Rewrite stream rendering to avoid client-side expanding

* adding streams in client breaks things (e.g. autofocus)
* some tasks need to be performed in one stream action to avoid
  flickering (e.g. table row substitution)

app/helpers/application_helper.rb

@@ -103,8 +103,6 @@ module ApplicationHelper
   end
 
   def render_turbo_stream(partial, locals)
-    # TODO: extend with smth like "if outside of rendering, render; otherwise
-    # appendChild() template within current render"
     "Turbo.renderStreamMessage('#{j(render partial: partial, locals: locals)}'); return false;"
   end
 

app/javascript/application.js

@@ -14,6 +14,7 @@ function beforeStreamRender(event) {
 document.addEventListener('turbo:before-stream-render', beforeStreamRender)
 */
 
+/*
 Turbo.session.streamMessageRenderer.appendFragment = async function (fragment) {
   for (let child of [...fragment.children]) {
     document.documentElement.appendChild(child)
@@ -32,6 +33,38 @@ Turbo.session.streamMessageRenderer.appendFragment = async function (fragment) {
   }
 }
 
+window.renderTurboStream = function (message) {
+  // Render if not already rendering, otherwise just append fragment to DOM
+  if (document.documentElement.getElementsByTagName("turbo-stream").length == 0) {
+    Turbo.renderStreamMessage(message)
+  } else {
+    Turbo.session.streamMessageRenderer
+      .appendFragment(Turbo.StreamMessage.wrap(message).fragment)
+  }
+}
+*/
+
+Turbo.StreamElement.prototype.enableElement = function(element) {
+    element.removeAttribute("disabled")
+    element.removeAttribute("aria-disabled")
+    // 'tabindex' is not used explicitly, so removing it is safe
+    element.removeAttribute("tabindex")
+}
+
+Turbo.StreamElement.prototype.removePreviousForm = function(form) {
+  const id = form.id
+  const row = document.getElementById(id + "_cached")
+  form.remove()
+  if (row) {
+    row.id = id
+    row.style.display = "revert"
+  }
+  if (form.hasAttribute("data-link-id")) {
+    const link = document.getElementById(form.getAttribute("data-link-id"))
+    this.enableElement(link)
+  }
+}
+
 
 Turbo.StreamActions.disable = function() {
   this.targetElements.forEach((e) => {
@@ -42,12 +75,7 @@ Turbo.StreamActions.disable = function() {
 }
 
 Turbo.StreamActions.enable = function() {
-  this.targetElements.forEach((e) => {
-    e.removeAttribute("disabled")
-    e.removeAttribute("aria-disabled")
-    // 'tabindex' is not used explicitly, so removing it is safe
-    e.removeAttribute("tabindex")
-  })
+  this.targetElements.forEach((e) => { this.enableElement(e) })
 }
 
 Turbo.StreamActions.blur = function() {
@@ -59,6 +87,43 @@ Turbo.StreamActions.focus = function() {
   this.targetElements[0].focus({focusVisible: true})
 }
 
+Turbo.StreamActions.prepend_form = function() {
+  this.targetElements.forEach((e) => {
+    [...e.getElementsByClassName("form")].forEach((f) => {
+      this.removePreviousForm(f)
+    })
+    e.prepend(this.templateContent)
+  })
+}
+
+Turbo.StreamActions.after_form = function() {
+  this.targetElements.forEach((e) => {
+    [...e.parentElement?.getElementsByClassName("form")].forEach((f) => {
+      this.removePreviousForm(f)
+    })
+    e.parentElement?.insertBefore(this.templateContent, e.nextSibling)
+  })
+}
+
+Turbo.StreamActions.replace_form = function() {
+  this.targetElements.forEach((e) => {
+    [...e.parentElement?.getElementsByClassName("form")].forEach((f) => {
+      this.removePreviousForm(f)
+    })
+    e.style.display = "none"
+    e.id = e.id + "_cached"
+    e.parentElement?.insertBefore(this.templateContent, e.nextSibling)
+  })
+}
+
+Turbo.StreamActions.close_form = function() {
+  this.targetElements.forEach((e) => {
+    this.removePreviousForm(e.closest(".form"))
+  })
+}
+
+/*
 Turbo.StreamActions.click = function() {
   this.targetElements.forEach((e) => { e.click() })
 }
+*/

app/views/units/_form.html.erb

@@ -1,5 +1,7 @@
 <%= fields_for @unit do |form| %>
-  <tr id="<%= dom_id(@unit) %>" onkeydown="processKey(event)">
+  <%= tag.tr id: dom_id(@unit), class: "form", onkeydown: "processKey(event)",
+    data: {link_id: link_id} do %>
+
     <td class="<%= class_names({subunit: @unit.base}) %>">
       <%= form.text_field :symbol, form: :unit_form, required: true, autofocus: true, size: 12,
         maxlength: @unit.class.columns_hash['symbol'].limit, autocomplete: "off" %>
@@ -19,8 +21,8 @@
     <td class="actions">
       <%= form.submit form: :unit_form %>
       <%= image_link_to t(:cancel), "close-circle-outline", units_path, class: 'dangerous',
-        name: :cancel, onclick: render_turbo_stream('form_close', {id: id}) %>
+        name: :cancel, onclick: render_turbo_stream('form_close', {link_id: link_id}) %>
     </td>
-  </tr>
+  <% end %>
   <!-- TODO: display error_messages_for unit -->
 <% end %>

app/views/units/_form_close.html.erb

@@ -1,3 +1,2 @@
-<%= @unit.persisted? ? turbo_stream.replace(@unit) : turbo_stream.remove(@unit) %>
-<%= turbo_stream.enable id %>
-<%= turbo_stream.focus id %>
+<%= turbo_stream.close_form @unit %>
+<%#= turbo_stream.focus link_id %>

app/views/units/edit.turbo_stream.erb

@@ -1,7 +1,7 @@
 <%# TODO: make sure turbo_stream layout is used in new/edit %>
-<%= turbo_stream.replace @unit, partial: 'form', locals: {id: dom_id(@unit, :edit)} %>
-
 <%= turbo_stream.update :unit_form_frame do %>
   <%= form_with model: @unit, html: {id: :unit_form} do %>
   <% end %>
-<% end unless @unit.errors.present? %>
+<% end %>
+
+<%= turbo_stream.replace_form @unit, partial: 'form', locals: {link_id: dom_id(@unit, :edit)} %>

app/views/units/new.turbo_stream.erb

@@ -1,20 +1,9 @@
-<% options = {partial: 'form', locals: {id: dom_id(@unit.base || @unit, :add)}} %>
+<% link_id = dom_id(@unit.base || @unit, :add) %>
+<%= turbo_stream.disable link_id -%>
 
-<% if @unit.errors.present? %>
-  <%= turbo_stream.replace @unit, **options -%>
-<% else %>
-  <%= turbo_stream.disable options[:locals][:id] -%>
-  <%= turbo_stream.click_all 'tbody a[name=cancel]' -%>
-  <%#= turbo_stream.blur_all %>
-
-  <% if @unit.base.nil? %>
-    <%= turbo_stream.prepend :units, **options -%>
-  <% else %>
-    <%= turbo_stream.after @unit.base, **options -%>
-  <% end %>
-
-  <%= turbo_stream.update :unit_form_frame do %>
-    <%= form_with model: @unit, html: {id: :unit_form} do %>
-    <% end %>
+<%= turbo_stream.update :unit_form_frame do %>
+  <%= form_with model: @unit, html: {id: :unit_form} do %>
   <% end %>
 <% end %>
+
+<%= turbo_stream.insert_form (@unit.base || :units), partial: 'form', locals: {link_id: link_id} %>

config/initializers/turbo_stream_actions.rb

@@ -23,11 +23,27 @@ ActiveSupport.on_load :turbo_streams_tag_builder do
     action :focus, target, allow_inferred_rendering: false
   end
 
-  def click(target)
-    action :click, target, allow_inferred_rendering: false
+  #def click(target)
+  #  action :click, target, allow_inferred_rendering: false
+  #end
+
+  #def click_all(targets)
+  #  action_all :click, targets, allow_inferred_rendering: false
+  #end
+
+  def insert_form(target, content = nil, **rendering, &block)
+    if target.is_a? Symbol
+      action :prepend_form, target, content, **rendering, &block
+    else
+      action :after_form, target, content, **rendering, &block
+    end
   end
 
-  def click_all(targets)
-    action_all :click, targets, allow_inferred_rendering: false
+  def replace_form(target, content = nil, **rendering, &block)
+    action :replace_form, target, content, **rendering, &block
+  end
+
+  def close_form(target)
+    action :close_form, target, allow_inferred_rendering: false
   end
 end