FixedScrollMetrics class

An immutable snapshot of values associated with a Scrollable viewport.

For details, see ScrollMetrics, which defines this object's interfaces.

This sample shows how a ScrollMetricsNotification is dispatched when the ScrollMetrics changed as a result of resizing the Viewport. Press the floating action button to increase the scrollable window's size.
link

To create a local project with this code sample, run:
flutter create --sample=widgets.FixedScrollMetrics.1 mysample

Mixed in types
Implementers

Constructors

FixedScrollMetrics({required double? minScrollExtent, required double? maxScrollExtent, required double? pixels, required double? viewportDimension, required AxisDirection axisDirection, required double devicePixelRatio})
Creates an immutable snapshot of values associated with a Scrollable viewport.

Properties

atEdge bool
Whether the pixels value is exactly at the minScrollExtent or the maxScrollExtent.
no setterinherited
axis Axis
The axis in which the scroll view scrolls.
no setterinherited
axisDirection AxisDirection
The direction in which the scroll view scrolls.
final
devicePixelRatio double
The FlutterView.devicePixelRatio of the view that the Scrollable associated with this metrics object is drawn into.
final
extentAfter double
The quantity of content conceptually "below" the viewport in the scrollable. This is the content below the content described by extentInside.
no setterinherited
extentBefore double
The quantity of content conceptually "above" the viewport in the scrollable. This is the content above the content described by extentInside.
no setterinherited
extentInside double
The quantity of content conceptually "inside" the viewport in the scrollable (including empty space if the total amount of content is less than the viewportDimension).
no setterinherited
extentTotal double
The total quantity of content available.
no setterinherited
hasContentDimensions bool
Whether the minScrollExtent and the maxScrollExtent properties are available.
no setteroverride
hashCode int
The hash code for this object.
no setterinherited
hasPixels bool
Whether the pixels property is available.
no setteroverride
hasViewportDimension bool
Whether the viewportDimension property is available.
no setteroverride
maxScrollExtent double
The maximum in-range value for pixels.
no setteroverride
minScrollExtent double
The minimum in-range value for pixels.
no setteroverride
outOfRange bool
Whether the pixels value is outside the minScrollExtent and maxScrollExtent.
no setterinherited
pixels double
The current scroll position, in logical pixels along the axisDirection.
no setteroverride
runtimeType Type
A representation of the runtime type of the object.
no setterinherited
viewportDimension double
The extent of the viewport along the axisDirection.
no setteroverride

Methods

copyWith({double? minScrollExtent, double? maxScrollExtent, double? pixels, double? viewportDimension, AxisDirection? axisDirection, double? devicePixelRatio}) ScrollMetrics
Creates a ScrollMetrics that has the same properties as this object.
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
toString() String
A string representation of this object.
override

Operators

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