本文整理汇总了TypeScript中tns-core-modules/data/virtual-array.VirtualArray类的典型用法代码示例。如果您正苦于以下问题：TypeScript VirtualArray类的具体用法？TypeScript VirtualArray怎么用？TypeScript VirtualArray使用的例子？那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。
在下文中一共展示了VirtualArray类的3个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的TypeScript代码示例。
示例1: function
export var test_VirtualArray_loadShouldRaiseChangeEventWithCorrectArgs = function () {
// >> virtual-array-change
var array = new virtualArrayModule.VirtualArray<number>(100);
array.loadSize = 15;
// >> (hide)
var result: virtualArrayModule.ChangedData<number>;
var index = 0;
// << (hide)
array.on(virtualArrayModule.VirtualArray.changeEvent, (args: virtualArrayModule.ChangedData<number>) => {
// Argument (args) is ChangedData<T>.
// args.eventName is "change".
// args.action is "update".
// args.removed.length and result.addedCount are equal to number of loaded items with load() method.
// >> (hide)
result = args;
// << (hide)
});
var itemsToLoad = [0, 1, 2];
array.load(index, itemsToLoad);
// << virtual-array-change
TKUnit.assert(result && result.eventName === "change" && result.action === virtualArrayModule.ChangeType.Update &&
result.removed.length === itemsToLoad.length && result.index === index && result.addedCount === itemsToLoad.length,
"VirtualArray<T> load() should raise 'change' event with correct args!");
};示例2: function
export var test_VirtualArray_shouldNotRaiseItemsLoadingIfIndexIsLoadedAndGetItemIsCalled = function () {
var array = new virtualArrayModule.VirtualArray<number>(100);
array.setItem(0, 0);
array.loadSize = 15;
var result: virtualArrayModule.ItemsLoading;
array.on(virtualArrayModule.VirtualArray.itemsLoadingEvent, (args: virtualArrayModule.ItemsLoading) => {
result = args;
});
array.getItem(0);
TKUnit.assert(types.isUndefined(result), "VirtualArray<T> getItem() should not raise 'itemsLoading' event if item is loaded!");
};示例3:
array.on(virtualArrayModule.VirtualArray.itemsLoadingEvent, (args: virtualArrayModule.ItemsLoading) => {
// Argument (args) is ItemsLoading.
// args.index is start index of the page where the requested index is located.
// args.count number of requested items.
//
// Note: Virtual array will divide total number of items to pages using "loadSize" property value. When you request an
// item at specific index the array will raise "itemsLoading" event with "ItemsLoading" argument index set to the first index of the requested page
// and count set to number of items in this page.
//
// Important: If you have already loaded items in the requested page the array will raise multiple times "itemsLoading" event to request
// all ranges of still not loaded items in this page.
var itemsToLoad = new Array<number>();
for (var i = 0; i < args.count; i++) {
itemsToLoad.push(i + args.index);
}
array.load(args.index, itemsToLoad);
});