You can find a whole web page of Qt5 CSS examples here.įor example, suppose you want a label to be blue instead of black. For this you have to resort to CSS (Cascading Style Sheets). While PyQt5 widgets have a plethora of useful methods, the designers left out such things as changing colors and borders. And, again, once you change the code, you can’t do back to the designer. Writing the code yourself is easier, and you probably would want to modify the code anyway. You can also do this in the QtDesigner, but the event interface in the designer is a lot of trouble to use. You can easily write analogous programs in PyQt5 to handle events much as you do in tkinter. Once you have done this and edited the Python file, you can never go back to the designer.Įvents in Qt5 are referred to as signals and slots, where the event is a signal and the callback function is a slot. ui and you have to run the pyuic5.exe program to convert the. It actually includes layouts, and you can at least look at what code it generates. PyQt5 provides the QtDesigner app which allows you create layouts visually. These are essentially spacers that grow to fill the space on either side of the widget. In order to put a button in a grid and not have it stretched to fill the cell, you have to add a QHBoxLayout inside the cell and then perform a hbox.addStretch(1) before and after the button to center it. The biggest single difference is that if you place a widget in a grid cell, it expands to fill the entire cell. The QGridLayout is similar to, but not the same as, the tkinter grid. You can add widgets to the box layouts and they will line up horizontally or vertically. PyQt5 has three layout managers: QHBoxLayout, QVBoxLayout and QGridLayout. Grid allows you set up an n x n grid and place the objects in one or more grid cells. Pack arranges the objects in the frame you provide. Tkinter has two major layout managers, pack() and grid(). I already noted that the QRadioButtons work better if you derive a class that holds the button index or title, using a Mediator pattern. It is also worth noting that all PyQt widgets have Tooltips: helpful phrases that can explain what a widget is for. In fact, since the listbox automatically includes a slider, you will find it a bit easier. If you want to build a GUI using listboxes, buttons and checkboxes, you won’t have any trouble with PyQt. He has also written a book on PyQt and there is a link to it at the bottom of the tutorial. I learned how to use PyQt5 from the on-line PyQT5 reference guide as well as from this short tutorial by Michael Herrman. It allows you to select any person in our database and assign them a role in the current or an older production. The left-hand table is the final cast, sorted by role-type and sex, which amounts to one simple database query. This screen represents a way to create a cast list for the current and previous shows and generate spreadsheets of those casts for the Board, the cast and the directors to work with. I built the Tkinter version of this interface as part of a larger development project to interface our opera company’s data to a new MySQL database, where building a UI gave us the ability to view the information in more flexible ways. There was no clear winner of this experiment: once you have climbed the learning curve you can build nice-looking systems either way. The rest are just hardcoded,īut basically, the systems do about the same things and are about equally easy (or hard) to use, and you can’t go wrong using either of them. The tkinter version is fully integrated with the database, but I only bother to connect the right hand searchbox and listbox to the database in PyQt5. Each system has different advantages and disadvantages, and we’ll summarize them in the article that follows. I spent a week learning PyQt5 and building the new interface to match the one I had already built in Tkinter. They show that you can build pretty much the same kind of GUI with either system. The two figures above show the same interface developed in Tkinter and PyQt5.
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