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qgslayertreemodel.cpp
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qgslayertreemodel.cpp
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/***************************************************************************
qgslayertreemodel.cpp
--------------------------------------
Date : May 2014
Copyright : (C) 2014 by Martin Dobias
Email : wonder dot sk at gmail dot 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. *
* *
***************************************************************************/
#include "qgslayertreemodel.h"
#include "qgslayertree.h"
#include "qgslayertreeutils.h"
#include "qgslayertreemodellegendnode.h"
#include <QMimeData>
#include <QTextStream>
#include "qgsdataitem.h"
#include "qgsmaphittest.h"
#include "qgsmaplayerlegend.h"
#include "qgsmaplayerstylemanager.h"
#include "qgspluginlayer.h"
#include "qgsrasterlayer.h"
#include "qgsrendererv2.h"
#include "qgssymbollayerv2utils.h"
#include "qgsvectorlayer.h"
QgsLayerTreeModel::QgsLayerTreeModel( QgsLayerTreeGroup* rootNode, QObject *parent )
: QAbstractItemModel( parent )
, mRootNode( rootNode )
, mFlags( ShowLegend | AllowLegendChangeState | DeferredLegendInvalidation )
, mAutoCollapseLegendNodesCount( -1 )
, mLegendFilterByScale( 0 )
, mLegendMapViewMupp( 0 )
, mLegendMapViewDpi( 0 )
, mLegendMapViewScale( 0 )
{
connectToRootNode();
mFontLayer.setBold( true );
connect( &mDeferLegendInvalidationTimer, SIGNAL( timeout() ), this, SLOT( invalidateLegendMapBasedData() ) );
mDeferLegendInvalidationTimer.setSingleShot( true );
}
QgsLayerTreeModel::~QgsLayerTreeModel()
{
legendCleanup();
}
QgsLayerTreeNode* QgsLayerTreeModel::index2node( const QModelIndex& index ) const
{
if ( !index.isValid() )
return mRootNode;
QObject* obj = reinterpret_cast<QObject*>( index.internalPointer() );
return qobject_cast<QgsLayerTreeNode*>( obj );
}
int QgsLayerTreeModel::rowCount( const QModelIndex &parent ) const
{
if ( QgsLayerTreeModelLegendNode* nodeLegend = index2legendNode( parent ) )
return legendNodeRowCount( nodeLegend );
QgsLayerTreeNode* n = index2node( parent );
if ( !n )
return 0;
if ( QgsLayerTree::isLayer( n ) )
{
if ( !testFlag( ShowLegend ) )
return 0;
return legendRootRowCount( QgsLayerTree::toLayer( n ) );
}
return n->children().count();
}
int QgsLayerTreeModel::columnCount( const QModelIndex &parent ) const
{
Q_UNUSED( parent );
return 1;
}
QModelIndex QgsLayerTreeModel::index( int row, int column, const QModelIndex &parent ) const
{
if ( column < 0 || column >= columnCount( parent ) ||
row < 0 || row >= rowCount( parent ) )
return QModelIndex();
if ( QgsLayerTreeModelLegendNode* nodeLegend = index2legendNode( parent ) )
return legendNodeIndex( row, column, nodeLegend );
QgsLayerTreeNode *n = index2node( parent );
if ( !n )
return QModelIndex(); // have no children
if ( testFlag( ShowLegend ) && QgsLayerTree::isLayer( n ) )
{
return legendRootIndex( row, column, QgsLayerTree::toLayer( n ) );
}
return createIndex( row, column, static_cast<QObject*>( n->children().at( row ) ) );
}
QModelIndex QgsLayerTreeModel::parent( const QModelIndex &child ) const
{
if ( !child.isValid() )
return QModelIndex();
if ( QgsLayerTreeNode *n = index2node( child ) )
{
return indexOfParentLayerTreeNode( n->parent() ); // must not be null
}
else if ( QgsLayerTreeModelLegendNode* legendNode = index2legendNode( child ) )
{
return legendParent( legendNode );
}
else
{
Q_ASSERT( false ); // no other node types!
return QModelIndex();
}
}
QModelIndex QgsLayerTreeModel::indexOfParentLayerTreeNode( QgsLayerTreeNode* parentNode ) const
{
Q_ASSERT( parentNode );
QgsLayerTreeNode* grandParentNode = parentNode->parent();
if ( !grandParentNode )
return QModelIndex(); // root node -> invalid index
int row = grandParentNode->children().indexOf( parentNode );
Q_ASSERT( row >= 0 );
return createIndex( row, 0, static_cast<QObject*>( parentNode ) );
}
QVariant QgsLayerTreeModel::data( const QModelIndex &index, int role ) const
{
if ( !index.isValid() || index.column() > 1 )
return QVariant();
if ( QgsLayerTreeModelLegendNode* sym = index2legendNode( index ) )
return legendNodeData( sym, role );
QgsLayerTreeNode* node = index2node( index );
if ( role == Qt::DisplayRole || role == Qt::EditRole )
{
if ( QgsLayerTree::isGroup( node ) )
return QgsLayerTree::toGroup( node )->name();
if ( QgsLayerTree::isLayer( node ) )
{
QgsLayerTreeLayer* nodeLayer = QgsLayerTree::toLayer( node );
QString name = nodeLayer->layerName();
if ( nodeLayer->customProperty( "showFeatureCount", 0 ).toInt() && role == Qt::DisplayRole )
{
QgsVectorLayer* vlayer = qobject_cast<QgsVectorLayer*>( nodeLayer->layer() );
if ( vlayer && vlayer->featureCount() >= 0 )
name += QString( " [%1]" ).arg( vlayer->featureCount() );
}
return name;
}
}
else if ( role == Qt::DecorationRole && index.column() == 0 )
{
if ( QgsLayerTree::isGroup( node ) )
return iconGroup();
if ( QgsLayerTree::isLayer( node ) )
{
QgsLayerTreeLayer *nodeLayer = QgsLayerTree::toLayer( node );
QgsMapLayer *layer = nodeLayer->layer();
if ( !layer )
return QVariant();
// icons possibly overriding default icon
if ( layer->type() == QgsMapLayer::RasterLayer )
{
if ( testFlag( ShowRasterPreviewIcon ) )
{
QgsRasterLayer* rlayer = qobject_cast<QgsRasterLayer *>( layer );
return QIcon( QPixmap::fromImage( rlayer->previewAsImage( QSize( 32, 32 ) ) ) );
}
else
{
return QgsLayerItem::iconRaster();
}
}
QgsVectorLayer *vlayer = dynamic_cast<QgsVectorLayer*>( layer );
QIcon icon;
// if there's just on legend entry that should be embedded in layer - do that!
if ( testFlag( ShowLegend ) && legendEmbeddedInParent( nodeLayer ) )
{
icon = legendIconEmbeddedInParent( nodeLayer );
}
else if ( vlayer && layer->type() == QgsMapLayer::VectorLayer )
{
if ( vlayer->geometryType() == QGis::Point )
icon = QgsLayerItem::iconPoint();
else if ( vlayer->geometryType() == QGis::Line )
icon = QgsLayerItem::iconLine();
else if ( vlayer->geometryType() == QGis::Polygon )
icon = QgsLayerItem::iconPolygon();
else if ( vlayer->geometryType() == QGis::NoGeometry )
icon = QgsLayerItem::iconTable();
else
icon = QgsLayerItem::iconDefault();
}
if ( vlayer && vlayer->isEditable() )
{
QPixmap pixmap( icon.pixmap( 16, 16 ) );
QPainter painter( &pixmap );
painter.drawPixmap( 0, 0, 16, 16, QgsApplication::getThemePixmap( vlayer->isModified() ? "/mIconEditableEdits.png" : "/mIconEditable.png" ) );
painter.end();
icon = QIcon( pixmap );
}
return icon;
}
}
else if ( role == Qt::CheckStateRole )
{
if ( !testFlag( AllowNodeChangeVisibility ) )
return QVariant();
if ( QgsLayerTree::isLayer( node ) )
{
QgsLayerTreeLayer* nodeLayer = QgsLayerTree::toLayer( node );
if ( nodeLayer->layer() && nodeLayer->layer()->type() == QgsMapLayer::VectorLayer )
{
if ( qobject_cast<QgsVectorLayer*>( nodeLayer->layer() )->geometryType() == QGis::NoGeometry )
return QVariant(); // do not show checkbox for non-spatial tables
}
return nodeLayer->isVisible();
}
else if ( QgsLayerTree::isGroup( node ) )
{
QgsLayerTreeGroup* nodeGroup = QgsLayerTree::toGroup( node );
return nodeGroup->isVisible();
}
}
else if ( role == Qt::FontRole )
{
QFont f( QgsLayerTree::isLayer( node ) ? mFontLayer : ( QgsLayerTree::isGroup( node ) ? mFontGroup : QFont() ) );
if ( node->customProperty( "embedded" ).toInt() )
f.setItalic( true );
if ( index == mCurrentIndex )
f.setUnderline( true );
return f;
}
else if ( role == Qt::ToolTipRole )
{
if ( QgsLayerTree::isLayer( node ) )
{
if ( QgsMapLayer* layer = QgsLayerTree::toLayer( node )->layer() )
{
QString tooltip = "<b>" +
( layer->title().isEmpty() ? layer->shortName() : layer->title() ) + "</b>";
if ( !layer->abstract().isEmpty() )
tooltip += "<br/>" + layer->abstract().replace( "\n", "<br/>" );
tooltip += "<br/><i>" + layer->publicSource() + "</i>";
return tooltip;
}
}
}
return QVariant();
}
Qt::ItemFlags QgsLayerTreeModel::flags( const QModelIndex& index ) const
{
if ( !index.isValid() )
{
Qt::ItemFlags rootFlags = nullptr;
if ( testFlag( AllowNodeReorder ) )
rootFlags |= Qt::ItemIsDropEnabled;
return rootFlags;
}
if ( QgsLayerTreeModelLegendNode* symn = index2legendNode( index ) )
return legendNodeFlags( symn );
Qt::ItemFlags f = Qt::ItemIsEnabled | Qt::ItemIsSelectable;
if ( testFlag( AllowNodeRename ) )
f |= Qt::ItemIsEditable;
QgsLayerTreeNode* node = index2node( index );
bool isEmbedded = node->customProperty( "embedded" ).toInt();
if ( testFlag( AllowNodeReorder ) )
{
// only root embedded nodes can be reordered
if ( !isEmbedded || ( isEmbedded && node->parent() && !node->parent()->customProperty( "embedded" ).toInt() ) )
f |= Qt::ItemIsDragEnabled;
}
if ( testFlag( AllowNodeChangeVisibility ) && ( QgsLayerTree::isLayer( node ) || QgsLayerTree::isGroup( node ) ) )
f |= Qt::ItemIsUserCheckable;
if ( testFlag( AllowNodeReorder ) && QgsLayerTree::isGroup( node ) && !isEmbedded )
f |= Qt::ItemIsDropEnabled;
return f;
}
bool QgsLayerTreeModel::setData( const QModelIndex& index, const QVariant& value, int role )
{
QgsLayerTreeModelLegendNode *sym = index2legendNode( index );
if ( sym )
{
if ( role == Qt::CheckStateRole && !testFlag( AllowLegendChangeState ) )
return false;
bool res = sym->setData( value, role );
if ( res )
emit dataChanged( index, index );
return res;
}
QgsLayerTreeNode* node = index2node( index );
if ( !node )
return QgsLayerTreeModel::setData( index, value, role );
if ( role == Qt::CheckStateRole )
{
if ( !testFlag( AllowNodeChangeVisibility ) )
return false;
if ( QgsLayerTree::isLayer( node ) )
{
QgsLayerTreeLayer* layer = QgsLayerTree::toLayer( node );
layer->setVisible( static_cast< Qt::CheckState >( value.toInt() ) );
return true;
}
if ( QgsLayerTree::isGroup( node ) )
{
QgsLayerTreeGroup* group = QgsLayerTree::toGroup( node );
group->setVisible( static_cast< Qt::CheckState >( value.toInt() ) );
return true;
}
return true;
}
else if ( role == Qt::EditRole )
{
if ( !testFlag( AllowNodeRename ) )
return false;
if ( QgsLayerTree::isLayer( node ) )
{
QgsLayerTreeLayer* layer = QgsLayerTree::toLayer( node );
layer->setLayerName( value.toString() );
emit dataChanged( index, index );
}
else if ( QgsLayerTree::isGroup( node ) )
{
QgsLayerTree::toGroup( node )->setName( value.toString() );
emit dataChanged( index, index );
}
}
return QAbstractItemModel::setData( index, value, role );
}
QModelIndex QgsLayerTreeModel::node2index( QgsLayerTreeNode* node ) const
{
if ( !node->parent() )
return QModelIndex(); // this is the only root item -> invalid index
QModelIndex parentIndex = node2index( node->parent() );
int row = node->parent()->children().indexOf( node );
Q_ASSERT( row >= 0 );
return index( row, 0, parentIndex );
}
static bool _isChildOfNode( QgsLayerTreeNode* child, QgsLayerTreeNode* node )
{
if ( !child->parent() )
return false;
if ( child->parent() == node )
return true;
return _isChildOfNode( child->parent(), node );
}
static bool _isChildOfNodes( QgsLayerTreeNode* child, const QList<QgsLayerTreeNode*>& nodes )
{
Q_FOREACH ( QgsLayerTreeNode* n, nodes )
{
if ( _isChildOfNode( child, n ) )
return true;
}
return false;
}
QList<QgsLayerTreeNode*> QgsLayerTreeModel::indexes2nodes( const QModelIndexList& list, bool skipInternal ) const
{
QList<QgsLayerTreeNode*> nodes;
Q_FOREACH ( const QModelIndex& index, list )
{
QgsLayerTreeNode* node = index2node( index );
if ( !node )
continue;
nodes << node;
}
if ( !skipInternal )
return nodes;
// remove any children of nodes if both parent node and children are selected
QList<QgsLayerTreeNode*> nodesFinal;
Q_FOREACH ( QgsLayerTreeNode* node, nodes )
{
if ( !_isChildOfNodes( node, nodes ) )
nodesFinal << node;
}
return nodesFinal;
}
bool QgsLayerTreeModel::isIndexSymbologyNode( const QModelIndex& index ) const
{
return nullptr != index2legendNode( index );
}
QgsLayerTreeLayer* QgsLayerTreeModel::layerNodeForSymbologyNode( const QModelIndex& index ) const
{
QgsLayerTreeModelLegendNode* symNode = index2legendNode( index );
return symNode ? symNode->layerNode() : nullptr;
}
QgsLayerTreeGroup*QgsLayerTreeModel::rootGroup() const
{
return mRootNode;
}
void QgsLayerTreeModel::setRootGroup( QgsLayerTreeGroup* newRootGroup )
{
beginResetModel();
disconnectFromRootNode();
Q_ASSERT( mLegend.isEmpty() );
mRootNode = newRootGroup;
endResetModel();
connectToRootNode();
}
void QgsLayerTreeModel::refreshLayerLegend( QgsLayerTreeLayer* nodeLayer )
{
// update title
QModelIndex idx = node2index( nodeLayer );
emit dataChanged( idx, idx );
// update children
int oldNodeCount = rowCount( idx );
beginRemoveRows( idx, 0, oldNodeCount - 1 );
removeLegendFromLayer( nodeLayer );
endRemoveRows();
addLegendToLayer( nodeLayer );
int newNodeCount = rowCount( idx );
// automatic collapse of legend nodes - useful if a layer has many legend nodes
if ( mAutoCollapseLegendNodesCount != -1 && oldNodeCount != newNodeCount && newNodeCount >= mAutoCollapseLegendNodesCount )
nodeLayer->setExpanded( false );
}
QModelIndex QgsLayerTreeModel::currentIndex() const
{
return mCurrentIndex;
}
void QgsLayerTreeModel::setCurrentIndex( const QModelIndex& currentIndex )
{
QModelIndex oldIndex = mCurrentIndex;
mCurrentIndex = currentIndex;
if ( oldIndex.isValid() )
emit dataChanged( oldIndex, oldIndex );
if ( currentIndex.isValid() )
emit dataChanged( currentIndex, currentIndex );
}
void QgsLayerTreeModel::setLayerTreeNodeFont( int nodeType, const QFont& font )
{
if ( nodeType == QgsLayerTreeNode::NodeGroup )
{
if ( mFontGroup != font )
{
mFontGroup = font;
recursivelyEmitDataChanged();
}
}
else if ( nodeType == QgsLayerTreeNode::NodeLayer )
{
if ( mFontLayer != font )
{
mFontLayer = font;
recursivelyEmitDataChanged();
}
}
else
{
QgsDebugMsg( "invalid node type" );
}
}
QFont QgsLayerTreeModel::layerTreeNodeFont( int nodeType ) const
{
if ( nodeType == QgsLayerTreeNode::NodeGroup )
return mFontGroup;
else if ( nodeType == QgsLayerTreeNode::NodeLayer )
return mFontLayer;
else
{
QgsDebugMsg( "invalid node type" );
return QFont();
}
}
void QgsLayerTreeModel::setLegendFilterByScale( double scaleDenominator )
{
mLegendFilterByScale = scaleDenominator;
// this could be later done in more efficient way
// by just updating active legend nodes, without refreshing original legend nodes
Q_FOREACH ( QgsLayerTreeLayer* nodeLayer, mRootNode->findLayers() )
refreshLayerLegend( nodeLayer );
}
void QgsLayerTreeModel::setLegendFilterByMap( const QgsMapSettings* settings )
{
setLegendFilter( settings, /* useExtent = */ true );
}
void QgsLayerTreeModel::setLegendFilter( const QgsMapSettings* settings, bool useExtent, const QgsGeometry& polygon, bool useExpressions )
{
if ( settings && settings->hasValidSettings() )
{
mLegendFilterMapSettings.reset( new QgsMapSettings( *settings ) );
mLegendFilterMapSettings->setLayerStyleOverrides( mLayerStyleOverrides );
QgsMapHitTest::LayerFilterExpression exprs;
// collect expression filters
if ( useExpressions )
{
Q_FOREACH ( QgsLayerTreeLayer* nodeLayer, mRootNode->findLayers() )
{
bool enabled;
QString expr = QgsLayerTreeUtils::legendFilterByExpression( *nodeLayer, &enabled );
if ( enabled && !expr.isEmpty() )
{
exprs[ nodeLayer->layerId()] = expr;
}
}
}
bool polygonValid = !polygon.isEmpty() && polygon.type() == QGis::Polygon;
if ( useExpressions && !useExtent && !polygonValid ) // only expressions
{
mLegendFilterHitTest.reset( new QgsMapHitTest( *mLegendFilterMapSettings, exprs ) );
}
else
{
mLegendFilterHitTest.reset( new QgsMapHitTest( *mLegendFilterMapSettings, polygon, exprs ) );
}
mLegendFilterHitTest->run();
}
else
{
if ( !mLegendFilterMapSettings )
return; // no change
mLegendFilterMapSettings.reset();
mLegendFilterHitTest.reset();
}
// temporarily disable autocollapse so that legend nodes stay visible
int bkAutoCollapse = autoCollapseLegendNodes();
setAutoCollapseLegendNodes( -1 );
// this could be later done in more efficient way
// by just updating active legend nodes, without refreshing original legend nodes
Q_FOREACH ( QgsLayerTreeLayer* nodeLayer, mRootNode->findLayers() )
refreshLayerLegend( nodeLayer );
setAutoCollapseLegendNodes( bkAutoCollapse );
}
void QgsLayerTreeModel::setLegendMapViewData( double mapUnitsPerPixel, int dpi, double scale )
{
if ( mLegendMapViewDpi == dpi && qgsDoubleNear( mLegendMapViewMupp, mapUnitsPerPixel ) && qgsDoubleNear( mLegendMapViewScale, scale ) )
return;
mLegendMapViewMupp = mapUnitsPerPixel;
mLegendMapViewDpi = dpi;
mLegendMapViewScale = scale;
// now invalidate legend nodes!
legendInvalidateMapBasedData();
}
void QgsLayerTreeModel::legendMapViewData( double* mapUnitsPerPixel, int* dpi, double* scale )
{
if ( mapUnitsPerPixel ) *mapUnitsPerPixel = mLegendMapViewMupp;
if ( dpi ) *dpi = mLegendMapViewDpi;
if ( scale ) *scale = mLegendMapViewScale;
}
QMap<QString, QString> QgsLayerTreeModel::layerStyleOverrides() const
{
return mLayerStyleOverrides;
}
void QgsLayerTreeModel::setLayerStyleOverrides( const QMap<QString, QString>& overrides )
{
mLayerStyleOverrides = overrides;
}
void QgsLayerTreeModel::nodeWillAddChildren( QgsLayerTreeNode* node, int indexFrom, int indexTo )
{
Q_ASSERT( node );
beginInsertRows( node2index( node ), indexFrom, indexTo );
}
static QList<QgsLayerTreeLayer*> _layerNodesInSubtree( QgsLayerTreeNode* node, int indexFrom, int indexTo )
{
QList<QgsLayerTreeNode*> children = node->children();
QList<QgsLayerTreeLayer*> newLayerNodes;
for ( int i = indexFrom; i <= indexTo; ++i )
{
QgsLayerTreeNode* child = children.at( i );
if ( QgsLayerTree::isLayer( child ) )
newLayerNodes << QgsLayerTree::toLayer( child );
else if ( QgsLayerTree::isGroup( child ) )
newLayerNodes << QgsLayerTree::toGroup( child )->findLayers();
}
return newLayerNodes;
}
void QgsLayerTreeModel::nodeAddedChildren( QgsLayerTreeNode* node, int indexFrom, int indexTo )
{
Q_ASSERT( node );
endInsertRows();
Q_FOREACH ( QgsLayerTreeLayer* newLayerNode, _layerNodesInSubtree( node, indexFrom, indexTo ) )
connectToLayer( newLayerNode );
}
void QgsLayerTreeModel::nodeWillRemoveChildren( QgsLayerTreeNode* node, int indexFrom, int indexTo )
{
Q_ASSERT( node );
beginRemoveRows( node2index( node ), indexFrom, indexTo );
// disconnect from layers and remove their legend
Q_FOREACH ( QgsLayerTreeLayer* nodeLayer, _layerNodesInSubtree( node, indexFrom, indexTo ) )
disconnectFromLayer( nodeLayer );
}
void QgsLayerTreeModel::nodeRemovedChildren()
{
endRemoveRows();
}
void QgsLayerTreeModel::nodeVisibilityChanged( QgsLayerTreeNode* node )
{
Q_ASSERT( node );
QModelIndex index = node2index( node );
emit dataChanged( index, index );
}
void QgsLayerTreeModel::nodeCustomPropertyChanged( QgsLayerTreeNode* node, const QString& key )
{
if ( QgsLayerTree::isLayer( node ) && key == "showFeatureCount" )
refreshLayerLegend( QgsLayerTree::toLayer( node ) );
}
void QgsLayerTreeModel::nodeLayerLoaded()
{
QgsLayerTreeLayer* nodeLayer = qobject_cast<QgsLayerTreeLayer*>( sender() );
if ( !nodeLayer )
return;
// deferred connection to the layer
connectToLayer( nodeLayer );
}
void QgsLayerTreeModel::nodeLayerWillBeUnloaded()
{
QgsLayerTreeLayer* nodeLayer = qobject_cast<QgsLayerTreeLayer*>( sender() );
if ( !nodeLayer )
return;
disconnectFromLayer( nodeLayer );
// wait for the layer to appear again
connect( nodeLayer, SIGNAL( layerLoaded() ), this, SLOT( nodeLayerLoaded() ) );
}
void QgsLayerTreeModel::layerLegendChanged()
{
if ( !testFlag( ShowLegend ) )
return;
QgsMapLayer* layer = qobject_cast<QgsMapLayer*>( sender() );
if ( !layer )
return;
QgsLayerTreeLayer* nodeLayer = mRootNode->findLayer( layer->id() );
if ( !nodeLayer )
return;
refreshLayerLegend( nodeLayer );
}
void QgsLayerTreeModel::layerNeedsUpdate()
{
QgsMapLayer* layer = qobject_cast<QgsMapLayer*>( sender() );
if ( !layer )
return;
QgsLayerTreeLayer* nodeLayer = mRootNode->findLayer( layer->id() );
if ( !nodeLayer )
return;
QModelIndex index = node2index( nodeLayer );
emit dataChanged( index, index );
if ( nodeLayer->customProperty( "showFeatureCount" ).toInt() )
refreshLayerLegend( nodeLayer );
}
void QgsLayerTreeModel::legendNodeDataChanged()
{
QgsLayerTreeModelLegendNode* legendNode = qobject_cast<QgsLayerTreeModelLegendNode*>( sender() );
if ( !legendNode )
return;
QModelIndex index = legendNode2index( legendNode );
if ( index.isValid() )
emit dataChanged( index, index );
}
void QgsLayerTreeModel::connectToLayer( QgsLayerTreeLayer* nodeLayer )
{
if ( !nodeLayer->layer() )
{
// in order to connect to layer, we need to have it loaded.
// keep an eye on the layer ID: once loaded, we will use it
connect( nodeLayer, SIGNAL( layerLoaded() ), this, SLOT( nodeLayerLoaded() ) );
return;
}
// watch if the layer is getting removed
connect( nodeLayer, SIGNAL( layerWillBeUnloaded() ), this, SLOT( nodeLayerWillBeUnloaded() ) );
if ( testFlag( ShowLegend ) )
{
addLegendToLayer( nodeLayer );
// automatic collapse of legend nodes - useful if a layer has many legend nodes
if ( !mRootNode->customProperty( "loading" ).toBool() )
{
if ( mAutoCollapseLegendNodesCount != -1 && rowCount( node2index( nodeLayer ) ) >= mAutoCollapseLegendNodesCount )
nodeLayer->setExpanded( false );
}
}
QgsMapLayer* layer = nodeLayer->layer();
connect( layer, SIGNAL( legendChanged() ), this, SLOT( layerLegendChanged() ), Qt::UniqueConnection );
if ( layer->type() == QgsMapLayer::VectorLayer )
{
// using unique connection because there may be temporarily more nodes for a layer than just one
// which would create multiple connections, however disconnect() would disconnect all multiple connections
// even if we wanted to disconnect just one connection in each call.
connect( layer, SIGNAL( editingStarted() ), this, SLOT( layerNeedsUpdate() ), Qt::UniqueConnection );
connect( layer, SIGNAL( editingStopped() ), this, SLOT( layerNeedsUpdate() ), Qt::UniqueConnection );
connect( layer, SIGNAL( layerModified() ), this, SLOT( layerNeedsUpdate() ), Qt::UniqueConnection );
connect( layer, SIGNAL( layerNameChanged() ), this, SLOT( layerNeedsUpdate() ), Qt::UniqueConnection );
}
}
// try to find out if the layer ID is present in the tree multiple times
static int _numLayerCount( QgsLayerTreeGroup* group, const QString& layerId )
{
int count = 0;
Q_FOREACH ( QgsLayerTreeNode* child, group->children() )
{
if ( QgsLayerTree::isLayer( child ) )
{
if ( QgsLayerTree::toLayer( child )->layerId() == layerId )
count++;
}
else if ( QgsLayerTree::isGroup( child ) )
{
count += _numLayerCount( QgsLayerTree::toGroup( child ), layerId );
}
}
return count;
}
void QgsLayerTreeModel::disconnectFromLayer( QgsLayerTreeLayer* nodeLayer )
{
disconnect( nodeLayer, nullptr, this, nullptr ); // disconnect from delayed load of layer
if ( !nodeLayer->layer() )
return; // we were never connected
if ( testFlag( ShowLegend ) )
{
removeLegendFromLayer( nodeLayer );
}
if ( _numLayerCount( mRootNode, nodeLayer->layerId() ) == 1 )
{
// last instance of the layer in the tree: disconnect from all signals from layer!
disconnect( nodeLayer->layer(), nullptr, this, nullptr );
}
}
void QgsLayerTreeModel::connectToLayers( QgsLayerTreeGroup* parentGroup )
{
Q_FOREACH ( QgsLayerTreeNode* node, parentGroup->children() )
{
if ( QgsLayerTree::isGroup( node ) )
connectToLayers( QgsLayerTree::toGroup( node ) );
else if ( QgsLayerTree::isLayer( node ) )
connectToLayer( QgsLayerTree::toLayer( node ) );
}
}
void QgsLayerTreeModel::disconnectFromLayers( QgsLayerTreeGroup* parentGroup )
{
Q_FOREACH ( QgsLayerTreeNode* node, parentGroup->children() )
{
if ( QgsLayerTree::isGroup( node ) )
disconnectFromLayers( QgsLayerTree::toGroup( node ) );
else if ( QgsLayerTree::isLayer( node ) )
disconnectFromLayer( QgsLayerTree::toLayer( node ) );
}
}
void QgsLayerTreeModel::connectToRootNode()
{
Q_ASSERT( mRootNode );
connect( mRootNode, SIGNAL( willAddChildren( QgsLayerTreeNode*, int, int ) ), this, SLOT( nodeWillAddChildren( QgsLayerTreeNode*, int, int ) ) );
connect( mRootNode, SIGNAL( addedChildren( QgsLayerTreeNode*, int, int ) ), this, SLOT( nodeAddedChildren( QgsLayerTreeNode*, int, int ) ) );
connect( mRootNode, SIGNAL( willRemoveChildren( QgsLayerTreeNode*, int, int ) ), this, SLOT( nodeWillRemoveChildren( QgsLayerTreeNode*, int, int ) ) );
connect( mRootNode, SIGNAL( removedChildren( QgsLayerTreeNode*, int, int ) ), this, SLOT( nodeRemovedChildren() ) );
connect( mRootNode, SIGNAL( visibilityChanged( QgsLayerTreeNode*, Qt::CheckState ) ), this, SLOT( nodeVisibilityChanged( QgsLayerTreeNode* ) ) );
connect( mRootNode, SIGNAL( customPropertyChanged( QgsLayerTreeNode*, QString ) ), this, SLOT( nodeCustomPropertyChanged( QgsLayerTreeNode*, QString ) ) );
connectToLayers( mRootNode );
}
void QgsLayerTreeModel::disconnectFromRootNode()
{
disconnect( mRootNode, nullptr, this, nullptr );
disconnectFromLayers( mRootNode );
}
void QgsLayerTreeModel::recursivelyEmitDataChanged( const QModelIndex& idx )
{
QgsLayerTreeNode* node = index2node( idx );
if ( !node )
return;
int count = node->children().count();
if ( count == 0 )
return;
emit dataChanged( index( 0, 0, idx ), index( count - 1, 0, idx ) );
for ( int i = 0; i < count; ++i )
recursivelyEmitDataChanged( index( i, 0, idx ) );
}
Qt::DropActions QgsLayerTreeModel::supportedDropActions() const
{
return Qt::CopyAction | Qt::MoveAction;
}
QStringList QgsLayerTreeModel::mimeTypes() const
{
QStringList types;
types << "application/qgis.layertreemodeldata";
return types;
}
QMimeData* QgsLayerTreeModel::mimeData( const QModelIndexList& indexes ) const
{
// Sort the indexes. Depending on how the user selected the items, the indexes may be unsorted.
QModelIndexList sortedIndexes = indexes;
qSort( sortedIndexes.begin(), sortedIndexes.end(), qLess<QModelIndex>() );
QList<QgsLayerTreeNode*> nodesFinal = indexes2nodes( sortedIndexes, true );
if ( nodesFinal.isEmpty() )
return nullptr;
QMimeData *mimeData = new QMimeData();
QDomDocument doc;
QDomElement rootElem = doc.createElement( "layer_tree_model_data" );
Q_FOREACH ( QgsLayerTreeNode* node, nodesFinal )
node->writeXML( rootElem );
doc.appendChild( rootElem );
QString txt = doc.toString();
mimeData->setData( "application/qgis.layertreemodeldata", txt.toUtf8() );
return mimeData;
}
bool QgsLayerTreeModel::dropMimeData( const QMimeData* data, Qt::DropAction action, int row, int column, const QModelIndex& parent )
{
if ( action == Qt::IgnoreAction )
return true;
if ( !data->hasFormat( "application/qgis.layertreemodeldata" ) )
return false;
if ( column >= columnCount( parent ) )
return false;
QgsLayerTreeNode* nodeParent = index2node( parent );
if ( !QgsLayerTree::isGroup( nodeParent ) )
return false;
QByteArray encodedData = data->data( "application/qgis.layertreemodeldata" );
QDomDocument doc;
if ( !doc.setContent( QString::fromUtf8( encodedData ) ) )
return false;
QDomElement rootElem = doc.documentElement();
if ( rootElem.tagName() != "layer_tree_model_data" )
return false;
QList<QgsLayerTreeNode*> nodes;
QDomElement elem = rootElem.firstChildElement();
while ( !elem.isNull() )
{
QgsLayerTreeNode* node = QgsLayerTreeNode::readXML( elem );
if ( node )
nodes << node;
elem = elem.nextSiblingElement();
}
if ( nodes.isEmpty() )
return false;
if ( parent.isValid() && row == -1 )