Creating method in ModUtils to calculate the rate for the song

osu.Game/Beatmaps/Drawables/DifficultyIconTooltip.cs

@@ -13,6 +13,7 @@ using osu.Game.Graphics;
 using osu.Game.Graphics.Sprites;
 using osu.Game.Rulesets;
 using osu.Game.Rulesets.Mods;
+using osu.Game.Utils;
 using osuTK;
 
 namespace osu.Game.Beatmaps.Drawables
@@ -123,13 +124,7 @@ namespace osu.Game.Beatmaps.Drawables
             difficultyFillFlowContainer.Show();
             miscFillFlowContainer.Show();
 
-            double rate = 1;
+            double rate = ModUtils.CalculateRateWithMods(displayedContent.Mods);
-
-            if (displayedContent.Mods != null)
-            {
-                foreach (var mod in displayedContent.Mods.OfType<IApplicableToRate>())
-                    rate = mod.ApplyToRate(0, rate);
-            }
 
             double bpmAdjusted = displayedContent.BeatmapInfo.BPM * rate;
 

osu.Game/Online/Rooms/PlaylistExtensions.cs

@@ -8,6 +8,7 @@ using Humanizer;
 using Humanizer.Localisation;
 using osu.Framework.Bindables;
 using osu.Game.Rulesets.Mods;
+using osu.Game.Utils;
 
 namespace osu.Game.Online.Rooms
 {
@@ -40,17 +41,14 @@ namespace osu.Game.Online.Rooms
                 : GetUpcomingItems(playlist).First();
         }
 
+        /// <summary>
+        /// Returns the total duration from the <see cref="PlaylistItem"/> in playlist order from the supplied <paramref name="playlist"/>,
+        /// </summary>
         public static string GetTotalDuration(this BindableList<PlaylistItem> playlist) =>
             playlist.Select(p =>
             {
                 var ruleset = p.Beatmap.Ruleset.CreateInstance();
-                double rate = 1;
+                double rate = ModUtils.CalculateRateWithMods(p.RequiredMods.Select(mod => mod.ToMod(ruleset)).ToList());
-                if (p.RequiredMods.Count() > 0)
-                {
-                    List<Mod> mods = p.RequiredMods.Select(mod => mod.ToMod(ruleset)).ToList();
-                    foreach (var mod in mods.OfType<IApplicableToRate>())
-                        rate = mod.ApplyToRate(0, rate);
-                }
                 return p.Beatmap.Length / rate;
             }).Sum().Milliseconds().Humanize(minUnit: TimeUnit.Second, maxUnit: TimeUnit.Hour, precision: 2);
     }

osu.Game/Overlays/Mods/BeatmapAttributesDisplay.cs

@@ -165,9 +165,7 @@ namespace osu.Game.Overlays.Mods
                     starRatingDisplay.FinishTransforms(true);
             });
 
-            double rate = 1;
+            double rate = ModUtils.CalculateRateWithMods(Mods.Value.ToList());
-            foreach (var mod in Mods.Value.OfType<IApplicableToRate>())
-                rate = mod.ApplyToRate(0, rate);
 
             bpmDisplay.Current.Value = FormatUtils.RoundBPM(BeatmapInfo.Value.BPM, rate);
 

osu.Game/Screens/Select/BeatmapInfoWedge.cs

@@ -402,9 +402,7 @@ namespace osu.Game.Screens.Select
                     return;
 
                 // this doesn't consider mods which apply variable rates, yet.
-                double rate = 1;
+                double rate = ModUtils.CalculateRateWithMods(mods.Value.ToList());
-                foreach (var mod in mods.Value.OfType<IApplicableToRate>())
-                    rate = mod.ApplyToRate(0, rate);
 
                 int bpmMax = FormatUtils.RoundBPM(beatmap.ControlPointInfo.BPMMaximum, rate);
                 int bpmMin = FormatUtils.RoundBPM(beatmap.ControlPointInfo.BPMMinimum, rate);

osu.Game/Screens/Select/Details/AdvancedStats.cs

@@ -27,6 +27,7 @@ using osu.Game.Configuration;
 using osu.Game.Resources.Localisation.Web;
 using osu.Game.Rulesets;
 using osu.Game.Overlays.Mods;
+using osu.Game.Utils;
 
 namespace osu.Game.Screens.Select.Details
 {
@@ -179,9 +180,7 @@ namespace osu.Game.Screens.Select.Details
 
                 if (Ruleset.Value != null)
                 {
-                    double rate = 1;
+                    double rate = ModUtils.CalculateRateWithMods(mods.Value);
-                    foreach (var mod in mods.Value.OfType<IApplicableToRate>())
-                        rate = mod.ApplyToRate(0, rate);
 
                     adjustedDifficulty = Ruleset.Value.CreateInstance().GetRateAdjustedDisplayDifficulty(originalDifficulty, rate);
 

osu.Game/Utils/ModUtils.cs

@@ -276,5 +276,21 @@ namespace osu.Game.Utils
 
             return scoreMultiplier.ToLocalisableString("0.00x");
         }
+
+        /// <summary>
+        /// Calculate the rate for the song with the selected mods.
+        /// </summary>
+        /// <param name="mods">The list of selected mods.</param>
+        /// <returns>The rate with mods.</returns>
+        public static double CalculateRateWithMods(IEnumerable<Mod> mods)
+        {
+            double rate = 1;
+            if (mods != null)
+            {
+                foreach (var mod in mods.OfType<IApplicableToRate>())
+                    rate = mod.ApplyToRate(0, rate);
+            }
+            return rate;
+        }
     }
 }