qgsmapcanvastracer.h

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#ifndef QGSMAPCANVASTRACER_H
#define QGSMAPCANVASTRACER_H

#include "qgstracer.h"

class QAction;
class QgsMapCanvas;
class QgsMessageBar;
class QgsMessageBarItem;

class GUI_EXPORT QgsMapCanvasTracer : public QgsTracer
{
    Q_OBJECT

  public:
    explicit QgsMapCanvasTracer( QgsMapCanvas* canvas, QgsMessageBar* messageBar = 0 );
    ~QgsMapCanvasTracer();

    QAction* actionEnableTracing() const { return mActionEnableTracing; }

    void setActionEnableTracing( QAction* action ) { mActionEnableTracing = action; }

    static QgsMapCanvasTracer* tracerForCanvas( QgsMapCanvas* canvas );

    void reportError( PathError err, bool addingVertex );

  protected:
    virtual void configure();

  private slots:
    void onCurrentLayerChanged();

  private:
    QgsMapCanvas* mCanvas;
    QgsMessageBar* mMessageBar;
    QgsMessageBarItem* mLastMessage;

    QAction* mActionEnableTracing;

    static QHash<QgsMapCanvas*, QgsMapCanvasTracer*> sTracers;
};

#endif // QGSMAPCANVASTRACER_H