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More caching for fewer redraws and backlight refreshes

master
David Volovskiy 2025-04-19 14:56:13 -04:00
parent f66efa1b36
commit a3209238ba
1 changed files with 31 additions and 9 deletions
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40
apps/jsonclock/app.js
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@ -7,6 +7,10 @@ const LOCATION_FILE = "mylocation.json";
const h = g.getHeight(); const h = g.getHeight();
const w = g.getWidth(); const w = g.getWidth();
let location; let location;
let cachedSunTimes = null;
let lastSunCalcDate = null;
var prevVals = {};
let drawTimeout;
var settings = { var settings = {
hr_12: global_settings["12hour"] !== undefined ? global_settings["12hour"] : false, hr_12: global_settings["12hour"] !== undefined ? global_settings["12hour"] : false,
@ -14,7 +18,7 @@ var settings = {
}; };
let clrs = { let clrs = {
tab : settings.dark_mode ? "#2d2d30" : "#DDDDDD", // grey tab : "#DDDDDD", // grey
keys: settings.dark_mode ? "#4287f5" : "#0000FF", // blue keys: settings.dark_mode ? "#4287f5" : "#0000FF", // blue
strings: settings.dark_mode ? "#F0A000" : "#FF0000", // orange or red strings: settings.dark_mode ? "#F0A000" : "#FF0000", // orange or red
ints: settings.dark_mode ? "#00FF00" : "#00FF00", // green ints: settings.dark_mode ? "#00FF00" : "#00FF00", // green
@ -81,18 +85,22 @@ function extractTime(d){
} }
} }
function getVal() { function getVal() {
vals = {}; const vals = {};
const now = new Date(); const now = new Date();
const sunTimes = SunCalc.getTimes(now, location.lat, location.lon); const currentDateStr = extractDate(now);
if (lastSunCalcDate !== currentDateStr) {
cachedSunTimes = SunCalc.getTimes(now, location.lat, location.lon);
lastSunCalcDate = currentDateStr;
}
vals.time = extractTime(now); vals.time = extractTime(now);
vals.date = extractDate(now); vals.date = currentDateStr;
vals.rise = extractTime(sunTimes.sunrise); vals.rise = extractTime(cachedSunTimes.sunrise);
vals.set = extractTime(sunTimes.sunset); vals.set = extractTime(cachedSunTimes.sunset);
vals.batt_pct = E.getBattery(); vals.batt_pct = E.getBattery();
vals.steps = getSteps(); vals.steps = getSteps();
return vals; return vals;
} }
function loadJson() { function loadJson() {
@ -158,6 +166,9 @@ function redraw() {
const key = kvMatch[1]; const key = kvMatch[1];
let value = kvMatch[2]; let value = kvMatch[2];
if (prevVals.key == value) continue;
prevVals.key = value;
// Key // Key
g.setColor(clrs.keys); g.setColor(clrs.keys);
g.drawString(indent + `"${key}"`, numWidth, y); g.drawString(indent + `"${key}"`, numWidth, y);
@ -200,6 +211,11 @@ function redrawValues(){
loadJson(); loadJson();
clearVals(); clearVals();
redraw(); redraw();
if (drawTimeout) clearTimeout(drawTimeout);
drawTimeout = setTimeout(function() {
drawTimeout = undefined;
redrawValues();
}, 60000 - (Date.now() % 60000));
} }
function scroll(amount) { function scroll(amount) {
@ -219,6 +235,12 @@ Bangle.on('touch', (zone, e) => {
Bangle.on('drag', (e) => scroll(-e.dy)); Bangle.on('drag', (e) => scroll(-e.dy));
Bangle.on('backlight', function(on) {
if (on) {
redrawValues(); // or just draw() if you want full re-render
}
});
Bangle.setUI({ Bangle.setUI({
mode: "clock", mode: "clock",
remove: function () { remove: function () {
@ -231,4 +253,4 @@ loadLocation();
Bangle.loadWidgets(); Bangle.loadWidgets();
widget_utils.hide(); widget_utils.hide();
draw(); draw();
setInterval(redrawValues, 5000); setTimeout(Bangle.drawWidgets,0);