getDrawingMode() {
    return this._graphics.getDrawingMode();
  }
Get current drawing mode
@returns {string}
@example
// Image editor drawing mode
//
//    NORMAL: 'NORMAL'
//    CROPPER: 'CROPPER'
//    FREE_DRAWING: 'FREE_DRAWING'
//    LINE_DRAWING: 'LINE_DRAWING'
//    TEXT: 'TEXT'
//
if (imageEditor.getDrawingMode() === 'FREE_DRAWING') {
    imageEditor.stopDrawingMode();
}