Class: QgsLayerTreeGroup¶
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class
qgis.core.
QgsLayerTreeGroup
(name: str = '', checked: bool = True)¶ Bases:
qgis._core.QgsLayerTreeNode
Constructor
Layer tree group node serves as a container for layers and further groups.
Group names do not need to be unique within one tree nor within one parent.
New in version 2.4: Enums
Methods
Append an existing node.
Append a new group node with given name.
Append a new layer node for given map layer.
Returns a clone of the group.
Returns text representation of the tree.
Find group node with specified name.
Find all group layer nodes
Find layer node representing the map layer.
Find layer IDs used in all layer nodes.
Find all layer nodes.
Insert existing node at specified position.
Insert existing nodes at specified position.
Insert a new group node with given name at specified position.
Insert a new layer node for given map layer at specified position.
Returns whether the group is mutually exclusive (only one child can be checked at a time)
Returns the group’s name.
Read children from XML and append them to the group.
Read group (tree) from XML element <layer-tree-group> and return the newly created group (or null on error).
Remove all child nodes.
Remove a child node from this group.
Remove child nodes from index “from”.
Remove all child group nodes without layers.
Remove map layer’s node from this group.
Calls resolveReferences() on child tree nodes
Set whether the group is mutually exclusive (only one child can be checked at a time).
Check or uncheck a node and all its children (taking into account exclusion rules)
Sets the group’s name.
Set check state of children - if mutually exclusive
Write group (tree) as XML element <layer-tree-group> and add it to the given parent element
Signals
Attributes
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addChildNode
(self, node: QgsLayerTreeNode)¶ Append an existing node. The node must not have a parent yet. The node will be owned by this group.
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addGroup
(self, name: str) → QgsLayerTreeGroup¶ Append a new group node with given name. Newly created node is owned by this group.
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addLayer
(self, layer: QgsMapLayer) → QgsLayerTreeLayer¶ Append a new layer node for given map layer. The newly created node is owned by this group.
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childEvent
()¶
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clone
(self) → QgsLayerTreeGroup¶ Returns a clone of the group. The children are cloned too.
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connectNotify
()¶
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customEvent
()¶
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disconnectNotify
()¶
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dump
(self) → str¶ Returns text representation of the tree. For debugging purposes only.
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findGroup
(self, name: str) → QgsLayerTreeGroup¶ Find group node with specified name. Searches recursively the whole sub-tree.
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findGroups
(self) → object¶ Find all group layer nodes
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findLayer
(self, layer: QgsMapLayer) → QgsLayerTreeLayer¶ Find layer node representing the map layer. Searches recursively the whole sub-tree.
New in version 3.0.
findLayer(self, layerId: str) -> QgsLayerTreeLayer Find layer node representing the map layer specified by its ID. Searches recursively the whole sub-tree.
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findLayerIds
(self) → List[str]¶ Find layer IDs used in all layer nodes. Searches recursively the whole sub-tree.
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findLayers
(self) → List[QgsLayerTreeLayer]¶ Find all layer nodes. Searches recursively the whole sub-tree.
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insertChildNode
(self, index: int, node: QgsLayerTreeNode)¶ Insert existing node at specified position. The node must not have a parent yet. The node will be owned by this group.
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insertChildNodes
(self, index: int, nodes: Iterable[QgsLayerTreeNode])¶ Insert existing nodes at specified position. The nodes must not have a parent yet. The nodes will be owned by this group.
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insertChildrenPrivate
()¶
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insertGroup
(self, index: int, name: str) → QgsLayerTreeGroup¶ Insert a new group node with given name at specified position. The newly created node is owned by this group.
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insertLayer
(self, index: int, layer: QgsMapLayer) → QgsLayerTreeLayer¶ Insert a new layer node for given map layer at specified position. The newly created node is owned by this group.
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isMutuallyExclusive
(self) → bool¶ Returns whether the group is mutually exclusive (only one child can be checked at a time)
New in version 2.12.
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isSignalConnected
()¶
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name
(self) → str¶ Returns the group’s name.
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nodeVisibilityChanged
(self, node: QgsLayerTreeNode)¶
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readChildrenFromXml
(self, element: QDomElement, context: QgsReadWriteContext)¶ Read children from XML and append them to the group. Does not resolve textual references to layers. Call resolveReferences() afterwards to do it.
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readCommonXml
()¶
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readXml
(element: QDomElement, context: QgsReadWriteContext) → QgsLayerTreeGroup¶ Read group (tree) from XML element <layer-tree-group> and return the newly created group (or null on error). Does not resolve textual references to layers. Call resolveReferences() afterwards to do it.
readXml(element: QDomElement, project: QgsProject, context: QgsReadWriteContext) -> QgsLayerTreeGroup Read group (tree) from XML element <layer-tree-group> and return the newly created group (or null on error). Also resolves textual references to layers from the project (calls resolveReferences() internally).
New in version 3.0.
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receivers
()¶
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removeAllChildren
(self)¶ Remove all child nodes. The nodes will be deleted.
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removeChildNode
(self, node: QgsLayerTreeNode)¶ Remove a child node from this group. The node will be deleted.
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removeChildren
(self, from_: int, count: int)¶ Remove child nodes from index “from”. The nodes will be deleted.
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removeChildrenGroupWithoutLayers
(self)¶ Remove all child group nodes without layers. The groupnodes will be deleted.
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removeChildrenPrivate
()¶
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removeLayer
(self, layer: QgsMapLayer)¶ Remove map layer’s node from this group. The node will be deleted.
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resolveReferences
(self, project: QgsProject, looseMatching: bool = False)¶ Calls resolveReferences() on child tree nodes
New in version 3.0.
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sender
()¶
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senderSignalIndex
()¶
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setIsMutuallyExclusive
(self, enabled: bool, initialChildIndex: int = -1)¶ Set whether the group is mutually exclusive (only one child can be checked at a time). The initial child index determines which child should be initially checked. The default value of -1 will determine automatically (either first one currently checked or none)
New in version 2.12.
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setItemVisibilityCheckedRecursive
(self, checked: bool)¶ Check or uncheck a node and all its children (taking into account exclusion rules)
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setName
(self, n: str)¶ Sets the group’s name.
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timerEvent
()¶
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updateChildVisibilityMutuallyExclusive
(self)¶ Set check state of children - if mutually exclusive
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writeCommonXml
()¶
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writeXml
(self, parentElement: QDomElement, context: QgsReadWriteContext)¶ Write group (tree) as XML element <layer-tree-group> and add it to the given parent element
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