barclock: add powerSave option, perform second updates in "ram"

apps/barclock/ChangeLog

@@ -12,3 +12,4 @@
 0.12: Add settings to hide date,widgets
 0.13: Add font setting
 0.14: Use ClockFace_menu.addItems
+0.15: Add Power saving option

apps/barclock/README.md

@@ -7,4 +7,5 @@ A simple digital clock showing seconds as a horizontal bar.
 
 ## Settings
 * `Show date`: display date at the bottom of screen
-* `Font`: choose between bitmap or vector fonts
+* `Font`: choose between bitmap or vector fonts
+* `Power saving`: (Bangle.js 2 only) don't draw the seconds bar while the watch is locked

apps/barclock/clock-bar.js

@@ -14,12 +14,10 @@ let locale = require("locale");
 }
 
 function renderBar(l) {
-  if (!this.fraction) {
-    // zero-size fillRect stills draws one line of pixels, we don't want that
-    return;
-  }
-  const width = this.fraction*l.w;
-  g.fillRect(l.x, l.y, l.x+width-1, l.y+l.height-1);
+  "ram";
+  if (!this.fraction) return; // zero-size fillRect stills draws one line of pixels, we don't want that
+  if (this.powerSave && Bangle.isLocked()) return;
+  g.fillRect(l.x, l.y, l.x+this.fraction*l.w-1, l.y+l.height-1);
 }
 
 
@@ -91,6 +89,7 @@ const ClockFace = require("ClockFace"),
       this.layout.update();
     },
     update: function(date, c) {
+      "ram";
       if (c.m) this.layout.time.label = timeText(date);
       if (c.h) this.layout.ampm.label = ampmText(date);
       if (c.d && this.showDate) this.layout.date.label = dateText(date);
@@ -102,4 +101,18 @@ const ClockFace = require("ClockFace"),
       this.layout.forgetLazyState();
     },
   });
+if (clock.powerSave) {
+  Bangle.on("lock", l => {
+    if (l) {
+      clock.precision = 60;
+      clock.tick();
+      const l = clock.layout.bar;
+      setTimeout(() => g.clearRect(l.x, l.y, l.x+l.w-1, l.y+l.height-1), 100);
+    } else {
+      clock.precision = 1;
+      clock.tick();
+    }
+  });
+}
+
 clock.start();

apps/barclock/metadata.json

@@ -1,7 +1,7 @@
 {
   "id": "barclock",
   "name": "Bar Clock",
-  "version": "0.14",
+  "version": "0.15",
   "description": "A simple digital clock showing seconds as a bar",
   "icon": "clock-bar.png",
   "screenshots": [{"url":"screenshot.png"},{"url":"screenshot_pm.png"}],

apps/barclock/settings.js

@@ -17,10 +17,14 @@
       onchange: v => save("font", v),
     },
   };
-  require("ClockFace_menu").addItems(menu, save, {
+  let items = {
     showDate: s.showDate,
     loadWidgets: s.loadWidgets,
-  });
-
+  };
+  // Power saving for Bangle.js 1 doesn't make sense (no updates while screen is off anyway)
+  if (process.env.HWVERSION>1) {
+    items.powerSave = s.powerSave;
+  }
+  require("ClockFace_menu").addItems(menu, save, items);
   E.showMenu(menu);
 });