Fix scrollbars on Menu/MessageBox

src/Editor/Menu.php

@@ -20,8 +20,8 @@ class Menu
     const U_EDGE_HORIZONTAL = "\u{2500}";
 
     const U_EDGE_VERTICAL = "\u{2502}";
-    const U_EDGE_VERTICAL_SCROLL = "\u{250a}";
-    const U_EDGE_VERTICAL_THUMB = "\u{2503}";
+    const U_EDGE_VERTICAL_SCROLL = "\u{2591}";
+    const U_EDGE_VERTICAL_THUMB = "\u{2593}";
     const U_EDGE_VERTICAL_LEFT = "\u{2524}";
     const U_EDGE_VERTICAL_RIGHT = "\u{251c}";
 
@@ -29,13 +29,55 @@ class Menu
 
     private int $scroll = 0;
 
+    /**
+     * constructor
+     *
+     * @param Terminal $terminal
+     * @param array $items
+     * @param string $title
+     */
     public function __construct(private Terminal $terminal, private array $items, private string $title = 'Menu')
     {
 
     }
 
+    /**
+     * Update the menu items
+     *
+     * @param array $items
+     * @return self
+     */
+    public function setItems(array $items): self
+    {
+        $this->items = $items;
+        return $this;
+    }
+
+    /**
+     * Set the menu title
+     *
+     * @param string $title
+     * @return self
+     */
+    public function setTitle(string $title): self
+    {
+        $this->title = $title;
+        return $this;
+    }
+
+    /**
+     * Display the menu
+     *
+     * @param int $left
+     * @param int $top
+     * @param int $width
+     * @param int $height
+     * @param string|int|null $value
+     * @return mixed
+     */
     public function display(int $left, int $top, int $width, int $height = 0, string|int|null $value): mixed
     {
+        $this->index = 0;
 
         [$w,$h] = $this->terminal->getSize();
         if ($height == 0) {
@@ -80,6 +122,15 @@ class Menu
         return null;
     }
 
+    /**
+     * Redraw menu
+     *
+     * @param int $left
+     * @param int $top
+     * @param int $width
+     * @param int $height
+     * @return void
+     */
     private function redraw(int $left, int $top, int $width, int $height) {
 
         $visibleItems = $height - 2;
@@ -93,10 +144,9 @@ class Menu
         }
 
         $scrollTop = $this->scroll;
-        $scrollVisible = $visibleItems / count($this->items); // / $visibleItems;
-        $scrollBottom = $scrollTop + $scrollVisible;
-        $thumbTop = round($scrollTop * $visibleItems);
-        $thumbBottom = round($visibleItems * $scrollBottom);
+        $scrollBottom = $scrollTop + $visibleItems - 1;
+        $thumbTop = round(($visibleItems - 1) / count($this->items) * $scrollTop);
+        $thumbBottom = round(($visibleItems - 1) / count($this->items) * $scrollBottom);
 
         $tleft = round(($width / 2) - ((mb_strlen($this->title) + 2) / 2));
 
@@ -135,6 +185,12 @@ class Menu
         echo "\e[0m";
     }
 
+    /**
+     * Calculate item length without markup
+     *
+     * @param string $item
+     * @return int
+     */
     private function itemlen(string $item): int
     {
         $item = preg_replace('<\e\[.+?m>', '', $item);