[wp-trac] [WordPress Trac] #28709: Improve/introduce Customizer models for Controls, Sections, and Panels

[WordPress Trac]

#28709: Improve/introduce Customizer models for Controls, Sections, and Panels
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 Reporter:  westonruter  |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Future Release
Component:  Customize    |    Version:
 Severity:  normal       |   Keywords:  needs-patch
  Focuses:  javascript   |
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 The Customizer currently has a `Control` model which facilitates
 interacting with a control that was registered in the initial request to
 open the Customizer. As explored in the Widget Customizer (#27112),
 controls may also be dynamically instantiated and destroyed via JavaScript
 (see [https://github.com/x-team/wordpress-
 develop/blob/9ab7f4b1448fee7ab62c764bccff923cdbc82ba8/src/wp-admin/js
 /customize-widgets.js#L1618-L1650 customize-widgets.js]). However, the
 current `Control` model was not specifically designed for this since the
 constructor does not allow you to pass a template for the control to then
 get added to a given section's container element automatically. Instead,
 you're currently required to first construct the control's elements and
 insert them into the page, and then create a new `Control` model instance
 that connects to this element that was inserted into the document.

 In addition to improving the `Control` model to facilitate dynamic
 instantiation via JavaScript, there also need to be models for managing
 Sections and (with #27406) Panels. Just as you can create controls
 dynamically, you should be able to create sections and panels. The models
 should allow the section/panel to have state for whether they are open or
 closed, and they should have methods for expanding/collapsing. They also
 should have collections which represent which controls a section has, and
 which sections a panel has. There should likewise be methods for adding
 controls to sections and adding methods to controls, and the DOM should
 automatically update to move the container elements to their appropriate
 locations when such changes are made.

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Ticket URL: <https://core.trac.wordpress.org/ticket/28709>
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