From 1aa1186fc8bb25b62f131ddae3cd917d8d6ed3d4 Mon Sep 17 00:00:00 2001
From: jschanker <jschanker@molloy.edu>
Date: Sun, 20 Jun 2021 00:41:59 -0400
Subject: [PATCH] Permit single field disabling
 (https://github.com/google/blockly/issues/4932)

---
 core/field.js | 40 ++++++++++++++++++++++++++++++++++------
 1 file changed, 34 insertions(+), 6 deletions(-)

diff --git a/core/field.js b/core/field.js
index 9d52bacbb..5547d73bf 100644
--- a/core/field.js
+++ b/core/field.js
@@ -202,6 +202,13 @@ Blockly.Field.prototype.isDirty_ = true;
  */
 Blockly.Field.prototype.visible_ = true;
 
+/**
+ * Can the field value be changed using the editor on an editable block?
+ * @type {boolean}
+ * @protected
+ */
+Blockly.Field.prototype.enabled_ = true;
+
 /**
  * The element the click handler is bound to.
  * @type {Element}
@@ -440,7 +447,7 @@ Blockly.Field.prototype.updateEditable = function() {
   if (!this.EDITABLE || !group) {
     return;
   }
-  if (this.sourceBlock_.isEditable()) {
+  if (this.enabled_ && this.sourceBlock_.isEditable()) {
     Blockly.utils.dom.addClass(group, 'blocklyEditableText');
     Blockly.utils.dom.removeClass(group, 'blocklyNonEditableText');
     group.style.cursor = this.CURSOR;
@@ -451,23 +458,44 @@ Blockly.Field.prototype.updateEditable = function() {
   }
 };
 
+/**
+ * Set whether this field's value can be changed using the editor when the
+ * source block is editable.
+ * @param {boolean} enabled True if enabled.
+ */
+Blockly.Field.prototype.setEnabled = function(enabled) {
+  this.enabled_ = enabled;
+  this.updateEditable();
+};
+
+/**
+ * Check whether this field's value can be changed using the editor when the
+ * source block is editable.
+ * @return {boolean} Whether this field is enabled.
+ */
+Blockly.Field.prototype.isEnabled = function() {
+  return this.enabled_;
+};
+
 /**
  * Check whether this field defines the showEditor_ function.
  * @return {boolean} Whether this field is clickable.
  */
 Blockly.Field.prototype.isClickable = function() {
-  return !!this.sourceBlock_ && this.sourceBlock_.isEditable() &&
-      !!this.showEditor_ && (typeof this.showEditor_ === 'function');
+  return this.enabled_ && !!this.sourceBlock_ && this.sourceBlock_.isEditable()
+      && !!this.showEditor_ && (typeof this.showEditor_ === 'function');
 };
 
 /**
  * Check whether this field is currently editable.  Some fields are never
  * EDITABLE (e.g. text labels). Other fields may be EDITABLE but may exist on
- * non-editable blocks.
- * @return {boolean} Whether this field is editable and on an editable block
+ * non-editable blocks or be currently disabled.
+ * @return {boolean} Whether this field is currently enabled, editable and on
+ * an editable block.
  */
 Blockly.Field.prototype.isCurrentlyEditable = function() {
-  return this.EDITABLE && !!this.sourceBlock_ && this.sourceBlock_.isEditable();
+  return this.enabled_ && this.EDITABLE && !!this.sourceBlock_ &&
+      this.sourceBlock_.isEditable();
 };
 
 /**