Viewport (#770)

* Viewport draft

* Simple map example

* format

* more viewport

* declarative viewport draft

* Declarative viewport on iOS and Android

* Fix rebase issues

* Docs, example + bug fix

* add changelog entry

* typo

* Remove unused code

* lint

* lint

* Fix en-/de- coding for CameraViewportState

* Fix exception when converting CameraOptions for CameraViewportState on Android

* Add note about location requirement for FollowPuckViewportState

* Add tests for viewport states

* lint

* Update example/lib/viewport_example.dart

Co-authored-by: Patrick Leonard <[email protected]>

* Center camera over Disneyland in simple map example

* Disable overview state viewport test on Android due to a bug

* Update example/integration_test/viewport_test.dart

Co-authored-by: Patrick Leonard <[email protected]>

---------

Co-authored-by: Patrick Leonard <[email protected]>

Author: evil159

CHANGELOG.md

@@ -1,12 +1,24 @@
-> [!IMPORTANT]
-> Configuring Mapbox's secret token is no longer required when installing our SDKs.
+### main
+
+* Added viewport support to `MapWidget`. Control the camera’s initial position and behavior by specifying a ViewportState subclass in the viewport parameter. This allows for centering on specific locations, following the user’s position, or showing an overview of a geometry. If no viewport is provided, the map uses its default camera settings.
+```dart
+MapWidget(
+  viewport: CameraViewportState(
+    center: Point(coordinates: Position(-117.918976, 33.812092)),
+    zoom: 15.0,
+  ),
+);
+```
 
 ### 2.4.1
 
 * Fix annotation click listeners not working.
 
 ### 2.4.0
 
+> [!IMPORTANT]
+> Configuring Mapbox's secret token is no longer required when installing our SDKs.
+
 * Update Maps SDK to 11.8.0
 * Updated the minimum required Flutter SDK to version 3.22.3 and Dart to version 3.4.4. With the fix for Virtual Display hosting mode on Android in Flutter 3.22, we’ve changed the default map view hosting mode to Virtual Display composition. This update should eliminate the brief visibility of the map after it has been dismissed.
 * Introduce experimental property `MapboxMap.styleGlyphURL`. Use this property to apply custom fonts to the map at runtime, without modifying the base style.

android/src/main/kotlin/com/mapbox/maps/mapbox_maps/MapboxMapController.kt

@@ -26,6 +26,9 @@ import com.mapbox.maps.mapbox_maps.pigeons._AnimationManager
 import com.mapbox.maps.mapbox_maps.pigeons._CameraManager
 import com.mapbox.maps.mapbox_maps.pigeons._LocationComponentSettingsInterface
 import com.mapbox.maps.mapbox_maps.pigeons._MapInterface
+import com.mapbox.maps.mapbox_maps.pigeons._ViewportMessenger
+import com.mapbox.maps.plugin.animation.camera
+import com.mapbox.maps.plugin.viewport.viewport
 import io.flutter.embedding.android.FlutterActivity
 import io.flutter.plugin.common.BinaryMessenger
 import io.flutter.plugin.common.MethodCall
@@ -64,6 +67,7 @@ class MapboxMapController(
   private val attributionController: AttributionController
   private val scaleBarController: ScaleBarController
   private val compassController: CompassController
+  private val viewportController: ViewportController
 
   private val eventHandler: MapboxEventHandler
 
@@ -145,6 +149,7 @@ class MapboxMapController(
     attributionController = AttributionController(mapView)
     scaleBarController = ScaleBarController(mapView)
     compassController = CompassController(mapView)
+    viewportController = ViewportController(mapView.viewport, mapView.camera, context, mapboxMap)
 
     changeUserAgent(pluginVersion)
 
@@ -160,6 +165,7 @@ class MapboxMapController(
     AttributionSettingsInterface.setUp(messenger, attributionController, this.channelSuffix)
     ScaleBarSettingsInterface.setUp(messenger, scaleBarController, this.channelSuffix)
     CompassSettingsInterface.setUp(messenger, compassController, this.channelSuffix)
+    _ViewportMessenger.setUp(messenger, viewportController, this.channelSuffix)
 
     methodChannel = MethodChannel(messenger, "plugins.flutter.io.$channelSuffix")
     methodChannel.setMethodCallHandler(this)
@@ -197,6 +203,7 @@ class MapboxMapController(
     mapView = null
     mapboxMap = null
     methodChannel.setMethodCallHandler(null)
+
     StyleManager.setUp(messenger, null, channelSuffix)
     _CameraManager.setUp(messenger, null, channelSuffix)
     Projection.setUp(messenger, null, channelSuffix)
@@ -209,6 +216,7 @@ class MapboxMapController(
     CompassSettingsInterface.setUp(messenger, null, channelSuffix)
     ScaleBarSettingsInterface.setUp(messenger, null, channelSuffix)
     AttributionSettingsInterface.setUp(messenger, null, channelSuffix)
+    _ViewportMessenger.setUp(messenger, null, channelSuffix)
   }
 
   override fun onMethodCall(call: MethodCall, result: MethodChannel.Result) {
@@ -246,6 +254,9 @@ class MapboxMapController(
           result.success(byteArray)
         }
       }
+      "mapView#submitViewSizeHint" -> {
+        result.success(null) // no-op on this platform
+      }
       else -> {
         result.notImplemented()
       }

android/src/main/kotlin/com/mapbox/maps/mapbox_maps/MapboxMapFactory.kt

@@ -29,7 +29,7 @@ class MapboxMapFactory(
     val cameraOptions = params["cameraOptions"] as com.mapbox.maps.mapbox_maps.pigeons.CameraOptions?
     val channelSuffix = params["channelSuffix"] as Long
     val textureView = params["textureView"] as? Boolean ?: false
-    val styleUri = params["styleUri"] as? String ?: Style.MAPBOX_STREETS
+    val styleUri = params["styleUri"] as? String ?: Style.STANDARD
     val pluginVersion = params["mapboxPluginVersion"] as String
     val eventTypes = params["eventTypes"] as List<Long>
 

android/src/main/kotlin/com/mapbox/maps/mapbox_maps/ViewportController.kt

@@ -0,0 +1,262 @@
+package com.mapbox.maps.mapbox_maps
+
+import android.animation.Animator
+import android.animation.AnimatorListenerAdapter
+import android.content.Context
+import android.view.animation.PathInterpolator
+import com.google.gson.GsonBuilder
+import com.mapbox.common.Cancelable
+import com.mapbox.geojson.Polygon
+import com.mapbox.geojson.gson.GeoJsonAdapterFactory
+import com.mapbox.maps.CameraOptions
+import com.mapbox.maps.MapboxMap
+import com.mapbox.maps.ScreenCoordinate
+import com.mapbox.maps.logE
+import com.mapbox.maps.mapbox_maps.pigeons._DefaultViewportTransitionOptions
+import com.mapbox.maps.mapbox_maps.pigeons._EasingViewportTransitionOptions
+import com.mapbox.maps.mapbox_maps.pigeons._FlyViewportTransitionOptions
+import com.mapbox.maps.mapbox_maps.pigeons._FollowPuckViewportStateBearing
+import com.mapbox.maps.mapbox_maps.pigeons._FollowPuckViewportStateOptions
+import com.mapbox.maps.mapbox_maps.pigeons._OverviewViewportStateOptions
+import com.mapbox.maps.mapbox_maps.pigeons._ViewportMessenger
+import com.mapbox.maps.mapbox_maps.pigeons._ViewportStateStorage
+import com.mapbox.maps.mapbox_maps.pigeons._ViewportStateType
+import com.mapbox.maps.mapbox_maps.pigeons._ViewportTransitionStorage
+import com.mapbox.maps.mapbox_maps.pigeons._ViewportTransitionType
+import com.mapbox.maps.plugin.animation.CameraAnimationsPlugin
+import com.mapbox.maps.plugin.animation.MapAnimationOptions
+import com.mapbox.maps.plugin.viewport.CompletionListener
+import com.mapbox.maps.plugin.viewport.ViewportPlugin
+import com.mapbox.maps.plugin.viewport.data.DefaultViewportTransitionOptions
+import com.mapbox.maps.plugin.viewport.data.FollowPuckViewportStateBearing
+import com.mapbox.maps.plugin.viewport.data.FollowPuckViewportStateOptions
+import com.mapbox.maps.plugin.viewport.data.OverviewViewportStateOptions
+import com.mapbox.maps.plugin.viewport.state.ViewportState
+import com.mapbox.maps.plugin.viewport.state.ViewportStateDataObserver
+import com.mapbox.maps.plugin.viewport.transition.ViewportTransition
+
+class ViewportController(
+  private val viewportPlugin: ViewportPlugin,
+  private val cameraPlugin: CameraAnimationsPlugin,
+  private val context: Context,
+  private val mapboxMap: MapboxMap
+) : _ViewportMessenger {
+
+  override fun transition(
+    stateStorage: _ViewportStateStorage,
+    transitionStorage: _ViewportTransitionStorage?,
+    callback: (Result<Boolean>) -> Unit
+  ) {
+    try {
+      val state = viewportPlugin.viewportStateFromFLTState(stateStorage, context, mapboxMap)
+      if (state == null) {
+        callback(Result.success(true))
+        return
+      }
+      val transition = viewportPlugin.transitionFromFLTTransition(transitionStorage, cameraPlugin)
+      viewportPlugin.transitionTo(state, transition) { success ->
+        callback(Result.success(success))
+      }
+    } catch (error: Exception) {
+      logE("Viewport", "Could not create viewport state ouf of options: $stateStorage")
+      callback(Result.success(false))
+    }
+  }
+}
+
+fun ViewportPlugin.transitionFromFLTTransition(
+  transitionStorage: _ViewportTransitionStorage?,
+  cameraPlugin: CameraAnimationsPlugin
+): ViewportTransition {
+  return when (transitionStorage?.type) {
+    _ViewportTransitionType.DEFAULT_TRANSITION ->
+      (transitionStorage.options as? _DefaultViewportTransitionOptions)
+        ?.let { makeDefaultViewportTransition(it.toOptions()) }
+
+    _ViewportTransitionType.FLY ->
+      (transitionStorage.options as? _FlyViewportTransitionOptions)
+        ?.let {
+          GenericViewportTransition { cameraOptions, completion ->
+            val options = MapAnimationOptions.Builder()
+            if (it.durationMs != null) {
+              options.duration(it.durationMs)
+            }
+            cameraPlugin.flyTo(
+              cameraOptions, options.build(),
+              object : AnimatorListenerAdapter() {
+                override fun onAnimationEnd(animation: Animator) {
+                  completion.onComplete(true)
+                }
+
+                override fun onAnimationCancel(animation: Animator) {
+                  completion.onComplete(false)
+                }
+              }
+            )
+          }
+        }
+
+    _ViewportTransitionType.EASING ->
+      (transitionStorage.options as? _EasingViewportTransitionOptions)
+        ?.let {
+          GenericViewportTransition { cameraOptions, completion ->
+            val options = MapAnimationOptions.Builder()
+              .duration(it.durationMs)
+              .interpolator(
+                PathInterpolator(
+                  it.a.toFloat(),
+                  it.b.toFloat(),
+                  it.c.toFloat(),
+                  it.d.toFloat()
+                )
+              )
+              .build()
+            cameraPlugin.easeTo(
+              cameraOptions, options,
+              object : AnimatorListenerAdapter() {
+                override fun onAnimationEnd(animation: Animator) {
+                  completion.onComplete(true)
+                }
+
+                override fun onAnimationCancel(animation: Animator) {
+                  completion.onComplete(false)
+                }
+              }
+            )
+          }
+        }
+
+    null -> null
+  } ?: makeImmediateViewportTransition()
+}
+
+typealias AnimationRunner = (CameraOptions, CompletionListener) -> Unit
+
+class GenericViewportTransition(private val runAnimation: AnimationRunner) : ViewportTransition {
+
+  override fun run(to: ViewportState, completionListener: CompletionListener): Cancelable {
+    return to.observeDataSource { cameraOptions ->
+      runAnimation(cameraOptions) { animationPosition ->
+        completionListener.onComplete(animationPosition)
+      }
+      return@observeDataSource false
+    }
+  }
+}
+
+fun _DefaultViewportTransitionOptions.toOptions(): DefaultViewportTransitionOptions {
+  return DefaultViewportTransitionOptions.Builder()
+    .maxDurationMs(maxDurationMs)
+    .build()
+}
+
+fun ViewportPlugin.viewportStateFromFLTState(
+  stateStorage: _ViewportStateStorage,
+  context: Context,
+  mapboxMap: MapboxMap
+): ViewportState? {
+  return when (stateStorage.type) {
+    _ViewportStateType.IDLE -> idle().let { null }
+    _ViewportStateType.FOLLOW_PUCK ->
+      makeFollowPuckViewportState((stateStorage.options as _FollowPuckViewportStateOptions).toOptions())
+
+    _ViewportStateType.OVERVIEW ->
+      makeOverviewViewportState(
+        (stateStorage.options as _OverviewViewportStateOptions).toOptions(
+          context
+        )
+      )
+
+    _ViewportStateType.STYLE_DEFAULT -> StyleDefaultViewportState(mapboxMap)
+    _ViewportStateType.CAMERA -> CameraViewportState(
+      (stateStorage.options as com.mapbox.maps.mapbox_maps.pigeons.CameraOptions).toCameraOptions(
+        context
+      ),
+      mapboxMap
+    )
+  }
+}
+
+fun _FollowPuckViewportStateOptions.toOptions(): FollowPuckViewportStateOptions {
+  val bearing: FollowPuckViewportStateBearing? = when (this.bearing) {
+    _FollowPuckViewportStateBearing.HEADING -> FollowPuckViewportStateBearing.SyncWithLocationPuck
+    _FollowPuckViewportStateBearing.COURSE -> FollowPuckViewportStateBearing.SyncWithLocationPuck
+    _FollowPuckViewportStateBearing.CONSTANT -> {
+      if (bearingValue == null) {
+        logE(
+          "Viewport",
+          "Invalid FollowPuckViewportStateOptions, bearing mode is CONSTANT but bearingValue is null"
+        )
+      }
+
+      bearingValue?.let { FollowPuckViewportStateBearing.Constant(it) }
+    }
+
+    null -> null
+  }
+
+  return FollowPuckViewportStateOptions.Builder()
+    .zoom(zoom)
+    .bearing(bearing)
+    .pitch(pitch)
+    .build()
+}
+
+fun _OverviewViewportStateOptions.toOptions(context: Context): OverviewViewportStateOptions {
+  val geometry = GsonBuilder()
+    .registerTypeAdapterFactory(GeoJsonAdapterFactory.create())
+    .create()
+    .fromJson(geometry, Polygon::class.java)
+  return OverviewViewportStateOptions.Builder()
+    .geometry(geometry)
+    .padding(padding?.toEdgeInsets(context))
+    .geometryPadding(geometryPadding.toEdgeInsets(context))
+    .bearing(bearing)
+    .pitch(pitch)
+    .maxZoom(maxZoom)
+    .offset(offset?.toScreenCoordinate(context) ?: ScreenCoordinate(0.0, 0.0))
+    .animationDurationMs(animationDurationMs)
+    .build()
+}
+
+class CameraViewportState(private val options: CameraOptions, private val mapboxMap: MapboxMap) :
+  ViewportState {
+
+  override fun observeDataSource(viewportStateDataObserver: ViewportStateDataObserver): Cancelable {
+    viewportStateDataObserver.onNewData(options)
+    return Cancelable { }
+  }
+
+  override fun startUpdatingCamera() {
+    mapboxMap.setCamera(options)
+  }
+
+  override fun stopUpdatingCamera() {}
+}
+
+class StyleDefaultViewportState(private val mapboxMap: MapboxMap) : ViewportState {
+  private var token: Cancelable? = null
+
+  private fun observeStyleDefaultCamera(handler: (CameraOptions) -> Unit): Cancelable {
+    if (mapboxMap.isStyleLoaded()) {
+      handler(mapboxMap.styleManager.styleDefaultCamera)
+      return Cancelable { }
+    }
+
+    return mapboxMap.subscribeStyleLoaded {
+      handler(mapboxMap.styleManager.styleDefaultCamera)
+    }
+  }
+
+  override fun observeDataSource(viewportStateDataObserver: ViewportStateDataObserver): Cancelable {
+    return observeStyleDefaultCamera { viewportStateDataObserver.onNewData(it) }
+  }
+
+  override fun startUpdatingCamera() {
+    token = observeStyleDefaultCamera { mapboxMap.setCamera(it) }
+  }
+
+  override fun stopUpdatingCamera() {
+    token?.cancel()
+  }
+}