Class: QgsProjectViewSettings

class qgis.core.QgsProjectViewSettings(project: QgsProject = None)

Bases: PyQt5.QtCore.QObject

Constructor for QgsProjectViewSettings for the specified project.

Ownership is transferred to the project.

Contains settings and properties relating to how a QgsProject should be displayed inside map canvas, e.g. map scales and default view extent for the project.

New in version 3.10.1.

Parameters

project

childEvent(self, QChildEvent)
connectNotify(self, QMetaMethod)
customEvent(self, QEvent)
defaultViewExtent(self)QgsReferencedRectangle

Returns the default view extent, which should be used as the initial map extent when this project is opened.

Warning

When a project is opened in the QGIS desktop application and saved, individual map canvases will store their own previous view extent as custom project properties. Reloading this saved version of the project will trigger the canvases to restore their individual last view extents. Accordingly, in the QGIS desktop application, this setting only forms a default, initial view used when the project is opened for the very first time.

Return type

QgsReferencedRectangle

disconnectNotify(self, QMetaMethod)
fullExtent(self)QgsReferencedRectangle

Returns the full extent of the project, which represents the maximal limits of the project.

The returned extent will be in the project’s CRS.

If the presetFullExtent() is non null, this will be returned as the full extent. Otherwise the full extent will be calculated based on the extent of all layers in the project.

Return type

QgsReferencedRectangle

isSignalConnected(self, QMetaMethod) → bool
mapScales(self) → List[float]

Returns the list of custom project map scales.

The scales list consists of a list of scale denominator values, e.g. 1000 for a 1:1000 scale.

See also

setMapScales()

Return type

List[float]

mapScalesChanged

Emitted when the list of custom project map scales changes.

See also

mapScales()

See also

setMapScales() [signal]

presetFullExtent(self)QgsReferencedRectangle

Returns the project’s preset full extent.

This extent represents the maximal limits of the project. The full extent defaults to a null rectangle, which indicates that the maximal extent should be calculated based on the layers in the project.

See also

fullExtent()

New in version 3.18.

Return type

QgsReferencedRectangle

presetFullExtentChanged

Emitted whenever the presetFullExtent() is changed.

New in version 3.18: [signal]

readXml(self, element: QDomElement, context: QgsReadWriteContext) → bool

Reads the settings’s state from a DOM element.

See also

writeXml()

Parameters
Return type

bool

receivers(self, PYQT_SIGNAL) → int
reset(self)

Resets the settings to a default state.

sender(self) → QObject
senderSignalIndex(self) → int
setDefaultViewExtent(self, extent: QgsReferencedRectangle)

Sets the default view extent, which should be used as the initial map extent when this project is opened.

Warning

When a project is opened in the QGIS desktop application and saved, individual map canvases will store their own previous view extent as custom project properties. Reloading this saved version of the project will trigger the canvases to restore their individual last view extents. Accordingly, in the QGIS desktop application, this setting only forms a default, initial view used when the project is opened for the very first time.

Parameters

extent (QgsReferencedRectangle) –

setMapScales(self, scales: Iterable[float])

Sets the list of custom project map scales.

The scales list consists of a list of scale denominator values, e.g. 1000 for a 1:1000 scale.

See also

mapScales()

Parameters

scales (Iterable[float]) –

setPresetFullExtent(self, extent: QgsReferencedRectangle)

Sets the project’s preset full extent.

This extent represents the maximal limits of the project. Setting the full extent to a null rectangle indicates that the maximal extent should be calculated based on the layers in the project.

See also

fullExtent()

New in version 3.18.

Parameters

extent (QgsReferencedRectangle) –

setUseProjectScales(self, enabled: bool)

Sets whether project mapScales() are enabled.

When project map scales are enabled these scales will replace the default QGIS map scales list while working with this project.

See also

setMapScales()

Parameters

enabled (bool) –

timerEvent(self, QTimerEvent)
useProjectScales(self) → bool

Returns True if project mapScales() are enabled.

When project map scales are enabled these scales will replace the default QGIS map scales list while working with this project.

See also

mapScales()

Return type

bool

writeXml(self, doc: QDomDocument, context: QgsReadWriteContext) → QDomElement

Returns a DOM element representing the settings.

See also

readXml()

Parameters
Return type

QDomElement