![]() Libraries of reusable QML components are called modules. Keywords: custom components, property aliases, property id (instance identifiers) In our photo viewer, we introduce a Photo component and use it in the viewer code. We learn to write our own custom components and how to use them in client code. Keywords: components, component composition, built-in and custom properties This simple photo viewer will accompany us as a running example through the next modules. We start with a blue rectangle and evolve it in a row of three photos with titles. We illustrate these concepts with simple examples. We go on to show how to compose components from simpler components, how to use JavaScript expression in property values, and how to access properties of other components. We introduce the basic concepts of QML: components and properties. In this section, we describe where to download the source code for the tutorial, which tools we need and how to run the examples. We welcome and would appreciate any of your suggestions for new topics as well as any kind of general feedback. ![]() We hope to add these topics in the future. Of course, there are many more topics on QML: flipable, web view, path view, C++ models for QML views, internationalization, dynamic object creation, performance optimization and so on. Such training sessions are already available as heavily documented QML code and just waiting to be transformed into wiki pages. The following nine modules come from materials based on QML training sessions (see Qt Training for more information). It's high time we gave an overview of the topics of this tutorial. When you have worked your way through this tutorial, you should have a clear idea whether Qt Quick is the right technology for your next UI project and you should have the technical means to realize this project. We want to show you how easy it is to build amazing UIs with Qt Quick and we want to teach you how to build these UIs. Now we must make good on these promises and this is exactly the motivation for this Qt Quick tutorial. Qt Quick is easy-to-use and easy-to-learn, it bridges the chasm between designers and developers, it is powerful and it lets us write fluid UIs. We extend QML with our own components in the very same way. Actually, all visual QML components are implemented as QGraphicObjects and are exposed to QML through Qt's meta-object system. All the properties, signals and slots of a QObject-derived class are instantly accessible from QML. Now compare this to a more traditional development process in which the designers initially come up with a fantastic UI design in Photoshop and Flash followed by the developers reimplementing this design in C ++ or Java and, after a couple of days or weeks even, the developers proudly show their result, which by the way doesn't even remotely resemble the original design (see the famous tree swing cartoon for an illustration).Īs if this is not enough yet, Qt Quick has access to the full power of Qt. This also gives developers and designers the opportunity to work side-by-side during the entire development process toward enhancing the UI and adding killer features to the application. So essentially, the designers create a UI and the developers add the functionality to that UI while having the ability to maintain close interaction with the designers. The medium I am referring to is, of course, QML code. This is all due to a very simplified development process beginning with UI designers getting access to Qt Quick through Quick Designer: a visual design tool for QML applications which closes the gap between UI designers and developers because it facilitates communication via one common medium. Quite honestly, Qt Quick empowers teams to develop applications boasting the best possible interactivity with the best possible functionality. Despite its simplicity, Qt Quick makes it easy to write the kind of fluid UIs popularized by Apple's iPhone. Thanks to its similarity to CSS and JavaScript and its simplicity, QML is easily picked up by web and Flash developers, and it is a no-brainer for Qt/C++, C and Java developers. The rest, typically the behavioral parts like the response to a mouse click, is written in JavaScript. ![]() Large parts of QML code are just CSS-style name-value pairs of properties (e.g., color: "red"). Qt Quick provides a declarative language called QML (Qt Meta-object Language) for the design and implementation of UIs. Such an interest is quite amazing for a new and unproven technology, so Qt Quick must have hit a nerve - or actually a couple of nerves. Many more companies are seriously evaluating Qt Quick. Companies use it to build user interfaces (UIs) for set-top boxes, tablet devices, in-vehicle infotainment systems, e-readers or mobile phones. 2.10 Module 9 - Writing New QML Components in Qt/C++.
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