Support disabling touches via allowsHitTesting (#294)

CHANGELOG.md

@@ -4,7 +4,12 @@ All notable changes to this project are documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased](https://github.com/airbnb/HorizonCalendar/compare/v1.16.0...HEAD)
+## [Unreleased](https://github.com/airbnb/HorizonCalendar/compare/v2.0.0...HEAD)
+
+### Added
+- Added support for disabling touch handling on SwiftUI views via the `allowsHitTesting` modifier
+
+## [v2.0.0](https://github.com/airbnb/HorizonCalendar/compare/v1.16.0...v2.0.0) - 2023-12-19
 
 ### Added
 - Added `MonthsLayout.vertical` and `MonthsLayout.horizontal` as more concise alternatives to `MonthsLayout.vertical(options: .init())` and `MonthsLayout.horizontal(options: .init())`, respectively

Sources/Public/CalendarView.swift

@@ -1016,16 +1016,14 @@ public final class CalendarView: UIView {
   }
 
   private func updateSelectedDayRange(gestureRecognizer: UIGestureRecognizer) {
-    let locationInScrollView = gestureRecognizer.location(in: scrollView)
-
     // Find the intersected day
     var intersectedDay: Day?
     for subview in scrollView.subviews {
       guard
         !subview.isHidden,
         let itemView = subview as? ItemView,
         case .layoutItemType(.day(let day)) = itemView.itemType,
-        itemView.frame.contains(locationInScrollView)
+        itemView.hitTest(gestureRecognizer.location(in: itemView), with: nil) != nil
       else {
         continue
       }

Sources/Public/ItemViews/SwiftUIWrapperView.swift

@@ -60,6 +60,20 @@ public final class SwiftUIWrapperView<Content: View>: UIView {
     }
   }
 
+  public override func point(inside point: CGPoint, with event: UIEvent?) -> Bool {
+    // `_UIHostingView`'s `isUserInteractionEnabled` is not affected by the `allowsHitTesting`
+    // modifier. Its first subview's `isUserInteractionEnabled` _does_ appear to be affected by the
+    // `allowsHitTesting` modifier, enabling us to properly ignore touch handling.
+    if
+      let firstSubview = hostingController.view.subviews.first,
+      !firstSubview.isUserInteractionEnabled
+    {
+      return false
+    } else {
+      return super.point(inside: point, with: event)
+    }
+  }
+
   public override func layoutSubviews() {
     super.layoutSubviews()
     hostingControllerView?.frame = bounds