We won’t introduce here the basis of the Alfresco ADF, because we would like to focus the content on customising an existing ADF application. To better describe the tasks, we are going to use “a step by step“ approach, more practical and easy to follow for our goal.
“Designing responsive applications” in software development has been a buzzword for some years in the recent past, and we are pretty sure you have heard about it at least one time. To be all on the same page, we would prefer to begin from some very basic concepts, for a better understanding of how Alfresco ADF implements it and the advantages in development. For this purpose, let’s start from the definition of “responsive web design” on Wikipedia.
“Responsive web design (RWD) is an approach to web design aimed at allowing desktop webpages to be viewed in response to the size of the screen or web browser one is viewing with. A site designed with RWD adapts the layout to the viewing environment by using fluid, proportion-based grids, flexible images, and CSS3 media queries, an extension of the @media rule...”
In the next paragraph we are going to see how Alfresco ADF looks like on different devices and layouts and then we will discuss the technical details, mainly based on the introduction of the Google Material Design framework.
The Alfresco ADF responsive UI
Assuming you have an Alfresco ADF application up and running, developed as described in ADF 101, in this paragraph we are going to see how the web application looks like on different devices and layouts. Before viewing some samples, a crucial topic is about the tools to support and test the development.
One of the most easier (and free of charge) tool to test a generic web application on different devices and layouts, is the web browser. All the most used and modern browsers have a “Responsive Design Mode”, giving to the developer a simple and smart path for a first test and look.
Warning: The “Responsive Design Mode” gives you a close approximation as to how your site will look on a mobile device, but to get the full picture you should always test your site on real devices. Things like performances, exact rendering, etc. are only examples of possible critical issues your browser could hide, respect to a real and physical device.
In our precise case, we would like to share some further details on the Mozilla Firefox Responsive Design Mode and the Google Chrome DevTools' Device Mode. Both give you a simple way to simulate factors like: screen size, pixel density of the display and touch. All of them, with a very straightforward interface immediately available into your preferred browser. From now on, every screenshot and test has been captured using Mozilla Firefox Responsive Design Mode, on version 51.0.1 (64 bit) for Ubuntu.
Now that we know how to test our Alfresco ADF application on different devices, let’s see how the home page looks like, in a laptop, a tablet and a mobile cell phone with a low resolution.
Home of the Alfresco ADF application on a laptop (1280x768).
Home of the Alfresco ADF application on a tablet (768x1024).
Home of the Alfresco ADF application on a mobile cell phone with low resolution (360x640).
As another example, let’s see the login page on the same different layouts: a laptop, a tablet and a mobile cell phone with a low resolution. Below some screenshots showing how the pages look like.
Login page of the Alfresco ADF application on a laptop (1280x768).
Login page of the Alfresco ADF application on a tablet (768x1024).
Login page of the Alfresco ADF application on a mobile cell phone with low resolution (360x640).
In all the cases, the application is always the same and no further customisation is required to manage the different presentations.
How Alfresco ADF implements the responsive UI
Now that we know the behaviour of the responsive User Interface of an Alfresco ADF application, in this paragraph we are going to describe the technical solution used behind the scenes: firstly, introducing the technology and then describing how it is used into an Alfresco ADF application.
The MDL component library includes new versions of common user interface controls such as buttons, check boxes, and text fields, adapted to follow Material Design concepts. The library also includes enhanced and specialised features like cards, column layouts, sliders, spinners, tabs, typography, and more. MDL is free to download and use, and may be used with or without any library or development environment (such as Web Starter Kit). It is a cross-browser, cross-OS web developer's toolkit that can be used by anyone who wants to write more productive, portable, and — most importantly — usable web pages.”
From a technical point of view, the relevant thing we are interested to share, is that every ADF application is designed according to Material Design Lite. And for this reason in particular, all the ADF application are natively responsive. For a technical point of view, this means:
<!-- Google Material Design Lite --> <link href="css/material.orange-blue.min.css" rel="stylesheet"> <script src="js/material.min.js"></script> <link href="css/iconfont/material-icons.css" rel="stylesheet">
Each ADF component generates the HTML portion, according to the Material Design components. You can find the HTML template in the *.component.html file of each folder containing an ADF component.
Each ADF component can have a customized stylesheet declared into the *.component.css file. If you check into the my-adf application, in particular into each folder containing an ADF component, you can find a *.component.css file (for example in activiti, files, home, login, setting) or you cannot find it, if the default Material Design Lite stylesheet is enough (for example in about, search). Those *.component.css files are exactly the place where we are going to act to customize the colors and stylesheet in general.
As an example, let’s view below a portion of the home.component.html file (stored into the <my-adf>/app/components/home folder) showing some Material Design Lite classes together with some custom classes, used in our particular case to render the previous screenshots.
To show in practice the importance of the Cascading Style Sheets (CSS), let’s change a very small thing into the home.component.css file and see how the responsive behaviour will be affected. Below the changes to the CSS file (stored into the <my-adf>/app/components/home folder).
Saving the home.component.css file, you will see that the application will be updated automatically. Below a picture showing how the home view looks like after restarting and how the rendering changes significantly in a tablet device.
Home of the Alfresco ADF application on a tablet (768x1024) with custom CSS.
This is, of course, a very simple example showing how it is possible to customise and control the Cascading Style Sheets (CSS) into an Alfresco ADF application and how it is possible to customise and control the behaviour as a consequence.
All the content available in this tutorial has been developed and tested using Alfresco ADF v1.1.0 LA release. Below the full list of platforms, languages, frameworks and tools used here.
Linux Ubuntu 16.04.01 LTS as Operating System.
Activiti Enterprise Edition 22.214.171.124 release for Linux (running on port 9999).
Node.js version 6.9.4.
Each variation to the listed versions and tools could affect the success of the tutorial, even if the involved technologies and tasks have been defined to be as more general as possible, not related to any specific context or platform. Please let us know for any issue or problem, requesting for support into the Community Portal dedicated to the Alfresco ADF or to the Gitter space dedicated to the Alfresco Angular 2 components.