Added the option to hide or not toolbar when scrolling

app/src/main/java/org/koitharu/kotatsu/base/ui/BaseActivity.kt

@@ -15,6 +15,8 @@ import androidx.core.content.ContextCompat
 import androidx.core.graphics.Insets
 import androidx.core.view.*
 import androidx.viewbinding.ViewBinding
+import com.google.android.material.appbar.AppBarLayout
+import com.google.android.material.appbar.AppBarLayout.LayoutParams.*
 import org.koin.android.ext.android.get
 import org.koitharu.kotatsu.BuildConfig
 import org.koitharu.kotatsu.R
@@ -57,7 +59,13 @@ abstract class BaseActivity<B : ViewBinding> : AppCompatActivity(), OnApplyWindo
 		this.binding = binding
 		super.setContentView(binding.root)
 		(binding.root.findViewById<View>(R.id.toolbar) as? Toolbar)?.let(this::setSupportActionBar)
+		val params = (binding.root.findViewById<View>(R.id.toolbar) as? Toolbar)?.layoutParams as AppBarLayout.LayoutParams
 		ViewCompat.setOnApplyWindowInsetsListener(binding.root, this)
+		if (get<AppSettings>().isToolbarHideWhenScrolling) {
+			params.scrollFlags = SCROLL_FLAG_SCROLL or SCROLL_FLAG_ENTER_ALWAYS
+		} else {
+			params.scrollFlags = SCROLL_FLAG_NO_SCROLL
+		}
 	}
 
 	override fun onApplyWindowInsets(v: View, insets: WindowInsetsCompat): WindowInsetsCompat {

app/src/main/java/org/koitharu/kotatsu/core/prefs/AppSettings.kt

@@ -41,6 +41,8 @@ class AppSettings private constructor(private val prefs: SharedPreferences) :
 
 	val isAmoledTheme by BoolPreferenceDelegate(KEY_THEME_AMOLED, defaultValue = false)
 
+	val isToolbarHideWhenScrolling by BoolPreferenceDelegate(KEY_HIDE_TOOLBAR, defaultValue = true)
+
 	var gridSize by IntPreferenceDelegate(KEY_GRID_SIZE, defaultValue = 100)
 
 	val readerPageSwitch by StringSetPreferenceDelegate(
@@ -147,6 +149,7 @@ class AppSettings private constructor(private val prefs: SharedPreferences) :
 		const val KEY_APP_SECTION = "app_section"
 		const val KEY_THEME = "theme"
 		const val KEY_THEME_AMOLED = "amoled_theme"
+		const val KEY_HIDE_TOOLBAR = "hide_toolbar"
 		const val KEY_SOURCES_ORDER = "sources_order"
 		const val KEY_SOURCES_HIDDEN = "sources_hidden"
 		const val KEY_TRAFFIC_WARNING = "traffic_warning"

app/src/main/java/org/koitharu/kotatsu/settings/MainSettingsFragment.kt

@@ -73,6 +73,9 @@ class MainSettingsFragment : BasePreferenceFragment(R.string.settings),
 			AppSettings.KEY_THEME_AMOLED -> {
 				findPreference<Preference>(key)?.setSummary(R.string.restart_required)
 			}
+			AppSettings.KEY_HIDE_TOOLBAR -> {
+				findPreference<SwitchPreference>(key)?.setSummary(R.string.restart_required)
+			}
 			AppSettings.KEY_LOCAL_STORAGE -> {
 				findPreference<Preference>(key)?.run {
 					summary = settings.getStorageDir(context)?.getStorageName(context)

app/src/main/res/values-be/strings.xml

@@ -207,4 +207,5 @@
 	<string name="protect_application_subtitle">Калі ласка, увядзіце пароль, які спатрэбіцца пры запуску прыкладання</string>
 	<string name="confirm">Пацвярджаць</string>
 	<string name="password_length_hint">Пароль павінен змяшчаць не менш за 4 сімвалаў</string>
+	<string name="hide_toolbar">Схаваць загаловак пры прагортцы</string>
 </resources>

app/src/main/res/values-ru/strings.xml

@@ -205,4 +205,5 @@
 	<string name="protect_application_subtitle">Введите пароль, который вам понадобится при запуске приложения</string>
 	<string name="confirm">Confirm</string>
 	<string name="password_length_hint">Пароль должен содержать не менее 4 символов</string>
+	<string name="hide_toolbar">Прятать заголовок при прокрутке</string>
 </resources>

app/src/main/res/values/strings.xml

@@ -207,4 +207,5 @@
 	<string name="protect_application_subtitle">Enter password that will be required when the application starts</string>
 	<string name="confirm">Confirm</string>
 	<string name="password_length_hint">Password must be at least 4 characters</string>
+	<string name="hide_toolbar">Hide toolbar when scrolling</string>
 </resources>

app/src/main/res/xml/pref_main.xml

@@ -20,6 +20,12 @@
 		android:title="@string/black_dark_theme"
 		app:iconSpaceReserved="false" />
 
+	<SwitchPreference
+		android:defaultValue="true"
+		android:key="hide_toolbar"
+		android:title="@string/hide_toolbar"
+		app:iconSpaceReserved="false" />
+
 	<ListPreference
 		android:entries="@array/list_modes"
 		android:key="list_mode_2"