Add events to add fields in tab form

[ihor-sviziev]

For now we have a lot places, that contains code like this:

/** @var \Magento\Data\Form $form */
$form = $this->_formFactory->create();
$fieldset = $form->addFieldset('tiered_price', array('legend' => __('Tier Pricing')));

$fieldset->addField('default_price', 'label', array(
    'label' => __('Default Price'),
    'title' => __('Default Price'),
    'name'  => 'default_price',
    'bold'  => true,
    'value' => $product->getPrice()
));

But we haven't events to add additional fields.

Example:

magento2/app/code/Magento/Catalog/Block/Adminhtml/Product/Edit/Tab/Price.php

Line 39 in cc63630

$form = $this->_formFactory->create();

magento2/app/code/Magento/Adminhtml/Block/System/Cache/Form.php

Line 49 in 0849373

$fieldset = $form->addFieldset('cache_enable', array(

[kandy]

You can use interceptors on setForm to implement this.

[verklov]

@igor-svizev ,
Did you try the approach suggested by @kandy ? If yes, did this resolve the issue that you had?

[ihor-sviziev]

@kandy , could you provide example how to make it?

[verklov]

@igor-svizev , we will file this issue to our internal bug tracker. Thank you for reporting this to us!

[maksek]

What going to be use-case with events? It seems like much easier to create new block and configure layout to use it.

[ihor-sviziev]

@maksek how I can add new fields to existing forms, as example if my module will add some field to admin user form?

[kandy]

You can define "before" plugin on $this->setForm($form) method of block and get $form as arguments, and change form as you need.

[antonkril]

@kandy this approach will work, but I think here we need an explicit extension point, same as for addTab