timeout to clock copied from Icon Launcher

apps/dtlaunch/app-b2.js

@@ -10,12 +10,18 @@ let settings = Object.assign({
     direct: false,
     oneClickExit: false,
     swipeExit: false,
+    timeOut: "Off"
   }, require('Storage').readJSON("dtlaunch.json", true) || {});
   
   if (settings.oneClickExit) {
     var buttonWatch = setWatch(_=> returnToClock, BTN1);
   } 
   
+  // taken from Icon Launcher with minor alterations
+  if (settings.timeOut!="Off"){
+    let time=parseInt(settings.timeOut);  //the "s" will be trimmed by the parseInt
+    var timeoutToClock = setTimeout(returnToClock,time*1000);  
+  }
   let s = require("Storage");
     var apps = s.list(/\.info$/).map(app=>{
     let a=s.readJSON(app,1);
@@ -142,6 +148,9 @@ Bangle.on("touch",touchListenerDt);
   const returnToClock = function() {
     Bangle.setUI();
     clearWatch(buttonWatch);
+    delete buttonWatch;
+    clearTimeout(timeoutToClock);
+    delete timeoutToClock;
     delete s;
     delete a;
     delete n;

apps/dtlaunch/settings-b2.js

@@ -6,50 +6,63 @@
     showLaunchers: true,
     direct: false,
     oneClickExit:false,
-    swipeExit: false
+    swipeExit: false,
+    timeOut: "Off"
   }, require('Storage').readJSON(FILE, true) || {});
 
   function writeSettings() {
     require('Storage').writeJSON(FILE, settings);
   }
 
+  const timeOutChoices = [/*LANG*/"Off", "10s", "15s", "20s", "30s"];
+
   E.showMenu({
     "" : { "title" : "Desktop launcher" },
-    "< Back" : () => back(),
-    'Show clocks': {
+    /*LANG*/"< Back" : () => back(),
+    /*LANG*/'Show clocks': {
       value: settings.showClocks,
       onchange: v => {
         settings.showClocks = v;
         writeSettings();
       }
     },
-    'Show launchers': {
+    /*LANG*/'Show launchers': {
       value: settings.showLaunchers,
       onchange: v => {
         settings.showLaunchers = v;
         writeSettings();
       }
     },
-    'Direct launch': {
+    /*LANG*/'Direct launch': {
       value: settings.direct,
       onchange: v => {
         settings.direct = v;
         writeSettings();
       }
     },
-    'Swipe Exit': {
+    /*LANG*/'Swipe Exit': {
       value: settings.swipeExit,
       onchange: v => {
         settings.swipeExit = v;
         writeSettings();
       }
     },
-    'One click exit': {
+    /*LANG*/'One click exit': {
       value: settings.oneClickExit,
       onchange: v => {
         settings.oneClickExit = v;
         writeSettings();
       }
+    },
+    /*LANG*/'Time Out': {
+      value: timeOutChoices.indexOf(settings.timeOut),
+      min: 0,
+      max: timeOutChoices.length-1,
+      format: v => timeOutChoices[v],
+      onchange: m => {
+        settings.timeOut = m;
+        writeSettings();
       }
+    },
   });
 })