PyQt5 QSpinBox – 如何获得给定宽度的首选高度

在本文中，我们将了解如何根据宽度获得旋转框的首选高度。高度取决于宽度意味着当宽度改变时高度也会改变。默认情况下，高度不取决于宽度。

注意：如果旋转框有布局，默认实现返回布局的首选高度。如果没有布局，默认实现返回-1，表示首选高度不依赖于宽度。

为了做到这一点，我们使用带有旋转框对象的heightForWidth方法。

Syntax : spin_box.heightForWidth(width)

Argument : It takes integer as 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(1, 999999)
  
        # setting prefix to spin
        self.spin.setPrefix("PREFIX ")
  
        # setting suffix to spin
        self.spin.setSuffix(" SUFFIX")
  
        # creating a label
        label = QLabel(self)
  
        # making the label multi line
        label.setWordWrap(True)
  
        # setting geometry to the label
        label.setGeometry(100, 200, 200, 60)
  
        # getting preferred height of the spin box with current width
        value = self.spin.heightForWidth(250)
  
        # setting text to the label
        label.setText("Preferred height " + str(value))
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())

输出 ：