Package com.luciad.view.lightspeed.label.location

Class ALspLabelLocations

java.lang.Object

com.luciad.view.lightspeed.label.location.ALspLabelLocations

Direct Known Subclasses:

TLspLabelLocations

public abstract class ALspLabelLocations
extends Object

ALspLabelLocations is the central place where information is kept about the position of labels and whether or not they are visible. It can store locations and their visibility for multiple layers.

For a label, this information is updated using

• setLabelLocations: updates the locations and resets all visibilities
• updateLabelLocations: updates the locations and visibilities of the given labels only

To retrieve information, use:

• getLabelLocation to get information for one label
• getLabelLocations to get information for a set of labels

It is up to the implementation of this class how this information is stored. One implementation may store the information inside the domain objects, while another implementation may store this information external to the domain object in some sort of map.

Since:

2012.0

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	ALspLabelLocations.LocationInfo	Encapsulates a label and its location and visibility.

Constructor Summary

Constructors

Constructor	Description
ALspLabelLocations()

Method Summary

Modifier and Type	Method	Description
abstract void	addLabelLocationListener(ILspLabelLocationChangeListener aListener)	Adds the specified listener to this information store.
abstract ALspLabelLocations.LocationInfo	getLabelLocation(ILspView aView, TLspLabelID aLabel)	Returns the location and visibility for the requested label.
abstract Iterable<ALspLabelLocations.LocationInfo>	getLabelLocations(ILspView aView, ILspLayer aLayer, TLspPaintRepresentation aPaintRepresentation, boolean aVisibleOnly)	Retrieves the current set of label locations and visibilities.
abstract void	removeLabelLocationListener(ILspLabelLocationChangeListener aListener)	Removes the specified listener.
abstract void	setLabelLocations(List<TLspLabelID> aLabels, List<ALspLabelLocation> aLocations, List<Boolean> aVisibilities, ILspView aView)	Stores the given location information so it can be retrieved later on.
abstract void	updateLabelLocations(List<TLspLabelID> aLabels, List<ALspLabelLocation> aLocations, List<Boolean> aVisibilities, ILspView aView)	Stores the given location information so it can be retrieved later on.

Methods inherited from class java.lang.Object

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

Constructor Details

ALspLabelLocations

public ALspLabelLocations()

Method Details

addLabelLocationListener

public abstract void addLabelLocationListener(ILspLabelLocationChangeListener aListener)

Adds the specified listener to this information store. This listener will be notified of changes in the label information.

Parameters:

aListener - The listener that should be informed when there are changes in the label information.

See Also:

• updateLabelLocations(java.util.List<com.luciad.view.lightspeed.painter.label.TLspLabelID>, java.util.List<com.luciad.view.lightspeed.label.location.ALspLabelLocation>, java.util.List<java.lang.Boolean>, com.luciad.view.lightspeed.ILspView)

removeLabelLocationListener

public abstract void removeLabelLocationListener(ILspLabelLocationChangeListener aListener)

Removes the specified listener. This listener will no longer be notified of changes in the label information.

Parameters:

aListener - The listener to remove.

setLabelLocations

public abstract void setLabelLocations(List<TLspLabelID> aLabels,
 List<ALspLabelLocation> aLocations,
 List<Boolean> aVisibilities,
 ILspView aView)

Stores the given location information so it can be retrieved later on.

Note that this call sets all labels that are not explicitly specified to invisible.

This method also allows to remove the information: just let the ALspLabelLocation be null.

Parameters:

aLabels - An array of objects identifying a label to which this information applies.

aLocations - An array of locations. No references to the locations are kept within the implementations of this class. This allows the client of this class to reuse the same locations. If this location is null, any label information already present in this instance about the given representation is removed from this class.

aVisibilities - An array of booleans indicating visibility of the labels.

aView - The view for which the location applies.

See Also:

• updateLabelLocations(java.util.List<com.luciad.view.lightspeed.painter.label.TLspLabelID>, java.util.List<com.luciad.view.lightspeed.label.location.ALspLabelLocation>, java.util.List<java.lang.Boolean>, com.luciad.view.lightspeed.ILspView)

updateLabelLocations

public abstract void updateLabelLocations(List<TLspLabelID> aLabels,
 List<ALspLabelLocation> aLocations,
 List<Boolean> aVisibilities,
 ILspView aView)

Stores the given location information so it can be retrieved later on.

This call only changes the location and visibility of the specified labels, and leaves the other labels untouched.

This method also allows to remove the information: just let the ALspLabelLocation be null.

Parameters:

aLabels - An array of objects identifying a label to which this information applies.

aLocations - An array of locations. No references to the locations are kept within the implementations of this class. This allows the client of this class to reuse the same locations. If this location is null, any label information already present in this instance about the given representation is removed from this class.

aVisibilities - The identifiers for the labels that should be visible.

aView - The view for which the location applies.

See Also:

• setLabelLocations(java.util.List<com.luciad.view.lightspeed.painter.label.TLspLabelID>, java.util.List<com.luciad.view.lightspeed.label.location.ALspLabelLocation>, java.util.List<java.lang.Boolean>, com.luciad.view.lightspeed.ILspView)

getLabelLocation

public abstract ALspLabelLocations.LocationInfo getLabelLocation(ILspView aView,
 TLspLabelID aLabel)

Returns the location and visibility for the requested label.

This method never return null, but the location inside can be null.

Parameters:

aView - The view

aLabel - The label

Returns:

The location info, never null

getLabelLocations

public abstract Iterable<ALspLabelLocations.LocationInfo> getLabelLocations(ILspView aView,
 ILspLayer aLayer,
 TLspPaintRepresentation aPaintRepresentation,
 boolean aVisibleOnly)

Retrieves the current set of label locations and visibilities.

Parameters:

aView - The view to retrieve the information for, never null

aLayer - The layer to retrieve the information for, can be null if all layers relevant

aPaintRepresentation - The paint representation to retrieve the information, can be null if the layer is also null

aVisibleOnly - Indicates whether all information is necessary, or only that of visible labels

Returns:

A set of labels with their location and visibility.