scrollbar on wall-of-texts

src/net/torvald/terrarum/ui/UIItemHorzSlider.kt

@@ -106,5 +106,16 @@ class UIItemHorzSlider(
         if (disposeTexture) backgroundTexture?.texture?.tryDispose()
     }
 
+    fun scrolledForce(amountX: Float, amountY: Float): Boolean {
+        val scroll = if (amountY == 0f) amountX else if (amountX == 0f) amountY else (amountX + amountY) / 2f
 
+        val move = Math.round(scroll)
+        val newValue = (value + move).coerceIn(min, max)
+
+        handlePos = interpolateLinear(newValue / max, 0.0, handleTravelDist.toDouble())
+        value = newValue
+        selectionChangeListener(value)
+
+        return true
+    }
 }