Package org.fxmisc.flowless

Class SizeTracker

java.lang.Object

org.fxmisc.flowless.SizeTracker

final class SizeTracker
extends java.lang.Object

Estimates the size of the entire viewport (if it was actually completely rendered) based on the known sizes of the Cells whose nodes are currently displayed in the viewport and an estimated average of Cells whose nodes are not displayed in the viewport. The meaning of breadthForCells and totalLengthEstimate are dependent upon which implementation of OrientationHelper is used.

Field Summary

Fields

Modifier and Type	Field	Description
private org.reactfx.value.Val<java.lang.Double>	averageLengthEstimate	Stores either null or the average length of the cells' nodes currently displayed in the viewport
private org.reactfx.value.Val<java.lang.Double>	breadthForCells	Stores either the greatest minimum cell's node's breadth or the viewport's breadth
private org.reactfx.collection.MemoizationList<java.lang.Double>	breadths
private org.reactfx.collection.MemoizationList<? extends Cell<?,?>>	cells
private org.reactfx.value.Val<java.lang.Double>	lengthOffsetEstimate
private org.reactfx.collection.MemoizationList<java.lang.Double>	lengths
private org.reactfx.value.Val<java.lang.Double>	maxKnownMinBreadth
private OrientationHelper	orientation
private org.reactfx.Subscription	subscription
private org.reactfx.value.Val<java.lang.Double>	totalLengthEstimate
private javafx.beans.value.ObservableObjectValue<javafx.geometry.Bounds>	viewportBounds

Constructor Summary

Constructors

Constructor	Description
SizeTracker(OrientationHelper orientation, javafx.beans.value.ObservableObjectValue<javafx.geometry.Bounds> viewportBounds, org.reactfx.collection.MemoizationList<? extends Cell<?,?>> lazyCells)	Constructs a SizeTracker

Method Summary

Modifier and Type	Method	Description
org.reactfx.value.Val<java.lang.Double>	averageLengthEstimateProperty()
private static <T> org.reactfx.value.Val<T>	avoidFalseInvalidations(org.reactfx.value.Val<T> src)
double	breadthFor(int itemIndex)
void	dispose()
void	forgetSizeOf(int itemIndex)
java.util.Optional<java.lang.Double>	getAverageLengthEstimate()
double	getCellLayoutBreadth()
double	getViewportBreadth()
double	getViewportLength()
double	lengthFor(int itemIndex)
org.reactfx.value.Val<java.lang.Double>	lengthOffsetEstimateProperty()
org.reactfx.value.Val<java.lang.Double>	maxCellBreadthProperty()
org.reactfx.value.Val<java.lang.Double>	totalLengthEstimateProperty()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

orientation

private final OrientationHelper orientation

viewportBounds

private final javafx.beans.value.ObservableObjectValue<javafx.geometry.Bounds> viewportBounds

cells

private final org.reactfx.collection.MemoizationList<? extends Cell<?,?>> cells

breadths

private final org.reactfx.collection.MemoizationList<java.lang.Double> breadths

maxKnownMinBreadth

private final org.reactfx.value.Val<java.lang.Double> maxKnownMinBreadth

breadthForCells

private final org.reactfx.value.Val<java.lang.Double> breadthForCells

Stores either the greatest minimum cell's node's breadth or the viewport's breadth

lengths

private final org.reactfx.collection.MemoizationList<java.lang.Double> lengths

averageLengthEstimate

private final org.reactfx.value.Val<java.lang.Double> averageLengthEstimate

Stores either null or the average length of the cells' nodes currently displayed in the viewport

totalLengthEstimate

private final org.reactfx.value.Val<java.lang.Double> totalLengthEstimate

lengthOffsetEstimate

private final org.reactfx.value.Val<java.lang.Double> lengthOffsetEstimate

subscription

private final org.reactfx.Subscription subscription

Constructor Detail

SizeTracker

public SizeTracker(OrientationHelper orientation,
                   javafx.beans.value.ObservableObjectValue<javafx.geometry.Bounds> viewportBounds,
                   org.reactfx.collection.MemoizationList<? extends Cell<?,?>> lazyCells)

Constructs a SizeTracker

Parameters:

orientation - if vertical, breadth = width and length = height; if horizontal, breadth = height and length = width

Method Detail

avoidFalseInvalidations

private static <T> org.reactfx.value.Val<T> avoidFalseInvalidations(org.reactfx.value.Val<T> src)

dispose

public void dispose()

maxCellBreadthProperty

public org.reactfx.value.Val<java.lang.Double> maxCellBreadthProperty()

getViewportBreadth

public double getViewportBreadth()

getViewportLength

public double getViewportLength()

averageLengthEstimateProperty

public org.reactfx.value.Val<java.lang.Double> averageLengthEstimateProperty()

getAverageLengthEstimate

public java.util.Optional<java.lang.Double> getAverageLengthEstimate()

totalLengthEstimateProperty

public org.reactfx.value.Val<java.lang.Double> totalLengthEstimateProperty()

lengthOffsetEstimateProperty

public org.reactfx.value.Val<java.lang.Double> lengthOffsetEstimateProperty()

breadthFor

public double breadthFor(int itemIndex)

forgetSizeOf

public void forgetSizeOf(int itemIndex)

lengthFor

public double lengthFor(int itemIndex)

getCellLayoutBreadth

public double getCellLayoutBreadth()