Internal-270 Feature base classes and view state

pdf-viewer/.gitignore

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+/build

pdf-viewer/build.gradle

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+plugins {
+    id 'com.android.library'
+    id 'org.jetbrains.kotlin.android'
+}
+
+android {
+    compileSdk 31
+
+    defaultConfig {
+        minSdk 23
+        targetSdk 31
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+        consumerProguardFiles "consumer-rules.pro"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+}
+
+dependencies {
+
+    implementation 'androidx.core:core-ktx:1.7.0'
+    implementation 'androidx.appcompat:appcompat:1.4.1'
+    implementation 'com.google.android.material:material:1.5.0'
+    testImplementation 'junit:junit:4.13.2'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
+}

pdf-viewer/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest package="ru.touchin.roboswag.pdf_viewer"> </manifest>

pdf-viewer/src/main/java/ru/touchin/roboswag/pdf_viewer/extensions/PdfRendereExt.kt

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+package ru.touchin.roboswag.pdf_reader.extensions
+
+import android.graphics.Bitmap
+import android.graphics.Canvas
+import android.graphics.Color
+import android.graphics.pdf.PdfRenderer
+
+fun PdfRenderer.Page.renderBitmap(width: Int) = use {
+    val bitmap = createBitmap(width)
+    render(bitmap, null, null, PdfRenderer.Page.RENDER_MODE_FOR_DISPLAY)
+    bitmap
+}
+
+private fun PdfRenderer.Page.createBitmap(bitmapWidth: Int): Bitmap {
+    val bitmap = Bitmap.createBitmap(
+        bitmapWidth, (bitmapWidth.toFloat() / width * height).toInt(), Bitmap.Config.ARGB_8888
+    )
+
+    val canvas = Canvas(bitmap)
+    canvas.drawColor(Color.WHITE)
+    canvas.drawBitmap(bitmap, 0f, 0f, null)
+
+    return bitmap
+}

pdf-viewer/src/main/java/ru/touchin/roboswag/pdf_viewer/repository/PdfViewRepository.kt

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+package ru.touchin.roboswag.pdf_reader.repository
+
+import android.graphics.Bitmap
+import java.io.File
+
+interface PdfViewRepository {
+
+    suspend fun renderSinglePage(filePath: String, width: Int) : Bitmap
+
+}

pdf-viewer/src/main/java/ru/touchin/roboswag/pdf_viewer/ui/base/BaseFragment.kt

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+package ru.touchin.roboswag.pdf_reader.ui.base
+
+import android.graphics.Bitmap
+import android.os.Bundle
+import android.view.View
+import android.widget.Toast
+import androidx.fragment.app.Fragment
+import ru.touchin.roboswag.pdf_reader.viewstate.PdfReaderViewState
+import ru.touchin.roboswag.pdf_reader.BaseViewModel
+import java.io.File
+
+abstract class BaseFragment<VM : BaseViewModel> : Fragment() {
+
+    abstract val viewModel: VM
+
+    protected open fun renderData(state: PdfReaderViewState) {
+        when (state) {
+            is PdfReaderViewState.RenderingSuccess -> renderSuccess(state.data)
+            is PdfReaderViewState.Error -> renderError(state.error)
+            is PdfReaderViewState.Loading -> setLoading(true)
+        }
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        viewModel.stateLiveData.observe(viewLifecycleOwner) { state ->
+            renderData(state)
+        }
+
+    }
+
+    protected open fun renderSuccess(bitmap: Bitmap) {
+        setLoading(false)
+    }
+
+    protected open fun renderError(error: Throwable) {
+        setLoading(false)
+        error.message?.let { showMessage(it) }
+    }
+
+    protected open fun renderMessage(message: String) {
+        setLoading(false)
+        showMessage(message)
+    }
+
+    protected open fun setLoading(isLoading: Boolean) {
+    }
+
+    private fun showMessage(message: String) {
+        Toast.makeText(
+            requireContext(),
+            message,
+            Toast.LENGTH_LONG
+        ).show()
+    }
+
+}

pdf-viewer/src/main/java/ru/touchin/roboswag/pdf_viewer/viewmodel/BaseViewModel.kt

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+package ru.touchin.roboswag.pdf_reader.viewmodel
+
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.ViewModel
+import ru.touchin.roboswag.pdf_reader.viewstate.PdfReaderViewState
+import kotlinx.coroutines.CoroutineExceptionHandler
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.async
+import kotlinx.coroutines.cancelChildren
+import kotlinx.coroutines.launch
+
+abstract class BaseViewModel(
+) : ViewModel() {
+
+    protected val mStateLiveData = MutableLiveData<PdfReaderViewState>()
+    val stateLiveData get() = mStateLiveData as LiveData<PdfReaderViewState>
+
+    private val viewModelCoroutineScope = CoroutineScope(
+        Dispatchers.IO
+                + SupervisorJob()
+                + CoroutineExceptionHandler { _, throwable ->
+            handleError(throwable)
+        })
+
+    override fun onCleared() {
+        super.onCleared()
+        cancelJob()
+    }
+
+    protected open fun cancelJob() {
+        viewModelCoroutineScope.coroutineContext.cancelChildren()
+    }
+
+    private fun handleError(error: Throwable) {
+        mStateLiveData.postValue(PdfReaderViewState.Error(error))
+    }
+
+    protected fun runAsync(block: suspend () -> Unit) =
+        viewModelCoroutineScope.launch {
+            block()
+        }
+
+}

pdf-viewer/src/main/java/ru/touchin/roboswag/pdf_viewer/viewmodel/PdfViewModel.kt

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+package ru.touchin.roboswag.pdf_reader.viewmodel
+
+import ru.touchin.roboswag.pdf_reader.viewstate.PdfReaderViewState
+import ru.touchin.roboswag.pdf_reader.repository.PdfViewRepository
+
+class PdfViewModel(private val repository: PdfViewRepository) : BaseViewModel() {
+
+    fun renderPage(filePath: String, width: Int) {
+        mStateLiveData.postValue(PdfReaderViewState.Loading(true))
+        runAsync {
+            val bitmap = repository.renderSinglePage(filePath, width)
+            mStateLiveData.postValue(PdfReaderViewState.RenderingSuccess(bitmap))
+        }
+    }
+
+}

pdf-viewer/src/main/java/ru/touchin/roboswag/pdf_viewer/viewstate/PdfReaderViewState.kt

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+package ru.touchin.roboswag.pdf_reader.viewstate
+
+import android.graphics.Bitmap
+import java.io.File
+
+sealed class PdfReaderViewState {
+    data class RenderingSuccess(val data: Bitmap) : PdfReaderViewState()
+    data class Error(val error: Throwable) : PdfReaderViewState()
+    data class Loading(val isLoading: Boolean) : PdfReaderViewState()
+}