msgtwscr: new app!

Temporarily activate scroll on twist function when a new message triggers the message app.

apps/msgtwscr/ChangeLog

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+0.01: New App!

apps/msgtwscr/README.md

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+# Message Scroll on Twist
+
+Temporarily activate scroll on twist function when a new message triggers the message app. This way it's possible to scroll through a message in the message scroller hands free.
+
+## Usage
+
+This is a bootloader app and only needs to be installed to add the functionality to the watch.
+
+## Notes
+
+Tried with [a development version "Message UI" app](https://github.com/espruino/BangleApps/pull/3685) centered around the message scroller. Should work with the standard version as well.
+
+## Requests
+
+Mention @thyttan in an issue on the espruino/BangleApps repository.
+
+## Creator
+
+thyttan

apps/msgtwscr/boot.js

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+{
+  // If doing regular loads, not Bangle.load, this is used:
+  if (global.__FILE__=="messagegui.new.js") {
+    onTwistEmitDrag();
+  }
+
+  // If Fastload Utils is installed this is used:
+  Bangle.on("message", (_, msg)=>{if (Bangle.CLOCK && msg.new) {
+    setTimeout(()=>{
+      if (global.__FILE__=="messagegui.new.js") {
+        onTwistEmitDrag();
+      }
+    },700) // It feels like there's a more elegant solution than checking the filename after 700 milliseconds. But this at least seems to work w/o sometimes activating when it shouldn't.
+  }});
+
+  // twistThreshold How much acceleration to register a twist of the watch strap? Can be negative for opposite direction. default = 800
+  // twistMaxY Maximum acceleration in Y to trigger a twist (low Y means watch is facing the right way up). default = -800
+  // twistTimeout How little time (in ms) must a twist take from low->high acceleration? default = 1000
+  function onTwistEmitDrag() {
+    Bangle.setOptions({twistThreshold:2500, twistMaxY:-800, twistTimeout:400});
+    Bangle.on("twist", ()=>{
+      let i = 25;
+      const int = setInterval(() => {
+        Bangle.emit("drag", {dy:-3})
+        i--;
+        if (i<1) clearInterval(int);
+      }, 10);
+    });
+
+  }
+}

apps/msgtwscr/metadata.json

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+{ "id": "msgtwscr",
+  "name": "Message Scroll on Twist",
+  "version":"0.01",
+  "description": "Temporarily activate scroll on twist function when a new message triggers the message app.",
+  "icon": "app.png",
+  "tags": "messages,tweak, scroll",
+  "type": "bootloader",
+  "supports" : ["BANGLEJS2"],
+  "readme": "README.md",
+  "storage": [
+    {"name":"msgtwscr.boot.js","url":"boot.js"}
+  ]
+}