Qt4 Linux Software Dependencies Or
1.) Open terminal either by This tutorial is aimed at beginners just starting out with PyQt/PySide and Qt Designer, it will cover very basic usage of PyQt in combination with Qt Designer.We do not provide detailed Linux install/setup help. Though it is not recommended, you can still get Qt4 libraries (e.g., libqt4-declarative, qt4-dev-tools, qt4-qmake, libqtwebkit4, and more) as software dependencies or for building an application via this third-party PPA. It is however still required for some obsolete applications. The Qt4 framework has been removed from Ubuntu 20.04 main repository.
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Qt4 Linux How To Solve It
LayoutsInstead of using fixed positions and sizes of the elements in your application you should be using layouts. The only object still left is "centralwidget" but we need it so we won't change anything about it.Now drag and drop from the "Widget Box" in Qt Designer a "List Widget" (not List View) widget and a "Push Button", drop them anywhere on the main form. You can easily remove objects by right clicking on them in that window or just by selecting them on your main form and pressing DEL key on your keyboard.For now we'll just resize our form and delete menu and status bar.Once we do that we have an (almost) empty form. Make yourself familiar with the interface, it's pretty simple.Once we got that we'll resize our main window a bit, since we don't need it that large, and we'll also remove the automatically added menu and status bar since we don't plan on using them in this tutorial.All the form elements that your design has, and their hierarchy, are listed (by default) on the right side of the Qt Designer window under "Object Inspector". PrerequisitesYou need PyQt and Qt Designer installed, and of course python.I'll be using PyQt4 with python 2.7.10 but there are no major differences between PyQt and PySide or python 3 versions of those, so if you already have PyQt5 or PySide installed there is no need to downgrade/switch.If you don't have anything installed you can get PyQt for Windows here:For OS X you can download the PyQt via homebrew: $ brew install pyqtAnd QtCreator (which contains Qt Designer) here: If you're looking for a more straightforward installation of the qt Qt Designer alone then check out this privately maintained builds page On Linux the packages required are probably in your distro repositories, if you're on Ubuntu/Debian you can run: $ apt-get install python-qt4 pyqt4-dev-tools qt4-designerAfter you're done installing requirements on your operating system open terminal/command prompt and make sure you can run pyuic4 command it should show: $ pyuic4Error: one input ui-file must be specifiedIf you get "command not found" or something along those lines try googling on how to solve it for your operating system and pyqt version.If you're on windows you most likely don't have C:\Python27\Scripts (replace 27 with your python version) in your PATH.To see how to solve that look at this SO thread Design BasicsNow that we've got everything that we need installed let's first start with simple design.Open up Qt Designer and you should see a new form dialog, pick a "Main Window" and click "Create"After that you should get a new form that you can resize, drop objects from widget box on etc.
That's why you should use layouts more often than not when designing things. It looks good right? But watch what happens when we increase our window size:Our objects stay in same positions and have same sizes even though the main form changed size, and even though the button is almost invisible. Drag and resize the list and button on the main form so that they look something like this:Now in Qt Designer menu click "View" then pick the "Preview" option, you should get the something like the screenshot above. There are many features that you can set for both widgets and layouts but I won't go in depth a lot about them.Let's design our form first without using layouts.
Now in Property Editor you should see all properties associated with that element, at this time we're just interested in "objectName" and "text" in "QAbstractButton" section. I personally only have Object Inspector and Property Editor on the right side of Qt Designer.Click on the button you added to the form. You can add hidden/closed parts of the interface via "View" menu option.
Using the designFor the application we'll need the following python modules imported: from PyQt4 import QtGuiWe also need the design code we created in the previous steps so add this too: import designSince the design file will be completely overwritten each time we change something in the design and recreate it we will not be writing any code in it, instead we'll create a new class e.g. If you get an error please Google on how to use the command pyuic on your operating system.To convert the design file to python code saved as design.py, use cd command to change to the directory holding the design.ui file and simply run: $ pyuic4 design.ui -o design.pyIf you want to specify full path for either input or output file you can do that like this: $ pyuic4 path/to/design.ui -o output/path/to/design.pyNow that we have the design.py file with the necessary design part of the application we can create our main application code and logic.Create a file main.py in the same folder as your design.py file. Ui code to python file that we can import and use, easier.To convert the file we use pyuic4 command from terminal/command prompt that should have been installed when you've installed PyQt. Ui files directly from python code, I found the method of converting the. Design to Python codeWhile it's possible to use.
But first we'll need to initialize that class on our code startup, we'll handle the class instance creation and other stuff in our main() function: def main():And to execute that main function we'll use well known: if _name_ = '_main_':In the end our whole main.py file looks like this (with short explanations of the code): from PyQt4 import QtGui # Import the PyQt4 module we'll needImport sys # We need sys so that we can pass argv to QApplicationImport design # This file holds our MainWindow and all design related things# it also keeps events etc that we defined in Qt DesignerClass ExampleApp(QtGui.QMainWindow, design.Ui_MainWindow):# Explaining super is out of the scope of this article# So please google it if you're not familar with it# Simple reason why we use it here is that it allows us to# access variables, methods etc in the design.py fileSelf.setupUi(self) # This is defined in design.py file automatically# It sets up layout and widgets that are definedApp = QtGui.QApplication(sys.argv) # A new instance of QApplicationForm = ExampleApp() # We set the form to be our ExampleApp (design)If _name_ = '_main_': # if we're running file directly and not importing itRunning that will bring up our app running completely from python code!But clicking button isn't doing anything, so we need to implement those features ourselves.
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