Source code for camelot.view.controls.delegates.floatdelegate

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import six

from ....core.qt import variant_to_py, Qt, QtCore
from .customdelegate import CustomDelegate, DocumentationMetaclass
from camelot.view.controls import editors
from camelot.core import constants
from camelot.view.proxy import ValueLoading

@six.add_metaclass(DocumentationMetaclass)
[docs]class FloatDelegate(CustomDelegate):
    """Custom delegate for float values"""

    editor = editors.FloatEditor

    def __init__( self,
                 minimum=constants.camelot_minfloat,
                 maximum=constants.camelot_maxfloat,
                 parent=None,
                 unicode_format=None,
                 **kwargs ):
        super(FloatDelegate, self).__init__(parent=parent,
                                            minimum=minimum, maximum=maximum,
                                            **kwargs )
        self.minimum = minimum
        self.maximum = maximum
        self.unicode_format = unicode_format
        self._locale = QtCore.QLocale()

    def paint( self, painter, option, index ):
        painter.save()
        self.drawBackground(painter, option, index)
        value = variant_to_py(index.model().data(index, Qt.EditRole))
        field_attributes = variant_to_py( index.model().data( index, Qt.UserRole ) )

        if field_attributes == ValueLoading:
            precision = 2
        else:
            precision = field_attributes.get('precision', 2)
            
        if value in (None, ValueLoading):
            value_str = ''
        elif self.unicode_format:
            value_str = self.unicode_format(value)
        else:
            value_str = six.text_type( self._locale.toString( float(value), 
                                                        'f', 
                                                        precision ) )

        self.paint_text( painter, option, index, value_str, horizontal_align=Qt.AlignRight )
        painter.restore()