Swipe to back prototype

apps/backswipe/ChangeLog

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+0.01: New App!

apps/backswipe/boot.js

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+(function () {
+  // Overrride the default setUI method, so we can save the back button callback
+  var setUI = Bangle.setUI;
+  Bangle.setUI = function (mode, cb) {
+    var options = {};
+    if ("object"==typeof mode) {
+      options = mode;
+    }
+
+    print("Setting UI");
+    if(global.BACK) delete global.BACK;
+    if (options && options.back) {
+      print("Saving back callback");
+      global.BACK = options.back;
+    }
+    setUI(mode, cb);
+  };
+
+  function goBack(lr, ud) {
+    // if it is a left to right swipe
+    if (lr === 1) {
+      print("Back swipe detected");
+      // if we're in an app that has a back button, run the callback for it
+      if (global.BACK) {
+        print("Running back callback");
+        global.BACK();
+      }
+    }
+  }
+
+  // Listen to left to right swipe
+  Bangle.on("swipe", goBack);
+})();

apps/backswipe/metadata.json

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+{ "id": "backswipe",
+  "name": "Back Swipe",
+  "shortName":"BackSwipe",
+  "version":"0.01",
+  "description": "Service that allows you to use an app's back button using left to right swipe gesture",
+  "icon": "app.png",
+  "tags": "back,gesture,swipe",
+  "supports" : ["BANGLEJS2"],
+  "type": "bootloader",
+  "storage": [
+    {"name":"backswipe.boot.js","url":"boot.js"}
+  ]
+}