voldisp: new app that displays volume change on Android device

apps/voldisp/ChangeLog

@@ -0,0 +1 @@
+0.01: New App!

apps/voldisp/boot.js

@@ -0,0 +1,75 @@
+{
+  const WIDGET_UTILS_HIDE = function() {
+    //exports.cleanup();
+    if (!global.WIDGETS) return;
+    g.reset(); // reset colors
+    for (var w of global.WIDGETS) {
+      if (w._draw) return; // already hidden
+      w._draw = w.draw;
+      w.draw = () => {};
+      w._area = w.area;
+      w.area = "";
+      if (w.x!=undefined) g.clearRect(w.x,w.y,w.x+w.width-1,w.y+23);
+    }
+  };
+  /// Show any hidden widgets
+  const WIDGET_UTILS_SHOW = function() {
+    //exports.cleanup();
+    if (!global.WIDGETS) return;
+    for (var w of global.WIDGETS) {
+      if (!w._draw) return; // not hidden
+      w.draw = w._draw;
+      w.area = w._area;
+      delete w._draw;
+      delete w._area;
+      w.draw(w);
+    }
+  };
+
+  let isWeHidingTheWidgets = false;
+  let timeout;
+  let onMusicVolume = (volPercent)=>{
+    if (timeout) {clearTimeout(timeout);}
+
+    if (Bangle.CLOCK) {
+
+      let isAllWidgetsHidden = true;
+      if (!timeout) { // No need to do this if we already did it before and it wasn't undone. I.e. the timout to execute `goAway` never ran out.
+        if (global.WIDGETS) {
+          for (var w of global.WIDGETS) {
+            if (!w._draw) {
+              isAllWidgetsHidden = false;
+              break;
+            }
+          }
+        }
+        if (!isAllWidgetsHidden) {
+          WIDGET_UTILS_HIDE();
+          isWeHidingTheWidgets = true; // Remember if it was we who hid the widgets between draws of the volume bar.
+        }
+      }
+      let barWidth = g.getWidth()*volPercent/100;
+      g.
+        setColor(0x0000).fillRect(0,0,g.getWidth(),24).
+        setColor(0xF800).fillRect(0,0,barWidth,19).
+        setColor(0xFFFF).setFont("12x20").setFontAlign(1,-1).
+        drawString("volume",barWidth,1);
+
+      let goAway = ()=>{
+        if (isWeHidingTheWidgets) {
+          g.reset().clearRect(0,0,g.getWidth(),24);
+          WIDGET_UTILS_SHOW();
+          isWeHidingTheWidgets = false;
+        } else if (Bangle.uiRedraw) {
+          Bangle.uiRedraw();
+        } else {
+          Bangle.load();
+        }
+        timeout = undefined;
+      };
+      timeout = setTimeout(goAway, 3*1000);
+    }
+  };
+  Bangle.on("musicVolume", onMusicVolume);
+  //GB({t:"audio",v:66});
+}

apps/voldisp/metadata.json

@@ -0,0 +1,15 @@
+{ "id": "voldisp",
+  "name": "Display Volume for Android",
+  "version":"0.01",
+  "description": "Display the media volume of your android device when it's changed. A bar shows up at the top of your Bangles screen. (Needs recent Gadgetbridge nightly or stable ver. 85 once out)",
+  "icon": "app.png",
+  "tags": "audio,media,android,volume,sound",
+  "type": "bootloader",
+  "supports" : ["BANGLEJS2"],
+  "screenshots" : [
+    { "url":"screenshot.png" }
+  ],
+  "storage": [
+    {"name":"voldisp.boot.js","url":"boot.js"}
+  ]
+}