Esempi in C++ (Cpp) per QgsPaintEffect::properties

Esempio n. 1

File: qgspainteffectpropertieswidget.cpp Progetto: wongjimsan/QGIS

void QgsPaintEffectPropertiesWidget::effectTypeChanged()
{
  QgsPaintEffect* effect = mEffect;
  if ( !effect )
    return;

  QString newEffectType = mEffectTypeCombo->currentData().toString();
  if ( effect->type() == newEffectType )
    return;

  // get creation function for new effect from registry
  QgsPaintEffectRegistry* registry = QgsApplication::paintEffectRegistry();
  QgsPaintEffectAbstractMetadata* am = registry->effectMetadata( newEffectType );
  if ( !am ) // check whether the metadata is assigned
    return;

  // change effect to a new (with different type)
  // base new effect on existing effect's properties
  QgsPaintEffect* newEffect = am->createPaintEffect( effect->properties() );
  if ( !newEffect )
    return;

  updateEffectWidget( newEffect );
  emit changeEffect( newEffect );

  mEffect = newEffect;
}