Documents: Split monolith forms.py

Split the documents/forms.py into sub modules for each logical
unit: types, document, pages, versions.

Signed-off-by: Roberto Rosario <Roberto.Rosario@mayan-edms.com>

mayan/apps/documents/forms/document_page_forms.py

@@ -0,0 +1,40 @@
+from __future__ import absolute_import, unicode_literals
+
+import logging
+
+from django import forms
+from django.utils.translation import ugettext_lazy as _
+
+from ..fields import DocumentPageField
+
+__all__ = ('DocumentPageForm', 'DocumentPageNumberForm')
+logger = logging.getLogger(__name__)
+
+
+class DocumentPageForm(forms.Form):
+    document_page = DocumentPageField()
+
+    def __init__(self, *args, **kwargs):
+        instance = kwargs.pop('instance', None)
+        rotation = kwargs.pop('rotation', None)
+        zoom = kwargs.pop('zoom', None)
+        super(DocumentPageForm, self).__init__(*args, **kwargs)
+        self.fields['document_page'].initial = instance
+        self.fields['document_page'].widget.attrs.update({
+            'zoom': zoom,
+            'rotation': rotation,
+        })
+
+
+class DocumentPageNumberForm(forms.Form):
+    page = forms.ModelChoiceField(
+        help_text=_(
+            'Page number from which all the transformation will be cloned. '
+            'Existing transformations will be lost.'
+        ), queryset=None
+    )
+
+    def __init__(self, *args, **kwargs):
+        self.document = kwargs.pop('document')
+        super(DocumentPageNumberForm, self).__init__(*args, **kwargs)
+        self.fields['page'].queryset = self.document.pages.all()