Hi! I was able to create one IN ODOO 12!, but i needed to modify some little things in the base and web modules, wich isnt too recomended, but are little changes without risk of "watefall failure"

(essentialy i search in base and web the appears of "decoration-success" together with the other decorators and repast him defining for "decoration-customized1" , and finally creating in one .css  in my main module the style for o_list_view o_data_row o_text-customized1)

1)  base-> ir_ui_view python

add in ATTRS_WITH_FIELD_NAMES the

    'decoration-customized1',

2) in web/static/src/js/views/list/list_renderer.js

in var DECORATIONS = add

    'decoration-customized1',

3) in base/rng/tree_view.rng add:

            <rng:optional><rng:attribute name="decoration-customized1"/></rng:optional>

4)in my main module in

static/src/css/your_custom_classes.css define the style, for example:

.o_list_view .o_data_row.decoration-customized1 {

    background-color: #ffe4b5 !important; /* ejemplo: un beige suave */

    color: #000000 !important; /* texto rojo oscuro */

}

.o_list_view .o_data_row.text-customized1 {

    background-color: #ffe4b5 !important; /* ejemplo: un beige suave */

    color: #000000 !important; /* texto rojo oscuro */

}

5) and then in my main module

views/assets.xml declare

<?xml version="1.0" encoding="UTF-8"?>

<odoo>

  <data>

    <!-- Carga JS y CSS en backend -->

    <template id="assets_backend" inherit_id="web.assets_backend" name="Abatar Trucks Assets">

      <xpath expr="." position="inside">

        <link rel="stylesheet" type="text/css" href="/your_custom_module/static/src/css/your_custom_classes.css"/>

      </xpath>

    </template>

  </data>

</odoo>

6) add the "assets.xml" in your manifest declaration

This had to be enough.

If some dont work i call some modifys additionals that made, but im not sure about if are essentially necessary:

in web/static/lib/bootstrap/css/bootstrap.css

.text-customized1 {

  color: #000000 !important;

}

a.text-customized1:hover, a.text-customized1:focus {

  color: #555555 !important;

}

in web/static/lib/bootstrap/scss/_variables.scss

here are some color definitions that can create

replying the "succes" or "mute" for

customized1

and in web/static/lib/bootstrap/scss/utilities/_text.scss 

too

I hope that be useful like a guide at least!

Hi Guillaume Deflaux,

Can you please check the below link to define custom decorations for the tree view with specify custom colors for lines:

https://www.cybrosys.com/blog/add-colors-to-tree-view-odoo-13

I Hope this will help you. 

Thanks & Regards,
Email: odoo@aktivsoftware.com
Skype: kalpeshmaheshwari