powermanager - Initial implementation of widget showing approximate power use

apps/powermanager/metadata.json

@@ -13,6 +13,7 @@
   "storage": [
     {"name":"powermanager.boot.js","url":"boot.js"},
     {"name":"powermanager.settings.js","url":"settings.js"},
+    {"name":"powermanager.wid.js","url":"settings.js"},
     {"name":"powermanager","url":"lib.js"},
     {"name":"powermanager.default.json","url":"default.json"}
   ],

apps/powermanager/widget.js

@@ -0,0 +1,48 @@
+/* run widgets in their own function scope so they don't interfere with
+currently-running apps */
+(() => {
+
+  const APPROX_IDLE = 0.3;
+  const APPROX_HIGH_BW_BLE = 0.5;
+  const APPROX_COMPASS = process.HWVERSION == 2 ? 5.5 : 2;
+  const APPROX_HRM = process.HWVERSION == 2 ? 1 : 2.5;
+  const APPROX_CPU = 3;
+  const APPROX_GPS = process.HWVERSION == 2 ? 25 : 30;
+  const APPROX_TOUCH = 2.5;
+  const APPROX_BACKLIGHT = process.HWVERSION == 2 ? 16 : 40;
+  const MAX = APPROX_IDLE + APPROX_HIGH_BW_BLE + APPROX_COMPASS + APPROX_HRM + APPROX_CPU + APPROX_GPS + APPROX_TOUCH + APPROX_BACKLIGHT;
+
+  function draw() {
+    g.reset(); // reset the graphics context to defaults (color/font/etc)
+    // add your code
+
+    let current = APPROX_IDLE;
+    if (Bangle.isGPSOn()) current += APPROX_GPS;
+    if (Bangle.isHRMOn()) current += APPROX_HRM;
+    if (Bangle.isLocked()) current += APPROX_TOUCH + APPROX_BACKLIGHT;
+    if (Bangle.isCompassOn()) current += APPROX_COMPASS;
+    g.setColor(g.theme.fg);
+    g.setFont6x15();
+    g.setFontAlign(1,-1);
+    g.drawString("mA", this.x + 14, this.y+13);
+    g.setFont6x15();
+    g.setFontAlign(1,-1);
+    g.drawString(current.toFixed(0), this.x + 14, this.y);
+
+    timeout = 5000;
+    if (this.timeoutId !== undefined) {
+      clearTimeout(this.timeoutId);
+    }
+    this.timeoutId = setTimeout(()=>{
+      this.timeoutId = undefined;
+      this.draw();
+    }, timeout);
+  }
+
+  // add your widget
+  WIDGETS.powermanager={
+    area:"tl",
+    width: 14,
+    draw:draw
+  };
+})()