Image Viewer Camera (#2864)

experimental/examples/imageviewer/gradle.properties

@@ -13,5 +13,5 @@ kotlin.native.useEmbeddableCompilerJar=true
 kotlin.native.binary.memoryModel=experimental
 kotlin.version=1.8.0
 agp.version=7.1.3
-compose.version=1.4.0-alpha01-dev972
+compose.version=1.4.0-alpha01-dev975
 ktor.version=2.2.1

experimental/examples/imageviewer/iosApp/iosApp/Info.plist

@@ -2,6 +2,8 @@
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
 <dict>
+	<key>NSLocationWhenInUseUsageDescription</key>
+	<string>This app uses location data to show taken photos on a map</string>
 	<key>CFBundleDevelopmentRegion</key>
 	<string>$(DEVELOPMENT_LANGUAGE)</string>
 	<key>CFBundleExecutable</key>
@@ -20,6 +22,8 @@
 	<string>1</string>
 	<key>LSRequiresIPhoneOS</key>
 	<true/>
+	<key>NSCameraUsageDescription</key>
+	<string>This app uses camera for capturing photos</string>
 	<key>UIApplicationSceneManifest</key>
 	<dict>
 		<key>UIApplicationSupportsMultipleScenes</key>

experimental/examples/imageviewer/settings.gradle.kts

@@ -3,6 +3,7 @@ pluginManagement {
         gradlePluginPortal()
         maven("https://maven.pkg.jetbrains.space/public/p/compose/dev")
         google()
+        mavenLocal()
     }
 
     plugins {

experimental/examples/imageviewer/shared/src/androidMain/kotlin/example/imageviewer/view/CameraView.android.kt

@@ -0,0 +1,21 @@
+package example.imageviewer.view
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+
+@Composable
+internal actual fun CameraView(modifier: Modifier) {
+    Box(Modifier.fillMaxSize().background(Color.Black)) {
+        Text(
+            text = "Camera is not available on Android for now.",
+            color = Color.White,
+            modifier = Modifier.align(Alignment.Center)
+        )
+    }
+}

experimental/examples/imageviewer/shared/src/commonMain/kotlin/example/imageviewer/ImageViewer.common.kt

@@ -102,9 +102,10 @@ internal fun ImageViewerCommon(
                 }
 
                 is CameraPage -> {
-                    CameraScreen(onBack = {
-                        navigationStack.back()
-                    })
+                    CameraScreen(
+                        localization = dependencies.localization,
+                        onBack = { navigationStack.back() }
+                    )
                 }
             }
         }

experimental/examples/imageviewer/shared/src/commonMain/kotlin/example/imageviewer/view/CameraScreen.kt

@@ -1,19 +1,27 @@
 package example.imageviewer.view
 
-import androidx.compose.foundation.background
-import androidx.compose.foundation.clickable
-import androidx.compose.foundation.layout.Box
-import androidx.compose.foundation.layout.fillMaxSize
-import androidx.compose.material3.Text
+import androidx.compose.foundation.layout.*
 import androidx.compose.runtime.Composable
-import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
-import androidx.compose.ui.graphics.Color
-import androidx.compose.ui.text.style.TextAlign
+import example.imageviewer.Localization
+import org.jetbrains.compose.resources.ExperimentalResourceApi
+import org.jetbrains.compose.resources.painterResource
 
+@OptIn(ExperimentalResourceApi::class)
 @Composable
-internal fun CameraScreen(onBack: () -> Unit) {
-    Box(Modifier.fillMaxSize().background(Color.Black).clickable { onBack() }, contentAlignment = Alignment.Center) {
-        Text("Nothing here yet 📸", textAlign = TextAlign.Center, color = Color.White)
+internal fun CameraScreen(localization: Localization, onBack: () -> Unit) {
+    Box(Modifier.fillMaxSize()) {
+        CameraView(Modifier.fillMaxSize())
+        TopLayout(
+            alignLeftContent = {
+                Tooltip(localization.back) {
+                    CircularButton(
+                        painterResource("arrowleft.png"),
+                        onClick = { onBack() }
+                    )
+                }
+            },
+            alignRightContent = {},
+        )
     }
-}
+}

experimental/examples/imageviewer/shared/src/commonMain/kotlin/example/imageviewer/view/CameraView.common.kt

@@ -0,0 +1,7 @@
+package example.imageviewer.view
+
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+
+@Composable
+internal expect fun CameraView(modifier: Modifier)

experimental/examples/imageviewer/shared/src/commonMain/kotlin/example/imageviewer/view/CircularButton.kt

@@ -15,9 +15,13 @@ import androidx.compose.ui.unit.dp
 import example.imageviewer.style.ImageviewerColors
 
 @Composable
-internal fun CircularButton(image: Painter, onClick: () -> Unit) {
+internal fun CircularButton(
+    image: Painter,
+    modifier: Modifier = Modifier,
+    onClick: () -> Unit,
+) {
     Box(
-        Modifier.size(40.dp).clip(CircleShape).background(ImageviewerColors.uiLightBlack)
+        modifier.size(50.dp).clip(CircleShape).background(ImageviewerColors.uiLightBlack)
             .clickable { onClick() }, contentAlignment = Alignment.Center
     ) {
         Image(

experimental/examples/imageviewer/shared/src/commonMain/kotlin/example/imageviewer/view/GalleryScreen.kt

@@ -11,10 +11,7 @@ import androidx.compose.foundation.lazy.grid.LazyVerticalGrid
 import androidx.compose.foundation.lazy.grid.itemsIndexed
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.material3.MaterialTheme
-import androidx.compose.runtime.Composable
-import androidx.compose.runtime.LaunchedEffect
-import androidx.compose.runtime.collectAsState
-import androidx.compose.runtime.getValue
+import androidx.compose.runtime.*
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
@@ -89,7 +86,11 @@ internal fun GalleryScreen(
                     onFullScreen = { onClickPreviewPicture(it) }
                 )
             }
-            MakeNewMemoryMiniature(onMakeNewMemory)
+            CircularButton(
+                image = painterResource("plus.png"),
+                modifier = Modifier.align(Alignment.BottomCenter).padding(48.dp),
+                onClick = onMakeNewMemory,
+            )
         }
     }
     if (pictures.isEmpty()) {
@@ -123,33 +124,6 @@ private fun SquaresGalleryView(
     }
 }
 
-@OptIn(ExperimentalResourceApi::class)
-@Composable
-private fun BoxScope.MakeNewMemoryMiniature(onClick: () -> Unit) {
-    Column(modifier = Modifier.align(Alignment.BottomCenter)) {
-        Box(
-            Modifier
-                .clip(CircleShape)
-                .width(52.dp)
-                .background(ImageviewerColors.uiLightBlack)
-                .aspectRatio(1.0f)
-                .clickable {
-                    onClick()
-                },
-            contentAlignment = Alignment.Center
-        ) {
-            Image(
-                painter = painterResource("plus.png"),
-                contentDescription = null,
-                modifier = Modifier
-                    .width(18.dp)
-                    .height(18.dp),
-            )
-        }
-        Spacer(Modifier.height(32.dp))
-    }
-}
-
 @OptIn(ExperimentalResourceApi::class)
 @Composable
 internal fun SquareMiniature(image: ImageBitmap, isHighlighted: Boolean, onClick: () -> Unit) {

experimental/examples/imageviewer/shared/src/commonMain/kotlin/example/imageviewer/view/MemoryScreen.kt

@@ -155,7 +155,7 @@ internal fun BoxScope.MagicButtonOverlay(onClick: () -> Unit) {
     Column(
         modifier = Modifier.align(Alignment.BottomEnd).padding(end = 12.dp, bottom = 16.dp)
     ) {
-        CircularButton(painterResource("magic.png"), onClick)
+        CircularButton(painterResource("magic.png"), onClick = onClick)
     }
 }
 

experimental/examples/imageviewer/shared/src/commonMain/kotlin/example/imageviewer/view/TopLayout.kt

@@ -19,7 +19,7 @@ internal fun TopLayout(
         Modifier
             .fillMaxWidth()
             .notchPadding()
-            .padding(horizontal = 12.dp)
+            .padding(12.dp)
     ) {
         Row(Modifier.align(Alignment.CenterStart)) {
             alignLeftContent()

experimental/examples/imageviewer/shared/src/desktopMain/kotlin/example/imageviewer/view/CameraView.desktop.kt

@@ -0,0 +1,21 @@
+package example.imageviewer.view
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+
+@Composable
+internal actual fun CameraView(modifier: Modifier) {
+    Box(Modifier.fillMaxSize().background(Color.Black)) {
+        Text(
+            text = "Camera is not available on Desktop for now.",
+            color = Color.White,
+            modifier = Modifier.align(Alignment.Center)
+        )
+    }
+}

experimental/examples/imageviewer/shared/src/iosMain/kotlin/example/imageviewer/view/CameraView.ios.kt

@@ -0,0 +1,176 @@
+package example.imageviewer.view
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.BoxScope
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material3.*
+import androidx.compose.runtime.*
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.interop.UIKitInteropView
+import androidx.compose.ui.unit.dp
+import kotlinx.cinterop.CValue
+import platform.AVFoundation.*
+import platform.AVFoundation.AVCaptureDeviceDiscoverySession.Companion.discoverySessionWithDeviceTypes
+import platform.AVFoundation.AVCaptureDeviceInput.Companion.deviceInputWithDevice
+import platform.CoreGraphics.CGRect
+import platform.Foundation.NSError
+import platform.QuartzCore.CATransaction
+import platform.QuartzCore.kCATransactionDisableActions
+import platform.UIKit.UIDevice
+import platform.UIKit.UIDeviceOrientation
+import platform.UIKit.UIImage
+import platform.UIKit.UIView
+import platform.darwin.NSObject
+
+private sealed interface CameraAccess {
+    object Undefined : CameraAccess
+    object Denied : CameraAccess
+    object Authorized : CameraAccess
+}
+
+@Composable
+internal actual fun CameraView(modifier: Modifier) {
+    var cameraAccess: CameraAccess by remember { mutableStateOf(CameraAccess.Undefined) }
+    LaunchedEffect(Unit) {
+        when (AVCaptureDevice.authorizationStatusForMediaType(AVMediaTypeVideo)) {
+            AVAuthorizationStatusAuthorized -> {
+                cameraAccess = CameraAccess.Authorized
+            }
+
+            AVAuthorizationStatusDenied, AVAuthorizationStatusRestricted -> {
+                cameraAccess = CameraAccess.Denied
+            }
+
+            AVAuthorizationStatusNotDetermined -> {
+                AVCaptureDevice.requestAccessForMediaType(
+                    mediaType = AVMediaTypeVideo
+                ) { success ->
+                    cameraAccess = if (success) CameraAccess.Authorized else CameraAccess.Denied
+                }
+            }
+        }
+    }
+    Box(
+        Modifier.fillMaxSize().background(Color.Black),
+        contentAlignment = Alignment.Center
+    ) {
+        when (cameraAccess) {
+            CameraAccess.Undefined -> {
+                // Waiting for the user to accept permission
+            }
+
+            CameraAccess.Denied -> {
+                Text("Camera access denied", color = Color.White)
+            }
+
+            CameraAccess.Authorized -> {
+                AuthorizedCamera()
+            }
+        }
+    }
+}
+
+@Composable
+private fun BoxScope.AuthorizedCamera() {
+    val capturePhotoOutput = remember { AVCapturePhotoOutput() }
+    val photoCaptureDelegate = remember {
+        object : NSObject(), AVCapturePhotoCaptureDelegateProtocol {
+            override fun captureOutput(
+                output: AVCapturePhotoOutput,
+                didFinishProcessingPhoto: AVCapturePhoto,
+                error: NSError?
+            ) {
+                val photoData = didFinishProcessingPhoto.fileDataRepresentation()
+                    ?: error("fileDataRepresentation is null")
+                val uiImage = UIImage(photoData)
+                //todo pass image to gallery page
+            }
+        }
+    }
+    val camera: AVCaptureDevice? = remember {
+        discoverySessionWithDeviceTypes(
+            deviceTypes = listOf(AVCaptureDeviceTypeBuiltInWideAngleCamera),
+            mediaType = AVMediaTypeVideo,
+            position = AVCaptureDevicePositionFront,
+        ).devices.firstOrNull() as? AVCaptureDevice
+    }
+    if (camera != null) {
+        val captureSession: AVCaptureSession = remember {
+            AVCaptureSession().also { captureSession ->
+                captureSession.sessionPreset = AVCaptureSessionPresetPhoto
+                val captureDeviceInput: AVCaptureDeviceInput =
+                    deviceInputWithDevice(device = camera, error = null)!!
+                captureSession.addInput(captureDeviceInput)
+                captureSession.addOutput(capturePhotoOutput)
+            }
+        }
+        val cameraPreviewLayer = remember {
+            AVCaptureVideoPreviewLayer(session = captureSession)
+        }
+        UIKitInteropView(
+            modifier = Modifier.fillMaxSize(),
+            background = Color.Black,
+            resize = { view: UIView, rect: CValue<CGRect> ->
+                cameraPreviewLayer.connection?.apply {
+                    videoOrientation = when (UIDevice.currentDevice.orientation) {
+                        UIDeviceOrientation.UIDeviceOrientationPortrait ->
+                            AVCaptureVideoOrientationPortrait
+
+                        UIDeviceOrientation.UIDeviceOrientationLandscapeLeft ->
+                            AVCaptureVideoOrientationLandscapeRight
+
+                        UIDeviceOrientation.UIDeviceOrientationLandscapeRight ->
+                            AVCaptureVideoOrientationLandscapeLeft
+
+                        UIDeviceOrientation.UIDeviceOrientationPortraitUpsideDown ->
+                            AVCaptureVideoOrientationPortraitUpsideDown
+
+                        else -> videoOrientation
+                    }
+                }
+                CATransaction.begin()
+                CATransaction.setValue(true, kCATransactionDisableActions)
+                view.layer.setFrame(rect)
+                cameraPreviewLayer.setFrame(rect)
+                CATransaction.commit()
+            },
+        ) {
+            val cameraContainer = UIView()
+            cameraContainer.layer.addSublayer(cameraPreviewLayer)
+            cameraPreviewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
+            captureSession.startRunning()
+            cameraContainer
+        }
+        Button(
+            modifier = Modifier.align(Alignment.BottomCenter).padding(20.dp),
+            onClick = {
+                val photoSettings = AVCapturePhotoSettings.photoSettingsWithFormat(
+                    format = mapOf(AVVideoCodecKey to AVVideoCodecTypeJPEG)
+                )
+                photoSettings.setHighResolutionPhotoEnabled(true)
+                capturePhotoOutput.setHighResolutionCaptureEnabled(true)
+                capturePhotoOutput.capturePhotoWithSettings(
+                    settings = photoSettings,
+                    delegate = photoCaptureDelegate
+                )
+            }) {
+            Text("Compose Button - take a photo 📸")
+        }
+    } else {
+        SimulatorStub()
+    }
+}
+
+@Composable
+private fun SimulatorStub() {
+    Text(
+        """
+            Camera is not available on simulator.
+            Please try to run on a real iOS device.
+        """.trimIndent(), color = Color.White
+    )
+}