You have heard it many times: coding with Xojo is not just powerful and fun, it is fast, really fast! This is thanks to the fact that you have at your disposal the powerful Xojo Framework, with a lot of classes ready to use doing the hard work behind the scenes. In fact, this article shows you how can create a multi-platform RSS Reader…writing just 33 lines of code!
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The web framework got some love in Xojo 2016r2… General Changes First, the Web Framework now has support for Retina/HiDPI in supported browsers. All controls…
Comments closedIn a previous post we saw how to implement the Singleton Design Pattern in our Xojo apps. Now, it is time to look at another useful Design Pattern you can use in your apps: the Observer Design Pattern. This one solves the kind of question “How can the ‘x’ controls be automatically notified every time there are changes on ‘y’?” Sound interesting? Let’s see how!
In fact, this is the first of a two part series regarding the Observer Design Pattern. This one will focus on how easy is to implement using the interfaces already available in Xojo for UI controls like the PushButton, the BevelButton, and also for the Timer class. In Part 2, we will see how to implement the Observer Design Pattern from scratch, using our own Classes and Interfaces, so it will be easier to understand the mechanisms behind this Pattern and how to use it.
Comments closedOne of the best things that Xojo offers to programming newcomers is that they can simply jump-in and start to write code. In a matter of a few hours they’ll have a functional app! Nothing new here. (Or for not-so-newcomers, a fast way of creating a functional prototype from a idea).
Methods, properties, controls, any member that you add to project items can have its own scope. What is the scope? The scope essentially describes the code-wise accessibility of the member.
Comments closedSome years ago, Xojo introduced the ability to use Computed Properties, something that is present in other programming languages too and is based on the use of dedicated methods to assign and retrieve the property value itself. So, in other programming languages, the first of these dedicated methods (or functions), the Setter, is the one invoked every time we want to modify the value of the associated property, while the Getter method is the one used from our code to retrieve the associated value. The Object-Oriented Programming (OOP) concept found behind this feature is Method Overloading. Nevertheless, let’s make clear that Xojo Computed Properties are not methods. They aren’t! But they make our life as developers much easier compared with regular Properties.
Comments closedAnyone who has built an app in Xojo has used the Listbox method AddRow to create new rows. The iOSTable control in Xojo also has an AddRow method. However, unlike building a desktop app, AddRow is not always appropriate for iOS apps.
Comments closedHave you ever needed or wanted a populated sample database with several related tables to play around with? Perhaps you are learning about databases and database design or perhaps you want to try out a new tool such as Xojo but want a pre-build database to start with.
Comments closedThe TSA was recently in the news for paying tens of thousands of dollars for a seemingly simple iPad app to direct people to different security lines. Now we obviously don’t know everything the app does, but it sure seems like it would be pretty straightforward to make such an app, especially using Xojo.
Comments closed“Retina” is the name for high resolution screens on Mac and iOS devices while “HiDPI” is the Windows equivalent. For simplicity, I’ll use HiDPI (which really is the universal technical term) for the rest of this blog post. Now that we have HiDPI support in Xojo, if you app doesn’t use any pictures, you can simply open your project, click on Shared under Build Settings and turn on the “Supports Retina/HiDPI” option. That’s all you need to do to have a HiDPI version of your app!
Having said that, if you are creating or using pictures in your project, there may be a few adjustments you’ll need to make to your code. A little over a year ago the process of making sure we had all of the necessary graphics together to build a Retina/HiDPI IDE was added to my to-do list. While 95% of the icons created for the Xojo IDE in 2013 already existed, most of the graphics that made up the IDE itself did not, and the IDE itself needed a bit of an overhaul to get it ready for the big change, both in graphics and in code…
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