Step 3: Using a media picker data type (property alias "Image" in the below example) select the images on the nodes we are going to get images from.įigure 5: Selecting a image for the "About" node Step 2: Create a media folder and upload some images and adjust interest point as neededįigure 4: Adjusting the interest point on a image We are not going to use any predefined crops as our images may be used for many different crops throughout the website, our editors will use the interest point (blue dot) to specify the most important element in the image.įigure 1: Creating the image cropper data typeįigure 2: Replacing the upload data type with the image cropper on the "Image" media type Step 1: Configure cropper data type and apply to media. Following the initial load of Slimmage it will recalculate if the window is resized, such as a device changing from portrait to landscape but it will only request a new image if it hasn’t already loaded a larger image.Īssuming that the server will respect the querystring value (more on that later), this solves two problems: large images are not sent to devices that cannot display lightening the payload, “retina quality” images are served to devices that can display them. ![]() Slimmage calculates the optimum width based on the current pixel dimensions the image is being displayed at and the pixel density of the device being used. media/1001/myimage.jpg?width=100) on the client side. Because the images are going to be reused we will store all images as Media items.Įssentially, it’s a small JS library that when included on a page will alter the width variable in a querystring of a image (e.g. Our content editors are going to upload images of various sizes and proportions so we need to use the Umbraco v7.1 Image Cropper to ensure the front end images are in the correct size and proportion.In the meantime we can use a JavaScript library to achieve the same end game, I am a fan of Slimmage.js because it's designed to easily work with server side image processing and in Umbraco v7.1+ we have just that in ImageProcessor, so lets hook them up.Current info can be found at There is also a very good polyfill for the current specification of the element available at But the element has had an up and down lifespan already and it's still not fully agreed between the interested parties. W3C is working on bringing this feature into HTML vNext with the element. ![]() Employ an adaptive imaging technique to load most appropriate image dimensions based on current viewport and device pixel density.We want our editors to be able to add images easily and for that image to be reused for different crops throughout our website.We want the images to look perfect on “retina” displays.We would like images at different dimensions to be loaded at different response points.We want to develop a beautiful responsive website using CSS3 media queries.I created a component for that: import * as React from 'react' You can also wait for the Image onLayout callback to get it's layout properties and use that to update the dimensions. ![]() If you don't really bother the image is a little bit cropped, you can use cover mode with a fixed height as well: ( ) In case the ratio is not the same, dynamically change the 9 / 16 by the ratio for each different image. You will have to take care of those actions as well if you support multiple orientations. Note: When using an implementation like this, your image will not automatically resize when rotating your device, using split screen, etc. The width equals device width, so: const dimensions = Dimensions.get('window') Ĭonst imageHeight = Math.round(dimensions.width * 9 / 16) For example, if the ratio is always 16x9, the height is 9/16th of the width of the image. In case the image is always the same, you can use Dimensions.get('window').width to calculate the size the image should be. You should always add a height and width on an image in React Native. Don't add flex: 1, because that will fill the image to its parent, which is not desired in this case. The image is vertically centered, because you added flex: 1 to the style property.
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