Adds a new HelpPanel (#4374)

CONTRIBUTORS.rst

@@ -281,6 +281,7 @@ Contributors
 * Todd Dembrey
 * Sebastian Brestin
 * Casper Timmers
+* Kevin Chung
 
 Translators
 ===========

docs/reference/pages/panels.rst

@@ -243,6 +243,30 @@ SnippetChooserPanel
     See :ref:`snippets` for more information.
 
 
+HelpPanel
+---------
+
+.. module:: wagtail.admin.edit_handlers
+
+.. class:: HelpPanel(content='', template='wagtailadmin/edit_handlers/help_panel.html', heading='', classname='')
+
+    .. attribute:: HelpPanel.content
+
+        HTML string that gets displayed in the panel.
+
+    .. attribute:: HelpPanel.template
+
+        Path to a template rendering the full panel HTML.
+
+    .. attribute:: HelpPanel.heading
+
+        A heading for the help content.
+
+    .. attribute:: HelpPanel.classname
+
+        String of CSS classes given to the panel which are used in formatting and scripted interactivity.
+
+
 Built-in Fields and Choosers
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 

wagtail/admin/edit_handlers.py

@@ -387,6 +387,27 @@ class MultiFieldPanel(BaseCompositeEditHandler):
         return classes
 
 
+class HelpPanel(EditHandler):
+    def __init__(self, content='', template='wagtailadmin/edit_handlers/help_panel.html',
+                 heading='', classname=''):
+        super().__init__(heading=heading, classname=classname)
+        self.content = content
+        self.template = template
+
+    def clone(self):
+        return self.__class__(
+            content=self.content,
+            template=self.template,
+            heading=self.heading,
+            classname=self.classname,
+        )
+
+    def render(self):
+        return mark_safe(render_to_string(self.template, {
+            'self': self
+        }))
+
+
 class FieldPanel(EditHandler):
     TEMPLATE_VAR = 'field_panel'
 

wagtail/admin/templates/wagtailadmin/edit_handlers/help_panel.html

@@ -0,0 +1,6 @@
+<fieldset>
+    {% if self.heading %}
+        <legend>{{ self.heading }}</legend>
+    {% endif %}
+    <div class="{{ self.classname }}">{{ self.content|safe }}</div>
+</fieldset>