android: Convert EmulationFragment to Kotlin

2 files changed, 348 insertions, 375 deletions

diff --git a/src/android/app/src/main/java/org/yuzu/yuzu_emu/fragments/EmulationFragment.java b/src/android/app/src/main/java/org/yuzu/yuzu_emu/fragments/EmulationFragment.java
deleted file mode 100644
index 2a2b0f68b..000000000
--- a/src/android/app/src/main/java/org/yuzu/yuzu_emu/fragments/EmulationFragment.java
+++ /dev/null
@@ -1,375 +0,0 @@
-package org.yuzu.yuzu_emu.fragments;
-
-import android.content.Context;
-import android.content.IntentFilter;
-import android.content.SharedPreferences;
-import android.graphics.Color;
-import android.os.Bundle;
-import android.os.Handler;
-import android.preference.PreferenceManager;
-import android.view.Choreographer;
-import android.view.LayoutInflater;
-import android.view.Surface;
-import android.view.SurfaceHolder;
-import android.view.SurfaceView;
-import android.view.View;
-import android.view.ViewGroup;
-import android.widget.Button;
-import android.widget.TextView;
-import android.widget.Toast;
-
-import androidx.annotation.NonNull;
-import androidx.fragment.app.Fragment;
-import androidx.localbroadcastmanager.content.LocalBroadcastManager;
-
-import org.yuzu.yuzu_emu.NativeLibrary;
-import org.yuzu.yuzu_emu.R;
-import org.yuzu.yuzu_emu.activities.EmulationActivity;
-import org.yuzu.yuzu_emu.overlay.InputOverlay;
-import org.yuzu.yuzu_emu.utils.DirectoryInitialization;
-import org.yuzu.yuzu_emu.utils.DirectoryInitialization.DirectoryInitializationState;
-import org.yuzu.yuzu_emu.utils.DirectoryStateReceiver;
-import org.yuzu.yuzu_emu.utils.Log;
-
-public final class EmulationFragment extends Fragment implements SurfaceHolder.Callback, Choreographer.FrameCallback {
-    private static final String KEY_GAMEPATH = "gamepath";
-
-    private static final Handler perfStatsUpdateHandler = new Handler();
-
-    private SharedPreferences mPreferences;
-
-    private InputOverlay mInputOverlay;
-
-    private EmulationState mEmulationState;
-
-    private DirectoryStateReceiver directoryStateReceiver;
-
-    private EmulationActivity activity;
-
-    private TextView mPerfStats;
-
-    private Runnable perfStatsUpdater;
-
-    public static EmulationFragment newInstance(String gamePath) {
-        Bundle args = new Bundle();
-        args.putString(KEY_GAMEPATH, gamePath);
-
-        EmulationFragment fragment = new EmulationFragment();
-        fragment.setArguments(args);
-        return fragment;
-    }
-
-    @Override
-    public void onAttach(@NonNull Context context) {
-        super.onAttach(context);
-
-        if (context instanceof EmulationActivity) {
-            activity = (EmulationActivity) context;
-            NativeLibrary.setEmulationActivity((EmulationActivity) context);
-        } else {
-            throw new IllegalStateException("EmulationFragment must have EmulationActivity parent");
-        }
-    }
-
-    /**
-     * Initialize anything that doesn't depend on the layout / views in here.
-     */
-    @Override
-    public void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
-
-        // So this fragment doesn't restart on configuration changes; i.e. rotation.
-        setRetainInstance(true);
-
-        mPreferences = PreferenceManager.getDefaultSharedPreferences(getActivity());
-
-        String gamePath = getArguments().getString(KEY_GAMEPATH);
-        mEmulationState = new EmulationState(gamePath);
-    }
-
-    /**
-     * Initialize the UI and start emulation in here.
-     */
-    @Override
-    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
-        View contents = inflater.inflate(R.layout.fragment_emulation, container, false);
-
-        SurfaceView surfaceView = contents.findViewById(R.id.surface_emulation);
-        surfaceView.getHolder().addCallback(this);
-
-        mInputOverlay = contents.findViewById(R.id.surface_input_overlay);
-        mPerfStats = contents.findViewById(R.id.show_fps_text);
-        mPerfStats.setTextColor(Color.YELLOW);
-
-        Button doneButton = contents.findViewById(R.id.done_control_config);
-        if (doneButton != null) {
-            doneButton.setOnClickListener(v -> stopConfiguringControls());
-        }
-
-        // Setup overlay.
-        resetInputOverlay();
-        updateShowFpsOverlay();
-
-        // The new Surface created here will get passed to the native code via onSurfaceChanged.
-        return contents;
-    }
-
-    @Override
-    public void onResume() {
-        super.onResume();
-        Choreographer.getInstance().postFrameCallback(this);
-        if (DirectoryInitialization.areDirectoriesReady()) {
-            mEmulationState.run(activity.isActivityRecreated());
-        } else {
-            setupDirectoriesThenStartEmulation();
-        }
-    }
-
-    @Override
-    public void onPause() {
-        if (directoryStateReceiver != null) {
-            LocalBroadcastManager.getInstance(getActivity()).unregisterReceiver(directoryStateReceiver);
-            directoryStateReceiver = null;
-        }
-
-        if (mEmulationState.isRunning()) {
-            mEmulationState.pause();
-        }
-
-        Choreographer.getInstance().removeFrameCallback(this);
-        super.onPause();
-    }
-
-    @Override
-    public void onDetach() {
-        NativeLibrary.clearEmulationActivity();
-        super.onDetach();
-    }
-
-    private void setupDirectoriesThenStartEmulation() {
-        IntentFilter statusIntentFilter = new IntentFilter(
-                DirectoryInitialization.BROADCAST_ACTION);
-
-        directoryStateReceiver =
-                new DirectoryStateReceiver(directoryInitializationState ->
-                {
-                    if (directoryInitializationState ==
-                            DirectoryInitializationState.YUZU_DIRECTORIES_INITIALIZED) {
-                        mEmulationState.run(activity.isActivityRecreated());
-                    } else if (directoryInitializationState ==
-                            DirectoryInitializationState.CANT_FIND_EXTERNAL_STORAGE) {
-                        Toast.makeText(getContext(), R.string.external_storage_not_mounted,
-                                Toast.LENGTH_SHORT)
-                                .show();
-                    }
-                });
-
-        // Registers the DirectoryStateReceiver and its intent filters
-        LocalBroadcastManager.getInstance(getActivity()).registerReceiver(
-                directoryStateReceiver,
-                statusIntentFilter);
-        DirectoryInitialization.start(getActivity());
-    }
-
-    public void refreshInputOverlay() {
-        mInputOverlay.refreshControls();
-    }
-
-    public void resetInputOverlay() {
-        // Reset button scale
-        SharedPreferences.Editor editor = mPreferences.edit();
-        editor.putInt("controlScale", 50);
-        editor.apply();
-
-        mInputOverlay.resetButtonPlacement();
-    }
-
-    public void updateShowFpsOverlay() {
-        if (true) {
-            final int SYSTEM_FPS = 0;
-            final int FPS = 1;
-            final int FRAMETIME = 2;
-            final int SPEED = 3;
-
-            perfStatsUpdater = () ->
-            {
-                final double[] perfStats = NativeLibrary.GetPerfStats();
-                if (perfStats[FPS] > 0) {
-                    mPerfStats.setText(String.format("FPS: %.1f", perfStats[FPS]));
-                }
-
-                perfStatsUpdateHandler.postDelayed(perfStatsUpdater, 100);
-            };
-            perfStatsUpdateHandler.post(perfStatsUpdater);
-
-            mPerfStats.setVisibility(View.VISIBLE);
-        } else {
-            if (perfStatsUpdater != null) {
-                perfStatsUpdateHandler.removeCallbacks(perfStatsUpdater);
-            }
-
-            mPerfStats.setVisibility(View.GONE);
-        }
-    }
-
-    @Override
-    public void surfaceCreated(SurfaceHolder holder) {
-        // We purposely don't do anything here.
-        // All work is done in surfaceChanged, which we are guaranteed to get even for surface creation.
-    }
-
-    @Override
-    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
-        Log.debug("[EmulationFragment] Surface changed. Resolution: " + width + "x" + height);
-        mEmulationState.newSurface(holder.getSurface());
-    }
-
-    @Override
-    public void surfaceDestroyed(SurfaceHolder holder) {
-        mEmulationState.clearSurface();
-    }
-
-    @Override
-    public void doFrame(long frameTimeNanos) {
-        Choreographer.getInstance().postFrameCallback(this);
-        NativeLibrary.DoFrame();
-    }
-
-    public void stopEmulation() {
-        mEmulationState.stop();
-    }
-
-    public void startConfiguringControls() {
-        getView().findViewById(R.id.done_control_config).setVisibility(View.VISIBLE);
-        mInputOverlay.setIsInEditMode(true);
-    }
-
-    public void stopConfiguringControls() {
-        getView().findViewById(R.id.done_control_config).setVisibility(View.GONE);
-        mInputOverlay.setIsInEditMode(false);
-    }
-
-    public boolean isConfiguringControls() {
-        return mInputOverlay.isInEditMode();
-    }
-
-    private static class EmulationState {
-        private final String mGamePath;
-        private State state;
-        private Surface mSurface;
-        private boolean mRunWhenSurfaceIsValid;
-
-        EmulationState(String gamePath) {
-            mGamePath = gamePath;
-            // Starting state is stopped.
-            state = State.STOPPED;
-        }
-
-        public synchronized boolean isStopped() {
-            return state == State.STOPPED;
-        }
-
-        // Getters for the current state
-
-        public synchronized boolean isPaused() {
-            return state == State.PAUSED;
-        }
-
-        public synchronized boolean isRunning() {
-            return state == State.RUNNING;
-        }
-
-        public synchronized void stop() {
-            if (state != State.STOPPED) {
-                Log.debug("[EmulationFragment] Stopping emulation.");
-                state = State.STOPPED;
-                NativeLibrary.StopEmulation();
-            } else {
-                Log.warning("[EmulationFragment] Stop called while already stopped.");
-            }
-        }
-
-        // State changing methods
-
-        public synchronized void pause() {
-            if (state != State.PAUSED) {
-                state = State.PAUSED;
-                Log.debug("[EmulationFragment] Pausing emulation.");
-
-                // Release the surface before pausing, since emulation has to be running for that.
-                NativeLibrary.SurfaceDestroyed();
-                NativeLibrary.PauseEmulation();
-            } else {
-                Log.warning("[EmulationFragment] Pause called while already paused.");
-            }
-        }
-
-        public synchronized void run(boolean isActivityRecreated) {
-            if (isActivityRecreated) {
-                if (NativeLibrary.IsRunning()) {
-                    state = State.PAUSED;
-                }
-            } else {
-                Log.debug("[EmulationFragment] activity resumed or fresh start");
-            }
-
-            // If the surface is set, run now. Otherwise, wait for it to get set.
-            if (mSurface != null) {
-                runWithValidSurface();
-            } else {
-                mRunWhenSurfaceIsValid = true;
-            }
-        }
-
-        // Surface callbacks
-        public synchronized void newSurface(Surface surface) {
-            mSurface = surface;
-            if (mRunWhenSurfaceIsValid) {
-                runWithValidSurface();
-            }
-        }
-
-        public synchronized void clearSurface() {
-            if (mSurface == null) {
-                Log.warning("[EmulationFragment] clearSurface called, but surface already null.");
-            } else {
-                mSurface = null;
-                Log.debug("[EmulationFragment] Surface destroyed.");
-
-                if (state == State.RUNNING) {
-                    NativeLibrary.SurfaceDestroyed();
-                    state = State.PAUSED;
-                } else if (state == State.PAUSED) {
-                    Log.warning("[EmulationFragment] Surface cleared while emulation paused.");
-                } else {
-                    Log.warning("[EmulationFragment] Surface cleared while emulation stopped.");
-                }
-            }
-        }
-
-        private void runWithValidSurface() {
-            mRunWhenSurfaceIsValid = false;
-            if (state == State.STOPPED) {
-                NativeLibrary.SurfaceChanged(mSurface);
-                Thread mEmulationThread = new Thread(() ->
-                {
-                    Log.debug("[EmulationFragment] Starting emulation thread.");
-                    NativeLibrary.Run(mGamePath);
-                }, "NativeEmulation");
-                mEmulationThread.start();
-
-            } else if (state == State.PAUSED) {
-                Log.debug("[EmulationFragment] Resuming emulation.");
-                NativeLibrary.SurfaceChanged(mSurface);
-                NativeLibrary.UnPauseEmulation();
-            } else {
-                Log.debug("[EmulationFragment] Bug, run called while already running.");
-            }
-            state = State.RUNNING;
-        }
-
-        private enum State {
-            STOPPED, RUNNING, PAUSED
-        }
-    }
-}
diff --git a/src/android/app/src/main/java/org/yuzu/yuzu_emu/fragments/EmulationFragment.kt b/src/android/app/src/main/java/org/yuzu/yuzu_emu/fragments/EmulationFragment.kt
new file mode 100644
index 000000000..77964b88c
--- /dev/null
+++ b/src/android/app/src/main/java/org/yuzu/yuzu_emu/fragments/EmulationFragment.kt
@@ -0,0 +1,348 @@
+package org.yuzu.yuzu_emu.fragments
+
+import android.content.Context
+import android.content.IntentFilter
+import android.content.SharedPreferences
+import android.graphics.Color
+import android.os.Bundle
+import android.os.Handler
+import android.view.*
+import android.widget.Button
+import android.widget.TextView
+import android.widget.Toast
+import androidx.fragment.app.Fragment
+import androidx.localbroadcastmanager.content.LocalBroadcastManager
+import androidx.preference.PreferenceManager
+import org.yuzu.yuzu_emu.NativeLibrary
+import org.yuzu.yuzu_emu.R
+import org.yuzu.yuzu_emu.YuzuApplication
+import org.yuzu.yuzu_emu.activities.EmulationActivity
+import org.yuzu.yuzu_emu.features.settings.model.Settings
+import org.yuzu.yuzu_emu.overlay.InputOverlay
+import org.yuzu.yuzu_emu.utils.DirectoryInitialization
+import org.yuzu.yuzu_emu.utils.DirectoryInitialization.DirectoryInitializationState
+import org.yuzu.yuzu_emu.utils.DirectoryStateReceiver
+import org.yuzu.yuzu_emu.utils.Log
+
+class EmulationFragment : Fragment(), SurfaceHolder.Callback, Choreographer.FrameCallback {
+    private lateinit var preferences: SharedPreferences
+    private var inputOverlay: InputOverlay? = null
+    private lateinit var emulationState: EmulationState
+    private var directoryStateReceiver: DirectoryStateReceiver? = null
+    private var emulationActivity: EmulationActivity? = null
+    private lateinit var perfStats: TextView
+    private var perfStatsUpdater: (() -> Unit)? = null
+
+    override fun onAttach(context: Context) {
+        super.onAttach(context)
+        if (context is EmulationActivity) {
+            emulationActivity = context
+            NativeLibrary.setEmulationActivity(context)
+        } else {
+            throw IllegalStateException("EmulationFragment must have EmulationActivity parent")
+        }
+    }
+
+    /**
+     * Initialize anything that doesn't depend on the layout / views in here.
+     */
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        // So this fragment doesn't restart on configuration changes; i.e. rotation.
+        retainInstance = true
+        preferences = PreferenceManager.getDefaultSharedPreferences(YuzuApplication.appContext)
+        val gamePath = requireArguments().getString(KEY_GAMEPATH)
+        emulationState = EmulationState(gamePath)
+    }
+
+    /**
+     * Initialize the UI and start emulation in here.
+     */
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        val contents = inflater.inflate(R.layout.fragment_emulation, container, false)
+        val surfaceView = contents.findViewById<SurfaceView>(R.id.surface_emulation)
+        surfaceView.holder.addCallback(this)
+        inputOverlay = contents.findViewById(R.id.surface_input_overlay)
+        perfStats = contents.findViewById(R.id.show_fps_text)
+        perfStats.setTextColor(Color.YELLOW)
+        val doneButton = contents.findViewById<Button>(R.id.done_control_config)
+        doneButton?.setOnClickListener { stopConfiguringControls() }
+
+        // Setup overlay.
+        resetInputOverlay()
+        updateShowFpsOverlay()
+
+        // The new Surface created here will get passed to the native code via onSurfaceChanged.
+        return contents
+    }
+
+    override fun onResume() {
+        super.onResume()
+        Choreographer.getInstance().postFrameCallback(this)
+        if (DirectoryInitialization.areDirectoriesReady()) {
+            emulationState.run(emulationActivity!!.isActivityRecreated)
+        } else {
+            setupDirectoriesThenStartEmulation()
+        }
+    }
+
+    override fun onPause() {
+        if (directoryStateReceiver != null) {
+            LocalBroadcastManager.getInstance(requireActivity()).unregisterReceiver(
+                directoryStateReceiver!!
+            )
+            directoryStateReceiver = null
+        }
+        if (emulationState.isRunning) {
+            emulationState.pause()
+        }
+        Choreographer.getInstance().removeFrameCallback(this)
+        super.onPause()
+    }
+
+    override fun onDetach() {
+        NativeLibrary.clearEmulationActivity()
+        super.onDetach()
+    }
+
+    private fun setupDirectoriesThenStartEmulation() {
+        val statusIntentFilter = IntentFilter(
+            DirectoryInitialization.BROADCAST_ACTION
+        )
+        directoryStateReceiver =
+            DirectoryStateReceiver { directoryInitializationState: DirectoryInitializationState ->
+                if (directoryInitializationState ==
+                    DirectoryInitializationState.YUZU_DIRECTORIES_INITIALIZED
+                ) {
+                    emulationState.run(emulationActivity!!.isActivityRecreated)
+                } else if (directoryInitializationState ==
+                    DirectoryInitializationState.CANT_FIND_EXTERNAL_STORAGE
+                ) {
+                    Toast.makeText(
+                        context,
+                        R.string.external_storage_not_mounted,
+                        Toast.LENGTH_SHORT
+                    )
+                        .show()
+                }
+            }
+
+        // Registers the DirectoryStateReceiver and its intent filters
+        LocalBroadcastManager.getInstance(requireActivity()).registerReceiver(
+            directoryStateReceiver!!,
+            statusIntentFilter
+        )
+        DirectoryInitialization.start(requireContext())
+    }
+
+    fun refreshInputOverlay() {
+        inputOverlay!!.refreshControls()
+    }
+
+    fun resetInputOverlay() {
+        // Reset button scale
+        preferences.edit()
+            .putInt(Settings.PREF_CONTROL_SCALE, 50)
+            .apply()
+        inputOverlay!!.resetButtonPlacement()
+    }
+
+    private fun updateShowFpsOverlay() {
+        // TODO: Create a setting so that this actually works...
+        if (true) {
+            val SYSTEM_FPS = 0
+            val FPS = 1
+            val FRAMETIME = 2
+            val SPEED = 3
+            perfStatsUpdater = {
+                val perfStats = NativeLibrary.GetPerfStats()
+                if (perfStats[FPS] > 0) {
+                    this.perfStats.text = String.format("FPS: %.1f", perfStats[FPS])
+                }
+                perfStatsUpdateHandler.postDelayed(perfStatsUpdater!!, 100)
+            }
+            perfStatsUpdateHandler.post(perfStatsUpdater!!)
+            perfStats.visibility = View.VISIBLE
+        } else {
+            if (perfStatsUpdater != null) {
+                perfStatsUpdateHandler.removeCallbacks(perfStatsUpdater!!)
+            }
+            perfStats.visibility = View.GONE
+        }
+    }
+
+    override fun surfaceCreated(holder: SurfaceHolder) {
+        // We purposely don't do anything here.
+        // All work is done in surfaceChanged, which we are guaranteed to get even for surface creation.
+    }
+
+    override fun surfaceChanged(holder: SurfaceHolder, format: Int, width: Int, height: Int) {
+        Log.debug("[EmulationFragment] Surface changed. Resolution: " + width + "x" + height)
+        emulationState.newSurface(holder.surface)
+    }
+
+    override fun surfaceDestroyed(holder: SurfaceHolder) {
+        emulationState.clearSurface()
+    }
+
+    override fun doFrame(frameTimeNanos: Long) {
+        Choreographer.getInstance().postFrameCallback(this)
+        NativeLibrary.DoFrame()
+    }
+
+    fun stopEmulation() {
+        emulationState.stop()
+    }
+
+    fun startConfiguringControls() {
+        requireView().findViewById<View>(R.id.done_control_config).visibility =
+            View.VISIBLE
+        inputOverlay!!.setIsInEditMode(true)
+    }
+
+    fun stopConfiguringControls() {
+        requireView().findViewById<View>(R.id.done_control_config).visibility = View.GONE
+        inputOverlay!!.setIsInEditMode(false)
+    }
+
+    val isConfiguringControls: Boolean
+        get() = inputOverlay!!.isInEditMode
+
+    private class EmulationState(private val mGamePath: String?) {
+        private var state: State
+        private var surface: Surface? = null
+        private var runWhenSurfaceIsValid = false
+
+        init {
+            // Starting state is stopped.
+            state = State.STOPPED
+        }
+
+        @get:Synchronized
+        val isStopped: Boolean
+            get() = state == State.STOPPED
+
+        // Getters for the current state
+        @get:Synchronized
+        val isPaused: Boolean
+            get() = state == State.PAUSED
+
+        @get:Synchronized
+        val isRunning: Boolean
+            get() = state == State.RUNNING
+
+        @Synchronized
+        fun stop() {
+            if (state != State.STOPPED) {
+                Log.debug("[EmulationFragment] Stopping emulation.")
+                state = State.STOPPED
+                NativeLibrary.StopEmulation()
+            } else {
+                Log.warning("[EmulationFragment] Stop called while already stopped.")
+            }
+        }
+
+        // State changing methods
+        @Synchronized
+        fun pause() {
+            if (state != State.PAUSED) {
+                state = State.PAUSED
+                Log.debug("[EmulationFragment] Pausing emulation.")
+
+                // Release the surface before pausing, since emulation has to be running for that.
+                NativeLibrary.SurfaceDestroyed()
+                NativeLibrary.PauseEmulation()
+            } else {
+                Log.warning("[EmulationFragment] Pause called while already paused.")
+            }
+        }
+
+        @Synchronized
+        fun run(isActivityRecreated: Boolean) {
+            if (isActivityRecreated) {
+                if (NativeLibrary.IsRunning()) {
+                    state = State.PAUSED
+                }
+            } else {
+                Log.debug("[EmulationFragment] activity resumed or fresh start")
+            }
+
+            // If the surface is set, run now. Otherwise, wait for it to get set.
+            if (surface != null) {
+                runWithValidSurface()
+            } else {
+                runWhenSurfaceIsValid = true
+            }
+        }
+
+        // Surface callbacks
+        @Synchronized
+        fun newSurface(surface: Surface?) {
+            this.surface = surface
+            if (runWhenSurfaceIsValid) {
+                runWithValidSurface()
+            }
+        }
+
+        @Synchronized
+        fun clearSurface() {
+            if (surface == null) {
+                Log.warning("[EmulationFragment] clearSurface called, but surface already null.")
+            } else {
+                surface = null
+                Log.debug("[EmulationFragment] Surface destroyed.")
+                when (state) {
+                    State.RUNNING -> {
+                        NativeLibrary.SurfaceDestroyed()
+                        state = State.PAUSED
+                    }
+                    State.PAUSED -> Log.warning("[EmulationFragment] Surface cleared while emulation paused.")
+                    else -> Log.warning("[EmulationFragment] Surface cleared while emulation stopped.")
+                }
+            }
+        }
+
+        private fun runWithValidSurface() {
+            runWhenSurfaceIsValid = false
+            when (state) {
+                State.STOPPED -> {
+                    NativeLibrary.SurfaceChanged(surface)
+                    val mEmulationThread = Thread({
+                        Log.debug("[EmulationFragment] Starting emulation thread.")
+                        NativeLibrary.Run(mGamePath)
+                    }, "NativeEmulation")
+                    mEmulationThread.start()
+                }
+                State.PAUSED -> {
+                    Log.debug("[EmulationFragment] Resuming emulation.")
+                    NativeLibrary.SurfaceChanged(surface)
+                    NativeLibrary.UnPauseEmulation()
+                }
+                else -> Log.debug("[EmulationFragment] Bug, run called while already running.")
+            }
+            state = State.RUNNING
+        }
+
+        private enum class State {
+            STOPPED, RUNNING, PAUSED
+        }
+    }
+
+    companion object {
+        private const val KEY_GAMEPATH = "gamepath"
+        private val perfStatsUpdateHandler = Handler()
+
+        fun newInstance(gamePath: String?): EmulationFragment {
+            val args = Bundle()
+            args.putString(KEY_GAMEPATH, gamePath)
+            val fragment = EmulationFragment()
+            fragment.arguments = args
+            return fragment
+        }
+    }
+}