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function SortByStoreOrder(elem) {
return this.store.index(elem.id);
}
var default_sort = SortByStoreOrder;
var default_filt = function(elem){
return true;
};
function StoreView(store, filt, sortfun) {
EventEmitter.call(this);
filt = filt || default_filt;
sortfun = sortfun || default_sort;
this.store = store;
this.add = this.add.bind(this);
this.update = this.update.bind(this);
this.remove = this.remove.bind(this);
this.recalculate = this.recalculate.bind(this);
this.store.addListener("add", this.add);
this.store.addListener("update", this.update);
this.store.addListener("remove", this.remove);
this.store.addListener("recalculate", this.recalculate);
this.recalculate(filt, sortfun);
}
_.extend(StoreView.prototype, EventEmitter.prototype, {
close: function () {
this.store.removeListener("add", this.add);
this.store.removeListener("update", this.update);
this.store.removeListener("remove", this.remove);
this.store.removeListener("recalculate", this.recalculate);
},
recalculate: function (filt, sortfun) {
if (filt) {
this.filt = filt.bind(this);
}
if (sortfun) {
this.sortfun = sortfun.bind(this);
}
this.list = this.store.list.filter(this.filt);
this.list.sort(function (a, b) {
return this.sortfun(a) - this.sortfun(b);
}.bind(this));
this.emit("recalculate");
},
index: function (elem) {
return _.sortedIndex(this.list, elem, this.sortfun);
},
add: function (elem) {
if (this.filt(elem)) {
var idx = this.index(elem);
if (idx === this.list.length) { //happens often, .push is way faster.
this.list.push(elem);
} else {
this.list.splice(idx, 0, elem);
}
this.emit("add", elem, idx);
}
},
update: function (elem) {
var idx;
var i = this.list.length;
// Search from the back, we usually update the latest entries.
while (i--) {
if (this.list[i].id === elem.id) {
idx = i;
break;
}
}
if (idx === -1) { //not contained in list
this.add(elem);
} else if (!this.filt(elem)) {
this.remove(elem.id);
} else {
if (this.sortfun(this.list[idx]) !== this.sortfun(elem)) { //sortpos has changed
this.remove(this.list[idx]);
this.add(elem);
} else {
this.list[idx] = elem;
this.emit("update", elem, idx);
}
}
},
remove: function (elem_id) {
var idx = this.list.length;
while (idx--) {
if (this.list[idx].id === elem_id) {
this.list.splice(idx, 1);
this.emit("remove", elem_id, idx);
break;
}
}
}
});
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