The QgsLayerTreeView class extends QTreeView and provides some additional functionality when working with a layer tree. More...

#include <qgslayertreeview.h>

Inheritance diagram for QgsLayerTreeView:

[legend]

Public Slots
void	collapseAllNodes ()
	Enhancement of QTreeView::collapseAll() that also records expanded state in layer tree nodes. More...

void	expandAllNodes ()
	Enhancement of QTreeView::expandAll() that also records expanded state in layer tree nodes. More...

void	refreshLayerSymbology (const QString &layerId)
	Force refresh of layer symbology. Normally not needed as the changes of layer's renderer are monitored by the model. More...

Signals
void	currentLayerChanged (QgsMapLayer *layer)
	Emitted when a current layer is changed. More...

Public Member Functions
	QgsLayerTreeView (QWidget *parent=nullptr)
	Constructor for QgsLayerTreeView. More...

	~QgsLayerTreeView () override

void	addIndicator (QgsLayerTreeNode node, QgsLayerTreeViewIndicator indicator)
	Adds an indicator to the given layer tree node. More...

QgsLayerTreeGroup *	currentGroupNode () const
	Gets current group node. If a layer is current node, the function will return parent group. May be null. More...

QgsMapLayer *	currentLayer () const
	Gets currently selected layer. May be null. More...

QgsLayerTreeModelLegendNode *	currentLegendNode () const
	Gets current legend node. More...

QgsLayerTreeNode *	currentNode () const
	Gets current node. May be null. More...

QgsLayerTreeViewDefaultActions *	defaultActions ()
	Gets access to the default actions that may be used with the tree view. More...

QList< QgsLayerTreeViewIndicator * >	indicators (QgsLayerTreeNode *node) const
	Returns list of indicators associated with a particular layer tree node. More...

QgsLayerTreeModel *	layerTreeModel () const
	Gets access to the model casted to QgsLayerTreeModel. More...

QgsLayerTreeViewMenuProvider *	menuProvider () const
	Returns pointer to the context menu provider. May be null. More...

void	removeIndicator (QgsLayerTreeNode node, QgsLayerTreeViewIndicator indicator)
	Removes a previously added indicator to a layer tree node. More...

QList< QgsLayerTreeLayer * >	selectedLayerNodes () const
	Returns list of selected nodes filtered to just layer nodes. More...

QList< QgsMapLayer * >	selectedLayers () const
	Gets list of selected layers. More...

QList< QgsMapLayer * >	selectedLayersRecursive () const
	Gets list of selected layers, including those that are not directly selected, but their ancestor groups is selected. More...

QList< QgsLayerTreeNode * >	selectedNodes (bool skipInternal=false) const
	Returns list of selected nodes. More...

void	setCurrentLayer (QgsMapLayer *layer)
	Sets currently selected layer. Null pointer will deselect any layer. More...

void	setMenuProvider (QgsLayerTreeViewMenuProvider *menuProvider)
	Sets provider for context menu. Takes ownership of the instance. More...

void	setModel (QAbstractItemModel *model) override
	Overridden setModel() from base class. Only QgsLayerTreeModel is an acceptable model. More...

Protected Slots
void	modelRowsInserted (const QModelIndex &index, int start, int end)

void	modelRowsRemoved ()

void	onCurrentChanged ()

void	onExpandedChanged (QgsLayerTreeNode *node, bool expanded)

void	onModelReset ()

void	updateExpandedStateToNode (const QModelIndex &index)

Protected Member Functions
void	contextMenuEvent (QContextMenuEvent *event) override

void	dropEvent (QDropEvent *event) override

void	keyPressEvent (QKeyEvent *event) override

QgsMapLayer *	layerForIndex (const QModelIndex &index) const

void	mouseReleaseEvent (QMouseEvent *event) override

void	updateExpandedStateFromNode (QgsLayerTreeNode *node)

Protected Attributes
QString	mCurrentLayerID
	Keeps track of current layer ID (to check when to emit signal about change of current layer) More...

QgsLayerTreeViewDefaultActions *	mDefaultActions = nullptr
	helper class with default actions. Lazily initialized. More...

QHash< QgsLayerTreeNode , QList< QgsLayerTreeViewIndicator > >	mIndicators
	Storage of indicators used with the tree view. More...

QPoint	mLastReleaseMousePos
	Used by the item delegate for identification of which indicator has been clicked. More...

QgsLayerTreeViewMenuProvider *	mMenuProvider = nullptr
	Context menu provider. Owned by the view. More...

Friends
class	QgsLayerTreeViewItemDelegate

Detailed Description

The QgsLayerTreeView class extends QTreeView and provides some additional functionality when working with a layer tree.

The view updates expanded state of layer tree nodes and also listens to changes to expanded states in the layer tree.

The view keeps track of the current layer and emits a signal when the current layer has changed.

Allows the client to specify a context menu provider with custom actions. Also it comes with a set of default actions that can be used when building context menu.

See also: QgsLayerTreeModel

Since: QGIS 2.4

Definition at line 49 of file qgslayertreeview.h.

Constructor & Destructor Documentation

QgsLayerTreeView::QgsLayerTreeView ( QWidget * parent = nullptr )

explicit

Constructor for QgsLayerTreeView.

Definition at line 34 of file qgslayertreeview.cpp.

QgsLayerTreeView::~QgsLayerTreeView ( )

override

Definition at line 60 of file qgslayertreeview.cpp.

Member Function Documentation

void QgsLayerTreeView::addIndicator	(	QgsLayerTreeNode *	node,
		QgsLayerTreeViewIndicator *	indicator
	)

Adds an indicator to the given layer tree node.

Indicators are icons shown next to layer/group names in the layer tree view. They can be used to show extra information with tree nodes and they allow user interaction.

Does not take ownership of the indicator. One indicator object may be used for multiple layer tree nodes.

See also: removeIndicator; indicators

Since: QGIS 3.2

Definition at line 370 of file qgslayertreeview.cpp.

void QgsLayerTreeView::collapseAllNodes ( )

slot

Enhancement of QTreeView::collapseAll() that also records expanded state in layer tree nodes.

Since: QGIS 2.18

Definition at line 439 of file qgslayertreeview.cpp.

void QgsLayerTreeView::contextMenuEvent ( QContextMenuEvent * event )

overrideprotected

Definition at line 124 of file qgslayertreeview.cpp.

QgsLayerTreeGroup * QgsLayerTreeView::currentGroupNode ( ) const

Gets current group node. If a layer is current node, the function will return parent group. May be null.

Definition at line 309 of file qgslayertreeview.cpp.

QgsMapLayer * QgsLayerTreeView::currentLayer ( ) const

Gets currently selected layer. May be null.

Definition at line 103 of file qgslayertreeview.cpp.

void QgsLayerTreeView::currentLayerChanged ( QgsMapLayer * layer )

signal

Emitted when a current layer is changed.

QgsLayerTreeModelLegendNode * QgsLayerTreeView::currentLegendNode ( ) const

Gets current legend node.

May be null if current node is not a legend node.

Since: QGIS 2.14

Definition at line 331 of file qgslayertreeview.cpp.

QgsLayerTreeNode * QgsLayerTreeView::currentNode ( ) const

Gets current node. May be null.

Definition at line 304 of file qgslayertreeview.cpp.

QgsLayerTreeViewDefaultActions * QgsLayerTreeView::defaultActions ( )

Gets access to the default actions that may be used with the tree view.

Definition at line 90 of file qgslayertreeview.cpp.

void QgsLayerTreeView::dropEvent ( QDropEvent * event )

overrideprotected

Definition at line 472 of file qgslayertreeview.cpp.

void QgsLayerTreeView::expandAllNodes ( )

slot

Enhancement of QTreeView::expandAll() that also records expanded state in layer tree nodes.

Since: QGIS 2.18

Definition at line 432 of file qgslayertreeview.cpp.

QList< QgsLayerTreeViewIndicator * > QgsLayerTreeView::indicators ( QgsLayerTreeNode * node ) const

Returns list of indicators associated with a particular layer tree node.

See also: addIndicator; removeIndicator

Since: QGIS 3.2

Definition at line 381 of file qgslayertreeview.cpp.

void QgsLayerTreeView::keyPressEvent ( QKeyEvent * event )

overrideprotected

Definition at line 461 of file qgslayertreeview.cpp.

QgsMapLayer * QgsLayerTreeView::layerForIndex ( const QModelIndex & index ) const

protected

Definition at line 282 of file qgslayertreeview.cpp.

QgsLayerTreeModel * QgsLayerTreeView::layerTreeModel ( ) const

Gets access to the model casted to QgsLayerTreeModel.

Definition at line 85 of file qgslayertreeview.cpp.

QgsLayerTreeViewMenuProvider* QgsLayerTreeView::menuProvider ( ) const

inline

Returns pointer to the context menu provider. May be null.

Definition at line 81 of file qgslayertreeview.h.

void QgsLayerTreeView::modelRowsInserted	(	const QModelIndex &	index,
		int	start,
		int	end
	)

protectedslot

Definition at line 140 of file qgslayertreeview.cpp.

void QgsLayerTreeView::modelRowsRemoved ( )

protectedslot

Definition at line 193 of file qgslayertreeview.cpp.

void QgsLayerTreeView::mouseReleaseEvent ( QMouseEvent * event )

overrideprotected

Definition at line 446 of file qgslayertreeview.cpp.

void QgsLayerTreeView::onCurrentChanged ( )

protectedslot

Definition at line 224 of file qgslayertreeview.cpp.

void QgsLayerTreeView::onExpandedChanged	(	QgsLayerTreeNode *	node,
		bool	expanded
	)

protectedslot

Definition at line 245 of file qgslayertreeview.cpp.

void QgsLayerTreeView::onModelReset ( )

protectedslot

Definition at line 268 of file qgslayertreeview.cpp.

void QgsLayerTreeView::refreshLayerSymbology ( const QString & layerId )

slot

Force refresh of layer symbology. Normally not needed as the changes of layer's renderer are monitored by the model.

Definition at line 393 of file qgslayertreeview.cpp.

void QgsLayerTreeView::removeIndicator	(	QgsLayerTreeNode *	node,
		QgsLayerTreeViewIndicator *	indicator
	)

Removes a previously added indicator to a layer tree node.

Does not delete the indicator.

See also: addIndicator; indicators

Since: QGIS 3.2

Definition at line 376 of file qgslayertreeview.cpp.

QList< QgsLayerTreeLayer * > QgsLayerTreeView::selectedLayerNodes ( ) const

Returns list of selected nodes filtered to just layer nodes.

Definition at line 341 of file qgslayertreeview.cpp.

QList< QgsMapLayer * > QgsLayerTreeView::selectedLayers ( ) const

Gets list of selected layers.

Definition at line 352 of file qgslayertreeview.cpp.

QList< QgsMapLayer * > QgsLayerTreeView::selectedLayersRecursive ( ) const

Gets list of selected layers, including those that are not directly selected, but their ancestor groups is selected.

If we have a group with two layers L1, L2 and just the group node is selected, this method returns L1 and L2, while selectedLayers() returns an empty list.

Since: QGIS 3.4

Definition at line 363 of file qgslayertreeview.cpp.

QList< QgsLayerTreeNode * > QgsLayerTreeView::selectedNodes ( bool skipInternal = false ) const

Returns list of selected nodes.

Parameters

skipInternal If true, will ignore nodes which have an ancestor in the selection

Definition at line 336 of file qgslayertreeview.cpp.

void QgsLayerTreeView::setCurrentLayer ( QgsMapLayer * layer )

Sets currently selected layer. Null pointer will deselect any layer.

Definition at line 108 of file qgslayertreeview.cpp.

void QgsLayerTreeView::setMenuProvider ( QgsLayerTreeViewMenuProvider * menuProvider )

Sets provider for context menu. Takes ownership of the instance.

Definition at line 97 of file qgslayertreeview.cpp.

void QgsLayerTreeView::setModel ( QAbstractItemModel * model )

override

Overridden setModel() from base class. Only QgsLayerTreeModel is an acceptable model.

Definition at line 65 of file qgslayertreeview.cpp.

void QgsLayerTreeView::updateExpandedStateFromNode ( QgsLayerTreeNode * node )

protected

Definition at line 273 of file qgslayertreeview.cpp.

void QgsLayerTreeView::updateExpandedStateToNode ( const QModelIndex & index )

protectedslot

Definition at line 199 of file qgslayertreeview.cpp.

Friends And Related Function Documentation

friend class QgsLayerTreeViewItemDelegate

friend

Definition at line 219 of file qgslayertreeview.h.

Member Data Documentation

QString QgsLayerTreeView::mCurrentLayerID

protected

Keeps track of current layer ID (to check when to emit signal about change of current layer)

Definition at line 212 of file qgslayertreeview.h.

QgsLayerTreeViewDefaultActions* QgsLayerTreeView::mDefaultActions = nullptr

protected

helper class with default actions. Lazily initialized.

Definition at line 208 of file qgslayertreeview.h.

QHash< QgsLayerTreeNode *, QList<QgsLayerTreeViewIndicator *> > QgsLayerTreeView::mIndicators

protected

Storage of indicators used with the tree view.

Definition at line 214 of file qgslayertreeview.h.

QPoint QgsLayerTreeView::mLastReleaseMousePos

protected

Used by the item delegate for identification of which indicator has been clicked.

Definition at line 216 of file qgslayertreeview.h.

QgsLayerTreeViewMenuProvider* QgsLayerTreeView::mMenuProvider = nullptr

protected

Context menu provider. Owned by the view.

Definition at line 210 of file qgslayertreeview.h.

The documentation for this class was generated from the following files:

/build/qgis-3.4.15+24xenial/src/gui/layertree/qgslayertreeview.h
/build/qgis-3.4.15+24xenial/src/gui/layertree/qgslayertreeview.cpp

Public Slots

Signals

Public Member Functions

Protected Slots

Protected Member Functions

Protected Attributes

Friends

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Friends And Related Function Documentation

Member Data Documentation