IntroductionScreen

Introduction screen allow you to have a screen at launcher for example, where you can explain your app. This Widget is very customizable with a great design.

Introduction_screen use another package, dots_indicator, that I also created.

Installation

You just need to add introduction_screen as a dependency in your pubspec.yaml file.

dependencies:
  introduction_screen: ^3.0.1

Example

Many parameters are available, in next section of example all are not listed. To see all parameters available please check end of README. If you want to display IntroductionScreen only once (e.g: first start of your app), use SharedPreferences (or similar) to save status (already display or not). It's not responsability of this package to handle this.

In these example, listPagesViewModel is the list of pages. A page is base on PageViewModel. See example of a PageViewModel below.

PageViewModel

Simple page

This example only defines title, body and an image (you can define any widget)

PageViewModel(
  title: "Title of first page",
  body: "Here you can write the description of the page, to explain someting...",
  image: Center(
    child: Image.network("https://domaine.com/image.png", height: 175.0),
  ),
)

Page with custom colors

This example shows you how to define the color of the page

PageViewModel(
  title: "Title of first page",
  body: "Here you can write the description of the page, to explain someting...",
  image: Center(child: Image.asset("res/images/logo.png", height: 175.0)),
  decoration: const PageDecoration(
    pageColor: Colors.blue,
  ),
)

Page with custom text style

This example shows you how to define another TextStyle for the title and the body

PageViewModel(
  title: "Title of first page",
  body: "Here you can write the description of the page, to explain someting...",
  image: const Center(child: Icon(Icons.android)),
  decoration: const PageDecoration(
    titleTextStyle: TextStyle(color: Colors.orange),
    bodyTextStyle: TextStyle(fontWeight: FontWeight.w700, fontSize: 20.0),
  ),
)

Page with a footer, like a button

This example shows you how to define a page with a footer, like a Button

PageViewModel(
  title: "Title of first page",
  body: "Here you can write the description of the page, to explain someting...",
  image: const Center(child: Icon(Icons.android)),
  footer: ElevatedButton(
    onPressed: () {
      // On button presed
    },
    child: const Text("Let's Go !"),
  ),
);

Page with widget body

This example shows you how to define a page with a body as Widget and not a simple String You can to the same this for title, with titleWidget parameter.

PageViewModel(
  title: "Title of first page",
  bodyWidget: Row(
    mainAxisAlignment: MainAxisAlignment.center,
    children: const [
      Text("Click on "),
      Icon(Icons.edit),
      Text(" to edit a post"),
    ],
  ),
  image: const Center(child: Icon(Icons.android)),
);

IntroductionScreen

Note :

If you not provide next parameter, the Next button will be not displayed. If you want to display a skip button, you must add skip parameter and showSkipButton: true.

The done parameter is required only if showDoneButton: true.

Simple intro screen

Simple intro screen

IntroductionScreen(
  pages: listPagesViewModel,
  done: const Text("Done", style: TextStyle(fontWeight: FontWeight.w600)),
  onDone: () {
    // When done button is press
  },
); //Material App

Intro screen with skip button

IntroductionScreen(
  pages: listPagesViewModel,
  onDone: () {
    // When done button is press
  },
  showBackButton: false,
  showSkipButton: true,
  skip: const Text("Skip"),
  done: const Text("Done", style: TextStyle(fontWeight: FontWeight.w600)),
);

Intro screen with back button

note: back button is not visible on first page for better UX

IntroductionScreen(
  pages: listPagesViewModel,
  onDone: () {
    // When done button is press
  },
  showBackButton: true,
  showSkipButton: false,
  back: const Icon(Icons.arrow_back),
  done: const Text("Done", style: TextStyle(fontWeight: FontWeight.w600)),
);

Intro screen with custom button text and dots indicators

IntroductionScreen(
  pages: listPagesViewModel,
  onDone: () {
    // When done button is press
  },
  onSkip: () {
    // You can also override onSkip callback
  },
  showBackButton: false
  showSkipButton: true,
  skip: const Icon(Icons.skip_next),
  next: const Icon(Icons.next),
  done: const Text("Done", style: TextStyle(fontWeight: FontWeight.w600)),
  dotsDecorator: DotsDecorator(
    size: const Size.square(10.0),
    activeSize: const Size(20.0, 10.0),
    activeColor: theme.accentColor,
    color: Colors.black26,
    spacing: const EdgeInsets.symmetric(horizontal: 3.0),
    activeShape: RoundedRectangleBorder(
      borderRadius: BorderRadius.circular(25.0)
    )
  ),
);

Intro screen with custom button style

You can provide a baseBtnStyle, that will apply a style on all buttons (back, next, skip, done). You provide also a specific button style (backStyle, nextStyle, skipStyle, doneStyle). If you set a baseBtnStyle and a specific button style, the baseBtnStyle will be merge with specific style.

By default buttons has a style applied:

TextButton.styleFrom(
  shape: RoundedRectangleBorder(
    borderRadius: BorderRadius.circular(8.0),
  ),
)

You can override this using the baseBtnStyle or with specific button style. The exemple below will display :

• All buttons with 25px circular border
• Skip button with red color
• Done button with green color
• Next button with blue color

IntroductionScreen(
  pages: listPagesViewModel,
  showSkipButton: true,
  skip: const Text("Skip"),
  done: const Text("Done", style: TextStyle(fontWeight: FontWeight.w600)),
  onDone: () {
    // When done button is press
  },
  baseBtnStyle: TextButton.styleFrom(
    shape: RoundedRectangleBorder(
      borderRadius: BorderRadius.circular(25.0),
    ),
  ),  
  skipStyle: TextButton.styleFrom(primary: Colors.red),  
  doneColor: TextButton.styleFrom(primary: Colors.green),  
  nextColor: TextButton.styleFrom(primary: Colors.blue),
); 

Parameters of IntroductionScreen widget

Many parameters can be used to customized Intro like you want ! This is all parameters you can add :

Pages

• Page that will be display (PageViewModel), by adding pages: [..] parameter.
• Use your own pages (Widget) without using those predefined, by adding rawPages: [..] parameter.
  • If you provide both rawPages and pages parameter, pages will be used.

Callbacks

• Set a custom callback when done button is pressed, by adding onDone: () {} parameter.
  • This param is required if you define done param, EXCEPT if you set showDoneButton: false
  • If you set overrideDone param, it will be ignored.
• Set a custom callback when skip button is pressed, by adding onSkip: () {} parameter.
  • By default, it will go to the last page
  • If you set overrideSkip param, it will be ignored.
• Add callback to listen page changes, by adding onChange: (page) {} parameter.

Use pre-made buttons

• Define pre-made Done button child (Widget), by adding done: Text('Done')
  • This param or overrideDone are required, EXCEPT if you set showDoneButton: false
  • By providing done, the parameter onDone is also required.
• Define pre-made Next button child (Widget), by adding next: Text('Next')
  • This param is required, EXCEPT if you set showNextButton: false
• Define pre-made Skip button child (Widget), by adding skip: Text('Skip')
  • This param is required if you set showSkipButton: true Define pre-made Back button child (Widget), by adding back: Text('Back')
  • This param is required if you set showBackButton: true

Use custom buttons

If you want to control pages, you can use key param. Search in issues of this repo to have more detailed informations.

• Define your custom Done button (Widget), by using overrideDone
  • This param or done are required, EXCEPT if you set showDoneButton: false
  • This parameter has priority over the done parameter.
• Define your custom Next button (Widget), by using overrideNext
  • This param or next are required, EXCEPT if you set showNextButton: false
  • This parameter has priority over the next parameter.
• Define your custom Skip button (Widget), by using overrideSkip
  • This param or skip are required if you set showSkipButton: true
  • This parameter has priority over the skip parameter.
• Define your custom Back button (Widget), by using overrideBack
  • This param or back are required if you set showBackButton: true
  • This parameter has priority over the skip parameter.

Manage display of pre-made or custom buttons

• Hide/show Skip button, by adding showSkipButton: false parameter.
  • Default false
• Hide/show Next button, by adding showNextButton: false parameter.
  • Default true
• Hide/show Done button, by adding showDoneButton: false parameter.
  • Default true
• Hide/show Back button, by adding showBackButton: false parameter.
  • Default false

Controls

• Display or not the progress dots, by adding isProgress: false parameter.
  • Default true
• Enable or disable dots progress tap, by adding isProgressTap: false parameter.
  • Default true

Page

• Freeze the scroll, by adding freeze: true parameter.
  • Default false
• Duration of scrolling animation, by adding animationDuration: 400 parameter.
  • Default 350
• Initial page, by adding initialPage: 2 parameter.
  • Default 0
• You can provide a ScrollController for each page by adding scrollControllers: [..] parameter.
  • If you have 5 pages, you can provide 5 differents ScrollController.
  • If you want to have only one ScrollController for page 1, you can provide: scrollControllers: [controller1]
  • If you want to have only one ScrollController for page 3, you can provide: scrollControllers: [null, null, controller1]
  • Will be ignored for page(s) if useScrollView is set to false in PageViewModel(s)

Pages style

• Global background color, by adding globalBackgroundColor: Colors.blue parameter.
  • Tips: use Colors.transparent to display an image as background (using Stack with IntroductionScreen inside for example)
• Customize dots (progression) by adding dotsDecorator: DotsDecorator(...)
  • You can customize dots size, shape, colors, spacing.
• Customize dots container by adding dotsContainerDecorator: BoxDecorator(...)
  • You can customize container that contain controls.
• Skip/Back button flex, by adding skipOrBackFlex: 1 parameter.
  • Set 0 to disable Expanded behaviour, default 1
• Dots indicator flex, by adding dotsFlex: 1 parameter.
  • Set 0 to disable Expanded behaviour, default 1
• Next/Done button flex, by adding nextFlex: 1 parameter.
  • Set 0 to disable Expanded behaviour, default 1
• Animation curve between pages, by adding curve: Curves.elasticIn parameter.
  • Default Curves.easeIn

Buttons styles

• Change global style of buttons (for skip, next, done, back), by adding baseBtnStyle parameter.
• Change skip button style, by adding skipStyle: TextButton.styleFrom(alignment: Alignment.centerLeft) parameter.
• Change next button style, by adding nextStyle: TextButton.styleFrom(alignment: Alignment.centerRight) parameter.
• Change done button style, by adding doneStyle: TextButton.styleFrom(splashFactory: NoSplash.splashFactory) parameter.
• Change back button style, by adding backStyle: TextButton.styleFrom(primary: Colors.red) parameter.

Semantic

• Change skip button semantic label, by adding skipSemantic: 'Skip introduction' parameter.
• Change next button semantic label, by adding nextSemantic: 'Go to next page' parameter.
• Change done button semantic label, by adding doneSemantic: 'Exit introduction' parameter.
• Change back button semantic label, by adding backSemantic: 'Go to previous page' parameter.

Layout

• Enable or disable SafeArea on top, by adding isTopSafeArea: true parameter
  • Default false
• Enable or disable SafeArea on bottom, by adding isBottomSafeArea: true parameter.
  • Default false
• Customize controls position on screen, by adding controlsPosition: const Position(left: 0, right: 0, bottom: 100) parameter.
  • Default const Position(left: 0, right: 0, bottom: 0)
• Customize margin of controls's container, by adding controlsMargin: EdgeInsets.all(16.0) parameter.
  • Default EdgeInsets.zero
• Customize padding of controls's container, by adding controlsPadding: EdgeInsets.all(8.0) parameter.
  • Default EdgeInsets.all(16.0)
• Add global header (top), static and displayed above pages, by adding globalHeader: Image.asset(...) parameter.
• Add global footer below controls/dots, by adding globalFooter: ElevatedButton(...) parameter.
• Change axis of scroll by adding pagesAxis: Axis.vertical.
  • Default Axis.horizontal
• Change default scroll physics of PageView by adding scrollPhysics: ClampingScrollPhysics().
  • Default BouncingScrollPhysics()
• You can also enable right-to-left behavious by adding rtl: true.
  • Default false

Parameters of PageViewModel (each pages)

You can also provide many parameter to customize each pages :

• title: "Title of the page" or titleWidget: Text("Custom widget for title")
• body: "Body of the page" or bodyWidget: Text("Custom widget for body")
• image: Image.asset(...) image of the page.
  • It's expecting a Widget, so if you want to pass a Video, Text, or anything else, you can.
• footer: ElevatedButton(...), display a widget below body
  • Like image param, it's expecting a Widget, you can pass what you want.
• decoration: PageDecoration(...), page decoration to customize page
  • See next section for all parameters you can pass
• reverse: true, reverse order of image and content (title/body). (Default: false)
• useScrollView: false, by default pages use a Scrollview to handle small screen or long body text. You can remove ScrollView by setting to false.

Parameters of PageDecoration (decoration of a page)

• pageColor: Colors.white, background color of the page
  • You cannot use both pageColor and boxDecoration params
• titleTextStyle: TextStyle(...), TextStyle of the title
• bodyTextStyle: TextStyle(...), TextStyle of the body
• boxDecoration: BoxDecoration(...), BoxDecoration of page container
  • You cannot use both pageColor and boxDecoration params
• imageFlex: 2, flex ratio of the image
• bodyFlex: 3, flex ratio of the content (title/body)
• imagePadding: EdgeInsets.only(bottom: 12.0), padding of the image Widget. (Default EdgeInsets.only(bottom: 24.0))
• contentPadding: EdgeInsets.only(all: 24.0), padding of the content (title/body/footer) Widget. (Default EdgeInsets.all(16))
• titlePadding: EdgeInsets.only(bottom: 24.0), padding of the title text/Widget. (Default EdgeInsets.only(top: 16.0, bottom: 24.0))
• descriptionPadding: EdgeInsets.only(bottom: 24.0), padding of the body text/Widget. (Default EdgeInsets.zero)
• footerPadding: EdgeInsets.only(top: 24.0), padding of the footer text/Widget. (Default EdgeInsets.symmetric(vertical: 24.0))
• bodyAlignment: Align.center, content (title, body, footer) alignment. (Default Align.topCenter)
• imageAlignment: Align.center, image alignment. (Default Align.bottomCenter)
• fullScreen: true, Set image as fullscreen (background). (Default false)