.. -*- coding: utf-8 -*-

Views & Templates

=================

Look at ``lax/skel/ginco/web/views/basetemplates.py`` and you will

find the base templates used to generate HTML for your application.

A page is composed as indicated on the schema below:

.. image:: images/lax-book.06-main-template-layout.en.png

In this section we will go through a couple of the primary templates

you must be interested in, that is to say, the HTMLPageHeader,

the HTMLPageFooter and the TheMainTemplate.

HTMLPageHeader

--------------

Let's use a different logo than the default one provided with LAX

and customize our header.

Change logo

~~~~~~~~~~~

The easiest way to use a different logo is to replace the existing

``logo.png`` in ``myapp/data`` by your prefered icon and refresh.

By default all application will look for a ``logo.png`` to be 

rendered in the logo section.

.. image:: images/lax-book.06-main-template-logo.en.png

[ADD]

customized external_resources in myapp/data cd crih for reference

[WRITE ME]

ADD how to use external_resources variables used in ginco/web/webconfig.py

Customize header

~~~~~~~~~~~~~~~~

Let's now move the search box in the header and remove the login form

from the header. We'll show how to move it to the left column of the application.

Let's sat we do not want anymore the login menu to be in the header, but we 

prefer it to be in the left column just below the logo. As the left column is

rendered by ``TheMainTemplate``, we will show how to do it in TheMainTemplate_. 

First, to remove the login menu, we just need to comment out the display of the

login component such as follows: ::

  class MyHTMLPageHeader(HTMLPageHeader):

      def main_header(self, view):

          """build the top menu with authentification info and the rql box"""

          self.w(u'<table id="header"><tr>\n')

          self.w(u'<td id="firstcolumn">')

          self.vreg.select_component('logo', self.req, self.rset).dispatch(w=self.w)

          self.w(u'</td>\n')

          # appliname and breadcrumbs

          self.w(u'<td id="headtext">')

          comp = self.vreg.select_component('appliname', self.req, self.rset)

          if comp and comp.propval('visible'):

              comp.dispatch(w=self.w)

          comp = self.vreg.select_component('breadcrumbs', self.req, self.rset, view=view)

          if comp and comp.propval('visible'):

              comp.dispatch(w=self.w, view=view)

          self.w(u'</td>')

          # logged user and help

          #self.w(u'<td>\n')

          #comp = self.vreg.select_component('loggeduserlink', self.req, self.rset)

          #comp.dispatch(w=self.w)

          #self.w(u'</td><td>')

          self.w(u'<td>')

          helpcomp = self.vreg.select_component('help', self.req, self.rset)

          if helpcomp: # may not be available if Card is not defined in the schema

              helpcomp.dispatch(w=self.w)

          self.w(u'</td>')

          # lastcolumn

          self.w(u'<td id="lastcolumn">')

          self.w(u'</td>\n')

          self.w(u'</tr></table>\n')

          self.template('logform', rset=self.rset, id='popupLoginBox', klass='hidden',

                        title=False, message=False)

.. image:: images/lax-book.06-header-no-login.en.png

Let's now move the search box in the top-right header area. To do so, we will

first create a method to get the search box display and insert it in the header

table.

::

 from ginco.web.views.basetemplates import HTMLPageHeader

 class MyHTMLPageHeader(HTMLPageHeader):

    def main_header(self, view):

        """build the top menu with authentification info and the rql box"""

        self.w(u'<table id="header"><tr>\n')

        self.w(u'<td id="firstcolumn">')

        self.vreg.select_component('logo', self.req, self.rset).dispatch(w=self.w)

        self.w(u'</td>\n')

        # appliname and breadcrumbs

        self.w(u'<td id="headtext">')

        comp = self.vreg.select_component('appliname', self.req, self.rset)

        if comp and comp.propval('visible'):

            comp.dispatch(w=self.w)

        comp = self.vreg.select_component('breadcrumbs', self.req, self.rset, view=view)

        if comp and comp.propval('visible'):

            comp.dispatch(w=self.w, view=view)

        self.w(u'</td>')

        # logged user and help

        #self.w(u'<td>\n')

        #comp = self.vreg.select_component('loggeduserlink', self.req, self.rset)

        #comp.dispatch(w=self.w)

        #self.w(u'</td><td>')

        # search box

        self.w(u'<td>')

        self.get_searchbox(view, 'left')

        self.w(u'</td>')

        self.w(u'<td>')

        helpcomp = self.vreg.select_component('help', self.req, self.rset)

        if helpcomp: # may not be available if Card is not defined in the schema

            helpcomp.dispatch(w=self.w)

        self.w(u'</td>')

        # lastcolumn

        self.w(u'<td id="lastcolumn">')

        self.w(u'</td>\n')

        self.w(u'</tr></table>\n')

        self.template('logform', rset=self.rset, id='popupLoginBox', klass='hidden',

                      title=False, message=False)

    def get_searchbox(self, view, context):

        boxes = list(self.vreg.possible_vobjects('boxes', self.req, self.rset,

                                                 view=view, context=context))

        if boxes:

            for box in boxes:

                if box.id == 'search_box':

                    box.dispatch(w=self.w, view=view)

HTMLPageFooter

--------------

If you want to change the footer for example, look

for HTMLPageFooter and override it in your views file as in: 

::

  form ginco.web.views.basetemplates import HTMLPageFooter

  class MyHTMLPageFooter(HTMLPageFooter):

      def call(self, **kwargs):

          self.w(u'<div class="footer">')

          self.w(u'This website has been created with <a href="http://lax.logilab.org">LAX</a>.')

          self.w(u'</div>')

Updating a view does not require any restart of the server. By reloading

the page you can see your new page footer.

TheMainTemplate

---------------

.. _TheMainTemplate:

The MainTemplate is a bit complex as it tries to accomodate many

different cases. We are now about to go through it and cutomize entirely

our application.

TheMainTemplate is responsible for the general layout of the entire application. 

It defines the template of ``id = main`` that is used by the application. Is 

also defined in ``ginco/web/views/basetemplates.py`` another template that can

be used based on TheMainTemplate called SimpleMainTemplate which does not have 

a top section.

.. image:: images/lax-book.06-simple-main-template.en.png

CSS changes

-----------

We cannot modify the order in which the application is reading the CSS. In

the case we want to create new CSS style, the best is to define it a in a new

CSS located under ``myapp/data/``.

If you want to modify an existing CSS styling property, you will have to use

``!important`` declaration to override the existing property. The application

apply a higher priority on the default CSS and you can not change that. 

Customized CSS will not be read first.

1

[TODO]

Add login menu in left column

[WRITE ME]

* customize MainTemplate and show that everything in the user

  interface can be changed

[TODO]

Rajouter une section pour definir la terminologie utilisee.

Dans ginco-doc rajouter une section pour erudi-ctl shell ou

on liste les commandes dispos.