In this article we will see how we can create a timer application in PyQt5. A timer is a specialized type of clock used for measuring specific time intervals, for the given time we have to decrease the time until times become zero i.e counting downwards. 
GUI Implementation steps : 1. Create a push button to open pop up for getting time and set its geometry 2. Create label to show time and complete status 3. Set label geometry, font size and align its text to center 4. Create three push button for starting the timer, pausing the timer and for resetting the timer 5. Set the geometry of each button Back-end Implementation steps : 1. Create count variable and flag to know if counter is stopped or running 2. Add action to each button 3. Inside the get second button action get the value of second using input dialog box and make the flag false 4. Inside the start action make flag true but if count is zero make if false 5. Inside pause action make flag false 6. Inside the reset action make flag false, set count value to zero and set text to the label 7. Make a timer object which calls its method after every 100 milliseconds 8. Inside the timer action check for the flag then decrement the value of count and set text to the label
Below is the implementation
Python3
# importing librariesfrom PyQt5.QtWidgets import *from PyQt5 import QtCore, QtGuifrom PyQt5.QtGui import *from PyQt5.QtCore import *import sysclass Window(QMainWindow): def __init__(self): super().__init__() # setting title self.setWindowTitle("Python ") # setting geometry self.setGeometry(100, 100, 400, 600) # calling method self.UiComponents() # showing all the widgets self.show() # method for widgets def UiComponents(self): # variables # count variable self.count = 0 # start flag self.start = False # creating push button to get time in seconds button = QPushButton("Set time(s)", self) # setting geometry to the push button button.setGeometry(125, 100, 150, 50) # adding action to the button button.clicked.connect(self.get_seconds) # creating label to show the seconds self.label = QLabel("//TIMER//", self) # setting geometry of label self.label.setGeometry(100, 200, 200, 50) # setting border to the label self.label.setStyleSheet("border : 3px solid black") # setting font to the label self.label.setFont(QFont('Times', 15)) # setting alignment to the label self.label.setAlignment(Qt.AlignCenter) # creating start button start_button = QPushButton("Start", self) # setting geometry to the button start_button.setGeometry(125, 350, 150, 40) # adding action to the button start_button.clicked.connect(self.start_action) # creating pause button pause_button = QPushButton("Pause", self) # setting geometry to the button pause_button.setGeometry(125, 400, 150, 40) # adding action to the button pause_button.clicked.connect(self.pause_action) # creating reset button reset_button = QPushButton("Reset", self) # setting geometry to the button reset_button.setGeometry(125, 450, 150, 40) # adding action to the button reset_button.clicked.connect(self.reset_action) # creating a timer object timer = QTimer(self) # adding action to timer timer.timeout.connect(self.showTime) # update the timer every tenth second timer.start(100) # method called by timer def showTime(self): # checking if flag is true if self.start: # incrementing the counter self.count -= 1 # timer is completed if self.count == 0: # making flag false self.start = False # setting text to the label self.label.setText("Completed !!!! ") if self.start: # getting text from count text = str(self.count / 10) + " s" # showing text self.label.setText(text) # method called by the push button def get_seconds(self): # making flag false self.start = False # getting seconds and flag second, done = QInputDialog.getInt(self, 'Seconds', 'Enter Seconds:') # if flag is true if done: # changing the value of count self.count = second * 10 # setting text to the label self.label.setText(str(second)) def start_action(self): # making flag true self.start = True # count = 0 if self.count == 0: self.start = False def pause_action(self): # making flag false self.start = False def reset_action(self): # making flag false self.start = False # setting count value to 0 self.count = 0 # setting label text self.label.setText("//TIMER//")# create pyqt5 appApp = QApplication(sys.argv)# create the instance of our Windowwindow = Window()# start the appsys.exit(App.exec()) |
Output :
