Add Resume reading fab

app/src/main/java/org/koitharu/kotatsu/core/exceptions/EmptyHistoryException.kt

@@ -0,0 +1,3 @@
+package org.koitharu.kotatsu.core.exceptions
+
+class EmptyHistoryException : RuntimeException()

app/src/main/java/org/koitharu/kotatsu/domain/history/HistoryRepository.kt

@@ -16,8 +16,8 @@ class HistoryRepository : KoinComponent {
 
 	private val db: MangaDatabase by inject()
 
-	suspend fun getList(offset: Int): List<Manga> {
+	suspend fun getList(offset: Int, limit: Int = 20): List<Manga> {
-		val entities = db.historyDao().findAll(offset, 20)
+		val entities = db.historyDao().findAll(offset, limit)
 		return entities.map { it.manga.toManga(it.tags.map(TagEntity::toMangaTag).toSet()) }
 	}
 

app/src/main/java/org/koitharu/kotatsu/ui/main/MainActivity.kt

@@ -1,14 +1,20 @@
 package org.koitharu.kotatsu.ui.main
 
 import android.content.SharedPreferences
+import android.content.res.ColorStateList
 import android.content.res.Configuration
+import android.graphics.Color
 import android.os.Bundle
 import android.view.Menu
 import android.view.MenuItem
 import androidx.appcompat.app.ActionBarDrawerToggle
+import androidx.core.view.isVisible
 import androidx.fragment.app.Fragment
+import androidx.swiperefreshlayout.widget.CircularProgressDrawable
 import com.google.android.material.navigation.NavigationView
+import com.google.android.material.snackbar.Snackbar
 import kotlinx.android.synthetic.main.activity_main.*
+import moxy.ktx.moxyPresenter
 import org.koin.core.inject
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.core.model.MangaSource
@@ -19,10 +25,16 @@ import org.koitharu.kotatsu.ui.main.list.favourites.FavouritesListFragment
 import org.koitharu.kotatsu.ui.main.list.history.HistoryListFragment
 import org.koitharu.kotatsu.ui.main.list.local.LocalListFragment
 import org.koitharu.kotatsu.ui.main.list.remote.RemoteListFragment
+import org.koitharu.kotatsu.ui.reader.ReaderActivity
+import org.koitharu.kotatsu.ui.reader.ReaderState
 import org.koitharu.kotatsu.ui.settings.SettingsActivity
+import org.koitharu.kotatsu.utils.ext.getDisplayMessage
+import org.koitharu.kotatsu.utils.ext.resolveDp
 
 class MainActivity : BaseActivity(), NavigationView.OnNavigationItemSelectedListener,
-	SharedPreferences.OnSharedPreferenceChangeListener {
+	SharedPreferences.OnSharedPreferenceChangeListener, MainView {
+
+	private val presenter by moxyPresenter(factory = ::MainPresenter)
 
 	private val settings by inject<AppSettings>()
 	private lateinit var drawerToggle: ActionBarDrawerToggle
@@ -40,7 +52,15 @@ class MainActivity : BaseActivity(), NavigationView.OnNavigationItemSelectedList
 		navigationView.setNavigationItemSelectedListener(this)
 		settings.subscribe(this)
 
-		if (supportFragmentManager.findFragmentById(R.id.container) == null) {
+		fab.imageTintList = ColorStateList.valueOf(Color.WHITE)
+		fab.isVisible = true
+		fab.setOnClickListener {
+			presenter.openLastReader()
+		}
+
+		supportFragmentManager.findFragmentById(R.id.container)?.let {
+			fab.isVisible = it is HistoryListFragment
+		} ?: run {
 			navigationView.setCheckedItem(R.id.nav_history)
 			setPrimaryFragment(HistoryListFragment.newInstance())
 		}
@@ -91,6 +111,27 @@ class MainActivity : BaseActivity(), NavigationView.OnNavigationItemSelectedList
 		return true
 	}
 
+	override fun onOpenReader(state: ReaderState) {
+		startActivity(ReaderActivity.newIntent(this, state))
+	}
+
+	override fun onError(e: Throwable) {
+		Snackbar.make(container, e.getDisplayMessage(resources), Snackbar.LENGTH_SHORT).show()
+	}
+
+	override fun onLoadingStateChanged(isLoading: Boolean) {
+		fab.isEnabled = !isLoading
+		if (isLoading) {
+			fab.setImageDrawable(CircularProgressDrawable(this).also {
+				it.setColorSchemeColors(Color.WHITE)
+				it.strokeWidth = resources.resolveDp(2f)
+				it.start()
+			})
+		} else {
+			fab.setImageResource(R.drawable.ic_read_fill)
+		}
+	}
+
 	private fun initSideMenu(remoteSources: List<MangaSource>) {
 		val submenu = navigationView.menu.findItem(R.id.nav_remote_sources).subMenu
 		submenu.removeGroup(R.id.group_remote_sources)
@@ -110,5 +151,6 @@ class MainActivity : BaseActivity(), NavigationView.OnNavigationItemSelectedList
 		supportFragmentManager.beginTransaction()
 			.replace(R.id.container, fragment)
 			.commit()
+		fab.isVisible = fragment is HistoryListFragment
 	}
 }

app/src/main/java/org/koitharu/kotatsu/ui/main/MainPresenter.kt

@@ -0,0 +1,41 @@
+package org.koitharu.kotatsu.ui.main
+
+import kotlinx.coroutines.CancellationException
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+import moxy.InjectViewState
+import moxy.presenterScope
+import org.koitharu.kotatsu.core.exceptions.EmptyHistoryException
+import org.koitharu.kotatsu.domain.MangaProviderFactory
+import org.koitharu.kotatsu.domain.history.HistoryRepository
+import org.koitharu.kotatsu.ui.common.BasePresenter
+import org.koitharu.kotatsu.ui.reader.ReaderState
+
+@InjectViewState
+class MainPresenter : BasePresenter<MainView>() {
+
+	fun openLastReader() {
+		presenterScope.launch {
+			viewState.onLoadingStateChanged(isLoading = true)
+			try {
+				val state = withContext(Dispatchers.IO) {
+					val repo = HistoryRepository()
+					val manga = repo.getList(0, 1).firstOrNull()
+						?: throw EmptyHistoryException()
+					val history = repo.getOne(manga) ?: throw EmptyHistoryException()
+					ReaderState(
+						MangaProviderFactory.create(manga.source).getDetails(manga),
+						history.chapterId, history.page
+					)
+				}
+				viewState.onOpenReader(state)
+			} catch (_: CancellationException) {
+			} catch (e: Throwable) {
+				viewState.onError(e)
+			} finally {
+				viewState.onLoadingStateChanged(isLoading = false)
+			}
+		}
+	}
+}

app/src/main/java/org/koitharu/kotatsu/ui/main/MainView.kt

@@ -0,0 +1,12 @@
+package org.koitharu.kotatsu.ui.main
+
+import moxy.viewstate.strategy.alias.OneExecution
+import org.koitharu.kotatsu.core.model.MangaState
+import org.koitharu.kotatsu.ui.common.BaseMvpView
+import org.koitharu.kotatsu.ui.reader.ReaderState
+
+interface MainView : BaseMvpView {
+
+	@OneExecution
+	fun onOpenReader(state: ReaderState)
+}

app/src/main/java/org/koitharu/kotatsu/ui/main/list/history/HistoryListFragment.kt

@@ -1,9 +1,14 @@
 package org.koitharu.kotatsu.ui.main.list.history
 
+import android.content.res.ColorStateList
+import android.graphics.Color
+import android.os.Bundle
 import android.view.Menu
 import android.view.MenuInflater
 import android.view.MenuItem
+import android.view.View
 import androidx.appcompat.app.AlertDialog
+import androidx.core.view.isVisible
 import com.google.android.material.snackbar.Snackbar
 import kotlinx.android.synthetic.main.fragment_list.*
 import moxy.ktx.moxyPresenter

app/src/main/java/org/koitharu/kotatsu/utils/ext/CommonExt.kt

@@ -4,6 +4,7 @@ import android.content.res.Resources
 import kotlinx.coroutines.delay
 import org.koitharu.kotatsu.BuildConfig
 import org.koitharu.kotatsu.R
+import org.koitharu.kotatsu.core.exceptions.EmptyHistoryException
 import org.koitharu.kotatsu.core.exceptions.UnsupportedFileException
 import java.io.IOException
 
@@ -35,6 +36,7 @@ suspend inline fun <T, R> T.retryUntilSuccess(maxAttempts: Int, action: T.() ->
 fun Throwable.getDisplayMessage(resources: Resources) = when (this) {
 	is UnsupportedOperationException -> resources.getString(R.string.operation_not_supported)
 	is UnsupportedFileException -> resources.getString(R.string.text_file_not_supported)
+	is EmptyHistoryException -> resources.getString(R.string.history_is_empty)
 	is IOException -> resources.getString(R.string.network_error)
 	else -> if (BuildConfig.DEBUG) {
 		message ?: resources.getString(R.string.error_occurred)

app/src/main/res/drawable/ic_read_fill.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector
+	xmlns:android="http://schemas.android.com/apk/res/android"
+	android:width="24dp"
+	android:height="24dp"
+	android:tint="?attr/colorControlNormal"
+	android:viewportWidth="24"
+	android:viewportHeight="24">
+	<path
+		android:fillColor="#000"
+		android:pathData="M12,8A3,3 0 0,0 15,5A3,3 0 0,0 12,2A3,3 0 0,0 9,5A3,3 0 0,0 12,8M12,11.54C9.64,9.35 6.5,8 3,8V19C6.5,19 9.64,20.35 12,22.54C14.36,20.35 17.5,19 21,19V8C17.5,8 14.36,9.35 12,11.54Z" />
+</vector>

app/src/main/res/layout/activity_main.xml

@@ -34,6 +34,20 @@
             android:layout_height="match_parent"
             app:layout_behavior="com.google.android.material.appbar.AppBarLayout$ScrollingViewBehavior" />
 
+        <com.google.android.material.floatingactionbutton.FloatingActionButton
+            android:id="@+id/fab"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_margin="16dp"
+            android:src="@drawable/ic_read_fill"
+            android:visibility="gone"
+            app:fabSize="normal"
+            app:backgroundTint="?colorAccent"
+            app:layout_anchor="@id/container"
+            app:layout_anchorGravity="bottom|end"
+            app:layout_behavior="com.google.android.material.behavior.HideBottomViewOnScrollBehavior"
+            tools:visibility="visible" />
+
     </androidx.coordinatorlayout.widget.CoordinatorLayout>
 
     <com.google.android.material.navigation.NavigationView

app/src/main/res/layout/fragment_list.xml

@@ -5,8 +5,7 @@
 	xmlns:tools="http://schemas.android.com/tools"
 	android:id="@+id/drawer"
 	android:layout_width="match_parent"
-	android:layout_height="match_parent"
+	android:layout_height="match_parent">
-	tools:openDrawer="end">
 
 	<FrameLayout
 		android:layout_width="match_parent"
@@ -44,8 +43,8 @@
 				android:layout_height="wrap_content"
 				android:layout_gravity="center"
 				android:gravity="center"
-				android:textColor="?android:textColorSecondary"
 				android:textAppearance="?android:textAppearanceMedium"
+				android:textColor="?android:textColorSecondary"
 				tools:text="@tools:sample/lorem[3]" />
 
 		</LinearLayout>