En este artículo, veremos cómo podemos hacer que los valores de string se repitan cuando el último valor lo alcance, debería volver al primer valor, de manera similar, cuando el valor disminuye después del primer valor, debería volver al último valor. Para hacer esto, tenemos que cambiar el código de clase personalizado de StringSpinBox.
A continuación se muestra el código para la clase personalizada StringSpinBox
# custom class for String Spin Box
class StringBox(QSpinBox):
# constructor
def __init__(self, parent=None):
super(StringBox, self).__init__(parent)
# list of strings
strings = ["a", "b", "c", "d", "e", "f", "g"]
# calling set Strings method with
# adding blank value in front and in end
self.setStrings(["BLANK"] + strings + ["BLANK"])
# show first value from index 1
self.setValue(1)
def reset_spin(self):
if self.value() == len(self.strings()) - 1:
self.setValue(0)
# 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]
# overwriting the stepBy method
# method that get called when values get incremented or decremented
def stepBy(self, step):
# checking if current value is 1 and step is -1
# step = -1 means decrement
if self.value() == 1 and step == -1:
# set current value to maximum
self.setValue(self.maximum())
# checking if current value is maximum -1 and step is 1
# step = 1 means Increment
elif self.value() == self.maximum() - 1 and step == 1:
# setting current value to 0
self.setValue(0)
# calling stepBy method of QSpinBox
QSpinBox.stepBy(self, step)
Explicación: dentro de la clase personalizada del cuadro de número de string, sobrescriba el método stepBy que se llama cuando se produce un incremento o una disminución allí, compruebe que si hay una disminución y el valor actual es mínimo, cambie su valor al máximo de manera similar si hay un incremento y actualmente es en el valor máximo, luego cambie su valor al valor mínimo -1.
A continuación se muestra la implementación.
# 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)
# list of strings
strings = ["a", "b", "c", "d", "e", "f", "g"]
# calling set Strings method with
# adding blank value in front and in end
self.setStrings(["BLANK"] + strings + ["BLANK"])
# show first value from index 1
self.setValue(1)
def reset_spin(self):
if self.value() == len(self.strings()) - 1:
self.setValue(0)
# 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]
# overwriting the stepBy method
# method that get called when values incremented
def stepBy(self, step):
# checking if current value is 1 and step is -1
# step = -1 means decrement
if self.value() == 1 and step == -1:
# set current value to maximum
self.setValue(self.maximum())
# checking if current value is maximum -1 and step is 1
# step = 1 means Increment
elif self.value() == self.maximum() - 1 and step == 1:
# setting current value to 0
self.setValue(0)
# calling stepBy method by QSpinBox
QSpinBox.stepBy(self, step)
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())
Producción :
Publicación traducida automáticamente
Artículo escrito por rakshitarora y traducido por Barcelona Geeks. The original can be accessed here. Licence: CCBY-SA