From 5ed7c07142704f574d8100ed115745cb89bd26d1 Mon Sep 17 00:00:00 2001
From: Magnus Hagander <magnus@hagander.net>
Date: Wed, 21 Aug 2024 13:32:37 +0200
Subject: [PATCH] Add a widget to show a simple treeview

---
 media/css/confadmin.css                        | 18 ++++++++++++++++++
 .../forms/widgets/treeview_widget.html         |  9 +++++++++
 postgresqleu/util/widgets.py                   | 14 ++++++++++++++
 3 files changed, 41 insertions(+)
 create mode 100644 postgresqleu/util/templates/forms/widgets/treeview_widget.html

diff --git a/media/css/confadmin.css b/media/css/confadmin.css
index 747632be..1735711c 100644
--- a/media/css/confadmin.css
+++ b/media/css/confadmin.css
@@ -177,6 +177,24 @@ a.partial-collapse:not(.collapsed):after {
     content: 'Show less';
 }
 
+/*
+ * Trivial treeview widget
+ */
+details.treeview {
+    margin-left: 1rem;
+}
+
+details.treeview summary:has(+ div) {
+    display: list-item; /* Sometimes set by bootstrap, but we override to always have it */
+    list-style-position: outside;
+    cursor: pointer;
+}
+
+
+details.treeview details.treeview {
+    margin-left: 2rem;
+}
+
 /*
  * Nested dropdown
  */
diff --git a/postgresqleu/util/templates/forms/widgets/treeview_widget.html b/postgresqleu/util/templates/forms/widgets/treeview_widget.html
new file mode 100644
index 00000000..123e3d52
--- /dev/null
+++ b/postgresqleu/util/templates/forms/widgets/treeview_widget.html
@@ -0,0 +1,9 @@
+{%load miscutil%}
+{%if treedata|isdict%}{%for k, v in treedata.items|dictsort:0 %}
+<details class="treeview"><summary>{{k}}{%if v and not v|islistordict%} ({{v}}){%endif%}</summary>{%if v|islistordict %}<div>{%include "forms/widgets/treeview_widget.html" with treedata=v%}</div>{%endif%}</details>
+{%endfor%}
+{%elif treedata|islist%}<div class="treeview">Array of:</div><div>{%for k in treedata.0 %}
+<details class="treeview withparent"><summary>{{k}}</summary></details>
+{%endfor%}
+</div>
+{%endif%}
diff --git a/postgresqleu/util/widgets.py b/postgresqleu/util/widgets.py
index 0d6e5336..9af60ebc 100644
--- a/postgresqleu/util/widgets.py
+++ b/postgresqleu/util/widgets.py
@@ -126,6 +126,20 @@ class StaticTextWidget(TextInput):
             return mark_safe(value)
 
 
+class SimpleTreeviewWidget(TextInput):
+    template_name = 'forms/widgets/treeview_widget.html'
+
+    def __init__(self, *args, **kwargs):
+        self.treedata = dict(kwargs.pop('treedata'))
+
+        super().__init__(*args, **kwargs)
+
+    def get_context(self, name, value, attrs):
+        context = super().get_context(name, value, attrs)
+        context['treedata'] = self.treedata
+        return context
+
+
 class StaticHtmlPreviewWidget(TextInput):
     template_name = 'forms/widgets/static_html_preview_widget.html'
 
-- 
2.39.5