Hide delta V UI when the stock delta V app/calculations are disabled.

GameData/KSPCommunityFixes/Settings.cfg

@@ -74,6 +74,12 @@ KSP_COMMUNITY_FIXES
   // Fix deployable parts (antennas, solar panels, radiators...) always starting in the extended 
   // state when the model isn't exported in the retracted state. Affect parts from various mods.
   ExtendedDeployableParts = true
+
+  // Fix the delta V data (and info panels) on stage UI elements showing
+  // when the delta V app and delta V calculations are disabled.
+  // Also hide extended burn time info on the navball in this case, because
+  // it depends on the stock delta V implementation.
+  DeltaVHideWhenDisabled = true
 
   // ##########################
   // Obsolete bugfixes

KSPCommunityFixes/BugFixes/DeltaVHideWhenDisabled.cs

@@ -0,0 +1,113 @@
+using System;
+using System.Collections.Generic;
+using HarmonyLib;
+using KSP.UI.Screens;
+using KSP.UI.Screens.Flight;
+
+namespace KSPCommunityFixes
+{
+    public class DeltaVHideWhenDisabled : BasePatch
+    {
+        protected override Version VersionMin => new Version(1, 12, 0);
+
+        protected static bool extendedBurntimeCache;
+
+        protected override void ApplyPatches(ref List<PatchInfo> patches)
+        {
+            patches.Add(new PatchInfo(
+                PatchMethodType.Postfix,
+                AccessTools.Method(typeof(StageGroup), "Awake"),
+                this));
+
+            patches.Add(new PatchInfo(
+                PatchMethodType.Postfix,
+                AccessTools.Method(typeof(StageManager), "Awake"),
+                this));
+
+            patches.Add(new PatchInfo(
+                PatchMethodType.Prefix,
+                AccessTools.Method(typeof(StageGroup), "ToggleInfoPanel", new Type[] { typeof(bool) }),
+                this));
+
+            patches.Add(new PatchInfo(
+                PatchMethodType.Prefix,
+                AccessTools.Method(typeof(NavBallBurnVector), "onGameSettingsApplied"),
+                this));
+
+            patches.Add(new PatchInfo(
+                PatchMethodType.Postfix,
+                AccessTools.Method(typeof(NavBallBurnVector), "onGameSettingsApplied"),
+                this));
+
+            patches.Add(new PatchInfo(
+                PatchMethodType.Prefix,
+                AccessTools.Method(typeof(NavBallBurnVector), "LateUpdate"),
+                this));
+
+            patches.Add(new PatchInfo(
+                PatchMethodType.Postfix,
+                AccessTools.Method(typeof(NavBallBurnVector), "LateUpdate"),
+                this));
+        }
+
+        static void StageGroup_Awake_Postfix(StageGroup __instance)
+        {
+            if (GameSettings.DELTAV_APP_ENABLED == false && GameSettings.DELTAV_CALCULATIONS_ENABLED == false)
+            {
+                __instance.DisableDeltaVHeading();
+            }
+        }
+
+        static void StageManager_Awake_Postfix(StageManager __instance)
+        {
+            if (GameSettings.DELTAV_APP_ENABLED == false && GameSettings.DELTAV_CALCULATIONS_ENABLED == false)
+            {
+                // Note: not using __instance here because the singleton pattern
+                // destroys the new object in favor of the old, if Instance
+                // is non-null during Awake.
+                StageManager.Instance.DisableDeltaVTotal();
+                StageManager.Instance.deltaVTotalButton.gameObject.SetActive(false);
+            }
+        }
+
+        static bool StageGroup_ToggleInfoPanel_Prefix(ref bool showPanel, StageGroup __instance)
+        {
+            // If we don't have delta V enabled, just short-circuit any attempt to toggle the info panel.
+            if (showPanel && GameSettings.DELTAV_APP_ENABLED == false && GameSettings.DELTAV_CALCULATIONS_ENABLED == false)
+                return false;
+
+            // but Just In Case let it close.
+            return true;
+        }
+
+        static bool NavBallBurnVector_onGameSettingsApplied_Prefix(NavBallBurnVector __instance)
+        {
+            extendedBurntimeCache = GameSettings.EXTENDED_BURNTIME;
+
+            if (GameSettings.DELTAV_APP_ENABLED == false && GameSettings.DELTAV_CALCULATIONS_ENABLED == false)
+                GameSettings.EXTENDED_BURNTIME = false;
+
+            return true;
+        }
+
+        static void NavBallBurnVector_onGameSettingsApplied_Postfix(NavBallBurnVector __instance)
+        {
+            GameSettings.EXTENDED_BURNTIME = extendedBurntimeCache;
+        }
+
+        static bool NavBallBurnVector_LateUpdate_Prefix(NavBallBurnVector __instance)
+        {
+            extendedBurntimeCache = GameSettings.EXTENDED_BURNTIME;
+
+            if (GameSettings.DELTAV_APP_ENABLED == false && GameSettings.DELTAV_CALCULATIONS_ENABLED == false)
+                GameSettings.EXTENDED_BURNTIME = false;
+
+            return true;
+        }
+
+        static void NavBallBurnVector_LateUpdate_Postfix(NavBallBurnVector __instance)
+        {
+            GameSettings.EXTENDED_BURNTIME = extendedBurntimeCache;
+        }
+    }
+}

KSPCommunityFixes/KSPCommunityFixes.csproj

@@ -75,6 +75,7 @@
     <Compile Include="BugFixes\AutoStrutDrift.cs" />
     <Compile Include="BugFixes\DockingPortRotationDriftAndFixes.cs" />
     <Compile Include="BugFixes\ExtendedDeployableParts.cs" />
+    <Compile Include="BugFixes\DeltaVHideWhenDisabled.cs" />
     <Compile Include="BugFixes\KerbalTooltipMaxSustainedG.cs" />
     <Compile Include="BugFixes\PackedPartsRotation.cs" />
     <Compile Include="BugFixes\PartStartStability.cs" />