QPushButton

PyQt5 : QPushButton widget .

As the name suggests the QPushButton is used to add a button on our PyQt5 GUI Window .

Button is used to call any function to perform some specific action .

A button is rectangular and usually displays a text label that describes its actions. Shortcuts can be specified for buttons.

In this blog you will learn how to create button , call a function using it and lots more .

So lets code :

# PyQt5 : Dynamic Coding
# creating button // QPushButton
from PyQt5.QtWidgets import QPushButton,QApplication,QMainWindow
from PyQt5.QtGui import *
import sys

class Example(QMainWindow):
    def __init__(self):
        super().__init__()

        self.setGeometry(200,300,300,200)
        self.setWindowTitle('Dynamic coding')

        button = QPushButton('Button 1',self)
        button.resize(100,50)
        button.move(110,50)


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

 

QPushButton creates the widget, the first argument is text on the button and the second is where to place it .

The move and resize method is used for changing the position and size of Button or any widget .

OUTPUT :

Adding icon on button :

# PyQt5 : Dynamic Coding
# adding icon on button
from PyQt5.QtWidgets import QPushButton,QApplication,QMainWindow
from PyQt5.QtGui import *
import sys

class Example(QMainWindow):
    def __init__(self):
        super().__init__()

        self.setGeometry(200,300,300,200)
        self.setWindowTitle('Dynamic coding')

        button = QPushButton('Button 1',self)
        button.setIcon(QIcon('sublime.jpg'))
        # gives a perfect size of any PyQt5 widget // sizeHint
        button.resize(button.sizeHint())
        button.move(110,50)


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

For adding icon on QPushButton we use a method setIcon and QIcon method of QtGui Class .

if you see the code we also use a szeHint method :

The sizeHint ( ) method returns a perfect size of any PyQt5 widget according to the content present on it .

OUTPUT :

Calling function through button :

# PyQt5 : Dynamic Coding
# calling function through button
from PyQt5.QtWidgets import QPushButton,QApplication,QMainWindow
from PyQt5.QtGui import *
import sys

class Example(QMainWindow):
    def __init__(self):
        super().__init__()

        self.setGeometry(200,300,300,200)
        self.setWindowTitle('Dynamic coding')

        self.button = QPushButton('Button 1',self)
        self.button.resize(self.button.sizeHint())
        self.button.move(110,50)
        # ...
        self.button.clicked.connect(self.function)

    def function(self):
        self.button.setText('Button is pressed')
        self.button.resize(self.button.sizeHint())


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

When a button is activated by a mouse, space bar, or keyboard shortcut, the button sends a clicked() signal.

Connect to this signal to perform the action of the button. Buttons also provide less-used signals, such as pressed() and released().

Note : you can also disable button by using command : setEnabled( False )

OUTPUT :

When the button is pressed the button text is changed to Button is pressed .










Setting tooltip  :




The method setToolTip shows the message when the user points the mouse on the button.







# PyQt5 : Dynamic Coding
# Adding tooltip
from PyQt5.QtWidgets import QPushButton,QApplication,QMainWindow
from PyQt5.QtGui import *
import sys

class Example(QMainWindow):
    def __init__(self):
        super().__init__()

        self.setGeometry(200,300,300,200)
        self.setWindowTitle('Dynamic coding')

        self.button = QPushButton('Button 1',self)
        # .. setting tooltip

        self.button.setToolTip('press on button')
        self.button.resize(self.button.sizeHint())
        self.button.move(110,50)
        # ...
        self.button.clicked.connect(self.function)

    def function(self):
        self.button.setText('Button is pressed')
        self.button.resize(self.button.sizeHint())


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

OUTPUT :

Applying stylesheet  :

# PyQt5 : Dynamic Coding
# changing color of button using stylesheet
from PyQt5.QtWidgets import QPushButton,QApplication,QMainWindow
from PyQt5.QtGui import *
import sys

class Example(QMainWindow):
    def __init__(self):
        super().__init__()

        self.setGeometry(200,300,300,200)
        self.setWindowTitle('Dynamic coding')

        self.button = QPushButton('Button 1',self)
        # .. setting tooltip
        self.button.setToolTip('press on button')
        # .. adding styles
        self.button.setStyleSheet("color:black;background-color:cyan;")
        self.button.resize(self.button.sizeHint())
        self.button.move(110,50)


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

OUTPUT :

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This blog is contributed by Yogesh singh .

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