Add editor over scroll

Author: yusufozgul

Sources/CodeEditTextView/CodeEditTextView.swift

@@ -27,6 +27,7 @@ public struct CodeEditTextView: NSViewControllerRepresentable {
         font: Binding<NSFont>,
         tabWidth: Binding<Int>,
         lineHeight: Binding<Double>,
+        overScrollLineCount: Binding<Int> = .constant(0),
         cursorPosition: Published<(Int, Int)>.Publisher? = nil
     ) {
         self._text = text
@@ -35,6 +36,7 @@ public struct CodeEditTextView: NSViewControllerRepresentable {
         self._font = font
         self._tabWidth = tabWidth
         self._lineHeight = lineHeight
+        self._overScrollLineCount = overScrollLineCount
         self.cursorPosition = cursorPosition
     }
 
@@ -44,6 +46,7 @@ public struct CodeEditTextView: NSViewControllerRepresentable {
     @Binding private var font: NSFont
     @Binding private var tabWidth: Int
     @Binding private var lineHeight: Double
+    @Binding private var overScrollLineCount: Int
     private var cursorPosition: Published<(Int, Int)>.Publisher?
 
     public typealias NSViewControllerType = STTextViewController
@@ -55,7 +58,8 @@ public struct CodeEditTextView: NSViewControllerRepresentable {
             font: font,
             theme: theme,
             tabWidth: tabWidth,
-            cursorPosition: cursorPosition
+            cursorPosition: cursorPosition,
+            overScrollLineCount: overScrollLineCount
         )
         controller.lineHeightMultiple = lineHeight
         return controller
@@ -67,6 +71,7 @@ public struct CodeEditTextView: NSViewControllerRepresentable {
         controller.theme = theme
         controller.tabWidth = tabWidth
         controller.lineHeightMultiple = lineHeight
+        controller.overScrollLineCount = overScrollLineCount
         controller.reloadUI()
         return
     }

Sources/CodeEditTextView/STTextViewController.swift

@@ -42,6 +42,9 @@ public class STTextViewController: NSViewController, STTextViewDelegate, ThemeAt
     /// The font to use in the `textView`
     public var font: NSFont
 
+    /// The overScrollLineCount to use for the textView over scroll
+    public var overScrollLineCount: Int
+
     // MARK: - Highlighting
 
     internal var highlighter: Highlighter?
@@ -55,14 +58,16 @@ public class STTextViewController: NSViewController, STTextViewDelegate, ThemeAt
         font: NSFont,
         theme: EditorTheme,
         tabWidth: Int,
-        cursorPosition: Published<(Int, Int)>.Publisher? = nil
+        cursorPosition: Published<(Int, Int)>.Publisher? = nil,
+        overScrollLineCount: Int
     ) {
         self.text = text
         self.language = language
         self.font = font
         self.theme = theme
         self.tabWidth = tabWidth
         self.cursorPosition = cursorPosition
+        self.overScrollLineCount = overScrollLineCount
         super.init(nibName: nil, bundle: nil)
     }
 
@@ -112,6 +117,8 @@ public class STTextViewController: NSViewController, STTextViewDelegate, ThemeAt
 
         scrollView.translatesAutoresizingMaskIntoConstraints = false
 
+        scrollView.contentInsets.bottom = Double(overScrollLineCount) * lineHeight
+
         self.view = scrollView
 
         NSLayoutConstraint.activate([
@@ -182,6 +189,8 @@ public class STTextViewController: NSViewController, STTextViewDelegate, ThemeAt
         rulerView?.separatorColor = theme.invisibles
         rulerView?.baselineOffset = baselineOffset
 
+        (view as? NSScrollView)?.contentInsets.bottom = Double(overScrollLineCount) * lineHeight
+
         setStandardAttributes()
     }