Add comments

app/src/main/java/emu/skyline/AppDialog.kt

@@ -96,7 +96,7 @@ class AppDialog : BottomSheetDialogFragment() {
 
         game_pin.setOnClickListener {
             val info = ShortcutInfo.Builder(context, item.title)
-            info.setShortLabel(item.meta.name)
+            info.setShortLabel(item.title)
             info.setActivity(ComponentName(requireContext(), EmulationActivity::class.java))
             info.setIcon(Icon.createWithAdaptiveBitmap(item.icon ?: missingIcon))
 

app/src/main/java/emu/skyline/EmulationActivity.kt

@@ -164,7 +164,7 @@ class EmulationActivity : AppCompatActivity(), SurfaceHolder.Callback, View.OnTo
     }
 
     /**
-     * This executes the specified ROM, [preferenceFd] is assumed to be valid beforehand
+     * This executes the specified ROM
      *
      * @param rom The URI of the ROM to execute
      */
@@ -186,7 +186,7 @@ class EmulationActivity : AppCompatActivity(), SurfaceHolder.Callback, View.OnTo
     }
 
     /**
-     * This makes the window fullscreen then sets up [preferenceFd], sets up the performance statistics and finally calls [executeApplication] for executing the application
+     * This makes the window fullscreen, sets up the performance statistics and finally calls [executeApplication] for executing the application
      */
     @SuppressLint("SetTextI18n")
     override fun onCreate(savedInstanceState : Bundle?) {
@@ -415,7 +415,7 @@ class EmulationActivity : AppCompatActivity(), SurfaceHolder.Callback, View.OnTo
             else -> error("Invalid button id")
         }
         setAxisValue(0, stickId.xAxis.ordinal, (position.x * Short.MAX_VALUE).toInt())
-        setAxisValue(0, stickId.yAxis.ordinal, (-position.y * Short.MAX_VALUE).toInt()) // Y is inverted
+        setAxisValue(0, stickId.yAxis.ordinal, (-position.y * Short.MAX_VALUE).toInt()) // Y is inverted, since drawing starts from top left
     }
 
     @SuppressLint("WrongConstant")

app/src/main/java/emu/skyline/MainActivity.kt

@@ -31,9 +31,8 @@ import emu.skyline.adapter.GenericAdapter
 import emu.skyline.adapter.HeaderViewItem
 import emu.skyline.adapter.LayoutType
 import emu.skyline.data.AppItem
-import emu.skyline.data.BaseElement
+import emu.skyline.data.DataItem
-import emu.skyline.data.BaseHeader
+import emu.skyline.data.HeaderItem
-import emu.skyline.data.ElementType
 import emu.skyline.loader.LoaderResult
 import emu.skyline.loader.RomFile
 import emu.skyline.loader.RomFormat
@@ -71,7 +70,7 @@ class MainActivity : AppCompatActivity() {
     /**
      * This adds all files in [directory] with [extension] as an entry in [adapter] using [RomFile] to load metadata
      */
-    private fun addEntries(extension : String, romFormat : RomFormat, directory : DocumentFile, romElements : ArrayList<BaseElement>, found : Boolean = false) : Boolean {
+    private fun addEntries(extension : String, romFormat : RomFormat, directory : DocumentFile, romElements : ArrayList<DataItem>, found : Boolean = false) : Boolean {
         var foundCurrent = found
 
         directory.listFiles().forEach { file ->
@@ -83,7 +82,7 @@ class MainActivity : AppCompatActivity() {
                         val finalFoundCurrent = foundCurrent
                         runOnUiThread {
                             if (!finalFoundCurrent) {
-                                romElements.add(BaseHeader(romFormat.name))
+                                romElements.add(HeaderItem(romFormat.name))
                                 adapter.addItem(HeaderViewItem(romFormat.name))
                             }
 
@@ -111,8 +110,8 @@ class MainActivity : AppCompatActivity() {
 
         if (loadFromFile) {
             try {
-                loadSerializedList<BaseElement>(romsFile).forEach {
+                loadSerializedList<DataItem>(romsFile).forEach {
-                    if (it.elementType == ElementType.Header && it is BaseHeader)
+                    if (it is HeaderItem)
                         adapter.addItem(HeaderViewItem(it.title))
                     else if (it is AppItem)
                         adapter.addItem(it.toViewItem())
@@ -136,7 +135,7 @@ class MainActivity : AppCompatActivity() {
 
                 val searchLocation = DocumentFile.fromTreeUri(this, Uri.parse(settings.searchLocation))!!
 
-                val romElements = ArrayList<BaseElement>()
+                val romElements = ArrayList<DataItem>()
                 addEntries("nro", RomFormat.NRO, searchLocation, romElements)
                 addEntries("nso", RomFormat.NSO, searchLocation, romElements)
                 addEntries("nca", RomFormat.NCA, searchLocation, romElements)
@@ -144,7 +143,7 @@ class MainActivity : AppCompatActivity() {
 
                 runOnUiThread {
                     if (romElements.isEmpty()) {
-                        romElements.add(BaseHeader(getString(R.string.no_rom)))
+                        romElements.add(HeaderItem(getString(R.string.no_rom)))
                         adapter.addItem(HeaderViewItem(getString(R.string.no_rom)))
                     }
 

app/src/main/java/emu/skyline/SkylineApplication.kt

@@ -8,6 +8,9 @@ package emu.skyline
 import android.app.Application
 import emu.skyline.input.InputManager
 
+/**
+ * Custom application class to initialize [InputManager]
+ */
 class SkylineApplication : Application() {
     override fun onCreate() {
         super.onCreate()

app/src/main/java/emu/skyline/adapter/AppViewItem.kt

@@ -69,5 +69,5 @@ class AppViewItem(var layoutType : LayoutType, private val item : AppItem, priva
         builder.show()
     }
 
-    override fun toString() = item.key()
+    override fun key() = item.key()
 }

app/src/main/java/emu/skyline/adapter/GenericAdapter.kt

@@ -13,6 +13,9 @@ import info.debatty.java.stringsimilarity.Cosine
 import info.debatty.java.stringsimilarity.JaroWinkler
 import java.util.*
 
+/**
+ * Can handle any view types with [GenericViewHolderBinder] implemented, [GenericViewHolderBinder] are differentiated by the return value of [GenericViewHolderBinder.getLayoutFactory]
+ */
 class GenericAdapter : RecyclerView.Adapter<GenericViewHolder>(), Filterable {
     var currentSearchTerm = ""
 
@@ -70,7 +73,7 @@ class GenericAdapter : RecyclerView.Adapter<GenericViewHolder>(), Filterable {
          * This sorts the items in [allItems] in relation to how similar they are to [currentSearchTerm]
          */
         fun extractSorted() = allItems.mapNotNull { item ->
-            item.toString().toLowerCase(Locale.getDefault()).let {
+            item.key().toLowerCase(Locale.getDefault()).let {
                 val similarity = (jw.similarity(currentSearchTerm, it)) + cos.similarity(currentSearchTerm, it) / 2
                 if (similarity != 0.0) ScoredItem(similarity, item) else null
             }

app/src/main/java/emu/skyline/adapter/GenericViewHolderBinder.kt

@@ -22,4 +22,9 @@ abstract class GenericViewHolderBinder {
     abstract fun getLayoutFactory() : GenericLayoutFactory
 
     abstract fun bind(holder : GenericViewHolder, position : Int)
+
+    /**
+     * Used for filtering
+     */
+    open fun key() : String = ""
 }

app/src/main/java/emu/skyline/data/AppItem.kt

@@ -13,7 +13,7 @@ import emu.skyline.loader.LoaderResult
 /**
  * This class is a wrapper around [AppEntry], it is used for passing around game metadata
  */
-class AppItem(val meta : AppEntry) : BaseItem() {
+class AppItem(private val meta : AppEntry) : DataItem {
     /**
      * The icon of the application
      */
@@ -56,5 +56,5 @@ class AppItem(val meta : AppEntry) : BaseItem() {
     /**
      * The name and author is used as the key
      */
-    override fun key() = meta.name + if (meta.author != null) " ${meta.author}" else ""
+    fun key() = meta.name + if (meta.author != null) " ${meta.author}" else ""
 }

app/src/main/java/emu/skyline/data/BaseItem.kt

@@ -1,16 +0,0 @@
-/*
- * SPDX-License-Identifier: MPL-2.0
- * Copyright © 2020 Skyline Team and Contributors (https://github.com/skyline-emu/)
- */
-
-package emu.skyline.data
-
-/**
- * This is an abstract class that all adapter item classes inherit from
- */
-abstract class BaseItem : BaseElement(ElementType.Item) {
-    /**
-     * This function returns a string used for searching
-     */
-    open fun key() : String = ""
-}

app/src/main/java/emu/skyline/data/DataItem.kt

@@ -5,4 +5,6 @@
 
 package emu.skyline.data
 
-class BaseHeader(val title : String) : BaseElement(ElementType.Header)
+import java.io.Serializable
+
+interface DataItem : Serializable

app/src/main/java/emu/skyline/data/HeaderItem.kt

@@ -5,11 +5,4 @@
 
 package emu.skyline.data
 
-import java.io.Serializable
+class HeaderItem(val title : String) : DataItem
-
-enum class ElementType {
-    Header,
-    Item
-}
-
-abstract class BaseElement(val elementType : ElementType) : Serializable

app/src/main/java/emu/skyline/input/ControllerActivity.kt

@@ -38,7 +38,7 @@ class ControllerActivity : AppCompatActivity() {
     private val adapter = GenericAdapter()
 
     /**
-     * This is a map between a button and it's corresponding [ControllerItem] in [adapter]
+     * This is a map between a button and it's corresponding [ControllerViewItem] in [adapter]
      */
     val buttonMap = mutableMapOf<ButtonId, ControllerViewItem>()
 

app/src/main/java/emu/skyline/input/HostEvent.kt

@@ -10,7 +10,7 @@ import android.view.MotionEvent
 import java.io.Serializable
 
 /**
- * This an abstract class for all host events that is inherited by all other event classes
+ * This a sealed class for all host events that is inherited by all other event classes
  *
  * @param descriptor The device descriptor of the device this event originates from
  */

app/src/main/java/emu/skyline/input/onscreen/OnScreenButton.kt

@@ -11,9 +11,11 @@ import android.graphics.Paint
 import android.graphics.Rect
 import androidx.core.content.ContextCompat
 import emu.skyline.input.ButtonId
-import kotlin.math.absoluteValue
 import kotlin.math.roundToInt
 
+/**
+ * Converts relative values, such as coordinates and boundaries, to their absolute counterparts, also handles layout modifications like scaling and custom positioning
+ */
 abstract class OnScreenButton(
         onScreenControllerView : OnScreenControllerView,
         val buttonId : ButtonId,
@@ -47,7 +49,11 @@ abstract class OnScreenButton(
     var height = 0
 
     protected val adjustedHeight get() = width / CONFIGURED_ASPECT_RATIO
-    protected val heightDiff get() = (height - adjustedHeight).absoluteValue
+
+    /**
+     * Buttons should be at bottom when device have large height than [adjustedHeight]
+     */
+    protected val heightDiff get() = (height - adjustedHeight).coerceAtLeast(0f)
 
     protected val itemWidth get() = width * relativeWidth
     private val itemHeight get() = adjustedHeight * relativeHeight
@@ -58,37 +64,23 @@ abstract class OnScreenButton(
     private val left get() = currentX - itemWidth / 2f
     private val top get() = currentY - itemHeight / 2f
 
-    protected val currentBounds
+    protected val currentBounds get() = Rect(left.roundToInt(), top.roundToInt(), (left + itemWidth).roundToInt(), (top + itemHeight).roundToInt())
-        get() = Rect(
-                left.roundToInt(),
-                top.roundToInt(),
-                (left + itemWidth).roundToInt(),
-                (top + itemHeight).roundToInt()
-        )
 
+    /**
+     * Keeps track of finger when there are multiple touches
+     */
     var touchPointerId = -1
 
     var isEditing = false
         private set
 
-    protected open fun renderCenteredText(
+    protected open fun renderCenteredText(canvas : Canvas, text : String, size : Float, x : Float, y : Float) {
-            canvas : Canvas,
-            text : String,
-            size : Float,
-            x : Float,
-            y : Float
-    ) {
         buttonSymbolPaint.apply {
             textSize = size
             textAlign = Paint.Align.LEFT
             getTextBounds(text, 0, text.length, textBoundsRect)
         }
-        canvas.drawText(
+        canvas.drawText(text, x - textBoundsRect.width() / 2f - textBoundsRect.left, y + textBoundsRect.height() / 2f - textBoundsRect.bottom, buttonSymbolPaint)
-                text,
-                x - textBoundsRect.width() / 2f - textBoundsRect.left,
-                y + textBoundsRect.height() / 2f - textBoundsRect.bottom,
-                buttonSymbolPaint
-        )
     }
 
     open fun render(canvas : Canvas) {

app/src/main/java/emu/skyline/input/onscreen/OnScreenConfiguration.kt

@@ -16,6 +16,9 @@ interface ControllerConfiguration {
     var relativeY : Float
 }
 
+/**
+ * Dummy implementation so layout editor is able to render [OnScreenControllerView] when [android.view.View.isInEditMode] is true
+ */
 class ControllerConfigurationDummy(defaultRelativeX : Float, defaultRelativeY : Float) : ControllerConfiguration {
     override var enabled = true
     override var globalScale = 1f

app/src/main/java/emu/skyline/input/onscreen/OnScreenControllerView.kt

@@ -25,12 +25,10 @@ import kotlin.math.roundToLong
 typealias OnButtonStateChangedListener = (buttonId : ButtonId, state : ButtonState) -> Unit
 typealias OnStickStateChangedListener = (buttonId : ButtonId, position : PointF) -> Unit
 
-class OnScreenControllerView @JvmOverloads constructor(
+/**
-        context : Context,
+ * Renders On-Screen Controls as a single view, handles touch inputs and button toggling
-        attrs : AttributeSet? = null,
+ */
-        defStyleAttr : Int = 0,
+class OnScreenControllerView @JvmOverloads constructor(context : Context, attrs : AttributeSet? = null, defStyleAttr : Int = 0, defStyleRes : Int = 0) : View(context, attrs, defStyleAttr, defStyleRes) {
-        defStyleRes : Int = 0
-) : View(context, attrs, defStyleAttr, defStyleRes) {
     private val controls = Controls(this)
     private var onButtonStateChangedListener : OnButtonStateChangedListener? = null
     private var onStickStateChangedListener : OnStickStateChangedListener? = null

app/src/main/java/emu/skyline/input/onscreen/OnScreenItemDefinitions.kt

@@ -34,10 +34,13 @@ open class CircularButton(
 ) {
     val radius get() = itemWidth / 2f
 
+    /**
+     * Checks if [x] and [y] are within circle
+     */
     override fun isTouched(x : Float, y : Float) : Boolean = PointF(currentX, currentY).minus(PointF(x, y)).length() <= radius
 
     override fun onFingerDown(x : Float, y : Float) {
-        drawable.alpha = (255 * 0.5f).roundToInt()
+        drawable.alpha = 125
     }
 
     override fun onFingerUp(x : Float, y : Float) {
@@ -81,19 +84,21 @@ class JoystickButton(
     override fun onFingerDown(x : Float, y : Float) {
         val relativeX = x / width
         val relativeY = (y - heightDiff) / adjustedHeight
-        if (!recenterSticks) {
+        if (recenterSticks) {
             this.relativeX = relativeX
             this.relativeY = relativeY
         }
         innerButton.relativeX = relativeX
         innerButton.relativeY = relativeY
 
+        // If first and second tap occur within 500 mills, then trigger stick press
         val currentTime = SystemClock.elapsedRealtime()
         initialTapPosition = PointF(x, y)
         val firstTapDiff = fingerUpTime - fingerDownTime
         val secondTapDiff = currentTime - fingerUpTime
         if (firstTapDiff in 0..500 && secondTapDiff in 0..500) {
             shortDoubleTapped = true
+            // Indicate stick being pressed with lower alpha value
             drawable.alpha = 50
         }
         fingerDownTime = currentTime
@@ -115,6 +120,7 @@ class JoystickButton(
         val outerToInner = finger.minus(position)
         val distance = outerToInner.length()
         if (distance > radius) {
+            // Limit distance to radius
             finger = position.add(outerToInner.multiply(1f / distance * radius))
         }
 
@@ -168,7 +174,7 @@ open class RectangularButton(
     override fun isTouched(x : Float, y : Float) = currentBounds.contains(x.roundToInt(), y.roundToInt())
 
     override fun onFingerDown(x : Float, y : Float) {
-        drawable.alpha = (255 * 0.5f).roundToInt()
+        drawable.alpha = 125
     }
 
     override fun onFingerUp(x : Float, y : Float) {

app/src/main/java/emu/skyline/loader/RomFile.kt

@@ -80,6 +80,7 @@ class AppEntry(var name : String, var author : String?, var icon : Bitmap?, var
         output.writeInt(loaderResult.value)
         output.writeBoolean(icon != null)
         icon?.let {
+            @Suppress("DEPRECATION")
             if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R)
                 it.compress(Bitmap.CompressFormat.WEBP_LOSSY, 100, output)
             else

app/src/main/java/emu/skyline/utils/Settings.kt

@@ -24,7 +24,7 @@ class Settings(context : Context) {
 
     var onScreenControl by sharedPreferences(context, false)
 
-    var onScreenControlRecenterSticks by sharedPreferences(context, false)
+    var onScreenControlRecenterSticks by sharedPreferences(context, true)
 
     var logCompact by sharedPreferences(context, false)
 

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

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+        xmlns:app="http://schemas.android.com/apk/res-auto"
         android:id="@+id/button_layout"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
@@ -39,7 +40,7 @@
                 android:contentDescription="@string/buttons"
                 android:outlineProvider="bounds"
                 android:src="@drawable/ic_button"
-                android:tint="?android:attr/textColorPrimary" />
+                app:tint="?android:attr/textColorPrimary" />
 
         <TextView
                 android:id="@+id/button_text"

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

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+        xmlns:app="http://schemas.android.com/apk/res-auto"
         android:id="@+id/stick_layout"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
@@ -51,7 +52,7 @@
                 android:contentDescription="@string/buttons"
                 android:outlineProvider="bounds"
                 android:src="@drawable/ic_button"
-                android:tint="?android:attr/textColorPrimary" />
+                app:tint="?android:attr/textColorPrimary" />
 
 
         <RelativeLayout
@@ -72,7 +73,7 @@
                     android:contentDescription="@string/buttons"
                     android:outlineProvider="bounds"
                     android:src="@drawable/ic_stick"
-                    android:tint="?android:attr/textColorPrimary" />
+                    app:tint="?android:attr/textColorPrimary" />
 
             <TextView
                     android:id="@+id/stick_name"