[Zope3-Users] Custom Image Widget - Solution

[Adam Summers]

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from zope.app.form import CustomWidgetFactory
from zope.app.form.browser.widget import DisplayWidget, SimpleInputWidget, renderElement
from zope.app.form.browser.sequencewidget import ListSequenceWidget, SequenceDisplayWidget
from zope.app.file.image import Image
from zope.app.form.interfaces import ConversionError
from base64 import b64encode, b64decode



class MyImageDisplayWidget(DisplayWidget):
	
	def __call__(self):

		mycontent = u"(No Image)"

		if self._renderedValueSet() and self._data is not None:
			mycontent = buildHTMLImg(self._data.data)
		return mycontent

MyImageListDisplayWidget = CustomWidgetFactory(SequenceDisplayWidget, subwidget = MyImageDisplayWidget)

class MyImageInputWidget(SimpleInputWidget):
    """File Widget"""
    type = 'file'
    
    def _toFieldValue(self, input):
        if (input is None or input == ''):
        	try:
        		imgData =  b64decode(self.request.form[self.name + '.data'])
        		return Image(imgData)
        	except AttributeError, e:
         		return self.context.missing_value
        else:	
	        try:
	            seek = input.seek
	            read = input.read
	        except AttributeError, e:
	            raise ConversionError(_('Form input is not a file object'), e)
	        else:
	            seek(0)
	            data = read()
	            if data or getattr(input, 'filename', ''):
	                return Image(data)
	            else:
	                return self.context.missing_value

    	
    def __call__(self):
    	elem = renderElement(self.tag,
                                 type=self.type,
                                 name=self.name,
                                 id=self.name,
                                 extra=self.extra)
        input_widget = elem

    	try: 
    		img_widget = buildHTMLImg(self._data.data)
	        elem = renderElement(self.tag,
                         type='hidden',
                         name=self.name+'.data',
                         id=self.name,
                         extra='value="' + b64encode(self._data.data) + '"') 
    		input_widget = img_widget + input_widget +elem
    		return input_widget
    	except AttributeError:
    		return input_widget	
    	
MyImageInputListWidget = CustomWidgetFactory(ListSequenceWidget, subwidget = MyImageInputWidget)    


def buildHTMLImg(data):
	return "<img src=\"data:image/gif;base64, " + b64encode(data) + " \" />"
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from zope.formlib import form
from as.claim.interfaces import Iclaim
from as.claim.claim import claim
from as.widget.browser.widgets import MyImageListDisplayWidget, MyImageInputListWidget

def _(arg): #yes this is a hack. to be modified
	return arg

class claimAddForm(form.AddForm):
	form_fields = form.Fields(Iclaim).omit('__name__', '__parent__')
	form_fields['supDoc'].custom_widget =  MyImageInputListWidget

	def create(self, data):
		return claim(**data)

class claimEditForm(form.EditForm):
	form_fields = form.Fields(Iclaim).omit('__name__', '__parent__')
	form_fields['supDoc'].custom_widget =  MyImageInputListWidget
	
	#@form.action(_("Apply"), condition=form.haveInputWidgets)
	#def handle_edit_action(self, action, data):
	#	if self.context.modify(data):
	#		self.status = _(u"Object Updated")
	#	else:
	#		self.status = _(u"No Changes")

class claimDisplayForm(form.DisplayForm):
	form_fields = form.Fields(Iclaim).omit('__name__', '__parent__')

	#form_fields['img'].custom_widget = MyImageDisplayWidget
	form_fields['supDoc'].custom_widget = MyImageListDisplayWidget