mirror of
https://github.com/adambard/learnxinyminutes-docs.git
synced 2024-11-26 20:34:32 +03:00
84 lines
2.4 KiB
Markdown
84 lines
2.4 KiB
Markdown
---
|
|
category: tool
|
|
tool: PyQT
|
|
filename: learnqt.py
|
|
contributors:
|
|
- ["Nathan Hughes", "https://github.com/sirsharpest"]
|
|
lang: en
|
|
---
|
|
|
|
**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++*.
|
|
|
|
|
|
This is an adaption on the C++ intro to QT by [Aleksey Kholovchuk](https://github.com/vortexxx192
|
|
), some of the code examples should result in the same functionality
|
|
this version just having been done using pyqt!
|
|
|
|
```Python
|
|
import sys
|
|
from PyQt4 import QtGui
|
|
|
|
def window():
|
|
# Create an application object
|
|
app = QtGui.QApplication(sys.argv)
|
|
# Create a widget where our label will be placed in
|
|
w = QtGui.QWidget()
|
|
# Add a label to the widget
|
|
b = QtGui.QLabel(w)
|
|
# Set some text for the label
|
|
b.setText("Hello World!")
|
|
# Give some size and placement information
|
|
w.setGeometry(100, 100, 200, 50)
|
|
b.move(50, 20)
|
|
# Give our window a nice title
|
|
w.setWindowTitle("PyQt")
|
|
# Have everything display
|
|
w.show()
|
|
# Execute what we have asked for, once all setup
|
|
sys.exit(app.exec_())
|
|
|
|
if __name__ == '__main__':
|
|
window()
|
|
|
|
```
|
|
|
|
In order to get some of the more advanced features in **pyqt** we need to start looking at building additional elements.
|
|
Here we show how to introduce a dialog popup box, useful for asking the user to confirm a decision or to provide information.
|
|
|
|
```Python
|
|
import sys
|
|
from PyQt4.QtGui import *
|
|
from PyQt4.QtCore import *
|
|
|
|
|
|
def window():
|
|
app = QApplication(sys.argv)
|
|
w = QWidget()
|
|
# Create a button and attach to widget w
|
|
b = QPushButton(w)
|
|
b.setText("Press me")
|
|
b.move(50, 50)
|
|
# Tell b to call this function when clicked
|
|
# notice the lack of "()" on the function call
|
|
b.clicked.connect(showdialog)
|
|
w.setWindowTitle("PyQt Dialog")
|
|
w.show()
|
|
sys.exit(app.exec_())
|
|
|
|
# This function should create a dialog window with a button
|
|
# that waits to be clicked and then exits the program
|
|
def showdialog():
|
|
d = QDialog()
|
|
b1 = QPushButton("ok", d)
|
|
b1.move(50, 50)
|
|
d.setWindowTitle("Dialog")
|
|
# This modality tells the popup to block the parent whilst it's active
|
|
d.setWindowModality(Qt.ApplicationModal)
|
|
# On click I'd like the entire process to end
|
|
b1.clicked.connect(sys.exit)
|
|
d.exec_()
|
|
|
|
if __name__ == '__main__':
|
|
window()
|
|
```
|