PyQt5 - 高阶窗体美化

• [ 不改变pyuic5编译生成的初始化类内部逻辑 ]
• 窗体圆角
• 自定义最小化、最大化、退出按钮（取消边框）
• 鼠标控制窗体移动（取消边框）

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窗体圆角

#首先设置无边框，其次设置背景透明
#背景透明后，可以在整体后方添加一个有色Label标签
#对该有色标签进行QSS圆角化！

MainWindow.setWindowFlag(QtCore.Qt.FramelessWindowHint)
#MainWindow.setWindowOpacity(0.9)  # 设置窗口透明度
MainWindow.setAttribute(QtCore.Qt.WA_TranslucentBackground)  # 设置窗口背景透明

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 鼠标拖动窗口

鼠标或键盘事件的重写：
    【继承的窗体类中含有对应的鼠标/键盘事件，所以本类会对继承基类的鼠标/键盘事件进行覆盖】
为什么使用原有的pyuic5编译的文件加上if __name__ == "__main__"执行块不能够正常执行呢？
    if __name__ == "__main__":
        app = QtWidgets.QApplication(sys.argv)
        MainWindow = QMainWindow()
        ui = Ui_MainWindow()
        ui.setupUi(MainWindow)
        with open("./QSS/demo_0628.qss") as f:
            MainWindow.setStyleSheet(f.read())
        MainWindow.show()
        sys.exit(app.exec_())
    我们在初始化的类中对其鼠标事件函数进行了重写，
    但是在执行块中在调用类之前就使用原有的窗体类完成了实例（第三行代码处），
    所以重写的鼠标事件函数将不会对应到这里实例的窗体中；
    
    解决方法：
        1> 修改初始化类的结构（即修改pyuic5给我们初始化类的逻辑结构）
            直接使用初始化类.show进行显示，而不是在执行块中使用窗体实例进行显示
        2> 新增一个类，使用这个类完成执行块中实例的生成，再经由另一个类进行控件的初始化

class XX(QMainWindow):
    def __init__(self):
        super().__init__()
    # def keyPressEvent(self, event):
    #     print("12345")
    # def mousePressEvent(self,event):
    #     if event.button() == Qt.LeftButton:
    #         print("鼠标左键点击！")
    #         # print(event.pos().x(),event.pos().y())
    #     if event.button() == Qt.RightButton:
    #         print("鼠标右键点击！")
    def mousePressEvent(self, event):
        if event.button() == Qt.LeftButton:
            self.m_flag = True
            self.m_Position = event.globalPos() - self.pos()  # 获取鼠标相对窗口的位置
            event.accept()
            self.setCursor(QCursor(Qt.OpenHandCursor))  # 更改鼠标图标
    def mouseMoveEvent(self, QMouseEvent):
        if Qt.LeftButton and self.m_flag:
            self.move(QMouseEvent.globalPos() - self.m_Position)  # 更改窗口位置
            QMouseEvent.accept()
    def mouseReleaseEvent(self, QMouseEvent):
        self.m_flag = False
        self.setCursor(QCursor(Qt.ArrowCursor))


if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = XX()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    with open("./QSS/demo_0628.qss") as f:
        MainWindow.setStyleSheet(f.read())
    MainWindow.show()
    sys.exit(app.exec_())

原理：

#测试派生类同名函数的替代

class A:
    def __init__(self,user,password,sex='男'):
        self.user = user
        self.__password = password
        self.sex = sex
    def show(self):
        print(self.user,self.__password,self.sex,sep="\n")
    def __str__(self):
        return "[AAA]"
    __repr__ = __str__

class B(A):
    def __init__(self):
        A.__init__(self,password=123456,user=1)
    def show(self):
        print("OOXX'"+str(1234)+"'"+"OOXX")
        print('OOXX"'+str(1234)+'"'+'OOXX')
    def __str__(self):
        return "[BBB]"
    __repr__ = __str__

if __name__ == "__main__":
    b = B()
    print(b)

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完整测试源码

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'xxx.ui'
#
# Created by: PyQt5 UI code generator 5.12.2
#
# WARNING! All changes made in this file will be lost!

from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtCore import Qt
from PyQt5.QtWidgets import QMainWindow
from PyQt5.QtGui import QCursor
import sys


class Ui_MainWindow(QMainWindow):

    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(690, 480)
        MainWindow.setMinimumSize(QtCore.QSize(690, 480))
        MainWindow.setMaximumSize(QtCore.QSize(690, 480))
        MainWindow.setStyleSheet("background-color: rgb(255, 255, 255);")
        MainWindow.setWindowFlag(QtCore.Qt.FramelessWindowHint)
        MainWindow.setWindowOpacity(0.9)  # 设置窗口透明度
        MainWindow.setAttribute(QtCore.Qt.WA_TranslucentBackground)  # 设置窗口背景透明

        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(200, 170, 261, 91))
        font = QtGui.QFont()
        font.setPointSize(14)
        font.setBold(True)
        font.setWeight(75)
        self.pushButton.setFont(font)
        self.pushButton.setStyleSheet("")
        self.pushButton.setObjectName("pushButton")
        self.min_button = QtWidgets.QPushButton(self.centralwidget)
        self.min_button.setGeometry(QtCore.QRect(20, 20, 21, 21))
        self.min_button.setAutoFillBackground(False)
        self.min_button.setStyleSheet("background-color: rgb(28, 255, 3);")
        self.min_button.setText("")
        self.min_button.setAutoDefault(False)
        self.min_button.setDefault(False)
        self.min_button.setFlat(False)
        self.min_button.setObjectName("min_button")
        self.max_button = QtWidgets.QPushButton(self.centralwidget)
        self.max_button.setGeometry(QtCore.QRect(50, 20, 21, 21))
        self.max_button.setStyleSheet("background-color: rgb(255, 243, 75);")
        self.max_button.setText("")
        self.max_button.setObjectName("max_button")
        self.close_button = QtWidgets.QPushButton(self.centralwidget)
        self.close_button.setGeometry(QtCore.QRect(80, 20, 21, 21))
        self.close_button.setStyleSheet("background-color: rgb(255, 12, 12);")
        self.close_button.setText("")
        self.close_button.setObjectName("close_button")

        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(0, 0, 671, 441))
        self.label.setAutoFillBackground(True)
        self.label.setStyleSheet("background-color: rgb(209, 255, 171);")
        self.label.setText("")
        self.label.setObjectName("label")

        self.label.raise_()
        self.pushButton.raise_()
        self.min_button.raise_()
        self.max_button.raise_()
        self.close_button.raise_()

        MainWindow.setCentralWidget(self.centralwidget)
        self.close_button.clicked.connect(MainWindow.close)
        self.min_button.clicked.connect(MainWindow.showMinimized)
        #self.max_button.clicked.connect(MainWindow.showMaximized)  因为窗口固定，放大功能暂时关闭

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.pushButton.setText(_translate("MainWindow", "->点击<-"))


class XX(QMainWindow):
    def __init__(self):
        super().__init__()
    # def keyPressEvent(self, event):
    #     print("12345")
    # def mousePressEvent(self,event):
    #     if event.button() == Qt.LeftButton:
    #         print("鼠标左键点击！")
    #         # print(event.pos().x(),event.pos().y())
    #     if event.button() == Qt.RightButton:
    #         print("鼠标右键点击！")
    def mousePressEvent(self, event):
        if event.button() == Qt.LeftButton:
            self.m_flag = True
            self.m_Position = event.globalPos() - self.pos()  # 获取鼠标相对窗口的位置
            event.accept()
            self.setCursor(QCursor(Qt.OpenHandCursor))  # 更改鼠标图标
    def mouseMoveEvent(self, QMouseEvent):
        if Qt.LeftButton and self.m_flag:
            self.move(QMouseEvent.globalPos() - self.m_Position)  # 更改窗口位置
            QMouseEvent.accept()
    def mouseReleaseEvent(self, QMouseEvent):
        self.m_flag = False
        self.setCursor(QCursor(Qt.ArrowCursor))


if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = XX()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    with open("./QSS/demo_0628.qss") as f:
        MainWindow.setStyleSheet(f.read())
    MainWindow.show()
    sys.exit(app.exec_())