本文整理汇总了TypeScript中utils/types.isNullOrUndefined函数的典型用法代码示例。如果您正苦于以下问题：TypeScript isNullOrUndefined函数的具体用法？TypeScript isNullOrUndefined怎么用？TypeScript isNullOrUndefined使用的例子？那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。
在下文中一共展示了isNullOrUndefined函数的5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: getInstalledApps
export function getInstalledApps(callback: (IGetInstalledAppsResult) => void,
cfg?: IGetInstalledAppsConfig) {
var c: any = cfg;
if (TypeUtils.isNullOrUndefined(c)) {
c = {};
}
if (TypeUtils.isNullOrUndefined(c.icon)) {
c.icon = {};
}
if (TypeUtils.isNullOrUndefined(c.icon.format)) {
c.icon.format = 0;
}
if (TypeUtils.isNullOrUndefined(c.icon.quality)) {
c.icon.quality = 100;
}
if (TypeUtils.isNullOrUndefined(c.withIcons)) {
c.withIcons = false;
}
Apps.getInstalledListOfApps(callback, cfg);
}示例2: validateArgs
function validateArgs(source: observable.Observable, eventName: string, handler: (eventData: observable.EventData) => void, target: any) {
if (types.isNullOrUndefined(source)) {
throw new Error("source is null or undefined");
}
if (types.isNullOrUndefined(target)) {
throw new Error("target is null or undefined");
}
if (!types.isString(eventName)) {
throw new Error("eventName is not a string");
}
if (!types.isFunction(handler)) {
throw new Error("handler is not a function");
}
}示例3: Promise
return new Promise((resolve, reject) => {
try {
var types: typeof typesModule = require("utils/types");
var utils: typeof utilsModule = require("utils/utils");
var density = utils.layout.getDisplayDensity();
if (options) {
var reqWidth = options.width ? options.width * density : 0;
var reqHeight = options.height ? options.height * density : reqWidth;
var shouldKeepAspectRatio = types.isNullOrUndefined(options.keepAspectRatio) ? true : options.keepAspectRatio;
}
var takePictureIntent = new android.content.Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
var dateStamp = createDateTimeStamp();
var fileSystem: typeof fileSystemModule = require("file-system");
var tempPicturePath = fileSystem.path.join(utils.ad.getApplicationContext().getExternalFilesDir(null).getAbsolutePath(), "cameraPicture_" + dateStamp + ".jpg");
var nativeFile = new java.io.File(tempPicturePath);
var tempPictureUri = android.net.Uri.fromFile(nativeFile);
takePictureIntent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, tempPictureUri);
if (takePictureIntent.resolveActivity(utils.ad.getApplicationContext().getPackageManager()) != null) {
var appModule: typeof applicationModule = require("application");
var previousResult = appModule.android.onActivityResult;
appModule.android.onActivityResult = (requestCode: number, resultCode: number, data: android.content.Intent) => {
appModule.android.onActivityResult = previousResult;
if (requestCode === REQUEST_IMAGE_CAPTURE && resultCode === android.app.Activity.RESULT_OK) {
var options = new android.graphics.BitmapFactory.Options();
options.inJustDecodeBounds = true;
android.graphics.BitmapFactory.decodeFile(tempPicturePath, options);
var sampleSize = calculateInSampleSize(options.outWidth, options.outHeight, reqWidth, reqHeight);
var finalBitmapOptions = new android.graphics.BitmapFactory.Options();
finalBitmapOptions.inSampleSize = sampleSize;
var bitmap = android.graphics.BitmapFactory.decodeFile(tempPicturePath, finalBitmapOptions);
var scaledSizeImage = null;
if (reqHeight > 0 && reqWidth > 0) {
if (shouldKeepAspectRatio) {
var common: typeof cameraCommonModule = require("./camera-common");
var aspectSafeSize = common.getAspectSafeDimensions(bitmap.getWidth(), bitmap.getHeight(), reqWidth, reqHeight);
scaledSizeImage = android.graphics.Bitmap.createScaledBitmap(bitmap, aspectSafeSize.width, aspectSafeSize.height, true);
}
else {
scaledSizeImage = android.graphics.Bitmap.createScaledBitmap(bitmap, reqWidth, reqHeight, true);
}
}
else {
scaledSizeImage = bitmap;
}
var imageSource: typeof imageSourceModule = require("image-source");
resolve(imageSource.fromNativeSource(scaledSizeImage));
}
};
appModule.android.foregroundActivity.startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
}
} catch (e) {
if (reject) {
reject(e);
}
}
});示例4: Promise
return new Promise((resolve, reject) => {
try {
let types: typeof typesModule = require("utils/types");
let utils: typeof utilsModule = require("utils/utils");
let saveToGallery;
let reqWidth;
let reqHeight;
let shouldKeepAspectRatio;
let density = utils.layout.getDisplayDensity();
if (options) {
saveToGallery = options.saveToGallery ? true : false;
reqWidth = options.width ? options.width * density : 0;
reqHeight = options.height ? options.height * density : reqWidth;
shouldKeepAspectRatio = types.isNullOrUndefined(options.keepAspectRatio) ? true : options.keepAspectRatio;
}
let takePictureIntent = new android.content.Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
let dateStamp = createDateTimeStamp();
let picturePath: string;
let nativeFile;
let tempPictureUri;
if (saveToGallery) {
picturePath = android.os.Environment.getExternalStoragePublicDirectory(
android.os.Environment.DIRECTORY_PICTURES).getAbsolutePath() + "/" + "cameraPicture_" + dateStamp + ".jpg";
nativeFile = new java.io.File(picturePath);
tempPictureUri = android.net.Uri.fromFile(nativeFile);
takePictureIntent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, tempPictureUri);
} else {
picturePath = utils.ad.getApplicationContext().getExternalFilesDir(null).getAbsolutePath() + "/" + "cameraPicture_" + dateStamp + ".jpg";
nativeFile = new java.io.File(picturePath);
tempPictureUri = android.net.Uri.fromFile(nativeFile);
takePictureIntent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, tempPictureUri);
}
if (takePictureIntent.resolveActivity(utils.ad.getApplicationContext().getPackageManager()) != null) {
let appModule: typeof applicationModule = require("application");
let previousResult = appModule.android.onActivityResult;
appModule.android.onActivityResult = (requestCode: number, resultCode: number, data: android.content.Intent) => {
appModule.android.onActivityResult = previousResult;
if (requestCode === REQUEST_IMAGE_CAPTURE && resultCode === android.app.Activity.RESULT_OK) {
let imageSource: typeof imageSourceModule = require("image-source");
let options = new android.graphics.BitmapFactory.Options();
options.inJustDecodeBounds = true;
android.graphics.BitmapFactory.decodeFile(picturePath, options);
let sampleSize = calculateInSampleSize(options.outWidth, options.outHeight, reqWidth, reqHeight);
let finalBitmapOptions = new android.graphics.BitmapFactory.Options();
finalBitmapOptions.inSampleSize = sampleSize;
let bitmap = android.graphics.BitmapFactory.decodeFile(picturePath, finalBitmapOptions);
let scaledSizeImage = null;
if (reqHeight > 0 && reqWidth > 0) {
if (shouldKeepAspectRatio) {
let common: typeof cameraCommonModule = require("./camera-common");
let aspectSafeSize = common.getAspectSafeDimensions(bitmap.getWidth(), bitmap.getHeight(), reqWidth, reqHeight);
scaledSizeImage = android.graphics.Bitmap.createScaledBitmap(bitmap, aspectSafeSize.width, aspectSafeSize.height, true);
}
else {
scaledSizeImage = android.graphics.Bitmap.createScaledBitmap(bitmap, reqWidth, reqHeight, true);
}
}
else {
scaledSizeImage = bitmap;
}
let ei = new android.media.ExifInterface(picturePath);
let orientation = ei.getAttributeInt(android.media.ExifInterface.TAG_ORIENTATION, android.media.ExifInterface.ORIENTATION_NORMAL);
switch (orientation) {
case android.media.ExifInterface.ORIENTATION_ROTATE_90:
scaledSizeImage = rotateBitmap(scaledSizeImage, 90);
break;
case android.media.ExifInterface.ORIENTATION_ROTATE_180:
scaledSizeImage = rotateBitmap(scaledSizeImage, 180);
break;
case android.media.ExifInterface.ORIENTATION_ROTATE_270:
scaledSizeImage = rotateBitmap(scaledSizeImage, 270);
break;
}
resolve(imageSource.fromNativeSource(scaledSizeImage));
}
};
appModule.android.foregroundActivity.startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
}
} catch (e) {
if (reject) {
reject(e);
}
}
//.........这里部分代码省略.........
示例5: addLogger
export function addLogger(callback: ILogger) {
if (!isNullOrUndefined(callback)) {
_loggers.push(callback);
}
}