[SpinBoxSetting] Accelerate values addition/subtraction on button hold

src/android/app/src/main/java/org/yuzu/yuzu_emu/features/settings/ui/SettingsDialogFragment.kt

@@ -14,6 +14,9 @@ import android.text.TextWatcher
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
+import android.view.MotionEvent
+import android.os.Handler
+import android.os.Looper
 import androidx.appcompat.app.AlertDialog
 import androidx.core.view.isVisible
 import androidx.fragment.app.DialogFragment
@@ -197,6 +200,54 @@ class SettingsDialogFragment : DialogFragment(), DialogInterface.OnClickListener
                     updateValidity(newValue)
                 }
 
+                fun attachRepeat(button: View, delta: Int) {
+                    val handler = Handler(Looper.getMainLooper())
+                    var runnable: Runnable? = null
+                    val initialDelay = 400L
+                    val minDelay = 40L
+                    val accelerationFactor = 0.75f
+
+                    button.setOnTouchListener { v, event ->
+                        when (event.action) {
+                            MotionEvent.ACTION_DOWN -> {
+                                val current = spinboxBinding.editValue.text.toString().toIntOrNull() ?: currentValue
+                                val newValue = (current + delta)
+                                spinboxBinding.editValue.setText(newValue.toString())
+                                updateValidity(newValue)
+
+                                var delay = initialDelay
+                                runnable = object : Runnable {
+                                    override fun run() {
+                                        val curr = spinboxBinding.editValue.text.toString().toIntOrNull() ?: currentValue
+                                        val next = curr + delta
+                                        spinboxBinding.editValue.setText(next.toString())
+                                        updateValidity(next)
+                                        // accelerate
+                                        delay = (delay * accelerationFactor).toLong().coerceAtLeast(minDelay)
+                                        handler.postDelayed(this, delay)
+                                    }
+                                }
+                                handler.postDelayed(runnable!!, initialDelay)
+                                true
+                            }
+
+                            MotionEvent.ACTION_UP, MotionEvent.ACTION_CANCEL -> {
+                                if (runnable != null) {
+                                    handler.removeCallbacks(runnable!!)
+                                    runnable = null
+                                }
+                                v.performClick()
+                                true
+                            }
+
+                            else -> false
+                        }
+                    }
+                }
+
+                attachRepeat(spinboxBinding.buttonDecrement, -1)
+                attachRepeat(spinboxBinding.buttonIncrement, 1)
+
                 spinboxBinding.editValue.addTextChangedListener(object : TextWatcher {
                     override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {}
                     override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {}