当前位置: 首页>>代码示例>>C++>>正文

C++ SymbolLayerItem::updatePreview方法代码示例

本文整理汇总了C++中SymbolLayerItem::updatePreview方法的典型用法代码示例。如果您正苦于以下问题：C++ SymbolLayerItem::updatePreview方法的具体用法？C++ SymbolLayerItem::updatePreview怎么用？C++ SymbolLayerItem::updatePreview使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类SymbolLayerItem的用法示例。


在下文中一共展示了SymbolLayerItem::updatePreview方法的9个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。

示例1: symbolChanged

void QgsSymbolSelectorWidget::symbolChanged()
{
  SymbolLayerItem *currentItem = static_cast<SymbolLayerItem *>( model->itemFromIndex( layersTree->currentIndex() ) );
  if ( !currentItem || currentItem->isLayer() )
    return;
  // disconnect to avoid recreating widget
  disconnect( layersTree->selectionModel(), &QItemSelectionModel::currentChanged, this, &QgsSymbolSelectorWidget::layerChanged );
  if ( currentItem->parent() )
  {
    // it is a sub-symbol
    QgsSymbol *symbol = currentItem->symbol();
    SymbolLayerItem *parent = static_cast<SymbolLayerItem *>( currentItem->parent() );
    parent->removeRow( 0 );
    loadSymbol( symbol, parent );
    layersTree->setCurrentIndex( parent->child( 0 )->index() );
    parent->updatePreview();
  }
  else
  {
    //it is the symbol itself
    loadSymbol();
    QModelIndex newIndex = layersTree->model()->index( 0, 0 );
    layersTree->setCurrentIndex( newIndex );
  }
  updatePreview();
  // connect it back once things are set
  connect( layersTree->selectionModel(), &QItemSelectionModel::currentChanged, this, &QgsSymbolSelectorWidget::layerChanged );
}
开发者ID:dbaston，项目名称:QGIS，代码行数:28，代码来源:qgssymbolselectordialog.cpp

示例2: changeLayer

void QgsSymbolSelectorWidget::changeLayer( QgsSymbolLayer *newLayer )
{
  SymbolLayerItem *item = currentLayerItem();
  QgsSymbolLayer *layer = item->layer();

  if ( layer->subSymbol() )
  {
    item->removeRow( 0 );
  }
  // update symbol layer item
  item->setLayer( newLayer );
  // When it is a marker symbol
  if ( newLayer->subSymbol() )
  {
    loadSymbol( newLayer->subSymbol(), item );
    layersTree->setExpanded( item->index(), true );
  }

  // Change the symbol at last to avoid deleting item's layer
  QgsSymbol *symbol = static_cast<SymbolLayerItem *>( item->parent() )->symbol();
  int layerIdx = item->parent()->rowCount() - item->row() - 1;
  symbol->changeSymbolLayer( layerIdx, newLayer );

  item->updatePreview();
  updatePreview();
  // Important: This lets the layer have its own layer properties widget
  layerChanged();
}
开发者ID:dbaston，项目名称:QGIS，代码行数:28，代码来源:qgssymbolselectordialog.cpp

示例3: moveLayerByOffset

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();
}
开发者ID:dbaston，项目名称:QGIS，代码行数:25，代码来源:qgssymbolselectordialog.cpp

示例4: currentLayer

void QgsSymbolV2PropertiesDialog::layerTypeChanged()
{
  QgsSymbolLayerV2* layer = currentLayer();
  if ( layer == NULL ) return;

  QString newLayerType = cboLayerType->itemData( cboLayerType->currentIndex() ).toString();
  if ( layer->layerType() == newLayerType )
    return;

  // get creation function for new layer from registry
  QgsSymbolLayerV2Registry* pReg = QgsSymbolLayerV2Registry::instance();
  QgsSymbolLayerV2AbstractMetadata* am = pReg->symbolLayerMetadata( newLayerType );
  if ( am == NULL ) // check whether the metadata is assigned
    return;

  // change layer to a new (with different type)
  QgsSymbolLayerV2* newLayer = am->createSymbolLayer( QgsStringMap() );
  if ( newLayer == NULL )
    return;
  mSymbol->changeSymbolLayer( currentLayerIndex(), newLayer );

  updateSymbolLayerWidget( newLayer );

  // update symbol layer item
  SymbolLayerItem* item = currentLayerItem();
  item->setLayer( newLayer );
  item->updatePreview();

  updatePreview();
}
开发者ID:mmubangizi，项目名称:qgis，代码行数:30，代码来源:qgssymbolv2propertiesdialog.cpp

示例5: updateLayerPreview

void QgsSymbolSelectorWidget::updateLayerPreview()
{
  // get current layer item and update its icon
  SymbolLayerItem *item = currentLayerItem();
  if ( item )
    item->updatePreview();
  // update also preview of the whole symbol
  updatePreview();
}
开发者ID:dbaston，项目名称:QGIS，代码行数:9，代码来源:qgssymbolselectordialog.cpp

示例6: currentLayerItem

void QgsSymbolV2PropertiesDialog::updateLayerPreview()
{
  // get current layer item and update its icon
  SymbolLayerItem* item = currentLayerItem();
  if ( item )
    item->updatePreview();

  // update also preview of the whole symbol
  updatePreview();
}
开发者ID:mmubangizi，项目名称:qgis，代码行数:10，代码来源:qgssymbolv2propertiesdialog.cpp

示例7: addLayer

void QgsSymbolSelectorWidget::addLayer()
{
  QModelIndex idx = layersTree->currentIndex();
  if ( !idx.isValid() )
    return;

  int insertIdx = -1;
  SymbolLayerItem *item = static_cast<SymbolLayerItem *>( model->itemFromIndex( idx ) );
  if ( item->isLayer() )
  {
    insertIdx = item->row();
    item = static_cast<SymbolLayerItem *>( item->parent() );
  }

  QgsSymbol *parentSymbol = item->symbol();

  // save data-defined values at marker level
  QgsProperty ddSize( parentSymbol->type() == QgsSymbol::Marker
                      ? static_cast<QgsMarkerSymbol *>( parentSymbol )->dataDefinedSize()
                      : QgsProperty() );
  QgsProperty ddAngle( parentSymbol->type() == QgsSymbol::Marker
                       ? static_cast<QgsMarkerSymbol *>( parentSymbol )->dataDefinedAngle()
                       : QgsProperty() );
  QgsProperty ddWidth( parentSymbol->type() == QgsSymbol::Line
                       ? static_cast<QgsLineSymbol *>( parentSymbol )->dataDefinedWidth()
                       : QgsProperty() );

  QgsSymbolLayer *newLayer = QgsApplication::symbolLayerRegistry()->defaultSymbolLayer( parentSymbol->type() );
  if ( insertIdx == -1 )
    parentSymbol->appendSymbolLayer( newLayer );
  else
    parentSymbol->insertSymbolLayer( item->rowCount() - insertIdx, newLayer );

  // restore data-defined values at marker level
  if ( ddSize )
    static_cast<QgsMarkerSymbol *>( parentSymbol )->setDataDefinedSize( ddSize );
  if ( ddAngle )
    static_cast<QgsMarkerSymbol *>( parentSymbol )->setDataDefinedAngle( ddAngle );
  if ( ddWidth )
    static_cast<QgsLineSymbol *>( parentSymbol )->setDataDefinedWidth( ddWidth );

  SymbolLayerItem *newLayerItem = new SymbolLayerItem( newLayer );
  item->insertRow( insertIdx == -1 ? 0 : insertIdx, newLayerItem );
  item->updatePreview();

  layersTree->setCurrentIndex( model->indexFromItem( newLayerItem ) );
  updateUi();
  updatePreview();
}
开发者ID:dbaston，项目名称:QGIS，代码行数:49，代码来源:qgssymbolselectordialog.cpp

示例8: removeLayer

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;
}
开发者ID:dbaston，项目名称:QGIS，代码行数:21，代码来源:qgssymbolselectordialog.cpp

示例9: duplicateLayer

void QgsSymbolSelectorWidget::duplicateLayer()
{
  QModelIndex idx = layersTree->currentIndex();
  if ( !idx.isValid() )
    return;

  SymbolLayerItem *item = static_cast<SymbolLayerItem *>( model->itemFromIndex( idx ) );
  if ( !item->isLayer() )
    return;

  QgsSymbolLayer *source = item->layer();

  int insertIdx = item->row();
  item = static_cast<SymbolLayerItem *>( item->parent() );

  QgsSymbol *parentSymbol = item->symbol();

  QgsSymbolLayer *newLayer = source->clone();
  if ( insertIdx == -1 )
    parentSymbol->appendSymbolLayer( newLayer );
  else
    parentSymbol->insertSymbolLayer( item->rowCount() - insertIdx, newLayer );

  SymbolLayerItem *newLayerItem = new SymbolLayerItem( newLayer );
  item->insertRow( insertIdx == -1 ? 0 : insertIdx, newLayerItem );
  if ( newLayer->subSymbol() )
  {
    loadSymbol( newLayer->subSymbol(), newLayerItem );
    layersTree->setExpanded( newLayerItem->index(), true );
  }
  item->updatePreview();

  layersTree->setCurrentIndex( model->indexFromItem( newLayerItem ) );
  updateUi();
  updatePreview();
}
开发者ID:dbaston，项目名称:QGIS，代码行数:36，代码来源:qgssymbolselectordialog.cpp


注：本文中的SymbolLayerItem::updatePreview方法示例由纯净天空整理自Github/MSDocs等开源代码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。