Expose Back actions in app settings

app/src/main/java/com/steamdeck/launcher/MainActivity.kt

@@ -211,6 +211,7 @@ class MainActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         theme = SessionPrefs.theme(this)
+        backActionsInverted = SessionPrefs.backActionsInverted(this)
         setContent {
             SteamDeckTheme(theme) {
                 val sm = settingsMode
@@ -241,6 +242,7 @@ class MainActivity : ComponentActivity() {
                         packageStage = pkgStage,
                         packagePercent = pkgPercent,
                         sessionRunning = SessionState.running,
+                        backActionsInverted = backActionsInverted,
                     ),
                     FrontEndActions(
                         onPlay = { startSession(Intent(this, SessionActivity::class.java)) },
@@ -301,6 +303,10 @@ class MainActivity : ComponentActivity() {
                         onTheme = { id -> SessionPrefs.setTheme(this, id); theme = id },
                         onHomeApp = { manageHomeApp() },
                         onAndroidApp = { app -> launchAndroidApp(app) },
+                        onBackActionsInverted = { inverted ->
+                            SessionPrefs.setBackActionsInverted(this, inverted)
+                            backActionsInverted = inverted
+                        },
                     ),
                     page = page,
                 )

app/src/main/java/com/steamdeck/launcher/SessionActivity.kt

@@ -284,7 +284,7 @@ class SessionActivity : ComponentActivity(), SurfaceHolder.Callback {
             performBackAction(double = false)
         }
         pendingBackAction = pending
-        uiHandler.postDelayed(pending, android.view.ViewConfiguration.getDoubleTapTimeout().toLong())
+        uiHandler.postDelayed(pending, BACK_DOUBLE_PRESS_TIMEOUT_MS)
     }
 
     private fun performBackAction(double: Boolean) {
@@ -1005,6 +1005,7 @@ class SessionActivity : ComponentActivity(), SurfaceHolder.Callback {
 
     companion object {
         private const val TAG = "SessionActivity"
+        private const val BACK_DOUBLE_PRESS_TIMEOUT_MS = 500L
         /** Compositor scale modes (Container.FULLSCREEN_* values): 1 = fit with bars, centred. */
         private const val SCALE_FIT = 1
         private const val ALIGN_CENTER = 0

app/src/main/java/com/steamdeck/launcher/ui/FrontEndScreen.kt

@@ -141,6 +141,7 @@ class FrontEndState(
     val packageStage: String? = null,
     val packagePercent: Int = -1,
     val sessionRunning: Boolean = false,
+    val backActionsInverted: Boolean = false,
 )
 
 class FrontEndActions(
@@ -169,6 +170,7 @@ class FrontEndActions(
     val onTheme: (String) -> Unit = {},
     val onHomeApp: () -> Unit = {},
     val onAndroidApp: (com.steamdeck.launcher.HomeApp.LaunchableApp) -> Unit = {},
+    val onBackActionsInverted: (Boolean) -> Unit = {},
 )
 
 
@@ -692,6 +694,12 @@ private fun SetupPanel(s: FrontEndState, a: FrontEndActions) {
                     ActionRow("ROMs folder", s.romsDir ?: "Choose where emulator games are stored", "Choose", a.onRoms)
                 }
                 SettingsGroup("Session") {
+                    ToggleRow(
+                        host, "back-actions", "Invert Back actions",
+                        if (s.backActionsInverted) "Back once opens Steam QAM; twice opens the in-session menu."
+                        else "Back once opens the in-session menu; twice opens Steam QAM.",
+                        s.backActionsInverted, onChange = a.onBackActionsInverted,
+                    )
                     SettingsRow("Frame generation", "Select the frame generation mode") {
                         Box {
                             ValueChip(s.frameGenLabel, host.open == "fg") { host.open = if (host.open == "fg") null else "fg" }

docs/progress-log.md

@@ -188,9 +188,9 @@ State: **main = `90c7574`** (PR #14 merge), main build run 35895701784. No tag,
 - Thor Pro: trackpad tap; the 1–2 min in-game crash once a `crash.log` arrives.
 - Xfce as a second desktop shell (Max's branch runs XFCE 4.20 on labwc) - a catalog package + a
   shell choice in the Desktop cog; comfort, not performance.
-- Quick Access Menu for non-Deck pads - Back double-press now routes to the existing Guide+A chord;
-  the in-session and Steam settings can swap the single- and double-Back actions. Device confirmation
-  is still needed.
+- Quick Access Menu for non-Deck pads - Back double-press (500 ms) now routes to the existing Guide+A
+  chord; the in-session menu, Steam settings, and Setup › Session can swap the single- and double-Back
+  actions. Device confirmation is still needed.
 - FlatOut shrink: try `vk_wsi_force_swapchain_to_current_extent=false` via `steamdeck-env`.
 - Max's stricter `winnative-directaudio` guards; `winnative-epic-launch` (a feature).
 - Rename before anything truly public: "SteamDeck" is Valve's mark.