Merge pull request ppy#28387 from bdach/taiko-selection-handler-is-slow

Fix performance overhead from ternary state bindable callbacks when selection is changing

osu.Game.Rulesets.Taiko/Edit/TaikoSelectionHandler.cs

@@ -53,6 +53,9 @@ private void load()
 
         public void SetStrongState(bool state)
         {
+            if (SelectedItems.OfType<Hit>().All(h => h.IsStrong == state))
+                return;
+
             EditorBeatmap.PerformOnSelection(h =>
             {
                 if (!(h is Hit taikoHit)) return;
@@ -67,6 +70,9 @@ public void SetStrongState(bool state)
 
         public void SetRimState(bool state)
         {
+            if (SelectedItems.OfType<Hit>().All(h => h.Type == (state ? HitType.Rim : HitType.Centre)))
+                return;
+
             EditorBeatmap.PerformOnSelection(h =>
             {
                 if (h is Hit taikoHit)

osu.Game/Screens/Edit/Compose/Components/EditorSelectionHandler.cs

@@ -198,6 +198,9 @@ protected virtual void UpdateTernaryStates()
         /// <param name="bankName">The name of the sample bank.</param>
         public void AddSampleBank(string bankName)
         {
+            if (SelectedItems.All(h => h.Samples.All(s => s.Bank == bankName)))
+                return;
+
             EditorBeatmap.PerformOnSelection(h =>
             {
                 if (h.Samples.All(s => s.Bank == bankName))
@@ -214,6 +217,9 @@ public void AddSampleBank(string bankName)
         /// <param name="sampleName">The name of the hit sample.</param>
         public void AddHitSample(string sampleName)
         {
+            if (SelectedItems.All(h => h.Samples.Any(s => s.Name == sampleName)))
+                return;
+
             EditorBeatmap.PerformOnSelection(h =>
             {
                 // Make sure there isn't already an existing sample
@@ -231,6 +237,9 @@ public void AddHitSample(string sampleName)
         /// <param name="sampleName">The name of the hit sample.</param>
         public void RemoveHitSample(string sampleName)
         {
+            if (SelectedItems.All(h => h.Samples.All(s => s.Name != sampleName)))
+                return;
+
             EditorBeatmap.PerformOnSelection(h =>
             {
                 h.SamplesBindable.RemoveAll(s => s.Name == sampleName);
@@ -245,6 +254,9 @@ public void RemoveHitSample(string sampleName)
         /// <exception cref="InvalidOperationException">Throws if any selected object doesn't implement <see cref="IHasComboInformation"/></exception>
         public void SetNewCombo(bool state)
         {
+            if (SelectedItems.OfType<IHasComboInformation>().All(h => h.NewCombo == state))
+                return;
+
             EditorBeatmap.PerformOnSelection(h =>
             {
                 var comboInfo = h as IHasComboInformation;

osu.Game/Screens/Edit/EditorBeatmap.cs

@@ -198,6 +198,11 @@ public ControlPointInfo ControlPointInfo
         /// Perform the provided action on every selected hitobject.
         /// Changes will be grouped as one history action.
         /// </summary>
+        /// <remarks>
+        /// Note that this incurs a full state save, and as such requires the entire beatmap to be encoded, etc.
+        /// Very frequent use of this method (e.g. once a frame) is most discouraged.
+        /// If there is need to do so, use local precondition checks to eliminate changes that are known to be no-ops.
+        /// </remarks>
         /// <param name="action">The action to perform.</param>
         public void PerformOnSelection(Action<HitObject> action)
         {