Abstract base class for managing multi-level tree objects stored in JSON format. More...

#include <MultiLevelJsonBase.hpp>

Public Member Functions
	MultiLevelJsonBase (MultiLevelJsonBase *parent=Q_NULLPTR)
	Default constructor.

void	initFromUrl (const QString &url)
	Init the element from a URL. More...

void	initFromQVariantMap (const QVariantMap &map)
	Init the element from a QVariantMap. More...

	~MultiLevelJsonBase ()
	Destructor.

QString	getShortName () const
	Return the short name for this image to be used in the loading bar.

bool	hasErrorOccured () const
	Return true if an error occured while loading the data.

int	getLevel () const
	Get the depth level in the tree.

QVariantMap	toQVariantMap () const
	Convert the image informations to a map following the JSON structure. More...

void	scheduleChildsDeletion ()
	Schedule a deletion for all the childs. More...

Public Member Functions inherited from StelSkyLayer
	StelSkyLayer (QObject *parent=Q_NULLPTR)

virtual void	draw (StelCore *core, StelPainter &sPainter, float opacity=1.)=0
	Draws the content of the layer.

virtual QString	getShortServerCredits () const
	Return the short server name to display in the loading bar.

virtual QString	getKeyHint () const
	Return a hint on which key to use for referencing this layer. More...

virtual QString	getLayerDescriptionHtml () const
	Return a human readable description of the layer with e.g. More...

void	setFrameType (StelCore::FrameType ft)
	Set the reference frame type.

StelCore::FrameType	getFrameType ()
	Get the reference frame type.

Protected Member Functions
virtual void	loadFromQVariantMap (const QVariantMap &map)=0
	Load the element from a valid QVariantMap. More...

bool	isDeletionScheduled () const
	Return true if a deletion is currently scheduled.

void	updatePercent (int tot, int numToBeLoaded)

void	deleteUnusedSubTiles ()
	Delete all the subtiles which were not displayed since more than lastDrawTrigger seconds.

void	cancelDeletion ()
	If a deletion was scheduled, cancel it.

Static Protected Member Functions
static QVariantMap	loadFromJSON (QIODevice &input, bool qZcompressed=false, bool gzCompressed=false)
	Load the element information from a JSON file.

Protected Attributes
QString	shortName
	The very short name for this image set to be used in loading bar.

QString	baseUrl
	Base URL to prefix to relative URL.

QString	contructorUrl
	The relative URL passed to the constructor.

QList< MultiLevelJsonBase * >	subTiles
	The list of all the created subtiles for this tile.

bool	errorOccured
	Set to true if an error occured with this tile and it should not be displayed.

bool	downloading
	true if the JSON descriptor file is currently downloading

Additional Inherited Members
Signals inherited from StelSkyLayer
void	loadingStateChanged (bool b)
	Emitted when loading of data started or stopped. More...

void	percentLoadedChanged (int percentage)
	Emitted when the percentage of loading tiles/tiles to be displayed changed. More...

Detailed Description

The JSON files can be stored on disk or remotely and are loaded into threads.

Member Function Documentation

void MultiLevelJsonBase::initFromQVariantMap ( const QVariantMap & map )

This method should be called by the constructors of the subclass.

void MultiLevelJsonBase::initFromUrl ( const QString & url )

This method should be called by the constructors of the subclass.

virtual void MultiLevelJsonBase::loadFromQVariantMap ( const QVariantMap & map )

protectedpure virtual

This method is called after the JSON files are downloaded and parsed into a QVariantMap.

void MultiLevelJsonBase::scheduleChildsDeletion ( )

It will practically occur after the delay passed as argument to deleteUnusedTiles() has expired.

QVariantMap MultiLevelJsonBase::toQVariantMap ( ) const

It can be saved as JSON using the StelJsonParser methods.