Magento 2 - how to reference a template of my theme in a layout file?

Question

I have this file

app\design\frontend\company\mytheme\web\templates\header\foobar.phtml

How can I reference it in a layout file e.g. in

app\design\frontend\company\mytheme\Magento_Theme\layout\default.xml

e.g. to set it as a template for a block?

<referenceContainer name="header.container">
 <container name="header-wrapper" label="Page Header" as="header-wrapper" htmlTag="div" htmlClass="header content foobar">
 <block class="Magento\Theme\Block\Html\Header\Logo"
 name="logo" 
 template="Magento_Theme::foobar.phtml" <-- this does not work... how to make it right and set foobar.phtml as template ?
 >
 <arguments>
 <argument name="logo_img_width" xsi:type="number">189</argument>
 <argument name="logo_img_height" xsi:type="number">64</argument>
 </arguments>
 </block>
 </container>
</referenceContainer>

If I move foobar.phtml to app\design\frontend\company\mytheme\Magento_Theme\templates then it works, but how does it work from my themes web directory?

Answer 1

I solved it by creating a new folder named Company_Mytheme (Vendor_Themename) and moving foobar.phtml to

app\design\frontend\company\mytheme\Company_Mytheme\templates\foobar.phtml

Then I referenced it like this:

<referenceContainer name="header.container">
 <container name="header-wrapper" label="Page Header" as="header-wrapper" htmlTag="div" htmlClass="header content foobar">
 <block class="Magento\Theme\Block\Html\Header\Logo"
 name="logo" 
 template="Company_Mytheme::foobar.phtml"
 >
 <arguments>
 <argument name="logo_img_width" xsi:type="number">189</argument>
 <argument name="logo_img_height" xsi:type="number">64</argument>
 </arguments>
 </block>
 </container>
</referenceContainer>

You can name the folder anything you like, e.g. Foo_Bar, it will also work, you just have to make sure to use it in the layout