feat: location button, and abstracting extInsets to common code

composeApp/build.gradle.kts

@@ -35,6 +35,7 @@ kotlin {
             implementation(compose.preview)
             implementation(libs.androidx.activity.compose)
             implementation(libs.kotlinx.coroutines.android)
+            implementation(libs.play.services.location)
             implementation(libs.play.services.maps)
             implementation(libs.maps.compose)
         }
@@ -49,6 +50,8 @@ kotlin {
             implementation(libs.androidx.lifecycle.viewmodel)
             implementation(libs.androidx.lifecycle.runtime.compose)
             implementation(libs.kotlinx.coroutines.core)
+            implementation(libs.moko.geo)
+            implementation(libs.moko.geo.compose)
             implementation(projects.shared)
 
         }
@@ -89,3 +92,8 @@ dependencies {
 secrets {
     propertiesFileName = "secrets.properties"
 }
+
+compose.resources {
+    publicResClass = true
+    packageOfResClass = "moe.lava.banksia.resources"
+}

composeApp/src/androidMain/AndroidManifest.xml

@@ -2,6 +2,8 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
 
     <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
+    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
     <application
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"

composeApp/src/androidMain/kotlin/moe/lava/banksia/native/maps/Maps.android.kt

@@ -1,68 +1,73 @@
 package moe.lava.banksia.native.maps
 
-import android.app.ActivityManager
-import android.content.Context
-import android.os.Build
-import android.util.DisplayMetrics
-import android.view.View
-import android.view.WindowManager
+import android.Manifest
+import android.content.pm.PackageManager
 import androidx.compose.foundation.layout.WindowInsets
 import androidx.compose.foundation.layout.add
 import androidx.compose.foundation.layout.asPaddingValues
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.safeDrawing
 import androidx.compose.material3.ExperimentalMaterial3Api
-import androidx.compose.material3.SheetState
-import androidx.compose.material3.SheetValue
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.remember
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalConfiguration
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.platform.LocalDensity
+import androidx.compose.ui.unit.dp
+import androidx.core.content.ContextCompat
+import com.google.android.gms.location.LocationServices
 import com.google.android.gms.maps.model.CameraPosition
 import com.google.android.gms.maps.model.LatLng
+import com.google.android.gms.maps.model.MapStyleOptions
 import com.google.maps.android.compose.ComposeMapColorScheme
 import com.google.maps.android.compose.DefaultMapProperties
 import com.google.maps.android.compose.DefaultMapUiSettings
 import com.google.maps.android.compose.GoogleMap
-import com.google.maps.android.compose.Marker
 import com.google.maps.android.compose.Polyline
 import com.google.maps.android.compose.rememberCameraPositionState
-import kotlin.math.roundToInt
+import moe.lava.banksia.R
 
 
 fun Point.toLatLng(): LatLng = LatLng(this.lat, this.lng)
 
+@Composable
+private fun checkLocationPermission() =
+    ContextCompat.checkSelfPermission(LocalContext.current, Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED
+
+@Composable
+actual fun getScreenHeight(): Int {
+    val dp = LocalConfiguration.current.screenHeightDp.dp
+    return with(LocalDensity.current) {
+        dp.roundToPx()
+    }
+}
+
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
 actual fun Maps(
     modifier: Modifier,
     markers: List<Marker>,
     polylines: List<Polyline>,
-    cameraPosition: Point,
-    sheetState: SheetState,
+    newCameraPosition: Point?,
+    cameraPositionUpdated: () -> Unit,
+    extInsets: Int,
 ) {
-    val extInsets = if (
-        sheetState.currentValue != SheetValue.Hidden ||
-        sheetState.targetValue != SheetValue.Hidden
-    ) {
-        val context = LocalContext.current
-        val windowManager = remember { context.getSystemService(Context.WINDOW_SERVICE) as WindowManager }
-        val screenHeight = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R)
-            windowManager.currentWindowMetrics.bounds.height()
-        else {
-            var outMetrics = DisplayMetrics()
-            @Suppress("DEPRECATION")
-            windowManager.defaultDisplay.getMetrics(outMetrics)
-            outMetrics.heightPixels
-        }
-        val scaffoldOffset = sheetState.requireOffset().roundToInt()
-        (screenHeight - scaffoldOffset - WindowInsets.safeDrawing.getBottom(LocalDensity.current)).coerceAtLeast(0)
-    } else 0
     var camPos = rememberCameraPositionState()
-    LaunchedEffect(cameraPosition) {
-        camPos.position = CameraPosition(cameraPosition.toLatLng(), 16.0f, 0.0f, 0.0f)
+    val ctx = LocalContext.current
+    val fusedLocation = remember { LocationServices.getFusedLocationProviderClient(ctx) }
+    LaunchedEffect(Unit) {
+        fusedLocation.lastLocation.addOnSuccessListener {
+            if (it != null)
+                camPos.position = CameraPosition(LatLng(it.latitude, it.longitude), 16.0f, 0.0f, 0.0f)
+        }
+    }
+    LaunchedEffect(newCameraPosition) {
+        if (newCameraPosition != null) {
+            camPos.position = CameraPosition(newCameraPosition.toLatLng(), 16.0f, 0.0f, 0.0f)
+            cameraPositionUpdated()
+        }
     }
 
     GoogleMap(
@@ -70,8 +75,8 @@ actual fun Maps(
         cameraPositionState = camPos,
         mapColorScheme = ComposeMapColorScheme.FOLLOW_SYSTEM,
         properties = DefaultMapProperties.copy(
-            //mapStyleOptions = MapStyleOptions.loadRawResourceStyle(LocalContext.current, R.raw.def_mapstyle),
-            //isMyLocationEnabled = checkLocationPermission(),
+            mapStyleOptions = MapStyleOptions.loadRawResourceStyle(LocalContext.current, R.raw.def_mapstyle),
+            isMyLocationEnabled = checkLocationPermission(),
         ),
         uiSettings = DefaultMapUiSettings.copy(
             zoomControlsEnabled = false,

composeApp/src/androidMain/res/raw/def_mapstyle.json

@@ -0,0 +1,37 @@
+[
+  {
+    "featureType": "poi.business",
+    "stylers": [
+      {
+        "visibility": "off"
+      }
+    ]
+  },
+  {
+    "featureType": "poi.park",
+    "elementType": "labels.text",
+    "stylers": [
+      {
+        "visibility": "off"
+      }
+    ]
+  },
+  {
+    "featureType": "road.highway",
+    "elementType": "labels.icon",
+    "stylers": [
+      {
+        "visibility": "off"
+      }
+    ]
+  },
+  {
+    "featureType": "transit",
+    "elementType": "labels.icon",
+    "stylers": [
+      {
+        "visibility": "off"
+      }
+    ]
+  }
+]

composeApp/src/commonMain/composeResources/drawable/my_location_24.xml

@@ -0,0 +1,5 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android" android:height="24dp" android:tint="#000000" android:viewportHeight="24" android:viewportWidth="24" android:width="24dp">
+      
+    <path android:fillColor="#FFFFFFFF" android:pathData="M12,8c-2.21,0 -4,1.79 -4,4s1.79,4 4,4 4,-1.79 4,-4 -1.79,-4 -4,-4zM20.94,11c-0.46,-4.17 -3.77,-7.48 -7.94,-7.94L13,1h-2v2.06C6.83,3.52 3.52,6.83 3.06,11L1,11v2h2.06c0.46,4.17 3.77,7.48 7.94,7.94L11,23h2v-2.06c4.17,-0.46 7.48,-3.77 7.94,-7.94L23,13v-2h-2.06zM12,19c-3.87,0 -7,-3.13 -7,-7s3.13,-7 7,-7 7,3.13 7,7 -3.13,7 -7,7z"/>
+    
+</vector>

composeApp/src/commonMain/kotlin/moe/lava/banksia/App.kt

@@ -1,9 +1,18 @@
 package moe.lava.banksia
 
 import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.WindowInsets
+import androidx.compose.foundation.layout.add
 import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.safeContent
+import androidx.compose.foundation.layout.safeDrawing
+import androidx.compose.foundation.layout.windowInsetsPadding
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.LocationOn
 import androidx.compose.material3.BottomSheetScaffold
 import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.FloatingActionButton
+import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.SheetValue
 import androidx.compose.material3.rememberBottomSheetScaffoldState
@@ -12,12 +21,26 @@ import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalDensity
+import dev.icerock.moko.geo.compose.BindLocationTrackerEffect
+import dev.icerock.moko.geo.compose.LocationTrackerAccuracy
+import dev.icerock.moko.geo.compose.rememberLocationTrackerFactory
+import kotlinx.coroutines.flow.distinctUntilChanged
+import kotlinx.coroutines.launch
 import moe.lava.banksia.api.ptv.PtvService
 import moe.lava.banksia.native.maps.Maps
+import moe.lava.banksia.native.maps.Point
+import moe.lava.banksia.native.maps.getScreenHeight
+import moe.lava.banksia.resources.Res
+import moe.lava.banksia.resources.my_location_24
 import moe.lava.banksia.ui.Searcher
+import org.jetbrains.compose.resources.painterResource
 import org.jetbrains.compose.ui.tooling.preview.Preview
+import kotlin.math.roundToInt
 
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
@@ -30,17 +53,43 @@ fun App() {
         )
     )
 
+    val locationFactory = rememberLocationTrackerFactory(LocationTrackerAccuracy.Best)
+    val locationTracker = remember { locationFactory.createLocationTracker() }
+    BindLocationTrackerEffect(locationTracker)
+    var lastLocation by remember { mutableStateOf(Point(-37.8136, 144.9631)) }
+    var newCameraPosition by remember { mutableStateOf<Point?>(Point(-37.8136, 144.9631)) }
     var searchTextState by remember { mutableStateOf("") }
     var searchExpandedState by remember { mutableStateOf(false) }
 
+    val sheetState = scaffoldState.bottomSheetState
+    val extInsets = if (
+        sheetState.currentValue != SheetValue.Hidden ||
+        sheetState.targetValue != SheetValue.Hidden
+    ) {
+        val scaffoldOffset = sheetState.requireOffset().roundToInt()
+        (getScreenHeight() - scaffoldOffset - WindowInsets.safeDrawing.getBottom(LocalDensity.current)).coerceAtLeast(0)
+    } else 0
+
+    var scope = rememberCoroutineScope()
+    scope.launch {
+        val flow = locationTracker.getLocationsFlow()
+        locationTracker.startTracking()
+        flow.distinctUntilChanged().collect {
+            lastLocation = Point(it.latitude, it.longitude)
+        }
+    }
+
     MaterialTheme {
         BottomSheetScaffold(
             scaffoldState = scaffoldState,
+            modifier = Modifier.fillMaxSize(),
             sheetContent = { Box(modifier = Modifier) },
         ) {
             Maps(
                 modifier = Modifier.fillMaxSize(),
-                sheetState = scaffoldState.bottomSheetState,
+                newCameraPosition = newCameraPosition,
+                cameraPositionUpdated = { newCameraPosition = null },
+                extInsets = extInsets,
             )
             Searcher(
                 ptvService = PtvService(),
@@ -50,6 +99,20 @@ fun App() {
                 onTextChange = { searchTextState = it },
                 onRouteChange = {}
             )
+
+            Box(
+                Modifier.windowInsetsPadding(WindowInsets.safeContent.add(WindowInsets(bottom = extInsets))),
+                contentAlignment = Alignment.BottomEnd
+            ) {
+                FloatingActionButton(
+                    containerColor = MaterialTheme.colorScheme.surfaceContainer,
+                    onClick = {
+                        newCameraPosition = lastLocation
+                    },
+                ) {
+                    Icon(painterResource(Res.drawable.my_location_24), "Move to current location")
+                }
+            }
         }
     }
 }

composeApp/src/commonMain/kotlin/moe/lava/banksia/native/maps/Maps.kt

@@ -5,17 +5,22 @@ import androidx.compose.material3.SheetState
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.unit.Dp
 
 data class Marker(val name: String, val onClick: () -> Boolean)
 data class Point(val lat: Double, val lng: Double)
 data class Polyline(val points: List<Point>, val colour: Color)
 
+@Composable
+expect fun getScreenHeight(): Int
+
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
 expect fun Maps(
     modifier: Modifier = Modifier,
     markers: List<Marker> = listOf(),
     polylines: List<Polyline> = listOf(),
-    cameraPosition: Point = Point(-37.8136, 144.9631),
-    sheetState: SheetState,
+    newCameraPosition: Point? = Point(-37.8136, 144.9631),
+    cameraPositionUpdated: () -> Unit,
+    extInsets: Int,
 )

composeApp/src/iosMain/kotlin/moe/lava/banksia/native/maps/Maps.ios.kt

@@ -3,7 +3,16 @@ package moe.lava.banksia.native.maps
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.SheetState
 import androidx.compose.runtime.Composable
+import androidx.compose.ui.ExperimentalComposeUiApi
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalWindowInfo
+import androidx.compose.ui.unit.Dp
+
+@OptIn(ExperimentalComposeUiApi::class)
+@Composable
+actual fun getScreenHeight(): Int {
+    return LocalWindowInfo.current.containerSize.height
+}
 
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
@@ -11,8 +20,9 @@ actual fun Maps(
     modifier: Modifier,
     markers: List<Marker>,
     polylines: List<Polyline>,
-    cameraPosition: Point,
-    sheetState: SheetState,
+    newCameraPosition: Point?,
+    cameraPositionUpdated: () -> Unit,
+    extInsets: Int,
 ) {
     TODO("Not yet implemented")
 }

gradle/libs.versions.toml

@@ -13,6 +13,7 @@ androidx-material = "1.12.0"
 androidx-test-junit = "1.2.1"
 compose-multiplatform = "1.7.3"
 coroutines = "1.9.0"
+geo = "0.8.0"
 junit = "4.13.2"
 kotlin = "2.1.10"
 kotlinxSerializationJson = "1.8.1"
@@ -20,10 +21,13 @@ ktor = "3.1.1"
 logback = "1.5.17"
 mapsCompose = "6.4.1"
 okio = "3.11.0"
+playServicesLocation = "21.3.0"
 playServicesMaps = "19.1.0"
 secretsGradlePlugin = "2.0.1"
 
 [libraries]
+moko-geo = { module = "dev.icerock.moko:geo", version.ref = "geo" }
+moko-geo-compose = { module = "dev.icerock.moko:geo-compose", version.ref = "geo" }
 kotlin-test = { module = "org.jetbrains.kotlin:kotlin-test", version.ref = "kotlin" }
 kotlin-test-junit = { module = "org.jetbrains.kotlin:kotlin-test-junit", version.ref = "kotlin" }
 junit = { group = "junit", name = "junit", version.ref = "junit" }
@@ -50,6 +54,7 @@ ktor-server-tests = { module = "io.ktor:ktor-server-test-host", version.ref = "k
 logback = { module = "ch.qos.logback:logback-classic", version.ref = "logback" }
 maps-compose = { module = "com.google.maps.android:maps-compose", version.ref = "mapsCompose" }
 okio = { module = "com.squareup.okio:okio", version.ref = "okio" }
+play-services-location = { module = "com.google.android.gms:play-services-location", version.ref = "playServicesLocation" }
 play-services-maps = { module = "com.google.android.gms:play-services-maps", version.ref = "playServicesMaps" }
 secrets-gradle-plugin = { module = "com.google.android.libraries.mapsplatform.secrets-gradle-plugin:secrets-gradle-plugin", version.ref = "secretsGradlePlugin" }