draguboard: Compat w backswipe on newer firmwares

apps/draguboard/ChangeLog

@@ -1 +1,3 @@
 0.01: New App based on dragboard, but with a U shaped drag area
+0.02: Catch and discard swipe events on fw2v19 and up (as well as some cutting
+	edge 2v18 ones), allowing compatability with the Back Swipe app.

apps/draguboard/lib.js

@@ -104,16 +104,7 @@ exports.input = function(options) {
     }
   }
 
-  return new Promise((resolve,reject) => {
-    // Interpret touch input
-    Bangle.setUI({
-      mode: 'custom',
-      back: ()=>{
-        Bangle.setUI();
-        g.clearRect(Bangle.appRect);
-        resolve(text);
-      },
-      drag: function(event) {
+  let dragHandlerUB = function(event) {
     "ram";
 
     // drag on middle bottom rectangle
@@ -141,8 +132,25 @@ exports.input = function(options) {
       prevChar = null;
       updateTopString();
     }
-      }
+  };
+
+  let catchSwipe = (_,__)=>{
+    E.stopEventPropagation&&E.stopEventPropagation();
+  };
+
+  return new Promise((resolve,reject) => {
+    // Interpret touch input
+    Bangle.setUI({
+      mode: 'custom',
+      back: ()=>{
+        Bangle.setUI();
+        Bangle.prependListener&&Bangle.removeListener('swipe', catchSwipe); // Remove swipe lister if it was added with `Bangle.prependListener()` (fw2v19 and up).
+        g.clearRect(Bangle.appRect);
+        resolve(text);
+      },
+      drag: dragHandlerDB
     });
+    Bangle.prependListener&&Bangle.prependListener('swipe', catchSwipe); // Intercept swipes on fw2v19 and later. Should not break on older firmwares.
 
     R = Bangle.appRect;
     MIDPADDING = R.x + 35;

apps/draguboard/metadata.json

@@ -1,6 +1,6 @@
 { "id": "draguboard",
   "name": "DragUboard",
-  "version":"0.01",
+  "version":"0.02",
   "description": "A library for text input via swiping U-shaped keyboard.",
   "icon": "app.png",
   "type":"textinput",