PageController class Null safety

A controller for PageView.

A page controller lets you manipulate which page is visible in a PageView. In addition to being able to control the pixel offset of the content inside the PageView, a PageController also lets you control the offset in terms of pages, which are increments of the viewport size.

See also:

  • PageView, which is the widget this object controls.

link
This widget introduces a MaterialApp, Scaffold and PageView with two pages using the default constructor. Both pages contain an ElevatedButton allowing you to animate the PageView using a PageController. 
class MyPageView extends StatefulWidget {
  const MyPageView({super.key});

  @override
  State<MyPageView> createState() => _MyPageViewState();
}

class _MyPageViewState extends State<MyPageView> {
  final PageController _pageController = PageController();

  @override
  void dispose() {
    _pageController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: PageView(
          controller: _pageController,
          children: <Widget>[
            Container(
              color: Colors.red,
              child: Center(
                child: ElevatedButton(
                  onPressed: () {
                    if (_pageController.hasClients) {
                      _pageController.animateToPage(
                        1,
                        duration: const Duration(milliseconds: 400),
                        curve: Curves.easeInOut,
                      );
                    }
                  },
                  child: const Text('Next'),
                ),
              ),
            ),
            Container(
              color: Colors.blue,
              child: Center(
                child: ElevatedButton(
                  onPressed: () {
                    if (_pageController.hasClients) {
                      _pageController.animateToPage(
                        0,
                        duration: const Duration(milliseconds: 400),
                        curve: Curves.easeInOut,
                      );
                    }
                  },
                  child: const Text('Previous'),
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }
}

Inheritance

Constructors

PageController({int initialPage = 0, bool keepPage = true, double viewportFraction = 1.0})
Creates a page controller.

Properties

debugLabel → String?
A label that is used in the toString output. Intended to aid with identifying scroll controller instances in debug output.
finalinherited
hasClients → bool
Whether any ScrollPosition objects have attached themselves to the ScrollController using the attach method.
read-onlyinherited
hashCode → int
The hash code for this object.
read-onlyinherited
hasListeners → bool
Whether any listeners are currently registered.
protected">@protectedread-onlyinherited
initialPage → int
The page to show when first creating the PageView.
final
initialScrollOffset → double
The initial value to use for offset.
read-onlyinherited
keepPage → bool
Save the current page with PageStorage and restore it if this controller's scrollable is recreated.
final
keepScrollOffset → bool
Each time a scroll completes, save the current scroll offset with PageStorage and restore it if this controller's scrollable is recreated.
finalinherited
offset → double
The current scroll offset of the scrollable widget.
read-onlyinherited
page → double?
The current page displayed in the controlled PageView.
read-only
position → ScrollPosition
Returns the attached ScrollPosition, from which the actual scroll offset of the ScrollView can be obtained.
read-onlyinherited
positions → Iterable<ScrollPosition>
The currently attached positions.
read-onlyinherited
runtimeType → Type
A representation of the runtime type of the object.
read-onlyinherited
viewportFraction → double
The fraction of the viewport that each page should occupy.
final

Methods

addListener(VoidCallback listener) → void
Register a closure to be called when the object changes.
inherited
animateTo(double offset, {required Duration duration, required Curve curve}) → Future<void>
Animates the position from its current value to the given value.
inherited
animateToPage(int page, {required Duration duration, required Curve curve}) → Future<void>
Animates the controlled PageView from the current page to the given page.
attach(ScrollPosition position) → void
Register the given position with this controller.
override
createScrollPosition(ScrollPhysics physics, ScrollContext context, ScrollPosition? oldPosition) → ScrollPosition
Creates a ScrollPosition for use by a Scrollable widget.
override
debugFillDescription(List<String> description) → void
Add additional information to the given description for use by toString.
mustCallSuper">@mustCallSuperinherited
detach(ScrollPosition position) → void
Unregister the given position with this controller.
inherited
dispose() → void
Discards any resources used by the object. After this is called, the object is not in a usable state and should be discarded (calls to addListener will throw after the object is disposed).
inherited
jumpTo(double value) → void
Jumps the scroll position from its current value to the given value, without animation, and without checking if the new value is in range.
inherited
jumpToPage(int page) → void
Changes which page is displayed in the controlled PageView.
nextPage({required Duration duration, required Curve curve}) → Future<void>
Animates the controlled PageView to the next page.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed.
inherited
notifyListeners() → void
Call all the registered listeners.
protected">@protectedvisibleForTesting">@visibleForTestinginherited
previousPage({required Duration duration, required Curve curve}) → Future<void>
Animates the controlled PageView to the previous page.
removeListener(VoidCallback listener) → void
Remove a previously registered closure from the list of closures that are notified when the object changes.
inherited
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited