fix(android): Parent view steals map pan gesture

[ottor-o]

Pull request

Please ensure this PR targets the dev branch and follows the project conventions.
CI already runs linting, formatting, and build checks automatically.

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Before submitting

• This PR targets the dev branch (not main)
• Commit messages follow the semantic-release format
• No debug logs or sensitive data included

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Summary

This fixes an issue where parent PagerView (and ScrollView?) steals MapView's pan gesture.

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Type of change

• Feature
• Fix
• Refactor
• Internal / CI
• Documentation

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Scope

• Android
• iOS
• JS
• Example App
• Docs

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Related

List any related issues, pull requests, or discussions.
Use the format:
Fixes #123, Refs #456, Close #789

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Additional notes

If you have a map inside a PagerView (and ScrollView?) with touch events enabled, they override MapView's pan gesture. The expected behaviour is to be able to pan the map normally. This is the current behaviour on iOS.

[pinpong]

Thanks for the PR,
that approach only handles down/up and doesn’t account for multi-touch or re-interception during move, which makes pinch/rotate unreliable in nested scroll containers.
This patch handles interception based on pointer count and keeps gestures stable, matching the expected iOS behavior on Android. We should also keep an eye on possible side effects of touch interception changes in complex layouts.

diff --git a/android/src/main/java/com/rngooglemapsplus/GoogleMapsViewImpl.kt b/android/src/main/java/com/rngooglemapsplus/GoogleMapsViewImpl.kt
index 25339a8..b9953ff 100644
--- a/android/src/main/java/com/rngooglemapsplus/GoogleMapsViewImpl.kt
+++ b/android/src/main/java/com/rngooglemapsplus/GoogleMapsViewImpl.kt
@@ -10,6 +10,7 @@ import android.content.res.Configuration
 import android.graphics.Bitmap
 import android.location.Location
 import android.util.Size
+import android.view.MotionEvent
 import android.view.View
 import android.widget.FrameLayout
 import androidx.lifecycle.Lifecycle
@@ -106,6 +107,7 @@ class GoogleMapsViewImpl(
   private val urlTileOverlaysById = mutableMapOf<String, TileOverlay>()
 
   private var cameraMoveReason = -1
+  private var parentTouchInterceptDisallowed = false
 
   val componentCallbacks =
     object : ComponentCallbacks2 {
@@ -181,6 +183,52 @@ class GoogleMapsViewImpl(
         }
     }
 
+  private fun setParentTouchInterceptDisallowed(blocked: Boolean) {
+    if (parentTouchInterceptDisallowed == blocked) return
+    parentTouchInterceptDisallowed = blocked
+    var p = parent
+    while (p != null) {
+      p.requestDisallowInterceptTouchEvent(blocked)
+      p = p.parent
+    }
+  }
+
+  override fun dispatchTouchEvent(ev: MotionEvent): Boolean {
+    val panEnabled = uiSettings?.scrollEnabled == true
+    val zoomEnabled = uiSettings?.zoomGesturesEnabled == true
+    val rotateEnabled = uiSettings?.rotateEnabled == true
+    val tiltEnabled = uiSettings?.tiltEnabled == true
+
+    val multiTouchEnabled = zoomEnabled || rotateEnabled || tiltEnabled
+    val anyMapGestureEnabled = panEnabled || multiTouchEnabled
+    if (!anyMapGestureEnabled) return super.dispatchTouchEvent(ev)
+
+    when (ev.actionMasked) {
+      MotionEvent.ACTION_DOWN,
+      MotionEvent.ACTION_MOVE,
+      MotionEvent.ACTION_POINTER_DOWN,
+      -> {
+        val pointers = ev.pointerCount
+        val shouldBlockParent = pointers >= (if (panEnabled) 1 else 2)
+        setParentTouchInterceptDisallowed(shouldBlockParent)
+      }
+
+      MotionEvent.ACTION_POINTER_UP -> {
+        val pointers = ev.pointerCount - 1
+        val shouldBlockParent = pointers >= (if (panEnabled) 1 else 2)
+        setParentTouchInterceptDisallowed(shouldBlockParent)
+      }
+
+      MotionEvent.ACTION_UP,
+      MotionEvent.ACTION_CANCEL,
+      -> {
+        setParentTouchInterceptDisallowed(false)
+      }
+    }
+
+    return super.dispatchTouchEvent(ev)
+  }
+
   override fun onCameraMoveStarted(reason: Int) =
     onUi {
       if (!mapViewLoaded) return@onUi
@@ -875,6 +923,7 @@ class GoogleMapsViewImpl(
   }
 
   override fun onDetachedFromWindow() {
+    setParentTouchInterceptDisallowed(false)
     lifecycleObserver?.let { lifecycle?.removeObserver(it) }
     lifecycle = null
     super.onDetachedFromWindow()