move showContextMenu to extension

lib/helpers/extensions/show_context_menu.dart

@@ -0,0 +1,35 @@
+import "package:flutter/material.dart";
+
+extension ShowContextMenu on BuildContext {
+  void showContextMenu({
+    required Offset globalPosition,
+    required VoidCallback onTap,
+  }) {
+    final overlay = Overlay.of(this).context.findRenderObject() as RenderBox;
+
+    showMenu(
+      context: this,
+      position: RelativeRect.fromLTRB(
+        globalPosition.dx,
+        globalPosition.dy,
+        overlay.size.width - globalPosition.dx,
+        overlay.size.height - globalPosition.dy,
+      ),
+      color: Theme.of(this).colorScheme.surfaceContainerHighest,
+      items: [
+        PopupMenuItem(
+          onTap: onTap,
+          child: ListTile(leading: Icon(Icons.reply), title: Text("Reply")),
+        ),
+        PopupMenuItem(
+          onTap: onTap,
+          child: ListTile(leading: Icon(Icons.edit), title: Text("Edit")),
+        ),
+        PopupMenuItem(
+          onTap: onTap,
+          child: ListTile(leading: Icon(Icons.delete), title: Text("Delete")),
+        ),
+      ],
+    );
+  }
+}