• 设为首页
  • 点击收藏
  • 手机版
    手机扫一扫访问
    迪恩网络手机版
  • 关注官方公众号
    微信扫一扫关注
    公众号
登陆 注册

TypeScript types.isNullOrUndefined函数代码示例

原作者: [db:作者] 来自: [db:来源] 收藏 邀请

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，您的评价将有助于我们的系统推荐出更棒的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);
}
开发者ID:mkloubert，项目名称:nativescript-applist，代码行数:26，代码来源:index.ts


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");
    }
}
开发者ID:329379172，项目名称:NativeScript，代码行数:17，代码来源:weak-event-listener.ts


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);
            }
        }
    });
开发者ID:ahmadissa2，项目名称:NativeScript，代码行数:70，代码来源:camera.android.ts


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.........
开发者ID:329379172，项目名称:NativeScript，代码行数:101，代码来源:camera.android.ts


示例5: addLogger

export function addLogger(callback: ILogger) {
    if (!isNullOrUndefined(callback)) {
        _loggers.push(callback);
    }
}
开发者ID:mkloubert，项目名称:nativescript-social-login，代码行数:5，代码来源:index.ts



注：本文中的utils/types.isNullOrUndefined函数示例由纯净天空整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。

鲜花
握手
雷人
路过
鸡蛋
该文章已有0人参与评论

请发表评论

全部评论

专题导读
More+
上一篇：
TypeScript types.isString函数代码示例发布时间：2022-05-25
下一篇：
TypeScript stringUtils.StringUtils类代码示例发布时间：2022-05-25
热门推荐
More+
热门话题
More+
阅读排行榜

扫描微信二维码

查看手机版网站

随时了解更新最新资讯

139-2527-9053

在线客服（服务时间 9:00～18:00）

在线QQ客服
地址：深圳市南山区西丽大学城创智工业园
电邮：jeky_zhao#qq.com
移动电话：139-2527-9053

Powered by 互联科技 X3.4© 2001-2213 极客世界.|Sitemap