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.
pull/445/head
Filip Hracek 5 years ago committed by GitHub
parent baa1f976b2
commit 1d8cfa11c5
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@ -101,6 +101,12 @@ A collection of animation examples. The app starts with basic concepts like
`AnimationController` and `Tween`, then progresses to transitions and `AnimationController` and `Tween`, then progresses to transitions and
advanced demos. 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 ## Maps
#### [Place tracker](place_tracker) _(Flutter team)_ #### [Place tracker](place_tracker) _(Flutter team)_

@ -10,6 +10,7 @@ match any new language/SDK features, etc.).
| chrome-os-best-practices | | | | chrome-os-best-practices | | |
| experimental | | | | experimental | | |
| flutter_maps_firestore | | | | flutter_maps_firestore | | |
| infinite_list | filiph | 5/13/20 |
| isolate_example | johnpryan | 11/21/19 | | isolate_example | johnpryan | 11/21/19 |
| jsonexample | redbrogdon | 1/3/20 | | jsonexample | redbrogdon | 1/3/20 |
| material_studies/shrine | | | | material_studies/shrine | | |

@ -9,6 +9,10 @@ cd "flutter_maps_firestore"
flutter test flutter test
cd .. cd ..
cd "infinite_list"
flutter test
cd ..
cd "isolate_example" cd "isolate_example"
flutter test flutter test
cd .. cd ..

@ -6,6 +6,10 @@ cd "flutter_maps_firestore"
flutter test || exit 1 flutter test || exit 1
cd .. cd ..
cd "infinite_list"
flutter test || exit 1
cd ..
cd "isolate_example" cd "isolate_example"
flutter test || exit 1 flutter test || exit 1
cd .. cd ..

@ -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

@ -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).

@ -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

@ -0,0 +1,7 @@
gradle-wrapper.jar
/.gradle
/captures/
/gradlew
/gradlew.bat
/local.properties
GeneratedPluginRegistrant.java

@ -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 '../..'
}

@ -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>

@ -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>

@ -0,0 +1,6 @@
package dev.flutter.infinitelist;
import io.flutter.embedding.android.FlutterActivity;
public class MainActivity extends FlutterActivity {
}

@ -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>

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@ -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>

@ -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>

@ -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
}

@ -0,0 +1,4 @@
org.gradle.jvmargs=-Xmx1536M
android.enableR8=true
android.useAndroidX=true
android.enableJetifier=true

@ -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

@ -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
}

@ -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

@ -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>

@ -0,0 +1 @@
#include "Generated.xcconfig"

@ -0,0 +1 @@
#include "Generated.xcconfig"

@ -0,0 +1,499 @@
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@ -0,0 +1,7 @@
<?xml version="1.0" encoding="UTF-8"?>
<Workspace
version = "1.0">
<FileRef
location = "group:Runner.xcodeproj">
</FileRef>
</Workspace>

@ -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>

@ -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>

@ -0,0 +1,91 @@
<?xml version="1.0" encoding="UTF-8"?>
<Scheme
LastUpgradeVersion = "1020"
version = "1.3">
<BuildAction
parallelizeBuildables = "YES"
buildImplicitDependencies = "YES">
<BuildActionEntries>
<BuildActionEntry
buildForTesting = "YES"
buildForRunning = "YES"
buildForProfiling = "YES"
buildForArchiving = "YES"
buildForAnalyzing = "YES">
<BuildableReference
BuildableIdentifier = "primary"
BlueprintIdentifier = "97C146ED1CF9000F007C117D"
BuildableName = "Runner.app"
BlueprintName = "Runner"
ReferencedContainer = "container:Runner.xcodeproj">
</BuildableReference>
</BuildActionEntry>
</BuildActionEntries>
</BuildAction>
<TestAction
buildConfiguration = "Debug"
selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
shouldUseLaunchSchemeArgsEnv = "YES">
<Testables>
</Testables>
<MacroExpansion>
<BuildableReference
BuildableIdentifier = "primary"
BlueprintIdentifier = "97C146ED1CF9000F007C117D"
BuildableName = "Runner.app"
BlueprintName = "Runner"
ReferencedContainer = "container:Runner.xcodeproj">
</BuildableReference>
</MacroExpansion>
<AdditionalOptions>
</AdditionalOptions>
</TestAction>
<LaunchAction
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">
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BuildableIdentifier = "primary"
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BuildableName = "Runner.app"
BlueprintName = "Runner"
ReferencedContainer = "container:Runner.xcodeproj">
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<AdditionalOptions>
</AdditionalOptions>
</LaunchAction>
<ProfileAction
buildConfiguration = "Profile"
shouldUseLaunchSchemeArgsEnv = "YES"
savedToolIdentifier = ""
useCustomWorkingDirectory = "NO"
debugDocumentVersioning = "YES">
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runnableDebuggingMode = "0">
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<AnalyzeAction
buildConfiguration = "Debug">
</AnalyzeAction>
<ArchiveAction
buildConfiguration = "Release"
revealArchiveInOrganizer = "YES">
</ArchiveAction>
</Scheme>

@ -0,0 +1,7 @@
<?xml version="1.0" encoding="UTF-8"?>
<Workspace
version = "1.0">
<FileRef
location = "group:Runner.xcodeproj">
</FileRef>
</Workspace>

@ -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>

@ -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>

@ -0,0 +1,6 @@
#import <Flutter/Flutter.h>
#import <UIKit/UIKit.h>
@interface AppDelegate : FlutterAppDelegate
@end

@ -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

@ -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"
}
}

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@ -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"
}
}

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@ -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.

@ -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>

@ -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>

@ -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>

@ -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]));
}
}

@ -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);
},
),
),
);
}
}

@ -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,
);
}

@ -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 == '...';
}

@ -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,
});
}

@ -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);
}
}
}

@ -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('\$ ...'),
),
);
}
}

@ -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"

@ -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

@ -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);
});
}

@ -30,6 +30,7 @@ declare -ar PROJECT_NAMES=(
"add_to_app/flutter_module_using_plugin" \ "add_to_app/flutter_module_using_plugin" \
"animations" \ "animations" \
"flutter_maps_firestore" \ "flutter_maps_firestore" \
"infinite_list" \
"isolate_example" \ "isolate_example" \
"jsonexample" \ "jsonexample" \
"place_tracker" \ "place_tracker" \

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