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public: MyButton( QWidget *parent=0 ); QSize sizeHint() const; protected: void paintEvent( QPaintEvent* ); }; You can review the constructor and the sizeHint method in Listing 7-9. The constructor simply passes on the parent argument to the parent class. The sizeHint method returns the size that the widget wants. This is just a hint given to the Qt layout classes, so you can t rely on the widget getting these dimensions. Sizes are represented by QSize objects, which have two properties: width and height. For the button, these two measurements are dependent on the text to show and the font to use for showing it. To learn about the dimensions of a given QFont, use a QFontMetrics object. All widgets have a fontMetrics property returning a QFontMetrics object for the current font. By asking this object about the width and the height of a given string and then adding 10 pixels extra in each direction for margins, you get an appropriate size for the widget.

There are buttons to do the following: Save the form Add a new set of person fields Remove a particular set of person fields To rerender the form after any of these actions, you need to calculate the number of people so that the form is regenerated with the correct number of sets of person fields Here s a function to do that: def number_of_people(values): people_count = 0 for key in valueskeys(): if keystartswith('person-') and keyendswith('title'): people_count += 1 return people_count.

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We provide a treasure chest analogy to explain how asymmetric cryptography works. If Bob wants people to be able to send him messages secretly, he can ask them to put these messages inside of a treasure chest, and give him the treasure chest. Then he can open the treasure chest. Imagine that Bob can go to some public area such as a park and leave as many open treasure chests as he wants. When people want to send Bob a message, they can put the message into the chest and close it. Anyone is able to lock the treasure chest just by closing it. Bob can come to the park at some point and look at which treasure chests have been locked. Bob has a key that he can use to unlock the treasure chests to retrieve the private messages that people left for him. This basic idea is summarized in the following illustration. In essence, in asymmetric cryptography, when Bob gives out his public key, it is like him giving out an open, empty treasure chest. Anybody can put a message in the treasure chest and lock it by encrypting with Bob s public key. Bob is the only one who can open the treasure chest because his private key is the key to the treasure chest. When Bob does a decryption with his private key, it corresponds to unlocking the chest.

Note The height of a given font doesn t depend on the text being entered. Instead, it takes the possible

You ll also need a function to render the template and fill it with the correct values and error messages: def render_form(values=None, errors=None, number_of_people=0): c.number_of_people = number_of_people html = render('/derived/form.html') return htmlfill.render(html, defaults=values, errors=errors) You can add these two functions beneath the schema definitions in your controller. All the buttons have the same name, action, so the process() action you ll create can determine which button has been pressed by looking at the value of the action URL parameter. Here is the complete code including the schemas, validators, and controller: import logging from pylons import request, response, session, tmpl_context as c from pylons.controllers.util import abort, redirect_to from formexample.lib.base import BaseController, render #from formexample import model log = logging.getLogger(__name__) from formencode.schema import Schema from formencode.validators import Invalid, FancyValidator from formencode.validators import Int, DateConverter, String, one of from formencode import variabledecode from formencode import htmlfill from formencode.foreach import ForEach from formencode.api import NoDefault class OneChiefInvestigator(FancyValidator): messages = { 'too_many_cis':"Only one Chief Investigator is allowed, not %(number)s" } def validate_python(self, values, c): chief_investigators_found = 0 for person in values['person']: if person['role'] == u'1': chief_investigators_found += 1 if chief_investigators_found > 1: raise Invalid( self.message("too_many_cis", c, number=chief_investigators_found), values, c ) class Person(Schema): title = String() firstname = String(not_empty=True) surname = String(not_empty=True) role = OneOf(['1', '2', '3'])

class Study(Schema): allow_extra_fields = True filter_extra_fields = True pre_validators = [variabledecode.NestedVariables()] title = String(not_empty=True) start_date = DateConverter() end_date = DateConverter() person = ForEach( Person(), if_missing=NoDefault, messages={'missing':'Please add a person'} ) chained_validators = [OneChiefInvestigator()] def render_form(values=None, errors=None, number_of_people=0): c.number_of_people = number_of_people html = render('/derived/form.html') return htmlfill.render(html, defaults=values, errors=errors) def number_of_people(values): people_count = 0 for key in values.keys(): if key.startswith('person-') and key.endswith('title'): people_count += 1 return people_count class StudyController(BaseController): def index(self): return render_form() def process(self): action = request.params.getone('action') values = dict(request.params) # Don't use the values field for repopulation del values['action'] if action == 'Add New Person': # Render the form with one extra set of person fields return render_form( values=values, number_of_people = number_of_people(values) + 1 ) elif action.startswith('Remove'): # Get the ID of the set of person fields to remove id = int(action.split(' ')[-1]) # Create a new set of values without those fields new_values = {} for k, v in values.items(): if not k.startswith('person-'+str(id)+'.'): new_values[k] = v # Render the form with the new values return render_form( values=new_values, number_of_people = number_of_people(new_values) )

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