C++ (Cpp) showHideLabel Examples

Example #1

File: qgsmaptoolshowhidelabels.cpp Project: tomyun/Quantum-GIS

void QgsMapToolShowHideLabels::showHideLabels( QMouseEvent * e )
{

  if ( !mCanvas || mCanvas->isDrawing() )
  {
    QgsDebugMsg( "Canvas not ready" );
    return;
  }

  mRender = mCanvas->mapRenderer();
  if ( !mRender )
  {
    QgsDebugMsg( "Failed to acquire map renderer" );
    return;
  }

  QgsMapLayer* layer = mCanvas->currentLayer();

  QgsVectorLayer* vlayer = dynamic_cast<QgsVectorLayer*>( layer );
  if ( !vlayer )
  {
    QgsDebugMsg( "Failed to cast label layer to vector layer" );
    return;
  }
  if ( !vlayer->isEditable() )
  {
    QgsDebugMsg( "Vector layer not editable, skipping label" );
    return;
  }

  bool doHide = e->modifiers() & Qt::ShiftModifier ? true : false;

  QgsFeatureIds selectedFeatIds;

  if ( !doHide )
  {
    QgsDebugMsg( "Showing labels operation" );

    if ( !selectedFeatures( vlayer, selectedFeatIds ) )
    {
      return;
    }
  }
  else
  {
    QgsDebugMsg( "Hiding labels operation" );

    if ( !selectedLabelFeatures( vlayer, selectedFeatIds ) )
    {
      return;
    }
  }

  QgsDebugMsg( "Number of selected labels or features: " + QString::number( selectedFeatIds.size() ) );


  bool labelChanged = false;

  foreach ( const QgsFeatureId &fid, selectedFeatIds )
  {
    if ( showHideLabel( vlayer, fid, doHide ) )
    {
      // TODO: highlight features (maybe with QTimer?)
      labelChanged = true;
    }
  }

  if ( labelChanged )
  {
    mCanvas->refresh();
  }
}

Example #2

File: qgsmaptoolshowhidelabels.cpp Project: chhao91/QGIS

void QgsMapToolShowHideLabels::showHideLabels( QMouseEvent * e )
{
  QgsMapLayer* layer = mCanvas->currentLayer();

  QgsVectorLayer* vlayer = dynamic_cast<QgsVectorLayer*>( layer );
  if ( !vlayer )
  {
    QgsDebugMsg( "Failed to cast label layer to vector layer" );
    return;
  }
  if ( !vlayer->isEditable() )
  {
    QgsDebugMsg( "Vector layer not editable, skipping label" );
    return;
  }

  bool doHide = e->modifiers() & Qt::ShiftModifier ? true : false;

  QgsFeatureIds selectedFeatIds;

  if ( !doHide )
  {
    QgsDebugMsg( "Showing labels operation" );

    if ( !selectedFeatures( vlayer, selectedFeatIds ) )
    {
      return;
    }
  }
  else
  {
    QgsDebugMsg( "Hiding labels operation" );

    if ( !selectedLabelFeatures( vlayer, selectedFeatIds ) )
    {
      return;
    }
  }

  QgsDebugMsg( "Number of selected labels or features: " + QString::number( selectedFeatIds.size() ) );

  if ( selectedFeatIds.isEmpty() )
  {
    return;
  }

  bool labelChanged = false;
  QString editTxt = doHide ? tr( "Hid labels" ) : tr( "Showed labels" );

  vlayer->beginEditCommand( editTxt );
  Q_FOREACH ( const QgsFeatureId &fid, selectedFeatIds )
  {
    if ( showHideLabel( vlayer, fid, doHide ) )
    {
      // TODO: highlight features (maybe with QTimer?)
      labelChanged = true;
    }
  }

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