Pyqt5 rapid development and practice 6.1 three dimensions of good software & 6.2 layout management in pyqt5 & 6.3 absolute location layout of pyqt5

PyQt5 Rapid development and actual combat

6. The first 6 Chapter PyQt5 Layout management

6.1 The three dimensions of good software

• It works

  This is the most basic and important measurement , It is mainly used to measure whether the product demand is reasonable , Is the right direction .

• Easy to use

  It mainly depends on whether the layout management architecture of the software is reasonable , Can you find what you want quickly , Whether the whole interaction process is clear , Whether the user gets stuck in the process of completing a task .

• To use

  A friendly 、 Humanized software interface , It will make users feel good about the software they use .

The importance of the three dimensions ： To use > Easy to use > It works

6.2 PyQt5 Layout management in

Layout management ： Absolute position and layout class .

layout ： Horizontal layout 、 Vertical layout 、 Grid layout 、 Form layout .

Layout method ：addLayout() 【 Insert sub layout in layout 】、 addWidget()【 Insert control in layout 】

The four layout methods correspond to four layout classes ：

• Horizontal layout class （QHBoxLayout), You can arrange the added controls in the horizontal direction .
• Vertical layout class （QVBoxLayout), You can arrange the added controls in the vertical direction .
• Grid layout class （QGridLayout), You can arrange the added controls in the form of a grid .
• Form layout class （QFormLayout), You can arrange the added controls in two columns .

6.3 PyQt5 Absolute position layout of

Absolute position layout (Absolute Positioning Layout） It is mainly realized by specifying the display coordinates and size of each control in the window program . The initial coordinates are in the upper left corner (0,0) The location of , With (0,0) Locate the specific position of a point in the window for the origin . The representation of display coordinates is (x,y),x Abscissa , Change from left to right ;y Ordinate , Change from top to bottom . In absolute position layout , The controls in the window are laid out in absolute positions .

import sys
from PyQt5.QtWidgets import QWidget , QLabel , QApplication

class Example(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        lb1 = QLabel(" Welcome ",self)
        lb1.move(15,10)

        lb1 = QLabel(" Ding Jiaxiong ", self)
        lb1.move(35, 40)

        lb1 = QLabel("！", self)
        lb1.move(55, 70)

        self.setGeometry(300 , 300 , 320 , 120)
        self.setWindowTitle(" Absolute position layout case ")

if __name__ == '__main__':

    from pyqt5_plugins.examples.exampleqmlitem import QtCore
    QtCore.QCoreApplication.setAttribute(QtCore.Qt.AA_EnableHighDpiScaling)
    app = QApplication(sys.argv)
    myWin = Example()
    myWin.show()
    sys.exit(app.exec_())

Advantages of absolute location layout ：

• You can directly locate the location of each control .

Disadvantages of absolute position layout ：

• If you change the size of a window , The size and position of controls in the window will not change .
• The generated windows may look different under different operating systems .
• Changing the font in the program may damage the layout .
• If you modify the layout , For example, add a new control , It must be completely rearranged , Cumbersome and time-consuming .