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@ -21,12 +21,14 @@ import functools |
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import traceback |
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from sys import stderr |
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from django import forms |
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from django.http import HttpResponse |
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from django.conf import settings |
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from django.conf.urls.defaults import patterns |
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from django.conf.urls.defaults import patterns, url |
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from django.core.urlresolvers import reverse |
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from django.utils.datastructures import MultiValueDictKeyError |
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from django.views.decorators.csrf import csrf_exempt |
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from django.utils.safestring import mark_safe |
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def getname( cls_or_name ): |
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@ -34,6 +36,33 @@ def getname( cls_or_name ): |
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return cls_or_name.__name__ |
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return cls_or_name |
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# Template used for the auto-generated form classes |
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EXT_CLASS_TEMPLATE = """ |
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Ext.namespace('Ext.ux'); |
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Ext.ux.%(clsname)s = function( config ){ |
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Ext.apply( this, config ); |
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var defaultconf = %(defaultconf)s; |
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Ext.applyIf( this, defaultconf ); |
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this.initialConfig = defaultconf; |
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Ext.ux.%(clsname)s.superclass.constructor.call( this ); |
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this.form.api = %(apiconf)s; |
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this.form.paramsAsHash = true; |
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} |
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Ext.extend( Ext.ux.%(clsname)s, Ext.form.FormPanel, {} ); |
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Ext.reg( '%(clslowername)s', Ext.ux.%(clsname)s ); |
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""" |
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# About the this.form.* lines, see |
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# http://www.sencha.com/forum/showthread.php?96001-solved-Ext.Direct-load-data-in-extended-Form-fails-%28scope-issue%29 |
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class Provider( object ): |
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""" Provider for Ext.Direct. This class handles building API information and |
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routing requests to the appropriate functions, and serializing their |
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@ -83,26 +112,52 @@ class Provider( object ): |
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self.name = name |
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self.autoadd = autoadd |
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self.classes = {} |
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self.forms = {} |
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def register_method( self, cls_or_name ): |
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def register_method( self, cls_or_name, flags={} ): |
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""" Return a function that takes a method as an argument and adds that |
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to cls_or_name. |
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The flags parameter is for additional information, e.g. formHandler=True. |
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Note: This decorator does not replace the method by a new function, |
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it returns the original function as-is. |
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""" |
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return functools.partial( self._register_method, cls_or_name, flags=flags ) |
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def _register_method( self, cls_or_name, method, flags={} ): |
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""" Actually registers the given function as a method of cls_or_name. """ |
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clsname = getname(cls_or_name) |
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if clsname not in self.classes: |
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self.classes[clsname] = {} |
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return functools.partial( self._register_method, cls_or_name ) |
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def _register_method( self, cls_or_name, method ): |
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""" Actually registers the given function as a method of cls_or_name. """ |
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self.classes[ getname(cls_or_name) ][ method.__name__ ] = method |
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self.classes[ clsname ][ method.__name__ ] = method |
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method.EXT_argnames = inspect.getargspec( method ).args[1:] |
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method.EXT_len = len( method.EXT_argnames ) |
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method.EXT_flags = flags |
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return method |
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def register_form( self, formclass ): |
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""" Register a Django Form class for handling teh stuffz, yoo know. """ |
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formname = formclass.__name__.lower() |
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self.forms[formname] = formclass |
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getfunc = functools.partial( self.get_form_data, formname ) |
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getfunc.EXT_len = 1 |
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getfunc.EXT_argnames = ["pk"] |
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getfunc.EXT_flags = {} |
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updatefunc = functools.partial( self.update_form_data, formname ) |
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updatefunc.EXT_len = 1 |
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updatefunc.EXT_argnames = ["pk"] |
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updatefunc.EXT_flags = { 'formHandler': True } |
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self.classes["XD_%s"%formclass.__name__] = { |
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"get": getfunc, |
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"update": updatefunc, |
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} |
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return formclass |
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@csrf_exempt |
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def get_api( self, request ): |
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""" Introspect the methods and get a JSON description of this API. """ |
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@ -110,10 +165,12 @@ class Provider( object ): |
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for clsname in self.classes: |
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actdict[clsname] = [] |
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for methodname in self.classes[clsname]: |
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actdict[clsname].append( { |
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methinfo = { |
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"name": methodname, |
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"len": self.classes[clsname][methodname].EXT_len |
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} ) |
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} |
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methinfo.update( self.classes[clsname][methodname].EXT_flags ) |
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actdict[clsname].append( methinfo ) |
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lines = ["%s = %s;" % ( self.name, simplejson.dumps({ |
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"url": reverse( self.request ), |
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@ -137,10 +194,14 @@ class Provider( object ): |
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rawjson = [{ |
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'action': request.POST['extAction'], |
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'method': request.POST['extMethod'], |
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'data': request.POST['extData'], |
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'type': request.POST['extType'], |
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'tid': request.POST['extTID'], |
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'data': {} |
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}] |
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for fld in request.POST: |
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if not fld.startswith( "ext" ): |
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rawjson[0]['data'][fld] = request.POST[fld] |
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except (MultiValueDictKeyError, KeyError): |
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rawjson = simplejson.loads( request.raw_post_data ) |
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if not isinstance( rawjson, list ): |
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@ -221,10 +282,100 @@ class Provider( object ): |
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else: |
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return HttpResponse( simplejson.dumps( responses ), mimetype="text/javascript" ) |
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def get_form( self, request, formname ): |
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""" Convert the form given in "formname" to an ExtJS FormPanel. """ |
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items = [] |
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clsname = self.forms[formname].__name__ |
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for fldname in self.forms[formname].base_fields: |
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field = self.forms[formname].base_fields[fldname] |
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extfld = { |
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"fieldLabel": field.label is not None and unicode(field.label) or fldname, |
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"name": fldname, |
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"xtype": "textfield", |
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#"allowEmpty": field.required, |
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} |
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if hasattr( field, "choices" ) and field.choices: |
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extfld.update({ |
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"name": fldname, |
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"hiddenName": fldname, |
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"xtype": "combo", |
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"store": field.choices, |
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"typeAhead": True, |
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"emptyText": 'Select...', |
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"triggerAction": 'all', |
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"selectOnFocus": True, |
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}) |
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elif isinstance( field, forms.BooleanField ): |
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extfld.update({ |
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"xtype": "checkbox" |
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}) |
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elif isinstance( field, forms.IntegerField ): |
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extfld.update({ |
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"xtype": "numberfield", |
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}) |
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elif isinstance( field, forms.FileField ) or isinstance( field, forms.ImageField ): |
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extfld.update({ |
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"xtype": "textfield", |
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"inputType": "file" |
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}) |
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elif isinstance( field.widget, forms.Textarea ): |
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extfld.update({ |
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"xtype": "textarea", |
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}) |
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elif isinstance( field.widget, forms.PasswordInput ): |
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extfld.update({ |
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"xtype": "textfield", |
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"inputType": "password" |
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}) |
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items.append( extfld ) |
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if field.help_text: |
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items.append({ |
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"xtype": "label", |
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"text": unicode(field.help_text), |
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"cls": "form_hint_label", |
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}) |
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clscode = EXT_CLASS_TEMPLATE % { |
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'clsname': clsname, |
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'clslowername': formname, |
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'defaultconf': simplejson.dumps({ |
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'items': items, |
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'defaults': { "anchor": "-20px" }, |
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'paramsAsHash': True, |
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}, indent=4 ), |
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'apiconf': ('{' |
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'load: ' + ("XD_%s.get" % clsname) + "," |
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'submit:' + ("XD_%s.update" % clsname) + "," |
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"}"), |
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} |
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return HttpResponse( mark_safe( clscode ), mimetype="text/javascript" ) |
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def get_form_data( self, formname, request, pk ): |
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formcls = self.forms[formname] |
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instance = formcls.Meta.model.objects.get( pk=pk ) |
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forminst = formcls( instance=instance ) |
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data = {} |
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for fld in forminst.fields: |
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data[fld] = getattr( instance, fld ) |
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return { 'data': data, 'success': True } |
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def update_form_data( self, formname, request, *args ): |
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print args |
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return True |
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@property |
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def urls(self): |
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""" Return the URL patterns. """ |
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return patterns('', |
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pat = patterns('', |
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(r'api.js$', self.get_api ), |
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(r'router/?', self.request ), |
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) |
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if self.forms: |
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pat.append( url( r'(?P<formname>\w+).js$', self.get_form ) ) |
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return pat |
Michael Ziegler
15 years ago