PyQt5 QSpinBox – 获取前台角色

在本文中，我们将了解如何获取旋转框的前景角色，旋转框中的角色基本上有两种类型，一种是前景，另一种是背景。前景角色定义了用于绘制前景的小部件调色板中的颜色。如果没有为旋转框设置明确的前台角色，那么前台将是与后台角色形成对比的角色。

为了做到这一点，我们使用带有旋转框对象的foregroundRole方法。

Syntax : font_metrics.foregroundRole()

Argument : It takes no argument

Return : It returns ColorRole object

下面是实现

# importing libraries
from PyQt5.QtWidgets import * 
from PyQt5 import QtCore, QtGui
from PyQt5.QtGui import * 
from PyQt5.QtCore import * 
import sys
  
  
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 spin box
        self.spin = QSpinBox(self)
  
        # setting geometry to spin box
        self.spin.setGeometry(100, 100, 250, 40)
  
        # setting range to the spin box
        self.spin.setRange(1, 999999)
  
        # setting prefix to spin
        self.spin.setPrefix("PREFIX ")
  
        # setting suffix to spin
        self.spin.setSuffix(" SUFFIX")
  
        # setting under line to the font
        font = self.spin.font()
        font.setUnderline(True)
        self.spin.setFont(font)
  
        # creating a label
        label = QLabel(self)
  
        # making label multi line
        label.setWordWrap(True)
  
        # setting geometry to the label
        label.setGeometry(100, 200, 300, 60)
  
        # getting the foreground role object
        foreground = self.spin.foregroundRole()
  
        # setting text to the label
        label.setText(str(type(foreground)))
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())

输出 ：