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[FEATURE] allow to drag'n'drop layer across several QGIS instances

fixes #20467
  • Loading branch information
3nids committed Mar 26, 2020
1 parent afbb204 commit 202ae7b01d8b11c768dca57dddfe5182374d9f5a
Showing with 59 additions and 31 deletions.
  1. +59 −31 src/core/layertree/qgslayertreemodel.cpp
@@ -13,17 +13,16 @@
* *
***************************************************************************/

#include <QMimeData>
#include <QTextStream>

#include "qgslayertreemodel.h"

#include "qgslayertree.h"
#include "qgslayertreeutils.h"
#include "qgslayertreemodellegendnode.h"
#include "qgsproject.h"
#include "qgsapplication.h"

#include <QMimeData>
#include <QTextStream>

#include "qgsdataitem.h"
#include "qgsmaphittest.h"
#include "qgsmaplayer.h"
@@ -34,6 +33,8 @@
#include "qgsrenderer.h"
#include "qgssymbollayerutils.h"
#include "qgsvectorlayer.h"
#include "qgslayerdefinition.h"


QgsLayerTreeModel::QgsLayerTreeModel( QgsLayerTree *rootNode, QObject *parent )
: QAbstractItemModel( parent )
@@ -1052,15 +1053,25 @@ QMimeData *QgsLayerTreeModel::mimeData( const QModelIndexList &indexes ) const

QMimeData *mimeData = new QMimeData();

QDomDocument doc;
QDomElement rootElem = doc.createElement( QStringLiteral( "layer_tree_model_data" ) );
QDomDocument layerTreeDoc;
QDomElement rootLayerTreeElem = layerTreeDoc.createElement( QStringLiteral( "layer_tree_model_data" ) );

for ( QgsLayerTreeNode *node : qgis::as_const( nodesFinal ) )
node->writeXml( rootElem, QgsReadWriteContext() );
doc.appendChild( rootElem );
QString txt = doc.toString();
{
node->writeXml( rootLayerTreeElem, QgsReadWriteContext() );
}
layerTreeDoc.appendChild( rootLayerTreeElem );

mimeData->setData( QStringLiteral( "application/qgis.layertreemodeldata" ), txt.toUtf8() );
QString errorMessage;
QgsReadWriteContext readWriteContext;
QDomDocument layerDefinitionsDoc( QStringLiteral( "qgis-layer-definition" ) );
QgsLayerDefinition::exportLayerDefinition( layerDefinitionsDoc, nodesFinal, errorMessage, QgsReadWriteContext() );

QString txt = layerDefinitionsDoc.toString();

mimeData->setData( QStringLiteral( "application/qgis.layertreemodeldata" ), layerTreeDoc.toString().toUtf8() );
mimeData->setData( QStringLiteral( "application/qgis.application.pid" ), QString::number( QCoreApplication::applicationPid() ).toUtf8() );
mimeData->setData( QStringLiteral( "application/qgis.layertree.layerdefinitions" ), txt.toUtf8() );
mimeData->setData( QStringLiteral( "application/x-vnd.qgis.qgis.uri" ), QgsMimeDataUtils::layerTreeNodesToUriList( nodesFinal ) );

return mimeData;
@@ -1081,36 +1092,53 @@ bool QgsLayerTreeModel::dropMimeData( const QMimeData *data, Qt::DropAction acti
if ( !QgsLayerTree::isGroup( nodeParent ) )
return false;

QByteArray encodedData = data->data( QStringLiteral( "application/qgis.layertreemodeldata" ) );
if ( parent.isValid() && row == -1 )
row = 0; // if dropped directly onto group item, insert at first position

QDomDocument doc;
if ( !doc.setContent( QString::fromUtf8( encodedData ) ) )
return false;
// if we are coming from another QGIS instance, we need to add the layers too
bool ok = false;
// the application pid is only provided from QGIS 3.14, so do not check to OK before defaulting to moving in the legend
int qgisPid = data->data( QStringLiteral( "application/qgis.application.pid" ) ).toInt( &ok );

QDomElement rootElem = doc.documentElement();
if ( rootElem.tagName() != QLatin1String( "layer_tree_model_data" ) )
return false;
if ( ok && qgisPid != QString::number( QCoreApplication::applicationPid() ) )
{
QByteArray encodedLayerDefinitionData = data->data( QStringLiteral( "application/qgis.layertree.layerdefinitions" ) );
QDomDocument layerDefinitionDoc;
if ( !layerDefinitionDoc.setContent( QString::fromUtf8( encodedLayerDefinitionData ) ) )
return false;
QgsReadWriteContext context;
QString errorMessage;
QgsLayerDefinition::loadLayerDefinition( layerDefinitionDoc, QgsProject::instance(), QgsLayerTree::toGroup( nodeParent ), errorMessage, context );
}
else
{
QByteArray encodedLayerTreeData = data->data( QStringLiteral( "application/qgis.layertreemodeldata" ) );

QList<QgsLayerTreeNode *> nodes;
QDomDocument layerTreeDoc;
if ( !layerTreeDoc.setContent( QString::fromUtf8( encodedLayerTreeData ) ) )
return false;

QDomElement elem = rootElem.firstChildElement();
while ( !elem.isNull() )
{
QgsLayerTreeNode *node = QgsLayerTreeNode::readXml( elem, QgsProject::instance() );
if ( node )
nodes << node;
QDomElement rootLayerTreeElem = layerTreeDoc.documentElement();
if ( rootLayerTreeElem.tagName() != QLatin1String( "layer_tree_model_data" ) )
return false;

elem = elem.nextSiblingElement();
}
QList<QgsLayerTreeNode *> nodes;

if ( nodes.isEmpty() )
return false;
QDomElement elem = rootLayerTreeElem.firstChildElement();
while ( !elem.isNull() )
{
QgsLayerTreeNode *node = QgsLayerTreeNode::readXml( elem, QgsProject::instance() );
if ( node )
nodes << node;

if ( parent.isValid() && row == -1 )
row = 0; // if dropped directly onto group item, insert at first position
elem = elem.nextSiblingElement();
}

QgsLayerTree::toGroup( nodeParent )->insertChildNodes( row, nodes );
if ( nodes.isEmpty() )
return false;

QgsLayerTree::toGroup( nodeParent )->insertChildNodes( row, nodes );
}
return true;
}

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