Add the infinite_list sample (#440)

This PR adds a Flutter sample app that shows an implementation of the "infinite list" UX pattern. That is, a list is shown to the user as if it was continuous although it is internally paginated. This is a common feature of mobile apps, from shopping catalogs through search engines to social media clients.
5 years ago · 1d8cfa11c5
parent baa1f976b2
commit 1d8cfa11c5
73 changed files with 1947 additions and 0 deletions
--- a/INDEX.md
+++ b/INDEX.md
@ -101,6 +101,12 @@ A collection of animation examples. The app starts with basic concepts like
 `AnimationController` and `Tween`, then progresses to transitions and
 advanced demos.

+#### [Infinite list](infinite_list) _(Flutter team)_
+
+A sample implementation of the infinite list, a common UI pattern in which
+an arbitrarily large, paginated catalog is presented as a seamless
+"infinite" `ListView`.
+
 ## Maps

 #### [Place tracker](place_tracker) _(Flutter team)_
--- a/MAINTENANCE.md
+++ b/MAINTENANCE.md
@ -10,6 +10,7 @@ match any new language/SDK features, etc.).
 | chrome-os-best-practices  |                    |                |
 | experimental              |                    |                |
 | flutter_maps_firestore    |                    |                |
+| infinite_list             | filiph             | 5/13/20        |
 | isolate_example           | johnpryan          | 11/21/19       |
 | jsonexample               | redbrogdon         | 1/3/20         |
 | material_studies/shrine   |                    |                |
--- a/4
+++ b/4
@ -9,6 +9,10 @@ cd "flutter_maps_firestore"
 flutter test
 cd ..

+cd "infinite_list"
+flutter test
+cd ..
+
 cd "isolate_example"
 flutter test
 cd ..
--- a/customer_testing.bat
+++ b/customer_testing.bat
@ -6,6 +6,10 @@ cd "flutter_maps_firestore"
 flutter test || exit 1
 cd ..

+cd "infinite_list"
+flutter test || exit 1
+cd ..
+
 cd "isolate_example"
 flutter test || exit 1
 cd ..
--- a/infinite_list/.gitignore
+++ b/infinite_list/.gitignore
@ -0,0 +1,73 @@
+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+
+# 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
+**/doc/api/
+.dart_tool/
+.flutter-plugins
+.packages
+.pub-cache/
+.pub/
+/build/
+
+# Android related
+**/android/**/gradle-wrapper.jar
+**/android/.gradle
+**/android/captures/
+**/android/gradlew
+**/android/gradlew.bat
+**/android/local.properties
+**/android/**/GeneratedPluginRegistrant.java
+
+# iOS/XCode related
+**/ios/**/*.mode1v3
+**/ios/**/*.mode2v3
+**/ios/**/*.moved-aside
+**/ios/**/*.pbxuser
+**/ios/**/*.perspectivev3
+**/ios/**/*sync/
+**/ios/**/.sconsign.dblite
+**/ios/**/.tags*
+**/ios/**/.vagrant/
+**/ios/**/DerivedData/
+**/ios/**/Icon?
+**/ios/**/Pods/
+**/ios/**/.symlinks/
+**/ios/**/profile
+**/ios/**/xcuserdata
+**/ios/.generated/
+**/ios/Flutter/App.framework
+**/ios/Flutter/Flutter.framework
+**/ios/Flutter/Generated.xcconfig
+**/ios/Flutter/app.flx
+**/ios/Flutter/app.zip
+**/ios/Flutter/flutter_assets/
+**/ios/Flutter/flutter_export_environment.sh
+**/ios/ServiceDefinitions.json
+**/ios/Runner/GeneratedPluginRegistrant.*
+
+# Exceptions to above rules.
+!**/ios/**/default.mode1v3
+!**/ios/**/default.mode2v3
+!**/ios/**/default.pbxuser
+!**/ios/**/default.perspectivev3
+!/packages/flutter_tools/test/data/dart_dependencies_test/**/.packages
--- a/infinite_list/README.md
+++ b/infinite_list/README.md
@ -0,0 +1,29 @@
+# infinite_list
+
+A Flutter sample app that shows an implementation of the "infinite list" UX pattern. That is,
+a list is shown to the user as if it was continuous although it is internally paginated.
+This is a common feature of mobile apps, from shopping catalogs through search engines
+to social media clients.
+
+![An animated gif of the app in action](https://user-images.githubusercontent.com/919717/81858860-3a1e3280-9519-11ea-8e9c-9d22ac1bf0ed.gif)
+
+This particular sample uses the [Provider][] package but any other state management approach
+would do.
+
+[Provider]: https://pub.dev/packages/provider
+
+## Goals for this sample
+
+* Show how UI code can be "shielded" from complex asynchrony and pagination logic using
+  a `ChangeNotifier`.
+* Illustrate use of `Selector` from the Provider package.
+
+## Questions/issues
+
+If you have a general question about Flutter, the best places to go are:
+
+* [Flutter documentation](https://flutter.dev/)
+* [StackOverflow](https://stackoverflow.com/questions/tagged/flutter)
+
+If you run into an issue with the sample itself, please
+[file an issue](https://github.com/flutter/samples/issues).
--- a/infinite_list/analysis_options.yaml
+++ b/infinite_list/analysis_options.yaml
@ -0,0 +1,31 @@
+include: package:pedantic/analysis_options.yaml
+
+analyzer:
+  strong-mode:
+    implicit-casts: false
+    implicit-dynamic: false
+
+linter:
+  rules:
+    - avoid_types_on_closure_parameters
+    - avoid_void_async
+    - await_only_futures
+    - camel_case_types
+    - cancel_subscriptions
+    - close_sinks
+    - constant_identifier_names
+    - control_flow_in_finally
+    - directives_ordering
+    - empty_statements
+    - hash_and_equals
+    - implementation_imports
+    - non_constant_identifier_names
+    - package_api_docs
+    - package_names
+    - package_prefixed_library_names
+    - test_types_in_equals
+    - throw_in_finally
+    - unnecessary_brace_in_string_interps
+    - unnecessary_getters_setters
+    - unnecessary_new
+    - unnecessary_statements
--- a/infinite_list/android/.gitignore
+++ b/infinite_list/android/.gitignore
@ -0,0 +1,7 @@
+gradle-wrapper.jar
+/.gradle
+/captures/
+/gradlew
+/gradlew.bat
+/local.properties
+GeneratedPluginRegistrant.java
--- a/infinite_list/android/app/build.gradle
+++ b/infinite_list/android/app/build.gradle
@ -0,0 +1,54 @@
+def localProperties = new Properties()
+def localPropertiesFile = rootProject.file('local.properties')
+if (localPropertiesFile.exists()) {
+    localPropertiesFile.withReader('UTF-8') { reader ->
+        localProperties.load(reader)
+    }
+}
+
+def flutterRoot = localProperties.getProperty('flutter.sdk')
+if (flutterRoot == null) {
+    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
+}
+
+def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
+if (flutterVersionCode == null) {
+    flutterVersionCode = '1'
+}
+
+def flutterVersionName = localProperties.getProperty('flutter.versionName')
+if (flutterVersionName == null) {
+    flutterVersionName = '1.0'
+}
+
+apply plugin: 'com.android.application'
+apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
+
+android {
+    compileSdkVersion 28
+
+    lintOptions {
+        disable 'InvalidPackage'
+    }
+
+    defaultConfig {
+        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
+        applicationId "dev.flutter.infinitelist"
+        minSdkVersion 16
+        targetSdkVersion 28
+        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 '../..'
+}
--- a/infinite_list/android/app/src/debug/AndroidManifest.xml
+++ b/infinite_list/android/app/src/debug/AndroidManifest.xml
@ -0,0 +1,7 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="dev.flutter.infinitelist">
+    <!-- Flutter needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>
--- a/infinite_list/android/app/src/main/AndroidManifest.xml
+++ b/infinite_list/android/app/src/main/AndroidManifest.xml
@ -0,0 +1,47 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="dev.flutter.infinitelist">
+    <!-- io.flutter.app.FlutterApplication is an android.app.Application that
+         calls FlutterMain.startInitialization(this); in its onCreate method.
+         In most cases you can leave this as-is, but you if you want to provide
+         additional functionality it is fine to subclass or reimplement
+         FlutterApplication and put your custom class here. -->
+    <application
+        android:name="io.flutter.app.FlutterApplication"
+        android:label="infinitelist"
+        android:icon="@mipmap/ic_launcher">
+        <activity
+            android:name=".MainActivity"
+            android:launchMode="singleTop"
+            android:theme="@style/LaunchTheme"
+            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
+            android:hardwareAccelerated="true"
+            android:windowSoftInputMode="adjustResize">
+            <!-- Specifies an Android theme to apply to this Activity as soon as
+                 the Android process has started. This theme is visible to the user
+                 while the Flutter UI initializes. After that, this theme continues
+                 to determine the Window background behind the Flutter UI. -->
+            <meta-data
+              android:name="io.flutter.embedding.android.NormalTheme"
+              android:resource="@style/NormalTheme"
+              />
+            <!-- Displays an Android View that continues showing the launch screen
+                 Drawable until Flutter paints its first frame, then this splash
+                 screen fades out. A splash screen is useful to avoid any visual
+                 gap between the end of Android's launch screen and the painting of
+                 Flutter's first frame. -->
+            <meta-data
+              android:name="io.flutter.embedding.android.SplashScreenDrawable"
+              android:resource="@drawable/launch_background"
+              />
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity>
+        <!-- Don't delete the meta-data below.
+             This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
+        <meta-data
+            android:name="flutterEmbedding"
+            android:value="2" />
+    </application>
+</manifest>
--- a/infinite_list/android/app/src/main/java/dev/flutter/infinitelist/MainActivity.java
+++ b/infinite_list/android/app/src/main/java/dev/flutter/infinitelist/MainActivity.java
@ -0,0 +1,6 @@
+package dev.flutter.infinitelist;
+
+import io.flutter.embedding.android.FlutterActivity;
+
+public class MainActivity extends FlutterActivity {
+}
--- a/infinite_list/android/app/src/main/res/drawable/launch_background.xml
+++ b/infinite_list/android/app/src/main/res/drawable/launch_background.xml
@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Modify this file to customize your launch splash screen -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="@android:color/white" />
+
+    <!-- You can insert your own image assets here -->
+    <!-- <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item> -->
+</layer-list>
--- a/infinite_list/android/app/src/main/res/mipmap-hdpi/ic_launcher.png
+++ b/infinite_list/android/app/src/main/res/mipmap-hdpi/ic_launcher.png
--- a/infinite_list/android/app/src/main/res/mipmap-mdpi/ic_launcher.png
+++ b/infinite_list/android/app/src/main/res/mipmap-mdpi/ic_launcher.png
--- a/infinite_list/android/app/src/main/res/mipmap-xhdpi/ic_launcher.png
+++ b/infinite_list/android/app/src/main/res/mipmap-xhdpi/ic_launcher.png
--- a/infinite_list/android/app/src/main/res/mipmap-xxhdpi/ic_launcher.png
+++ b/infinite_list/android/app/src/main/res/mipmap-xxhdpi/ic_launcher.png
--- a/infinite_list/android/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png
+++ b/infinite_list/android/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png
--- a/infinite_list/android/app/src/main/res/values/styles.xml
+++ b/infinite_list/android/app/src/main/res/values/styles.xml
@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Theme applied to the Android Window while the process is starting -->
+    <style name="LaunchTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <!-- Show a splash screen on the activity. Automatically removed when
+             Flutter draws its first frame -->
+        <item name="android:windowBackground">@drawable/launch_background</item>
+    </style>
+    <!-- Theme applied to the Android Window as soon as the process has started.
+         This theme determines the color of the Android Window while your
+         Flutter UI initializes, as well as behind your Flutter UI while its
+         running.
+         
+         This Theme is only used starting with V2 of Flutter's Android embedding. -->
+    <style name="NormalTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <item name="android:windowBackground">@android:color/white</item>
+    </style>
+</resources>
--- a/infinite_list/android/app/src/profile/AndroidManifest.xml
+++ b/infinite_list/android/app/src/profile/AndroidManifest.xml
@ -0,0 +1,7 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="dev.flutter.infinitelist">
+    <!-- Flutter needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>
--- a/infinite_list/android/build.gradle
+++ b/infinite_list/android/build.gradle
@ -0,0 +1,29 @@
+buildscript {
+    repositories {
+        google()
+        jcenter()
+    }
+
+    dependencies {
+        classpath 'com.android.tools.build:gradle:3.5.0'
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        jcenter()
+    }
+}
+
+rootProject.buildDir = '../build'
+subprojects {
+    project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
+    project.evaluationDependsOn(':app')
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}
--- a/infinite_list/android/gradle.properties
+++ b/infinite_list/android/gradle.properties
@ -0,0 +1,4 @@
+org.gradle.jvmargs=-Xmx1536M
+android.enableR8=true
+android.useAndroidX=true
+android.enableJetifier=true
--- a/infinite_list/android/gradle/wrapper/gradle-wrapper.properties
+++ b/infinite_list/android/gradle/wrapper/gradle-wrapper.properties
@ -0,0 +1,6 @@
+#Fri Jun 23 08:50:38 CEST 2017
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.2-all.zip
--- a/infinite_list/android/settings.gradle
+++ b/infinite_list/android/settings.gradle
@ -0,0 +1,15 @@
+include ':app'
+
+def flutterProjectRoot = rootProject.projectDir.parentFile.toPath()
+
+def plugins = new Properties()
+def pluginsFile = new File(flutterProjectRoot.toFile(), '.flutter-plugins')
+if (pluginsFile.exists()) {
+    pluginsFile.withReader('UTF-8') { reader -> plugins.load(reader) }
+}
+
+plugins.each { name, path ->
+    def pluginDirectory = flutterProjectRoot.resolve(path).resolve('android').toFile()
+    include ":$name"
+    project(":$name").projectDir = pluginDirectory
+}
--- a/infinite_list/ios/.gitignore
+++ b/infinite_list/ios/.gitignore
@ -0,0 +1,32 @@
+*.mode1v3
+*.mode2v3
+*.moved-aside
+*.pbxuser
+*.perspectivev3
+**/*sync/
+.sconsign.dblite
+.tags*
+**/.vagrant/
+**/DerivedData/
+Icon?
+**/Pods/
+**/.symlinks/
+profile
+xcuserdata
+**/.generated/
+Flutter/App.framework
+Flutter/Flutter.framework
+Flutter/Flutter.podspec
+Flutter/Generated.xcconfig
+Flutter/app.flx
+Flutter/app.zip
+Flutter/flutter_assets/
+Flutter/flutter_export_environment.sh
+ServiceDefinitions.json
+Runner/GeneratedPluginRegistrant.*
+
+# Exceptions to above rules.
+!default.mode1v3
+!default.mode2v3
+!default.pbxuser
+!default.perspectivev3
--- a/infinite_list/ios/Flutter/AppFrameworkInfo.plist
+++ b/infinite_list/ios/Flutter/AppFrameworkInfo.plist
@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+  <key>CFBundleDevelopmentRegion</key>
+  <string>$(DEVELOPMENT_LANGUAGE)</string>
+  <key>CFBundleExecutable</key>
+  <string>App</string>
+  <key>CFBundleIdentifier</key>
+  <string>io.flutter.flutter.app</string>
+  <key>CFBundleInfoDictionaryVersion</key>
+  <string>6.0</string>
+  <key>CFBundleName</key>
+  <string>App</string>
+  <key>CFBundlePackageType</key>
+  <string>FMWK</string>
+  <key>CFBundleShortVersionString</key>
+  <string>1.0</string>
+  <key>CFBundleSignature</key>
+  <string>????</string>
+  <key>CFBundleVersion</key>
+  <string>1.0</string>
+  <key>MinimumOSVersion</key>
+  <string>8.0</string>
+</dict>
+</plist>
--- a/infinite_list/ios/Flutter/Debug.xcconfig
+++ b/infinite_list/ios/Flutter/Debug.xcconfig
@ -0,0 +1 @@
+#include "Generated.xcconfig"
--- a/infinite_list/ios/Flutter/Release.xcconfig
+++ b/infinite_list/ios/Flutter/Release.xcconfig
@ -0,0 +1 @@
+#include "Generated.xcconfig"
--- a/infinite_list/ios/Runner.xcodeproj/project.pbxproj
+++ b/infinite_list/ios/Runner.xcodeproj/project.pbxproj
@ -0,0 +1,499 @@
+// !$*UTF8*$!
+{
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+	classes = {
+	};
+	objectVersion = 46;
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+			dstPath = "";
+			dstSubfolderSpec = 10;
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--- a/infinite_list/ios/Runner.xcodeproj/project.xcworkspace/contents.xcworkspacedata
+++ b/infinite_list/ios/Runner.xcodeproj/project.xcworkspace/contents.xcworkspacedata
@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "group:Runner.xcodeproj">
+   </FileRef>
+</Workspace>
--- a/infinite_list/ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
+++ b/infinite_list/ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>
--- a/infinite_list/ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings
+++ b/infinite_list/ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings
@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>PreviewsEnabled</key>
+	<false/>
+</dict>
+</plist>
--- a/infinite_list/ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme
+++ b/infinite_list/ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme
@ -0,0 +1,91 @@
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+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Runner.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Profile"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Runner.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>
--- a/infinite_list/ios/Runner.xcworkspace/contents.xcworkspacedata
+++ b/infinite_list/ios/Runner.xcworkspace/contents.xcworkspacedata
@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "group:Runner.xcodeproj">
+   </FileRef>
+</Workspace>
--- a/infinite_list/ios/Runner.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
+++ b/infinite_list/ios/Runner.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>
--- a/infinite_list/ios/Runner.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings
+++ b/infinite_list/ios/Runner.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings
@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>PreviewsEnabled</key>
+	<false/>
+</dict>
+</plist>
--- a/infinite_list/ios/Runner/AppDelegate.h
+++ b/infinite_list/ios/Runner/AppDelegate.h
@ -0,0 +1,6 @@
+#import <Flutter/Flutter.h>
+#import <UIKit/UIKit.h>
+
+@interface AppDelegate : FlutterAppDelegate
+
+@end
--- a/infinite_list/ios/Runner/AppDelegate.m
+++ b/infinite_list/ios/Runner/AppDelegate.m
@ -0,0 +1,13 @@
+#import "AppDelegate.h"
+#import "GeneratedPluginRegistrant.h"
+
+@implementation AppDelegate
+
+- (BOOL)application:(UIApplication *)application
+    didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
+  [GeneratedPluginRegistrant registerWithRegistry:self];
+  // Override point for customization after application launch.
+  return [super application:application didFinishLaunchingWithOptions:launchOptions];
+}
+
+@end
--- a/infinite_list/ios/Runner/Assets.xcassets/AppIcon.appiconset/Contents.json
+++ b/infinite_list/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"
+  }
+}
--- a/infinite_list/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-1024x1024@1x.png
+++ b/infinite_list/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-1024x1024@1x.png
--- a/infinite_list/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-20x20@1x.png
+++ b/infinite_list/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-20x20@1x.png
--- a/infinite_list/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-20x20@2x.png
+++ b/infinite_list/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-20x20@2x.png
--- a/infinite_list/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-20x20@3x.png
+++ b/infinite_list/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-20x20@3x.png
--- a/infinite_list/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-29x29@1x.png
+++ b/infinite_list/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-29x29@1x.png
--- a/infinite_list/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-29x29@2x.png
+++ b/infinite_list/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-29x29@2x.png
--- a/infinite_list/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-29x29@3x.png
+++ b/infinite_list/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-29x29@3x.png
--- a/infinite_list/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-40x40@1x.png
+++ b/infinite_list/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-40x40@1x.png
--- a/infinite_list/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-40x40@2x.png
+++ b/infinite_list/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-40x40@2x.png
--- a/infinite_list/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-40x40@3x.png
+++ b/infinite_list/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-40x40@3x.png
--- a/infinite_list/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-60x60@2x.png
+++ b/infinite_list/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-60x60@2x.png
--- a/infinite_list/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-60x60@3x.png
+++ b/infinite_list/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-60x60@3x.png
--- a/infinite_list/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-76x76@1x.png
+++ b/infinite_list/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-76x76@1x.png
--- a/infinite_list/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-76x76@2x.png
+++ b/infinite_list/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-76x76@2x.png
--- a/infinite_list/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-83.5x83.5@2x.png
+++ b/infinite_list/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-83.5x83.5@2x.png
--- a/infinite_list/ios/Runner/Assets.xcassets/LaunchImage.imageset/Contents.json
+++ b/infinite_list/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"
+  }
+}
--- a/infinite_list/ios/Runner/Assets.xcassets/LaunchImage.imageset/LaunchImage.png
+++ b/infinite_list/ios/Runner/Assets.xcassets/LaunchImage.imageset/LaunchImage.png
--- a/infinite_list/ios/Runner/Assets.xcassets/LaunchImage.imageset/LaunchImage@2x.png
+++ b/infinite_list/ios/Runner/Assets.xcassets/LaunchImage.imageset/LaunchImage@2x.png
--- a/infinite_list/ios/Runner/Assets.xcassets/LaunchImage.imageset/LaunchImage@3x.png
+++ b/infinite_list/ios/Runner/Assets.xcassets/LaunchImage.imageset/LaunchImage@3x.png
--- a/infinite_list/ios/Runner/Assets.xcassets/LaunchImage.imageset/README.md
+++ b/infinite_list/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.
--- a/infinite_list/ios/Runner/Base.lproj/LaunchScreen.storyboard
+++ b/infinite_list/ios/Runner/Base.lproj/LaunchScreen.storyboard
@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="12121" systemVersion="16G29" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="12089"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="Ydg-fD-yQy"/>
+                        <viewControllerLayoutGuide type="bottom" id="xbc-2k-c8Z"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <imageView opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" image="LaunchImage" translatesAutoresizingMaskIntoConstraints="NO" id="YRO-k0-Ey4">
+                            </imageView>
+                        </subviews>
+                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                        <constraints>
+                            <constraint firstItem="YRO-k0-Ey4" firstAttribute="centerX" secondItem="Ze5-6b-2t3" secondAttribute="centerX" id="1a2-6s-vTC"/>
+                            <constraint firstItem="YRO-k0-Ey4" firstAttribute="centerY" secondItem="Ze5-6b-2t3" secondAttribute="centerY" id="4X2-HB-R7a"/>
+                        </constraints>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="53" y="375"/>
+        </scene>
+    </scenes>
+    <resources>
+        <image name="LaunchImage" width="168" height="185"/>
+    </resources>
+</document>
--- a/infinite_list/ios/Runner/Base.lproj/Main.storyboard
+++ b/infinite_list/ios/Runner/Base.lproj/Main.storyboard
@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="10117" systemVersion="15F34" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="BYZ-38-t0r">
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="10085"/>
+    </dependencies>
+    <scenes>
+        <!--Flutter View Controller-->
+        <scene sceneID="tne-QT-ifu">
+            <objects>
+                <viewController id="BYZ-38-t0r" customClass="FlutterViewController" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="y3c-jy-aDJ"/>
+                        <viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
+                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
+            </objects>
+        </scene>
+    </scenes>
+</document>
--- a/infinite_list/ios/Runner/Info.plist
+++ b/infinite_list/ios/Runner/Info.plist
@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>infinitelist</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>$(FLUTTER_BUILD_NAME)</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>$(FLUTTER_BUILD_NUMBER)</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>UILaunchStoryboardName</key>
+	<string>LaunchScreen</string>
+	<key>UIMainStoryboardFile</key>
+	<string>Main</string>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UIViewControllerBasedStatusBarAppearance</key>
+	<false/>
+</dict>
+</plist>
--- a/infinite_list/ios/Runner/main.m
+++ b/infinite_list/ios/Runner/main.m
@ -0,0 +1,9 @@
+#import <Flutter/Flutter.h>
+#import <UIKit/UIKit.h>
+#import "AppDelegate.h"
+
+int main(int argc, char* argv[]) {
+  @autoreleasepool {
+    return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
+  }
+}
--- a/infinite_list/lib/main.dart
+++ b/infinite_list/lib/main.dart
@ -0,0 +1,66 @@
+// Copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+
+import 'src/catalog.dart';
+import 'src/item_tile.dart';
+
+void main() {
+  runApp(MyApp());
+}
+
+class MyApp extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return ChangeNotifierProvider<Catalog>(
+      create: (context) => Catalog(),
+      child: MaterialApp(
+        title: 'Infinite List Sample',
+        home: MyHomePage(),
+      ),
+    );
+  }
+}
+
+class MyHomePage extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text('Infinite List Sample'),
+      ),
+      body: Selector<Catalog, int>(
+        // Selector is a widget from package:provider. It allows us to listen
+        // to only one aspect of a provided value. In this case, we are only
+        // listening to the catalog's `itemCount`, because that's all we need
+        // at this level.
+        selector: (context, catalog) => catalog.itemCount,
+        builder: (context, itemCount, child) => ListView.builder(
+          // When `itemCount` is null, `ListView` assumes an infinite list.
+          // Once we provide a value, it will stop the scrolling beyond
+          // the last element.
+          itemCount: itemCount,
+          padding: const EdgeInsets.symmetric(vertical: 18),
+          itemBuilder: (context, index) {
+            // Every item of the `ListView` is individually listening
+            // to the catalog.
+            var catalog = Provider.of<Catalog>(context);
+
+            // Catalog provides a single synchronous method for getting
+            // the current data.
+            var item = catalog.getByIndex(index);
+
+            if (item.isLoading) {
+              return LoadingItemTile();
+            }
+
+            return ItemTile(item: item);
+          },
+        ),
+      ),
+    );
+  }
+}
--- a/infinite_list/lib/src/api/fetch.dart
+++ b/infinite_list/lib/src/api/fetch.dart
@ -0,0 +1,43 @@
+// Copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+import 'item.dart';
+import 'page.dart';
+
+const catalogLength = 200;
+
+/// This function emulates a REST API call. You can imagine replacing its
+/// contents with an actual network call, keeping the signature the same.
+///
+/// It will fetch a page of items from [startingIndex].
+Future<ItemPage> fetchPage(int startingIndex) async {
+  // We're emulating the delay inherent to making a network call.
+  await Future<void>.delayed(const Duration(milliseconds: 500));
+
+  // If the [startingIndex] is beyond the bounds of the catalog, an
+  // empty page will be returned.
+  if (startingIndex > catalogLength) {
+    return ItemPage(
+      items: [],
+      startingIndex: startingIndex,
+      hasNext: false,
+    );
+  }
+
+  // The page of items is generated here.
+  return ItemPage(
+    items: List.generate(
+        itemsPerPage,
+        (index) => Item(
+              color: Colors.primaries[index % Colors.primaries.length],
+              name: 'Color #${startingIndex + index}',
+              price: 50 + (index * 42) % 200,
+            )),
+    startingIndex: startingIndex,
+    // Returns `false` if we've reached the [catalogLength].
+    hasNext: startingIndex + itemsPerPage < catalogLength,
+  );
+}
--- a/infinite_list/lib/src/api/item.dart
+++ b/infinite_list/lib/src/api/item.dart
@ -0,0 +1,23 @@
+// Copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+class Item {
+  final Color color;
+
+  final int price;
+
+  final String name;
+
+  Item({
+    @required this.color,
+    @required this.name,
+    @required this.price,
+  });
+
+  Item.loading() : this(color: Colors.grey, name: '...', price: 0);
+
+  bool get isLoading => name == '...';
+}
--- a/infinite_list/lib/src/api/page.dart
+++ b/infinite_list/lib/src/api/page.dart
@ -0,0 +1,24 @@
+// Copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+import 'package:meta/meta.dart';
+
+import 'item.dart';
+
+const int itemsPerPage = 20;
+
+class ItemPage {
+  final List<Item> items;
+
+  final int startingIndex;
+
+  final bool hasNext;
+
+  ItemPage({
+    @required this.items,
+    @required this.startingIndex,
+    @required this.hasNext,
+  });
+}
--- a/infinite_list/lib/src/catalog.dart
+++ b/infinite_list/lib/src/catalog.dart
@ -0,0 +1,120 @@
+// Copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+
+import 'api/fetch.dart';
+import 'api/item.dart';
+import 'api/page.dart';
+
+/// The [Catalog] holds items in memory, provides a synchronous access
+/// to them via [getByIndex], and notifies listeners when there is any change.
+class Catalog extends ChangeNotifier {
+  /// This is the maximum number of the items we want in memory in each
+  /// direction from the current position. For example, if the user
+  /// is currently looking at item number 400, we don't want item number
+  /// 0 to be kept in memory.
+  static const maxCacheDistance = 100;
+
+  /// The internal store of pages that we got from [fetchPage].
+  /// The key of the map is the starting index of the page, for faster
+  /// access.
+  final Map<int, ItemPage> _pages = {};
+
+  /// A set of pages (represented by their starting index) that have started
+  /// the fetch process but haven't ended it yet.
+  ///
+  /// This is to prevent fetching of a page several times in a row. When a page
+  /// is already being fetched, we don't initiate another fetch request.
+  final Set<int> _pagesBeingFetched = {};
+
+  /// The size of the catalog. This is `null` at first, and only when the user
+  /// reaches the end of the catalog, it will hold the actual number.
+  int itemCount;
+
+  /// After the catalog is disposed, we don't allow it to call
+  /// [notifyListeners].
+  bool _isDisposed = false;
+
+  @override
+  void dispose() {
+    _isDisposed = true;
+    super.dispose();
+  }
+
+  /// This is a synchronous method that returns the item at [index].
+  ///
+  /// If the item is already in memory, this will just return it. Otherwise,
+  /// this method will initiate a fetch of the corresponding page, and will
+  /// return [Item.loading].
+  ///
+  /// The UI will be notified via [notifyListeners] when the fetch
+  /// is completed. At that time, calling this method will return the newly
+  /// fetched item.
+  Item getByIndex(int index) {
+    // Compute the starting index of the page where this item is located.
+    // For example, if [index] is `42` and [itemsPerPage] is `20`,
+    // then `index ~/ itemsPerPage` (integer division)
+    // evaluates to `2`, and `2 * 20` is `40`.
+    var startingIndex = (index ~/ itemsPerPage) * itemsPerPage;
+
+    // If the corresponding page is already in memory, return immediately.
+    if (_pages.containsKey(startingIndex)) {
+      var item = _pages[startingIndex].items[index - startingIndex];
+      return item;
+    }
+
+    // We don't have the data yet. Start fetching it.
+    _fetchPage(startingIndex);
+
+    // In the meantime, return a placeholder.
+    return Item.loading();
+  }
+
+  /// This method initiates fetching of the [ItemPage] at [startingIndex].
+  Future<void> _fetchPage(int startingIndex) async {
+    if (_pagesBeingFetched.contains(startingIndex)) {
+      // Page is already being fetched. Ignore the redundant call.
+      return;
+    }
+
+    _pagesBeingFetched.add(startingIndex);
+    final page = await fetchPage(startingIndex);
+    _pagesBeingFetched.remove(startingIndex);
+
+    if (!page.hasNext) {
+      // The returned page has no next page. This means we now know the size
+      // of the catalog.
+      itemCount = startingIndex + page.items.length;
+    }
+
+    // Store the new page.
+    _pages[startingIndex] = page;
+    _pruneCache(startingIndex);
+
+    if (!_isDisposed) {
+      // Notify the widgets that are listening to the catalog that they
+      // should rebuild.
+      notifyListeners();
+    }
+  }
+
+  /// Removes item pages that are too far away from [currentStartingIndex].
+  void _pruneCache(int currentStartingIndex) {
+    // It's bad practice to modify collections while iterating over them.
+    // So instead, we'll store the keys to remove in a separate Set.
+    final keysToRemove = <int>{};
+    for (final key in _pages.keys) {
+      if ((key - currentStartingIndex).abs() > maxCacheDistance) {
+        // This page's starting index is too far away from the current one.
+        // We'll remove it.
+        keysToRemove.add(key);
+      }
+    }
+    for (final key in keysToRemove) {
+      _pages.remove(key);
+    }
+  }
+}
--- a/infinite_list/lib/src/item_tile.dart
+++ b/infinite_list/lib/src/item_tile.dart
@ -0,0 +1,53 @@
+// Copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+import 'api/item.dart';
+
+/// This is the widget responsible for building the item in the list,
+/// once we have the actual data [item].
+class ItemTile extends StatelessWidget {
+  final Item item;
+
+  ItemTile({@required this.item, Key key}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return Padding(
+      padding: const EdgeInsets.all(8.0),
+      child: ListTile(
+        leading: AspectRatio(
+          aspectRatio: 1,
+          child: Container(
+            color: item.color,
+          ),
+        ),
+        title: Text(item.name, style: Theme.of(context).textTheme.headline6),
+        trailing: Text('\$ ${(item.price / 100).toStringAsFixed(2)}'),
+      ),
+    );
+  }
+}
+
+/// This is the widget responsible for building the "still loading" item
+/// in the list (represented with "..." and a crossed square).
+class LoadingItemTile extends StatelessWidget {
+  const LoadingItemTile({Key key}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return Padding(
+      padding: const EdgeInsets.all(8.0),
+      child: ListTile(
+        leading: AspectRatio(
+          aspectRatio: 1,
+          child: Placeholder(),
+        ),
+        title: Text('...', style: Theme.of(context).textTheme.headline6),
+        trailing: Text('\$ ...'),
+      ),
+    );
+  }
+}
--- a/infinite_list/pubspec.lock
+++ b/infinite_list/pubspec.lock
@ -0,0 +1,210 @@
+# Generated by pub
+# See https://dart.dev/tools/pub/glossary#lockfile
+packages:
+  archive:
+    dependency: transitive
+    description:
+      name: archive
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.13"
+  args:
+    dependency: transitive
+    description:
+      name: args
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.6.0"
+  async:
+    dependency: transitive
+    description:
+      name: async
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.4.1"
+  boolean_selector:
+    dependency: transitive
+    description:
+      name: boolean_selector
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.0"
+  charcode:
+    dependency: transitive
+    description:
+      name: charcode
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.1.3"
+  collection:
+    dependency: transitive
+    description:
+      name: collection
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.14.12"
+  convert:
+    dependency: transitive
+    description:
+      name: convert
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.1"
+  crypto:
+    dependency: transitive
+    description:
+      name: crypto
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.4"
+  cupertino_icons:
+    dependency: "direct main"
+    description:
+      name: cupertino_icons
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.1.3"
+  flutter:
+    dependency: "direct main"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  flutter_test:
+    dependency: "direct dev"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  image:
+    dependency: transitive
+    description:
+      name: image
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.12"
+  matcher:
+    dependency: transitive
+    description:
+      name: matcher
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.12.6"
+  meta:
+    dependency: "direct main"
+    description:
+      name: meta
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.1.8"
+  nested:
+    dependency: transitive
+    description:
+      name: nested
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.0.4"
+  path:
+    dependency: transitive
+    description:
+      name: path
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.6.4"
+  pedantic:
+    dependency: "direct dev"
+    description:
+      name: pedantic
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.9.0"
+  petitparser:
+    dependency: transitive
+    description:
+      name: petitparser
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.4.0"
+  provider:
+    dependency: "direct main"
+    description:
+      name: provider
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "4.0.5"
+  quiver:
+    dependency: transitive
+    description:
+      name: quiver
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.3"
+  sky_engine:
+    dependency: transitive
+    description: flutter
+    source: sdk
+    version: "0.0.99"
+  source_span:
+    dependency: transitive
+    description:
+      name: source_span
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.7.0"
+  stack_trace:
+    dependency: transitive
+    description:
+      name: stack_trace
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.9.3"
+  stream_channel:
+    dependency: transitive
+    description:
+      name: stream_channel
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.0"
+  string_scanner:
+    dependency: transitive
+    description:
+      name: string_scanner
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.5"
+  term_glyph:
+    dependency: transitive
+    description:
+      name: term_glyph
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.1.0"
+  test_api:
+    dependency: transitive
+    description:
+      name: test_api
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.2.15"
+  typed_data:
+    dependency: transitive
+    description:
+      name: typed_data
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.1.6"
+  vector_math:
+    dependency: transitive
+    description:
+      name: vector_math
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.8"
+  xml:
+    dependency: transitive
+    description:
+      name: xml
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.6.1"
+sdks:
+  dart: ">=2.6.0 <3.0.0"
+  flutter: ">=1.12.1"
--- a/infinite_list/pubspec.yaml
+++ b/infinite_list/pubspec.yaml
@ -0,0 +1,25 @@
+name: infinitelist
+description: >
+  A sample implementation of an infinite list.
+
+version: 1.0.0+1
+
+environment:
+  sdk: ">=2.6.0 <3.0.0"
+
+dependencies:
+  flutter:
+    sdk: flutter
+
+  cupertino_icons: ^0.1.3
+  meta: ^1.1.8
+  provider: ^4.0.0
+
+dev_dependencies:
+  flutter_test:
+    sdk: flutter
+
+  pedantic: ^1.9.0
+
+flutter:
+  uses-material-design: true
--- a/infinite_list/test/smoke_test.dart
+++ b/infinite_list/test/smoke_test.dart
@ -0,0 +1,40 @@
+// Copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+import 'package:infinitelist/main.dart';
+
+void main() {
+  testWidgets('Infinite list smoke test', (tester) async {
+    await tester.pumpWidget(MyApp());
+
+    const loadingDuration = Duration(milliseconds: 500);
+
+    // At first, the catalog shows only "..." (loading items).
+    expect(find.text('...'), findsWidgets);
+    expect(find.text('Color #1'), findsNothing);
+
+    await tester.pump(loadingDuration);
+
+    // After the app has had a chance to load items, it should no longer
+    // show "...".
+    expect(find.text('...'), findsNothing);
+    expect(find.text('Color #1'), findsOneWidget);
+
+    // Flinging up quickly (i.e. scrolling down).
+    await tester.fling(find.byType(ListView), Offset(0, -2000), 5000);
+
+    // As we scroll down, we should see more items loading.
+    expect(find.text('...'), findsWidgets);
+    // The item at the top should no longer be in view.
+    expect(find.text('Color #1'), findsNothing);
+
+    // This last part is just giving the app time to complete its "fetch"
+    // of new items. Otherwise, the test fails because of outstanding
+    // asynchronous callbacks.
+    await tester.pump(loadingDuration);
+  });
+}
--- a/tool/travis_flutter_script.sh
+++ b/tool/travis_flutter_script.sh
@ -30,6 +30,7 @@ declare -ar PROJECT_NAMES=(
    "add_to_app/flutter_module_using_plugin" \
    "animations" \
    "flutter_maps_firestore" \
+    "infinite_list" \
    "isolate_example" \
    "jsonexample" \
    "place_tracker" \