C++ QgsVectorLayer::triggerRepaint方法代码示例

void QgsMapToolShowHideLabels::showHideLabels( QMouseEvent *e )
{
  QgsMapLayer *layer = mCanvas->currentLayer();
  QgsVectorLayer *vlayer = dynamic_cast<QgsVectorLayer *>( layer );
  if ( !vlayer )
    return;

  bool doHide = e->modifiers() & Qt::ShiftModifier;
  QString editTxt = doHide ? tr( "Hid labels" ) : tr( "Showed labels" );
  vlayer->beginEditCommand( editTxt );

  bool labelChanged = false;
  if ( doHide )
  {
    QList<QgsLabelPosition> positions;
    if ( selectedLabelFeatures( vlayer, positions ) )
    {
      for ( const QgsLabelPosition &pos : qgis::as_const( positions ) )
      {
        if ( showHide( pos, false ) )
          labelChanged = true;
      }
    }
  }
  else
  {
    QgsFeatureIds fids;
    if ( selectedFeatures( vlayer, fids ) )
    {
      for ( const QgsFeatureId &fid : qgis::as_const( fids ) )
      {
        QgsLabelPosition pos;
        pos.featureId = fid;
        pos.layerID = vlayer->id();

        // we want to show labels...
        pos.isDiagram = false;
        if ( showHide( pos, true ) )
          labelChanged = true;

        // ... and diagrams
        pos.isDiagram = true;
        if ( showHide( pos, true ) )
          labelChanged = true;
      }
    }
  }

  if ( labelChanged )
  {
    vlayer->endEditCommand();
    vlayer->triggerRepaint();
  }
  else
  {
    vlayer->destroyEditCommand();
  }
}

void QgsSymbolLegendNode::checkAll( bool state )
{
  QgsVectorLayer *vlayer = qobject_cast<QgsVectorLayer *>( mLayerNode->layer() );
  if ( !vlayer || !vlayer->renderer() )
    return;

  const QgsLegendSymbolList symbolList = vlayer->renderer()->legendSymbolItems();
  for ( const auto &item : symbolList )
  {
    vlayer->renderer()->checkLegendSymbolItem( item.ruleKey(), state );
  }

  emit dataChanged();
  vlayer->triggerRepaint();
}

void QgsSymbolLegendNode::setSymbol( QgsSymbol *symbol )
{
  if ( !symbol )
    return;

  QgsVectorLayer *vlayer = qobject_cast<QgsVectorLayer *>( mLayerNode->layer() );
  if ( !vlayer || !vlayer->renderer() )
    return;

  mItem.setSymbol( symbol );
  vlayer->renderer()->setLegendSymbolItem( mItem.ruleKey(), symbol );

  mPixmap = QPixmap();

  emit dataChanged();
  vlayer->triggerRepaint();
}

void QgsSymbolLegendNode::setSymbol( QgsSymbol *symbol )
{
  if ( !symbol )
    return;

  std::unique_ptr< QgsSymbol > s( symbol ); // this method takes ownership of symbol
  QgsVectorLayer *vlayer = qobject_cast<QgsVectorLayer *>( mLayerNode->layer() );
  if ( !vlayer || !vlayer->renderer() )
    return;

  mItem.setSymbol( s.get() ); // doesn't transfer ownership
  vlayer->renderer()->setLegendSymbolItem( mItem.ruleKey(), s.release() ); // DOES transfer ownership!

  mPixmap = QPixmap();

  emit dataChanged();
  vlayer->triggerRepaint();
}

bool QgsSymbolV2LegendNode::setData( const QVariant& value, int role )
{
    if ( role != Qt::CheckStateRole )
        return false;

    if ( !mItem.isCheckable() )
        return false;

    QgsVectorLayer* vlayer = qobject_cast<QgsVectorLayer*>( mLayerNode->layer() );
    if ( !vlayer || !vlayer->rendererV2() )
        return false;

    vlayer->rendererV2()->checkLegendSymbolItem( mItem.ruleKey(), value == Qt::Checked );

    emit dataChanged();

    vlayer->triggerRepaint();

    return true;
}

void QgsMapToolChangeLabelProperties::applyChanges( const QgsAttributeMap& changes )
{
  QgsVectorLayer* vlayer = mCurrentLabel.layer;
  if ( !vlayer )
    return;

  if ( !changes.isEmpty() )
  {
    vlayer->beginEditCommand( tr( "Changed properties for label" ) + QStringLiteral( " '%1'" ).arg( currentLabelText( 24 ) ) );

    QgsAttributeMap::const_iterator changeIt = changes.constBegin();
    for ( ; changeIt != changes.constEnd(); ++changeIt )
    {
      vlayer->changeAttributeValue( mCurrentLabel.pos.featureId, changeIt.key(), changeIt.value() );
    }

    vlayer->endEditCommand();
    vlayer->triggerRepaint();
  }
}

void QgsGeometryValidationService::fixError( QgsGeometryCheckError *error, int method )
{
  QgsGeometryCheck::Changes changes;
  error->check()->fixError( mFeaturePools, error, method, QMap<QString, int>(), changes );
  error->setFixed( method );

  QgsFeaturePool *featurePool = mFeaturePools.value( error->layerId() );

  QgsVectorLayer *layer = nullptr;

  if ( featurePool )
    layer = featurePool->layer();
  else
  {
    // Some checks don't tell us on which layer they are because they are able to do cross-layer checks.
    // E.g. the gap check will report in such a way

    for ( auto layerCheck = mLayerChecks.constBegin(); layerCheck != mLayerChecks.constEnd(); ++layerCheck )
    {
      const QList<std::shared_ptr<QgsGeometryCheckError>> &topologyCheckErrors = layerCheck.value().topologyCheckErrors;
      for ( const auto &checkError : topologyCheckErrors )
      {
        if ( checkError.get() == error )
        {
          layer = layerCheck.key();
          break;
        }
      }
    }
  }

  if ( layer )
  {
    layer->triggerRepaint();

    emit topologyErrorUpdated( layer, error );
  }
}

void QgsMapToolRotateLabel::canvasReleaseEvent( QgsMapMouseEvent* e )
{
  Q_UNUSED( e );

  if ( !mLabelRubberBand ) //no rubber band created (most likely because the current label cannot be rotated )
  {
    return;
  }

  deleteRubberBands();
  delete mRotationItem;
  mRotationItem = nullptr;
  delete mRotationPreviewBox;
  mRotationPreviewBox = nullptr;

  QgsVectorLayer* vlayer = mCurrentLabel.layer;
  if ( !vlayer )
  {
    return;
  }

  int rotationCol;
  if ( !labelIsRotatable( vlayer, mCurrentLabel.settings, rotationCol ) )
  {
    return;
  }

  double rotation = mCtrlPressed ? roundTo15Degrees( mCurrentRotation ) : mCurrentRotation;
  if ( rotation == mStartRotation ) //mouse button pressed / released, but no rotation
  {
    return;
  }

  vlayer->beginEditCommand( tr( "Rotated label" ) + QString( " '%1'" ).arg( currentLabelText( 24 ) ) );
  vlayer->changeAttributeValue( mCurrentLabel.pos.featureId, rotationCol, rotation );
  vlayer->endEditCommand();
  vlayer->triggerRepaint();
}

//.........这里部分代码省略.........

      QgsCurve *curveToAdd = nullptr;
      if ( hasCurvedSegments && providerSupportsCurvedSegments )
      {
        curveToAdd = captureCurve()->clone();
      }
      else
      {
        curveToAdd = captureCurve()->curveToLine();
      }

      vlayer->beginEditCommand( tr( "Part added" ) );
      if ( mode() == CapturePolygon )
      {
        //avoid intersections
        QgsCurvePolygon *cp = new QgsCurvePolygon();
        cp->setExteriorRing( curveToAdd );
        QgsGeometry *geom = new QgsGeometry( cp );
        geom->avoidIntersections( QgsProject::instance()->avoidIntersectionsLayers() );

        const QgsCurvePolygon *cpGeom = qgsgeometry_cast<const QgsCurvePolygon *>( geom->constGet() );
        if ( !cpGeom )
        {
          stopCapturing();
          delete geom;
          vlayer->destroyEditCommand();
          return;
        }

        errorCode = vlayer->addPart( cpGeom->exteriorRing()->clone() );
        delete geom;
      }
      else
      {
        errorCode = vlayer->addPart( curveToAdd );
      }
      stopCapturing();
    }
    break;
    default:
      Q_ASSERT( !"invalid capture mode" );
      errorCode = 6;
      break;
  }

  QString errorMessage;
  switch ( errorCode )
  {
    case 0:
    {
      // remove previous message
      emit messageDiscarded();

      //add points to other features to keep topology up-to-date
      bool topologicalEditing = QgsProject::instance()->topologicalEditing();
      if ( topologicalEditing )
      {
        addTopologicalPoints( points() );
      }

      vlayer->endEditCommand();

      vlayer->triggerRepaint();

      if ( ( !isGeometryEmpty ) && QgsWkbTypes::isSingleType( vlayer->wkbType() ) )
      {
        emit messageEmitted( tr( "Add part: Feature geom is single part and you've added more than one" ), Qgis::Warning );
      }

      return;
    }

    case 1:
      errorMessage = tr( "Selected feature is not multi part." );
      break;

    case 2:
      errorMessage = tr( "New part's geometry is not valid." );
      break;

    case 3:
      errorMessage = tr( "New polygon ring not disjoint with existing polygons." );
      break;

    case 4:
      errorMessage = tr( "No feature selected. Please select a feature with the selection tool or in the attribute table" );
      break;

    case 5:
      errorMessage = tr( "Several features are selected. Please select only one feature to which an island should be added." );
      break;

    case 6:
      errorMessage = tr( "Selected geometry could not be found" );
      break;
  }

  emit messageEmitted( errorMessage, Qgis::Warning );
  vlayer->destroyEditCommand();
}

//.........这里部分代码省略.........
    {
      QgsFeature f( vlayer->fields(), 0 );

      QgsGeometry g;
      if ( layerWKBType == QgsWkbTypes::Point )
      {
        g = QgsGeometry::fromPoint( savePoint );
      }
      else if ( layerWKBType == QgsWkbTypes::Point25D )
      {
        g = QgsGeometry( new QgsPointV2( QgsWkbTypes::PointZ, savePoint.x(), savePoint.y(), 0.0 ) );
      }
      else if ( layerWKBType == QgsWkbTypes::MultiPoint )
      {
        g = QgsGeometry::fromMultiPoint( QgsMultiPoint() << savePoint );
      }
      else if ( layerWKBType == QgsWkbTypes::MultiPoint25D )
      {
        QgsMultiPointV2* mp = new QgsMultiPointV2();
        mp->addGeometry( new QgsPointV2( QgsWkbTypes::PointZ, savePoint.x(), savePoint.y(), 0.0 ) );
        g = QgsGeometry( mp );
      }
      else
      {
        // if layer supports more types (mCheckGeometryType is false)
        g = QgsGeometry::fromPoint( savePoint );
      }

      f.setGeometry( g );
      f.setValid( true );

      addFeature( vlayer, &f, false );

      vlayer->triggerRepaint();
    }
  }

  // LINE AND POLYGON CAPTURING
  else if ( mode() == CaptureLine || mode() == CapturePolygon )
  {
    //check we only use the line tool for line/multiline layers
    if ( mode() == CaptureLine && vlayer->geometryType() != QgsWkbTypes::LineGeometry && mCheckGeometryType )
    {
      emit messageEmitted( tr( "Wrong editing tool, cannot apply the 'capture line' tool on this vector layer" ), QgsMessageBar::WARNING );
      return;
    }

    //check we only use the polygon tool for polygon/multipolygon layers
    if ( mode() == CapturePolygon && vlayer->geometryType() != QgsWkbTypes::PolygonGeometry && mCheckGeometryType )
    {
      emit messageEmitted( tr( "Wrong editing tool, cannot apply the 'capture polygon' tool on this vector layer" ), QgsMessageBar::WARNING );
      return;
    }

    //add point to list and to rubber band
    if ( e->button() == Qt::LeftButton )
    {
      int error = addVertex( e->mapPoint(), e->mapPointMatch() );
      if ( error == 1 )
      {
        //current layer is not a vector layer
        return;
      }
      else if ( error == 2 )
      {
        //problem with coordinate transformation

//.........这里部分代码省略.........
        cadDockWidget()->clear();
        return;
      }

      mMovedFeatures.clear();
      mMovedFeatures << cf.id(); //todo: take the closest feature, not the first one...

      mRubberBand = createRubberBand( vlayer->geometryType() );
      mRubberBand->setToGeometry( cf.geometry(), vlayer );
    }
    else
    {
      mMovedFeatures = vlayer->selectedFeatureIds();

      mRubberBand = createRubberBand( vlayer->geometryType() );
      QgsFeature feat;
      QgsFeatureIterator it = vlayer->getSelectedFeatures( QgsFeatureRequest().setNoAttributes() );

      bool allFeaturesInView = true;
      QgsRectangle viewRect = mCanvas->mapSettings().mapToLayerCoordinates( vlayer, mCanvas->extent() );

      while ( it.nextFeature( feat ) )
      {
        mRubberBand->addGeometry( feat.geometry(), vlayer );

        if ( allFeaturesInView && !viewRect.intersects( feat.geometry().boundingBox() ) )
          allFeaturesInView = false;
      }

      if ( !allFeaturesInView )
      {
        // for extra safety to make sure we are not modifying geometries by accident

        int res = QMessageBox::warning( mCanvas, tr( "Move features" ),
                                        tr( "Some of the selected features are outside of the current map view. Would you still like to continue?" ),
                                        QMessageBox::Yes | QMessageBox::No );
        if ( res != QMessageBox::Yes )
        {
          mMovedFeatures.clear();
          delete mRubberBand;
          mRubberBand = nullptr;
          mSnapIndicator->setMatch( QgsPointLocator::Match() );
          return;
        }
      }
    }

    mStartPointMapCoords = e->mapPoint();
    mRubberBand->show();
  }
  else
  {
    // copy and move mode
    if ( e->button() != Qt::LeftButton )
    {
      cadDockWidget()->clear();
      delete mRubberBand;
      mRubberBand = nullptr;
      mSnapIndicator->setMatch( QgsPointLocator::Match() );
      return;
    }

    QgsPointXY startPointLayerCoords = toLayerCoordinates( ( QgsMapLayer * )vlayer, mStartPointMapCoords );
    QgsPointXY stopPointLayerCoords = toLayerCoordinates( ( QgsMapLayer * )vlayer, e->mapPoint() );

    double dx = stopPointLayerCoords.x() - startPointLayerCoords.x();
    double dy = stopPointLayerCoords.y() - startPointLayerCoords.y();

    vlayer->beginEditCommand( mMode == Move ? tr( "Feature moved" ) : tr( "Feature copied and moved" ) );

    switch ( mMode )
    {
      case Move:
        Q_FOREACH ( QgsFeatureId id, mMovedFeatures )
        {
          vlayer->translateFeature( id, dx, dy );
        }
        delete mRubberBand;
        mRubberBand = nullptr;
        mSnapIndicator->setMatch( QgsPointLocator::Match() );
        cadDockWidget()->clear();
        break;

      case CopyMove:
        QgsFeatureRequest request;
        request.setFilterFids( mMovedFeatures );
        QString *errorMsg = new QString();
        if ( !QgisApp::instance()->vectorLayerTools()->copyMoveFeatures( vlayer, request, dx, dy, errorMsg ) )
        {
          emit messageEmitted( *errorMsg, Qgis::Critical );
          delete mRubberBand;
          mRubberBand = nullptr;
          mSnapIndicator->setMatch( QgsPointLocator::Match() );
        }
        break;
    }

    vlayer->endEditCommand();
    vlayer->triggerRepaint();
  }

void QgsMapToolMoveLabel::canvasReleaseEvent( QgsMapMouseEvent *e )
{
  if ( !mLabelRubberBand )
  {
    return;
  }

  deleteRubberBands();

  QgsVectorLayer *vlayer = mCurrentLabel.layer;
  if ( !vlayer )
  {
    return;
  }

  QgsPointXY releaseCoords = toMapCoordinates( e->pos() );
  double xdiff = releaseCoords.x() - mStartPointMapCoords.x();
  double ydiff = releaseCoords.y() - mStartPointMapCoords.y();

  int xCol, yCol;
  double xPosOrig, yPosOrig;
  bool xSuccess, ySuccess;

  if ( !currentLabelDataDefinedPosition( xPosOrig, xSuccess, yPosOrig, ySuccess, xCol, yCol ) )
  {
    return;
  }

  double xPosNew, yPosNew;

  if ( !xSuccess || !ySuccess )
  {
    xPosNew = releaseCoords.x() - mClickOffsetX;
    yPosNew = releaseCoords.y() - mClickOffsetY;
  }
  else
  {
    //transform to map crs first, because xdiff,ydiff are in map coordinates
    const QgsMapSettings &ms = mCanvas->mapSettings();
    QgsPointXY transformedPoint = ms.layerToMapCoordinates( vlayer, QgsPointXY( xPosOrig, yPosOrig ) );
    xPosOrig = transformedPoint.x();
    yPosOrig = transformedPoint.y();
    xPosNew = xPosOrig + xdiff;
    yPosNew = yPosOrig + ydiff;
  }

  //transform back to layer crs
  if ( mCanvas )
  {
    const QgsMapSettings &s = mCanvas->mapSettings();
    QgsPointXY transformedPoint = s.mapToLayerCoordinates( vlayer, QgsPointXY( xPosNew, yPosNew ) );
    xPosNew = transformedPoint.x();
    yPosNew = transformedPoint.y();
  }

  vlayer->beginEditCommand( tr( "Moved label" ) + QStringLiteral( " '%1'" ).arg( currentLabelText( 24 ) ) );
  vlayer->changeAttributeValue( mCurrentLabel.pos.featureId, xCol, xPosNew );
  vlayer->changeAttributeValue( mCurrentLabel.pos.featureId, yCol, yPosNew );

  // set rotation to that of label, if data-defined and no rotation set yet
  // honor whether to preserve preexisting data on pin
  // must come after setting x and y positions
  if ( !mCurrentLabel.pos.isDiagram
       && !mCurrentLabel.pos.isPinned
       && !currentLabelPreserveRotation() )
  {
    double defRot;
    bool rSuccess;
    int rCol;
    if ( currentLabelDataDefinedRotation( defRot, rSuccess, rCol ) )
    {
      double labelRot = mCurrentLabel.pos.rotation * 180 / M_PI;
      vlayer->changeAttributeValue( mCurrentLabel.pos.featureId, rCol, labelRot );
    }
  }
  vlayer->endEditCommand();

  vlayer->triggerRepaint();
}