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

QString QgsMapToolLabel::currentLabelText( int trunc )
{
  bool settingsOk;
  QgsPalLayerSettings& labelSettings = currentLabelSettings( &settingsOk );
  if ( !settingsOk )
  {
    return "";
  }

  if ( labelSettings.isExpression )
  {
    QString labelText = mCurrentLabelPos.labelText;

    if ( trunc > 0 && labelText.length() > trunc )
    {
      labelText.truncate( trunc );
      labelText += "...";
    }
    return labelText;
  }
  else
  {
    QgsVectorLayer* vlayer = currentLayer();
    if ( !vlayer )
    {
      return "";
    }

    QString labelField = vlayer->customProperty( "labeling/fieldName" ).toString();
    if ( !labelField.isEmpty() )
    {
      int labelFieldId = vlayer->fieldNameIndex( labelField );
      QgsFeature f;
      if ( vlayer->getFeatures( QgsFeatureRequest().setFilterFid( mCurrentLabelPos.featureId ).setFlags( QgsFeatureRequest::NoGeometry ) ).nextFeature( f ) )
      {
        QString labelText = f.attribute( labelFieldId ).toString();
        if ( trunc > 0 && labelText.length() > trunc )
        {
          labelText.truncate( trunc );
          labelText += "...";
        }
        return labelText;
      }
    }
  }
  return "";
}

QString QgsMapToolLabel::currentLabelText( int trunc )
{
  if ( !mCurrentLabel.valid )
  {
    return QLatin1String( "" );
  }
  QgsPalLayerSettings& labelSettings = mCurrentLabel.settings;

  if ( labelSettings.isExpression )
  {
    QString labelText = mCurrentLabel.pos.labelText;

    if ( trunc > 0 && labelText.length() > trunc )
    {
      labelText.truncate( trunc );
      labelText += QLatin1String( "..." );
    }
    return labelText;
  }
  else
  {
    QgsVectorLayer* vlayer = mCurrentLabel.layer;
    if ( !vlayer )
    {
      return QLatin1String( "" );
    }

    QString labelField = vlayer->customProperty( QStringLiteral( "labeling/fieldName" ) ).toString();
    if ( !labelField.isEmpty() )
    {
      int labelFieldId = vlayer->fields().lookupField( labelField );
      QgsFeature f;
      if ( vlayer->getFeatures( QgsFeatureRequest().setFilterFid( mCurrentLabel.pos.featureId ).setFlags( QgsFeatureRequest::NoGeometry ) ).nextFeature( f ) )
      {
        QString labelText = f.attribute( labelFieldId ).toString();
        if ( trunc > 0 && labelText.length() > trunc )
        {
          labelText.truncate( trunc );
          labelText += QLatin1String( "..." );
        }
        return labelText;
      }
    }
  }
  return QLatin1String( "" );
}

QString QgsMapToolLabel::currentLabelText()
{
    QgsVectorLayer* vlayer = currentLayer();
    if ( !vlayer )
    {
        return "";
    }

    QString labelField = vlayer->customProperty( "labeling/fieldName" ).toString();
    if ( !labelField.isEmpty() )
    {
        int labelFieldId = vlayer->fieldNameIndex( labelField );
        QgsFeature f;
        if ( vlayer->featureAtId( mCurrentLabelPos.featureId, f, false, true ) )
        {
            return f.attributeMap()[labelFieldId].toString();
        }
    }
    return "";
}

void QgsLabelPropertyDialog::init( const QString& layerId, int featureId )
{
  if ( !mMapRenderer )
  {
    return;
  }

  //get feature attributes
  QgsVectorLayer* vlayer = dynamic_cast<QgsVectorLayer*>( QgsMapLayerRegistry::instance()->mapLayer( layerId ) );
  if ( !vlayer )
  {
    return;
  }

  QgsFeature f;
  if ( !vlayer->featureAtId( featureId, f, false, true ) )
  {
    return;
  }
  const QgsAttributeMap& attributeValues = f.attributeMap();

  //get layerproperties. Problem: only for pallabeling...
  QgsPalLabeling* lbl = dynamic_cast<QgsPalLabeling*>( mMapRenderer->labelingEngine() );
  if ( !lbl )
  {
    return;
  }

  blockElementSignals( true );

  //get label field and fill line edit
  QString labelFieldName = vlayer->customProperty( "labeling/fieldName" ).toString();
  if ( !labelFieldName.isEmpty() )
  {
    mCurrentLabelField = vlayer->fieldNameIndex( labelFieldName );
    mLabelTextLineEdit->setText( attributeValues[mCurrentLabelField].toString() );
    const QgsFieldMap& layerFields = vlayer->pendingFields();
    switch ( layerFields[mCurrentLabelField].type() )
    {
      case QVariant::Double:
        mLabelTextLineEdit->setValidator( new QDoubleValidator( this ) );
        break;
      case QVariant::Int:
      case QVariant::UInt:
      case QVariant::LongLong:
        mLabelTextLineEdit->setValidator( new QIntValidator( this ) );
        break;
      default:
        break;
    }
  }

  //get attributes of the feature and fill data defined values
  QgsPalLayerSettings& layerSettings = lbl->layer( layerId );
  mLabelFont = layerSettings.textFont;

  //set all the gui elements to the default values
  mFontSizeSpinBox->setValue( layerSettings.textFont.pointSizeF() );
  mBufferColorButton->setColor( layerSettings.textColor );
  mLabelDistanceSpinBox->setValue( layerSettings.dist );
  mBufferSizeSpinBox->setValue( layerSettings.bufferSize );
  mMinScaleSpinBox->setValue( layerSettings.scaleMin );
  mMaxScaleSpinBox->setValue( layerSettings.scaleMax );
  mHaliComboBox->setCurrentIndex( mHaliComboBox->findText( "Left" ) );
  mValiComboBox->setCurrentIndex( mValiComboBox->findText( "Bottom" ) );

  disableGuiElements();

  mDataDefinedProperties = layerSettings.dataDefinedProperties;
  QMap< QgsPalLayerSettings::DataDefinedProperties, int >::const_iterator propIt = mDataDefinedProperties.constBegin();

  for ( ; propIt != mDataDefinedProperties.constEnd(); ++propIt )
  {
    switch ( propIt.key() )
    {
      case QgsPalLayerSettings::Show:
        mShowLabelChkbx->setEnabled( true );
        mShowLabelChkbx->setChecked( attributeValues[propIt.value()].toInt() != 0 );
        break;
      case QgsPalLayerSettings::AlwaysShow:
        mAlwaysShowChkbx->setEnabled( true );
        mAlwaysShowChkbx->setChecked( attributeValues[propIt.value()].toBool() );
        break;
      case QgsPalLayerSettings::MinScale:
        mMinScaleSpinBox->setEnabled( true );
        mMinScaleSpinBox->setValue( attributeValues[propIt.value()].toInt() );
        break;
      case QgsPalLayerSettings::MaxScale:
        mMaxScaleSpinBox->setEnabled( true );
        mMaxScaleSpinBox->setValue( attributeValues[propIt.value()].toInt() );
        break;
      case QgsPalLayerSettings::Size:
        mFontSizeSpinBox->setEnabled( true );
        mLabelFont.setPointSizeF( attributeValues[propIt.value()].toDouble() );
        mFontSizeSpinBox->setValue( attributeValues[propIt.value()].toDouble() );
        break;
      case QgsPalLayerSettings::BufferSize:
        mBufferSizeSpinBox->setEnabled( true );
        mBufferSizeSpinBox->setValue( attributeValues[propIt.value()].toDouble() );
        break;
//.........这里部分代码省略.........

void QgsLabelPropertyDialog::init( const QString& layerId, const QString& providerId, int featureId, const QString& labelText )
{
  //get feature attributes
  QgsVectorLayer* vlayer = dynamic_cast<QgsVectorLayer*>( QgsMapLayerRegistry::instance()->mapLayer( layerId ) );
  if ( !vlayer )
  {
    return;
  }
  if ( !vlayer->labeling() )
  {
    return;
  }

  if ( !vlayer->getFeatures( QgsFeatureRequest().setFilterFid( featureId ).setFlags( QgsFeatureRequest::NoGeometry ) ).nextFeature( mCurLabelFeat ) )
  {
    return;
  }
  QgsAttributes attributeValues = mCurLabelFeat.attributes();

  //get layerproperties. Problem: only for pallabeling...

  blockElementSignals( true );

  QgsPalLayerSettings layerSettings = vlayer->labeling()->settings( vlayer, providerId );

  //get label field and fill line edit
  if ( layerSettings.isExpression && !labelText.isNull() )
  {
    mLabelTextLineEdit->setText( labelText );
    mLabelTextLineEdit->setEnabled( false );
    mLabelTextLabel->setText( tr( "Expression result" ) );
  }
  else
  {
    QString labelFieldName = vlayer->customProperty( "labeling/fieldName" ).toString();
    if ( !labelFieldName.isEmpty() )
    {
      mCurLabelField = vlayer->fieldNameIndex( labelFieldName );
      if ( mCurLabelField >= 0 )
      {
        mLabelTextLineEdit->setText( attributeValues.at( mCurLabelField ).toString() );
        const QgsFields& layerFields = vlayer->fields();
        switch ( layerFields.at( mCurLabelField ).type() )
        {
          case QVariant::Double:
            mLabelTextLineEdit->setValidator( new QDoubleValidator( this ) );
            break;
          case QVariant::Int:
          case QVariant::UInt:
          case QVariant::LongLong:
            mLabelTextLineEdit->setValidator( new QIntValidator( this ) );
            break;
          default:
            break;
        }
      }
      else
      {
        mLabelTextLineEdit->setEnabled( false );
      }
    }
  }

  //get attributes of the feature and fill data defined values

  // font is set directly from QgsLabelPosition
  updateFont( mLabelFont, false );

  //set all the gui elements to the default layer-level values
  mLabelDistanceSpinBox->clear();
  mLabelDistanceSpinBox->setSpecialValueText( tr( "Layer default (%1)" ).arg( QString::number( layerSettings.dist, 'f', mLabelDistanceSpinBox->decimals() ) ) );
  mBufferSizeSpinBox->clear();
  mBufferSizeSpinBox->setSpecialValueText( tr( "Layer default (%1)" ).arg( QString::number( layerSettings.bufferSize, 'f', mBufferSizeSpinBox->decimals() ) ) );
  mRotationSpinBox->clear();
  mXCoordSpinBox->clear();
  mYCoordSpinBox->clear();

  mShowLabelChkbx->setChecked( true );
  mFontColorButton->setColor( layerSettings.textColor );
  mBufferColorButton->setColor( layerSettings.bufferColor );
  mMinScaleSpinBox->setValue( layerSettings.scaleMin );
  mMaxScaleSpinBox->setValue( layerSettings.scaleMax );
  mHaliComboBox->setCurrentIndex( mHaliComboBox->findData( "Left" ) );
  mValiComboBox->setCurrentIndex( mValiComboBox->findData( "Bottom" ) );
  mFontColorButton->setColorDialogTitle( tr( "Font color" ) );
  mBufferColorButton->setColorDialogTitle( tr( "Buffer color" ) );

  disableGuiElements();

  QMap< QgsPalLayerSettings::DataDefinedProperties, QgsDataDefined* >::const_iterator it = layerSettings.dataDefinedProperties.constBegin();
  for ( ; it != layerSettings.dataDefinedProperties.constEnd(); ++it )
  {
    mDataDefinedProperties.insert( it.key(), it.value() ? new QgsDataDefined( *it.value() ) : nullptr );
  }

  //set widget values from data defined results
  setDataDefinedValues( layerSettings, vlayer );
  //enable widgets connected to data defined fields
  enableDataDefinedWidgets( vlayer );

//.........这里部分代码省略.........