move_resize_window.py

from PySide6.QtWidgets import *
from PySide6.QtCore import *
from PySide6.QtGui import *


class CourseWidget(QWidget):

    def __init__(self):
        super().__init__()
        self.setWindowFlags(Qt.FramelessWindowHint | Qt.Tool)
        ly = QVBoxLayout(self)
        ly.setContentsMargins(0, 0, 0, 0)
        toolbar = QWidget()
        toolbar_ly = QHBoxLayout(toolbar)
        toolbar_ly.setContentsMargins(0, 0, 0, 0)
        toolbar_ly.addItem(QSpacerItem(40, 20, QSizePolicy.Expanding, QSizePolicy.Minimum))
        toolbar_ly.addWidget(QPushButton('⨉', maximumWidth=20, maximumHeight=20, clicked=self.close, flat=True))
        ly.addWidget(toolbar)
        ly.addItem(QSpacerItem(20, 40, QSizePolicy.Minimum, QSizePolicy.Expanding))
        ly.addWidget(QLabel('Left Mouse: MOVE  Middle Mouse: Resize'))

        self.isMove = False
        self.isResize = False
        self.currPos = self.startPos = 0
        self.curSize = self.size()
        self.resize(400, 300)

    def closeEvent(self, event: QCloseEvent) -> None:
        if QMessageBox.question(self, 'Close Widget', 'Exit?', QMessageBox.Yes|QMessageBox.Cancel) == QMessageBox.Yes:
            qApp.quit()
        else:
            event.ignore()

    def mouse_moved(self, event):
        if self.isMove:
            new = event.globalPosition()
            new_pos = new + self.currPos - self.startPos
            self.move(new_pos.x(), new_pos.y())
        elif self.isResize:
            new_pos = event.globalPosition() - self.startPos
            new_size = self.curSize + QSize(new_pos.x(), new_pos.y())
            self.resize(new_size.width(), new_size.height())

    def mousePressEvent(self, event):
        if event.button() == Qt.LeftButton:
            self.isMove = True
            self.startPos = event.globalPosition()
            self.currPos = self.pos()
        elif event.button() == Qt.MiddleButton:
            self.isResize = True
            self.curSize = self.size()
            self.startPos = event.globalPosition()
        else:
            self.isMove = False
            self.isResize = False
        QWidget.mousePressEvent(self, event)

    def mouseMoveEvent(self, event):
        self.mouse_moved(event)

    def mouseReleaseEvent(self, event):
        if event.button() == Qt.MiddleButton:
            self.isResize = False
        if event.button() == Qt.LeftButton:
            self.isMove = False
        QWidget.mouseReleaseEvent(self, event)


if __name__ == '__main__':
    qApp = QApplication()
    qApp.setQuitOnLastWindowClosed(True)
    window = CourseWidget()
    window.show()
    qApp.exec()