feat: Rating range controller (#147)

* Add `NumericRatingRangeController` implementation
* Fix missing computation in `NumericRatingController`

Author: VladislavFitz

Sources/InstantSearch/Numeric/NumericRatingController.swift

@@ -15,10 +15,16 @@ public class NumericRatingController {
 
   public let ratingControl: RatingControl
 
+  var computation: Computation<Double>?
+
   public init(ratingControl: RatingControl = .init()) {
     self.ratingControl = ratingControl
   }
 
+  @objc private func ratingValueChanged(_ ratingControl: RatingControl) {
+    computation?.just(value: ratingControl.value)
+  }
+
 }
 
 extension NumericRatingController: NumberController {
@@ -28,7 +34,8 @@ extension NumericRatingController: NumberController {
   }
 
   public func setComputation(computation: Computation<Double>) {
-
+    self.computation = computation
+    ratingControl.addTarget(self, action: #selector(ratingValueChanged), for: .valueChanged)
   }
 
   public func setBounds(bounds: ClosedRange<Double>?) {
@@ -37,6 +44,10 @@ extension NumericRatingController: NumberController {
     }
   }
 
+  public func invalidate() {
+    ratingControl.value = 0
+  }
+
 }
 
 #endif

Sources/InstantSearch/Numeric/NumericRatingRangeController.swift

@@ -0,0 +1,43 @@
+//
+//  NumericRatingRangeController.swift
+//
+//
+//  Created by Vladislav Fitc on 04/11/2020.
+//
+
+#if !InstantSearchCocoaPods
+import InstantSearchCore
+#endif
+#if canImport(UIKit) && (os(iOS) || os(macOS))
+import UIKit
+
+public class NumericRatingRangeController {
+
+  public let ratingControl: RatingControl
+
+  public var onRangeChanged: ((ClosedRange<Double>) -> Void)?
+
+  public init(ratingControl: RatingControl = .init()) {
+    self.ratingControl = ratingControl
+    ratingControl.addTarget(self, action: #selector(ratingValueChanged), for: .valueChanged)
+  }
+
+  @objc private func ratingValueChanged(_ ratingControl: RatingControl) {
+    onRangeChanged?(ratingControl.value...Double(ratingControl.maximumValue))
+  }
+
+}
+
+extension NumericRatingRangeController: NumberRangeController {
+
+  public func setBounds(_ bounds: ClosedRange<Double>) {
+    ratingControl.maximumValue = Int(bounds.upperBound)
+  }
+
+  public func setItem(_ item: ClosedRange<Double>) {
+    ratingControl.value = item.lowerBound
+  }
+
+}
+
+#endif