PyQt5 QSpinBox – 获取字体的下降

在本文中，我们将看到如何获得旋转框字体的下降，即文本。下降是从基线到字符延伸到的最低点的距离。在实践中，一些字体设计者打破了这个规则，例如在外来语言中容纳一个不寻常的字符，所以这个值可能（尽管很少见）太小了。

为了做到这一点，我们使用带有旋转框的 QFontMetrics 对象的descent方法。

Syntax : font_metrics.descent()

Argument : It takes no argument

Return : It returns integer

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(0, 999999)
  
        # setting prefix to spin
        self.spin.setPrefix("PREFIX ")
  
        # setting suffix to spin
        self.spin.setSuffix(" SUFFIX")
  
        # 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 font metrics
        f_metrics = self.spin.fontMetrics()
  
        # getting descent value
        descent = f_metrics.descent()
  
        # setting text to the label
        label.setText("Descent : " + str(descent))
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())

输出 ：