C++ (Cpp) QgsSymbol::takeSymbolLayer示例

void QgsSymbolSelectorWidget::moveLayerByOffset( int offset )
{
  SymbolLayerItem *item = currentLayerItem();
  if ( !item )
    return;
  int row = item->row();

  SymbolLayerItem *parent = static_cast<SymbolLayerItem *>( item->parent() );
  QgsSymbol *parentSymbol = parent->symbol();

  int layerIdx = parent->rowCount() - row - 1;
  // switch layers
  QgsSymbolLayer *tmpLayer = parentSymbol->takeSymbolLayer( layerIdx );
  parentSymbol->insertSymbolLayer( layerIdx - offset, tmpLayer );

  QList<QStandardItem *> rowItems = parent->takeRow( row );
  parent->insertRows( row + offset, rowItems );
  parent->updatePreview();

  QModelIndex newIdx = rowItems[ 0 ]->index();
  layersTree->setCurrentIndex( newIdx );

  updatePreview();
  updateUi();
}

示例#2

显示文件

文件： qgssymbolselectordialog.cpp 项目： dbaston/QGIS

void QgsSymbolSelectorWidget::removeLayer()
{
  SymbolLayerItem *item = currentLayerItem();
  int row = item->row();
  SymbolLayerItem *parent = static_cast<SymbolLayerItem *>( item->parent() );

  int layerIdx = parent->rowCount() - row - 1; // IMPORTANT
  QgsSymbol *parentSymbol = parent->symbol();
  QgsSymbolLayer *tmpLayer = parentSymbol->takeSymbolLayer( layerIdx );

  parent->removeRow( row );
  parent->updatePreview();

  QModelIndex newIdx = parent->child( 0 )->index();
  layersTree->setCurrentIndex( newIdx );

  updateUi();
  updatePreview();
  //finally delete the removed layer pointer
  delete tmpLayer;
}