/language/analysis-options 30 | -------------------------------------------------------------------------------- /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 | **/*.keystore 13 | **/*.jks 14 | -------------------------------------------------------------------------------- /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: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle" 27 | 28 | android { 29 | compileSdkVersion 31 30 | 31 | compileOptions { 32 | sourceCompatibility JavaVersion.VERSION_1_8 33 | targetCompatibility JavaVersion.VERSION_1_8 34 | } 35 | 36 | kotlinOptions { 37 | jvmTarget = '1.8' 38 | } 39 | 40 | sourceSets { 41 | main.java.srcDirs += 'src/main/kotlin' 42 | } 43 | 44 | defaultConfig { 45 | // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html). 46 | applicationId "com.example.example" 47 | minSdkVersion 16 48 | targetSdkVersion 31 49 | versionCode flutterVersionCode.toInteger() 50 | versionName flutterVersionName 51 | } 52 | 53 | buildTypes { 54 | release { 55 | // TODO: Add your own signing config for the release build. 56 | // Signing with the debug keys for now, so `flutter run --release` works. 57 | signingConfig signingConfigs.debug 58 | } 59 | } 60 | } 61 | 62 | flutter { 63 | source '../..' 64 | } 65 | 66 | dependencies { 67 | implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version" 68 | } 69 | -------------------------------------------------------------------------------- /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/Vadaski/flutter_exposure/ca1b6e81b7807c9855e59d054950032a07ca32a6/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/Vadaski/flutter_exposure/ca1b6e81b7807c9855e59d054950032a07ca32a6/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/Vadaski/flutter_exposure/ca1b6e81b7807c9855e59d054950032a07ca32a6/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/Vadaski/flutter_exposure/ca1b6e81b7807c9855e59d054950032a07ca32a6/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/Vadaski/flutter_exposure/ca1b6e81b7807c9855e59d054950032a07ca32a6/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 = '1.6.21' 3 | repositories { 4 | google() 5 | mavenCentral() 6 | } 7 | 8 | dependencies { 9 | classpath 'com.android.tools.build:gradle:4.1.0' 10 | classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version" 11 | } 12 | } 13 | 14 | allprojects { 15 | repositories { 16 | google() 17 | mavenCentral() 18 | } 19 | } 20 | 21 | rootProject.buildDir = '../build' 22 | subprojects { 23 | project.buildDir = "${rootProject.buildDir}/${project.name}" 24 | project.evaluationDependsOn(':app') 25 | } 26 | 27 | task clean(type: Delete) { 28 | delete rootProject.buildDir 29 | } 30 | -------------------------------------------------------------------------------- /example/android/gradle.properties: -------------------------------------------------------------------------------- 1 | org.gradle.jvmargs=-Xmx1536M 2 | android.useAndroidX=true 3 | android.enableJetifier=true 4 | -------------------------------------------------------------------------------- /example/android/gradle/wrapper/gradle-wrapper.properties: -------------------------------------------------------------------------------- 1 | #Fri Jun 23 08:50:38 CEST 2017 2 | distributionBase=GRADLE_USER_HOME 3 | distributionPath=wrapper/dists 4 | zipStoreBase=GRADLE_USER_HOME 5 | zipStorePath=wrapper/dists 6 | distributionUrl=https\://services.gradle.org/distributions/gradle-6.7-all.zip 7 | -------------------------------------------------------------------------------- /example/android/settings.gradle: -------------------------------------------------------------------------------- 1 | include ':app' 2 | 3 | def localPropertiesFile = new File(rootProject.projectDir, "local.properties") 4 | def properties = new Properties() 5 | 6 | assert localPropertiesFile.exists() 7 | localPropertiesFile.withReader("UTF-8") { reader -> properties.load(reader) } 8 | 9 | def flutterSdkPath = properties.getProperty("flutter.sdk") 10 | assert flutterSdkPath != null, "flutter.sdk not set in local.properties" 11 | apply from: "$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/ephemeral/ 22 | Flutter/app.flx 23 | Flutter/app.zip 24 | Flutter/flutter_assets/ 25 | Flutter/flutter_export_environment.sh 26 | ServiceDefinitions.json 27 | Runner/GeneratedPluginRegistrant.* 28 | 29 | # Exceptions to above rules. 30 | !default.mode1v3 31 | !default.mode2v3 32 | !default.pbxuser 33 | !default.perspectivev3 34 | -------------------------------------------------------------------------------- /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 | 9.0 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/Runner.xcodeproj/project.pbxproj: -------------------------------------------------------------------------------- 1 | // !$*UTF8*$! 2 | { 3 | archiveVersion = 1; 4 | classes = { 5 | }; 6 | objectVersion = 50; 7 | objects = { 8 | 9 | /* Begin PBXBuildFile section */ 10 | 1498D2341E8E89220040F4C2 /* GeneratedPluginRegistrant.m in Sources */ = {isa = PBXBuildFile; fileRef = 1498D2331E8E89220040F4C2 /* GeneratedPluginRegistrant.m */; }; 11 | 3B3967161E833CAA004F5970 /* AppFrameworkInfo.plist in Resources */ = {isa = PBXBuildFile; fileRef = 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runOnlyForDeploymentPostprocessing = 0; 28 | }; 29 | /* End PBXCopyFilesBuildPhase section */ 30 | 31 | /* Begin PBXFileReference section */ 32 | 1498D2321E8E86230040F4C2 /* GeneratedPluginRegistrant.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = GeneratedPluginRegistrant.h; sourceTree = ""; }; 33 | 1498D2331E8E89220040F4C2 /* GeneratedPluginRegistrant.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GeneratedPluginRegistrant.m; sourceTree = ""; }; 34 | 3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; name = AppFrameworkInfo.plist; path = Flutter/AppFrameworkInfo.plist; sourceTree = ""; }; 35 | 74858FAD1ED2DC5600515810 /* Runner-Bridging-Header.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = "Runner-Bridging-Header.h"; sourceTree = ""; }; 36 | 74858FAE1ED2DC5600515810 /* AppDelegate.swift */ = {isa = 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*/, 463 | 249021D4217E4FDB00AE95B9 /* Profile */, 464 | ); 465 | defaultConfigurationIsVisible = 0; 466 | defaultConfigurationName = Release; 467 | }; 468 | /* End XCConfigurationList section */ 469 | }; 470 | rootObject = 97C146E61CF9000F007C117D /* Project object */; 471 | } 472 | -------------------------------------------------------------------------------- /example/ios/Runner.xcodeproj/project.xcworkspace/contents.xcworkspacedata: -------------------------------------------------------------------------------- 1 | 2 | 4 | 6 | 7 | 8 | -------------------------------------------------------------------------------- /example/ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | IDEDidComputeMac32BitWarning 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /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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https://raw.githubusercontent.com/Vadaski/flutter_exposure/ca1b6e81b7807c9855e59d054950032a07ca32a6/example/ios/Runner/Assets.xcassets/LaunchImage.imageset/LaunchImage@3x.png -------------------------------------------------------------------------------- /example/ios/Runner/Assets.xcassets/LaunchImage.imageset/README.md: -------------------------------------------------------------------------------- 1 | # Launch Screen Assets 2 | 3 | You can customize the launch screen with your own desired assets by replacing the image files in this directory. 4 | 5 | You can also do it by opening your Flutter project's Xcode project with `open ios/Runner.xcworkspace`, selecting `Runner/Assets.xcassets` in the Project Navigator and dropping in the desired images. -------------------------------------------------------------------------------- /example/ios/Runner/Base.lproj/LaunchScreen.storyboard: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | -------------------------------------------------------------------------------- /example/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:flutter_exposure/exposure.dart'; 3 | import 'package:flutter_staggered_grid_view/flutter_staggered_grid_view.dart'; 4 | 5 | void main() { 6 | runApp(const MyApp()); 7 | } 8 | 9 | class MyApp extends StatelessWidget { 10 | const MyApp({Key? key}) : super(key: key); 11 | 12 | // This widget is the root of your application. 13 | @override 14 | Widget build(BuildContext context) { 15 | return MaterialApp( 16 | title: 'Flutter Demo', 17 | theme: ThemeData( 18 | primarySwatch: Colors.blue, 19 | ), 20 | home: const MyHomePage(title: 'Flutter Demo Home Page'), 21 | ); 22 | } 23 | } 24 | 25 | class MyHomePage extends StatefulWidget { 26 | const MyHomePage({Key? key, required this.title}) : super(key: key); 27 | 28 | final String title; 29 | 30 | @override 31 | State createState() => _MyHomePageState(); 32 | } 33 | 34 | class _MyHomePageState extends State { 35 | final ExposureController _controller = ExposureController(); 36 | @override 37 | Widget build(BuildContext context) { 38 | return DefaultTabController( 39 | length: 3, 40 | child: Scaffold( 41 | appBar: const TabBar( 42 | tabs: [ 43 | Tab(text: 'ListViewDemo'), 44 | Tab(text: 'StaggeredGridViewDemo'), 45 | Tab(text: 'CustomScrollViewDemo'), 46 | ], 47 | labelColor: Colors.black, 48 | ), 49 | body: TabBarView( 50 | children: [ 51 | const ListViewDemo(), 52 | StaggeredGridViewDemo(controller: _controller), 53 | const CustomScrollViewDemo(), 54 | ], 55 | ), 56 | floatingActionButton: FloatingActionButton( 57 | onPressed: () { 58 | _controller.reCheckExposeState(); 59 | }, 60 | ), 61 | ), 62 | ); 63 | } 64 | } 65 | 66 | class ListViewDemo extends StatefulWidget { 67 | const ListViewDemo({super.key}); 68 | 69 | @override 70 | State createState() => _ListViewDemoState(); 71 | } 72 | 73 | class _ListViewDemoState extends State { 74 | List colors = List.generate(20, (index) => Colors.red); 75 | 76 | void onHide(int index) { 77 | setState(() { 78 | colors[index] = Colors.red; 79 | }); 80 | } 81 | 82 | void onExpose(int index) { 83 | setState(() { 84 | colors[index] = Colors.green; 85 | }); 86 | } 87 | 88 | @override 89 | Widget build(BuildContext context) { 90 | return Scaffold( 91 | body: ScrollDetailProvider( 92 | child: ListView.builder( 93 | itemCount: colors.length, 94 | itemBuilder: (context, index) { 95 | return Exposure( 96 | exposureOnce: 97 | false, // if this is true, the onExpose will only be called once 98 | exposeFactor: 0.9, 99 | onExpose: () => onExpose(index), 100 | onHide: (_) { 101 | onHide(index); 102 | }, 103 | child: Padding( 104 | padding: const EdgeInsets.all(8.0), 105 | child: Container( 106 | height: 100, 107 | color: colors[index], 108 | child: Center( 109 | child: 110 | Text('$index', style: const TextStyle(fontSize: 20)), 111 | )), 112 | ), 113 | ); 114 | }, 115 | ), 116 | ), 117 | ); 118 | } 119 | } 120 | 121 | class StaggeredGridViewDemo extends StatelessWidget { 122 | StaggeredGridViewDemo({Key? key, required this.controller}) : super(key: key); 123 | final ScrollController _scrollController = ScrollController(); 124 | final ExposureController controller; 125 | 126 | @override 127 | Widget build(BuildContext context) { 128 | return ScrollDetailProvider( 129 | lazy: false, 130 | child: MasonryGridView.count( 131 | shrinkWrap: true, 132 | controller: _scrollController, 133 | crossAxisCount: 4, 134 | crossAxisSpacing: 4, 135 | mainAxisSpacing: 10, 136 | itemCount: 30, 137 | itemBuilder: (context, index) { 138 | return Exposure( 139 | exposureController: controller, 140 | // exposeFactor: 0.5, 141 | onExpose: () { 142 | debugPrint('$index'); 143 | }, 144 | child: Container( 145 | color: Colors.green, 146 | child: Center( 147 | child: CircleAvatar( 148 | backgroundColor: Colors.white, 149 | child: Text('$index'), 150 | ), 151 | )), 152 | ); 153 | }, 154 | ), 155 | ); 156 | } 157 | } 158 | 159 | class CustomScrollViewDemo extends StatelessWidget { 160 | const CustomScrollViewDemo({Key? key}) : super(key: key); 161 | 162 | @override 163 | Widget build(BuildContext context) { 164 | return Material( 165 | child: ScrollDetailProvider( 166 | child: CustomScrollView( 167 | slivers: [ 168 | SliverPadding( 169 | padding: const EdgeInsets.all(8.0), 170 | sliver: SliverGrid( 171 | //Grid 172 | gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount( 173 | crossAxisCount: 2, //Grid按两列显示 174 | mainAxisSpacing: 10.0, 175 | crossAxisSpacing: 10.0, 176 | childAspectRatio: 4.0, 177 | ), 178 | delegate: SliverChildBuilderDelegate( 179 | (BuildContext context, int index) { 180 | //创建子widget 181 | return Exposure( 182 | onExpose: () { 183 | debugPrint('SliverGrid$index'); 184 | }, 185 | child: Container( 186 | alignment: Alignment.center, 187 | color: Colors.cyan[100 * (index % 9)], 188 | child: Text('grid item $index'), 189 | )); 190 | }, 191 | childCount: 20, 192 | ), 193 | ), 194 | ), 195 | SliverFixedExtentList( 196 | itemExtent: 50.0, 197 | delegate: SliverChildBuilderDelegate( 198 | (BuildContext context, int index) { 199 | //创建列表项 200 | return Exposure( 201 | onExpose: () { 202 | debugPrint('SliverFixedExtentList:$index'); 203 | }, 204 | child: Container( 205 | alignment: Alignment.center, 206 | color: Colors.lightBlue[100 * (index % 9)], 207 | child: Text('list item $index'), 208 | ), 209 | ); 210 | }, 211 | childCount: 20, 212 | ), 213 | ), 214 | ], 215 | ), 216 | ), 217 | ); 218 | } 219 | } 220 | -------------------------------------------------------------------------------- /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 | sha256: "947bfcf187f74dbc5e146c9eb9c0f10c9f8b30743e341481c1e2ed3ecc18c20c" 9 | url: "https://pub.dev" 10 | source: hosted 11 | version: "2.11.0" 12 | boolean_selector: 13 | dependency: transitive 14 | description: 15 | name: boolean_selector 16 | sha256: "6cfb5af12253eaf2b368f07bacc5a80d1301a071c73360d746b7f2e32d762c66" 17 | url: "https://pub.dev" 18 | source: hosted 19 | version: "2.1.1" 20 | characters: 21 | dependency: transitive 22 | description: 23 | name: characters 24 | sha256: "04a925763edad70e8443c99234dc3328f442e811f1d8fd1a72f1c8ad0f69a605" 25 | url: "https://pub.dev" 26 | source: hosted 27 | version: "1.3.0" 28 | clock: 29 | dependency: transitive 30 | description: 31 | name: clock 32 | sha256: cb6d7f03e1de671e34607e909a7213e31d7752be4fb66a86d29fe1eb14bfb5cf 33 | url: "https://pub.dev" 34 | source: hosted 35 | version: "1.1.1" 36 | collection: 37 | dependency: transitive 38 | description: 39 | name: collection 40 | sha256: "4a07be6cb69c84d677a6c3096fcf960cc3285a8330b4603e0d463d15d9bd934c" 41 | url: "https://pub.dev" 42 | source: hosted 43 | version: "1.17.1" 44 | cupertino_icons: 45 | dependency: "direct main" 46 | description: 47 | name: cupertino_icons 48 | sha256: e35129dc44c9118cee2a5603506d823bab99c68393879edb440e0090d07586be 49 | url: "https://pub.dev" 50 | source: hosted 51 | version: "1.0.5" 52 | fake_async: 53 | dependency: transitive 54 | description: 55 | name: fake_async 56 | sha256: "511392330127add0b769b75a987850d136345d9227c6b94c96a04cf4a391bf78" 57 | url: "https://pub.dev" 58 | source: hosted 59 | version: "1.3.1" 60 | flutter: 61 | dependency: "direct main" 62 | description: flutter 63 | source: sdk 64 | version: "0.0.0" 65 | flutter_exposure: 66 | dependency: "direct main" 67 | description: 68 | path: ".." 69 | relative: true 70 | source: path 71 | version: "0.0.4" 72 | flutter_lints: 73 | dependency: "direct dev" 74 | description: 75 | name: flutter_lints 76 | sha256: b543301ad291598523947dc534aaddc5aaad597b709d2426d3a0e0d44c5cb493 77 | url: "https://pub.dev" 78 | source: hosted 79 | version: "1.0.4" 80 | flutter_staggered_grid_view: 81 | dependency: "direct main" 82 | description: 83 | name: flutter_staggered_grid_view 84 | sha256: "1312314293acceb65b92754298754801b0e1f26a1845833b740b30415bbbcf07" 85 | url: "https://pub.dev" 86 | source: hosted 87 | version: "0.6.2" 88 | flutter_test: 89 | dependency: "direct dev" 90 | description: flutter 91 | source: sdk 92 | version: "0.0.0" 93 | js: 94 | dependency: transitive 95 | description: 96 | name: js 97 | sha256: f2c445dce49627136094980615a031419f7f3eb393237e4ecd97ac15dea343f3 98 | url: "https://pub.dev" 99 | source: hosted 100 | version: "0.6.7" 101 | lints: 102 | dependency: transitive 103 | description: 104 | name: lints 105 | sha256: a2c3d198cb5ea2e179926622d433331d8b58374ab8f29cdda6e863bd62fd369c 106 | url: "https://pub.dev" 107 | source: hosted 108 | version: "1.0.1" 109 | matcher: 110 | dependency: transitive 111 | description: 112 | name: matcher 113 | sha256: "6501fbd55da300384b768785b83e5ce66991266cec21af89ab9ae7f5ce1c4cbb" 114 | url: "https://pub.dev" 115 | source: hosted 116 | version: "0.12.15" 117 | material_color_utilities: 118 | dependency: transitive 119 | description: 120 | name: material_color_utilities 121 | sha256: d92141dc6fe1dad30722f9aa826c7fbc896d021d792f80678280601aff8cf724 122 | url: "https://pub.dev" 123 | source: hosted 124 | version: "0.2.0" 125 | meta: 126 | dependency: transitive 127 | description: 128 | name: meta 129 | sha256: "3c74dbf8763d36539f114c799d8a2d87343b5067e9d796ca22b5eb8437090ee3" 130 | url: "https://pub.dev" 131 | source: hosted 132 | version: "1.9.1" 133 | path: 134 | dependency: transitive 135 | description: 136 | name: path 137 | sha256: "8829d8a55c13fc0e37127c29fedf290c102f4e40ae94ada574091fe0ff96c917" 138 | url: "https://pub.dev" 139 | source: hosted 140 | version: "1.8.3" 141 | sky_engine: 142 | dependency: transitive 143 | description: flutter 144 | source: sdk 145 | version: "0.0.99" 146 | source_span: 147 | dependency: transitive 148 | description: 149 | name: source_span 150 | sha256: dd904f795d4b4f3b870833847c461801f6750a9fa8e61ea5ac53f9422b31f250 151 | url: "https://pub.dev" 152 | source: hosted 153 | version: "1.9.1" 154 | stack_trace: 155 | dependency: transitive 156 | description: 157 | name: stack_trace 158 | sha256: c3c7d8edb15bee7f0f74debd4b9c5f3c2ea86766fe4178eb2a18eb30a0bdaed5 159 | url: "https://pub.dev" 160 | source: hosted 161 | version: "1.11.0" 162 | stream_channel: 163 | dependency: transitive 164 | description: 165 | name: stream_channel 166 | sha256: "83615bee9045c1d322bbbd1ba209b7a749c2cbcdcb3fdd1df8eb488b3279c1c8" 167 | url: "https://pub.dev" 168 | source: hosted 169 | version: "2.1.1" 170 | string_scanner: 171 | dependency: transitive 172 | description: 173 | name: string_scanner 174 | sha256: "556692adab6cfa87322a115640c11f13cb77b3f076ddcc5d6ae3c20242bedcde" 175 | url: "https://pub.dev" 176 | source: hosted 177 | version: "1.2.0" 178 | term_glyph: 179 | dependency: transitive 180 | description: 181 | name: term_glyph 182 | sha256: a29248a84fbb7c79282b40b8c72a1209db169a2e0542bce341da992fe1bc7e84 183 | url: "https://pub.dev" 184 | source: hosted 185 | version: "1.2.1" 186 | test_api: 187 | dependency: transitive 188 | description: 189 | name: test_api 190 | sha256: eb6ac1540b26de412b3403a163d919ba86f6a973fe6cc50ae3541b80092fdcfb 191 | url: "https://pub.dev" 192 | source: hosted 193 | version: "0.5.1" 194 | vector_math: 195 | dependency: transitive 196 | description: 197 | name: vector_math 198 | sha256: "80b3257d1492ce4d091729e3a67a60407d227c27241d6927be0130c98e741803" 199 | url: "https://pub.dev" 200 | source: hosted 201 | version: "2.1.4" 202 | sdks: 203 | dart: ">=3.0.0-0 <4.0.0" 204 | flutter: ">=2.0.0" 205 | -------------------------------------------------------------------------------- /example/pubspec.yaml: -------------------------------------------------------------------------------- 1 | name: example 2 | description: A new Flutter project. 3 | 4 | # The following line prevents the package from being accidentally published to 5 | # pub.dev using `flutter pub publish`. This is preferred for private packages. 6 | publish_to: 'none' # Remove this line if you wish to publish to pub.dev 7 | 8 | # The following defines the version and build number for your application. 9 | # A version number is three numbers separated by dots, like 1.2.43 10 | # followed by an optional build number separated by a +. 11 | # Both the version and the builder number may be overridden in flutter 12 | # build by specifying --build-name and --build-number, respectively. 13 | # In Android, build-name is used as versionName while build-number used as versionCode. 14 | # Read more about Android versioning at https://developer.android.com/studio/publish/versioning 15 | # In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion. 16 | # Read more about iOS versioning at 17 | # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html 18 | version: 1.0.0+1 19 | 20 | environment: 21 | sdk: '>=2.18.0 <3.0.0' 22 | 23 | # Dependencies specify other packages that your package needs in order to work. 24 | # To automatically upgrade your package dependencies to the latest versions 25 | # consider running `flutter pub upgrade --major-versions`. Alternatively, 26 | # dependencies can be manually updated by changing the version numbers below to 27 | # the latest version available on pub.dev. To see which dependencies have newer 28 | # versions available, run `flutter pub outdated`. 29 | dependencies: 30 | flutter: 31 | sdk: flutter 32 | flutter_staggered_grid_view: ^0.6.2 33 | flutter_exposure: 34 | path: ../../flutter_exposure 35 | 36 | 37 | # The following adds the Cupertino Icons font to your application. 38 | # Use with the CupertinoIcons class for iOS style icons. 39 | cupertino_icons: ^1.0.2 40 | 41 | dev_dependencies: 42 | flutter_test: 43 | sdk: flutter 44 | 45 | # The "flutter_lints" package below contains a set of recommended lints to 46 | # encourage good coding practices. The lint set provided by the package is 47 | # activated in the `analysis_options.yaml` file located at the root of your 48 | # package. See that file for information about deactivating specific lint 49 | # rules and activating additional ones. 50 | flutter_lints: ^1.0.0 51 | 52 | # For information on the generic Dart part of this file, see the 53 | # following page: https://dart.dev/tools/pub/pubspec 54 | 55 | # The following section is specific to Flutter. 56 | flutter: 57 | 58 | # The following line ensures that the Material Icons font is 59 | # included with your application, so that you can use the icons in 60 | # the material Icons class. 61 | uses-material-design: true 62 | 63 | # To add assets to your application, add an assets section, like this: 64 | # assets: 65 | # - images/a_dot_burr.jpeg 66 | # - images/a_dot_ham.jpeg 67 | 68 | # An image asset can refer to one or more resolution-specific "variants", see 69 | # https://flutter.dev/assets-and-images/#resolution-aware. 70 | 71 | # For details regarding adding assets from package dependencies, see 72 | # https://flutter.dev/assets-and-images/#from-packages 73 | 74 | # To add custom fonts to your application, add a fonts section here, 75 | # in this "flutter" section. Each entry in this list should have a 76 | # "family" key with the font family name, and a "fonts" key with a 77 | # list giving the asset and other descriptors for the font. For 78 | # example: 79 | # fonts: 80 | # - family: Schyler 81 | # fonts: 82 | # - asset: fonts/Schyler-Regular.ttf 83 | # - asset: fonts/Schyler-Italic.ttf 84 | # style: italic 85 | # - family: Trajan Pro 86 | # fonts: 87 | # - asset: fonts/TrajanPro.ttf 88 | # - asset: fonts/TrajanPro_Bold.ttf 89 | # weight: 700 90 | # 91 | # For details regarding fonts from package dependencies, 92 | # see https://flutter.dev/custom-fonts/#from-packages 93 | -------------------------------------------------------------------------------- /example/test/widget_test.dart: -------------------------------------------------------------------------------- 1 | // This is a basic Flutter widget test. 2 | // 3 | // To perform an interaction with a widget in your test, use the WidgetTester 4 | // utility that Flutter provides. For example, you can send tap and scroll 5 | // gestures. You can also use WidgetTester to find child widgets in the widget 6 | // tree, read text, and verify that the values of widget properties are correct. 7 | 8 | import 'package:flutter/material.dart'; 9 | import 'package:flutter_test/flutter_test.dart'; 10 | 11 | import 'package:example/main.dart'; 12 | 13 | void main() { 14 | testWidgets('Counter increments smoke test', (WidgetTester tester) async { 15 | // Build our app and trigger a frame. 16 | await tester.pumpWidget(const MyApp()); 17 | 18 | // Verify that our counter starts at 0. 19 | expect(find.text('0'), findsOneWidget); 20 | expect(find.text('1'), findsNothing); 21 | 22 | // Tap the '+' icon and trigger a frame. 23 | await tester.tap(find.byIcon(Icons.add)); 24 | await tester.pump(); 25 | 26 | // Verify that our counter has incremented. 27 | expect(find.text('0'), findsNothing); 28 | expect(find.text('1'), findsOneWidget); 29 | }); 30 | } 31 | -------------------------------------------------------------------------------- /example/web/favicon.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Vadaski/flutter_exposure/ca1b6e81b7807c9855e59d054950032a07ca32a6/example/web/favicon.png -------------------------------------------------------------------------------- /example/web/icons/Icon-192.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Vadaski/flutter_exposure/ca1b6e81b7807c9855e59d054950032a07ca32a6/example/web/icons/Icon-192.png -------------------------------------------------------------------------------- /example/web/icons/Icon-512.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Vadaski/flutter_exposure/ca1b6e81b7807c9855e59d054950032a07ca32a6/example/web/icons/Icon-512.png -------------------------------------------------------------------------------- /example/web/icons/Icon-maskable-192.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Vadaski/flutter_exposure/ca1b6e81b7807c9855e59d054950032a07ca32a6/example/web/icons/Icon-maskable-192.png -------------------------------------------------------------------------------- /example/web/icons/Icon-maskable-512.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Vadaski/flutter_exposure/ca1b6e81b7807c9855e59d054950032a07ca32a6/example/web/icons/Icon-maskable-512.png -------------------------------------------------------------------------------- /example/web/index.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | example 30 | 31 | 32 | 33 | 36 | 100 | 101 | 102 | -------------------------------------------------------------------------------- /example/web/manifest.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "example", 3 | "short_name": "example", 4 | "start_url": ".", 5 | "display": "standalone", 6 | "background_color": "#0175C2", 7 | "theme_color": "#0175C2", 8 | "description": "A new Flutter project.", 9 | "orientation": "portrait-primary", 10 | "prefer_related_applications": false, 11 | "icons": [ 12 | { 13 | "src": "icons/Icon-192.png", 14 | "sizes": "192x192", 15 | "type": "image/png" 16 | }, 17 | { 18 | "src": "icons/Icon-512.png", 19 | "sizes": "512x512", 20 | "type": "image/png" 21 | }, 22 | { 23 | "src": "icons/Icon-maskable-192.png", 24 | "sizes": "192x192", 25 | "type": "image/png", 26 | "purpose": "maskable" 27 | }, 28 | { 29 | "src": "icons/Icon-maskable-512.png", 30 | "sizes": "512x512", 31 | "type": "image/png", 32 | "purpose": "maskable" 33 | } 34 | ] 35 | } 36 | -------------------------------------------------------------------------------- /lib/exposure.dart: -------------------------------------------------------------------------------- 1 | library exposure; 2 | 3 | export './src/exposure_widget.dart'; 4 | export './src/scroll_detail_provider.dart'; 5 | export './src/scroll_notification_publisher.dart'; 6 | -------------------------------------------------------------------------------- /lib/src/exposure_widget.dart: -------------------------------------------------------------------------------- 1 | import 'dart:async'; 2 | import 'dart:math'; 3 | 4 | import 'package:flutter/material.dart'; 5 | import 'package:flutter/rendering.dart'; 6 | 7 | import 'scroll_notification_publisher.dart'; 8 | 9 | enum ScrollState { visible, invisible } 10 | 11 | typedef OnHide = Function(Duration duration); 12 | 13 | // 控制曝光 14 | class Exposure extends StatefulWidget { 15 | const Exposure({ 16 | Key? key, 17 | required this.onExpose, 18 | required this.child, 19 | this.onHide, 20 | this.exposeFactor = 0.5, 21 | this.exposureController, 22 | this.exposureOnce = false, 23 | }) : super(key: key); 24 | 25 | /// onExpose will be called when widget is visible 26 | final VoidCallback onExpose; 27 | 28 | /// onHide will be called when widget is invisible 29 | final OnHide? onHide; 30 | 31 | /// widget need to be tracked 32 | final Widget child; 33 | 34 | /// exposeFactor is the factor of widget height or width 35 | /// depending on the direction of the scroll 36 | final double exposeFactor; 37 | 38 | /// to recheck if widget is visible 39 | final ExposureController? exposureController; 40 | 41 | /// if true, exposure will only call once 42 | final bool exposureOnce; 43 | 44 | @override 45 | State createState() => _ExposureState(); 46 | } 47 | 48 | class _ExposureState extends State { 49 | bool show = false; 50 | ScrollState state = ScrollState.invisible; 51 | DateTime? _exposeDate; 52 | double _scrollOffset = 0.0; 53 | Axis direction = Axis.vertical; 54 | late StreamSubscription _scrollNotificationSubscription; 55 | bool _subscribed = false; 56 | 57 | @override 58 | void initState() { 59 | WidgetsBinding.instance.addPostFrameCallback((timeStamp) { 60 | if (mounted) { 61 | subscribeScrollNotification(context); 62 | } 63 | }); 64 | widget.exposureController?._addState(this); 65 | super.initState(); 66 | } 67 | 68 | @override 69 | void dispose() { 70 | widget.exposureController?._removeState(this); 71 | _scrollNotificationSubscription.cancel(); 72 | super.dispose(); 73 | } 74 | 75 | @override 76 | Widget build(BuildContext context) { 77 | return widget.child; 78 | } 79 | 80 | void subscribeScrollNotification(BuildContext context) { 81 | if (_subscribed) { 82 | return; 83 | } 84 | final StreamController? publisher = 85 | ScrollNotificationPublisher.of(context); 86 | if (publisher == null) { 87 | throw FlutterError( 88 | 'Exposure widget must be a descendant of ScrollNotificationPublisher'); 89 | } 90 | _scrollNotificationSubscription = 91 | publisher.stream.listen((scrollNotification) { 92 | _scrollOffset = scrollNotification.metrics.pixels; 93 | direction = scrollNotification.metrics.axis; 94 | trackWidgetPosition(); 95 | }); 96 | } 97 | 98 | void trackWidgetPosition() { 99 | if (!mounted) { 100 | return; 101 | } 102 | final exposureOffset = getExposureOffset(context); 103 | final exposurePitSize = (context.findRenderObject() as RenderBox).size; 104 | final viewPortSize = getViewPortSize(context) ?? const Size(1, 1); 105 | if (direction == Axis.vertical) { 106 | checkExposure(exposureOffset, _scrollOffset, exposurePitSize.height, 107 | viewPortSize.height); 108 | } else { 109 | checkExposure(exposureOffset, _scrollOffset, exposurePitSize.width, 110 | viewPortSize.width); 111 | } 112 | } 113 | 114 | Size? getViewPortSize(BuildContext context) { 115 | final RenderObject? box = context.findRenderObject(); 116 | final RenderAbstractViewport? viewport = RenderAbstractViewport.of(box); 117 | final Size? size = viewport?.paintBounds.size; 118 | return size; 119 | } 120 | 121 | double getExposureOffset(BuildContext context) { 122 | final RenderObject? box = context.findRenderObject(); 123 | final RenderAbstractViewport? viewport = RenderAbstractViewport.of(box); 124 | 125 | if (viewport == null || box == null || !box.attached) { 126 | return 0.0; 127 | } 128 | 129 | final RevealedOffset offsetRevealToTop = 130 | viewport.getOffsetToReveal(box, 0.0, rect: Rect.zero); 131 | return offsetRevealToTop.offset; 132 | } 133 | 134 | void checkExposure(double exposureOffset, double scrollOffset, 135 | double currentSize, double viewPortSize) { 136 | final exposeFactor = min(max(widget.exposeFactor, 0.1), 0.9); 137 | bool becomeVisible = 138 | (exposureOffset + currentSize * (1 - exposeFactor)) > scrollOffset && 139 | (exposureOffset + currentSize * exposeFactor) < 140 | (scrollOffset + viewPortSize); 141 | 142 | bool becomeInvisible = 143 | (exposureOffset + currentSize * exposeFactor) < scrollOffset || 144 | (exposureOffset + (currentSize * (exposeFactor))) > 145 | scrollOffset + viewPortSize; 146 | 147 | if (state == ScrollState.invisible) { 148 | if (becomeVisible) { 149 | state = ScrollState.visible; 150 | widget.onExpose.call(); 151 | _recordExposeTime(); 152 | if (widget.exposureOnce) { 153 | _scrollNotificationSubscription.cancel(); 154 | } 155 | return; 156 | } 157 | } else { 158 | if (becomeInvisible) { 159 | state = ScrollState.invisible; 160 | _onHide(); 161 | return; 162 | } 163 | } 164 | } 165 | 166 | _recordExposeTime() { 167 | _exposeDate = DateTime.now(); 168 | } 169 | 170 | _onHide() { 171 | widget.onHide?.call(DateTime.now().difference(_exposeDate!)); 172 | } 173 | 174 | void reCheckExposeState() { 175 | state = ScrollState.invisible; 176 | show = false; 177 | _scrollNotificationSubscription.cancel(); 178 | subscribeScrollNotification(context); 179 | trackWidgetPosition(); 180 | } 181 | } 182 | 183 | class ExposureController { 184 | final List<_ExposureState> _states = []; 185 | 186 | void _addState(_ExposureState state) { 187 | _states.add(state); 188 | } 189 | 190 | void _removeState(_ExposureState state) { 191 | _states.remove(state); 192 | } 193 | 194 | void reCheckExposeState() { 195 | for (var _state in _states) { 196 | _state.reCheckExposeState(); 197 | } 198 | } 199 | } 200 | -------------------------------------------------------------------------------- /lib/src/scroll_detail_provider.dart: -------------------------------------------------------------------------------- 1 | import 'dart:async'; 2 | 3 | import 'package:flutter/material.dart'; 4 | import 'package:flutter_exposure/src/scroll_notification_publisher.dart'; 5 | 6 | class ScrollDetailProvider extends StatefulWidget { 7 | const ScrollDetailProvider({ 8 | Key? key, 9 | required this.child, 10 | this.lazy = false, 11 | }) : super(key: key); 12 | 13 | final Widget child; 14 | final bool lazy; 15 | 16 | @override 17 | _ScrollDetailProviderState createState() => _ScrollDetailProviderState(); 18 | } 19 | 20 | class _ScrollDetailProviderState extends State 21 | with AutomaticKeepAliveClientMixin { 22 | bool initialed = false; 23 | StreamController scrollNotificationController = 24 | StreamController.broadcast(); 25 | 26 | @override 27 | Widget build(BuildContext context) { 28 | super.build(context); 29 | return ScrollNotificationPublisher( 30 | scrollNotificationController: scrollNotificationController, 31 | child: Builder(builder: (context) { 32 | if (!initialed) { 33 | postStartPosition(context); 34 | initialed = true; 35 | } 36 | return buildNotificationWidget(context, widget.child); 37 | }), 38 | ); 39 | } 40 | 41 | Widget buildNotificationWidget(BuildContext context, Widget child) { 42 | if (widget.lazy) { 43 | return NotificationListener( 44 | onNotification: (scrollNotification) { 45 | return postNotification(scrollNotification, context); 46 | }, 47 | child: widget.child, 48 | ); 49 | } 50 | return NotificationListener( 51 | onNotification: (scrollNotification) { 52 | return postNotification(scrollNotification, context); 53 | }, 54 | child: child, 55 | ); 56 | } 57 | 58 | bool postNotification(ScrollNotification notification, BuildContext context) { 59 | scrollNotificationController.add(notification); 60 | return false; 61 | } 62 | 63 | // 首次展现需要单独发一个 Notification 64 | // pixels 为 0 65 | // 为了避免 listener 还没有监听上从而丢失第一次消息，延迟 500 ms 66 | void postStartPosition(BuildContext context) async { 67 | await Future.delayed(const Duration(microseconds: 500)); 68 | final fakeScrollNotification = ScrollStartNotification( 69 | context: context, 70 | metrics: FixedScrollMetrics( 71 | minScrollExtent: 0.0, 72 | maxScrollExtent: 0.0, 73 | pixels: 0.0, 74 | viewportDimension: 0.0, 75 | axisDirection: AxisDirection.down, 76 | devicePixelRatio: 1.0, 77 | ), 78 | ); 79 | postNotification(fakeScrollNotification, context); 80 | } 81 | 82 | @override 83 | bool get wantKeepAlive => true; 84 | } 85 | -------------------------------------------------------------------------------- /lib/src/scroll_notification_publisher.dart: -------------------------------------------------------------------------------- 1 | import 'dart:async'; 2 | 3 | import 'package:flutter/material.dart'; 4 | 5 | // 共享滑动信息 6 | class ScrollNotificationPublisher extends InheritedWidget { 7 | const ScrollNotificationPublisher( 8 | {Key? key, 9 | required Widget child, 10 | required this.scrollNotificationController}) 11 | : super(key: key, child: child); 12 | 13 | final StreamController scrollNotificationController; 14 | 15 | @override 16 | bool updateShouldNotify(covariant InheritedWidget oldWidget) { 17 | return false; 18 | } 19 | 20 | static StreamController? of(BuildContext context) { 21 | return context 22 | .dependOnInheritedWidgetOfExactType() 23 | ?.scrollNotificationController; 24 | } 25 | } 26 | -------------------------------------------------------------------------------- /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 | sha256: "947bfcf187f74dbc5e146c9eb9c0f10c9f8b30743e341481c1e2ed3ecc18c20c" 9 | url: "https://pub.dev" 10 | source: hosted 11 | version: "2.11.0" 12 | boolean_selector: 13 | dependency: transitive 14 | description: 15 | name: boolean_selector 16 | sha256: "6cfb5af12253eaf2b368f07bacc5a80d1301a071c73360d746b7f2e32d762c66" 17 | url: "https://pub.dev" 18 | source: hosted 19 | version: "2.1.1" 20 | characters: 21 | dependency: transitive 22 | description: 23 | name: characters 24 | sha256: "04a925763edad70e8443c99234dc3328f442e811f1d8fd1a72f1c8ad0f69a605" 25 | url: "https://pub.dev" 26 | source: hosted 27 | version: "1.3.0" 28 | clock: 29 | dependency: transitive 30 | description: 31 | name: clock 32 | sha256: cb6d7f03e1de671e34607e909a7213e31d7752be4fb66a86d29fe1eb14bfb5cf 33 | url: "https://pub.dev" 34 | source: hosted 35 | version: "1.1.1" 36 | collection: 37 | dependency: transitive 38 | description: 39 | name: collection 40 | sha256: "4a07be6cb69c84d677a6c3096fcf960cc3285a8330b4603e0d463d15d9bd934c" 41 | url: "https://pub.dev" 42 | source: hosted 43 | version: "1.17.1" 44 | fake_async: 45 | dependency: transitive 46 | description: 47 | name: fake_async 48 | sha256: "511392330127add0b769b75a987850d136345d9227c6b94c96a04cf4a391bf78" 49 | url: "https://pub.dev" 50 | source: hosted 51 | version: "1.3.1" 52 | flutter: 53 | dependency: "direct main" 54 | description: flutter 55 | source: sdk 56 | version: "0.0.0" 57 | flutter_lints: 58 | dependency: "direct dev" 59 | description: 60 | name: flutter_lints 61 | sha256: b543301ad291598523947dc534aaddc5aaad597b709d2426d3a0e0d44c5cb493 62 | url: "https://pub.dev" 63 | source: hosted 64 | version: "1.0.4" 65 | flutter_test: 66 | dependency: "direct dev" 67 | description: flutter 68 | source: sdk 69 | version: "0.0.0" 70 | js: 71 | dependency: transitive 72 | description: 73 | name: js 74 | sha256: f2c445dce49627136094980615a031419f7f3eb393237e4ecd97ac15dea343f3 75 | url: "https://pub.dev" 76 | source: hosted 77 | version: "0.6.7" 78 | lints: 79 | dependency: transitive 80 | description: 81 | name: lints 82 | sha256: a2c3d198cb5ea2e179926622d433331d8b58374ab8f29cdda6e863bd62fd369c 83 | url: "https://pub.dev" 84 | source: hosted 85 | version: "1.0.1" 86 | matcher: 87 | dependency: transitive 88 | description: 89 | name: matcher 90 | sha256: "6501fbd55da300384b768785b83e5ce66991266cec21af89ab9ae7f5ce1c4cbb" 91 | url: "https://pub.dev" 92 | source: hosted 93 | version: "0.12.15" 94 | material_color_utilities: 95 | dependency: transitive 96 | description: 97 | name: material_color_utilities 98 | sha256: d92141dc6fe1dad30722f9aa826c7fbc896d021d792f80678280601aff8cf724 99 | url: "https://pub.dev" 100 | source: hosted 101 | version: "0.2.0" 102 | meta: 103 | dependency: transitive 104 | description: 105 | name: meta 106 | sha256: "3c74dbf8763d36539f114c799d8a2d87343b5067e9d796ca22b5eb8437090ee3" 107 | url: "https://pub.dev" 108 | source: hosted 109 | version: "1.9.1" 110 | path: 111 | dependency: transitive 112 | description: 113 | name: path 114 | sha256: "8829d8a55c13fc0e37127c29fedf290c102f4e40ae94ada574091fe0ff96c917" 115 | url: "https://pub.dev" 116 | source: hosted 117 | version: "1.8.3" 118 | sky_engine: 119 | dependency: transitive 120 | description: flutter 121 | source: sdk 122 | version: "0.0.99" 123 | source_span: 124 | dependency: transitive 125 | description: 126 | name: source_span 127 | sha256: dd904f795d4b4f3b870833847c461801f6750a9fa8e61ea5ac53f9422b31f250 128 | url: "https://pub.dev" 129 | source: hosted 130 | version: "1.9.1" 131 | stack_trace: 132 | dependency: transitive 133 | description: 134 | name: stack_trace 135 | sha256: c3c7d8edb15bee7f0f74debd4b9c5f3c2ea86766fe4178eb2a18eb30a0bdaed5 136 | url: "https://pub.dev" 137 | source: hosted 138 | version: "1.11.0" 139 | stream_channel: 140 | dependency: transitive 141 | description: 142 | name: stream_channel 143 | sha256: "83615bee9045c1d322bbbd1ba209b7a749c2cbcdcb3fdd1df8eb488b3279c1c8" 144 | url: "https://pub.dev" 145 | source: hosted 146 | version: "2.1.1" 147 | string_scanner: 148 | dependency: transitive 149 | description: 150 | name: string_scanner 151 | sha256: "556692adab6cfa87322a115640c11f13cb77b3f076ddcc5d6ae3c20242bedcde" 152 | url: "https://pub.dev" 153 | source: hosted 154 | version: "1.2.0" 155 | term_glyph: 156 | dependency: transitive 157 | description: 158 | name: term_glyph 159 | sha256: a29248a84fbb7c79282b40b8c72a1209db169a2e0542bce341da992fe1bc7e84 160 | url: "https://pub.dev" 161 | source: hosted 162 | version: "1.2.1" 163 | test_api: 164 | dependency: transitive 165 | description: 166 | name: test_api 167 | sha256: eb6ac1540b26de412b3403a163d919ba86f6a973fe6cc50ae3541b80092fdcfb 168 | url: "https://pub.dev" 169 | source: hosted 170 | version: "0.5.1" 171 | vector_math: 172 | dependency: transitive 173 | description: 174 | name: vector_math 175 | sha256: "80b3257d1492ce4d091729e3a67a60407d227c27241d6927be0130c98e741803" 176 | url: "https://pub.dev" 177 | source: hosted 178 | version: "2.1.4" 179 | sdks: 180 | dart: ">=3.0.0-0 <4.0.0" 181 | -------------------------------------------------------------------------------- /pubspec.yaml: -------------------------------------------------------------------------------- 1 | name: flutter_exposure 2 | description: A Flutter scrollable widget buried exposure tool. 3 | version: 0.0.4 4 | homepage: https://github.com/Vadaski/flutter_exposure/ 5 | 6 | environment: 7 | sdk: '>=2.18.0 <3.0.0' 8 | 9 | dependencies: 10 | flutter: 11 | sdk: flutter 12 | 13 | dev_dependencies: 14 | flutter_test: 15 | sdk: flutter 16 | flutter_lints: ^1.0.0 17 | 18 | flutter: 19 | -------------------------------------------------------------------------------- /test/exposure_test.dart: -------------------------------------------------------------------------------- 1 | void main() { 2 | // test('adds one to input values', () { 3 | // final calculator = Calculator(); 4 | // expect(calculator.addOne(2), 3); 5 | // expect(calculator.addOne(-7), -6); 6 | // expect(calculator.addOne(0), 1); 7 | // }); 8 | } 9 | --------------------------------------------------------------------------------