quicklaunch: do fewer storage interactions

Author: thyttan

apps/quicklaunch/app.js

@@ -1,31 +1,40 @@
 {
+  const R = Bangle.appRect;
+  g.clearRect(R); // clear immediately to increase perceived snappiness.
+
   const storage = require("Storage");
   let settings = storage.readJSON("quicklaunch.json", true) || {};
+  let trace = (settings[settings.trace+"app"].src=="quicklaunch.app.js") ? settings.trace : settings.trace.substring(0, settings.trace.length-1); // If the stored trace leads beyond extension screens, walk back to the last extension screen. Compatibility with "Fastload Utils" App History feature.
 
-  let reset = function(name){
-    if (!settings[name]) settings[name] = {"name":"(none)"};
-    if (!storage.read(settings[name].src)) settings[name] = {"name":"(none)"};
-    storage.write("quicklaunch.json", settings);
+  const draw = () => {
+    // Draw app hints
+    g.reset().clearRect(R).setFont("Vector", 11)
+      .setFontAlign(0,1,3).drawString(settings[trace+"lapp"].name, R.x2, R.y+R.h/2)
+      .setFontAlign(0,1,1).drawString(settings[trace+"rapp"].name, R.x, R.y+R.h/2)
+      .setFontAlign(0,1,0).drawString(settings[trace+"uapp"].name, R.x+R.w/2, R.y2)
+      .setFontAlign(0,-1,0).drawString(settings[trace+"dapp"].name, R.x+R.w/2, R.y)
+      .setFontAlign(0,0,0).drawString(settings[trace+"tapp"].name, R.x+R.w/2, R.y+R.h/2);
   };
+  draw(); // draw asap to increase perceived snappiness.
 
   let leaveTrace = function(trace) {
     if (settings[trace+"app"].name != "") {
       settings.trace = trace;
-      storage.writeJSON("quicklaunch.json", settings);
     } else { trace = trace.substring(0, trace.length-1); }
     return trace;
   };
 
   let launchApp = function(trace) {
-    if (settings[trace+"app"]) {
-      if (settings[trace+"app"].src){
-        if (settings[trace+"app"].name == "Show Launcher") Bangle.showLauncher(); else if (!storage.read(settings[trace+"app"].src)) reset(trace+"app"); else load(settings[trace+"app"].src);
-      }
+    if (settings[trace+"app"] && settings[trace+"app"].src) {
+      if (settings[trace+"app"].name == "Extension") draw();
+        else if (settings[trace+"app"].name == "Show Launcher") Bangle.showLauncher();
+          else if (!storage.read(settings[trace+"app"].src)) {
+            E.showMessage(settings[trace+"app"].src+"\n"+/*LANG*/"was not found"+".", "Quick Launch");
+            settings[trace+"app"] = {"name":"(none)"}; // reset entry.
+          } else load(settings[trace+"app"].src);
     }
   };
 
-  let trace = (settings[settings.trace+"app"].src=="quicklaunch.app.js") ? settings.trace : settings.trace.substring(0, settings.trace.length-1); // If the stored trace leads beyond extension screens, walk back to the last extension screen. Compatibility with "Fastload Utils" App History feature.
-
   let touchHandler = (_,e) => {
     if (e.type == 2) return;
     let R = Bangle.appRect;
@@ -47,15 +56,22 @@
     if (e.b == 0 && !timeoutToClock) updateTimeoutToClock();
   };
 
+  let saveAndClear = ()=> {
+    storage.writeJSON("quicklaunch.json", settings);
+    E.removeListener("kill", saveAndClear);
+    if (timeoutToClock) clearTimeout(timeoutToClock); // Compatibility with Fastload Utils.
+  }
+
   Bangle.setUI({
     mode: "custom",
     touch: touchHandler,
     swipe : swipeHandler,
     drag : onLongTouchDoPause,
-    remove: ()=>{if (timeoutToClock) clearTimeout(timeoutToClock);} // Compatibility with Fastload Utils.
+    remove: saveAndClear
   });
 
-  g.clearRect(Bangle.appRect);
+  E.on("kill", saveAndClear)
+
   "Bangle.loadWidgets()"; // Hack: Fool Fastload Utils that we call Bangle.loadWidgets(). This way we get the fastest possibe loading in whichever environment we find ourselves.
 
   // taken from Icon Launcher with some alterations
@@ -67,13 +83,4 @@
   };
   updateTimeoutToClock();
 
-  let R = Bangle.appRect; 
-
-  // Draw app hints
-  g.setFont("Vector", 11)
-    .setFontAlign(0,1,3).drawString(settings[trace+"lapp"].name, R.x2, R.y+R.h/2)
-    .setFontAlign(0,1,1).drawString(settings[trace+"rapp"].name, R.x, R.y+R.h/2)
-    .setFontAlign(0,1,0).drawString(settings[trace+"uapp"].name, R.x+R.w/2, R.y2)
-    .setFontAlign(0,-1,0).drawString(settings[trace+"dapp"].name, R.x+R.w/2, R.y)
-    .setFontAlign(0,0,0).drawString(settings[trace+"tapp"].name, R.x+R.w/2, R.y+R.h/2);
 }

apps/quicklaunch/boot.js

@@ -2,21 +2,21 @@
   const storage = require("Storage");
   let settings = storage.readJSON("quicklaunch.json", true) || {};
 
-  let reset = function(name){
-    if (!settings[name]) settings[name] = {"name":"(none)"};
-    if (!storage.read(settings[name].src)) settings[name] = {"name":"(none)"};
-    storage.write("quicklaunch.json", settings);
-  };
-
   let leaveTrace = function(trace) {
     settings.trace = trace;
     storage.writeJSON("quicklaunch.json", settings);
     return trace;
   };
 
   let launchApp = function(trace) {
-    if (settings[trace+"app"].src){ 
-      if (settings[trace+"app"].name == "Show Launcher") Bangle.showLauncher(); else if (!storage.read(settings[trace+"app"].src)) reset(trace+"app"); else load(settings[trace+"app"].src); 
+    if (settings[trace+"app"].src){
+      if (settings[trace+"app"].name == "Show Launcher") Bangle.showLauncher();
+        else if (!storage.read(settings[trace+"app"].src)) {
+          E.showMessage(settings[trace+"app"].src+"\n"+/*LANG*/"was not found"+".", "Quick Launch");
+          settings[trace+"app"] = {"name":"(none)"}; // reset entry.
+          storage.write("quicklaunch.json", settings);
+          setTimeout(load, 2000);
+        } else load(settings[trace+"app"].src);
     }
   }