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83 lines
2.4 KiB
Markdown
83 lines
2.4 KiB
Markdown
---
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category: tool
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tool: PyQT
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filename: learnqt.py
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contributors:
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- ["Nathan Hughes", "https://github.com/sirsharpest"]
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---
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**Qt** is a widely-known framework for developing cross-platform software that can be run on various software and hardware platforms with little or no change in the code, while having the power and speed of native applications. Though **Qt** was originally written in *C++*.
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This is an adaption on the C++ intro to QT by [Aleksey Kholovchuk](https://github.com/vortexxx192
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), some of the code examples should result in the same functionality
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this version just having been done using pyqt!
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```Python
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import sys
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from PyQt4 import QtGui
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def window():
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# Create an application object
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app = QtGui.QApplication(sys.argv)
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# Create a widget where our label will be placed in
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w = QtGui.QWidget()
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# Add a label to the widget
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b = QtGui.QLabel(w)
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# Set some text for the label
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b.setText("Hello World!")
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# Give some size and placement information
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w.setGeometry(100, 100, 200, 50)
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b.move(50, 20)
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# Give our window a nice title
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w.setWindowTitle("PyQt")
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# Have everything display
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w.show()
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# Execute what we have asked for, once all setup
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sys.exit(app.exec_())
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if __name__ == '__main__':
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window()
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```
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In order to get some of the more advanced features in **pyqt** we need to start looking at building additional elements.
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Here we show how to introduce a dialog popup box, useful for asking the user to confirm a decision or to provide information.
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```Python
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import sys
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from PyQt4.QtGui import *
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from PyQt4.QtCore import *
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def window():
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app = QApplication(sys.argv)
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w = QWidget()
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# Create a button and attach to widget w
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b = QPushButton(w)
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b.setText("Press me")
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b.move(50, 50)
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# Tell b to call this function when clicked
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# notice the lack of "()" on the function call
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b.clicked.connect(showdialog)
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w.setWindowTitle("PyQt Dialog")
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w.show()
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sys.exit(app.exec_())
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# This function should create a dialog window with a button
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# that waits to be clicked and then exits the program
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def showdialog():
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d = QDialog()
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b1 = QPushButton("ok", d)
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b1.move(50, 50)
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d.setWindowTitle("Dialog")
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# This modality tells the popup to block the parent whilst it's active
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d.setWindowModality(Qt.ApplicationModal)
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# On click I'd like the entire process to end
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b1.clicked.connect(sys.exit)
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d.exec_()
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if __name__ == '__main__':
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window()
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```
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