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Merge pull request #1585 from minvws/5664
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10 changes: 10 additions & 0 deletions
10
holder/src/main/java/nl/rijksoverheid/ctr/holder/pdf/PDfPreviewInfo.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,10 @@ | ||
| /* | ||
| * Copyright (c) 2023 De Staat der Nederlanden, Ministerie van Volksgezondheid, Welzijn en Sport. | ||
| * Licensed under the EUROPEAN UNION PUBLIC LICENCE v. 1.2 | ||
| * | ||
| * SPDX-License-Identifier: EUPL-1.2 | ||
| * | ||
| */ | ||
| package nl.rijksoverheid.ctr.holder.pdf | ||
|
|
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| data class PDfPreviewInfo(val content: String, val initialZoom: Int) |
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13 changes: 13 additions & 0 deletions
13
holder/src/main/java/nl/rijksoverheid/ctr/holder/pdf/PdfPreview.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,13 @@ | ||
| /* | ||
| * Copyright (c) 2023 De Staat der Nederlanden, Ministerie van Volksgezondheid, Welzijn en Sport. | ||
| * Licensed under the EUROPEAN UNION PUBLIC LICENCE v. 1.2 | ||
| * | ||
| * SPDX-License-Identifier: EUPL-1.2 | ||
| * | ||
| */ | ||
| package nl.rijksoverheid.ctr.holder.pdf | ||
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| sealed class PdfPreview { | ||
| class Success(val info: PDfPreviewInfo) : PdfPreview() | ||
| object Error : PdfPreview() | ||
| } |
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35 changes: 35 additions & 0 deletions
35
holder/src/main/java/nl/rijksoverheid/ctr/holder/pdf/PdfPreviewViewModel.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,35 @@ | ||
| /* | ||
| * Copyright (c) 2023 De Staat der Nederlanden, Ministerie van Volksgezondheid, Welzijn en Sport. | ||
| * Licensed under the EUROPEAN UNION PUBLIC LICENCE v. 1.2 | ||
| * | ||
| * SPDX-License-Identifier: EUPL-1.2 | ||
| * | ||
| */ | ||
| package nl.rijksoverheid.ctr.holder.pdf | ||
|
|
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| import androidx.lifecycle.MutableLiveData | ||
| import androidx.lifecycle.ViewModel | ||
| import androidx.lifecycle.viewModelScope | ||
| import java.io.File | ||
| import kotlinx.coroutines.launch | ||
| import nl.rijksoverheid.ctr.shared.livedata.Event | ||
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| abstract class PdfPreviewViewModel : ViewModel() { | ||
| val previewLiveData = MutableLiveData<Event<PdfPreview>>() | ||
| abstract fun generatePreview(screenWidth: Int, filesDir: File) | ||
| } | ||
|
|
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| class PdfPreviewViewModelImpl( | ||
| private val previewPdfUseCase: PreviewPdfUseCase | ||
| ) : PdfPreviewViewModel() { | ||
| override fun generatePreview(screenWidth: Int, filesDir: File) { | ||
| viewModelScope.launch { | ||
| val pdfPreviewResult = previewPdfUseCase.generatePreview(screenWidth, filesDir) | ||
| if (pdfPreviewResult != null) { | ||
| previewLiveData.postValue(Event(PdfPreview.Success(pdfPreviewResult))) | ||
| } else { | ||
| previewLiveData.postValue(Event(PdfPreview.Error)) | ||
| } | ||
| } | ||
| } | ||
| } |
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67 changes: 67 additions & 0 deletions
67
holder/src/main/java/nl/rijksoverheid/ctr/holder/pdf/PreviewPdfUseCase.kt
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,67 @@ | ||
| package nl.rijksoverheid.ctr.holder.pdf | ||
|
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| import android.graphics.Bitmap | ||
| import android.graphics.Canvas | ||
| import android.graphics.pdf.PdfRenderer | ||
| import android.os.ParcelFileDescriptor | ||
| import android.util.Base64 | ||
| import java.io.ByteArrayOutputStream | ||
| import java.io.File | ||
| import kotlinx.coroutines.Dispatchers | ||
| import kotlinx.coroutines.withContext | ||
|
|
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| interface PreviewPdfUseCase { | ||
| suspend fun generatePreview(screenWidth: Int, filesDir: File): PDfPreviewInfo? | ||
| } | ||
|
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| class PreviewPdfUseCaseImpl : PreviewPdfUseCase { | ||
| override suspend fun generatePreview(screenWidth: Int, filesDir: File): PDfPreviewInfo? { | ||
| return withContext(Dispatchers.IO) { | ||
| try { | ||
| val pdfFile = File(filesDir, PdfWebViewFragment.pdfFileName) | ||
| val parcelFileDescriptor = | ||
| ParcelFileDescriptor.open(pdfFile, ParcelFileDescriptor.MODE_READ_ONLY) | ||
| val pdfRenderer = PdfRenderer(parcelFileDescriptor) | ||
| val bitmaps = mutableListOf<Bitmap>() | ||
| for (i in 0 until pdfRenderer.pageCount) { | ||
| val currentPage = pdfRenderer.openPage(i) | ||
| val bitmap = Bitmap.createBitmap( | ||
| currentPage.width, | ||
| currentPage.height, | ||
| Bitmap.Config.ARGB_8888 | ||
| ) | ||
| currentPage.render(bitmap, null, null, PdfRenderer.Page.RENDER_MODE_FOR_DISPLAY) | ||
| bitmaps.add(bitmap) | ||
| currentPage.close() | ||
| } | ||
| pdfRenderer.close() | ||
|
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| val bitmapWidth = bitmaps.first().width | ||
| val initialZoom = ((screenWidth.toFloat() / bitmapWidth.toFloat()) * 100).toInt() | ||
|
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| PDfPreviewInfo( | ||
| content = pdfBitmap(bitmaps), | ||
| initialZoom = initialZoom | ||
| ) | ||
| } catch (exception: Exception) { | ||
| null | ||
| } | ||
| } | ||
| } | ||
|
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| private fun pdfBitmap(bitmaps: List<Bitmap>): String { | ||
| val width = bitmaps.first().width | ||
| val pageHeight = bitmaps.first().height | ||
| val height = bitmaps.first().height * bitmaps.size | ||
| val comboBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888) | ||
| val comboImage = Canvas(comboBitmap) | ||
| bitmaps.forEachIndexed { index, bitmap -> | ||
| comboImage.drawBitmap(bitmap, 0f, (index * pageHeight).toFloat(), null) | ||
| } | ||
|
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| val byteArrayOutputStream = ByteArrayOutputStream() | ||
| comboBitmap.compress(Bitmap.CompressFormat.PNG, 100, byteArrayOutputStream) | ||
| val byteArray = byteArrayOutputStream.toByteArray() | ||
| return "data:image/png;base64,${Base64.encodeToString(byteArray, Base64.DEFAULT)}" | ||
| } | ||
| } |
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