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# Source code for camelot.view.controls.field_label

    #  ============================================================================
    #
    #  Copyright (C) 2007-2011 Conceptive Engineering bvba. All rights reserved.
    #  www.conceptive.be / project-camelot@conceptive.be
    #
    #  This file is part of the Camelot Library.
    #
    #  This file may be used under the terms of the GNU General Public
    #  License version 2.0 as published by the Free Software Foundation
    #  and appearing in the file license.txt included in the packaging of
    #  this file.  Please review this information to ensure GNU
    #  General Public Licensing requirements will be met.
    #
    #  If you are unsure which license is appropriate for your use, please
    #  visit www.python-camelot.com or contact project-camelot@conceptive.be
    #
    #  This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
    #  WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
    #
    #  For use of this library in commercial applications, please contact
    #  project-camelot@conceptive.be
    #
    #  ============================================================================
    from PyQt4 import QtGui, QtCore
    from PyQt4.QtCore import Qt

    from camelot.core.utils import ugettext as _
    from camelot.admin.object_admin import ObjectAdmin
    from camelot.view.controls.editors.one2manyeditor import One2ManyEditor
    from user_translatable_label import UserTranslatableLabel

    class Attribute(object):
        """Helper class representing a field attribute's name and its value"""
        def __init__(self, name, value):
            self.name = unicode(name)
            self.value = unicode(value)

        class Admin(ObjectAdmin):
            list_display = ['name', 'value']
            field_attributes = {'name':{'minimal_column_width':25},
                                'value':{'minimal_column_width':25}}

    class FieldLabel(UserTranslatableLabel):
        """A Label widget used to display the name of a field on a form.
        This label provides the user with the possibility to change the translation
        of the label and review its field attributes.
        """

        font_width = None

        def __init__(self, field_name, text, field_attributes, admin, parent=None):
            """
            :param field_name: the name of the field
            :param text: user translatable string to be used as field label
            :param field_attributes: the field attributes associated with the field for which
            this is a label
            :param admin: the admin of the object of the field
            """
            super(FieldLabel, self).__init__(text, parent)
            if FieldLabel.font_width == None:
                FieldLabel.font_width = QtGui.QFontMetrics( QtGui.QApplication.font() ).size( Qt.TextSingleLine, 'A' ).width()
            show_field_attributes_action = QtGui.QAction(_('View attributes'), self)
            show_field_attributes_action.triggered.connect( self.show_field_attributes )
            self.addAction(show_field_attributes_action)
            self._field_name = field_name
            self._admin = admin
            self._field_attributes = field_attributes

        def sizeHint( self ):
            size_hint = super(FieldLabel, self).sizeHint()
            size_hint.setWidth( self.font_width * max( 20, len( self._field_name ) ) )
            return size_hint

        def get_attributes(self):
            import inspect

            def attribute_value_to_string(key, value):
                if inspect.isclass(value):
                    return value.__name__
                return unicode(value)

            return [Attribute(key,attribute_value_to_string(key, value)) for key,value in self._field_attributes.items()]

        @QtCore.pyqtSlot()
        def show_field_attributes(self):
            from camelot.view.proxy.collection_proxy import CollectionProxy

            admin = self._admin.get_related_entity_admin(Attribute)
            attributes_collection = CollectionProxy(admin=admin,
                                                    collection_getter=self.get_attributes,
                                                    columns_getter=admin.get_columns)

            class FieldAttributesDialog(QtGui.QDialog):

                def __init__(self, field_name, parent=None):
                    super(FieldAttributesDialog, self).__init__(parent)
                    self.setWindowTitle(_('Field Attributes'))
                    layout = QtGui.QVBoxLayout()
                    layout.addWidget( QtGui.QLabel(field_name) )
                    editor = One2ManyEditor(admin=admin, editable=False, parent=self)
                    editor.set_value(attributes_collection)
                    editor.setMinimumSize(600, 400)
                    layout.addWidget(editor)
                    self.setLayout(layout)

            dialog = FieldAttributesDialog(self._field_name, self)
            dialog.exec_()

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