Use QML WorkerScript for loading and updating models

common/modelworker.js

@@ -0,0 +1,42 @@
+function updateModelFrom(model, data) {
+    // TODO: This is very naive at the moment, we should do proper remove(),
+    // move(), set() and insert() calls, so that the UI can animate changes.
+    for (var i=0; i<data.length; i++) {
+        if (model.count < i) {
+            model.append(data[i]);
+        } else {
+            model.set(i, data[i]);
+        }
+    }
+
+    while (model.count > data.length) {
+        model.remove(model.count-1);
+    }
+
+    model.sync();
+}
+
+function updateModelWith(model, key, value, update) {
+    for (var row=0; row<model.count; row++) {
+        var current = model.get(row);
+        if (current[key] == value) {
+            for (var key in update) {
+                model.setProperty(row, key, update[key]);
+            }
+        }
+    }
+
+    model.sync();
+}
+
+WorkerScript.onMessage = function (msg) {
+    if (msg.action === 'updateModelFrom') {
+        updateModelFrom(msg.model, msg.data);
+        WorkerScript.sendMessage({callback: msg.callback});
+    } else if (msg.action === 'updateModelWith') {
+        updateModelWith(msg.model, msg.key, msg.value, msg.update);
+        WorkerScript.sendMessage({callback: msg.callback});
+    } else {
+        console.log('Unknown action: ' + msg.action);
+    }
+}