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Qt quick desktop application example5/2/2023 If you run the application now, you should see the correct time displayed in the window. setProperty method is then called on that object. Next we use to select the first item in that list - in our case, there is only one item, our ApplicationWindow and that is what is returned. Our ApplicationWindow object is a root object because it appears at the top of the hierarchy. The code engine.rootObjects() gets all the root objects from the QML engine as a list. The time format string uses tokens such as %H to place specific parts of the time date in a specific format.įor example, if you enter the following in a Python shell you'll get the current GMT (UTC) time output.įrom PySide6.QtGui import QGuiApplicationįrom PySide6.QtQml import QQmlApplicationEngineĬurr_time = strftime("%H:%M:%S", localtime())Įngine.rootObjects().setProperty('currTime', curr_time) Two arguments - first a time format string, and second the time struct to use. Once you have a time struct you can pass this to the time.strftime() function to get a properly formatted string. Will give the time in your current local timezone. The Python standard library provides functions for handling time and date, including a number of options for getting the current time.įor example, the Python function time.gmtime() provides a struct containing the current GMT time, while time.localtime() Not the most useful of clocks! Next we'll add some Python code to get the current system time and update our clock display automatically. So far, our time display is just a fixed text string - it doesn't update, and unless you run it at the right time, it's going to be wrong. You will see the text has now moved to the bottom left.Īpplication window with text in the bottom left This is the bare minimum code required to load a QML file and display it using the QML application engine. Open up the main.py in your editor and add the following skeleton code. Create an empty folder alongside the main.py and main.qml called images.Create a file alongside main.py named main.qml, to hold our UI definition in QML.Inside your clock folder create an empty file named main.py.Create a project folder for the app, in our example we will call it: clock.You can also download a zip file containing these files. While QML does not make use of QtWidget classes, all the other parts of Qt ( QtCore, QtGui, etc.) are still available.īefore we start writing out application, we can set up our project folder with the files we'll need in the right structure below. If you've used Qt Widgets before, many of the Qt Quick concepts will seem familiar. In this tutorial we will be using PySide with the Qt Quick/QML API. If using Qt 6 you will need v6.1 or later. Properly isolated, and gives you access to all the Python libraries to power the backend of your app.īefore starting this tutorial you will need to install PySide, see the installation guides.įor building QML applications you can use PySide2 or PySide6. UI design (QML) and business logic (Python) implementation QML syntax also supports embedded Javascript which can be used to handle application logic - in simple applications the entire app can be implemented in the QML!īut using PySide you can also write your application code in Python and hook this up to your QML. UIs built with QML have more in common with mobile apps than traditional desktop applications, reflecting it's origin with Nokia, but Qt Quick can be used on all platforms supported by Qt. With it you can build completely custom UIs, with dynamic graphical elements and fluid transitions and effects. Qt Quick uses a declarative scripting language - the Qt Modeling Language (QML) - to define user interfaces. This is a modern mobile-focused API for app development, with which you can create dynamic and highly customizable user interfaces. However, Qt provides another API for building user interfaces: Qt Quick. This has been the standard method for building applications since Qt was first developed. In previous tutorials we've used the Qt Widgets API for building our applications.
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