Subgroup: Project
Class: QgsProject¶
-
class
qgis.core.
QgsProject
¶ Bases:
PyQt5.QtCore.QObject
,qgis._core.QgsExpressionContextGenerator
Reads and writes project states.
note
Has two general kinds of state to make persistent. (I.e., to read and write.) First, QGIS proprietary information. Second plug-in information.
A singleton since there shall only be one active project at a time; and provides canonical location for plug-ins and main app to find/set properties.
Methods
addMapLayer
Add a layer to the map of loaded layers. addMapLayers
Add a list of layers to the map of loaded layers. annotationManager
Returns pointer to the project’s annotation manager. areaUnits
Convenience function to query default area measurement units for project. autoTransaction
Transactional editing means that on supported datasources (postgres databases) the edit state of all tables that originate from the same database are synchronized and executed in a server side transaction. auxiliaryStorage
Returns the current auxiliary storage. avoidIntersectionsLayers
A list of layers with which intersections should be avoided. blockSignals
childEvent
children
clear
Clear the project - removes all settings and resets it back to an empty, default state. connectNotify
count
Returns the number of registered layers. createEmbeddedGroup
Create layer group instance defined in an arbitrary project file. createExpressionContext
crs
Returns the project’s native coordinate reference system. customEvent
customVariables
A map of custom project variables. defaultCrsForNewLayers
Returns the default CRS for new layers based on the settings and deleteLater
disconnect
disconnectNotify
distanceUnits
Convenience function to query default distance measurement units for project. dumpObjectInfo
dumpObjectTree
dumpProperties
dynamicPropertyNames
ellipsoid
Returns a proj string representing the project’s ellipsoid setting, e.g., “WGS84”. entryList
Return keys with values – do not return keys that contain other keys error
Return error message from previous read/write evaluateDefaultValues
Should default values be evaluated on provider side when requested and not when committed. event
eventFilter
fileInfo
Returns QFileInfo object for the project’s associated file. fileName
Returns the project’s file name. findChild
findChild(self, Tuple, name: str = ‘’, options: Union[Qt.FindChildOptions, Qt.FindChildOption] = Qt.FindChildrenRecursively) -> QObject findChildren
findChildren(self, Tuple, name: str = ‘’, options: Union[Qt.FindChildOptions, Qt.FindChildOption] = Qt.FindChildrenRecursively) -> List[QObject] homePath
Return project’s home path inherits
installEventFilter
instance
Returns the QgsProject singleton instance isDirty
Returns true if the project has been modified since the last write() isSignalConnected
isWidgetType
isWindowType
isZipped
Returns true if the project comes from a zip archive, false otherwise. killTimer
labelingEngineSettings
Returns project’s global labeling engine settings layerIsEmbedded
Returns project file path if layer is embedded from other project file. layerStore
Returns a pointer to the project’s internal layer store. layerTreeRegistryBridge
Return pointer to the helper class that synchronizes map layer registry with layer tree layerTreeRoot
Return pointer to the root (invisible) node of the project’s layer tree layoutManager
Returns the project’s layout manager, which manages compositions within the project. mapLayer
Retrieve a pointer to a registered layer by layer ID. mapLayers
Returns a map of all registered layers by layer ID. mapLayersByName
Retrieve a list of matching registered layers by layer name. mapThemeCollection
Returns pointer to the project’s map theme collection. metaObject
moveToThread
nonIdentifiableLayers
Get the list of layers which currently should not be taken into account on map identification objectName
parent
pathResolver
Return path resolver object with considering whether the project uses absolute or relative paths and using current project’s path. property
pyqtConfigure
Each keyword argument is either the name of a Qt property or a Qt signal. read
Reads given project file from the given file. readBoolEntry
readDoubleEntry
readEntry
readLayer
Reads the layer described in the associated DOM node. readListEntry
Key value accessors readNumEntry
readPath
Turn filename read from the project file to an absolute path receivers
relationManager
reloadAllLayers
Reload all registered layer’s provider data caches, synchronising the layer with any changes in the datasource. removeAllMapLayers
Removes all registered layers. removeEntry
Remove the given key removeEventFilter
removeMapLayer
Remove a layer from the registry by layer ID. removeMapLayers
Remove a set of layers from the registry by layer ID. sender
senderSignalIndex
setAreaUnits
Sets the default area measurement units for the project. setAutoTransaction
Transactional editing means that on supported datasources (postgres databases) the edit state of all tables that originate from the same database are synchronized and executed in a server side transaction. setAvoidIntersectionsLayers
A list of layers with which intersections should be avoided. setBadLayerHandler
Change handler for missing layers. setCrs
Sets the project’s native coordinate reference system. setCustomVariables
A map of custom project variables. setDirty
Flag the project as dirty (modified). setDistanceUnits
Sets the default distance measurement units for the project. setEllipsoid
Sets the project’s ellipsoid from a proj string representation, e.g., “WGS84”. setEvaluateDefaultValues
Defines if default values should be evaluated on provider side when requested and not when committed. setFileName
Sets the file name associated with the project. setLabelingEngineSettings
Sets project’s global labeling engine settings setNonIdentifiableLayers
Set a list of layers which should not be taken into account on map identification setObjectName
setParent
setProperty
setSnappingConfig
The snapping configuration for this project. setTitle
Sets the project’s title. setTopologicalEditing
Convenience function to set topological editing setTransformContext
Sets the project’s coordinate transform context
, which stores various information regarding which datum transforms should be used when transforming points from a source to destination coordinate reference system.setTrustLayerMetadata
Sets the trust option allowing to indicate if the extent has to be read from the XML document when data source has no metadata or if the data provider has to determine it. signalsBlocked
snappingConfig
The snapping configuration for this project. startTimer
subkeyList
Return keys with keys – do not return keys that contain only values takeMapLayer
Takes a layer from the registry. thread
timerEvent
title
Returns the project’s title. topologicalEditing
Convenience function to query topological editing status tr
transformContext
Returns a copy of the project’s coordinate transform context, which stores various information regarding which datum transforms should be used when transforming points from a source to destination coordinate reference system. trustLayerMetadata
Returns true if the trust option is activated, false otherwise. write
Writes the project to a file. writeEntry
Write an integer entry to the project file. writeEntryBool
Write a boolean entry to the project file. writeEntryDouble
Write a double entry to the project file. writePath
Prepare a filename to save it to the project file. Attributes
avoidIntersectionsLayersChanged
Emitted whenever avoidIntersectionsLayers has changed. crsChanged
Emitted when the CRS of the project has changed. customVariablesChanged
Emitted whenever the expression variables stored in the project have been changed. destroyed
destroyed(self, QObject = None) [signal] ellipsoidChanged
Emitted when the project ellipsoid
is changed.fileNameChanged
Emitted when the file name of the project changes [signal] homePathChanged
Emitted when the home path of the project changes [signal] labelingEngineSettingsChanged
Emitted when global configuration of the labeling engine changes. layerLoaded
Emitted when a layer from a projects was read. layerRemoved
Emitted after a layer was removed from the registry. layerWasAdded
Emitted when a layer was added to the registry. layerWillBeRemoved
Emitted when a layer is about to be removed from the registry. layersAdded
Emitted when one or more layers were added to the registry. layersRemoved
Emitted after one or more layers were removed from the registry. layersWillBeRemoved
Emitted when one or more layers are about to be removed from the registry. legendLayersAdded
Emitted, when a layer was added to the registry and the legend. loadingLayer
loadingLayer(self, str) [signal] mapThemeCollectionChanged
Emitted when the map theme collection changes. missingDatumTransforms
Emitted when datum transforms stored in the project are not available locally. nonIdentifiableLayersChanged
Emitted when the list of layer which are excluded from map identification changes [signal] objectNameChanged
objectNameChanged(self, str) [signal] oldProjectVersionWarning
emitted when an old project file is read. [signal] projectSaved
emitted when the project file has been written and closed [signal] readMapLayer
Emitted, after the basic initialization of a layer from the project file is done. readProject
emitted when project is being read [signal] removeAll
removeAll(self) [signal] snappingConfigChanged
emitted whenever the configuration for snapping has changed [signal] staticMetaObject
topologicalEditingChanged
Emitted when the topological editing flag has changed. transactionGroupsChanged
Emitted whenever a new transaction group has been created or a transaction group has been removed. transformContextChanged
Emitted when the project transformContext() is changed. writeMapLayer
Emitted, when a layer is being saved. writeProject
emitted when project is being written [signal] -
addMapLayer
(self, mapLayer: QgsMapLayer, addToLegend: bool = True) → QgsMapLayer¶ Add a layer to the map of loaded layers.
The layersAdded() and layerWasAdded() signals will always be emitted. The legendLayersAdded() signal is emitted only if addToLegend is true. If you are adding multiple layers at once, you should use addMapLayers() instead.
Parameters: - mapLayer – A layer to add to the registry
- addToLegend – If true (by default), the layer will be added to the
legend and to the main canvas. If you have a private layer you can set this parameter to false to hide it. :param takeOwnership: Ownership will be transferred to the layer registry. If you specify false here you have take care of deleting the layer yourself. Not available in Python.
Returns: None if unable to add layer, otherwise pointer to newly added layer See also
Note
As a side-effect QgsProject is made dirty.
Note
Use addMapLayers if adding more than one layer at a time
Note
takeOwnership is not available in the Python bindings - the registry will always take ownership
See also
-
addMapLayers
(self, mapLayers: Iterable[QgsMapLayer], addToLegend: bool = True) → List[QgsMapLayer]¶ Add a list of layers to the map of loaded layers.
The layersAdded() and layerWasAdded() signals will always be emitted. The legendLayersAdded() signal is emitted only if addToLegend is true.
Parameters: - mapLayers – A list of layer which should be added to the registry
- addToLegend – If true (by default), the layers will be added to the
legend and to the main canvas. If you have a private layer you can set this parameter to false to hide it. :param takeOwnership: Ownership will be transferred to the layer registry. If you specify false here you have take care of deleting the layers yourself. Not available in Python.
Returns: a list of the map layers that were added successfully. If a layer is invalid, or already exists in the registry, it will not be part of the returned QList.
Note
As a side-effect QgsProject is made dirty.
Note
takeOwnership is not available in the Python bindings - the registry will always take ownership
New in version 1.8.
See also
-
annotationManager
(self) → QgsAnnotationManager¶ Returns pointer to the project’s annotation manager.
New in version 3.0.
-
areaUnits
(self) → QgsUnitTypes.AreaUnit¶ Convenience function to query default area measurement units for project.
New in version 2.14.
See also
-
autoTransaction
(self) → bool¶ Transactional editing means that on supported datasources (postgres databases) the edit state of all tables that originate from the same database are synchronized and executed in a server side transaction.
New in version 2.16.
-
auxiliaryStorage
(self) → QgsAuxiliaryStorage¶ Returns the current auxiliary storage.
New in version 3.0.
-
avoidIntersectionsLayers
(self) → List[QgsVectorLayer]¶ A list of layers with which intersections should be avoided.
New in version 3.0.
-
avoidIntersectionsLayersChanged
¶ Emitted whenever avoidIntersectionsLayers has changed.
New in version 3.0: [signal]
-
childEvent
()¶
-
clear
(self)¶ Clear the project - removes all settings and resets it back to an empty, default state.
New in version 2.4.
-
connectNotify
()¶
-
count
(self) → int¶ Returns the number of registered layers.
-
createEmbeddedGroup
(self, groupName: str, projectFilePath: str, invisibleLayers: Iterable[str]) → QgsLayerTreeGroup¶ Create layer group instance defined in an arbitrary project file.
New in version 2.4.
-
createExpressionContext
(self) → QgsExpressionContext¶
-
crs
(self) → QgsCoordinateReferenceSystem¶ Returns the project’s native coordinate reference system.
New in version 3.0.
See also
See also
-
crsChanged
¶ Emitted when the CRS of the project has changed.
New in version 3.0: [signal]
-
customEvent
()¶
-
customVariables
(self) → Dict[str, Any]¶ A map of custom project variables. To get all available variables including generated ones use QgsExpressionContextUtils.projectScope() instead.
-
customVariablesChanged
¶ Emitted whenever the expression variables stored in the project have been changed.
New in version 3.0: [signal]
-
defaultCrsForNewLayers
(self) → QgsCoordinateReferenceSystem¶ Returns the default CRS for new layers based on the settings and the current project CRS
-
disconnectNotify
()¶
-
distanceUnits
(self) → QgsUnitTypes.DistanceUnit¶ Convenience function to query default distance measurement units for project.
New in version 2.14.
See also
See also
-
dumpProperties
(self)¶
-
ellipsoid
(self) → str¶ Returns a proj string representing the project’s ellipsoid setting, e.g., “WGS84”.
See also
See also
New in version 3.0.
-
ellipsoidChanged
¶ Emitted when the project
ellipsoid
is changed.New in version 3.0.
See also
See also
ellipsoid()
[signal]
-
entryList
(self, scope: str, key: str) → List[str]¶ Return keys with values – do not return keys that contain other keys
Note
equivalent to QgsSettings entryList()
-
error
(self) → str¶ Return error message from previous read/write
-
evaluateDefaultValues
(self) → bool¶ Should default values be evaluated on provider side when requested and not when committed.
New in version 2.16.
-
fileInfo
(self) → QFileInfo¶ Returns QFileInfo object for the project’s associated file.
See also
New in version 2.9.
-
fileName
(self) → str¶ Returns the project’s file name. This is the file which contains the project’s XML representation.
See also
See also
-
fileNameChanged
¶ Emitted when the file name of the project changes [signal]
-
homePath
(self) → str¶ Return project’s home path
Returns: home path of project (or null QString if not set) *
-
homePathChanged
¶ Emitted when the home path of the project changes [signal]
-
instance
() → QgsProject¶ Returns the QgsProject singleton instance
-
isDirty
(self) → bool¶ Returns true if the project has been modified since the last write()
-
isSignalConnected
()¶
-
isZipped
(self) → bool¶ Returns true if the project comes from a zip archive, false otherwise.
-
labelingEngineSettings
(self) → QgsLabelingEngineSettings¶ Returns project’s global labeling engine settings
New in version 3.0.
-
labelingEngineSettingsChanged
¶ Emitted when global configuration of the labeling engine changes.
New in version 3.0: [signal]
-
layerIsEmbedded
(self, id: str) → str¶ Returns project file path if layer is embedded from other project file. Returns empty string if layer is not embedded
-
layerLoaded
¶ Emitted when a layer from a projects was read.
Parameters: - i – current layer
- n – number of layers [signal]
-
layerRemoved
¶ Emitted after a layer was removed from the registry.
Parameters: layerId – The ID of the layer removed. Note
Consider using layersRemoved() instead
See also
layerWillBeRemoved()
[signal]
-
layerStore
(self) → QgsMapLayerStore¶ Returns a pointer to the project’s internal layer store. /since QGIS 3.0
-
layerTreeRegistryBridge
(self) → QgsLayerTreeRegistryBridge¶ Return pointer to the helper class that synchronizes map layer registry with layer tree
New in version 2.4.
-
layerTreeRoot
(self) → QgsLayerTree¶ Return pointer to the root (invisible) node of the project’s layer tree
New in version 2.4.
-
layerWasAdded
¶ Emitted when a layer was added to the registry.
Note
Consider using layersAdded() instead
See also
layersAdded()
[signal]
-
layerWillBeRemoved
¶ Emitted when a layer is about to be removed from the registry.
Parameters: layerId – The ID of the layer to be removed. Note
Consider using layersWillBeRemoved() instead
See also
See also
layerRemoved()
[signal]Emitted when a layer is about to be removed from the registry.
Parameters: layer – The layer to be removed. Note
Consider using layersWillBeRemoved() instead
See also
See also
layerRemoved()
[signal]
-
layersAdded
¶ Emitted when one or more layers were added to the registry. This signal is also emitted for layers added to the registry, but not to the legend.
Parameters: layers – List of layers which have been added. See also
See also
layerWasAdded()
[signal]
-
layersRemoved
¶ Emitted after one or more layers were removed from the registry.
Parameters: layerIds – A list of IDs of the layers which were removed. See also
layersWillBeRemoved()
[signal]
-
layersWillBeRemoved
¶ Emitted when one or more layers are about to be removed from the registry.
Parameters: layerIds – A list of IDs for the layers which are to be removed. See also
See also
layersRemoved()
[signal]Emitted when one or more layers are about to be removed from the registry.
Parameters: layers – A list of layers which are to be removed. See also
See also
layersRemoved()
[signal]
-
layoutManager
(self) → QgsLayoutManager¶ Returns the project’s layout manager, which manages compositions within the project.
New in version 3.0.
-
legendLayersAdded
¶ Emitted, when a layer was added to the registry and the legend. Layers can also be private layers, which are signalled by layersAdded() and layerWasAdded() but will not be advertised by this signal.
Parameters: layers – List of QgsMapLayer which were added to the legend. [signal]
-
loadingLayer
¶ loadingLayer(self, str) [signal]
-
mapLayer
(self, layerId: str) → QgsMapLayer¶ Retrieve a pointer to a registered layer by layer ID.
Parameters: layerId – ID of layer to retrieve Returns: matching layer, or None if no matching layer found See also
See also
-
mapLayers
(self) → object¶ Returns a map of all registered layers by layer ID.
See also
See also
See also
layers()
-
mapLayersByName
(self, layerName: str) → List[QgsMapLayer]¶ Retrieve a list of matching registered layers by layer name.
Parameters: layerName – name of layers to match Returns: list of matching layers See also
See also
-
mapThemeCollection
(self) → QgsMapThemeCollection¶ Returns pointer to the project’s map theme collection.
New in version 2.12.
Note
renamed in QGIS 3.0, formerly
QgsVisibilityPresetCollection
-
mapThemeCollectionChanged
¶ Emitted when the map theme collection changes. This only happens when the map theme collection is reset. Any pointer previously received from mapThemeCollection() must no longer be used after this signal is emitted. You must still connect to signals from the map theme collection if you want to be notified about new map themes being added and map themes being removed.
New in version 3.0: [signal]
-
missingDatumTransforms
¶ Emitted when datum transforms stored in the project are not available locally.
New in version 3.0: [signal]
-
nonIdentifiableLayers
(self) → List[str]¶ Get the list of layers which currently should not be taken into account on map identification
-
nonIdentifiableLayersChanged
¶ Emitted when the list of layer which are excluded from map identification changes [signal]
-
oldProjectVersionWarning
¶ emitted when an old project file is read. [signal]
-
pathResolver
(self) → QgsPathResolver¶ Return path resolver object with considering whether the project uses absolute or relative paths and using current project’s path.
New in version 3.0.
-
projectSaved
¶ emitted when the project file has been written and closed [signal]
-
read
(self, filename: str) → bool¶ Reads given project file from the given file.
Parameters: filename – name of project file to read Returns: true if project file has been read successfully read(self) -> bool Reads the project from its currently associated file (see fileName() ).
Returns: true if project file has been read successfully
-
readBoolEntry
(self, scope: str, key: str, def_: bool = False) → Tuple[bool, bool]¶
-
readDoubleEntry
(self, scope: str, key: str, def_: float = 0) → Tuple[float, bool]¶
-
readEntry
(self, scope: str, key: str, def_: str = '') → Tuple[str, bool]¶
-
readLayer
(self, layerNode: QDomNode) → bool¶ Reads the layer described in the associated DOM node.
Note
This method is mainly for use by QgsProjectBadLayerHandler subclasses that may fix definition of bad layers with the user’s help in GUI. Calling this method with corrected DOM node adds the layer back to the project.
Parameters: layerNode – represents a QgsProject DOM node that encodes a specific layer.
-
readListEntry
(self, scope: str, key: str, def_: Iterable[str] = []) → Tuple[List[str], bool]¶ Key value accessors
keys would be the familiar QgsSettings-like ‘/’ delimited entries, implying a hierarchy of keys and corresponding values
-
readMapLayer
¶ Emitted, after the basic initialization of a layer from the project file is done. You can use this signal to read additional information from the project file.
Parameters: - mapLayer – The map layer which is being initialized
- layerNode – The layer node from the project file [signal]
-
readNumEntry
(self, scope: str, key: str, def_: int = 0) → Tuple[int, bool]¶
-
readPath
(self, filename: str) → str¶ Turn filename read from the project file to an absolute path
-
readProject
¶ emitted when project is being read [signal]
-
receivers
()¶
-
relationManager
(self) → QgsRelationManager¶
-
reloadAllLayers
(self)¶ Reload all registered layer’s provider data caches, synchronising the layer with any changes in the datasource.
See also
-
removeAll
¶ removeAll(self) [signal]
-
removeAllMapLayers
(self)¶ Removes all registered layers. If the registry has ownership of any layers these layers will also be deleted.
Note
As a side-effect the QgsProject instance is marked dirty.
Note
Calling this method will cause the removeAll() signal to be emitted.
See also
See also
-
removeEntry
(self, scope: str, key: str) → bool¶ Remove the given key
-
removeMapLayer
(self, layerId: str)¶ Remove a layer from the registry by layer ID.
The specified layer will be removed from the registry. If the registry has ownership of the layer then it will also be deleted.
Parameters: layerId – ID of the layer to remove Note
As a side-effect the QgsProject instance is marked dirty.
See also
See also
removeMapLayer(self, layer: QgsMapLayer) Remove a layer from the registry.
The specified layer will be removed from the registry. If the registry has ownership of the layer then it will also be deleted.
Parameters: layer – The layer to remove. Null pointers are ignored. Note
As a side-effect the QgsProject instance is marked dirty.
See also
See also
-
removeMapLayers
(self, layerIds: Iterable[str])¶ Remove a set of layers from the registry by layer ID.
The specified layers will be removed from the registry. If the registry has ownership of any layers these layers will also be deleted.
Parameters: layerIds – list of IDs of the layers to remove Note
As a side-effect the QgsProject instance is marked dirty.
New in version 1.8.
See also
See also
removeMapLayers(self, layers: Iterable[QgsMapLayer])
-
sender
()¶
-
senderSignalIndex
()¶
-
setAreaUnits
(self, unit: QgsUnitTypes.AreaUnit)¶ Sets the default area measurement units for the project.
New in version 3.0.
See also
See also
-
setAutoTransaction
(self, autoTransaction: bool)¶ Transactional editing means that on supported datasources (postgres databases) the edit state of all tables that originate from the same database are synchronized and executed in a server side transaction.
Make sure that this is only called when all layers are not in edit mode.
New in version 2.16.
-
setAvoidIntersectionsLayers
(self, layers: Iterable[QgsVectorLayer])¶ A list of layers with which intersections should be avoided.
New in version 3.0.
-
setBadLayerHandler
(self, handler: QgsProjectBadLayerHandler)¶ Change handler for missing layers. Deletes old handler and takes ownership of the new one.
-
setCrs
(self, crs: QgsCoordinateReferenceSystem)¶ Sets the project’s native coordinate reference system.
New in version 3.0.
See also
See also
-
setCustomVariables
(self, customVariables: Dict[str, Any])¶ A map of custom project variables. Be careful not to set generated variables.
-
setDirty
(self, b: bool = True)¶ Flag the project as dirty (modified). If this flag is set, the user will be asked to save changes to the project before closing the current project.
New in version 2.4.
Note
promoted to public slot in 2.16
-
setDistanceUnits
(self, unit: QgsUnitTypes.DistanceUnit)¶ Sets the default distance measurement units for the project.
New in version 3.0.
See also
See also
-
setEllipsoid
(self, ellipsoid: str)¶ Sets the project’s ellipsoid from a proj string representation, e.g., “WGS84”.
See also
See also
New in version 3.0.
-
setEvaluateDefaultValues
(self, evaluateDefaultValues: bool)¶ Defines if default values should be evaluated on provider side when requested and not when committed.
New in version 2.16.
-
setFileName
(self, name: str)¶ Sets the file name associated with the project. This is the file which contains the project’s XML representation.
Parameters: name – project file name See also
-
setLabelingEngineSettings
(self, settings: QgsLabelingEngineSettings)¶ Sets project’s global labeling engine settings
New in version 3.0.
-
setNonIdentifiableLayers
(self, layers: Iterable[QgsMapLayer])¶ Set a list of layers which should not be taken into account on map identification
setNonIdentifiableLayers(self, layerIds: Iterable[str]) Set a list of layers which should not be taken into account on map identification
-
setSnappingConfig
(self, snappingConfig: QgsSnappingConfig)¶ The snapping configuration for this project.
New in version 3.0.
-
setTitle
(self, title: str)¶ Sets the project’s title.
Parameters: title – new title New in version 2.4.
See also
-
setTopologicalEditing
(self, enabled: bool)¶ Convenience function to set topological editing
-
setTransformContext
(self, context: QgsCoordinateTransformContext)¶ Sets the project’s coordinate transform
context
, which stores various information regarding which datum transforms should be used when transforming points from a source to destination coordinate reference system.New in version 3.0.
See also
See also
-
setTrustLayerMetadata
(self, trust: bool)¶ Sets the trust option allowing to indicate if the extent has to be read from the XML document when data source has no metadata or if the data provider has to determine it. Moreover, when this option is activated, primary key unicity is not checked for views and materialized views with Postgres provider.
Parameters: trust – True to trust the project, false otherwise New in version 3.0.
-
snappingConfig
(self) → QgsSnappingConfig¶ The snapping configuration for this project.
New in version 3.0.
-
snappingConfigChanged
¶ emitted whenever the configuration for snapping has changed [signal]
-
subkeyList
(self, scope: str, key: str) → List[str]¶ Return keys with keys – do not return keys that contain only values
Note
equivalent to QgsSettings subkeyList()
-
takeMapLayer
(self, layer: QgsMapLayer) → QgsMapLayer¶ Takes a layer from the registry. If the layer was owned by the project, the layer will be returned without deleting it. The caller takes ownership of the layer and is responsible for deleting it.
See also
New in version 3.0.
-
timerEvent
()¶
-
title
(self) → str¶ Returns the project’s title.
See also
-
topologicalEditing
(self) → bool¶ Convenience function to query topological editing status
-
topologicalEditingChanged
¶ Emitted when the topological editing flag has changed.
New in version 3.0: [signal]
-
transactionGroupsChanged
¶ Emitted whenever a new transaction group has been created or a transaction group has been removed.
New in version 3.0: [signal]
-
transformContext
(self) → QgsCoordinateTransformContext¶ Returns a copy of the project’s coordinate transform context, which stores various information regarding which datum transforms should be used when transforming points from a source to destination coordinate reference system.
New in version 3.0.
See also
See also
-
transformContextChanged
¶ Emitted when the project transformContext() is changed.
New in version 3.0.
See also
transformContext()
[signal]
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trustLayerMetadata
(self) → bool¶ Returns true if the trust option is activated, false otherwise. This option allows indicateing if the extent has to be read from the XML document when data source has no metadata or if the data provider has to determine it. Moreover, when this option is activated, primary key unicity is not checked for views and materialized views with Postgres provider.
New in version 3.0.
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write
(self, filename: str) → bool¶ Writes the project to a file.
Parameters: filename – destination file Returns: true if project was written successfully Note
calling this implicitly sets the project’s filename (see setFileName() )
Note
isDirty() will be set to false if project is successfully written
New in version 3.0.
write(self) -> bool Writes the project to its current associated file (see fileName() ).
Returns: true if project was written successfully Note
isDirty() will be set to false if project is successfully written
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writeEntry
(self, scope: str, key: str, value: int) → bool¶ Write an integer entry to the project file.
Keys are ‘/’-delimited entries, implying a hierarchy of keys and corresponding values
Note
The key string must be valid xml tag names in order to be saved to the file.
writeEntry(self, scope: str, key: str, value: str) -> bool Write a string entry to the project file.
Keys are ‘/’-delimited entries, implying a hierarchy of keys and corresponding values
Note
The key string must be valid xml tag names in order to be saved to the file.
writeEntry(self, scope: str, key: str, value: Iterable[str]) -> bool Write a string list entry to the project file.
Keys are ‘/’-delimited entries, implying a hierarchy of keys and corresponding values
Note
The key string must be valid xml tag names in order to be saved to the file.
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writeEntryBool
(self, scope: str, key: str, value: bool) → bool¶ Write a boolean entry to the project file.
Keys are ‘/’-delimited entries, implying a hierarchy of keys and corresponding values
Note
The key string must be valid xml tag names in order to be saved to the file.
Note
available in Python bindings as writeEntryBool
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writeEntryDouble
(self, scope: str, key: str, value: float) → bool¶ Write a double entry to the project file.
Keys are ‘/’-delimited entries, implying a hierarchy of keys and corresponding values
Note
The key string must be valid xml tag names in order to be saved to the file.
Note
available in Python bindings as writeEntryDouble
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writeMapLayer
¶ Emitted, when a layer is being saved. You can use this method to save additional information to the layer.
Parameters: - mapLayer – The map layer which is being initialized
- layerElem – The layer element from the project file
- doc – The document [signal]
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writePath
(self, filename: str) → str¶ Prepare a filename to save it to the project file. Creates an absolute or relative path according to the project settings. Paths written to the project file should be prepared with this method.
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writeProject
¶ emitted when project is being written [signal]
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