Finally! It's here :D
Improve your theme UX by providing a preview image of your custom page templates of any post type. You can use this plugin as plugin obviously but if you want you can easily integrate this plugin with your theme or you can just use the class throwing the directory far away.
Along with the regular custom template header just add another header key Preview Image. And then pass the image source as the value of Preview Image. Make sure image source is relative to your theme directory. You can change the header key using filter hook wp_template_preview_header or you can hack the source code if you are going to tightly integrate this plugin with your theme. Please check the following code to understand the header key: value relation clearly.
<?php
/**
* Template Name: Right Sidebar
* Preview Image: assets/images/template-preview/right-sidebar.png
*/You will see a link Template Preview just above the page template dropdown list. Select a template from the list and click on Template Preview link.
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- Md Jahidul Islam - Added template preview link feature.