QgsVectorLayerTemporalProperties Class Reference

Implementation of map layer temporal properties for vector layers. More...

#include <qgsvectorlayertemporalproperties.h>

Inheritance diagram for QgsVectorLayerTemporalProperties:

Public Member Functions
	QgsVectorLayerTemporalProperties (QObject *parent=nullptr, bool enabled=false)
	Constructor for QgsVectorLayerTemporalProperties, with the specified parent object. More...
bool	accumulateFeatures () const
	Returns true if features will be accumulated over time (i.e. More...
QgsDateTimeRange	calculateTemporalExtent (QgsMapLayer *layer) const override
	Attempts to calculate the overall temporal extent for the specified layer, using the settings defined by the temporal properties object. More...
QString	createFilterString (const QgsVectorLayerTemporalContext &context, const QgsDateTimeRange &range) const
	Creates a QGIS expression filter string for filtering features within the specified context to those within the specified time range. More...
QString	durationField () const
	Returns the name of the duration field, which contains the duration of the event. More...
QgsUnitTypes::TemporalUnit	durationUnits () const
	Returns the units of the event's duration. More...
QString	endExpression () const
	Returns the expression for the end time for the feature's time spans. More...
QString	endField () const
	Returns the name of the end datetime field, which contains the end time for the feature's time spans. More...
double	fixedDuration () const
	Returns the fixed duration length, which contains the duration of the event. More...
const QgsDateTimeRange &	fixedTemporalRange () const
	Returns the fixed temporal range for the layer. More...
QgsTemporalProperty::Flags	flags () const override
	Returns flags associated to the temporal property. More...
void	guessDefaultsFromFields (const QgsFields &fields)
	Attempts to setup the temporal properties by scanning a set of fields and looking for standard naming conventions (e.g. More...
bool	isVisibleInTemporalRange (const QgsDateTimeRange &range) const override
	Returns true if the layer should be visible and rendered for the specified time range. More...
Qgis::VectorTemporalLimitMode	limitMode () const
	Returns the temporal limit mode (to include or exclude begin/end limits). More...
Qgis::VectorTemporalMode	mode () const
	Returns the temporal properties mode. More...
bool	readXml (const QDomElement &element, const QgsReadWriteContext &context) override
	Reads temporal properties from a DOM element previously written by writeXml(). More...
void	setAccumulateFeatures (bool accumulate)
	Sets whether features will be accumulated over time (i.e. More...
void	setDefaultsFromDataProviderTemporalCapabilities (const QgsDataProviderTemporalCapabilities *capabilities) override
	Sets the layers temporal settings to appropriate defaults based on a provider's temporal capabilities. More...
void	setDurationField (const QString &field)
	Sets the name of the duration field, which contains the duration of the event. More...
void	setDurationUnits (QgsUnitTypes::TemporalUnit units)
	Sets the units of the event's duration. More...
void	setEndExpression (const QString &endExpression)
	Sets the expression to use for the end time for the feature's time spans. More...
void	setEndField (const QString &field)
	Sets the name of the end datetime field, which contains the end time for the feature's time spans. More...
void	setFixedDuration (double duration)
	Sets the fixed event duration, which contains the duration of the event. More...
void	setFixedTemporalRange (const QgsDateTimeRange &range)
	Sets a temporal range to apply to the whole layer. More...
void	setLimitMode (Qgis::VectorTemporalLimitMode mode)
	Sets the temporal limit mode (to include or exclude begin/end limits). More...
void	setMode (Qgis::VectorTemporalMode mode)
	Sets the temporal properties mode. More...
void	setStartExpression (const QString &expression)
	Sets the expression to use for the start time for the feature's time spans. More...
void	setStartField (const QString &field)
	Sets the name of the start datetime field, which contains the start time for the feature's time spans. More...
QString	startExpression () const
	Returns the expression for the start time for the feature's time spans. More...
QString	startField () const
	Returns the name of the start datetime field, which contains the start time for the feature's time spans. More...
QDomElement	writeXml (QDomElement &element, QDomDocument &doc, const QgsReadWriteContext &context) override
	Writes the properties to a DOM element, to be used later with readXml(). More...
Public Member Functions inherited from QgsMapLayerTemporalProperties
	QgsMapLayerTemporalProperties (QObject *parent, bool enabled=false)
	Constructor for QgsMapLayerTemporalProperties, with the specified parent object. More...
virtual QList< QgsDateTimeRange >	allTemporalRanges (QgsMapLayer *layer) const
	Attempts to calculate the overall list of all temporal extents which are contained in the specified layer, using the settings defined by the temporal properties object. More...
virtual QgsDateTimeRange	calculateTemporalExtent (QgsMapLayer *layer) const
	Attempts to calculate the overall temporal extent for the specified layer, using the settings defined by the temporal properties object. More...
virtual bool	isVisibleInTemporalRange (const QgsDateTimeRange &range) const
	Returns true if the layer should be visible and rendered for the specified time range. More...
virtual bool	readXml (const QDomElement &element, const QgsReadWriteContext &context)=0
	Reads temporal properties from a DOM element previously written by writeXml(). More...
virtual void	setDefaultsFromDataProviderTemporalCapabilities (const QgsDataProviderTemporalCapabilities *capabilities)=0
	Sets the layers temporal settings to appropriate defaults based on a provider's temporal capabilities. More...
virtual QDomElement	writeXml (QDomElement &element, QDomDocument &doc, const QgsReadWriteContext &context)=0
	Writes the properties to a DOM element, to be used later with readXml(). More...
Public Member Functions inherited from QgsTemporalProperty
	QgsTemporalProperty (QObject *parent=nullptr, bool enabled=false)
	Constructor for QgsTemporalProperty, with the specified parent object. More...
virtual QgsTemporalProperty::Flags	flags () const
	Returns flags associated to the temporal property. More...
bool	isActive () const
	Returns true if the temporal property is active. More...
void	setIsActive (bool active)
	Sets whether the temporal property is active. More...

Additional Inherited Members
Public Types inherited from QgsTemporalProperty
enum	Flag { FlagDontInvalidateCachedRendersWhenRangeChanges = 1 }
	Flags attached to the temporal property. More...
Signals inherited from QgsTemporalProperty
void	changed ()
	Emitted when the temporal properties have changed. More...

Detailed Description

Implementation of map layer temporal properties for vector layers.

Since

QGIS 3.14

Definition at line 70 of file qgsvectorlayertemporalproperties.h.

Constructor & Destructor Documentation

QgsVectorLayerTemporalProperties()

QgsVectorLayerTemporalProperties::QgsVectorLayerTemporalProperties	(	QObject *	parent = nullptr,
		bool	enabled = false
	)

Constructor for QgsVectorLayerTemporalProperties, with the specified parent object.

The enabled argument specifies whether the temporal properties are initially enabled or not (see isActive()).

Definition at line 25 of file qgsvectorlayertemporalproperties.cpp.

Member Function Documentation

accumulateFeatures()

bool QgsVectorLayerTemporalProperties::accumulateFeatures

(

)

const

Returns true if features will be accumulated over time (i.e.

all features which occur before or within the map's temporal range should be rendered).

Warning

This setting is only effective when mode() is QgsVectorLayerTemporalProperties::ModeFeatureDateTimeInstantFromField

See also

setAccumulateFeatures()

Definition at line 375 of file qgsvectorlayertemporalproperties.cpp.

calculateTemporalExtent()

QgsDateTimeRange QgsVectorLayerTemporalProperties::calculateTemporalExtent ( QgsMapLayer *  layer ) const

overridevirtual

Attempts to calculate the overall temporal extent for the specified layer, using the settings defined by the temporal properties object.

May return an infinite range if the extent could not be calculated.

Note

Not available in Python bindings

Reimplemented from QgsMapLayerTemporalProperties.

Definition at line 50 of file qgsvectorlayertemporalproperties.cpp.

createFilterString()

QString QgsVectorLayerTemporalProperties::createFilterString	(	const QgsVectorLayerTemporalContext &	context,
		const QgsDateTimeRange &	range
	)		const

Creates a QGIS expression filter string for filtering features within the specified context to those within the specified time range.

The returned expression string considers the mode() and other related settings (such as startField()) when building the filter string.

Warning

Note that ModeFixedTemporalRange is intentional NOT handled by this method and if mode() is ModeFixedTemporalRange then an empty string will be returned. Use isVisibleInTemporalRange() when testing whether features from a layer set to the ModeFixedTemporalRange should ALL be filtered out.

Definition at line 445 of file qgsvectorlayertemporalproperties.cpp.

durationField()

QString QgsVectorLayerTemporalProperties::durationField

(

)

const

Returns the name of the duration field, which contains the duration of the event.

Units are specified by durationUnits()

Warning

This setting is only effective when mode() is QgsVectorLayerTemporalProperties::ModeFeatureDateTimeStartAndDurationFromFields

See also

setDurationField()

durationUnits()

Definition at line 415 of file qgsvectorlayertemporalproperties.cpp.

durationUnits()

QgsUnitTypes::TemporalUnit QgsVectorLayerTemporalProperties::durationUnits

(

)

const

Returns the units of the event's duration.

See also

setDurationUnits()

Definition at line 425 of file qgsvectorlayertemporalproperties.cpp.

endExpression()

QString QgsVectorLayerTemporalProperties::endExpression

(

)

const

Returns the expression for the end time for the feature's time spans.

Warning

This setting is only effective when mode() is QgsVectorLayerTemporalProperties::ModeFeatureDateTimeStartAndEndFromExpressions

See also

setEndExpression()

startExpression()

Definition at line 365 of file qgsvectorlayertemporalproperties.cpp.

endField()

QString QgsVectorLayerTemporalProperties::endField

(

)

const

Returns the name of the end datetime field, which contains the end time for the feature's time spans.

See also

setEndField()

startField()

Definition at line 405 of file qgsvectorlayertemporalproperties.cpp.

fixedDuration()

double QgsVectorLayerTemporalProperties::fixedDuration

(

)

const

Returns the fixed duration length, which contains the duration of the event.

Units are specified by durationUnits()

Warning

This setting is only effective when mode() is QgsVectorLayerTemporalProperties::ModeFeatureDateTimeInstantFromField

See also

setFixedDuration()

durationUnits()

Definition at line 385 of file qgsvectorlayertemporalproperties.cpp.

fixedTemporalRange()

const QgsDateTimeRange & QgsVectorLayerTemporalProperties::fixedTemporalRange

(

)

const

Returns the fixed temporal range for the layer.

Warning

To be used only when mode() is QgsVectorLayerTemporalProperties::ModeFixedTemporalRange

See also

setFixedTemporalRange()

Definition at line 254 of file qgsvectorlayertemporalproperties.cpp.

flags()

QgsTemporalProperty::Flags QgsVectorLayerTemporalProperties::flags ( ) const

overridevirtual

Returns flags associated to the temporal property.

Reimplemented from QgsTemporalProperty.

Definition at line 244 of file qgsvectorlayertemporalproperties.cpp.

guessDefaultsFromFields()

void QgsVectorLayerTemporalProperties::guessDefaultsFromFields

(

const QgsFields &

fields

)

Attempts to setup the temporal properties by scanning a set of fields and looking for standard naming conventions (e.g.

"begin_date").

Definition at line 609 of file qgsvectorlayertemporalproperties.cpp.

isVisibleInTemporalRange()

bool QgsVectorLayerTemporalProperties::isVisibleInTemporalRange ( const QgsDateTimeRange &  range ) const

overridevirtual

Returns true if the layer should be visible and rendered for the specified time range.

Reimplemented from QgsMapLayerTemporalProperties.

Definition at line 30 of file qgsvectorlayertemporalproperties.cpp.

limitMode()

Qgis::VectorTemporalLimitMode QgsVectorLayerTemporalProperties::limitMode

(

)

const

Returns the temporal limit mode (to include or exclude begin/end limits).

See also

setLimitMode()

Since

QGIS 3.22

Definition at line 232 of file qgsvectorlayertemporalproperties.cpp.

mode()

Qgis::VectorTemporalMode QgsVectorLayerTemporalProperties::mode

(

)

const

Returns the temporal properties mode.

See also

setMode()

Definition at line 220 of file qgsvectorlayertemporalproperties.cpp.

readXml()

bool QgsVectorLayerTemporalProperties::readXml ( const QDomElement &  element, const QgsReadWriteContext &  context  )

overridevirtual

Reads temporal properties from a DOM element previously written by writeXml().

See also

writeXml()

Implements QgsMapLayerTemporalProperties.

Definition at line 259 of file qgsvectorlayertemporalproperties.cpp.

setAccumulateFeatures()

void QgsVectorLayerTemporalProperties::setAccumulateFeatures

(

bool

accumulate

)

Sets whether features will be accumulated over time (i.e.

all features which occur before or within the map's temporal range should be rendered).

Warning

This setting is only effective when mode() is QgsVectorLayerTemporalProperties::ModeFeatureDateTimeInstantFromField

See also

accumulateFeatures()

Definition at line 380 of file qgsvectorlayertemporalproperties.cpp.

setDefaultsFromDataProviderTemporalCapabilities()

void QgsVectorLayerTemporalProperties::setDefaultsFromDataProviderTemporalCapabilities ( const QgsDataProviderTemporalCapabilities *  capabilities )

overridevirtual

Sets the layers temporal settings to appropriate defaults based on a provider's temporal capabilities.

Implements QgsMapLayerTemporalProperties.

Definition at line 332 of file qgsvectorlayertemporalproperties.cpp.

setDurationField()

void QgsVectorLayerTemporalProperties::setDurationField

(

const QString &

field

)

Sets the name of the duration field, which contains the duration of the event.

Units are specified by setDurationUnits()

Warning

This setting is only effective when mode() is QgsVectorLayerTemporalProperties::ModeFeatureDateTimeStartAndDurationFromFields

See also

durationField()

setDurationUnits()

Definition at line 420 of file qgsvectorlayertemporalproperties.cpp.

setDurationUnits()

void QgsVectorLayerTemporalProperties::setDurationUnits

(

QgsUnitTypes::TemporalUnit

units

)

Sets the units of the event's duration.

See also

durationUnits()

Definition at line 430 of file qgsvectorlayertemporalproperties.cpp.

setEndExpression()

void QgsVectorLayerTemporalProperties::setEndExpression

(

const QString &

endExpression

)

Sets the expression to use for the end time for the feature's time spans.

Warning

This setting is only effective when mode() is QgsVectorLayerTemporalProperties::ModeFeatureDateTimeStartAndEndFromExpressions

See also

endExpression()

setStartExpression()

Definition at line 370 of file qgsvectorlayertemporalproperties.cpp.

setEndField()

void QgsVectorLayerTemporalProperties::setEndField

(

const QString &

field

)

Sets the name of the end datetime field, which contains the end time for the feature's time spans.

See also

endField()

setStartField()

Definition at line 410 of file qgsvectorlayertemporalproperties.cpp.

setFixedDuration()

void QgsVectorLayerTemporalProperties::setFixedDuration

(

double

duration

)

Sets the fixed event duration, which contains the duration of the event.

Units are specified by setDurationUnits()

Warning

This setting is only effective when mode() is QgsVectorLayerTemporalProperties::ModeFeatureDateTimeInstantFromField

See also

fixedDuration()

setDurationUnits()

Definition at line 390 of file qgsvectorlayertemporalproperties.cpp.

setFixedTemporalRange()

void QgsVectorLayerTemporalProperties::setFixedTemporalRange

(

const QgsDateTimeRange &

range

)

Sets a temporal range to apply to the whole layer.

All features from the layer will be rendered whenever the current datetime range of a render context intersects the specified range.

Warning

This setting is only effective when mode() is QgsVectorLayerTemporalProperties::ModeFixedTemporalRange

See also

fixedTemporalRange()

Definition at line 249 of file qgsvectorlayertemporalproperties.cpp.

setLimitMode()

void QgsVectorLayerTemporalProperties::setLimitMode

(

Qgis::VectorTemporalLimitMode

mode

)

Sets the temporal limit mode (to include or exclude begin/end limits).

See also

limitMode()

Since

QGIS 3.22

Definition at line 237 of file qgsvectorlayertemporalproperties.cpp.

setMode()

void QgsVectorLayerTemporalProperties::setMode

(

Qgis::VectorTemporalMode

mode

)

Sets the temporal properties mode.

See also

mode()

Definition at line 225 of file qgsvectorlayertemporalproperties.cpp.

setStartExpression()

void QgsVectorLayerTemporalProperties::setStartExpression

(

const QString &

expression

)

Sets the expression to use for the start time for the feature's time spans.

Warning

This setting is only effective when mode() is QgsVectorLayerTemporalProperties::ModeFeatureDateTimeStartAndEndFromExpressions

See also

startExpression()

setEndExpression()

Definition at line 360 of file qgsvectorlayertemporalproperties.cpp.

setStartField()

void QgsVectorLayerTemporalProperties::setStartField

(

const QString &

field

)

Sets the name of the start datetime field, which contains the start time for the feature's time spans.

If mode() is ModeFeatureDateTimeInstantFromField, then this field represents both the start AND end times.

See also

startField()

setEndField()

Definition at line 400 of file qgsvectorlayertemporalproperties.cpp.

startExpression()

QString QgsVectorLayerTemporalProperties::startExpression

(

)

const

Returns the expression for the start time for the feature's time spans.

Warning

This setting is only effective when mode() is QgsVectorLayerTemporalProperties::ModeFeatureDateTimeStartAndEndFromExpressions

See also

setStartExpression()

endExpression()

Definition at line 355 of file qgsvectorlayertemporalproperties.cpp.

startField()

QString QgsVectorLayerTemporalProperties::startField

(

)

const

Returns the name of the start datetime field, which contains the start time for the feature's time spans.

If mode() is ModeFeatureDateTimeInstantFromField, then this field represents both the start AND end times.

See also

setStartField()

endField()

Definition at line 395 of file qgsvectorlayertemporalproperties.cpp.

writeXml()

QDomElement QgsVectorLayerTemporalProperties::writeXml ( QDomElement &  element, QDomDocument &  doc, const QgsReadWriteContext &  context  )

overridevirtual

Writes the properties to a DOM element, to be used later with readXml().

See also

readXml()

Implements QgsMapLayerTemporalProperties.

Definition at line 293 of file qgsvectorlayertemporalproperties.cpp.

---

The documentation for this class was generated from the following files:

• /build/qgis-3.28.0+99sid/src/core/vector/qgsvectorlayertemporalproperties.h
• /build/qgis-3.28.0+99sid/src/core/vector/qgsvectorlayertemporalproperties.cpp