FixedExtentScrollController class

A controller for scroll views whose items have the same size.

Similar to a standard ScrollController but with the added convenience mechanisms to read and go to item indices rather than a raw pixel scroll offset.

See also:

Inheritance

Constructors

FixedExtentScrollController({int initialItem: 0 })
Creates a scroll controller for scrollables whose items have the same size. [...]

Properties

initialItem int
The page to show when first creating the scroll view. [...]
final
selectedItem int
The currently selected item index that's closest to the center of the viewport. [...]
read-only
debugLabel String
A label that is used in the toString output. Intended to aid with identifying scroll controller instances in debug output.
final, inherited
hasClients bool
Whether any ScrollPosition objects have attached themselves to the ScrollController using the attach method. [...]
read-only, inherited
hashCode int
The hash code for this object. [...]
read-only, inherited
hasListeners bool
Whether any listeners are currently registered. [...]
@protected, read-only, inherited
initialScrollOffset double
The initial value to use for offset. [...]
read-only, inherited
keepScrollOffset bool
Each time a scroll completes, save the current scroll offset with PageStorage and restore it if this controller's scrollable is recreated. [...]
final, inherited
offset double
The current scroll offset of the scrollable widget. [...]
read-only, inherited
position ScrollPosition
Returns the attached ScrollPosition, from which the actual scroll offset of the ScrollView can be obtained. [...]
read-only, inherited
positions Iterable<ScrollPosition>
The currently attached positions. [...]
@protected, read-only, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited

Methods

animateToItem(int itemIndex, { Duration duration, Curve curve }) Future<Null>
Animates the controlled scroll view to the given item index. [...]
createScrollPosition(ScrollPhysics physics, ScrollContext context, ScrollPosition oldPosition) ScrollPosition
Creates a ScrollPosition for use by a Scrollable widget. [...]
jumpToItem(int itemIndex) → void
Changes which item index is centered in the controlled scroll view. [...]
addListener(VoidCallback listener) → void
Register a closure to be called when the object changes. [...]
inherited
animateTo(double offset, { Duration duration, Curve curve }) Future<Null>
Animates the position from its current value to the given value. [...]
inherited
attach(ScrollPosition position) → void
Register the given position with this controller. [...]
inherited
debugFillDescription(List<String> description) → void
Add additional information to the given description for use by toString. [...]
@mustCallSuper, inherited
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 and removeListener 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
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
inherited
notifyListeners() → void
Call all the registered listeners. [...]
@protected, inherited
removeListener(VoidCallback listener) → void
Remove a previously registered closure from the list of closures that are notified when the object changes. [...]
inherited
toString() String
Returns a string representation of this object.
inherited

Operators

operator ==(dynamic other) bool
The equality operator. [...]
inherited