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qgslayertreelayer.cpp
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qgslayertreelayer.cpp
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/***************************************************************************
qgslayertreelayer.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 "qgslayertreelayer.h"
#include "qgslayertreeutils.h"
#include "qgsmaplayer.h"
#include "qgsproject.h"
QgsLayerTreeLayer::QgsLayerTreeLayer( QgsMapLayer *layer )
: QgsLayerTreeNode( NodeLayer, true )
, mRef( layer )
, mLayerName( layer->name() )
{
attachToLayer();
}
QgsLayerTreeLayer::QgsLayerTreeLayer( const QString &layerId, const QString &name, const QString &source, const QString &provider )
: QgsLayerTreeNode( NodeLayer, true )
, mRef( layerId, name, source, provider )
, mLayerName( name.isEmpty() ? QStringLiteral( "(?)" ) : name )
{
}
QgsLayerTreeLayer::QgsLayerTreeLayer( const QgsLayerTreeLayer &other )
: QgsLayerTreeNode( other )
, mRef( other.mRef )
, mLayerName( other.mLayerName )
{
attachToLayer();
}
void QgsLayerTreeLayer::resolveReferences( const QgsProject *project, bool looseMatching )
{
if ( mRef )
return; // already assigned
if ( !looseMatching )
{
mRef.resolve( project );
}
else
{
mRef.resolveWeakly( project );
}
if ( !mRef )
return;
attachToLayer();
emit layerLoaded();
}
void QgsLayerTreeLayer::attachToLayer()
{
if ( !mRef )
return;
connect( mRef.layer, &QgsMapLayer::nameChanged, this, &QgsLayerTreeLayer::layerNameChanged );
connect( mRef.layer, &QgsMapLayer::willBeDeleted, this, &QgsLayerTreeLayer::layerWillBeDeleted );
}
QString QgsLayerTreeLayer::name() const
{
return mRef ? mRef->name() : mLayerName;
}
void QgsLayerTreeLayer::setName( const QString &n )
{
if ( mRef )
{
if ( mRef->name() == n )
return;
mRef->setName( n );
// no need to emit signal: we will be notified from layer's nameChanged() signal
}
else
{
if ( mLayerName == n )
return;
mLayerName = n;
emit nameChanged( this, n );
}
}
QgsLayerTreeLayer *QgsLayerTreeLayer::readXml( QDomElement &element, const QgsReadWriteContext &context )
{
Q_UNUSED( context );
if ( element.tagName() != QLatin1String( "layer-tree-layer" ) )
return nullptr;
QString layerID = element.attribute( QStringLiteral( "id" ) );
QString layerName = element.attribute( QStringLiteral( "name" ) );
QString providerKey = element.attribute( QStringLiteral( "providerKey" ) );
QString source = context.pathResolver().readPath( element.attribute( QStringLiteral( "source" ) ) );
Qt::CheckState checked = QgsLayerTreeUtils::checkStateFromXml( element.attribute( QStringLiteral( "checked" ) ) );
bool isExpanded = ( element.attribute( QStringLiteral( "expanded" ), QStringLiteral( "1" ) ) == QLatin1String( "1" ) );
// needs to have the layer reference resolved later
QgsLayerTreeLayer *nodeLayer = new QgsLayerTreeLayer( layerID, layerName, source, providerKey );
nodeLayer->readCommonXml( element );
nodeLayer->setItemVisibilityChecked( checked != Qt::Unchecked );
nodeLayer->setExpanded( isExpanded );
return nodeLayer;
}
QgsLayerTreeLayer *QgsLayerTreeLayer::readXml( QDomElement &element, const QgsProject *project, const QgsReadWriteContext &context )
{
QgsLayerTreeLayer *node = readXml( element, context );
if ( node )
node->resolveReferences( project );
return node;
}
void QgsLayerTreeLayer::writeXml( QDomElement &parentElement, const QgsReadWriteContext &context )
{
QDomDocument doc = parentElement.ownerDocument();
QDomElement elem = doc.createElement( QStringLiteral( "layer-tree-layer" ) );
elem.setAttribute( QStringLiteral( "id" ), layerId() );
elem.setAttribute( QStringLiteral( "name" ), name() );
if ( mRef )
{
elem.setAttribute( QStringLiteral( "source" ), context.pathResolver().writePath( mRef->publicSource() ) );
elem.setAttribute( QStringLiteral( "providerKey" ), mRef->dataProvider() ? mRef->dataProvider()->name() : QString() );
}
elem.setAttribute( QStringLiteral( "checked" ), mChecked ? QStringLiteral( "Qt::Checked" ) : QStringLiteral( "Qt::Unchecked" ) );
elem.setAttribute( QStringLiteral( "expanded" ), mExpanded ? "1" : "0" );
writeCommonXml( elem );
parentElement.appendChild( elem );
}
QString QgsLayerTreeLayer::dump() const
{
return QStringLiteral( "LAYER: %1 checked=%2 expanded=%3 id=%4\n" ).arg( name() ).arg( mChecked ).arg( mExpanded ).arg( layerId() );
}
QgsLayerTreeLayer *QgsLayerTreeLayer::clone() const
{
return new QgsLayerTreeLayer( *this );
}
void QgsLayerTreeLayer::layerWillBeDeleted()
{
Q_ASSERT( mRef );
mLayerName = mRef->name();
// in theory we do not even need to do this - the weak ref should clear itself
mRef.layer.clear();
// layerId stays in the reference
emit layerWillBeUnloaded();
}
void QgsLayerTreeLayer::layerNameChanged()
{
Q_ASSERT( mRef );
emit nameChanged( this, mRef->name() );
}