function takePictureFromFileWP()

in src/windows/CameraProxy.js [173:232]
20 lines of code
3 McCabe index (conditional complexity)

function takePictureFromFileWP (successCallback, errorCallback, args) {
    var mediaType = args[6];
    var destinationType = args[1];
    var targetWidth = args[3];
    var targetHeight = args[4];
    var encodingType = args[5];

    /*
        Need to add and remove an event listener to catch activation state
        Using FileOpenPicker will suspend the app and it's required to catch the PickSingleFileAndContinue
        https://msdn.microsoft.com/en-us/library/windows/apps/xaml/dn631755.aspx
    */
    var filePickerActivationHandler = function (eventArgs) {
        if (eventArgs.kind === Windows.ApplicationModel.Activation.ActivationKind.pickFileContinuation) {
            var file = eventArgs.files[0];
            if (!file) {
                errorCallback("User didn't choose a file.");
                webUIApp.removeEventListener('activated', filePickerActivationHandler);
                return;
            }
            if (destinationType === Camera.DestinationType.FILE_URI) {
                if (targetHeight > 0 && targetWidth > 0) {
                    resizeImage(successCallback, errorCallback, file, targetWidth, targetHeight, encodingType);
                } else {
                    var storageFolder = getAppData().localFolder;
                    file.copyAsync(storageFolder, file.name, Windows.Storage.NameCollisionOption.replaceExisting).done(function (storageFile) {
                        successCallback(URL.createObjectURL(storageFile));
                    }, function () {
                        errorCallback("Can't access localStorage folder.");
                    });
                }
            } else {
                if (targetHeight > 0 && targetWidth > 0) {
                    resizeImageBase64(successCallback, errorCallback, file, targetWidth, targetHeight);
                } else {
                    fileIO.readBufferAsync(file).done(function (buffer) {
                        var strBase64 = encodeToBase64String(buffer);
                        successCallback(strBase64);
                    }, errorCallback);
                }
            }
            webUIApp.removeEventListener('activated', filePickerActivationHandler);
        }
    };

    var fileOpenPicker = new Windows.Storage.Pickers.FileOpenPicker();
    if (mediaType === Camera.MediaType.PICTURE) {
        fileOpenPicker.fileTypeFilter.replaceAll(['.png', '.jpg', '.jpeg']);
        fileOpenPicker.suggestedStartLocation = pickerLocId.picturesLibrary;
    } else if (mediaType === Camera.MediaType.VIDEO) {
        fileOpenPicker.fileTypeFilter.replaceAll(windowsPhoneVideoContainers);
        fileOpenPicker.suggestedStartLocation = pickerLocId.videosLibrary;
    } else {
        fileOpenPicker.fileTypeFilter.replaceAll(['*']);
        fileOpenPicker.suggestedStartLocation = pickerLocId.documentsLibrary;
    }

    webUIApp.addEventListener('activated', filePickerActivationHandler);
    fileOpenPicker.pickSingleFileAndContinue();
}