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47 lines
1.7 KiB
Plaintext
47 lines
1.7 KiB
Plaintext
/**
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* The QgsLayerTreeMapCanvasBridge class takes care of updates of layer set
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* for QgsMapCanvas from a layer tree. The class listens to the updates in the layer tree
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* and updates the list of layers for rendering whenever some layers are added, removed,
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* or their visibility changes.
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*
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* The update of layers is not done immediately - it is postponed, so a series of updates
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* to the layer tree will trigger just one update of canvas layers.
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*
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* Also allows the client to override the default order of layers. This is useful
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* in advanced cases where the grouping in layer tree should be independent from the actual
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* order in the canvas.
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*
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* @note added in 2.4
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*/
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class QgsLayerTreeMapCanvasBridge : QObject
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{
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%TypeHeaderCode
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#include <qgslayertreemapcanvasbridge.h>
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%End
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public:
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//! Constructor: does not take ownership of the layer tree nor canvas
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QgsLayerTreeMapCanvasBridge( QgsLayerTree *root, QgsMapCanvas *canvas, QObject *parent /TransferThis/ = 0 );
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QgsLayerTree *rootGroup() const;
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QgsMapCanvas *mapCanvas() const;
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//! Associates overview canvas with the bridge, so the overview will be updated whenever main canvas is updated
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//! @note added in 3.0
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void setOvervewCanvas( QgsMapOverviewCanvas *overviewCanvas );
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//! Returns associated overview canvas (may be null)
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//! @note added in 3.0
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QgsMapOverviewCanvas *overviewCanvas() const;
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//! if enabled, will automatically set full canvas extent and destination CRS + map units
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//! when first layer(s) are added
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void setAutoSetupOnFirstLayer( bool enabled );
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bool autoSetupOnFirstLayer() const;
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void setCanvasLayers();
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signals:
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void canvasLayersChanged( const QList< QgsMapLayer* > &layers );
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};
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