111 lines
5.0 KiB
Kotlin
111 lines
5.0 KiB
Kotlin
package de.jadehs.strassenschadenpro2
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import android.graphics.Bitmap
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import android.graphics.BitmapFactory
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import android.graphics.ImageDecoder
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import androidx.compose.ui.graphics.ImageBitmap
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import androidx.compose.ui.graphics.asImageBitmap
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import androidx.core.content.FileProvider
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import androidx.lifecycle.ViewModel
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import androidx.lifecycle.viewModelScope
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import de.jadehs.strassenschadenpro2.components.album.AlbumViewState
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import de.jadehs.strassenschadenpro2.components.album.Intent
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import kotlinx.coroutines.flow.MutableStateFlow
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import kotlinx.coroutines.flow.StateFlow
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import kotlinx.coroutines.launch
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import java.io.File
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import kotlin.coroutines.CoroutineContext
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class AlbumViewModel(private val coroutineContext: CoroutineContext): ViewModel() {
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//region View State
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private val _albumViewState: MutableStateFlow<AlbumViewState> = MutableStateFlow(AlbumViewState())
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// exposes the ViewState to the composable view
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val viewStateFlow: StateFlow<AlbumViewState>
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get() = _albumViewState
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// endregion
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// region Intents
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// receives user generated events and processes them in the provided coroutine context
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fun onReceive(intent: Intent) = viewModelScope.launch(coroutineContext) {
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when(intent) {
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is Intent.OnPermissionGrantedWith -> {
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// Create an empty image file in the app's cache directory
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val tempFile = File.createTempFile(
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"temp_image_file_", /* prefix */
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".jpg", /* suffix */
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intent.compositionContext.cacheDir /* cache directory */
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)
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// Create sandboxed url for this temp file - needed for the camera API
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val uri = FileProvider.getUriForFile(intent.compositionContext,
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"${BuildConfig.APPLICATION_ID}.provider", /* needs to match the provider information in the manifest */
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tempFile
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)
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_albumViewState.value = _albumViewState.value.copy(tempFileUrl = uri)
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}
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is Intent.OnPermissionDenied -> {
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// maybe log the permission denial event
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println("User did not grant permission to use the camera")
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}
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is Intent.OnFinishPickingImagesWith -> {
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if (intent.imageUrls.isNotEmpty()) {
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// Handle picked images
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val newImages = mutableListOf<ImageBitmap>()
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val imageUriList = _albumViewState.value.imageUris.toMutableList()
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for (eachImageUrl in intent.imageUrls) {
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val inputStream = intent.compositionContext.contentResolver.openInputStream(eachImageUrl)
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val bytes = inputStream?.readBytes()
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inputStream?.close()
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if (bytes != null) {
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val bitmapOptions = BitmapFactory.Options()
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bitmapOptions.inMutable = true
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val bitmap: Bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.size, bitmapOptions)
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newImages.add(bitmap.asImageBitmap())
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imageUriList.add(eachImageUrl)
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} else {
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// error reading the bytes from the image url
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println("The image that was picked could not be read from the device at this url: $eachImageUrl")
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}
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}
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val currentViewState = _albumViewState.value
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val newCopy = currentViewState.copy(
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selectedPictures = (currentViewState.selectedPictures + newImages),
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tempFileUrl = null,
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imageUris = imageUriList
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)
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_albumViewState.value = newCopy
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} else {
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// user did not pick anything
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}
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}
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is Intent.OnImageSavedWith -> {
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val tempImageUrl = _albumViewState.value.tempFileUrl
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if (tempImageUrl != null) {
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val source = ImageDecoder.createSource(intent.compositionContext.contentResolver, tempImageUrl)
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val currentPictures = _albumViewState.value.selectedPictures.toMutableList()
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currentPictures.add(ImageDecoder.decodeBitmap(source).asImageBitmap())
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val photoUriList = _albumViewState.value.imageUris.toMutableList()
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photoUriList.add(tempImageUrl)
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_albumViewState.value = _albumViewState.value.copy(
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tempFileUrl = null,
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selectedPictures = currentPictures,
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imageUris = photoUriList
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)
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}
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}
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is Intent.OnImageSavingCanceled -> {
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_albumViewState.value = _albumViewState.value.copy(tempFileUrl = null)
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}
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}
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}
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// endregion
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} |