Set location dialog prefab and proper ViewModel handling

app/src/main/java/com/mirenkov/ktheightmap/MainActivity.kt

@@ -3,18 +3,22 @@ package com.mirenkov.ktheightmap
 import android.app.Application
 import android.content.Intent
 import android.os.Bundle
+import android.util.Log
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
 import androidx.compose.foundation.background
 import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.offset
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.safeDrawingPadding
 import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.text.KeyboardOptions
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Build
+import androidx.compose.material3.AlertDialog
 import androidx.compose.material3.DropdownMenu
 import androidx.compose.material3.DropdownMenuItem
 import androidx.compose.material3.FloatingActionButton
@@ -23,7 +27,10 @@ import androidx.compose.material3.MaterialTheme.colorScheme
 import androidx.compose.material3.Scaffold
 import androidx.compose.material3.Slider
 import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
+import androidx.compose.material3.TextField
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.MutableState
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableFloatStateOf
 import androidx.compose.runtime.mutableStateOf
@@ -35,7 +42,8 @@ import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.rotate
 import androidx.compose.ui.platform.LocalContext
-import androidx.compose.ui.tooling.preview.Preview
+import androidx.compose.ui.text.input.KeyboardType
+import androidx.compose.ui.text.toUpperCase
 import androidx.compose.ui.unit.dp
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.ViewModelProvider
@@ -79,8 +87,6 @@ class MainActivity : ComponentActivity() {
 @Composable
 fun Main(vm: TileViewModel = viewModel()) {
     val sliderValue = rememberSaveable { mutableFloatStateOf(1F) }
-    val canvasOffsetX = rememberSaveable { mutableFloatStateOf(-652.0647F) }
-    val canvasOffsetY = rememberSaveable { mutableFloatStateOf(-1145.693F) }
     val coroutineScope = rememberCoroutineScope()
     val tileContainer = TileContainer(vm, coroutineScope)
     KtHeightMapTheme {
@@ -97,8 +103,6 @@ fun Main(vm: TileViewModel = viewModel()) {
                     backColor = colorScheme.background,
                     scale = sliderValue,
                     tileContainer = tileContainer,
-                    offsetX = canvasOffsetX,
-                    offsetY = canvasOffsetY,
                     modifier = Modifier.padding(innerPadding),
                 )
             }
@@ -122,7 +126,10 @@ fun Main(vm: TileViewModel = viewModel()) {
 @Composable
 fun ToolButton(viewModel: TileViewModel) {
     val context = LocalContext.current
-    var expanded by remember{ mutableStateOf(false) }
+    var expanded by rememberSaveable{ mutableStateOf(false) }
+    var debug by rememberSaveable{ viewModel.debug }
+    var logRequested by remember{ viewModel.logRequested }
+    val dialogShown = rememberSaveable{ mutableStateOf(false) }
     FloatingActionButton(
         onClick = {
             expanded = !expanded
@@ -135,23 +142,79 @@ fun ToolButton(viewModel: TileViewModel) {
         ) {
             DropdownMenuItem(
                 text = { Text("Toggle debug") },
-                onClick = { viewModel.debug = !viewModel.debug }
+                onClick = {
+                    debug = !debug
+                    expanded = false
+                }
             )
             DropdownMenuItem(
                 text = { Text("Log") },
-                onClick = { viewModel.logRequested = true }
+                onClick = {
+                    logRequested = true
+                    expanded = false
+                }
             )
             DropdownMenuItem(
                 text = { Text("Set location") },
-                onClick = {}
+                onClick = {
+                    expanded = false
+                    dialogShown.value = true
+                }
             )
             DropdownMenuItem(
                 text = { Text("Settings") },
                 onClick = {
+                    expanded = false
                     val intent = Intent(context, SettingsActivity::class.java)
                     context.startActivity(intent)
                 }
             )
+            SetLocationDialog(viewModel, dialogShown)
         }
     }
 }
+
+@Composable
+fun SetLocationDialog(vm: TileViewModel, dialogShown: MutableState<Boolean>) {
+    var showLocationDialog by dialogShown
+    if (showLocationDialog) {
+        var latitudeText by remember { vm.latitudeText }
+        var longitudeText by remember { vm.longitudeText }
+        AlertDialog (
+            onDismissRequest = { showLocationDialog = false },
+            title = { Text("Input coordinates") },
+            text = {
+                Column {
+                    TextField(
+                        value = latitudeText,
+                        onValueChange = { newValue ->
+                            latitudeText = newValue
+                        },
+                        label = { Text("Latitude") },
+                        placeholder = { Text("60.086763") },
+                        keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Number)
+                    )
+                    TextField(
+                        value = longitudeText,
+                        onValueChange = { newValue ->
+                            longitudeText = newValue
+                        },
+                        label = { Text("Longitude") },
+                        placeholder = { Text("30.014658") },
+                        keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Number)
+                    )
+                }
+            },
+            confirmButton = { TextButton(onClick = {
+                Log.i(TAG, "Lat: %.6f, Lon: %.6f".format(
+                    latitudeText.text.toDoubleOrNull() ?: 0.0, longitudeText.text.toDoubleOrNull() ?: 0.0
+                ))
+            }) {
+                    Text("Confirm".uppercase())
+                } },
+            dismissButton = { TextButton(onClick = { showLocationDialog = false }) {
+                Text("Cancel".uppercase())
+            } }
+        )
+    }
+}

app/src/main/java/com/mirenkov/ktheightmap/MapCanvas.kt

@@ -34,15 +34,15 @@ fun MapCanvas(
     backColor: Color,
     gridColor: Color,
     scale: MutableFloatState,
-    offsetX: MutableFloatState,
-    offsetY: MutableFloatState,
     tileContainer: TileContainer,
     modifier: Modifier = Modifier
 ) {
-    var offsetX by rememberSaveable { offsetX }
+    var offsetX by rememberSaveable { viewModel.mapOffsetX }
-    var offsetY by rememberSaveable { offsetY }
+    var offsetY by rememberSaveable { viewModel.mapOffsetY }
     val scale by rememberSaveable { scale }
     val textMeasurer = rememberTextMeasurer()
+    val debug by rememberSaveable { viewModel.debug }
+    var logRequested by rememberSaveable { viewModel.logRequested }
     Canvas(
         modifier = modifier.fillMaxSize()
             .pointerInput(Unit) {
@@ -57,9 +57,9 @@ fun MapCanvas(
             size = size
         )
 
-        if (viewModel.logRequested) {
+        if (logRequested) {
             Log.i(TAG, "Offset: %.6f, %.6f".format(offsetX, offsetY))
-            viewModel.logRequested = false
+            logRequested = false
         }
 
         val oldLevel = tileContainer.getLevel()
@@ -101,7 +101,7 @@ fun MapCanvas(
 
         val crossRadius = 24F
 
-        val additionalSize = if (viewModel.debug) 96F else 0F
+        val additionalSize = if (debug) 96F else 0F
         val latLonSize = Size(196F, 96F + additionalSize)
         val latLonOffset = Offset(16F, 16F)
 
@@ -124,7 +124,7 @@ fun MapCanvas(
                     )
                 }
 
-                if (viewModel.debug) {
+                if (debug) {
                     drawRect(
                         color = gridColor,
                         size = Size(TILE_SIZE, TILE_SIZE),
@@ -175,7 +175,7 @@ fun MapCanvas(
                                 val lon = SphereMercator.mercateX(centerTileX, level)
                                 val lat = SphereMercator.mercateY(centerTileY, level)
                                 append("%.6f\n%.6f".format(lon, lat))
-                                if (viewModel.debug) {
+                                if (debug) {
                                     append("\n%.0f\n%.0f".format(offsetX, offsetY))
                                 }
                             }

app/src/main/java/com/mirenkov/ktheightmap/TileViewModel.kt

@@ -1,13 +1,22 @@
 package com.mirenkov.ktheightmap
 
 import android.app.Application
+import androidx.compose.runtime.mutableFloatStateOf
 import androidx.compose.runtime.mutableStateOf
+import androidx.compose.ui.text.input.TextFieldValue
 import androidx.lifecycle.ViewModel
 
 class TileViewModel(application: Application): ViewModel() {
     val repository: TileRepository
-    var debug = false
+
-    var logRequested = false
+    var debug = mutableStateOf(false)
+    var logRequested = mutableStateOf(false)
+
+    var latitudeText = mutableStateOf(TextFieldValue(""))
+    var longitudeText = mutableStateOf(TextFieldValue(""))
+
+    val mapOffsetX = mutableFloatStateOf(-646.65625F)
+    val mapOffsetY = mutableFloatStateOf(-1157.2814F)
 
     init {
         val tileDb = TileDB.getInstance(application)