PageMetrics class Null safety

Metrics for a PreloadPageView.

The metrics are available on ScrollNotifications generated from PreloadPageViews.

Inheritance

Constructors

PageMetrics({required double? minScrollExtent, required double? maxScrollExtent, required double? pixels, required double? viewportDimension, required AxisDirection axisDirection, required double viewportFraction})
Creates an immutable snapshot of values associated with a PreloadPageView.

Properties

atEdge bool
Whether the pixels value is exactly at the minScrollExtent or the maxScrollExtent.
read-onlyinherited
axis Axis
The axis in which the scroll view scrolls.
read-onlyinherited
axisDirection AxisDirection
The direction in which the scroll view scrolls.
finalinherited
extentAfter double
The quantity of content conceptually "below" the viewport in the scrollable. This is the content below the content described by extentInside.
read-onlyinherited
extentBefore double
The quantity of content conceptually "above" the viewport in the scrollable. This is the content above the content described by extentInside.
read-onlyinherited
extentInside double
The quantity of content conceptually "inside" the viewport in the scrollable.
read-onlyinherited
hasContentDimensions bool
Whether the minScrollExtent and the maxScrollExtent properties are available.
read-onlyinherited
hashCode int
The hash code for this object.
read-onlyinherited
hasPixels bool
Whether the pixels property is available.
read-onlyinherited
hasViewportDimension bool
Whether the viewportDimension property is available.
read-onlyinherited
maxScrollExtent double
The maximum in-range value for pixels.
read-onlyinherited
minScrollExtent double
The minimum in-range value for pixels.
read-onlyinherited
outOfRange bool
Whether the pixels value is outside the minScrollExtent and maxScrollExtent.
read-onlyinherited
page double?
The current page displayed in the PreloadPageView.
read-only
pixels double
The current scroll position, in logical pixels along the axisDirection.
read-onlyinherited
runtimeType Type
A representation of the runtime type of the object.
read-onlyinherited
viewportDimension double
The extent of the viewport along the axisDirection.
read-onlyinherited
viewportFraction double
The fraction of the viewport that each page occupies.
final

Methods

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

Operators

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