zoukankan      html  css  js  c++  java
  • An application icon

    The application icon is a small image which is usually displayed in the top left corner of the titlebar. In the following example we will show how we do it in PyQt4. We will also introduce some new methods.

    #!/usr/bin/python
    # -*- coding: utf-8 -*-
    
    """
    ZetCode PyQt4 tutorial 
    
    This example shows an icon
    in the titlebar of the window.
    
    author: Jan Bodnar
    website: zetcode.com 
    last edited: October 2011
    """
    
    import sys
    from PyQt4 import QtGui
    
    
    class Example(QtGui.QWidget):
        
        def __init__(self):
            super(Example, self).__init__()
            
            self.initUI()
            
            
        def initUI(self):
            
            self.setGeometry(300, 300, 250, 150)
            self.setWindowTitle('Icon')
            self.setWindowIcon(QtGui.QIcon('web.png'))        
        
            self.show()
            
            
    def main():
        
        app = QtGui.QApplication(sys.argv)
        ex = Example()
        sys.exit(app.exec_())
    
    
    if __name__ == '__main__':
        main()    
    

    The previous example was coded in a procedural style. Python programming language supports both procedural and object oriented programming styles. Programming in PyQt4 means programming in OOP.

    class Example(QtGui.QWidget):
        
        def __init__(self):
            super(Example, self).__init__()
            ...
    

    The three most important things in object oriented programming are classes, data, and methods. Here we create a new class called Example. The Example class inherits from QtGui.QWidget class. This means that we call two constructors: the first one for the Example class and the second one for the inherited class. The super() method returns the parent object of the Example class and we call its constructor. The __init__() method is a constructor method in Python.

    self.initUI() 
    

    The creation of the GUI is delegated to the initUI() method.

    self.setGeometry(300, 300, 250, 150)
    self.setWindowTitle('Icon')
    self.setWindowIcon(QtGui.QIcon('web.png'))  
    

    All three methods have been inherited from the QtGui.QWidget class. The setGeometry() does two things. It locates the window on the screen and sets its size. The first two parameters are the x and y positions of the window. The third is the width and the fourth is the height of the window. In fact, it combines the resize() and move() methods in one method. The last method sets the application icon. To do this, we have created a QtGui.QIcon object. The QtGui.QIcon receives the path to our icon to be displayed.

    def main():
        
        app = QtGui.QApplication(sys.argv)
        ex = Example()
        sys.exit(app.exec_())
    
    
    if __name__ == '__main__':
        main()   
    

    The startup code has been placed in the main() method. This is a Python idiom.

    IconFigure: Icon

  • 相关阅读:
    codevs 2149 矩形周长
    codevs 3044 矩形面积求并
    codevs 1293 送给圣诞夜的极光
    codevs 2806 红与黑
    codevs 1536 海战
    codevs 1262 不要把球传我
    codevs 2606 约数和问题
    BZOJ 2301 problem b
    BZOJ 3994 约数个数和
    codevs 1173 最优贸易
  • 原文地址:https://www.cnblogs.com/hushaojun/p/4434378.html
Copyright © 2011-2022 走看看