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)
notify(ObjectCreatedEvent(img))
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):
"""Claim"""
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.
Regards,
Adam
Tom Dossis wrote:
Adam Summers wrote:
Hi,
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 =
MyImageWidget)
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.
<snip>
class ImageInputWidget(FileWidget):
def _toFieldValue(self, input):
data = "" self)._toFieldValue(input)
if data is not None:
img = Image(data)
notify(ObjectCreatedEvent(img))
return img
def __call__(self):
input_widget = super(ImageWidget, self).__call__()
try:
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
</snippet>
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