diff --git a/.github/dependabot.yaml b/.github/dependabot.yaml
new file mode 100644
index 0000000..39bd9ac
--- /dev/null
+++ b/.github/dependabot.yaml
@@ -0,0 +1,7 @@
+version: 2
+enable-beta-ecosystems: true
+updates:
+ - package-ecosystem: "pub"
+ directory: "/"
+ schedule:
+ interval: "weekly"
\ No newline at end of file
diff --git a/.github/workflows/pull_request.yaml b/.github/workflows/pull_request.yaml
new file mode 100644
index 0000000..0153fa9
--- /dev/null
+++ b/.github/workflows/pull_request.yaml
@@ -0,0 +1,24 @@
+name: pull_request
+
+on:
+ pull_request:
+ branches:
+ - main
+
+jobs:
+ format:
+ runs-on: ubuntu-latest
+ timeout-minutes: 30
+ steps:
+ - name: 'Git Checkout'
+ uses: actions/checkout@v3
+ - name: 'Install Flutter'
+ uses: subosito/flutter-action@v2
+ with:
+ channel: 'stable'
+ - name: 'Install Tools'
+ run: flutter pub global activate fvm; make init;
+ - name: 'Format Code'
+ run: make fix
+ - name: 'Validate Formatting'
+ run: ./tool/validate-formatting.sh
\ No newline at end of file
diff --git a/.github/workflows/push.yaml b/.github/workflows/push.yaml
new file mode 100644
index 0000000..702cbb1
--- /dev/null
+++ b/.github/workflows/push.yaml
@@ -0,0 +1,17 @@
+name: push
+
+on:
+ push:
+ branches:
+ - main
+
+jobs:
+ build:
+ runs-on: ubuntu-latest
+ steps:
+ - uses: actions/checkout@v2
+ - uses: jacopocarlini/action-autotag@master
+ with:
+ GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
+ package_root: "/"
+ tag_prefix: "v"
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..5850b3f
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,32 @@
+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+migrate_working_dir/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+.vscode/
+
+# Flutter/Dart/Pub related
+# Libraries should not include pubspec.lock, per https://dart.dev/guides/libraries/private-files#pubspeclock.
+/pubspec.lock
+**/doc/api/
+.dart_tool/
+build/
+.flutter-plugins
+.flutter-plugins-dependencies
+
+# FVM
+.fvm/
+.fvmrc
diff --git a/.metadata b/.metadata
new file mode 100644
index 0000000..7344f88
--- /dev/null
+++ b/.metadata
@@ -0,0 +1,10 @@
+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+ revision: "db7ef5bf9f59442b0e200a90587e8fa5e0c6336a"
+ channel: "stable"
+
+project_type: package
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..0d8803f
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,3 @@
+## 1.0.0
+
+* Initial release.
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..8012737
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,50 @@
+.PHONY: version doctor
+
+PANA_SCRIPT = ./tool/verify_pub_score.sh 100
+VALIDATE_SCRIPT = ./tool/validate-formatting.sh
+BUMPV_VERSION_SCRIPT = ./tool/bump-version.sh
+
+EXAMPLE_PATH = example
+
+FVM = fvm
+FVM_FLUTTER = $(FVM) flutter
+DART = dart
+FVM_DART = $(FVM) ${DART}
+
+
+init:
+ make activate_fvm; $(FVM) use 3.24.3 --force; $(FVM_DART) pub global activate pana;
+
+activate_fvm:
+ ${DART} pub global activate ${FVM}
+
+version:
+ $(FVM_FLUTTER) --version; $(FVM_DART) --version;
+
+doctor:
+ $(FVM_FLUTTER) doctor;
+
+ifeq (bump, $(firstword $(MAKECMDGOALS)))
+ runargs := $(wordlist 2, $(words $(MAKECMDGOALS)), $(MAKECMDGOALS))
+ $(eval $(runargs):;@true)
+endif
+bump:
+ ./tool/bump-version.sh $(filter-out $@,$(MAKECMDGOALS))
+
+pub_get:
+ $(FVM_FLUTTER) packages get;
+
+clean:
+ $(FVM_FLUTTER) clean;
+
+fix:
+ $(FVM_DART) format .;
+
+analyze:
+ $(FVM_FLUTTER) analyze . --fatal-infos;
+
+pana:
+ $(PANA_SCRIPT);
+
+validate:
+ $(VALIDATE_SCRIPT)
\ No newline at end of file
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..f3ec078
--- /dev/null
+++ b/README.md
@@ -0,0 +1,100 @@
+# gravity_box
+
+A Flutter library that provides a GravityBox widget for simulating gravity inside of it.
+
+This widget uses the [GravitySensor](https://pub.dev/packages/gravity_sensor) package to get the device's gravity sensor data.
+
+## Features
+
+- **Gravity Simulation**: Simulate gravity for widgets using the `GravityBox` widget.
+- **Collision Detection**: Simple collision system between `GravityObject` and other children widgets.
+
+## Usage
+
+Import the package
+
+```dart
+import 'package:gravity_box/gravity_box.dart';
+```
+
+
+Use the widget.
+
+```dart
+GravityBox(
+ gravityObjects: [
+ GravityObject(
+ size: 100,
+ widget: Container(
+ width: 42,
+ height: 42,
+ color: Colors.purple,
+ ),
+ ),
+ ],
+);
+```
+
+
+Provide a list of `GravityObject`s to the `gravityObjects` property. The `GravityBox` will automatically update the `GravityObject`s position and velocity based on the device's gravity sensor data.\
+The `size` used to calculate bounding box of the object. Keep in mind that the size of the object is not the same as the size of the widget.\
+The `position` is the top-left corner of the object in the `GravityBox` coordinate system (its layout contraints).\
+If you want to add rolling ability (e.g. for circle-shaped widgets), set `canRoll: true` in the `GravityObject`.\
+The `angle` is the current rotation degrees of the object.\
+The `widget` is the widget that will be displayed as the object.\
+
+```dart
+GravityBox(
+ gravityObjects: [
+ GravityObject(
+ size: 100,
+ position: Vector2(50, 100),
+ canRoll: true,
+ angle: 90,
+ widget: Container(
+ width: 42,
+ height: 42,
+ color: Colors.purple,
+ ),
+ ),
+ ],
+);
+```
+
+
+To display debug info for the `GravityObject`, such as its position and borders, set `debugShowObjectsPosition: true` in the `GravityBox`.
+
+```dart
+GravityBox(
+ debugShowObjectsPosition: true,
+ gravityObjects: [
+ GravityObject(
+ child: Container(
+ width: 42,
+ height: 42,
+ color: Colors.purple,
+ ),
+ ),
+ ],
+);
+```
+
+
+To display additional widgets in `GravityBox`, provide them in the `children` property if you want them to collide with `GravityObject`s and in the `notCollidableChildren` property if you want them to not collide with `GravityObject`s.
+
+```dart
+const GravityBox(
+ notCollidableChildren: [
+ Positioned.fill(
+ child: ColoredBox(color: Color(0x80000000)),
+ ),
+ ],
+ children: [FlutterLogo()],
+ );
+```
+
+## Example
+
+See full [Example][example] in the corresponding folder
+
+[example]: https://github.com/MadBrains/Gravity-Box-Flutter/tree/main/example
diff --git a/analysis_options.yaml b/analysis_options.yaml
new file mode 100644
index 0000000..a5744c1
--- /dev/null
+++ b/analysis_options.yaml
@@ -0,0 +1,4 @@
+include: package:flutter_lints/flutter.yaml
+
+# Additional information about this file can be found at
+# https://dart.dev/guides/language/analysis-options
diff --git a/example/.gitignore b/example/.gitignore
new file mode 100644
index 0000000..7aa453c
--- /dev/null
+++ b/example/.gitignore
@@ -0,0 +1,44 @@
+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+migrate_working_dir/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+#.vscode/
+
+# Flutter/Dart/Pub related
+/pubspec.lock
+**/doc/api/
+**/ios/Flutter/.last_build_id
+.dart_tool/
+.flutter-plugins
+.flutter-plugins-dependencies
+.pub-cache/
+.pub/
+/build/
+
+# Symbolication related
+app.*.symbols
+
+# Obfuscation related
+app.*.map.json
+
+# Android Studio will place build artifacts here
+/android/app/debug
+/android/app/profile
+/android/app/release
diff --git a/example/.metadata b/example/.metadata
new file mode 100644
index 0000000..8ca14df
--- /dev/null
+++ b/example/.metadata
@@ -0,0 +1,45 @@
+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+ revision: "5dcb86f68f239346676ceb1ed1ea385bd215fba1"
+ channel: "stable"
+
+project_type: app
+
+# Tracks metadata for the flutter migrate command
+migration:
+ platforms:
+ - platform: root
+ create_revision: 5dcb86f68f239346676ceb1ed1ea385bd215fba1
+ base_revision: 5dcb86f68f239346676ceb1ed1ea385bd215fba1
+ - platform: android
+ create_revision: 5dcb86f68f239346676ceb1ed1ea385bd215fba1
+ base_revision: 5dcb86f68f239346676ceb1ed1ea385bd215fba1
+ - platform: ios
+ create_revision: 5dcb86f68f239346676ceb1ed1ea385bd215fba1
+ base_revision: 5dcb86f68f239346676ceb1ed1ea385bd215fba1
+ - platform: linux
+ create_revision: 5dcb86f68f239346676ceb1ed1ea385bd215fba1
+ base_revision: 5dcb86f68f239346676ceb1ed1ea385bd215fba1
+ - platform: macos
+ create_revision: 5dcb86f68f239346676ceb1ed1ea385bd215fba1
+ base_revision: 5dcb86f68f239346676ceb1ed1ea385bd215fba1
+ - platform: web
+ create_revision: 5dcb86f68f239346676ceb1ed1ea385bd215fba1
+ base_revision: 5dcb86f68f239346676ceb1ed1ea385bd215fba1
+ - platform: windows
+ create_revision: 5dcb86f68f239346676ceb1ed1ea385bd215fba1
+ base_revision: 5dcb86f68f239346676ceb1ed1ea385bd215fba1
+
+ # User provided section
+
+ # List of Local paths (relative to this file) that should be
+ # ignored by the migrate tool.
+ #
+ # Files that are not part of the templates will be ignored by default.
+ unmanaged_files:
+ - 'lib/main.dart'
+ - 'ios/Runner.xcodeproj/project.pbxproj'
diff --git a/example/README.md b/example/README.md
new file mode 100644
index 0000000..1b7a4e3
--- /dev/null
+++ b/example/README.md
@@ -0,0 +1,3 @@
+# example
+
+A new Flutter project.
diff --git a/example/analysis_options.yaml b/example/analysis_options.yaml
new file mode 100644
index 0000000..f9b3034
--- /dev/null
+++ b/example/analysis_options.yaml
@@ -0,0 +1 @@
+include: package:flutter_lints/flutter.yaml
diff --git a/example/android/.gitignore b/example/android/.gitignore
new file mode 100644
index 0000000..6f56801
--- /dev/null
+++ b/example/android/.gitignore
@@ -0,0 +1,13 @@
+gradle-wrapper.jar
+/.gradle
+/captures/
+/gradlew
+/gradlew.bat
+/local.properties
+GeneratedPluginRegistrant.java
+
+# Remember to never publicly share your keystore.
+# See https://flutter.dev/docs/deployment/android#reference-the-keystore-from-the-app
+key.properties
+**/*.keystore
+**/*.jks
diff --git a/example/android/app/build.gradle b/example/android/app/build.gradle
new file mode 100644
index 0000000..09d53b7
--- /dev/null
+++ b/example/android/app/build.gradle
@@ -0,0 +1,57 @@
+plugins {
+ id "com.android.application"
+ id "kotlin-android"
+ // The Flutter Gradle Plugin must be applied after the Android and Kotlin Gradle plugins.
+ id "dev.flutter.flutter-gradle-plugin"
+}
+
+def localProperties = new Properties()
+def localPropertiesFile = rootProject.file("local.properties")
+if (localPropertiesFile.exists()) {
+ localPropertiesFile.withReader("UTF-8") { reader ->
+ localProperties.load(reader)
+ }
+}
+
+def flutterVersionCode = localProperties.getProperty("flutter.versionCode")
+if (flutterVersionCode == null) {
+ flutterVersionCode = "1"
+}
+
+def flutterVersionName = localProperties.getProperty("flutter.versionName")
+if (flutterVersionName == null) {
+ flutterVersionName = "1.0"
+}
+
+android {
+ namespace = "ru.madbrains.gravity_box_example"
+ compileSdk = flutter.compileSdkVersion
+ ndkVersion = flutter.ndkVersion
+
+ compileOptions {
+ sourceCompatibility = JavaVersion.VERSION_1_8
+ targetCompatibility = JavaVersion.VERSION_1_8
+ }
+
+ defaultConfig {
+ applicationId = "ru.madbrains.gravity_box_example"
+ // You can update the following values to match your application needs.
+ // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration.
+ minSdk = flutter.minSdkVersion
+ targetSdk = flutter.targetSdkVersion
+ versionCode = flutterVersionCode.toInteger()
+ versionName = flutterVersionName
+ }
+
+ buildTypes {
+ release {
+ // TODO: Add your own signing config for the release build.
+ // Signing with the debug keys for now, so `flutter run --release` works.
+ signingConfig = signingConfigs.debug
+ }
+ }
+}
+
+flutter {
+ source = "../.."
+}
diff --git a/example/android/app/src/debug/AndroidManifest.xml b/example/android/app/src/debug/AndroidManifest.xml
new file mode 100644
index 0000000..399f698
--- /dev/null
+++ b/example/android/app/src/debug/AndroidManifest.xml
@@ -0,0 +1,7 @@
+
+
+
+
diff --git a/example/android/app/src/main/AndroidManifest.xml b/example/android/app/src/main/AndroidManifest.xml
new file mode 100644
index 0000000..5509f85
--- /dev/null
+++ b/example/android/app/src/main/AndroidManifest.xml
@@ -0,0 +1,45 @@
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/example/android/app/src/main/kotlin/ru/madbrains/gravity_box_example/MainActivity.kt b/example/android/app/src/main/kotlin/ru/madbrains/gravity_box_example/MainActivity.kt
new file mode 100644
index 0000000..ce734c7
--- /dev/null
+++ b/example/android/app/src/main/kotlin/ru/madbrains/gravity_box_example/MainActivity.kt
@@ -0,0 +1,5 @@
+package ru.madbrains.gravity_box_example
+
+import io.flutter.embedding.android.FlutterActivity
+
+class MainActivity: FlutterActivity()
diff --git a/example/android/app/src/main/res/drawable-v21/launch_background.xml b/example/android/app/src/main/res/drawable-v21/launch_background.xml
new file mode 100644
index 0000000..f74085f
--- /dev/null
+++ b/example/android/app/src/main/res/drawable-v21/launch_background.xml
@@ -0,0 +1,12 @@
+
+
+
+
+
+
+
+
diff --git a/example/android/app/src/main/res/drawable/launch_background.xml b/example/android/app/src/main/res/drawable/launch_background.xml
new file mode 100644
index 0000000..304732f
--- /dev/null
+++ b/example/android/app/src/main/res/drawable/launch_background.xml
@@ -0,0 +1,12 @@
+
+
+
+
+
+
+
+
diff --git a/example/android/app/src/main/res/mipmap-hdpi/ic_launcher.png b/example/android/app/src/main/res/mipmap-hdpi/ic_launcher.png
new file mode 100644
index 0000000..db77bb4
Binary files /dev/null and b/example/android/app/src/main/res/mipmap-hdpi/ic_launcher.png differ
diff --git a/example/android/app/src/main/res/mipmap-mdpi/ic_launcher.png b/example/android/app/src/main/res/mipmap-mdpi/ic_launcher.png
new file mode 100644
index 0000000..17987b7
Binary files /dev/null and b/example/android/app/src/main/res/mipmap-mdpi/ic_launcher.png differ
diff --git a/example/android/app/src/main/res/mipmap-xhdpi/ic_launcher.png b/example/android/app/src/main/res/mipmap-xhdpi/ic_launcher.png
new file mode 100644
index 0000000..09d4391
Binary files /dev/null and b/example/android/app/src/main/res/mipmap-xhdpi/ic_launcher.png differ
diff --git a/example/android/app/src/main/res/mipmap-xxhdpi/ic_launcher.png b/example/android/app/src/main/res/mipmap-xxhdpi/ic_launcher.png
new file mode 100644
index 0000000..d5f1c8d
Binary files /dev/null and b/example/android/app/src/main/res/mipmap-xxhdpi/ic_launcher.png differ
diff --git a/example/android/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png b/example/android/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png
new file mode 100644
index 0000000..4d6372e
Binary files /dev/null and b/example/android/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png differ
diff --git a/example/android/app/src/main/res/values-night/styles.xml b/example/android/app/src/main/res/values-night/styles.xml
new file mode 100644
index 0000000..06952be
--- /dev/null
+++ b/example/android/app/src/main/res/values-night/styles.xml
@@ -0,0 +1,18 @@
+
+
+
+
+
+
+
diff --git a/example/android/app/src/main/res/values/styles.xml b/example/android/app/src/main/res/values/styles.xml
new file mode 100644
index 0000000..cb1ef88
--- /dev/null
+++ b/example/android/app/src/main/res/values/styles.xml
@@ -0,0 +1,18 @@
+
+
+
+
+
+
+
diff --git a/example/android/app/src/profile/AndroidManifest.xml b/example/android/app/src/profile/AndroidManifest.xml
new file mode 100644
index 0000000..399f698
--- /dev/null
+++ b/example/android/app/src/profile/AndroidManifest.xml
@@ -0,0 +1,7 @@
+
+
+
+
diff --git a/example/android/build.gradle b/example/android/build.gradle
new file mode 100644
index 0000000..d2ffbff
--- /dev/null
+++ b/example/android/build.gradle
@@ -0,0 +1,18 @@
+allprojects {
+ repositories {
+ google()
+ mavenCentral()
+ }
+}
+
+rootProject.buildDir = "../build"
+subprojects {
+ project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
+ project.evaluationDependsOn(":app")
+}
+
+tasks.register("clean", Delete) {
+ delete rootProject.buildDir
+}
diff --git a/example/android/gradle.properties b/example/android/gradle.properties
new file mode 100644
index 0000000..3b5b324
--- /dev/null
+++ b/example/android/gradle.properties
@@ -0,0 +1,3 @@
+org.gradle.jvmargs=-Xmx4G -XX:+HeapDumpOnOutOfMemoryError
+android.useAndroidX=true
+android.enableJetifier=true
diff --git a/example/android/gradle/wrapper/gradle-wrapper.properties b/example/android/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..e1ca574
--- /dev/null
+++ b/example/android/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.6.3-all.zip
diff --git a/example/android/settings.gradle b/example/android/settings.gradle
new file mode 100644
index 0000000..536165d
--- /dev/null
+++ b/example/android/settings.gradle
@@ -0,0 +1,25 @@
+pluginManagement {
+ def flutterSdkPath = {
+ def properties = new Properties()
+ file("local.properties").withInputStream { properties.load(it) }
+ def flutterSdkPath = properties.getProperty("flutter.sdk")
+ assert flutterSdkPath != null, "flutter.sdk not set in local.properties"
+ return flutterSdkPath
+ }()
+
+ includeBuild("$flutterSdkPath/packages/flutter_tools/gradle")
+
+ repositories {
+ google()
+ mavenCentral()
+ gradlePluginPortal()
+ }
+}
+
+plugins {
+ id "dev.flutter.flutter-plugin-loader" version "1.0.0"
+ id "com.android.application" version "7.3.0" apply false
+ id "org.jetbrains.kotlin.android" version "1.7.10" apply false
+}
+
+include ":app"
diff --git a/example/ios/.gitignore b/example/ios/.gitignore
new file mode 100644
index 0000000..7a7f987
--- /dev/null
+++ b/example/ios/.gitignore
@@ -0,0 +1,34 @@
+**/dgph
+*.mode1v3
+*.mode2v3
+*.moved-aside
+*.pbxuser
+*.perspectivev3
+**/*sync/
+.sconsign.dblite
+.tags*
+**/.vagrant/
+**/DerivedData/
+Icon?
+**/Pods/
+**/.symlinks/
+profile
+xcuserdata
+**/.generated/
+Flutter/App.framework
+Flutter/Flutter.framework
+Flutter/Flutter.podspec
+Flutter/Generated.xcconfig
+Flutter/ephemeral/
+Flutter/app.flx
+Flutter/app.zip
+Flutter/flutter_assets/
+Flutter/flutter_export_environment.sh
+ServiceDefinitions.json
+Runner/GeneratedPluginRegistrant.*
+
+# Exceptions to above rules.
+!default.mode1v3
+!default.mode2v3
+!default.pbxuser
+!default.perspectivev3
diff --git a/example/ios/Flutter/AppFrameworkInfo.plist b/example/ios/Flutter/AppFrameworkInfo.plist
new file mode 100644
index 0000000..7c56964
--- /dev/null
+++ b/example/ios/Flutter/AppFrameworkInfo.plist
@@ -0,0 +1,26 @@
+
+
+
+
+ CFBundleDevelopmentRegion
+ en
+ CFBundleExecutable
+ App
+ CFBundleIdentifier
+ io.flutter.flutter.app
+ CFBundleInfoDictionaryVersion
+ 6.0
+ CFBundleName
+ App
+ CFBundlePackageType
+ FMWK
+ CFBundleShortVersionString
+ 1.0
+ CFBundleSignature
+ ????
+ CFBundleVersion
+ 1.0
+ MinimumOSVersion
+ 12.0
+
+
diff --git a/example/ios/Flutter/Debug.xcconfig b/example/ios/Flutter/Debug.xcconfig
new file mode 100644
index 0000000..ec97fc6
--- /dev/null
+++ b/example/ios/Flutter/Debug.xcconfig
@@ -0,0 +1,2 @@
+#include? "Pods/Target Support Files/Pods-Runner/Pods-Runner.debug.xcconfig"
+#include "Generated.xcconfig"
diff --git a/example/ios/Flutter/Release.xcconfig b/example/ios/Flutter/Release.xcconfig
new file mode 100644
index 0000000..c4855bf
--- /dev/null
+++ b/example/ios/Flutter/Release.xcconfig
@@ -0,0 +1,2 @@
+#include? "Pods/Target Support Files/Pods-Runner/Pods-Runner.release.xcconfig"
+#include "Generated.xcconfig"
diff --git a/example/ios/Podfile b/example/ios/Podfile
new file mode 100644
index 0000000..d97f17e
--- /dev/null
+++ b/example/ios/Podfile
@@ -0,0 +1,44 @@
+# Uncomment this line to define a global platform for your project
+# platform :ios, '12.0'
+
+# CocoaPods analytics sends network stats synchronously affecting flutter build latency.
+ENV['COCOAPODS_DISABLE_STATS'] = 'true'
+
+project 'Runner', {
+ 'Debug' => :debug,
+ 'Profile' => :release,
+ 'Release' => :release,
+}
+
+def flutter_root
+ generated_xcode_build_settings_path = File.expand_path(File.join('..', 'Flutter', 'Generated.xcconfig'), __FILE__)
+ unless File.exist?(generated_xcode_build_settings_path)
+ raise "#{generated_xcode_build_settings_path} must exist. If you're running pod install manually, make sure flutter pub get is executed first"
+ end
+
+ File.foreach(generated_xcode_build_settings_path) do |line|
+ matches = line.match(/FLUTTER_ROOT\=(.*)/)
+ return matches[1].strip if matches
+ end
+ raise "FLUTTER_ROOT not found in #{generated_xcode_build_settings_path}. Try deleting Generated.xcconfig, then run flutter pub get"
+end
+
+require File.expand_path(File.join('packages', 'flutter_tools', 'bin', 'podhelper'), flutter_root)
+
+flutter_ios_podfile_setup
+
+target 'Runner' do
+ use_frameworks!
+ use_modular_headers!
+
+ flutter_install_all_ios_pods File.dirname(File.realpath(__FILE__))
+ target 'RunnerTests' do
+ inherit! :search_paths
+ end
+end
+
+post_install do |installer|
+ installer.pods_project.targets.each do |target|
+ flutter_additional_ios_build_settings(target)
+ end
+end
diff --git a/example/ios/Podfile.lock b/example/ios/Podfile.lock
new file mode 100644
index 0000000..b6a700b
--- /dev/null
+++ b/example/ios/Podfile.lock
@@ -0,0 +1,22 @@
+PODS:
+ - Flutter (1.0.0)
+ - gravity_sensor (0.0.1):
+ - Flutter
+
+DEPENDENCIES:
+ - Flutter (from `Flutter`)
+ - gravity_sensor (from `.symlinks/plugins/gravity_sensor/ios`)
+
+EXTERNAL SOURCES:
+ Flutter:
+ :path: Flutter
+ gravity_sensor:
+ :path: ".symlinks/plugins/gravity_sensor/ios"
+
+SPEC CHECKSUMS:
+ Flutter: e0871f40cf51350855a761d2e70bf5af5b9b5de7
+ gravity_sensor: 415641c53c754ff803efcca7dce48ce63957f089
+
+PODFILE CHECKSUM: 819463e6a0290f5a72f145ba7cde16e8b6ef0796
+
+COCOAPODS: 1.15.2
diff --git a/example/ios/Runner.xcodeproj/project.pbxproj b/example/ios/Runner.xcodeproj/project.pbxproj
new file mode 100644
index 0000000..31e849d
--- /dev/null
+++ b/example/ios/Runner.xcodeproj/project.pbxproj
@@ -0,0 +1,728 @@
+// !$*UTF8*$!
+{
+ archiveVersion = 1;
+ classes = {
+ };
+ objectVersion = 54;
+ objects = {
+
+/* Begin PBXBuildFile section */
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+}
diff --git a/example/ios/Runner.xcodeproj/project.xcworkspace/contents.xcworkspacedata b/example/ios/Runner.xcodeproj/project.xcworkspace/contents.xcworkspacedata
new file mode 100644
index 0000000..919434a
--- /dev/null
+++ b/example/ios/Runner.xcodeproj/project.xcworkspace/contents.xcworkspacedata
@@ -0,0 +1,7 @@
+
+
+
+
+
diff --git a/example/ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist b/example/ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
new file mode 100644
index 0000000..18d9810
--- /dev/null
+++ b/example/ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
@@ -0,0 +1,8 @@
+
+
+
+
+ IDEDidComputeMac32BitWarning
+
+
+
diff --git a/example/ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings b/example/ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings
new file mode 100644
index 0000000..f9b0d7c
--- /dev/null
+++ b/example/ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings
@@ -0,0 +1,8 @@
+
+
+
+
+ PreviewsEnabled
+
+
+
diff --git a/example/ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme b/example/ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme
new file mode 100644
index 0000000..8e3ca5d
--- /dev/null
+++ b/example/ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme
@@ -0,0 +1,98 @@
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/example/ios/Runner.xcworkspace/contents.xcworkspacedata b/example/ios/Runner.xcworkspace/contents.xcworkspacedata
new file mode 100644
index 0000000..21a3cc1
--- /dev/null
+++ b/example/ios/Runner.xcworkspace/contents.xcworkspacedata
@@ -0,0 +1,10 @@
+
+
+
+
+
+
+
diff --git a/example/ios/Runner.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist b/example/ios/Runner.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
new file mode 100644
index 0000000..18d9810
--- /dev/null
+++ b/example/ios/Runner.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
@@ -0,0 +1,8 @@
+
+
+
+
+ IDEDidComputeMac32BitWarning
+
+
+
diff --git a/example/ios/Runner.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings b/example/ios/Runner.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings
new file mode 100644
index 0000000..f9b0d7c
--- /dev/null
+++ b/example/ios/Runner.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings
@@ -0,0 +1,8 @@
+
+
+
+
+ PreviewsEnabled
+
+
+
diff --git a/example/ios/Runner/AppDelegate.swift b/example/ios/Runner/AppDelegate.swift
new file mode 100644
index 0000000..6266644
--- /dev/null
+++ b/example/ios/Runner/AppDelegate.swift
@@ -0,0 +1,13 @@
+import Flutter
+import UIKit
+
+@main
+@objc class AppDelegate: FlutterAppDelegate {
+ override func application(
+ _ application: UIApplication,
+ didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
+ ) -> Bool {
+ GeneratedPluginRegistrant.register(with: self)
+ return super.application(application, didFinishLaunchingWithOptions: launchOptions)
+ }
+}
diff --git a/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Contents.json b/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Contents.json
new file mode 100644
index 0000000..d36b1fa
--- /dev/null
+++ b/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Contents.json
@@ -0,0 +1,122 @@
+{
+ "images" : [
+ {
+ "size" : "20x20",
+ "idiom" : "iphone",
+ "filename" : "Icon-App-20x20@2x.png",
+ "scale" : "2x"
+ },
+ {
+ "size" : "20x20",
+ "idiom" : "iphone",
+ "filename" : "Icon-App-20x20@3x.png",
+ "scale" : "3x"
+ },
+ {
+ "size" : "29x29",
+ "idiom" : "iphone",
+ "filename" : "Icon-App-29x29@1x.png",
+ "scale" : "1x"
+ },
+ {
+ "size" : "29x29",
+ "idiom" : "iphone",
+ "filename" : "Icon-App-29x29@2x.png",
+ "scale" : "2x"
+ },
+ {
+ "size" : "29x29",
+ "idiom" : "iphone",
+ "filename" : "Icon-App-29x29@3x.png",
+ "scale" : "3x"
+ },
+ {
+ "size" : "40x40",
+ "idiom" : "iphone",
+ "filename" : "Icon-App-40x40@2x.png",
+ "scale" : "2x"
+ },
+ {
+ "size" : "40x40",
+ "idiom" : "iphone",
+ "filename" : "Icon-App-40x40@3x.png",
+ "scale" : "3x"
+ },
+ {
+ "size" : "60x60",
+ "idiom" : "iphone",
+ "filename" : "Icon-App-60x60@2x.png",
+ "scale" : "2x"
+ },
+ {
+ "size" : "60x60",
+ "idiom" : "iphone",
+ "filename" : "Icon-App-60x60@3x.png",
+ "scale" : "3x"
+ },
+ {
+ "size" : "20x20",
+ "idiom" : "ipad",
+ "filename" : "Icon-App-20x20@1x.png",
+ "scale" : "1x"
+ },
+ {
+ "size" : "20x20",
+ "idiom" : "ipad",
+ "filename" : "Icon-App-20x20@2x.png",
+ "scale" : "2x"
+ },
+ {
+ "size" : "29x29",
+ "idiom" : "ipad",
+ "filename" : "Icon-App-29x29@1x.png",
+ "scale" : "1x"
+ },
+ {
+ "size" : "29x29",
+ "idiom" : "ipad",
+ "filename" : "Icon-App-29x29@2x.png",
+ "scale" : "2x"
+ },
+ {
+ "size" : "40x40",
+ "idiom" : "ipad",
+ "filename" : "Icon-App-40x40@1x.png",
+ "scale" : "1x"
+ },
+ {
+ "size" : "40x40",
+ "idiom" : "ipad",
+ "filename" : "Icon-App-40x40@2x.png",
+ "scale" : "2x"
+ },
+ {
+ "size" : "76x76",
+ "idiom" : "ipad",
+ "filename" : "Icon-App-76x76@1x.png",
+ "scale" : "1x"
+ },
+ {
+ "size" : "76x76",
+ "idiom" : "ipad",
+ "filename" : "Icon-App-76x76@2x.png",
+ "scale" : "2x"
+ },
+ {
+ "size" : "83.5x83.5",
+ "idiom" : "ipad",
+ "filename" : "Icon-App-83.5x83.5@2x.png",
+ "scale" : "2x"
+ },
+ {
+ "size" : "1024x1024",
+ "idiom" : "ios-marketing",
+ "filename" : "Icon-App-1024x1024@1x.png",
+ "scale" : "1x"
+ }
+ ],
+ "info" : {
+ "version" : 1,
+ "author" : "xcode"
+ }
+}
diff --git a/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-1024x1024@1x.png b/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-1024x1024@1x.png
new file mode 100644
index 0000000..dc9ada4
Binary files /dev/null and b/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-1024x1024@1x.png differ
diff --git a/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-20x20@1x.png b/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-20x20@1x.png
new file mode 100644
index 0000000..7353c41
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diff --git a/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-83.5x83.5@2x.png b/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-83.5x83.5@2x.png
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diff --git a/example/ios/Runner/Assets.xcassets/LaunchImage.imageset/Contents.json b/example/ios/Runner/Assets.xcassets/LaunchImage.imageset/Contents.json
new file mode 100644
index 0000000..0bedcf2
--- /dev/null
+++ b/example/ios/Runner/Assets.xcassets/LaunchImage.imageset/Contents.json
@@ -0,0 +1,23 @@
+{
+ "images" : [
+ {
+ "idiom" : "universal",
+ "filename" : "LaunchImage.png",
+ "scale" : "1x"
+ },
+ {
+ "idiom" : "universal",
+ "filename" : "LaunchImage@2x.png",
+ "scale" : "2x"
+ },
+ {
+ "idiom" : "universal",
+ "filename" : "LaunchImage@3x.png",
+ "scale" : "3x"
+ }
+ ],
+ "info" : {
+ "version" : 1,
+ "author" : "xcode"
+ }
+}
diff --git a/example/ios/Runner/Assets.xcassets/LaunchImage.imageset/LaunchImage.png b/example/ios/Runner/Assets.xcassets/LaunchImage.imageset/LaunchImage.png
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diff --git a/example/ios/Runner/Assets.xcassets/LaunchImage.imageset/README.md b/example/ios/Runner/Assets.xcassets/LaunchImage.imageset/README.md
new file mode 100644
index 0000000..89c2725
--- /dev/null
+++ b/example/ios/Runner/Assets.xcassets/LaunchImage.imageset/README.md
@@ -0,0 +1,5 @@
+# Launch Screen Assets
+
+You can customize the launch screen with your own desired assets by replacing the image files in this directory.
+
+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.
\ No newline at end of file
diff --git a/example/ios/Runner/Base.lproj/LaunchScreen.storyboard b/example/ios/Runner/Base.lproj/LaunchScreen.storyboard
new file mode 100644
index 0000000..f2e259c
--- /dev/null
+++ b/example/ios/Runner/Base.lproj/LaunchScreen.storyboard
@@ -0,0 +1,37 @@
+
+
+
+
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+
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+
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+
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+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/example/ios/Runner/Base.lproj/Main.storyboard b/example/ios/Runner/Base.lproj/Main.storyboard
new file mode 100644
index 0000000..f3c2851
--- /dev/null
+++ b/example/ios/Runner/Base.lproj/Main.storyboard
@@ -0,0 +1,26 @@
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/example/ios/Runner/Info.plist b/example/ios/Runner/Info.plist
new file mode 100644
index 0000000..761b730
--- /dev/null
+++ b/example/ios/Runner/Info.plist
@@ -0,0 +1,49 @@
+
+
+
+
+ CFBundleDevelopmentRegion
+ $(DEVELOPMENT_LANGUAGE)
+ CFBundleDisplayName
+ Example
+ CFBundleExecutable
+ $(EXECUTABLE_NAME)
+ CFBundleIdentifier
+ $(PRODUCT_BUNDLE_IDENTIFIER)
+ CFBundleInfoDictionaryVersion
+ 6.0
+ CFBundleName
+ gravity_box_example
+ CFBundlePackageType
+ APPL
+ CFBundleShortVersionString
+ $(FLUTTER_BUILD_NAME)
+ CFBundleSignature
+ ????
+ CFBundleVersion
+ $(FLUTTER_BUILD_NUMBER)
+ LSRequiresIPhoneOS
+
+ UILaunchStoryboardName
+ LaunchScreen
+ UIMainStoryboardFile
+ Main
+ UISupportedInterfaceOrientations
+
+ UIInterfaceOrientationPortrait
+ UIInterfaceOrientationLandscapeLeft
+ UIInterfaceOrientationLandscapeRight
+
+ UISupportedInterfaceOrientations~ipad
+
+ UIInterfaceOrientationPortrait
+ UIInterfaceOrientationPortraitUpsideDown
+ UIInterfaceOrientationLandscapeLeft
+ UIInterfaceOrientationLandscapeRight
+
+ CADisableMinimumFrameDurationOnPhone
+
+ UIApplicationSupportsIndirectInputEvents
+
+
+
diff --git a/example/ios/Runner/Runner-Bridging-Header.h b/example/ios/Runner/Runner-Bridging-Header.h
new file mode 100644
index 0000000..308a2a5
--- /dev/null
+++ b/example/ios/Runner/Runner-Bridging-Header.h
@@ -0,0 +1 @@
+#import "GeneratedPluginRegistrant.h"
diff --git a/example/ios/RunnerTests/RunnerTests.swift b/example/ios/RunnerTests/RunnerTests.swift
new file mode 100644
index 0000000..86a7c3b
--- /dev/null
+++ b/example/ios/RunnerTests/RunnerTests.swift
@@ -0,0 +1,12 @@
+import Flutter
+import UIKit
+import XCTest
+
+class RunnerTests: XCTestCase {
+
+ func testExample() {
+ // If you add code to the Runner application, consider adding tests here.
+ // See https://developer.apple.com/documentation/xctest for more information about using XCTest.
+ }
+
+}
diff --git a/example/lib/main.dart b/example/lib/main.dart
new file mode 100644
index 0000000..a121e66
--- /dev/null
+++ b/example/lib/main.dart
@@ -0,0 +1,85 @@
+import 'package:flutter/material.dart';
+import 'package:gravity_box/gravity_box.dart';
+
+void main() {
+ runApp(const MainApp());
+}
+
+class MainApp extends StatelessWidget {
+ const MainApp({super.key});
+
+ @override
+ Widget build(BuildContext context) {
+ return MaterialApp(
+ debugShowCheckedModeBanner: false,
+ home: SafeArea(
+ child: Scaffold(
+ body: GravityBox(
+ debugShowObjectsPostion: true,
+ gravityObjects: [
+ GravityObject(
+ size: 100,
+ position: const Vector2(200, 200),
+ canRoll: true,
+ widget: Container(
+ decoration: const BoxDecoration(
+ color: Colors.red,
+ shape: BoxShape.circle,
+ ),
+ width: 100,
+ height: 100,
+ child: Center(
+ child: Container(
+ color: Colors.indigo,
+ width: 100,
+ height: 10,
+ ),
+ ),
+ ),
+ ),
+ ],
+ children: [
+ Container(
+ width: 100,
+ height: 100,
+ color: Colors.black,
+ ),
+ Align(
+ alignment: Alignment.topRight,
+ child: Container(
+ width: 100,
+ height: 100,
+ color: Colors.green,
+ ),
+ ),
+ Align(
+ alignment: Alignment.bottomLeft,
+ child: Container(
+ width: 100,
+ height: 100,
+ color: Colors.yellow,
+ ),
+ ),
+ Align(
+ alignment: Alignment.bottomRight,
+ child: Container(
+ width: 100,
+ height: 100,
+ color: Colors.orange,
+ ),
+ ),
+ Align(
+ alignment: Alignment.center,
+ child: Container(
+ width: 100,
+ height: 100,
+ color: Colors.purple,
+ ),
+ ),
+ ],
+ ),
+ ),
+ ),
+ );
+ }
+}
diff --git a/example/pubspec.yaml b/example/pubspec.yaml
new file mode 100644
index 0000000..840dab3
--- /dev/null
+++ b/example/pubspec.yaml
@@ -0,0 +1,23 @@
+name: example
+description: "A new Flutter project."
+publish_to: 'none'
+version: 0.1.0
+
+environment:
+ sdk: '>=3.0.0 <4.0.0'
+ flutter: '>=3.10.0'
+
+dependencies:
+ flutter:
+ sdk: flutter
+
+ gravity_box:
+ path: ../
+
+dev_dependencies:
+ flutter_test:
+ sdk: flutter
+ flutter_lints: ^3.0.0
+
+flutter:
+ uses-material-design: true
diff --git a/lib/gravity_box.dart b/lib/gravity_box.dart
new file mode 100644
index 0000000..d2a2473
--- /dev/null
+++ b/lib/gravity_box.dart
@@ -0,0 +1,251 @@
+library;
+
+import 'dart:math' show pi;
+
+import 'package:flutter/material.dart';
+import 'package:flutter/scheduler.dart';
+
+import 'src/mixins/mixins.dart';
+import 'src/models/models.dart';
+import 'src/widgets/widgets.dart';
+
+export 'src/models/models.dart';
+
+/// {@template GravityBox}
+/// A widget that enables gravity simulation for each of its [GravityObject].
+///
+/// Also provides a simple collision system between [GravityObject] and [children].
+/// {@endtemplate}
+class GravityBox extends StatefulWidget {
+ /// Creates a [GravityBox].
+ ///
+ /// {@macro GravityBox}
+ const GravityBox({
+ super.key,
+ this.gravityObjects = const [],
+ this.children = const [],
+ this.notCollidableChildren = const [],
+ this.debugShowObjectsPostion = false,
+ });
+
+ /// The list of [GravityObject] that will be affected by gravity.
+ ///
+ /// See also [GravityObject].
+ final List gravityObjects;
+
+ /// The list of widgets that will be collidable with [GravityObject].
+ ///
+ /// See also [notCollidableChildren].
+ final List children;
+
+ /// The list of widgets that will not be collidable with [GravityObject].
+ ///
+ /// See also [children].
+ final List notCollidableChildren;
+
+ /// If `true`, a small label will be shown at the top-left corner of each
+ /// [GravityObject], displaying the object's current position and rect.
+ ///
+ /// Defaults to `false`.
+ final bool debugShowObjectsPostion;
+
+ @override
+ State createState() => _GravityBoxState();
+}
+
+class _GravityBoxState extends State
+ with SingleTickerProviderStateMixin, GravityInteractionMixin {
+ late final Ticker _ticker;
+ late final List> _gravityObjectNotifiers =
+ widget.gravityObjects.map((e) => ValueNotifier(e)).toList(growable: false);
+
+ Set _childrenRects = {};
+ Duration _lastElapsedDuration = const Duration();
+
+ @override
+ void initState() {
+ super.initState();
+
+ _ticker = createTicker(_onTick);
+ _ticker.start();
+ }
+
+ @override
+ void dispose() {
+ for (final ValueNotifier valueNotifier in _gravityObjectNotifiers) {
+ valueNotifier.dispose();
+ }
+ _ticker.dispose();
+
+ super.dispose();
+ }
+
+ void _onTick(Duration elapsed) {
+ if (!canUpdate) return;
+
+ final double dt =
+ (elapsed - _lastElapsedDuration).inMicroseconds / Duration.microsecondsPerSecond;
+ _lastElapsedDuration = elapsed;
+
+ for (int i = 0; i < _gravityObjectNotifiers.length; i++) {
+ final ValueNotifier objectNotifier = _gravityObjectNotifiers[i];
+ objectNotifier.value = updateObject(objectNotifier.value, dt, i);
+ }
+ }
+
+ @override
+ Widget childBuilder(BuildContext context) {
+ return Stack(
+ fit: StackFit.expand,
+ children: [
+ ...widget.notCollidableChildren,
+ LayoutReporterStack(
+ children: widget.children,
+ onChildrenLayoutChanged: (childrenRects) => _childrenRects = childrenRects.toSet(),
+ ),
+ for (final ValueNotifier gravityObjectNotifier in _gravityObjectNotifiers)
+ ValueListenableBuilder(
+ valueListenable: gravityObjectNotifier,
+ builder: (_, GravityObject info, __) {
+ final Widget object = Transform.rotate(
+ angle: info.angle * (pi / 180),
+ child: info.widget,
+ );
+
+ return Positioned(
+ left: info.position.x,
+ top: info.position.y,
+ child: widget.debugShowObjectsPostion
+ ? GravityObjectDebugWrapperWidget(
+ objectInfo: info,
+ child: object,
+ )
+ : object,
+ );
+ },
+ ),
+ ],
+ );
+ }
+
+ @override
+ bool isObjectCollidesAtDirection(
+ Direction direction, {
+ required GravityObject object,
+ required int index,
+ }) {
+ final bool isCollidingWithObjects = _gravityObjectNotifiers.indexed.any(
+ (pair) {
+ if (pair.$1 == index) return false;
+
+ return _isObjectsColliding(direction, object, pair.$2.value);
+ },
+ );
+
+ final bool isCollidingWithChildren =
+ _childrenRects.any((e) => _isRectsColliding(direction, object.rect, e));
+
+ return isCollidingWithObjects || isCollidingWithChildren;
+ }
+
+ Vector2 _getObjectPosition(
+ Direction direction, {
+ required GravityObject object,
+ }) {
+ final double radius = object.radius;
+ final Vector2 position = object.position;
+
+ return switch (direction) {
+ Direction.left => Vector2(position.x, position.y + radius),
+ Direction.top => Vector2(position.x + radius, position.y),
+ Direction.right => Vector2(position.x + radius, position.y + radius),
+ Direction.bottom => Vector2(position.x + radius, position.y + radius)
+ };
+ }
+
+ Vector2 _getRectPosition(
+ Direction direction, {
+ required Rect rect,
+ }) {
+ return switch (direction) {
+ Direction.left => Vector2(rect.left, rect.top + rect.height / 2),
+ Direction.top => Vector2(rect.left + rect.width / 2, rect.top),
+ Direction.right => Vector2(rect.left + rect.width, rect.top + rect.height / 2),
+ Direction.bottom => Vector2(rect.left + rect.width / 2, rect.top + rect.height)
+ };
+ }
+
+ bool _isInetervalsOverlaps(
+ double aStart,
+ double bStart,
+ double aEnd,
+ double bEnd,
+ ) {
+ if (aStart <= bStart) {
+ return aStart + aEnd > bStart;
+ } else {
+ return bStart + bEnd > aStart;
+ }
+ }
+
+ bool _isRectsColliding(
+ Direction direction,
+ Rect a,
+ Rect b,
+ ) {
+ final Vector2 posA = _getRectPosition(direction, rect: a)..rounded;
+ final Vector2 posB = _getRectPosition(direction.opposite, rect: b)..rounded;
+ final bool isHorizontal = direction.isHorizontal;
+ late double aStart;
+ late double bStart;
+
+ aStart = isHorizontal
+ ? (posA.x - (direction.isRight ? a.width : 0))
+ : (posA.y - (direction.isBottom ? a.height : 0));
+ bStart = isHorizontal
+ ? (posB.x - (direction.isLeft ? b.width : 0))
+ : (posB.y - (direction.isTop ? b.height : 0));
+ final bool notIntersected =
+ direction.isLeft || direction.isTop ? aStart <= bStart : aStart >= bStart;
+ if (notIntersected || !_isInetervalsOverlaps(aStart, bStart, a.width, b.width)) {
+ return false;
+ }
+ aStart = isHorizontal ? posA.y - a.height / 2 : posA.x - a.width / 2;
+ bStart = isHorizontal ? posB.y - b.height / 2 : posB.x - b.width / 2;
+
+ return _isInetervalsOverlaps(
+ aStart,
+ bStart,
+ isHorizontal ? a.height : a.width,
+ isHorizontal ? b.height : b.width,
+ );
+ }
+
+ bool _isObjectsColliding(
+ Direction direction,
+ GravityObject a,
+ GravityObject b,
+ ) {
+ final Vector2 posA = _getObjectPosition(direction, object: a)..rounded;
+ final Vector2 posB = _getObjectPosition(direction.opposite, object: b)..rounded;
+ final bool isHorizontal = direction.isHorizontal;
+ late double aStart;
+ late double bStart;
+
+ aStart = isHorizontal
+ ? (posA.x - (direction.isRight ? a.size : 0))
+ : (posA.y - (direction.isBottom ? a.size : 0));
+ bStart = isHorizontal
+ ? (posB.x - (direction.isLeft ? b.size : 0))
+ : (posB.y - (direction.isTop ? b.size : 0));
+ final bool notIntersected =
+ direction.isLeft || direction.isTop ? aStart <= bStart : aStart >= bStart;
+ if (notIntersected || !_isInetervalsOverlaps(aStart, bStart, a.size, b.size)) {
+ return false;
+ }
+ aStart = isHorizontal ? posA.y - a.radius : posA.x - a.radius;
+ bStart = isHorizontal ? posB.y - b.radius : posB.x - b.radius;
+
+ return _isInetervalsOverlaps(aStart, bStart, a.size, b.size);
+ }
+}
diff --git a/lib/src/extensions.dart b/lib/src/extensions.dart
new file mode 100644
index 0000000..0d8c730
--- /dev/null
+++ b/lib/src/extensions.dart
@@ -0,0 +1,31 @@
+import 'models/models.dart';
+
+extension IterableX on Iterable {
+ bool containsWhere(bool Function(T element) test) {
+ for (T e in this) {
+ if (test(e)) return true;
+ }
+
+ return false;
+ }
+}
+
+extension SetDirectionX on Set {
+ bool get containsHorizontal => contains(Direction.left) || contains(Direction.right);
+ bool get containsVertical => contains(Direction.top) || contains(Direction.bottom);
+
+ bool get isFull => length == Direction.values.length;
+ bool get isNotFull => !isFull;
+
+ bool isMovingHorizontal(Set possibleDirections) =>
+ possibleDirections.contains(Direction.left) && contains(Direction.left) ||
+ possibleDirections.contains(Direction.right) && contains(Direction.right);
+
+ bool isMovingVertical(Set possibleDirections) =>
+ possibleDirections.contains(Direction.top) && contains(Direction.top) ||
+ possibleDirections.contains(Direction.bottom) && contains(Direction.bottom);
+
+ bool isRollingClockwise(Set possibleDirections) =>
+ Direction.values.any((Direction direction) =>
+ !possibleDirections.contains(direction) && contains(direction.clockwiseAdjacent));
+}
diff --git a/lib/src/mixins/gravity_interaction_mixin.dart b/lib/src/mixins/gravity_interaction_mixin.dart
new file mode 100644
index 0000000..aad449e
--- /dev/null
+++ b/lib/src/mixins/gravity_interaction_mixin.dart
@@ -0,0 +1,160 @@
+import 'dart:async';
+import 'dart:math' show pi;
+
+import 'package:flutter/material.dart';
+import 'package:gravity_box/gravity_box.dart';
+import 'package:gravity_box/src/extensions.dart';
+import 'package:gravity_box/src/widgets/widgets.dart';
+import 'package:gravity_sensor/gravity_sensor.dart';
+
+/// A mixin that adds ablity for gravity interaction to a [StatefulWidget]
+/// with its [updateObject] method, which is used to update the [GravityObject].
+///
+/// [isObjectCollidesAtDirection] should be implemented in the mixed class.
+///
+/// The mixin uses the [GravitySensor] package to get the device's gravity
+/// sensor data.
+///
+/// See also:
+///
+/// * [GravitySensor], the package used to get the device's gravity sensor data.
+/// * [GravityBox], the widget that uses this mixin.
+/// * [GravityObject], the model that represents an object in the [GravityBox].
+mixin GravityInteractionMixin on State {
+ late final StreamSubscription _gravityEventsSubscription;
+
+ GravityEvent _lastGravityEvent = const GravityEvent(0, 0, 0);
+ BoxConstraints _lastConstraints = const BoxConstraints();
+
+ bool get canUpdate =>
+ _lastConstraints.maxWidth.isFinite && _lastConstraints.maxHeight.isFinite && mounted;
+
+ @override
+ void initState() {
+ super.initState();
+
+ _gravityEventsSubscription = GravitySensor().gravityEvents.listen(_gravityEventsListener);
+ }
+
+ void _gravityEventsListener(GravityEvent event) => _lastGravityEvent = event;
+
+ @override
+ void dispose() {
+ _gravityEventsSubscription.cancel();
+
+ super.dispose();
+ }
+
+ @mustCallSuper
+ @override
+ Widget build(BuildContext context) {
+ return LayoutListener(
+ onContraintsChanged: (constraints) => _lastConstraints = constraints,
+ child: childBuilder(context),
+ );
+ }
+
+ /// The proxy method for [build]. Should be used instead of [build].
+ Widget childBuilder(BuildContext context);
+
+ /// Checks if the object is colliding with any other object,
+ /// widget or with the screen borders at the given direction..
+ bool isObjectCollidesAtDirection(
+ Direction direction, {
+ required GravityObject object,
+ required int index,
+ });
+
+ /// Updates the [GravityObject] position, velocity and angle based on the gravity.
+ ///
+ /// The [dt] parameter is the time difference in seconds since the last call.
+ ///
+ /// The [index] parameter is the index of the object in the list of objects.
+ ///
+ /// The method returns a new [GravityObject] with the updated values.
+ GravityObject updateObject(
+ GravityObject source,
+ double dt,
+ int index,
+ ) {
+ GravityObject object = source.copyWith(
+ velocity: source.velocity + Vector2(-_lastGravityEvent.x, _lastGravityEvent.y) * dt,
+ );
+ final double size = object.size;
+ Vector2 velocity = object.velocity;
+
+ final double maxPositionX = _getMaxPositionX(size);
+ final double maxPositionY = _getMaxPositionY(size);
+
+ final Set possibleDirections =
+ _getPossibleMovingDirections(object: object, index: index).toSet();
+ final Set actualDirections = _getActualMovingDirections(velocity).toSet();
+
+ if (!actualDirections.isMovingHorizontal(possibleDirections)) {
+ velocity = velocity.copyWith(x: 0);
+ }
+ if (!actualDirections.isMovingVertical(possibleDirections)) {
+ velocity = velocity.copyWith(y: 0);
+ }
+
+ final bool isColliding = possibleDirections.isNotFull;
+ if (isColliding && object.canRoll) {
+ final double vel = ((velocity.x != 0) ? velocity.x : velocity.y).abs();
+ final bool isRollingClockwise = actualDirections.isRollingClockwise(possibleDirections);
+
+ object = object.copyWith(angularVelocity: (isRollingClockwise ? vel : -vel) / size * pi);
+ }
+
+ final Vector2 min = Vector2.zero();
+ final Vector2 max = Vector2(maxPositionX, maxPositionY);
+ final Vector2 newPosition = (object.position + velocity).clamp(min, max);
+
+ return object.copyWith(
+ position: newPosition,
+ velocity: velocity,
+ angle: object.angle + object.angularVelocity,
+ );
+ }
+
+ double _getMaxPositionX(double objectSize) => _lastConstraints.maxWidth - objectSize;
+ double _getMaxPositionY(double objectSize) => _lastConstraints.maxHeight - objectSize;
+
+ Iterable _getPossibleMovingDirections({
+ required GravityObject object,
+ required int index,
+ }) sync* {
+ for (final Direction direction in Direction.values) {
+ if (_canMoveTo(direction, object: object, index: index)) yield direction;
+ }
+ }
+
+ Iterable _getActualMovingDirections(Vector2 velocity) sync* {
+ if (velocity.x.isNegative) yield Direction.left;
+ if (velocity.y.isNegative) yield Direction.top;
+ if (!velocity.x.isNegative && velocity.x != 0) yield Direction.right;
+ if (!velocity.y.isNegative && velocity.y != 0) yield Direction.bottom;
+ }
+
+ bool _canMoveTo(
+ Direction direction, {
+ required GravityObject object,
+ required int index,
+ }) {
+ final Vector2 position = object.position;
+ final double maxPositionX = _getMaxPositionX(object.size);
+ final double maxPositionY = _getMaxPositionY(object.size);
+
+ switch (direction) {
+ case Direction.left:
+ if (position.x <= 0) return false;
+ case Direction.top:
+ if (position.y <= 0) return false;
+ case Direction.right:
+ if (position.x.round() >= maxPositionX.round()) return false;
+ case Direction.bottom:
+ if (position.y.round() >= maxPositionY.round()) return false;
+ }
+
+ return !isObjectCollidesAtDirection(direction, object: object, index: index);
+ }
+}
diff --git a/lib/src/mixins/mixins.dart b/lib/src/mixins/mixins.dart
new file mode 100644
index 0000000..dba2040
--- /dev/null
+++ b/lib/src/mixins/mixins.dart
@@ -0,0 +1,2 @@
+export 'gravity_interaction_mixin.dart';
+export 'stringify.dart';
diff --git a/lib/src/mixins/stringify.dart b/lib/src/mixins/stringify.dart
new file mode 100644
index 0000000..7ebfca8
--- /dev/null
+++ b/lib/src/mixins/stringify.dart
@@ -0,0 +1,16 @@
+/// A mixin that adds a [toString] method to any class that
+/// mixed with it. The [toString] method will return a string
+/// in the format of '$runtimeType $mappedFields.toString()'
+/// where [mappedFields] is a map of the object's fields.
+mixin Stringify {
+ /// A map of the object's fields.
+ ///
+ /// The keys are the fields names and the values are the fields values.
+ ///
+ /// The default implementation returns an empty map.
+ /// You should override this method to return a map of the object's fields.
+ Map get mappedFields => {};
+
+ @override
+ String toString() => '$runtimeType ${mappedFields.toString()}';
+}
diff --git a/lib/src/models/direction.dart b/lib/src/models/direction.dart
new file mode 100644
index 0000000..81fa403
--- /dev/null
+++ b/lib/src/models/direction.dart
@@ -0,0 +1,55 @@
+/// A direction on a 2D plane.
+///
+/// The 2D plane can be thought of as a mobile screen, where
+/// [Direction.values] is the sides of the screen respectively.
+enum Direction {
+ /// The left side of the 2D plane.
+ left,
+
+ /// The top side of the 2D plane.
+ top,
+
+ /// The right side of the 2D plane.
+ right,
+
+ /// The bottom side of the 2D plane.
+ bottom;
+
+ /// Whether this direction is [Direction.left].
+ bool get isLeft => this == Direction.left;
+
+ /// Whether this direction is [Direction.top].
+ bool get isTop => this == Direction.top;
+
+ /// Whether this direction is [Direction.right].
+ bool get isRight => this == Direction.right;
+
+ /// Whether this direction is [Direction.bottom].
+ bool get isBottom => this == Direction.bottom;
+
+ /// Whether this direction is either [Direction.left] or [Direction.right].
+ bool get isHorizontal => isLeft || isRight;
+
+ /// Whether this direction is either [Direction.top] or [Direction.bottom].
+ bool get isVertical => isTop || isBottom;
+
+ /// The opposite direction of this direction.
+ ///
+ /// For example, the opposite direction of [Direction.left] is [Direction.right].
+ Direction get opposite => switch (this) {
+ Direction.left => Direction.right,
+ Direction.top => Direction.bottom,
+ Direction.right => Direction.left,
+ Direction.bottom => Direction.top
+ };
+
+ /// The adjacent direction of this direction clockwise.
+ ///
+ /// For example, the clockwise adjacent direction of [Direction.left] is [Direction.bottom].
+ Direction get clockwiseAdjacent => switch (this) {
+ Direction.left => Direction.bottom,
+ Direction.top => Direction.left,
+ Direction.right => Direction.top,
+ Direction.bottom => Direction.right
+ };
+}
diff --git a/lib/src/models/gravity_object.dart b/lib/src/models/gravity_object.dart
new file mode 100644
index 0000000..b027cd2
--- /dev/null
+++ b/lib/src/models/gravity_object.dart
@@ -0,0 +1,104 @@
+import 'package:flutter/material.dart';
+import 'package:gravity_box/gravity_box.dart';
+import 'package:gravity_box/src/mixins/mixins.dart';
+
+/// {@template GravityObject}
+/// A model that represents an object in the [GravityBox].
+///
+/// It contains the info of the object such as its [size], [position], [velocity],
+/// whether it [canRoll] or not, [angle] and [angularVelocity].
+///
+/// The [widget] is the widget that will be displayed as the object.
+/// {@endtemplate}
+class GravityObject with Stringify {
+ /// Creates a [GravityObject].
+ ///
+ /// {@macro GravityObject}
+ const GravityObject({
+ required this.size,
+ this.position = const Vector2(0, 0),
+ this.canRoll = false,
+ this.angle = 0,
+ this.angularVelocity = 0,
+ required this.widget,
+ }) : _velocity = const Vector2(0, 0);
+
+ const GravityObject._({
+ required this.size,
+ this.position = const Vector2(0, 0),
+ this.canRoll = false,
+ this.angle = 0,
+ this.angularVelocity = 0,
+ required this.widget,
+ required Vector2 velocity,
+ }) : _velocity = velocity;
+
+ /// The size of the object, used to calculate its bounding box.
+ ///
+ /// The size of the [widget] is not respected.
+ final double size;
+
+ /// The initial position of the object on the constraints of [GravityBox].
+ final Vector2 position;
+
+ /// Whether the object can roll or not.
+ final bool canRoll;
+
+ /// The rotation angle of the object in clockwise radians.
+ final double angle;
+
+ /// The angular velocity of the object.
+ final double angularVelocity;
+
+ /// The widget that will be displayed as the object.
+ final Widget widget;
+
+ final Vector2 _velocity;
+
+ /// The velocity of the object.
+
+ Vector2 get velocity => _velocity;
+
+ /// The radius of the object.
+ ///
+ /// It is half of the [size].
+ double get radius => size / 2;
+
+ /// The bounding box of the object on the constraints of [GravityBox].
+ ///
+ /// It is a square with the [size], starting in the [position].
+ Rect get rect => Offset(position.x, position.y) & Size.square(size);
+
+ /// Creates a new [GravityObject] with the given properties.
+ ///
+ /// Any null value will use the value from the current object.
+ GravityObject copyWith({
+ Widget? widget,
+ double? size,
+ Vector2? position,
+ Vector2? velocity,
+ bool? canRoll,
+ double? angle,
+ double? angularVelocity,
+ }) =>
+ GravityObject._(
+ widget: widget ?? this.widget,
+ size: size ?? this.size,
+ position: position ?? this.position,
+ velocity: velocity ?? this.velocity,
+ canRoll: canRoll ?? this.canRoll,
+ angle: angle ?? this.angle,
+ angularVelocity: angularVelocity ?? this.angularVelocity,
+ );
+
+ @override
+ Map get mappedFields => {
+ 'widget': widget,
+ 'size': size,
+ 'position': position,
+ 'velocity': velocity,
+ 'canRoll': canRoll,
+ 'angle': angle,
+ 'angularVelocity': angularVelocity,
+ };
+}
diff --git a/lib/src/models/models.dart b/lib/src/models/models.dart
new file mode 100644
index 0000000..7da8223
--- /dev/null
+++ b/lib/src/models/models.dart
@@ -0,0 +1,3 @@
+export 'direction.dart';
+export 'gravity_object.dart';
+export 'vector.dart';
diff --git a/lib/src/models/vector.dart b/lib/src/models/vector.dart
new file mode 100644
index 0000000..ab45dd1
--- /dev/null
+++ b/lib/src/models/vector.dart
@@ -0,0 +1,53 @@
+import 'package:gravity_box/src/mixins/stringify.dart';
+
+class Vector2 with Stringify {
+ const Vector2(this.x, this.y);
+
+ factory Vector2.zero() => const Vector2(0, 0);
+
+ final double x;
+ final double y;
+
+ Vector2 get rounded => Vector2(
+ x.roundToDouble(),
+ y.roundToDouble(),
+ );
+
+ @override
+ Map get mappedFields => {
+ 'x': x,
+ 'y': y,
+ };
+
+ Vector2 copyWith({
+ double? x,
+ double? y,
+ }) =>
+ Vector2(
+ x ?? this.x,
+ y ?? this.y,
+ );
+
+ Vector2 clone() => copyWith();
+
+ Vector2 clamp(
+ Vector2 min,
+ Vector2 max,
+ ) =>
+ copyWith(
+ x: x.clamp(min.x, max.x),
+ y: y.clamp(min.y, max.y),
+ );
+
+ /// Add two vectors.
+ Vector2 operator +(Vector2 other) => copyWith(
+ x: x + other.x,
+ y: y + other.y,
+ );
+
+ /// Scale vector.
+ Vector2 operator *(double scale) => copyWith(
+ x: x * scale,
+ y: y * scale,
+ );
+}
diff --git a/lib/src/widgets/gravity_object_debug_wrapper_widget.dart b/lib/src/widgets/gravity_object_debug_wrapper_widget.dart
new file mode 100644
index 0000000..72e006d
--- /dev/null
+++ b/lib/src/widgets/gravity_object_debug_wrapper_widget.dart
@@ -0,0 +1,59 @@
+import 'package:flutter/material.dart';
+import 'package:gravity_box/src/models/models.dart';
+
+/// {@template GravityObjectDebugWrapperWidget}
+/// A widget that shows the debug info of a [GravityObject].
+///
+/// The widget will show the object's position and borders.
+/// {@endtemplate}
+class GravityObjectDebugWrapperWidget extends StatelessWidget {
+ /// Creates a [GravityObjectDebugWrapperWidget].
+ ///
+ /// {@macro GravityObjectDebugWrapperWidget}
+ const GravityObjectDebugWrapperWidget({
+ super.key,
+ required this.objectInfo,
+ required this.child,
+ });
+
+ /// The [GravityObject] that is being debugged.
+ final GravityObject objectInfo;
+
+ /// The widget to be wrapped.
+ final Widget child;
+
+ @override
+ Widget build(BuildContext context) {
+ return Stack(
+ children: [
+ DecoratedBox(
+ decoration: BoxDecoration(
+ border: Border.all(),
+ ),
+ child: child,
+ ),
+ Row(
+ children: [
+ const Padding(
+ padding: EdgeInsets.only(right: 16),
+ child: Column(
+ crossAxisAlignment: CrossAxisAlignment.start,
+ children: [
+ Text('x:'),
+ Text('y:'),
+ ],
+ ),
+ ),
+ Column(
+ crossAxisAlignment: CrossAxisAlignment.start,
+ children: [
+ Text(objectInfo.position.x.toStringAsFixed(2)),
+ Text(objectInfo.position.y.toStringAsFixed(2)),
+ ],
+ ),
+ ],
+ ),
+ ],
+ );
+ }
+}
diff --git a/lib/src/widgets/layout_listener.dart b/lib/src/widgets/layout_listener.dart
new file mode 100644
index 0000000..f1b4e09
--- /dev/null
+++ b/lib/src/widgets/layout_listener.dart
@@ -0,0 +1,58 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/rendering.dart';
+
+/// {@template LayoutListener}
+/// A widget that calls a [onContraintsChanged] callback
+/// whenever the layout constraints change.
+///
+/// Useful for debugging or testing.
+///
+/// See also:
+///
+/// * [LayoutBuilder], which provides a way to build a widget tree
+/// based on the parent widget's layout constraints.
+/// {@endtemplate}
+class LayoutListener extends SingleChildRenderObjectWidget {
+ /// Creates a [LayoutListener].
+ ///
+ /// {@macro LayoutListener}
+ const LayoutListener({
+ super.key,
+ required this.onContraintsChanged,
+ super.child,
+ });
+
+ /// The callback that is called whenever the layout constraints change.
+ ///
+ /// The argument is the new [BoxConstraints].
+ final ValueChanged onContraintsChanged;
+
+ @override
+ RenderObject createRenderObject(context) {
+ return _LayoutReporterRenderProxyBox(onContraintsChanged: onContraintsChanged);
+ }
+}
+
+class _LayoutReporterRenderProxyBox extends RenderProxyBox {
+ _LayoutReporterRenderProxyBox({
+ required this.onContraintsChanged,
+ });
+
+ final ValueChanged onContraintsChanged;
+
+ BoxConstraints? _lastContraints;
+
+ @override
+ void performLayout() {
+ if (_lastContraints == null) {
+ onContraintsChanged(_lastContraints ??= constraints);
+ }
+
+ if (_lastContraints != constraints) {
+ onContraintsChanged(constraints);
+ _lastContraints = constraints;
+ }
+
+ return super.performLayout();
+ }
+}
diff --git a/lib/src/widgets/layout_reporter_stack.dart b/lib/src/widgets/layout_reporter_stack.dart
new file mode 100644
index 0000000..89deeaa
--- /dev/null
+++ b/lib/src/widgets/layout_reporter_stack.dart
@@ -0,0 +1,110 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/rendering.dart';
+
+/// {@template LayoutReporterStack}
+/// A [Stack] that calls [onChildrenLayoutChanged] whenever the layout constraints change.
+///
+/// The [onChildrenLayoutChanged] callback is called with the layout constraints of all
+/// the children in the stack. The constraints are given as a list of [Rect]s, where
+/// each [Rect] represents the position and size of a single child.
+/// {@endtemplate}
+class LayoutReporterStack extends Stack {
+ /// Creates a [LayoutReporterStack].
+ ///
+ /// {@macro LayoutReporterStack}
+ const LayoutReporterStack({
+ super.key,
+ super.children,
+ required this.onChildrenLayoutChanged,
+ });
+
+ /// The callback that is called when the layout constraints of the children change.
+ ///
+ /// The callback is called with a list of [Rect]s, where each [Rect] represents the
+ /// position and size of a single child.
+ final void Function(Iterable childrenRects) onChildrenLayoutChanged;
+
+ @override
+ RenderStack createRenderObject(BuildContext context) {
+ return _LayoutReporterRenderStack(
+ alignment: alignment,
+ textDirection: textDirection ?? Directionality.maybeOf(context),
+ fit: fit,
+ clipBehavior: clipBehavior,
+ onChildrenLayoutChanged: onChildrenLayoutChanged,
+ );
+ }
+}
+
+class _LayoutReporterRenderStack extends RenderStack {
+ _LayoutReporterRenderStack({
+ super.alignment,
+ super.textDirection,
+ super.fit,
+ super.clipBehavior,
+ required this.onChildrenLayoutChanged,
+ });
+
+ final void Function(Iterable childrenRects) onChildrenLayoutChanged;
+
+ @override
+ void paint(PaintingContext context, Offset offset) {
+ onChildrenLayoutChanged(_getChildRects());
+
+ return super.paint(context, offset);
+ }
+
+ Iterable _getChildRects() sync* {
+ RenderBox? child = firstChild;
+
+ while (child != null) {
+ final StackParentData? childParentData = child.parentData as StackParentData?;
+
+ if (!child.hasSize) {
+ child = childParentData?.nextSibling;
+
+ continue;
+ }
+
+ if (child is RenderPositionedBox) {
+ final Alignment? alignment =
+ child.alignment is Alignment ? (child.alignment as Alignment) : null;
+ final Size size = child.child?.size ?? child.size;
+
+ final double width = size.width.isFinite ? size.width : constraints.maxWidth;
+ final double height = size.height.isFinite ? size.height : constraints.maxHeight;
+
+ final rect = Rect.fromLTWH(
+ alignment == null ? 0 : _lerp(alignment.x, width, constraints.maxWidth),
+ alignment == null ? 0 : _lerp(alignment.y, height, constraints.maxHeight),
+ width,
+ height,
+ );
+
+ yield rect;
+ } else {
+ final Offset? offset = childParentData?.offset;
+ final Size size = child.size;
+
+ yield Rect.fromLTWH(
+ offset?.dx ?? 0,
+ offset?.dy ?? 0,
+ size.width.isFinite ? size.width : constraints.maxWidth,
+ size.height.isFinite ? size.height : constraints.maxHeight,
+ );
+ }
+
+ child = childParentData?.nextSibling;
+ }
+ }
+
+ double _lerp(double alignment, double size, double maxSize) {
+ if (alignment == 0) return maxSize / 2 - size / 2;
+
+ if (alignment > 0) {
+ return (maxSize - size) * alignment;
+ } else {
+ return (-maxSize + size) * (1 + alignment);
+ }
+ }
+}
diff --git a/lib/src/widgets/widgets.dart b/lib/src/widgets/widgets.dart
new file mode 100644
index 0000000..453fb0e
--- /dev/null
+++ b/lib/src/widgets/widgets.dart
@@ -0,0 +1,3 @@
+export 'gravity_object_debug_wrapper_widget.dart';
+export 'layout_listener.dart';
+export 'layout_reporter_stack.dart';
diff --git a/pubspec.yaml b/pubspec.yaml
new file mode 100644
index 0000000..c375eac
--- /dev/null
+++ b/pubspec.yaml
@@ -0,0 +1,33 @@
+name: gravity_box
+version: 1.0.0
+description: A Flutter library that provides a GravityBox widget for simulating gravity inside of it.
+homepage: https://madbrains.ru/
+repository: https://github.com/madbrains/gravity_box
+issue_tracker: https://github.com/madbrains/gravity_box/issues
+dart_line_length: 100
+
+platforms:
+ android:
+ ios:
+
+environment:
+ sdk: '>=3.0.0 <4.0.0'
+ flutter: '>=3.10.0'
+
+dependencies:
+ flutter:
+ sdk: flutter
+
+ gravity_sensor: ^1.0.1
+
+dev_dependencies:
+ flutter_test:
+ sdk: flutter
+ flutter_lints: ^5.0.0
+
+topics:
+ - widget
+ - ui
+ - flutter
+ - gravity
+ - box
\ No newline at end of file
diff --git a/test/gravity_box_test.dart b/test/gravity_box_test.dart
new file mode 100644
index 0000000..b47dcfe
--- /dev/null
+++ b/test/gravity_box_test.dart
@@ -0,0 +1,13 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:gravity_box/gravity_box.dart';
+
+void main() {
+ testWidgets(
+ 'GravityBox() can be constructed',
+ (WidgetTester tester) async {
+ await tester.pumpWidget(
+ const GravityBox(),
+ );
+ },
+ );
+}
diff --git a/tool/bump-version.sh b/tool/bump-version.sh
new file mode 100755
index 0000000..a7b219b
--- /dev/null
+++ b/tool/bump-version.sh
@@ -0,0 +1,16 @@
+#!/bin/bash
+
+set -euo pipefail
+
+SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+cd $SCRIPT_DIR/..
+
+NEW_VERSION="${1}"
+
+echo "Bumping version: ${NEW_VERSION}"
+
+perl -pi -e "s/^version: .*/version: $NEW_VERSION/" pubspec.yaml
+
+echo -e "## ${NEW_VERSION}\n\nTODO: describe new changes.\n" | cat - CHANGELOG.md > temp && mv temp CHANGELOG.md
+echo -e "\033[32mVersion bumped to ${NEW_VERSION}\033[m"
+echo -e "\033[33mDon't forget to describe the new version in CHANGELOG.md\033[m"
\ No newline at end of file
diff --git a/tool/validate-formatting.sh b/tool/validate-formatting.sh
new file mode 100755
index 0000000..7463e10
--- /dev/null
+++ b/tool/validate-formatting.sh
@@ -0,0 +1,31 @@
+#!/bin/bash
+
+if [[ $(git ls-files --modified) ]]; then
+ echo ""
+ echo ""
+ echo "These files are not formatted correctly:"
+ for f in $(git ls-files --modified); do
+ echo ""
+ echo ""
+ echo "-----------------------------------------------------------------"
+ echo "$f"
+ echo "-----------------------------------------------------------------"
+ echo ""
+ git --no-pager diff --unified=0 --minimal $f
+ echo ""
+ echo "-----------------------------------------------------------------"
+ echo ""
+ echo ""
+ done
+ if [[ $GITHUB_WORKFLOW ]]; then
+ git checkout . > /dev/null 2>&1
+ fi
+ echo ""
+ echo "❌ Some files are incorrectly formatted, see above output."
+ echo ""
+ echo "To fix these locally, run: 'melos run format'."
+ exit 1
+else
+ echo ""
+ echo "✅ All files are formatted correctly."
+fi
\ No newline at end of file
diff --git a/tool/verify_pub_score.sh b/tool/verify_pub_score.sh
new file mode 100755
index 0000000..f1c2e36
--- /dev/null
+++ b/tool/verify_pub_score.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+
+# Runs `pana . --no-warning` and verifies that the package score
+# is greater or equal to the desired score. By default the desired score is
+# a perfect score but it can be overridden by passing the desired score as an argument.
+#
+# Ensure the package has a score of at least a 100
+# `./verify_pub_score.sh 100`
+#
+# Ensure the package has a perfect score
+# `./verify_pub_score.sh`
+
+PANA=$(pana . --no-warning); PANA_SCORE=$(echo $PANA | sed -n "s/.*Points: \([0-9]*\)\/\([0-9]*\)./\1\/\2/p")
+echo "score: $PANA_SCORE"
+IFS='/'; read -a SCORE_ARR <<< "$PANA_SCORE"; SCORE=SCORE_ARR[0]; TOTAL=SCORE_ARR[1]
+if [ -z "$1" ]; then MINIMUM_SCORE=TOTAL; else MINIMUM_SCORE=$1; fi
+if (( $SCORE < $MINIMUM_SCORE )); then echo "minimum score $MINIMUM_SCORE was not met!"; exit 1; fi
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