doc/refactoring-the-css-with-uiprops.rst
author Rémi Cardona <remi.cardona@logilab.fr>
Wed, 12 Feb 2014 17:32:49 +0100
changeset 9534 34d9de030564
parent 5492 da983679fab5
child 10121 23af005426bf
permissions -rw-r--r--
[web/data] Ignore disabled widgets in cw.utils.formContents() (closes #3544492) 17.12.1 Disabled controls : http://www.w3.org/TR/REC-html40/interact/forms.html#h-17.12.1 When set, the disabled attribute has the following effects on an element: * Disabled controls do not receive focus. * Disabled controls are skipped in tabbing navigation. * Disabled controls cannot be successful. The third one is the important one. 17.13.2 Successful controls : http://www.w3.org/TR/REC-html40/interact/forms.html#successful-controls A successful control is "valid" for submission. Every successful control has its control name paired with its current value as part of the submitted form data set. Bottom line, disable widgets should not be part of the names and values lists returned by formContents().

=========================================
Refactoring the CSSs with UI properties
=========================================

Overview
=========

Managing styles progressively became difficult in CubicWeb. The
introduction of uiprops is an attempt to fix this problem.

The goal is to make it possible to use variables in our CSSs.

These variables are defined or computed in the uiprops.py python file
and inserted in the CSS using the Python string interpolation syntax.

A quick example, put in ``uiprops.py``::

  defaultBgColor = '#eee'

and in your css::

  body { background-color: %(defaultBgColor)s; }


The good practices are:

- define a variable in uiprops to avoid repetitions in the CSS
  (colors, borders, fonts, etc.)

- define a variable in uiprops when you need to compute values
  (compute a color palette, etc.)

The algorithm implemented in CubicWeb is the following:

- read uiprops file while walk up the chain of cube dependencies: if
  cube myblog depends on cube comment, the variables defined in myblog
  will have precedence over the ones in comment

- replace the %(varname)s in all the CSSs of all the cubes

Keep in mind that the browser will then interpret the CSSs and apply
the standard cascading mechanism.

FAQ
====

- How do I keep the old style?

  Put ``STYLESHEET = [data('cubicweb.old.css')]`` in your uiprops.py
  file and think about something else.

- What are the changes in cubicweb.css?

  Version 3.9.0 of cubicweb changed the following in the default html
  markup and css:

  ===============  ==================================
   old              new
  ===============  ==================================
   .navcol          #navColumnLeft, #navColumnRight
   #contentcol      #contentColumn
   .footer          #footer
   .logo	    #logo
   .simpleMessage   .loginMessage
   .appMsg	    (styles are removed from css)
   .searchMessage   (styles are removed from css)
  ===============  ==================================

  Introduction of the new cubicweb.reset.css based on Eric Meyer's
  reset css.

  Lots of margin, padding, etc.