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Tutorial 5: Customizing INVO

To finish the detailed explanation of INVO we are going to explain how to customize INVO adding UI elements and changing the title according to the controller executed.

User Components

All the UI elements and visual style of the application has been achieved mostly through Bootstrap. Some elements, such as the navigation bar changes according to the state of the application. For example, in the upper right corner, the link “Log in / Sign Up” changes to “Log out” if a user is logged into the application.

This part of the application is implemented in the component “Elements” (app/library/Elements.php).

<?php

use Phalcon\Mvc\User\Component;

class Elements extends Component
{
    public function getMenu()
    {
        // ...
    }

    public function getTabs()
    {
        // ...
    }
}

This class extends the Phalcon\Mvc\User\Component. It is not imposed to extend a component with this class, but it helps to get access more quickly to the application services. Now, we are going to register our first user component in the services container:

<?php

// Register a user component
$di->set(
    "elements",
    function () {
        return new Elements();
    }
);

As controllers, plugins or components within a view, this component also has access to the services registered in the container and by just accessing an attribute with the same name as a previously registered service:

<div class="navbar navbar-fixed-top">
    <div class="navbar-inner">
        <div class="container">
            <a class="btn btn-navbar" data-toggle="collapse" data-target=".nav-collapse">
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
            </a>

            <a class="brand" href="#">INVO</a>

            {{ elements.getMenu() }}
        </div>
    </div>
</div>

<div class="container">
    {{ content() }}

    <hr>

    <footer>
        <p>&copy; Company 2015</p>
    </footer>
</div>

The important part is:

{{ elements.getMenu() }}

Changing the Title Dynamically

When you browse between one option and another will see that the title changes dynamically indicating where we are currently working. This is achieved in each controller initializer:

<?php

class ProductsController extends ControllerBase
{
    public function initialize()
    {
        // Set the document title
        $this->tag->setTitle(
            "Manage your product types"
        );

        parent::initialize();
    }

    // ...
}

Note, that the method parent::initialize() is also called, it adds more data to the title:

<?php

use Phalcon\Mvc\Controller;

class ControllerBase extends Controller
{
    protected function initialize()
    {
        // Prepend the application name to the title
        $this->tag->prependTitle(
            "INVO | "
        );
    }

    // ...
}

Finally, the title is printed in the main view (app/views/index.volt):

<!DOCTYPE html>
<html>
    <head>
        <?php echo $this->tag->getTitle(); ?>
    </head>

    <!-- ... -->
</html>
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