QgsLayerTreeMapCanvasBridge::QgsLayerTreeMapCanvasBridge( QgsLayerTree *root, QgsMapCanvas *canvas, QObject *parent )
: QObject( parent )
, mRoot( root )
, mCanvas( canvas )
, mPendingCanvasUpdate( false )
, mAutoSetupOnFirstLayer( true )
, mHasLayersLoaded( !root->findLayers().isEmpty() )
{
connect( root, &QgsLayerTreeGroup::customPropertyChanged, this, &QgsLayerTreeMapCanvasBridge::nodeCustomPropertyChanged );
connect( root, &QgsLayerTreeNode::visibilityChanged, this, &QgsLayerTreeMapCanvasBridge::nodeVisibilityChanged );
connect( root, &QgsLayerTree::layerOrderChanged, this, &QgsLayerTreeMapCanvasBridge::deferredSetCanvasLayers );
setCanvasLayers();
}
QgsLayerTreeMapCanvasBridge::QgsLayerTreeMapCanvasBridge( QgsLayerTreeGroup *root, QgsMapCanvas *canvas, QObject* parent )
: QObject( parent )
, mRoot( root )
, mCanvas( canvas )
, mPendingCanvasUpdate( false )
, mHasCustomLayerOrder( false )
, mAutoSetupOnFirstLayer( true )
, mAutoEnableCrsTransform( true )
, mLastLayerCount( root->findLayers().count() )
{
connect( root, SIGNAL( addedChildren( QgsLayerTreeNode*, int, int ) ), this, SLOT( nodeAddedChildren( QgsLayerTreeNode*, int, int ) ) );
connect( root, SIGNAL( customPropertyChanged( QgsLayerTreeNode*, QString ) ), this, SLOT( nodeCustomPropertyChanged( QgsLayerTreeNode*, QString ) ) );
connect( root, SIGNAL( removedChildren( QgsLayerTreeNode*, int, int ) ), this, SLOT( nodeRemovedChildren() ) );
connect( root, SIGNAL( visibilityChanged( QgsLayerTreeNode*, Qt::CheckState ) ), this, SLOT( nodeVisibilityChanged() ) );
setCanvasLayers();
}
LayerTreeMapCanvasBridge::LayerTreeMapCanvasBridge( LayerTreeModel* model, MapSettings* mapSettings, QObject* parent )
: QObject( parent )
, mModel( model )
, mMapSettings( mapSettings )
, mPendingCanvasUpdate( false )
, mHasCustomLayerOrder( false )
, mAutoSetupOnFirstLayer( false )
, mAutoEnableCrsTransform( true )
, mNoLayersLoaded( !model->rootGroup()->findLayers().isEmpty() )
{
connect( model->rootGroup(), &QgsLayerTreeGroup::addedChildren, this, &LayerTreeMapCanvasBridge::nodeAddedChildren );
connect( model->rootGroup(), &QgsLayerTreeGroup::customPropertyChanged, this, &LayerTreeMapCanvasBridge::nodeCustomPropertyChanged );
connect( model->rootGroup(), &QgsLayerTreeGroup::removedChildren, this, &LayerTreeMapCanvasBridge::nodeRemovedChildren );
connect( model->rootGroup(), &QgsLayerTreeGroup::visibilityChanged, this, &LayerTreeMapCanvasBridge::nodeVisibilityChanged );
connect( model, &LayerTreeModel::mapThemeChanged, this, &LayerTreeMapCanvasBridge::mapThemeChanged );
setCanvasLayers();
}
void QgsLayerTreeMapCanvasBridge::setCanvasLayers( QgsLayerTreeNode *node, QList<QgsMapLayer *> &canvasLayers, QList<QgsMapLayer *> &overviewLayers, QList<QgsMapLayer *> &allLayers )
{
if ( QgsLayerTree::isLayer( node ) )
{
QgsLayerTreeLayer *nodeLayer = QgsLayerTree::toLayer( node );
if ( nodeLayer->layer() && nodeLayer->layer()->isSpatial() )
{
allLayers << nodeLayer->layer();
if ( nodeLayer->isVisible() )
canvasLayers << nodeLayer->layer();
if ( nodeLayer->customProperty( QStringLiteral( "overview" ), 0 ).toInt() )
overviewLayers << nodeLayer->layer();
}
}
const QList<QgsLayerTreeNode *> children = node->children();
for ( QgsLayerTreeNode *child : children )
setCanvasLayers( child, canvasLayers, overviewLayers, allLayers );
}
void QgsLayerTreeMapCanvasBridge::setCanvasLayers()
{
QList<QgsMapLayer *> canvasLayers, overviewLayers, allLayerOrder;
if ( mRoot->hasCustomLayerOrder() )
{
const QList<QgsMapLayer *> customOrderLayers = mRoot->customLayerOrder();
for ( const QgsMapLayer *layer : customOrderLayers )
{
QgsLayerTreeLayer *nodeLayer = mRoot->findLayer( layer->id() );
if ( nodeLayer )
{
if ( !nodeLayer->layer()->isSpatial() )
continue;
allLayerOrder << nodeLayer->layer();
if ( nodeLayer->isVisible() )
canvasLayers << nodeLayer->layer();
if ( nodeLayer->customProperty( QStringLiteral( "overview" ), 0 ).toInt() )
overviewLayers << nodeLayer->layer();
}
}
}
else
{
setCanvasLayers( mRoot, canvasLayers, overviewLayers, allLayerOrder );
}
const QList<QgsLayerTreeLayer *> layerNodes = mRoot->findLayers();
int currentSpatialLayerCount = 0;
for ( QgsLayerTreeLayer *layerNode : layerNodes )
{
if ( layerNode->layer() && layerNode->layer()->isSpatial() )
currentSpatialLayerCount++;
}
bool firstLayers = mAutoSetupOnFirstLayer && !mHasLayersLoaded && currentSpatialLayerCount != 0;
mCanvas->setLayers( canvasLayers );
if ( mOverviewCanvas )
mOverviewCanvas->setLayers( overviewLayers );
if ( firstLayers )
{
// if we are moving from zero to non-zero layers, let's zoom to those data
mCanvas->zoomToFullExtent();
}
if ( !mFirstCRS.isValid() )
{
// find out what is the first used CRS in case we may need to turn on OTF projections later
for ( const QgsLayerTreeLayer *layerNode : layerNodes )
{
if ( layerNode->layer() && layerNode->layer()->crs().isValid() )
{
mFirstCRS = layerNode->layer()->crs();
break;
}
}
}
if ( mFirstCRS.isValid() && firstLayers )
{
QgsProject::instance()->setCrs( mFirstCRS );
}
mHasLayersLoaded = currentSpatialLayerCount;
if ( currentSpatialLayerCount == 0 )
mFirstCRS = QgsCoordinateReferenceSystem();
mPendingCanvasUpdate = false;
emit canvasLayersChanged( canvasLayers );
}
