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Fix: ListView not showing first items of VirtArray

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This commit is contained in:
vakrilov
2017-02-09 16:52:14 +02:00
parent 4ce4b12859
commit 87f936bcd8
5 changed files with 54 additions and 54 deletions
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45
tns-core-modules/data/virtual-array/virtual-array.ts
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@ -1,17 +1,19 @@
import * as observable from "data/observable";
import * as types from "utils/types";
import { Observable } from "data/observable";
import * as virtualArrayDef from "data/virtual-array";
var CHANGE = "change", UPDATE = "update", DELETE = "delete", ADD = "add";
const CHANGE = "change";
const UPDATE = "update";
const DELETE = "delete";
const ADD = "add";
export class ChangeType implements virtualArrayDef.ChangeType {
static Add = "add";
static Delete = "delete";
static Update = "update";
static Splice = "splice";
static Add = ADD;
static Delete = DELETE;
static Update = UPDATE;
static Splice = CHANGE;
}
export class VirtualArray<T> extends observable.Observable {
export class VirtualArray<T> extends Observable implements virtualArrayDef.VirtualArray<T> {
public static changeEvent = CHANGE;
public static itemsLoadingEvent = "itemsLoading";
@ -36,8 +38,8 @@ export class VirtualArray<T> extends observable.Observable {
set length(value: number) {
if (this._length !== value) {
var index = this._length;
var count = value - this._length;
const index = this._length;
const count = value - this._length;
this._length = value;
@ -60,9 +62,9 @@ export class VirtualArray<T> extends observable.Observable {
}
getItem(index: number): T {
var item = this._cache[index];
const item = this._cache[index];
if (types.isUndefined(item)) {
if (item === undefined) {
if (index >= 0 && index < this.length && this._requestedIndexes.indexOf(index) < 0 && this._loadedIndexes.indexOf(index) < 0) {
this.requestItems(index);
}
@ -78,10 +80,9 @@ export class VirtualArray<T> extends observable.Observable {
}
load(index: number, items: T[]): void {
var i: number;
for (i = 0; i < items.length; i++) {
for (let i = 0; i < items.length; i++) {
var itemIndex = index + i;
const itemIndex = index + i;
this._cache[itemIndex] = items[i];
@ -94,7 +95,7 @@ export class VirtualArray<T> extends observable.Observable {
// Remove requested but never loaded indexes.
if (this._requestedIndexes.length > 0) {
for (i = 0; i < this.loadSize - items.length; i++) {
for (let i = 0; i < this.loadSize - items.length; i++) {
this._requestedIndexes.splice(this._requestedIndexes.indexOf(index + i), 1);
}
}
@ -109,14 +110,14 @@ export class VirtualArray<T> extends observable.Observable {
}
private requestItems(index: number): void {
var indexesToLoad = [];
const indexesToLoad = [];
var pageIndex = this._loadSize > 0 ? this._loadSize * Math.floor(index / this._loadSize) : index;
var count = 0;
var start = -1;
const pageIndex = this._loadSize > 0 ? this._loadSize * Math.floor(index / this._loadSize) : index;
let count = 0;
let start = -1;
for (var i = 0; i < this.loadSize; i++) {
var itemIndex = pageIndex + i;
for (let i = 0; i < this.loadSize; i++) {
const itemIndex = pageIndex + i;
if (itemIndex >= this._length) {
break;