本文整理汇总了TypeScript中tns-core-modules/data/virtual-array.VirtualArray.on方法的典型用法代码示例。如果您正苦于以下问题：TypeScript VirtualArray.on方法的具体用法？TypeScript VirtualArray.on怎么用？TypeScript VirtualArray.on使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类tns-core-modules/data/virtual-array.VirtualArray的用法示例。
在下文中一共展示了VirtualArray.on方法的2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!");
};