1 files changed, 53 insertions, 0 deletions
diff --git a/Scripts/OutputContainer.cs b/Scripts/OutputContainer.cs
new file mode 100644
index 0000000..d5a5bea
--- /dev/null
+++ b/Scripts/OutputContainer.cs
@@ -0,0 +1,53 @@
+using System.Linq;
+using Godot;
+
+namespace Texty.Scripts
+{
+    public abstract class OutputContainer : PanelContainer
+    {
+        private double _lastScrollLimit;
+
+        private VScrollBar _scrollBar;
+
+        [Export(PropertyHint.Range, "10,40,1")]
+        public int MaximumRows = 20;
+
+        public VBoxContainer OutputRows;
+        public ScrollContainer ScrollContainer;
+
+        public override void _Ready()
+        {
+            ScrollContainer = GetNode<ScrollContainer>(nameof(ScrollContainer));
+            _scrollBar = ScrollContainer.GetVScrollbar();
+            OutputRows = ScrollContainer.GetNode<VBoxContainer>(nameof(OutputRows));
+
+            _lastScrollLimit = _scrollBar.MaxValue;
+            _scrollBar.Connect("changed", this, nameof(OnScrollLimitChanged));
+        }
+
+        public void Add(OutputRow row)
+        {
+            OutputRows.AddChild(row);
+            ExpungeOldRows();
+        }
+
+        public void OnScrollLimitChanged()
+        {
+            if (!(_lastScrollLimit < _scrollBar.MaxValue)) return;
+            _lastScrollLimit = _scrollBar.MaxValue;
+            ScrollContainer.ScrollVertical = (int)_scrollBar.MaxValue;
+        }
+
+        private void ExpungeOldRows()
+        {
+            GD.Range(OutputRows.GetChildCount() - MaximumRows)
+                .Select(idx => OutputRows.GetChild(idx))
+                .ToList()
+                .ForEach(row =>
+                {
+                    OutputRows.RemoveChild(row);
+                    row.QueueFree();
+                });
+        }
+    }
+}
+\ No newline at end of file