Refactors detail view to use ViewModel #37
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,139 @@ | ||
| package de.berlindroid.zepatch | ||
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|
||
| import android.app.Application | ||
| import android.graphics.Bitmap | ||
| import android.graphics.BitmapFactory | ||
| import androidx.compose.ui.graphics.ImageBitmap | ||
| import androidx.compose.ui.graphics.asAndroidBitmap | ||
| import androidx.compose.ui.graphics.asImageBitmap | ||
| import androidx.core.graphics.scale | ||
| import androidx.lifecycle.AndroidViewModel | ||
| import androidx.lifecycle.viewModelScope | ||
| import com.embroidermodder.punching.Histogram | ||
| import com.embroidermodder.punching.reduceColors | ||
| import de.berlindroid.zepatch.PatchablePreviewMode.COMPOSABLE | ||
| import de.berlindroid.zepatch.stiches.StitchToPES | ||
| import kotlinx.coroutines.Dispatchers | ||
| import kotlinx.coroutines.flow.MutableStateFlow | ||
| import kotlinx.coroutines.flow.StateFlow | ||
| import kotlinx.coroutines.flow.asStateFlow | ||
| import kotlinx.coroutines.flow.update | ||
| import kotlinx.coroutines.launch | ||
|
|
||
| /** | ||
| * ViewModel to manage the Wizard screen state. | ||
|
|
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| */ | ||
|
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| class WizardViewModel(application: Application) : AndroidViewModel(application) { | ||
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| data class UIState( | ||
| val imageBitmap: ImageBitmap? = null, | ||
| val reducedImageBitmap: ImageBitmap? = null, | ||
| val reducedHistogram: Histogram? = null, | ||
| val colorCount: Int = 3, | ||
| val embroideryData: ByteArray? = null, | ||
| val embroideryPreviewImage: ImageBitmap? = null, | ||
| val creatingEmbroidery: Boolean = false, | ||
| val error: String? = null, | ||
| val previewMode: PatchablePreviewMode = COMPOSABLE, | ||
| ) | ||
|
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| private val _uiState = MutableStateFlow(UIState()) | ||
| val uiState: StateFlow<UIState> = _uiState.asStateFlow() | ||
|
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| /** Resets the whole wizard state back to initial defaults. */ | ||
| fun reset() { | ||
| _uiState.update { UIState() } | ||
| } | ||
|
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| fun setPreviewMode(mode: PatchablePreviewMode) { | ||
| _uiState.update { it.copy(previewMode = mode) } | ||
| } | ||
|
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| fun updateColorCount(count: Int) { | ||
| _uiState.update { it.copy(colorCount = count) } | ||
| } | ||
|
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| fun updateBitmap(bitmap: ImageBitmap) { | ||
| _uiState.update { | ||
| it.copy( | ||
| imageBitmap = bitmap, | ||
| // Reset downstream results when source bitmap changes | ||
| reducedImageBitmap = null, | ||
| reducedHistogram = null, | ||
| embroideryData = null, | ||
| embroideryPreviewImage = null, | ||
| ) | ||
| } | ||
| } | ||
|
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| fun computeReducedBitmap() { | ||
| val state = _uiState.value | ||
| val image = state.imageBitmap ?: return | ||
| val colorCount = state.colorCount | ||
| viewModelScope.launch(Dispatchers.IO) { | ||
| val aspect = image.width / image.height.toFloat() | ||
| val (reducedBmp, histogram) = image.asAndroidBitmap() | ||
| .copy(Bitmap.Config.ARGB_8888, false) | ||
| .scale((512 * aspect).toInt(), 512, false) | ||
| .reduceColors(colorCount) | ||
|
|
||
| _uiState.update { | ||
| it.copy( | ||
| reducedImageBitmap = reducedBmp.asImageBitmap(), | ||
| reducedHistogram = histogram, | ||
| ) | ||
| } | ||
| } | ||
| } | ||
|
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| fun createEmbroidery( | ||
| name: String, | ||
| bitmap: ImageBitmap, | ||
| histogram: Histogram, | ||
| ) { | ||
| viewModelScope.launch(Dispatchers.IO) { | ||
| try { | ||
| _uiState.update { it.copy(creatingEmbroidery = true, error = null) } | ||
|
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| val aspect = bitmap.width / bitmap.height.toFloat() | ||
| val embroidery = StitchToPES.createEmbroideryFromBitmap( | ||
| name = name, | ||
| bitmap = bitmap.asAndroidBitmap(), | ||
| histogram = histogram, | ||
| mmWidth = 500f * aspect, | ||
| mmHeight = 500f, | ||
| mmDensityX = 4f, | ||
| mmDensityY = 2f, | ||
| ) | ||
|
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| val context = getApplication<Application>().applicationContext | ||
| val pes = StitchToPES.convert(context, embroidery) | ||
| val png = StitchToPES.convert(context, embroidery, "png") | ||
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| val previewImage = if (png == null || png.isEmpty()) { | ||
| null | ||
| } else { | ||
| val decoded = BitmapFactory.decodeByteArray(png, 0, png.size) | ||
| decoded.scale(decoded.width * 2, decoded.height * 2).asImageBitmap() | ||
| } | ||
|
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| _uiState.update { | ||
| it.copy( | ||
| embroideryData = pes, | ||
| embroideryPreviewImage = previewImage, | ||
| creatingEmbroidery = false, | ||
| ) | ||
| } | ||
| } catch (t: Throwable) { | ||
| _uiState.update { | ||
| it.copy( | ||
| creatingEmbroidery = false, | ||
| error = t.message ?: t.toString(), | ||
| ) | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| } | ||
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Nit pick: should that also be
onComputeReducedBitmap? Consistency with the other names, or does work differently, hence the difference in naming?Uh oh!
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for
onBitmapUpdatedandonColorCountUpdatedwe ask the composable to do something and it calls these methods when it completes the task.on the other hand the
computeReducedBitmapis an imperative action which we are asking and external function to perform, in this case the ViewModel.BUT I see a nit myself, I am not consistently using color vs colour. very irritating, I will fix it.Fake news it is ok