Hi Tom & Widget Afficionados.

Thanks for the help so far.

My problem is now this:

    From this code (which Tom supplied), how do I code the logic (in bold)      
    def _toFieldValue(self, input):
        data = "" self)._toFieldValue(input)
        if data is not None:
            img = Image(data)
            return img
	else: #data is None, ie. the File input field was left blank and we don't want to 
	    #replace the current value of the Image Widget with an empty value.
	    currentImg = the Image object which the field is being rendered for
	    return currentImg 

I can't rely on

	field = self.context
        image = field.get(field.context)

logic to find the data, because my schema can contain:

class Iclaim(IContained):
	supDoc = List(title=_(u"Supporting Docs List"), value_type=Object(IImage, __name__='ImgItem', title=_(u"Image")))
	img = Object(IImage, title=_(u"Single img"), required=False)

    And hence, the self.context.context points to the claim object, not the list inside when rendering supDoc
Again, any help is much appreciated.
Tom Dossis wrote:
Adam Summers wrote:

I have the following widgets.

class MyImageDisplayWidget(DisplayWidget):

   class_ = Image

   def __call__(self):
       mycontent = u"oops! no img"
       if self._renderedValueSet():
           mycontent = "<img src="" class="moz-txt-link-rfc2396E" href="data:image/gif;base64,">"data:image/gif;base64, " +
b64encode(self._data.data) + " \" />"
       return mycontent

MyImageListDisplayWidget = CustomWidgetFactory(SequenceDisplayWidget,
subwidget = MyImageDisplayWidget)

class MyImageWidget(FileWidget):

   class_ = Image

   def _toFieldValue(self, input):
       value = super(MyImageWidget, self)._toFieldValue(input)
       return self.class_(value)

MyImageListWidget = CustomWidgetFactory(ListSequenceWidget, subwidget =

I want to build a better input widget (MyImageWidget), so that we can do
the following:
   * If the field has no data, display a file input.
   * If the field has data, display the image.

I know that there are design shortcomings in this, but I need a simple
example (and I only use the files in lists anyway, so I can delete images).

Any pointers on how to go about this would be much appreciated; as always

Hi Adam,

I'm not exactly sure of your use case, but I've included a widget
implementation (see below) which you may find useful.  I've used this
widget for an attribute which is an IImage, e.g.


class ImageInputWidget(FileWidget):

    def _toFieldValue(self, input):
        data = "" self)._toFieldValue(input)
        if data is not None:
            img = Image(data)
            return img

    def __call__(self):
        input_widget = super(ImageWidget, self).__call__()
            image = ImageDisplayWidget(self.context, self.request)()
            info = self.info()
            return u'<br />'.join([image, info, input_widget])
        except AttributeError:
            # This happens because the context is IAdding
            return input_widge
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