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Merge pull request #6 from okaryo/feature/preload-indexes
Add `preloadIndexes` Property for Advanced Element Preloading
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.github/workflows/test-and-lint.yml renamed to .github/workflows/ci.yml

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name: Test and Lint
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name: CI
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on:
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push:
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env:
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FLUTTER_VERSION: 3.10.0
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jobs:
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test:
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name: Run test
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v3
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- uses: actions/checkout@v4
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- name: Set up Flutter
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uses: subosito/flutter-action@v2
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with:
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flutter-version: ${{ env.FLUTTER_VERSION }}
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channel: 'stable'
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- name: Run pub get
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run: flutter pub get
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name: Run lint
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v3
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- uses: actions/checkout@v4
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- name: Set up Flutter
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uses: subosito/flutter-action@v2
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with:
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flutter-version: ${{ env.FLUTTER_VERSION }}
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channel: 'stable'
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- name: Run pub get
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run: flutter pub get

‎README.md‎

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[![Test and Lint](https://github.com/okaryo/lazy_load_indexed_stack/actions/workflows/test-and-lint.yml/badge.svg)](https://github.com/okaryo/lazy_load_indexed_stack/actions/workflows/test-and-lint.yml)
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[![CI](https://github.com/okaryo/lazy_load_indexed_stack/actions/workflows/ci.yml/badge.svg)](https://github.com/okaryo/lazy_load_indexed_stack/actions/workflows/ci.yml)
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[![Pub](https://img.shields.io/pub/v/lazy_load_indexed_stack)](https://pub.dev/packages/lazy_load_indexed_stack)
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# lazy_load_indexed_stack
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Therefore, we created an extended IndexedStack that builds the required widget only when it is needed, and returns the pre-built widget when it is needed again.
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## Features
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* **Lazy Loading**: The main feature of `LazyLoadIndexedStack` is to build children widgets only when they are needed, reducing initial load time.
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* **Preloading**: With the `preloadIndexes` parameter, you can specify indexes of children that should be built in advance, even if they are not currently visible. This is useful for preloading widgets that are likely to be needed soon.
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## Usage
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You can use `LazyLoadIndexedStack` in the same way as `IndexedStack`.
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home: Scaffold(
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body: LazyLoadIndexedStack(
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index: _index,
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preloadIndexes: const [3],
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children: [
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Page1(),
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Page2(),
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Page3(),
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Page4(), // index3 is preloaded
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],
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),
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bottomNavigationBar: BottomNavigationBar(
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BottomNavigationBarItem1(),
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BottomNavigationBarItem2(),
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BottomNavigationBarItem3(),
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BottomNavigationBarItem4(),
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],
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),
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),

‎example/README.md‎

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# example
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A new Flutter project.
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## Getting Started
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This project is a starting point for a Flutter application.
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A few resources to get you started if this is your first Flutter project:
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- [Lab: Write your first Flutter app](https://docs.flutter.dev/get-started/codelab)
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- [Cookbook: Useful Flutter samples](https://docs.flutter.dev/cookbook)
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For help getting started with Flutter development, view the
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[online documentation](https://docs.flutter.dev/), which offers tutorials,
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samples, guidance on mobile development, and a full API reference.

‎example/analysis_options.yaml‎

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# This file configures the analyzer, which statically analyzes Dart code to
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# check for errors, warnings, and lints.
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#
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# The issues identified by the analyzer are surfaced in the UI of Dart-enabled
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# IDEs (https://dart.dev/tools#ides-and-editors). The analyzer can also be
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# invoked from the command line by running `flutter analyze`.
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# The following line activates a set of recommended lints for Flutter apps,
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# packages, and plugins designed to encourage good coding practices.
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include: package:flutter_lints/flutter.yaml
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linter:
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# The lint rules applied to this project can be customized in the
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# section below to disable rules from the `package:flutter_lints/flutter.yaml`
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# included above or to enable additional rules. A list of all available lints
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# and their documentation is published at
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# https://dart-lang.github.io/linter/lints/index.html.
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#
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# Instead of disabling a lint rule for the entire project in the
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# section below, it can also be suppressed for a single line of code
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# or a specific dart file by using the `// ignore: name_of_lint` and
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# `// ignore_for_file: name_of_lint` syntax on the line or in the file
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# producing the lint.
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rules:
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# avoid_print: false # Uncomment to disable the `avoid_print` rule
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# prefer_single_quotes: true # Uncomment to enable the `prefer_single_quotes` rule
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# Additional information about this file can be found at
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# https://dart.dev/guides/language/analysis-options

‎example/android/.gitignore‎

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gradle-wrapper.jar
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/.gradle
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/captures/
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/gradlew
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/gradlew.bat
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/local.properties
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GeneratedPluginRegistrant.java
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# Remember to never publicly share your keystore.
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# See https://flutter.dev/docs/deployment/android#reference-the-keystore-from-the-app
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key.properties
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**/*.keystore
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**/*.jks

‎example/android/app/build.gradle‎

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def localProperties = new Properties()
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def localPropertiesFile = rootProject.file('local.properties')
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if (localPropertiesFile.exists()) {
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localPropertiesFile.withReader('UTF-8') { reader ->
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localProperties.load(reader)
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}
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}
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def flutterRoot = localProperties.getProperty('flutter.sdk')
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if (flutterRoot == null) {
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throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
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}
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def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
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if (flutterVersionCode == null) {
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flutterVersionCode = '1'
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}
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def flutterVersionName = localProperties.getProperty('flutter.versionName')
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if (flutterVersionName == null) {
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flutterVersionName = '1.0'
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}
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apply plugin: 'com.android.application'
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apply plugin: 'kotlin-android'
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apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
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android {
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namespace "com.example.example"
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compileSdkVersion flutter.compileSdkVersion
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ndkVersion flutter.ndkVersion
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compileOptions {
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sourceCompatibility JavaVersion.VERSION_1_8
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targetCompatibility JavaVersion.VERSION_1_8
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}
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kotlinOptions {
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jvmTarget = '1.8'
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}
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sourceSets {
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main.java.srcDirs += 'src/main/kotlin'
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}
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defaultConfig {
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// TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
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applicationId "com.example.example"
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// You can update the following values to match your application needs.
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// For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration.
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minSdkVersion flutter.minSdkVersion
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targetSdkVersion flutter.targetSdkVersion
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versionCode flutterVersionCode.toInteger()
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versionName flutterVersionName
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}
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buildTypes {
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release {
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// TODO: Add your own signing config for the release build.
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// Signing with the debug keys for now, so `flutter run --release` works.
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signingConfig signingConfigs.debug
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}
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}
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}
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flutter {
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source '../..'
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}
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dependencies {
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implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
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}

‎example/android/app/src/debug/AndroidManifest.xml‎

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<manifest xmlns:android="http://schemas.android.com/apk/res/android">
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<!-- The INTERNET permission is required for development. Specifically,
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the Flutter tool needs it to communicate with the running application
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to allow setting breakpoints, to provide hot reload, etc.
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-->
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<uses-permission android:name="android.permission.INTERNET"/>
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</manifest>

‎example/android/app/src/main/AndroidManifest.xml‎

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<manifest xmlns:android="http://schemas.android.com/apk/res/android"
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package="com.example.lazy_load_indexed_stack">
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<application
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android:label="lazy_load_indexed_stack_example"
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android:name="${applicationName}"
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android:icon="@mipmap/ic_launcher">
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<activity
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android:name=".MainActivity"
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android:exported="true"
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android:launchMode="singleTop"
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android:theme="@style/LaunchTheme"
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android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
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android:hardwareAccelerated="true"
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android:windowSoftInputMode="adjustResize">
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<!-- Specifies an Android theme to apply to this Activity as soon as
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the Android process has started. This theme is visible to the user
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while the Flutter UI initializes. After that, this theme continues
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to determine the Window background behind the Flutter UI. -->
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<meta-data
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android:name="io.flutter.embedding.android.NormalTheme"
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android:resource="@style/NormalTheme"
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/>
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<intent-filter>
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<action android:name="android.intent.action.MAIN"/>
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<category android:name="android.intent.category.LAUNCHER"/>
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</intent-filter>
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</activity>
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<!-- Don't delete the meta-data below.
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This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
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<meta-data
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android:name="flutterEmbedding"
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android:value="2" />
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</application>
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</manifest>

‎example/android/app/src/main/kotlin/com/example/example/MainActivity.kt‎

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package com.example.example
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import io.flutter.embedding.android.FlutterActivity
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class MainActivity: FlutterActivity() {
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}

‎example/android/app/src/main/res/drawable-v21/launch_background.xml‎

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<?xml version="1.0" encoding="utf-8"?>
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<!-- Modify this file to customize your launch splash screen -->
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<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
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<item android:drawable="?android:colorBackground" />
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<!-- You can insert your own image assets here -->
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<!-- <item>
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<bitmap
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android:gravity="center"
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android:src="@mipmap/launch_image" />
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</item> -->
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</layer-list>

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