Add option to hide the histogram when the inventory is closed

src/main/java/com/histogram/HistogramConfig.java

@@ -39,6 +39,18 @@ public interface HistogramConfig extends Config
 	)
 	String advancedSection = "Advanced";
 
+	@ConfigItem(
+			keyName = "hidewheninventoryclosed",
+			name = "Hide When Inventory Closed",
+			description = "Hide the histogram whenever the inventory panel is hidden, so it comes and goes with the rest of the interface",
+			section = panelSection,
+			position = -1
+	)
+	default boolean hideWhenInventoryClosed()
+	{
+		return false;
+	}
+
 	@ConfigItem(
 			keyName = "panelsize",
 			name = "Panel size",

src/main/java/com/histogram/HistogramOverlay.java

@@ -1,5 +1,8 @@
 package com.histogram;
 
+import net.runelite.api.Client;
+import net.runelite.api.gameval.InterfaceID;
+import net.runelite.api.widgets.Widget;
 import net.runelite.client.ui.overlay.Overlay;
 import java.awt.*;
 import java.util.*;
@@ -26,12 +29,15 @@ private class Event
 
     private HistogramConfig config;
 
+    private Client client;
+
     private long lastnano;
     private float delta;
 
-    HistogramOverlay(HistogramConfig config)
+    HistogramOverlay(HistogramConfig config, Client client)
     {
         this.config = config;
+        this.client = client;
 
         events = new ArrayDeque<>();
         lastnano = System.nanoTime();
@@ -61,16 +67,30 @@ public void addEvent(EventType type, float pingdelay, float serverdelay)
 
     @Override
     public Dimension render(Graphics2D graphics) {
+        // Age and prune events even while hidden, so the deque doesn't grow
+        // unbounded and `delta` doesn't spike on the frame the panel returns.
+        updateDelta();
+        updateEvents();
+
+        if (config.hideWhenInventoryClosed() && isInventoryHidden())
+        {
+            return null;
+        }
+
         graphics.setColor(config.bgColor());
         graphics.fillRect(0, 0, config.panelSize().width, config.panelSize().height);
 
-        updateDelta();
-        updateEvents();
         drawEvents(graphics);
 
         return config.panelSize();
     }
 
+    private boolean isInventoryHidden()
+    {
+        Widget inventory = client.getWidget(InterfaceID.Inventory.ITEMS);
+        return inventory == null || inventory.isHidden();
+    }
+
     private void drawEvents(Graphics2D graphics)
     {
         for (Event event : events)

src/main/java/com/histogram/HistogramPlugin.java

@@ -48,7 +48,7 @@ public class HistogramPlugin extends Plugin
 	@Override
 	protected void startUp() throws Exception
 	{
-		histogramOverlay = new HistogramOverlay(config);
+		histogramOverlay = new HistogramOverlay(config, client);
 		overlayManager.add(histogramOverlay);
 
 		pingThreads = Executors.newScheduledThreadPool(20);