mirror of
https://github.com/qgis/QGIS.git
synced 2025-02-26 00:02:08 -05:00
f6f5010131
This change consolidates more unit handling and conversion into QgsUnitTypes. Additionally, UnknownUnit was renamed to UnknownDistanceUnit. All methods which accepted QGis::UnitType parameters have been updated to take QgsUnitTypes::DistanceUnit instead. ALso remove the unit handling methods toLiteral, fromLiteral, tr, fromTr, and fromUnitToUnitFactor from QGis. Their corresponding counterparts in QgsUnitTypes should be used instead.
454 lines
16 KiB
Plaintext
454 lines
16 KiB
Plaintext
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/** \ingroup core
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* Reads and writes project states.
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@note
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Has two general kinds of state to make persistent. (I.e., to read and
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write.) First, QGIS proprietary information. Second plug-in information.
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A singleton since there shall only be one active project at a time; and
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provides canonical location for plug-ins and main app to find/set
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properties.
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*/
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class QgsProject : QObject
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{
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%TypeHeaderCode
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#include <qgsproject.h>
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%End
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public:
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// TODO XXX Should have semantics for saving project if dirty as last gasp?
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~QgsProject();
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//! Returns the QgsProject singleton instance
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static QgsProject * instance();
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/**
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* Every project has an associated title string
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*
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* @deprecated Use setTitle instead.
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*/
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void title( const QString & title ) /Deprecated/;
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/** Sets the project's title.
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* @param title new title
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* @note added in 2.4
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* @see title()
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*/
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void setTitle( const QString& title );
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/** Returns the project's title.
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* @see setTitle()
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*/
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QString title() const;
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/**
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* Returns true if the project has been modified since the last write()
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*/
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bool isDirty() const;
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/**
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* Flag the project as dirty (modified). If this flag is set, the user will
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* be asked to save changes to the project before closing the current project.
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*
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* @deprecated use setDirty instead
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*/
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void dirty( bool b ) /Deprecated/;
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/** Sets the file name associated with the project. This is the file which contains the project's XML
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* representation.
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* @param name project file name
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* @see fileName()
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*/
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void setFileName( const QString& name );
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/** Returns the project's file name. This is the file which contains the project's XML
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* representation.
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* @see setFileName()
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* @see fileInfo()
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*/
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QString fileName() const;
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/** Returns QFileInfo object for the project's associated file.
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* @see fileName()
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* @note added in QGIS 2.9
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*/
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QFileInfo fileInfo() const;
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/** Clear the project - removes all settings and resets it back to an empty, default state.
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* @note added in 2.4
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*/
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void clear();
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/** Reads a project file.
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* @param file name of project file to read
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* @note Any current plug-in state is erased
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* @note Calling read() performs the following operations:
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*
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* - Gets the extents
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* - Creates maplayers
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* - Registers maplayers
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*
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* @note it's presumed that the caller has already reset the map canvas, map registry, and legend
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*/
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bool read( const QFileInfo& file );
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/** Reads the current project file.
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* @note Any current plug-in state is erased
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* @note Calling read() performs the following operations:
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*
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* - Gets the extents
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* - Creates maplayers
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* - Registers maplayers
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*
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* @note it's presumed that the caller has already reset the map canvas, map registry, and legend
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*/
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bool read();
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/** Reads the layer described in the associated DOM node.
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*
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* @param layerNode represents a QgsProject DOM node that encodes a specific layer.
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*
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* QgsProject raises an exception when one of the QgsProject::read()
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* implementations fails. Since the read()s are invoked from qgisapp,
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* then qgisapp handles the exception. It prompts the user for the new
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* location of the data, if any. If there is a new location, the DOM
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* node associated with the layer has its datasource tag corrected.
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* Then that node is passed to this member function to be re-opened.
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*
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*/
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bool read( QDomNode& layerNode );
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/** Writes the project to a file.
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* @param file destination file
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* @note calling this implicitly sets the project's filename (see setFileName() )
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* @note isDirty() will be set to false if project is successfully written
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* @returns true if project was written successfully
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*/
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bool write( const QFileInfo& file );
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/** Writes the project to its current associated file (see fileName() ).
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* @note isDirty() will be set to false if project is successfully written
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* @returns true if project was written successfully
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*/
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bool write();
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/**
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* Removes all project properties.
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*
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* @deprecated use clear() instead
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*/
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void clearProperties() /Deprecated/;
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/* key value mutators
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*
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* keys would be the familiar QSettings-like '/' delimited entries, implying
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* a hierarchy of keys and corresponding values
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*
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* @note The key string must be valid xml tag names in order to be saved to the file.
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*/
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//! @note available in python bindings as writeEntryBool
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bool writeEntry( const QString & scope, const QString & key, bool value ) /PyName=writeEntryBool/;
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//! @note available in python bindings as writeEntryDouble
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bool writeEntry( const QString & scope, const QString & key, double value ) /PyName=writeEntryDouble/;
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bool writeEntry( const QString & scope, const QString & key, int value );
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bool writeEntry( const QString & scope, const QString & key, const QString & value );
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bool writeEntry( const QString & scope, const QString & key, const QStringList & value );
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/** Key value accessors
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*
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* keys would be the familiar QSettings-like '/' delimited entries,
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* implying a hierarchy of keys and corresponding values
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*
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*/
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QStringList readListEntry( const QString & scope, const QString & key, const QStringList& def = QStringList(), bool *ok = 0 ) const;
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QString readEntry( const QString & scope, const QString & key, const QString & def = QString::null, bool * ok = 0 ) const;
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int readNumEntry( const QString & scope, const QString & key, int def = 0, bool * ok = 0 ) const;
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double readDoubleEntry( const QString & scope, const QString & key, double def = 0, bool * ok = 0 ) const;
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bool readBoolEntry( const QString & scope, const QString & key, bool def = false, bool * ok = 0 ) const;
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/** Remove the given key */
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bool removeEntry( const QString & scope, const QString & key );
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/** Return keys with values -- do not return keys that contain other keys
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*
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* @note equivalent to QSettings entryList()
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*/
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QStringList entryList( const QString & scope, const QString & key ) const;
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/** Return keys with keys -- do not return keys that contain only values
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*
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* @note equivalent to QSettings subkeyList()
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*/
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QStringList subkeyList( const QString & scope, const QString & key ) const;
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/** Dump out current project properties to stderr
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*
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* @todo XXX Now slightly broken since re-factoring. Won't print out top-level key
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* and redundantly prints sub-keys.
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*/
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void dumpProperties() const;
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/** Prepare a filename to save it to the project file */
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QString writePath( const QString& filename, const QString& relativeBasePath = QString::null ) const;
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/** Turn filename read from the project file to an absolute path */
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QString readPath( QString filename ) const;
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/** Return error message from previous read/write */
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QString error() const;
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/** Change handler for missing layers.
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* Deletes old handler and takes ownership of the new one.
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*/
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void setBadLayerHandler( QgsProjectBadLayerHandler* handler /Transfer/ );
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/** Returns project file path if layer is embedded from other project file. Returns empty string if layer is not embedded*/
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QString layerIsEmbedded( const QString& id ) const;
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/** Creates a maplayer instance defined in an arbitrary project file. Caller takes ownership
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* @return the layer or 0 in case of error
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* @note not available in Python bindings
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*/
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/*
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bool createEmbeddedLayer( const QString& layerId, const QString& projectFilePath, QList<QDomNode>& brokenNodes,
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QList< QPair< QgsVectorLayer*, QDomElement > >& vectorLayerList, bool saveFlag = true );
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*/
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/** Create layer group instance defined in an arbitrary project file.
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* @note: added in version 2.4
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*/
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QgsLayerTreeGroup* createEmbeddedGroup( const QString& groupName, const QString& projectFilePath, const QStringList &invisibleLayers );
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/** Convenience function to set snap settings per layer */
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void setSnapSettingsForLayer( const QString& layerId, bool enabled, QgsSnapper::SnappingType type, QgsTolerance::UnitType unit, double tolerance,
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bool avoidIntersection );
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/** Convenience function to query snap settings of a layer */
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bool snapSettingsForLayer( const QString& layerId, bool& enabled /Out/, QgsSnapper::SnappingType& type /Out/, QgsTolerance::UnitType& units /Out/, double& tolerance /Out/,
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bool& avoidIntersection /Out/ ) const;
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/** Convenience function to set topological editing */
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void setTopologicalEditing( bool enabled );
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/** Convenience function to query topological editing status */
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bool topologicalEditing() const;
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/** Convenience function to query default distance measurement units for project.
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* @note added in QGIS 2.14
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* @see areaUnits()
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*/
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QgsUnitTypes::DistanceUnit distanceUnits() const;
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/** Convenience function to query default area measurement units for project.
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* @note added in QGIS 2.14
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* @see distanceUnits()
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*/
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QgsUnitTypes::AreaUnit areaUnits() const;
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/** Return project's home path
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@return home path of project (or QString::null if not set) */
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QString homePath() const;
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QgsRelationManager* relationManager() const;
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/** Return pointer to the root (invisible) node of the project's layer tree
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* @note added in 2.4
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*/
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QgsLayerTreeGroup* layerTreeRoot() const;
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/** Return pointer to the helper class that synchronizes map layer registry with layer tree
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* @note added in 2.4
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*/
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QgsLayerTreeRegistryBridge* layerTreeRegistryBridge() const;
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/** Returns pointer to the project's visibility preset collection.
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* @note added in QGIS 2.12
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*/
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QgsVisibilityPresetCollection* visibilityPresetCollection();
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/**
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* Set a list of layers which should not be taken into account on map identification
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*/
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void setNonIdentifiableLayers( QList<QgsMapLayer*> layers );
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/**
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* Set a list of layers which should not be taken into account on map identification
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*/
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void setNonIdentifiableLayers( const QStringList& layerIds );
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/**
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* Get the list of layers which currently should not be taken into account on map identification
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*/
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QStringList nonIdentifiableLayers() const;
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/**
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* Transactional editing means that on supported datasources (postgres databases) the edit state of
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* all tables that originate from the same database are synchronized and executed in a server side
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* transaction.
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*
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* @note Added in QGIS 2.16
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*/
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bool autoTransaction() const;
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/**
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* Transactional editing means that on supported datasources (postgres databases) the edit state of
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* all tables that originate from the same database are synchronized and executed in a server side
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* transaction.
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*
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* Make sure that this is only called when all layers are not in edit mode.
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*
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* @note Added in QGIS 2.16
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*/
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void setAutoTransaction(bool autoTransaction );
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/**
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* Should default values be evaluated on provider side when requested and not when committed.
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*
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* @note added in 2.16
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*/
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bool evaluateDefaultValues() const;
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/**
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* Defines if default values should be evaluated on provider side when requested and not when committed.
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*
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* @note added in 2.16
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*/
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void setEvaluateDefaultValues( bool evaluateDefaultValues );
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protected:
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/** Set error message from read/write operation
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* @note not available in Python bindings
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*/
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//void setError( const QString& errorMessage );
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/** Clear error message
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* @note not available in Python bindings
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*/
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//void clearError();
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//! Creates layer and adds it to maplayer registry
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//! @note not available in python bindings
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// bool addLayer( const QDomElement& layerElem, QList<QDomNode>& brokenNodes, QList< QPair< QgsVectorLayer*, QDomElement > >& vectorLayerList );
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//! @note not available in python bindings
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// void initializeEmbeddedSubtree( const QString& projectFilePath, QgsLayerTreeGroup* group );
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//! @note not available in python bindings
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// void loadEmbeddedNodes( QgsLayerTreeGroup* group );
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signals:
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//! emitted when project is being read
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void readProject( const QDomDocument & );
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//! emitted when project is being written
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void writeProject( QDomDocument & );
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/**
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* Emitted, after the basic initialization of a layer from the project
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* file is done. You can use this signal to read additional information
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* from the project file.
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*
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* @param mapLayer The map layer which is being initialized
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* @param layerNode The layer node from the project file
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*/
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void readMapLayer( QgsMapLayer *mapLayer, const QDomElement &layerNode );
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/**
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* Emitted, when a layer is being saved. You can use this method to save
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* additional information to the layer.
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*
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* @param mapLayer The map layer which is being initialized
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* @param layerElem The layer element from the project file
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* @param doc The document
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*/
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void writeMapLayer( QgsMapLayer *mapLayer, QDomElement &layerElem, QDomDocument &doc );
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//! emitted when the project file has been written and closed
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void projectSaved();
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//! emitted when an old project file is read.
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void oldProjectVersionWarning( const QString& );
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//! emitted when a layer from a projects was read
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// @param i current layer
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// @param n number of layers
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void layerLoaded( int i, int n );
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void loadingLayer( const QString& );
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void snapSettingsChanged();
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//! Emitted when the list of layer which are excluded from map identification changes
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void nonIdentifiableLayersChanged( QStringList nonIdentifiableLayers );
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//! Emitted when the file name of the project changes
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void fileNameChanged();
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//! Emitted when the home path of the project changes
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void homePathChanged();
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/** Emitted whenever the expression variables stored in the project have been changed.
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* @note added in QGIS 3.0
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*/
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void variablesChanged();
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public slots:
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/**
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* Flag the project as dirty (modified). If this flag is set, the user will
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* be asked to save changes to the project before closing the current project.
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*
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* @note added in 2.4
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* @note promoted to public slot in 2.16
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*/
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void setDirty( bool b = true );
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/** Causes the project to emit the variablesChanged() signal. This should
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* be called whenever expression variables related to the project are changed.
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* @see variablesChanged()
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* @note added in QGIS 3.0
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*/
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void emitVariablesChanged();
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private:
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QgsProject(); // private 'cause it's a singleton
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}; // QgsProject
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/** Interface for classes that handle missing layer files when reading project file. */
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class QgsProjectBadLayerHandler
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{
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%TypeHeaderCode
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#include <qgsproject.h>
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%End
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public:
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virtual void handleBadLayers( const QList<QDomNode>& layers, const QDomDocument& projectDom ) = 0;
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virtual ~QgsProjectBadLayerHandler();
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};
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/** Default bad layer handler which ignores any missing layers. */
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class QgsProjectBadLayerDefaultHandler : QgsProjectBadLayerHandler
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{
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%TypeHeaderCode
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#include <qgsproject.h>
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%End
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public:
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virtual void handleBadLayers( const QList<QDomNode>& layers, const QDomDocument& projectDom );
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};
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