Android: Hotkey Enable Button (#1464)

src/android/app/src/main/java/org/citra/citra_emu/activities/EmulationActivity.kt

@@ -267,36 +267,28 @@ class EmulationActivity : AppCompatActivity() {
             return super.dispatchKeyEvent(event)
         }
 
-        val button =
+        when (event.action) {
-            preferences.getInt(InputBindingSetting.getInputButtonKey(event.keyCode), event.keyCode)
-        val action: Int = when (event.action) {
             KeyEvent.ACTION_DOWN -> {
-                hotkeyUtility.handleHotkey(button)
-
                 // On some devices, the back gesture / button press is not intercepted by androidx
                 // and fails to open the emulation menu. So we're stuck running deprecated code to
                 // cover for either a fault on androidx's side or in OEM skins (MIUI at least)
+
                 if (event.keyCode == KeyEvent.KEYCODE_BACK) {
                     // If the hotkey is pressed, we don't want to open the drawer
-                    if (!hotkeyUtility.HotkeyIsPressed) {
+                    if (!hotkeyUtility.hotkeyIsPressed) {
                         onBackPressed()
+                        return true
                     }
                 }
-
+                return hotkeyUtility.handleKeyPress(event)
-                // Normal key events.
-                NativeLibrary.ButtonState.PRESSED
             }
-
             KeyEvent.ACTION_UP -> {
-                hotkeyUtility.HotkeyIsPressed = false
+                return hotkeyUtility.handleKeyRelease(event)
-                NativeLibrary.ButtonState.RELEASED
+            }
+            else -> {
+                return false;
             }
-            else -> return false
         }
-        val input = event.device
-            ?: // Controller was disconnected
-            return false
-        return NativeLibrary.onGamePadEvent(input.descriptor, button, action)
     }
 
     private fun onAmiiboSelected(selectedFile: String) {

src/android/app/src/main/java/org/citra/citra_emu/features/hotkeys/Hotkey.kt

@@ -11,5 +11,6 @@ enum class Hotkey(val button: Int) {
     PAUSE_OR_RESUME(10004),
     QUICKSAVE(10005),
     QUICKLOAD(10006),
-    TURBO_LIMIT(10007);
+    TURBO_LIMIT(10007),
+    ENABLE(10008);
 }

src/android/app/src/main/java/org/citra/citra_emu/features/hotkeys/HotkeyUtility.kt

@@ -5,50 +5,140 @@
 package org.citra.citra_emu.features.hotkeys
 
 import android.content.Context
+import android.view.KeyEvent
 import android.widget.Toast
+import androidx.preference.PreferenceManager
+import org.citra.citra_emu.CitraApplication
 import org.citra.citra_emu.NativeLibrary
 import org.citra.citra_emu.R
 import org.citra.citra_emu.utils.EmulationLifecycleUtil
 import org.citra.citra_emu.utils.TurboHelper
 import org.citra.citra_emu.display.ScreenAdjustmentUtil
+import org.citra.citra_emu.features.settings.model.view.InputBindingSetting
+import org.citra.citra_emu.features.settings.model.Settings
 
 class HotkeyUtility(
     private val screenAdjustmentUtil: ScreenAdjustmentUtil,
-    private val context: Context) {
+    private val context: Context
+) {
 
     private val hotkeyButtons = Hotkey.entries.map { it.button }
-    var HotkeyIsPressed = false
+    private var hotkeyIsEnabled = false
+    var hotkeyIsPressed = false
+    private val currentlyPressedButtons = mutableSetOf<Int>()
+
+    fun handleKeyPress(keyEvent: KeyEvent): Boolean {
+        var handled = false
+        val buttonSet = InputBindingSetting.getButtonSet(keyEvent)
+        val enableButton =
+            PreferenceManager.getDefaultSharedPreferences(CitraApplication.appContext)
+                .getString(Settings.HOTKEY_ENABLE, "")
+        val thisKeyIsEnableButton = buttonSet.contains(Hotkey.ENABLE.button)
+        val thisKeyIsHotkey =
+            !thisKeyIsEnableButton && Hotkey.entries.any { buttonSet.contains(it.button) }
+        hotkeyIsEnabled = hotkeyIsEnabled || enableButton == "" || thisKeyIsEnableButton
+
+        // Now process all internal buttons associated with this keypress
+        for (button in buttonSet) {
+            currentlyPressedButtons.add(button)
+            //option 1 - this is the enable command, which was already handled
+            if (button == Hotkey.ENABLE.button) {
+                handled = true
+            }
+            // option 2 - this is a different hotkey command
+            else if (hotkeyButtons.contains(button)) {
+                if (hotkeyIsEnabled) {
+                    handled = handleHotkey(button) || handled
+                }
+            }
+            // option 3 - this is a normal key
+            else {
+                // if this key press is ALSO associated with a hotkey that will process, skip
+                // the normal key event.
+                if (!thisKeyIsHotkey || !hotkeyIsEnabled) {
+                    handled = NativeLibrary.onGamePadEvent(
+                        keyEvent.device.descriptor,
+                        button,
+                        NativeLibrary.ButtonState.PRESSED
+                    ) || handled
+                }
+            }
+        }
+        return handled
+    }
+
+    fun handleKeyRelease(keyEvent: KeyEvent): Boolean {
+        var handled = false
+        val buttonSet = InputBindingSetting.getButtonSet(keyEvent)
+        val thisKeyIsEnableButton = buttonSet.contains(Hotkey.ENABLE.button)
+        val thisKeyIsHotkey =
+            !thisKeyIsEnableButton && Hotkey.entries.any { buttonSet.contains(it.button) }
+        if (thisKeyIsEnableButton) {
+            handled = true; hotkeyIsEnabled = false
+        }
+
+        for (button in buttonSet) {
+            // this is a hotkey button
+            if (hotkeyButtons.contains(button)) {
+                currentlyPressedButtons.remove(button)
+                if (!currentlyPressedButtons.any { hotkeyButtons.contains(it) }) {
+                    // all hotkeys are no longer pressed
+                    hotkeyIsPressed = false
+                }
+            } else {
+                // if this key ALSO sends a hotkey command that we already/will handle,
+                // or if we did not register the press of this button, e.g. if this key
+                // was also a hotkey pressed after enable, but released after enable button release, then
+                // skip the normal key event
+                if ((!thisKeyIsHotkey || !hotkeyIsEnabled) && currentlyPressedButtons.contains(
+                        button
+                    )
+                ) {
+                    handled = NativeLibrary.onGamePadEvent(
+                        keyEvent.device.descriptor,
+                        button,
+                        NativeLibrary.ButtonState.RELEASED
+                    ) || handled
+                    currentlyPressedButtons.remove(button)
+                }
+            }
+        }
+        return handled
+    }
 
     fun handleHotkey(bindedButton: Int): Boolean {
-        if(hotkeyButtons.contains(bindedButton)) {
+        when (bindedButton) {
-            when (bindedButton) {
+            Hotkey.SWAP_SCREEN.button -> screenAdjustmentUtil.swapScreen()
-                Hotkey.SWAP_SCREEN.button -> screenAdjustmentUtil.swapScreen()
+            Hotkey.CYCLE_LAYOUT.button -> screenAdjustmentUtil.cycleLayouts()
-                Hotkey.CYCLE_LAYOUT.button -> screenAdjustmentUtil.cycleLayouts()
+            Hotkey.CLOSE_GAME.button -> EmulationLifecycleUtil.closeGame()
-                Hotkey.CLOSE_GAME.button -> EmulationLifecycleUtil.closeGame()
+            Hotkey.PAUSE_OR_RESUME.button -> EmulationLifecycleUtil.pauseOrResume()
-                Hotkey.PAUSE_OR_RESUME.button -> EmulationLifecycleUtil.pauseOrResume()
+            Hotkey.TURBO_LIMIT.button -> TurboHelper.toggleTurbo(true)
-                Hotkey.TURBO_LIMIT.button -> TurboHelper.toggleTurbo(true)
+            Hotkey.QUICKSAVE.button -> {
-                Hotkey.QUICKSAVE.button -> {
+                NativeLibrary.saveState(NativeLibrary.QUICKSAVE_SLOT)
-                    NativeLibrary.saveState(NativeLibrary.QUICKSAVE_SLOT)
+                Toast.makeText(
-                    Toast.makeText(context,
+                    context,
-                        context.getString(R.string.saving),
+                    context.getString(R.string.saving),
-                        Toast.LENGTH_SHORT).show()
+                    Toast.LENGTH_SHORT
-                }
+                ).show()
-                Hotkey.QUICKLOAD.button -> {
-                    val wasLoaded = NativeLibrary.loadStateIfAvailable(NativeLibrary.QUICKSAVE_SLOT)
-                    val stringRes = if(wasLoaded) {
-                        R.string.loading
-                    } else {
-                        R.string.quickload_not_found
-                    }
-                    Toast.makeText(context,
-                        context.getString(stringRes),
-                        Toast.LENGTH_SHORT).show()
-                }
-                else -> {}
             }
-            HotkeyIsPressed = true
+
-            return true
+            Hotkey.QUICKLOAD.button -> {
+                val wasLoaded = NativeLibrary.loadStateIfAvailable(NativeLibrary.QUICKSAVE_SLOT)
+                val stringRes = if (wasLoaded) {
+                    R.string.loading
+                } else {
+                    R.string.quickload_not_found
+                }
+                Toast.makeText(
+                    context,
+                    context.getString(stringRes),
+                    Toast.LENGTH_SHORT
+                ).show()
+            }
+
+            else -> {}
         }
-        return false
+        hotkeyIsPressed = true
+        return true
     }
 }

src/android/app/src/main/java/org/citra/citra_emu/features/settings/model/Settings.kt

@@ -135,6 +135,7 @@ class Settings {
         const val KEY_CSTICK_AXIS_HORIZONTAL = "cstick_axis_horizontal"
         const val KEY_DPAD_AXIS_VERTICAL = "dpad_axis_vertical"
         const val KEY_DPAD_AXIS_HORIZONTAL = "dpad_axis_horizontal"
+        const val HOTKEY_ENABLE = "hotkey_enable"
         const val HOTKEY_SCREEN_SWAP = "hotkey_screen_swap"
         const val HOTKEY_CYCLE_LAYOUT = "hotkey_toggle_layout"
         const val HOTKEY_CLOSE_GAME = "hotkey_close_game"
@@ -202,6 +203,7 @@ class Settings {
             R.string.button_zr
         )
         val hotKeys = listOf(
+            HOTKEY_ENABLE,
             HOTKEY_SCREEN_SWAP,
             HOTKEY_CYCLE_LAYOUT,
             HOTKEY_CLOSE_GAME,
@@ -211,6 +213,7 @@ class Settings {
             HOTKEY_TURBO_LIMIT
         )
         val hotkeyTitles = listOf(
+            R.string.controller_hotkey_enable_button,
             R.string.emulation_swap_screens,
             R.string.emulation_cycle_landscape_layouts,
             R.string.emulation_close_game,

src/android/app/src/main/java/org/citra/citra_emu/features/settings/model/view/InputBindingSetting.kt

@@ -128,6 +128,7 @@ class InputBindingSetting(
                 Settings.KEY_BUTTON_DOWN -> NativeLibrary.ButtonType.DPAD_DOWN
                 Settings.KEY_BUTTON_LEFT -> NativeLibrary.ButtonType.DPAD_LEFT
                 Settings.KEY_BUTTON_RIGHT -> NativeLibrary.ButtonType.DPAD_RIGHT
+                Settings.HOTKEY_ENABLE -> Hotkey.ENABLE.button
                 Settings.HOTKEY_SCREEN_SWAP -> Hotkey.SWAP_SCREEN.button
                 Settings.HOTKEY_CYCLE_LAYOUT -> Hotkey.CYCLE_LAYOUT.button
                 Settings.HOTKEY_CLOSE_GAME -> Hotkey.CLOSE_GAME.button
@@ -162,36 +163,40 @@ class InputBindingSetting(
     fun removeOldMapping() {
         // Try remove all possible keys we wrote for this setting
         val oldKey = preferences.getString(reverseKey, "")
-        (setting as AbstractStringSetting).string = ""
         if (oldKey != "") {
+            (setting as AbstractStringSetting).string = ""
             preferences.edit()
                 .remove(abstractSetting.key) // Used for ui text
-                .remove(oldKey) // Used for button mapping
                 .remove(oldKey + "_GuestOrientation") // Used for axis orientation
                 .remove(oldKey + "_GuestButton") // Used for axis button
                 .remove(oldKey + "_Inverted") // used for axis inversion
-                .apply()
+                .remove(reverseKey)
+            val buttonCodes = try {
+                preferences.getStringSet(oldKey, mutableSetOf<String>())!!.toMutableSet()
+            } catch (e: ClassCastException) {
+                // if this is an int pref, either old button or an axis, so just remove it
+                preferences.edit().remove(oldKey).apply()
+                return;
+            }
+            buttonCodes.remove(buttonCode.toString());
+            preferences.edit().putStringSet(oldKey,buttonCodes).apply()
         }
     }
 
     /**
      * Helper function to write a gamepad button mapping for the setting.
      */
-    private fun writeButtonMapping(key: String) {
+    private fun writeButtonMapping(keyEvent: KeyEvent) {
         val editor = preferences.edit()
-
+        val key = getInputButtonKey(keyEvent)
-        // Remove mapping for another setting using this input
+        // Pull in all codes associated with this key
-        val oldButtonCode = preferences.getInt(key, -1)
+        // Migrate from the old int preference if need be
-        if (oldButtonCode != -1) {
+        val buttonCodes = InputBindingSetting.getButtonSet(keyEvent)
-            val oldKey = getButtonKey(oldButtonCode)
+        buttonCodes.add(buttonCode)
-            editor.remove(oldKey) // Only need to remove UI text setting, others will be overwritten
-        }
-
         // Cleanup old mapping for this setting
         removeOldMapping()
 
-        // Write new mapping
+        editor.putStringSet(key, buttonCodes.mapTo(mutableSetOf()) {it.toString()})
-        editor.putInt(key, buttonCode)
 
         // Write next reverse mapping for future cleanup
         editor.putString(reverseKey, key)
@@ -229,7 +234,7 @@ class InputBindingSetting(
         }
 
         val code = translateEventToKeyId(keyEvent)
-        writeButtonMapping(getInputButtonKey(code))
+        writeButtonMapping(keyEvent)
         val uiString = "${keyEvent.device.name}: Button $code"
         value = uiString
     }
@@ -289,6 +294,26 @@ class InputBindingSetting(
                 NativeLibrary.ButtonType.DPAD_RIGHT -> Settings.KEY_BUTTON_RIGHT
                 else -> ""
             }
+        /**
+         * Get the mutable set of int button values this key should map to given an event
+         */
+        fun getButtonSet(keyCode: KeyEvent):MutableSet<Int> {
+            val key = getInputButtonKey(keyCode)
+            val preferences = PreferenceManager.getDefaultSharedPreferences(CitraApplication.appContext)
+            var buttonCodes = try {
+                preferences.getStringSet(key, mutableSetOf<String>())
+            } catch (e: ClassCastException) {
+                val prefInt = preferences.getInt(key, -1);
+                val migratedSet = if (prefInt != -1) {
+                    mutableSetOf(prefInt.toString())
+                } else {
+                    mutableSetOf<String>()
+                }
+                migratedSet
+            }
+            if (buttonCodes == null) buttonCodes = mutableSetOf<String>()
+            return buttonCodes.mapNotNull { it.toIntOrNull() }.toMutableSet()
+        }
 
         /**
          * Helper function to get the settings key for an gamepad button.

src/android/app/src/main/java/org/citra/citra_emu/features/settings/ui/SettingsFragmentPresenter.kt

@@ -811,7 +811,7 @@ class SettingsFragmentPresenter(private val fragmentView: SettingsFragmentView)
                 add(InputBindingSetting(button, Settings.triggerTitles[i]))
             }
 
-            add(HeaderSetting(R.string.controller_hotkeys))
+            add(HeaderSetting(R.string.controller_hotkeys,R.string.controller_hotkeys_description))
             Settings.hotKeys.forEachIndexed { i: Int, key: String ->
                 val button = getInputObject(key)
                 add(InputBindingSetting(button, Settings.hotkeyTitles[i]))

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

@@ -122,6 +122,8 @@
     <string name="controller_circlepad">Circle Pad</string>
     <string name="controller_c">C-Stick</string>
     <string name="controller_hotkeys">Hotkeys</string>
+    <string name="controller_hotkeys_description">If the "Hotkey Enable" key is mapped, that key must be pressed in addition to the mapped hotkey</string>
+    <string name="controller_hotkey_enable_button">Hotkey Enable</string>
     <string name="controller_triggers">Triggers</string>
     <string name="controller_trigger">Trigger</string>
     <string name="controller_dpad">D-Pad</string>