[IMP] event,website_event_questions: improve attendees list view

In this commit we have improved the attendees list
view, changes done are listed below,

- We have changed the cancel button
  color to red in attendees list view.

- We have added badge widget for the
  state field in attendees list view, the following
  states uses these colors,

  - draft - blue
  - cancel - grey
  - open - blue
  - done - green

- We have added a `activity_ids` before the field `state`
  field in attendees list view.

- We have added the field `registration_answer_ids` with
  `many2many_tags` and default hide in attendees list view
  just before the status field.

TaskID-2670765

Part-of: odoo/odoo#79166

addons/event/static/src/scss/event.scss

@@ -24,3 +24,12 @@
         }
     }
 }
+
+.o_event_registration_view_tree {
+    .o_list_button > .o_btn_cancel_registration {
+        color: $danger;
+        &:hover {
+            color: darken($danger, $emphasized-link-hover-darken-percentage);
+        }
+    }
+}

addons/event/views/event_views.xml

@@ -510,12 +510,17 @@
                     <field name="mobile" optional="hide"/>
                     <field name="event_id" invisible="context.get('default_event_id')"/>
                     <field name="event_ticket_id" domain="[('event_id', '=', event_id)]"/>
-                    <field name="state" readonly="0"/>
+                    <field name="activity_ids" widget="list_activity"/>
+                    <field name="state" decoration-info="state in ('draft', 'open')"
+                           decoration-success="state == 'done'"
+                           decoration-muted="state == 'cancel'" widget="badge"/>
                     <field name="company_id" groups="base.group_multi_company" optional="hide"/>
                     <field name="message_needaction" invisible="1"/>
                     <button name="action_confirm" string="Confirm" states="draft" type="object" icon="fa-check"/>
                     <button name="action_set_done" string="Mark as Attending" states="open" type="object" icon="fa-level-down"/>
-                    <button name="action_cancel" string="Cancel" states="draft,open" type="object" icon="fa-times"/>
+                    <button name="action_cancel" string="Cancel"
+                            states="draft,open" type="object"
+                            class="o_btn_cancel_registration" icon="fa-times"/>
                     <field name="activity_exception_decoration" widget="activity_exception"/>
                 </tree>
             </field>

addons/website_event_questions/models/event_registration.py

@@ -28,3 +28,12 @@ class EventRegistrationAnswer(models.Model):
     _sql_constraints = [
         ('value_check', "CHECK(value_answer_id IS NOT NULL OR COALESCE(value_text_box, '') <> '')", "There must be a suggested value or a text value.")
     ]
+
+    # for displaying selected answers by attendees in attendees list view
+    def name_get(self):
+        return [
+            (reg.id,
+             reg.value_answer_id.name if reg.question_type == "simple_choice" else reg.value_text_box
+             )
+            for reg in self
+        ]

addons/website_event_questions/views/event_registration_views.xml

@@ -24,4 +24,15 @@
             </sheet>
         </field>
     </record>
+
+    <record id="event_registration_view_tree" model="ir.ui.view">
+        <field name="name">event.registration.view.tree.inherit.website.event.questions</field>
+        <field name="model">event.registration</field>
+        <field name="inherit_id" ref="event.view_event_registration_tree"/>
+        <field name="arch" type="xml">
+            <field name="state" position="before">
+                <field name="registration_answer_ids" string="Selected Answers" widget="many2many_tags" optional="hide"/>
+            </field>
+        </field>
+    </record>
 </odoo>