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qgsproject.h
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qgsproject.h
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/***************************************************************************
qgsproject.h
Implements persistent project state.
-------------------
begin : July 23, 2004
copyright : (C) 2004 by Mark Coletti
email : mcoletti at gmail.com
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#ifndef QGSPROJECT_H
#define QGSPROJECT_H
#include "qgis_core.h"
#include "qgis_sip.h"
#include "qgis.h"
#include <memory>
#include <QHash>
#include <QList>
#include <QObject>
#include <QPair>
#include <QFileInfo>
#include <QStringList>
#include "qgsunittypes.h"
#include "qgssnappingconfig.h"
#include "qgsprojectversion.h"
#include "qgsexpressioncontextgenerator.h"
#include "qgscoordinatereferencesystem.h"
#include "qgscoordinatetransformcontext.h"
#include "qgsprojectproperty.h"
#include "qgsmaplayer.h"
#include "qgsmaplayerstore.h"
#include "qgsarchive.h"
#include "qgsreadwritecontext.h"
#include "qgsprojectmetadata.h"
class QFileInfo;
class QDomDocument;
class QDomElement;
class QDomNode;
class QgsLayerTreeGroup;
class QgsLayerTreeRegistryBridge;
class QgsMapLayer;
class QgsMapThemeCollection;
class QgsPathResolver;
class QgsProjectBadLayerHandler;
class QgsProjectStorage;
class QgsRelationManager;
class QgsTolerance;
class QgsTransactionGroup;
class QgsVectorLayer;
class QgsAnnotationManager;
class QgsLayoutManager;
class QgsLayerTree;
class QgsLabelingEngineSettings;
class QgsAuxiliaryStorage;
/**
* \ingroup core
* 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.
*/
class CORE_EXPORT QgsProject : public QObject, public QgsExpressionContextGenerator
{
Q_OBJECT
Q_PROPERTY( QStringList nonIdentifiableLayers READ nonIdentifiableLayers WRITE setNonIdentifiableLayers NOTIFY nonIdentifiableLayersChanged )
Q_PROPERTY( QString fileName READ fileName WRITE setFileName NOTIFY fileNameChanged )
Q_PROPERTY( QString homePath READ homePath WRITE setPresetHomePath NOTIFY homePathChanged )
Q_PROPERTY( QgsCoordinateReferenceSystem crs READ crs WRITE setCrs NOTIFY crsChanged )
Q_PROPERTY( QString ellipsoid READ ellipsoid WRITE setEllipsoid NOTIFY ellipsoidChanged )
Q_PROPERTY( QgsMapThemeCollection *mapThemeCollection READ mapThemeCollection NOTIFY mapThemeCollectionChanged )
Q_PROPERTY( QgsSnappingConfig snappingConfig READ snappingConfig WRITE setSnappingConfig NOTIFY snappingConfigChanged )
Q_PROPERTY( QgsRelationManager *relationManager READ relationManager )
Q_PROPERTY( QList<QgsVectorLayer *> avoidIntersectionsLayers READ avoidIntersectionsLayers WRITE setAvoidIntersectionsLayers NOTIFY avoidIntersectionsLayersChanged )
Q_PROPERTY( QgsProjectMetadata metadata READ metadata WRITE setMetadata NOTIFY metadataChanged )
public:
//! Returns the QgsProject singleton instance
static QgsProject *instance();
/**
* Create a new QgsProject.
*
* Most of the time you want to use QgsProject::instance() instead as many components of QGIS work with the singleton.
*/
explicit QgsProject( QObject *parent SIP_TRANSFERTHIS = nullptr );
~QgsProject() override;
/**
* Sets the project's title.
* \param title new title
*
* \note Since QGIS 3.2 this is just a shortcut to setting the title in the project's metadata().
*
* \see title()
* \since QGIS 2.4
*/
void setTitle( const QString &title );
/**
* Returns the project's title.
* \see setTitle()
*
* \note Since QGIS 3.2 this is just a shortcut to retrieving the title from the project's metadata().
*/
QString title() const;
/**
* Returns true if the project has been modified since the last write()
*/
bool isDirty() const;
/**
* Sets the file name associated with the project. This is the file which contains the project's XML
* representation.
* \param name project file name
* \see fileName()
*/
void setFileName( const QString &name );
/**
* Returns the project's file name. This is the file which contains the project's XML
* representation.
* \see setFileName()
* \see fileInfo()
*/
QString fileName() const;
/**
* Returns QFileInfo object for the project's associated file.
*
* \note The use of this method is discouraged since QGIS 3.2 as it only works with project files stored
* in the file system. It is recommended to use absoluteFilePath(), baseName(), lastModifiedTime() as
* replacements that are aware of the fact that projects may be saved in other project storages.
*
* \see fileName()
* \since QGIS 2.9
* \deprecated Use absoluteFilePath(), baseName() or lastModifiedTime() instead
*/
Q_DECL_DEPRECATED QFileInfo fileInfo() const SIP_DEPRECATED;
/**
* Returns pointer to project storage implementation that handles read/write of the project file.
* If the project file is stored in the local file system, returns null pointer.
* The project storage object is inferred from fileName() of the project.
* \since QGIS 3.2
*/
QgsProjectStorage *projectStorage() const;
/**
* Returns last modified time of the project file as returned by the file system (or other project storage).
* \since QGIS 3.2
*/
QDateTime lastModified() const;
/**
* Returns full absolute path to the project file if the project is stored in a file system - derived from fileName().
* Returns empty string when the project is stored in a project storage (there is no concept of paths for custom project storages).
* \since QGIS 3.2
*/
QString absoluteFilePath() const;
/**
* Returns the base name of the project file without the path and without extension - derived from fileName().
* \since QGIS 3.2
*/
QString baseName() const;
/**
* Returns the project's native coordinate reference system.
* \see setCrs()
* \see ellipsoid()
* \since QGIS 3.0
*/
QgsCoordinateReferenceSystem crs() const;
/**
* Sets the project's native coordinate reference system.
* \see crs()
* \see setEllipsoid()
* \since QGIS 3.0
*/
void setCrs( const QgsCoordinateReferenceSystem &crs );
/**
* Returns a proj string representing the project's ellipsoid setting, e.g., "WGS84".
* \see setEllipsoid()
* \see crs()
* \since QGIS 3.0
*/
QString ellipsoid() const;
/**
* Sets the project's ellipsoid from a proj string representation, e.g., "WGS84".
* \see ellipsoid()
* \see setCrs()
* \since QGIS 3.0
*/
void setEllipsoid( const QString &ellipsoid );
/**
* 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.
*
* \see setTransformContext()
* \see transformContextChanged()
* \since QGIS 3.0
*/
QgsCoordinateTransformContext transformContext() const;
/**
* Sets the project's coordinate transform \a context, which stores various
* information regarding which datum transforms should be used when transforming points
* from a source to destination coordinate reference system.
*
* \see transformContext()
* \see transformContextChanged()
* \since QGIS 3.0
*/
void setTransformContext( const QgsCoordinateTransformContext &context );
/**
* Clear the project - removes all settings and resets it back to an empty, default state.
* \since QGIS 2.4
*/
void clear();
/**
* Reads given project file from the given file.
* \param filename name of project file to read
* \returns true if project file has been read successfully
*/
bool read( const QString &filename );
/**
* Reads the project from its currently associated file (see fileName() ).
* \returns true if project file has been read successfully
*/
bool read();
/**
* 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.
*
* \param layerNode represents a QgsProject DOM node that encodes a specific layer.
*/
bool readLayer( const QDomNode &layerNode );
/**
* Writes the project to a file.
* \param 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
* \since QGIS 3.0
*/
bool write( const QString &filename );
/**
* 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
*/
bool write();
/**
* 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
*/
bool writeEntry( const QString &scope, const QString &key, bool value ) SIP_PYNAME( writeEntryBool );
/**
* 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
*/
bool writeEntry( const QString &scope, const QString &key, double value ) SIP_PYNAME( writeEntryDouble );
/**
* 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.
*/
bool writeEntry( const QString &scope, const QString &key, int value );
/**
* 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.
*/
bool writeEntry( const QString &scope, const QString &key, const QString &value );
/**
* 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.
*/
bool writeEntry( const QString &scope, const QString &key, const QStringList &value );
/**
* Key value accessors
*
* keys would be the familiar QgsSettings-like '/' delimited entries,
* implying a hierarchy of keys and corresponding values
*/
QStringList readListEntry( const QString &scope, const QString &key, const QStringList &def = QStringList(), bool *ok = nullptr ) const;
QString readEntry( const QString &scope, const QString &key, const QString &def = QString(), bool *ok = nullptr ) const;
int readNumEntry( const QString &scope, const QString &key, int def = 0, bool *ok = nullptr ) const;
double readDoubleEntry( const QString &scope, const QString &key, double def = 0, bool *ok = nullptr ) const;
bool readBoolEntry( const QString &scope, const QString &key, bool def = false, bool *ok = nullptr ) const;
//! Remove the given key
bool removeEntry( const QString &scope, const QString &key );
/**
* Returns keys with values -- do not return keys that contain other keys
*
* \note equivalent to QgsSettings entryList()
*/
QStringList entryList( const QString &scope, const QString &key ) const;
/**
* Returns keys with keys -- do not return keys that contain only values
*
* \note equivalent to QgsSettings subkeyList()
*/
QStringList subkeyList( const QString &scope, const QString &key ) const;
/**
* Dump out current project properties to stderr
*/
// TODO Now slightly broken since re-factoring. Won't print out top-level key
// and redundantly prints sub-keys.
void dumpProperties() const;
/**
* Returns path resolver object with considering whether the project uses absolute
* or relative paths and using current project's path.
* \since QGIS 3.0
*/
QgsPathResolver pathResolver() const;
/**
* 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.
*/
QString writePath( const QString &filename ) const;
//! Turn filename read from the project file to an absolute path
QString readPath( const QString &filename ) const;
//! Returns error message from previous read/write
QString error() const;
/**
* Change handler for missing layers.
* Deletes old handler and takes ownership of the new one.
*/
void setBadLayerHandler( QgsProjectBadLayerHandler *handler SIP_TRANSFER );
//! Returns project file path if layer is embedded from other project file. Returns empty string if layer is not embedded
QString layerIsEmbedded( const QString &id ) const;
/**
* Creates a maplayer instance defined in an arbitrary project file. Caller takes ownership
* \returns the layer or 0 in case of error
* \note not available in Python bindings
*/
bool createEmbeddedLayer( const QString &layerId, const QString &projectFilePath, QList<QDomNode> &brokenNodes,
bool saveFlag = true ) SIP_SKIP;
/**
* Create layer group instance defined in an arbitrary project file.
* \since QGIS 2.4
*/
QgsLayerTreeGroup *createEmbeddedGroup( const QString &groupName, const QString &projectFilePath, const QStringList &invisibleLayers );
//! Convenience function to set topological editing
void setTopologicalEditing( bool enabled );
//! Convenience function to query topological editing status
bool topologicalEditing() const;
/**
* Convenience function to query default distance measurement units for project.
* \see setDistanceUnits()
* \see areaUnits()
* \since QGIS 2.14
*/
QgsUnitTypes::DistanceUnit distanceUnits() const;
/**
* Sets the default distance measurement units for the project.
* \see distanceUnits()
* \see setAreaUnits()
* \since QGIS 3.0
*/
void setDistanceUnits( QgsUnitTypes::DistanceUnit unit );
/**
* Convenience function to query default area measurement units for project.
* \see distanceUnits()
* \since QGIS 2.14
*/
QgsUnitTypes::AreaUnit areaUnits() const;
/**
* Sets the default area measurement units for the project.
* \see areaUnits()
* \see setDistanceUnits()
* \since QGIS 3.0
*/
void setAreaUnits( QgsUnitTypes::AreaUnit unit );
/**
* Returns the project's home path. This will either be a manually set home path
* (see presetHomePath()) or the path containing the project file itself.
*
* This method always returns the absolute path to the project's home. See
* presetHomePath() to retrieve any manual project home path override (e.g.
* relative home paths).
*
* \see setPresetHomePath()
* \see presetHomePath()
* \see homePathChanged()
*/
QString homePath() const;
/**
* Returns any manual project home path setting, or an empty string if not set.
*
* This path may be a relative path. See homePath() to retrieve a path which is always
* an absolute path.
*
* \see homePath()
* \see setPresetHomePath()
* \see homePathChanged()
*
* \since QGIS 3.2
*/
QString presetHomePath() const;
QgsRelationManager *relationManager() const;
/**
* Returns the project's layout manager, which manages compositions within
* the project.
* \note not available in Python bindings
* \since QGIS 3.0
*/
const QgsLayoutManager *layoutManager() const SIP_SKIP;
/**
* Returns the project's layout manager, which manages compositions within
* the project.
* \since QGIS 3.0
*/
QgsLayoutManager *layoutManager();
/**
* Returns pointer to the root (invisible) node of the project's layer tree
* \since QGIS 2.4
*/
QgsLayerTree *layerTreeRoot() const;
/**
* Returns pointer to the helper class that synchronizes map layer registry with layer tree
* \since QGIS 2.4
*/
QgsLayerTreeRegistryBridge *layerTreeRegistryBridge() const { return mLayerTreeRegistryBridge; }
/**
* Returns pointer to the project's map theme collection.
* \note renamed in QGIS 3.0, formerly QgsVisibilityPresetCollection
* \since QGIS 2.12
*/
QgsMapThemeCollection *mapThemeCollection();
/**
* Returns pointer to the project's annotation manager.
* \since QGIS 3.0
*/
QgsAnnotationManager *annotationManager();
/**
* Returns a const pointer to the project's annotation manager.
* \since QGIS 3.0
*/
const QgsAnnotationManager *annotationManager() const SIP_SKIP;
/**
* Set a list of layers which should not be taken into account on map identification
*/
void setNonIdentifiableLayers( const QList<QgsMapLayer *> &layers );
/**
* Set a list of layers which should not be taken into account on map identification
*/
void setNonIdentifiableLayers( const QStringList &layerIds );
/**
* Gets the list of layers which currently should not be taken into account on map identification
*/
QStringList nonIdentifiableLayers() const;
/**
* 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.
*
* \since QGIS 2.16
*/
bool autoTransaction() const;
/**
* 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.
*
* \since QGIS 2.16
*/
void setAutoTransaction( bool autoTransaction );
/**
* Map of transaction groups
*
* QPair( providerKey, connString ) -> transactionGroup
*
* \note Not available in Python bindings
* \since QGIS 2.16
*/
QMap< QPair< QString, QString>, QgsTransactionGroup *> transactionGroups() SIP_SKIP;
/**
* Get a transaction group by getting provider & connection string.
* Returns null pointer if transaction group is not available.
*
* providerKey, connString -> transactionGroup
*
* \since QGIS 3.0
*/
QgsTransactionGroup *transactionGroup( const QString &providerKey, const QString &connString );
/**
* Should default values be evaluated on provider side when requested and not when committed.
*
* \since QGIS 2.16
*/
bool evaluateDefaultValues() const;
/**
* Defines if default values should be evaluated on provider side when requested and not when committed.
*
* \since QGIS 2.16
*/
void setEvaluateDefaultValues( bool evaluateDefaultValues );
QgsExpressionContext createExpressionContext() const override;
/**
* The snapping configuration for this project.
*
* \since QGIS 3.0
*/
QgsSnappingConfig snappingConfig() const;
/**
* A list of layers with which intersections should be avoided.
*
* \since QGIS 3.0
*/
QList<QgsVectorLayer *> avoidIntersectionsLayers() const;
/**
* A list of layers with which intersections should be avoided.
*
* \since QGIS 3.0
*/
void setAvoidIntersectionsLayers( const QList<QgsVectorLayer *> &layers );
/**
* A map of custom project variables.
* To get all available variables including generated ones
* use QgsExpressionContextUtils::projectScope() instead.
*/
QVariantMap customVariables() const;
/**
* A map of custom project variables.
* Be careful not to set generated variables.
*/
void setCustomVariables( const QVariantMap &customVariables );
/**
* Sets project's global labeling engine settings
* \since QGIS 3.0
*/
void setLabelingEngineSettings( const QgsLabelingEngineSettings &settings );
/**
* Returns project's global labeling engine settings
* \since QGIS 3.0
*/
const QgsLabelingEngineSettings &labelingEngineSettings() const;
//
// Functionality from QgsMapLayerRegistry
//
/**
* Returns a pointer to the project's internal layer store.
* /since QGIS 3.0
*/
QgsMapLayerStore *layerStore();
/**
* Returns a pointer to the project's internal layer store.
* /since QGIS 3.0
*/
SIP_SKIP const QgsMapLayerStore *layerStore() const;
//! Returns the number of registered layers.
int count() const;
/**
* Retrieve a pointer to a registered layer by layer ID.
* \param layerId ID of layer to retrieve
* \returns matching layer, or nullptr if no matching layer found
* \see mapLayersByName()
* \see mapLayers()
*/
QgsMapLayer *mapLayer( const QString &layerId ) const;
/**
* Retrieve a list of matching registered layers by layer name.
* \param layerName name of layers to match
* \returns list of matching layers
* \see mapLayer()
* \see mapLayers()
*/
QList<QgsMapLayer *> mapLayersByName( const QString &layerName ) const;
/**
* Returns a map of all registered layers by layer ID.
* \see mapLayer()
* \see mapLayersByName()
* \see layers()
*/
QMap<QString, QgsMapLayer *> mapLayers() const;
/**
* Returns true if the project comes from a zip archive, false otherwise.
*/
bool isZipped() const;
#ifndef SIP_RUN
/**
* Returns a list of registered map layers with a specified layer type.
*
* Example:
*
* QVector<QgsVectorLayer*> vectorLayers = QgsProject::instance()->layers<QgsVectorLayer*>();
*
* \note not available in Python bindings
* \see mapLayers()
* \since QGIS 2.16
*/
template <typename T>
QVector<T> layers() const
{
return mLayerStore->layers<T>();
}
#endif
/**
* \brief
* 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.
*
* \param mapLayers A list of layer which should be added to the registry
* \param 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
* \see addMapLayer()
* \since QGIS 1.8
*/
QList<QgsMapLayer *> addMapLayers( const QList<QgsMapLayer *> &mapLayers SIP_TRANSFER,
bool addToLegend = true,
bool takeOwnership SIP_PYARGREMOVE = true );
/**
* \brief
* 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.
*
* \param mapLayer A layer to add to the registry
* \param 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 nullptr if unable to add layer, otherwise pointer to newly added layer
*
* \see addMapLayers
*
* \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 addMapLayers()
*/
QgsMapLayer *addMapLayer( QgsMapLayer *mapLayer SIP_TRANSFER,
bool addToLegend = true,
bool takeOwnership SIP_PYARGREMOVE = true );
/**
* \brief
* 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.
*
* \param layerIds list of IDs of the layers to remove
*
* \note As a side-effect the QgsProject instance is marked dirty.
* \see removeMapLayer()
* \see removeAllMapLayers()
* \since QGIS 1.8
*/
void removeMapLayers( const QStringList &layerIds );
/**
* \brief
* Remove a set of layers from the registry.
*
* The specified layers will be removed from the registry. If the registry has ownership
* of any layers these layers will also be deleted.
*
* \param layers A list of layers to remove. Null pointers are ignored.
*
* \note As a side-effect the QgsProject instance is marked dirty.
* \see removeMapLayer()
* \see removeAllMapLayers()
*/
//TODO QGIS 3.0 - add PyName alias to avoid list type conversion error
void removeMapLayers( const QList<QgsMapLayer *> &layers );
/**
* \brief
* 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.
*
* \param layerId ID of the layer to remove
*
* \note As a side-effect the QgsProject instance is marked dirty.
* \see removeMapLayers()
* \see removeAllMapLayers()
*/
void removeMapLayer( const QString &layerId );
/**
* \brief
* 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.
*
* \param layer The layer to remove. Null pointers are ignored.
*
* \note As a side-effect the QgsProject instance is marked dirty.
* \see removeMapLayers()
* \see removeAllMapLayers()
*/
void removeMapLayer( QgsMapLayer *layer );
/**
* 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 removeMapLayer()
* \since QGIS 3.0
*/
QgsMapLayer *takeMapLayer( QgsMapLayer *layer ) SIP_TRANSFERBACK;
/**
* 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 removeMapLayer()
* \see removeMapLayers()
*/
void removeAllMapLayers();
/**
* Reload all registered layer's provider data caches, synchronising the layer
* with any changes in the datasource.
* \see QgsMapLayer::reload()
*/
void reloadAllLayers();
/**
* Returns the default CRS for new layers based on the settings and
* the current project CRS
*/
QgsCoordinateReferenceSystem defaultCrsForNewLayers() const;
/**
* 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.
*
* \param trust True to trust the project, false otherwise
*
* \since QGIS 3.0
*/
void setTrustLayerMetadata( bool trust );
/**
* 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.
*
* \since QGIS 3.0
*/
bool trustLayerMetadata() const { return mTrustLayerMetadata; }
/**
* Returns the current const auxiliary storage.
*
* \since QGIS 3.0
*/
const QgsAuxiliaryStorage *auxiliaryStorage() const SIP_SKIP;
/**
* Returns the current auxiliary storage.
*
* \since QGIS 3.0
*/
QgsAuxiliaryStorage *auxiliaryStorage();
/**
* Returns a reference to the project's metadata store.
* \see setMetadata()
* \see metadataChanged()
* \since QGIS 3.2
*/
const QgsProjectMetadata &metadata() const;
/**
* Sets the project's \a metadata store.
* \see metadata()
* \see metadataChanged()
* \since QGIS 3.2
*/
void setMetadata( const QgsProjectMetadata &metadata );
/**
* Returns a set of map layers that are required in the project and therefore they should not get
* removed from the project. The set of layers may be configured by users in project properties.
* and it is mainly a hint for the user interface to protect users from removing layers that important
* in the project. The removeMapLayer(), removeMapLayers() calls do not block removal of layers listed here.
* \since QGIS 3.2
*/
QSet<QgsMapLayer *> requiredLayers() const;
/**
* Configures a set of map layers that are required in the project and therefore they should not get
* removed from the project. The set of layers may be configured by users in project properties.
* and it is mainly a hint for the user interface to protect users from removing layers that important
* in the project. The removeMapLayer(), removeMapLayers() calls do not block removal of layers listed here.
* \since QGIS 3.2
*/
void setRequiredLayers( const QSet<QgsMapLayer *> &layers );
signals:
//! emitted when project is being read
void readProject( const QDomDocument & );
//! emitted when project is being written
void writeProject( QDomDocument & );
/**
* 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.
*
* \param mapLayer The map layer which is being initialized
* \param layerNode The layer node from the project file
*/
void readMapLayer( QgsMapLayer *mapLayer, const QDomElement &layerNode );
/**
* Emitted, when a layer is being saved. You can use this method to save
* additional information to the layer.
*
* \param mapLayer The map layer which is being initialized
* \param layerElem The layer element from the project file
* \param doc The document
*/
void writeMapLayer( QgsMapLayer *mapLayer, QDomElement &layerElem, QDomDocument &doc );
//! emitted when the project file has been written and closed
void projectSaved();
//! emitted when an old project file is read.
void oldProjectVersionWarning( const QString & );
/**
* Emitted when a layer from a projects was read.
* \param i current layer
* \param n number of layers
*/
void layerLoaded( int i, int n );
//! Emitted when a layer is loaded
void loadingLayer( const QString &layerName );