field_expandable_add.js -- global util code

Author: SharkPool-SP

core/field_expandable_add.js

@@ -101,6 +101,31 @@ Blockly.FieldExpandableAdd.prototype.init = function() {
     this.boxGroup_
   );
   this.fieldGroup_.insertBefore(this.boxGroup_, this.textElement_);
+
+  // since this field is typicall paired with expandable_remove, no need to paste this twice
+  // inject utility code to source block
+  this.sourceBlock_.fillInBlock = function (connection, type, optValue) {
+    const srcBlock = this.sourceBlock_;
+    if (connection.sourceBlock_.isInsertionMarker_) return;
+
+    Blockly.Events.disable();
+    const block = srcBlock.workspace.newBlock(type);
+    try {
+      if (optValue) block.setFieldValue(optValue);
+      block.setShadow(true);
+      if (!srcBlock.isInsertionMarker()) {
+        block.initSvg();
+        block.render(false);
+      }
+    } finally {
+      Blockly.Events.enable();
+    }
+
+    if (Blockly.Events.isEnabled()) Blockly.Events.fire(new Blockly.Events.BlockCreate(block));
+    if (block.outputConnection) block.outputConnection.connect(connection);
+    else block.previousConnection.connect(connection);
+    return block;
+  }
 };
 
 /**