Qt ui tutorial

Qt ui tutorial

It even covers creating an installer for your app. PyQt5 refers to the most recent version 5 of Qt. You may still find the occasional mention of Py Qt4 on the web, but it is old and no longer supported.

An interesting new competitor to PyQt is Qt for Python. Its API is virtually identical. It's backed by the Qt company, and thus likely the future. We use PyQt here because it is more mature. The best way to manage dependencies in Python is via a virtual environment. A virtual environment is simply a local directory that contains the libraries for a specific project. This is unlike a system-wide installation of those libraries, which would affect all of your other projects as well.

To create a virtual environment in the current directory, execute the following command:.

Qt4 tutorial

To activate the virtual environment on Windows, run:. You can see that the virtual environment is active by the venv prefix in your shell:. The reason why we're using version 5. This version is guaranteed to work.

Besides this subtlety — Congratulations! You've successfully set up PyQt5. Time to write our very first GUI app! With the virtual environment still active, start Python. We will execute the following commands:.This tutorial will explain in detail how to take your first steps in programming with Qt using the Qt Creator integrated development environment IDE. If you want to learn how to make powerful GUIs with all the latest fancy technologies, this is not the tutorial for you.

This is firmly intended as a gentle introduction to help beginners get up and running without scaring them. We will begin by creating a new Qt-based project and modifying the generated code to show a very simple graphical user interface GUI. Once our basic application project is in place and running, we will go back and modify it to do some slightly useful things. We will start off simple and build up in complexity as you get more familiar with the widgets and other facilities at your disposal.

The open source downloads can be found on the qt. For commercial use consider getting a Qt Commercial license. To do this follow these simple steps:. Click on that and designer will switch to design mode and open up the file. You should see a blank widget.

Now do this:. Do similarly for a Line Edit and place it to the right of the Label. The exact position is not important. Click on the widget background so that both of your new widgets the label and line edit get deselected.

In the toolbar at the top click on the "Lay out Horizontally" button or press Ctrl-H to add all widgets to a horizontal layout. The layout will take care of resizing your widgets for you if the parent widget's size changes. Click on the Edit mode button in the left hand panel of creator to switch back to the text editor. You will probably see the raw xml content of the UI file at this point. Just close it we are done with it for now. Now build Hammer icon in lower left or default shortcut of Ctrl-Shift-B and run the application green "play" icon in lower left corner.

You will see some compiler messages go past in the "Compile Output" panel at the bottom whilst building. As you can see the main function is very simple. All we do is create a QApplication and then a Widget this is our custom widget that we layed out in designer and added custom behaviour to in code with the name and setName functions.

We then just call our custom setName function on the widget. Jump to: navigationsearch. Category : HowTo. Navigation menu Personal tools Sign in.

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This page was last modified on 7 Januaryat Privacy policy About Qt Wiki Disclaimers.Even if most of these tutorials are also valid for Qt5, the case of Qt5 is discussed in a separate part.

Qt Documentation

The signature of a method or function is simply its prototype. It completely describes a method or function. New to Qt? Don't know how to start? Then this wiki page is for you!

It is a step by step tutorial that presents all specificities and features of Qt. Qt pronounced as "cute", not "cu-tee" is a cross-platform framework that is usually used as a graphical toolkit, although it is also very helpful in creating CLI applications.

qt ui tutorial

Ports for Android Necessitas and iOS are also in development. They can be built from source, or better, be downloaded as an SDK from the download page. You might choose not to install them by selecting "custom install".

Be sure to keep these packages. Qt Creator should be available in nearly all distributions, and installing it should install all dependencies, like libraries, compilers, and developement headers.

Qt Tutorials For Beginners 4 - First Qt GUI widget Application

It provides a doc browser and the "designer", which makes creation of windows easier, all wrapped in a well-designed user interface. It's also one of the fastest IDE's available. Let's start by creating our first project. Follow the wizard, and after selecting the project folder and name, and select the version of Qt to use, you should land on this page. This is the project file extension. Qt uses a command line tool that parses these project files in order to generate "makefiles", files that are used by compilers to build an application.

This tool is called qmake. But, we shouldn't bother too much about qmake, since Qt Creator will do the job for us. Let's now add the entry point of our application. Follow the wizard once again, naming the file "main", and you are done.

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QApplication is a very important class. It takes care of input arguments, but also a lot of other things, and most notably, the event loop.

How to Use Qt Creator to Make Your Python UI

The event loop is a loop that waits for user input in GUI applications. Let's compile this application. By clicking on the green arrow on the bottom left, Qt Creator will compile and execute it. And what happened? The application seems to be launched and not responding. That is actually normal. The event loop is running and waiting for events, like mouse clicks on a GUI, but we did not provide any event to be processed, so it will run indefinitely.Confession: I am the opposite of the lazy coder.

I like doing things the hard way. So when I was just a fledgling programmer, and I had to design and create some dialog windows for a side project of mine an awesome add-on to AnkiSRS written in Python and QtI did what I always do: find a good resource to learn PyQt and then code everything by hand. Now, since Python is a dynamic language and I used to develop this add-on in Vim, I had no code completion whatsoever, and only the Qt documentation and that tutorial to go by.

Obviously, I had no idea what all the asterisks and ampersands meant and had to use good-old trial and error to see what would stick in Python.

qt ui tutorial

Now, on the plus side, I experimented quite a lot with the code, but not having code completion makes it really hard to learn the API. And even now, using PyCharm, code completion will not always work, because of Python being a dynamically-typed language and all.

I am still looking at the Qt documentation quite a bit. One thing I noticed, though, is that the guy who develops Anki, Damien Elmeshad all these. All changes made to this file will be lost!

Ugh, generated code! None of the dedicated, soul-cleansing and honest hard work that will shape you as a software developer. It goes without saying I stayed far away from that kind of laziness. It took me some time to come around on this. One day, I actually got a job as a professional software developer and I had much less time to work on my side-projects. So, when I wanted to implement another feature for my Anki add-on, I found I had too little time to do it the old-fashioned way, and decided to give Qt Designer a go.

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Surprisingly, I found out it can actually help you tremendously to learn how Qt works and also save you a bunch of time. Qt Designer allows you to visually create windows using a drag-and-drop interface, then spews out an XML representation of that GUI, which can be converted to code.

qt ui tutorial

That generated code will show you possibilities that would have taken a long time and a lot of StackOverflowing to figure out on your own. So, to help other people discover the wonders of this program, here is a little tutorial on how to do RAD and how to get a dialog window up and running with Qt Designer 4 and Python 3.

First, we need to install Qt Designer. On Ubuntu, you have to install both qt4-designer and the python-qt4 packages. Yes, things will be that exciting. Along the way, we will learn how to assign emitted signals to slots and how to handle events. To the left are the widgets that we can add to our freshly created dialog, to the right, from top to bottom, we see the currently added widgets, the properties of those widgets and the signals and slots currently assigned to the dialog window.

To make sure they will align nicely, I will put them together in a horizontal container, a QHBoxLayout :. This is all simple drag-and-drop: we select a widget from the left pane, drag it to the desired location in the dialog and release the mouse. Finally, we add two more label: one at the top, instructing the user what to do, and a second one near the bottom, where we soon will display our message.

Qt Designer provides an easy way to connect signals to slots. When we start out, the button box at the bottom already emits two signals: rejected and acceptedfrom the Cancel and Ok button respectively:.

The signals rejected and accepted are emitted when the cancel and OK buttons are clicked respectively, and the ground symbols indicate the object that is interested in these signals: in this case the dialog window itself. Signals are handled by slots, and so the QDialog will need to have slots for these signals. So we click the line editor widget and drag a line to anywhere on the dialog window: a ground symbol should be visible:. In the window that appears now, we can select the signal that we are interested in textEdited and assign it to a predefined slot, or we can click on Edit… and create our own slot.

In the next section we will see how to do that. When we save our project in Qt Designer, it will create a. PyQt comes with a program, pyuic4that can convert these. Two interesting command-line options are --preview or -p for shortthat will allow you to preview the dynamically created GUI, and --execute or -x for shortthat will generate Python code that can be executed as a stand-alone.The application is a small text editor which allows you to create a text file, save it, print it, or reopen and edit it again.

You can also set the font to be used. You can either fetch the Qt 5 sources from Qt Project or install them as part of Qt 5. The application is also available in the example list of Qt Creator's Welcome mode.

Setting up a new project in Qt Creator is aided by a wizard that guides you step-by-step through the project creation process. The wizard prompts you to enter the settings needed for that particular type of project and creates the project for you.

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The Qt Widgets Application wizard creates a project that contains a main source file and a set of files that specify a user interface Notepad widget :. We will take a closer look at the file contents in the following sections. We will go through the code line by line. The following lines include the header files for the Notepad widget and QApplication. All Qt classes have a header file named after them. The following line creates a QApplication object. This object manages application-wide resources and is necessary to run any Qt program that uses Qt Widgets.

It constructs an application object with argc command line arguments run in argv. The following line creates the Notepad object. This is the object for which the wizard created the class and the UI file. The user interface contains visual elements that are called widgets in Qt. Examples of widgets are text edits, scroll bars, labels, and radio buttons.

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A widget can also be a container for other widgets; a dialog or a main application window, for example. The following line shows the Notepad widget on the screen in its own window.It is accomplished using MaxPlus. Secondly, general PySide support has been greatly improved.

qt ui tutorial

PySide version 1. If you are new to Qt Designer, it is an application that allows you to easily create Qt-based user interfaces using drag and drop. Open Qt Designer and create a new form using the Widget template. Add a few items to the widget by dragging them onto the form.

You can add them too, but the only widgets you really need for this tutorial are the button and the date edit. First, select the group box and click the Layout Vertically button.

Next, click on an empty area to select the form, and then apply a form layout. Finally, click on the Adjust Size button to reduce the unused space. Your results should look something like mine. Note that generally you want to name widgets, but for this quick tutorial you can just use the default names for simplicity.

There are a lot of Qt Designer tutorials out there, check them out to learn more about this tool. Enter the following script:. Save and run this script from the same directory as the. So what magic is happening here? First, the script gets the running directory os. On startup, the current directory will be the 3ds Max running directory, but it changes to your script directory when you open or save a new script to that location.

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Next, the script passes the. LoadUiTypewhich is a wrapper for pyside-uic. It converts the. With these two items, you can create one or more instances of the UI in your script. This is all pretty straightforward. But what if you want to pass data in from the form?

Add this function to the script:. The key here is to match the PySide. QtCore data type with the type in the signal signature, QDate. Save and run, and you should see the date printed to the Listener every time you change its value. Got questions? Visit the Autodesk forums. Create Account. Sign In.The application user interface is constructed from Qt widgets by using Qt Designer. Note: The Header fileSource file and Form file fields are automatically updated to match the name of the class.

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Note: The project opens in the Edit mode, and these instructions are hidden. To return to these instructions, open the Help mode. Begin by designing the user interface and then move on to filling in the missing code.

Finally, add the find functionality. Note: To easily locate the widgets, use the search box at the top of the Sidebar. For example, to find the Label widget, start typing the word label. Applying the horizontal and vertical layouts ensures that the application UI scales to different screen sizes.

The textfinder. You need to add a private function, loadTextFileto read and display the contents of the input text file in the QTextEdit. You need a resource file. The input file can be any. Create a text file called input. Now that you have all the necessary files, click the button to compile and run your program.

Documentation contributions included herein are the copyrights of their respective owners. All other trademarks are property of their respective owners. The Introduction and Project Location dialog opens. In the Name field, type TextFinder. In the Create in field, enter the path for the project files. The Kit Selection dialog opens. Select build and run kits for your project, and click Next or Continue. The Class Information dialog opens.

In the Class name field, type TextFinder as the class name. In the Base class list, select QWidget as the base class type. Click Next or Continue. The Project Management dialog opens.