RapidTravel impr, GoBack/Forward, header navigation

src/Library/DeclarativeProperty/DebounceProperty.cs

@@ -3,7 +3,7 @@
 public sealed class DebounceProperty<T> : DeclarativePropertyBase<T>
 {
     private readonly object _lock = new();
-    private readonly Func<TimeSpan> _interval;
+    private readonly Func<T?, TimeSpan> _interval;
     private DateTime _startTime = DateTime.MinValue;
     private T? _nextValue;
     private CancellationToken _nextCancellationToken;
@@ -13,7 +13,7 @@ public sealed class DebounceProperty<T> : DeclarativePropertyBase<T>
 
     public DebounceProperty(
         IDeclarativeProperty<T> from,
-        Func<TimeSpan> interval,
+        Func<T?, TimeSpan> interval,
         Action<T?>? setValueHook = null) : base(from.Value, setValueHook)
     {
         _interval = interval;
@@ -46,7 +46,7 @@ public sealed class DebounceProperty<T> : DeclarativePropertyBase<T>
 
     private async Task StartDebounceTask()
     {
-        while (DateTime.Now - _startTime < _interval())
+        while (DateTime.Now - _startTime < _interval(_nextValue))
         {
             await Task.Delay(WaitInterval);
         }

src/Library/DeclarativeProperty/DeclarativeProperty.cs

@@ -16,6 +16,9 @@ public static class DeclarativePropertyHelpers
         Func<T1, T2, T3, Task<TResult>> func,
         Action<TResult?>? setValueHook = null)
         => new(prop1, prop2, prop3, func, setValueHook);
+    
+    public static MergeProperty<T> Merge<T>(params IDeclarativeProperty<T>[] props)
+        => new(props);
 }
 
 public sealed class DeclarativeProperty<T> : DeclarativePropertyBase<T>

src/Library/DeclarativeProperty/DeclarativePropertyExtensions.cs

@@ -7,9 +7,9 @@ namespace DeclarativeProperty;
 public static class DeclarativePropertyExtensions
 {
     public static IDeclarativeProperty<T> Debounce<T>(this IDeclarativeProperty<T> from, TimeSpan interval, bool resetTimer = false)
-        => new DebounceProperty<T>(from, () => interval) {ResetTimer = resetTimer};
+        => new DebounceProperty<T>(from, _ => interval) {ResetTimer = resetTimer};
 
-    public static IDeclarativeProperty<T> Debounce<T>(this IDeclarativeProperty<T> from, Func<TimeSpan> interval, bool resetTimer = false)
+    public static IDeclarativeProperty<T> Debounce<T>(this IDeclarativeProperty<T> from, Func<T?, TimeSpan> interval, bool resetTimer = false)
         => new DebounceProperty<T>(from, interval) {ResetTimer = resetTimer};
 
     public static IDeclarativeProperty<T> Throttle<T>(this IDeclarativeProperty<T> from, TimeSpan interval)

src/Library/DeclarativeProperty/MergeProperty.cs

@@ -0,0 +1,17 @@
+namespace DeclarativeProperty;
+
+public class MergeProperty<T> : DeclarativePropertyBase<T>
+{
+    public MergeProperty(params IDeclarativeProperty<T>[] props)
+    {
+        ArgumentNullException.ThrowIfNull(props);
+
+        foreach (var prop in props)
+        {
+            prop.Subscribe(UpdateAsync);
+        }
+    }
+
+    private async Task UpdateAsync(T? newValue, CancellationToken token)
+        => await SetNewValueAsync(newValue, token);
+}