Adds custom spacing to lists

Shared/Examples/ListExampleFactory.swift

@@ -41,6 +41,27 @@ class ListExampleFactory: ExampleFactory {
         document.add(list: featureList)
 
         document.add(space: 20)
+
+        // Simple bullet point list with custom spacing
+        let customSpacingList = PDFList(indentations: [
+            (pre: 10.0, past: 20.0),
+            (pre: 20.0, past: 20.0),
+            (pre: 40.0, past: 20.0)
+        ])
+
+        //A custom spacing can be setup, this property is optional
+        customSpacingList.spacing = 16
+
+        // By adding the item first to a list item with the dot symbol, all of them will inherit it
+        customSpacingList
+            .addItem(PDFListItem(symbol: .dot)
+                .addItems(items.map({ item in
+                    PDFListItem(content: item)
+                })))
+        document.add(list: customSpacingList)
+
+        document.add(space: 20)
+
 
         // Numbered list with unusual indentation
         let weirdIndentationList = PDFList(indentations: [

Source/API/List/PDFList.swift

@@ -16,6 +16,7 @@ import AppKit
  */
 public class PDFList: PDFDocumentObject {
 
+    public var spacing: CGFloat?
     /**
      TODO: Documentation
      */

Source/Internal/List/PDFListObject.swift

@@ -42,11 +42,22 @@
             result += try createTextItem(generator: generator, container: container, text: item.text)
 
             generator.layout.indentation.setLeft(indentation: originalLeftIndent, in: container)
+            handleCustomInterItemSpacing(item: item, generator: generator, container: container)
         }
 
         return result
     }
-
+
+    private func handleCustomInterItemSpacing(item: (level: Int, text: String, symbol: PDFListItemSymbol), generator: PDFGenerator, container: PDFContainer) {
+        guard let interItemSpacing = list.spacing,
+              let lastItem = list.flatted().last,
+              item != lastItem else {
+            //No need to add a space if it's the last item or no spacing has been defined
+            return
+        }
+        generator.layout.heights.add(interItemSpacing, to: container)
+    }
+
     /**
      TODO: Documentation
      */