pyside2 widget界面去除边框后 添加放大 缩小 关闭按钮并可以鼠标拖动界面移动 界面自由伸缩的代码实现

以下是一个简单的示例代码，展示如何使用 PySide2 实现自由伸缩的界面，同时添加窗口控制按钮和鼠标拖动界面移动的功能。你可以根据自己的需求进行修改和扩展。

from PySide2.QtCore import Qt, QPoint
from PySide2.QtGui import QColor, QCursor
from PySide2.QtWidgets import QApplication, QMainWindow, QWidget, QHBoxLayout, QVBoxLayout, QFrame, QPushButton


class CustomTitleBar(QWidget):
    def __init__(self, parent=None):
        super(CustomTitleBar, self).__init__(parent)
        self.parent = parent

        self.setFixedHeight(30)
        self.setWindowTitle(self.parent.windowTitle())
        self.titlebar_layout = QHBoxLayout(self)
        self.titlebar_layout.setContentsMargins(0, 0, 0, 0)
        self.titlebar_layout.setSpacing(0)

        self.close_button = QPushButton('×', self)
        self.close_button.setFixedSize(30, 30)
        self.close_button.setStyleSheet("QPushButton { font-size: 16px; color: white; background-color: red; }"
                                         "QPushButton:hover { background-color: rgb(230, 0, 0); }"
                                         "QPushButton:pressed { background-color: rgb(180, 0, 0); }")
        self.close_button.clicked.connect(self.parent.close)
        self.titlebar_layout.addWidget(self.close_button)

        self.maximize_button = QPushButton('□', self)
        self.maximize_button.setFixedSize(30, 30)
        self.maximize_button.setStyleSheet("QPushButton { font-size: 16px; color: white; background-color: gray; }"
                                            "QPushButton:hover { background-color: rgb(180, 180, 180); }"
                                            "QPushButton:pressed { background-color: rgb(150, 150, 150); }")
        self.maximize_button.clicked.connect(self.toggle_maximize)
        self.titlebar_layout.addWidget(self.maximize_button)

        self.minimize_button = QPushButton('-', self)
        self.minimize_button.setFixedSize(30, 30)
        self.minimize_button.setStyleSheet("QPushButton { font-size: 16px; color: white; background-color: gray; }"
                                            "QPushButton:hover { background-color: rgb(180, 180, 180); }"
                                            "QPushButton:pressed { background-color: rgb(150, 150, 150); }")
        self.minimize_button.clicked.connect(self.parent.showMinimized)
        self.titlebar_layout.addWidget(self.minimize_button)

    def mousePressEvent(self, event):
        if event.button() == Qt.LeftButton:
            self.drag_pos = event.globalPos() - self.parent.pos()
            event.accept()

    def mouseMoveEvent(self, event):
        if event.buttons() & Qt.LeftButton:
            self.parent.move(event.globalPos() - self.drag_pos)
            event.accept()

    def toggle_maximize(self):
        if self.parent.isMaximized():
            self.parent.showNormal()
        else:
            self.parent.showMaximized()

    def update_title(self, title):
        self.setWindowTitle(title)


class CustomFrame(QFrame):
    def __init__(self, parent=None):
        super(CustomFrame, self).__init__(parent)
        self.setFrameShape(QFrame.StyledPanel)
        self.setFrameShadow(QFrame.Raised)
        self.setStyleSheet("background-color: white;")

    def mousePressEvent(self, event):
        if event.button() == Qt.LeftButton:
            self.drag_pos = event.globalPos() - self.parent().pos()
            event.accept()

    def mouseMoveEvent(self, event):
        if event.buttons() & Qt.LeftButton:
            self.parent().move(event.globalPos() - self.drag_pos)
            event.accept()


class CustomWindow(QMainWindow):
    def __init__(self):
        super(CustomWindow, self).__init__()
        self.setWindowFlags(Qt.FramelessWindowHint)
        self.setAttribute(Qt.WA_TranslucentBackground, True)
        self.setStyleSheet("background-color: rgba(255, 255, 255, 0.9);")

        self.title_bar = CustomTitleBar(self)
        self.setCentralWidget(CustomFrame(self))
        self.layout().setContentsMargins(0, 0, 0, 0)
        self.layout().addWidget(self.title_bar)

    def resizeEvent(self, event):
        super(CustomWindow, self).resizeEvent(event)
        self.title_bar.update_title(self.windowTitle())

    def mousePressEvent(self, event):
        if event.button() == Qt.LeftButton and event.pos().y() <= self.title_bar.height():
            self.drag_pos = event.globalPos() - self.pos()
            event.accept()

    def mouseMoveEvent(self, event):
        if event.buttons() & Qt.LeftButton and event.pos().y() <= self.title_bar.height():
            self.move(event.globalPos() - self.drag_pos)
            event.accept()

    def enterEvent(self, event):
        self.setCursor(QCursor(Qt.ArrowCursor))

    def leaveEvent(self, event):
        self.setCursor(QCursor(Qt.ArrowCursor))


if __name__ == '__main__':
    app = QApplication([])
    window = CustomWindow()
    window.show()
    app.exec_()

这段代码实现了以下功能：

- 去除窗口边框，并设置透明背景，实现无边框窗口效果；
- 添加窗口控制按钮（最大化、最小化、关闭）；
- 实现鼠标拖动窗口移动的功能；
- 界面自由伸缩。