.. image:: https://img.shields.io/badge/licence-AGPL--3-blue.svg
   :target: http://www.gnu.org/licenses/agpl-3.0-standalone.html
   :alt: License: AGPL-3

===========================
2D matrix for x2many fields
===========================

This module allows to show an x2many field with 3-tuples
($x_value, $y_value, $value) in a table

========= =========== ===========
\          $x_value1   $x_value2
========= =========== ===========
$y_value1 $value(1/1) $value(2/1)
$y_value2 $value(1/2) $value(2/2)
========= =========== ===========

where `value(n/n)` is editable.

An example use case would be: Select some projects and some employees so that
a manager can easily fill in the planned_hours for one task per employee. The
result could look like this:

.. image:: /web_widget_x2many_2d_matrix/static/description/screenshot.png
    :alt: Screenshot

The beauty of this is that you have an arbitrary amount of columns with this
widget, trying to get this in standard x2many lists involves some quite ugly
hacks.

Usage
=====

Use this widget by saying::

<field name="my_field" widget="x2many_2d_matrix" />

This assumes that my_field refers to a model with the fields `x`, `y` and
`value`. If your fields are named differently, pass the correct names as
attributes::

<field name="my_field" widget="x2many_2d_matrix" field_x_axis="my_field1" field_y_axis="my_field2" field_value="my_field3" />

You can pass the following parameters:

field_x_axis
    The field that indicates the x value of a point
field_y_axis
    The field that indicates the y value of a point
field_label_x_axis
    Use another field to display in the table header
field_label_y_axis
    Use another field to display in the table header
x_axis_clickable
    It indicates if the X axis allows to be clicked for navigating to the field
    (if it's a many2one field). True by default
y_axis_clickable
    It indicates if the Y axis allows to be clicked for navigating to the field
    (if it's a many2one field). True by default
field_value
    Show this field as value
show_row_totals
    If field_value is a numeric field, it indicates if you want to calculate
    row totals. True by default
show_column_totals
    If field_value is a numeric field, it indicates if you want to calculate
    column totals. True by default
field_att_<name>
    Declare as many options prefixed with this string as you need for binding
    a field value with an HTML node attribute (disabled, class, style...)
    called as the `<name>` passed in the option.

.. image:: https://odoo-community.org/website/image/ir.attachment/5784_f2813bd/datas
   :alt: Try me on Runbot
   :target: https://runbot.odoo-community.org/runbot/162/8.0

Example
=======

You need a data structure already filled with values. Let's assume we want to
use this widget in a wizard that lets the user fill in planned hours for one
task per project per user. In this case, we can use ``project.task`` as our
data model and point to it from our wizard. The crucial part is that we fill
the field in the default function::

 class MyWizard(models.TransientModel):
    _name = 'my.wizard'

    def _default_task_ids(self):
        # your list of project should come from the context, some selection
        # in a previous wizard or wherever else
        projects = self.env['project.project'].browse([1, 2, 3])
        # same with users
        users = self.env['res.users'].browse([1, 2, 3])
        return [
            (0, 0, {'project_id': p.id, 'user_id': u.id, 'planned_hours': 0})
            # if the project doesn't have a task for the user, create a new one
            if not p.task_ids.filtered(lambda x: x.user_id == u) else
            # otherwise, return the task
            (4, p.task_ids.filtered(lambda x: x.user_id == u)[0].id)
            for p in projects
            for u in users
        ]

    task_ids = fields.Many2many('project.task', default=_default_task_ids)

Now in our wizard, we can use::

<field name="task_ids" widget="x2many_2d_matrix" field_x_axis="project_id" field_y_axis="user_id" field_value="planned_hours" />

Note that all values in the matrix must exist, so you need to create them
previously if not present, but you can control visually the editability of
the fields in the matrix through `field_att_disabled` option with a control
field.

Known issues / Roadmap
======================

* It would be worth trying to instantiate the proper field widget and let it render the input
* Let the widget deal with the missing values of the full Cartesian product,
  instead of being forced to pre-fill all the possible values.
* If you pass values with an onchange, you need to overwrite the model's method
  `onchange` for making the widget work::

 @api.multi
 def onchange(self, values, field_name, field_onchange):
     if "one2many_field" in field_onchange:
         for sub in [<field_list>]:
             field_onchange.setdefault("one2many_field." + sub, u"")
     return super(model, self).onchange(values, field_name, field_onchange)

Bug Tracker
===========

Bugs are tracked on `GitHub Issues
<https://github.com/OCA/web/issues>`_. In case of trouble, please
check there if your issue has already been reported. If you spotted it first,
help us smashing it by providing a detailed and welcomed feedback.

Credits
=======

Contributors
------------

* Holger Brunn <hbrunn@therp.nl>
* Pedro M. Baeza <pedro.baeza@tecnativa.com>

Maintainer
----------

.. image:: https://odoo-community.org/logo.png
   :alt: Odoo Community Association
   :target: https://odoo-community.org

This module is maintained by the OCA.

OCA, or the Odoo Community Association, is a nonprofit organization whose
mission is to support the collaborative development of Odoo features and
promote its widespread use.

To contribute to this module, please visit https://odoo-community.org.
