You can add, edit & delete crop presets the cropper UI can use.
Data Type Definition Example
Content Example
The Image Cropper provides a UI to upload an image, set a focal point on the image, and use predefined crops.
By default, images in the Image Cropper will be shown based on a set focal point and only use specific crops if they are available.
The Image Cropper comes with 3 modes:
Uploading an image
Setting a focal point
Cropping the image to predefined crops
Uploading images
The editor exposes a drop area for files. Select it to upload an image.
Set focal point
By default, the Image Cropper allows the editor to set a focal point on the uploaded image.
All the preset crops are shown to give the editor a preview of what the image will look like on the frontend.
Crop and resize
The editor can fit the crop to the image to ensure that the image is presented as intended.
Powered by ImageSharp.Web
ImageSharp.Web is image processing middleware for ASP.NET.
We bundle this package with Umbraco and you can therefore take full advantage of all its features for resizing and format changing. Learn more about the built in processing commands in the official ImageSharp documentation.
Sample code
The Image Cropper comes with an API to generate crop URLs. You can also access the raw data directly as a dynamic object.
For rendering a cropped media item, the .GetCropUrl is used:
The third parameter is HtmlEncode and is by default set to true. This means you only need to define the parameter if you want to disable HTML encoding.
Example to output a "banner" crop from a cropper property with the property alias "customCropper"
To update a content property value you need the Content Service.
The following sample demonstrates how to add or change the value of an Image Cropper property programmatically. The sample creates an API controller with an action, which must be invoked via a POST request to the URL written above the action.
usingMicrosoft.AspNetCore.Mvc;usingNewtonsoft.Json;usingUmbraco.Cms.Core.Models;usingUmbraco.Cms.Core.PropertyEditors;usingUmbraco.Cms.Core.PropertyEditors.ValueConverters;usingUmbraco.Cms.Core.Services;usingUmbraco.Cms.Web.Common.Controllers;usingUmbraco.Extensions;namespaceUmbraco.Docs.Samples.Web.Property_Editors_Add_Values;publicclassCreateImageCropperValuesController:UmbracoApiController{privatereadonlyIContentService _contentService;privatereadonlyIMediaService _mediaService;privatereadonlyMediaUrlGeneratorCollection _mediaUrlGeneratorCollection;publicCreateImageCropperValuesController(IContentService contentService,IMediaService mediaService,MediaUrlGeneratorCollection mediaUrlGeneratorCollection) { _contentService = contentService; _mediaService = mediaService; _mediaUrlGeneratorCollection = mediaUrlGeneratorCollection; } // /Umbraco/Api/CreateImageCropperValues/CreateImageCropperValues [HttpPost]publicActionResult<bool> CreateImageCropperValues() { // Create a variable for the GUID of the page you want to updatevar contentKey =Guid.Parse("89974f8b-e213-4c32-9f7a-40522d87aa2f"); // Get the page using the GUID you've definedIContent? content =_contentService.GetById(contentKey);if (content ==null) {returnfalse; } // Create a variable for the GUID of the media item you want to usevar mediaKey =Guid.Parse("b6d4e98a-07c0-45f9-bfcc-52994f2806b6"); // Get the desired media fileIMedia? media =_mediaService.GetById(mediaKey);if (media ==null) {returnfalse; } // Create a variable for the image cropper and set the sourcevar imageCropperValue =newImageCropperValue { Src =media.GetUrl("umbracoFile", _mediaUrlGeneratorCollection) }; // Serialize the image cropper valuevar propertyValue =JsonConvert.SerializeObject(imageCropperValue); // Set the value of the property with alias "cropper" // - remember to add the "culture" parameter if "cropper" is set to vary by culturecontent.SetValue("cropper", propertyValue);return_contentService.Save(content).Success; }}
If you use Models Builder to generate source code (modes SourceCodeAuto or SourceCodeManual), you can use nameof([generated property name]) to access the desired property without using a magic string:
// Set the value of the "Cropper" property on content of type MyContentType// - remember to add the "culture" parameter if "cropper" is set to vary by culturecontent.SetValue(nameof(MyContentType.Cropper).ToFirstLowerInvariant(), propertyValue);
Get all the crop urls for a specific image
Crop URLs are not limited to usage within a view. IPublishedContent has a GetCropUrl extension method, which can be used to access crop URLs anywhere.
The following sample demonstrates how to use GetCropUrl to retrieve URLs for all crops defined on a specific image:
publicDictionary<string,string> GetCropUrls(IPublishedContent image){ // Get the Image Cropper property value for property with alias "umbracoFile"ImageCropperValue? imageCropperValue =image.Value<ImageCropperValue>("umbracoFile");if (imageCropperValue?.Crops==null) {returnnewDictionary<string,string>(); } // Return all crop aliases and their corresponding crop URLs as a dictionaryvar cropUrls =newDictionary<string,string>();foreach (ImageCropperValue.ImageCropperCrop crop inimageCropperValue.Crops) { // Get the cropped URL and add it to the dictionary that I will returnvar cropUrl =crop.Alias!=null?image.GetCropUrl(crop.Alias):null;if (cropUrl !=null) {cropUrls.Add(crop.Alias!, cropUrl); } }return cropUrls;}
Sample on how to change the format of the image
Below the example to output a PNG using ImageSharp.Web format command.