In this article we will see how we can create a spin box which have string values, by default the spin box contains only integer values. String Spin box is a spin box which have string values to select from the given string values.
In order to create a String Spin Box we have create a custom class which inherits the QSpinBox class, below is the String Spin Box class syntax
# custom class for String Spin Box
class StringBox(QSpinBox):
# constructor
def __init__(self, parent=None):
super(StringBox, self).__init__(parent)
# string values
strings = ["a", "b", "c", "d", "e", "f", "g"]
# calling setStrings method
self.setStrings(strings)
# method setString
# similar to set value method
def setStrings(self, strings):
# making strings list
strings = list(strings)
# making tuple from the string list
self._strings = tuple(strings)
# creating a dictionary
self._values = dict(zip(strings, range(len(strings))))
# setting range to it the spin box
self.setRange(0, len(strings)-1)
# overwriting the textFromValue method
def textFromValue(self, value):
# returning string from index
# _string = tuple
return self._strings[value]
Explanation : The basic idea of this class is that we create a custom class which inherits the spin box class that’s why it has all the abilities of normal spin box but instead of displaying integer it display the string value. We have created dictionary such that for each string it has a integer key and the range of spin box is the number of string values and with the help of overwriting the textFromValue method it shows string instead of the integer.
Below is the implementation
# importing libraries from PyQt5.QtWidgets import * from PyQt5 import QtCore, QtGui from PyQt5.QtGui import * from PyQt5.QtCore import * import sys # custom class for String Spin Box class StringBox(QSpinBox): # constructor def __init__(self, parent = None): super(StringBox, self).__init__(parent) # string values strings = ["a", "b", "c", "d", "e", "f", "g"] # calling setStrings method self.setStrings(strings) # method setString # similar to set value method def setStrings(self, strings): # making strings list strings = list(strings) # making tuple from the string list self._strings = tuple(strings) # creating a dictionary self._values = dict(zip(strings, range(len(strings)))) # setting range to it the spin box self.setRange(0, len(strings)-1) # overwriting the textFromValue method def textFromValue(self, value): # returning string from index # _string = tuple return self._strings[value] class Window(QMainWindow): def __init__(self): super().__init__() # setting title self.setWindowTitle("Python ") # setting geometry self.setGeometry(100, 100, 600, 400) # calling method self.UiComponents() # showing all the widgets self.show() # method for widgets def UiComponents(self): # creating a string spin box string_spin_box = StringBox(self) # setting geometry to the spin box string_spin_box.setGeometry(100, 100, 200, 40) # create pyqt5 app App = QApplication(sys.argv) # create the instance of our Window window = Window() # start the app sys.exit(App.exec()) |
Output :
