PyQt5_设置窗体背景透明和隐藏边框

 窗口置顶、透明、去边框：

self.setAttribute(Qt.WA_TranslucentBackground)  # 窗体背景透明
self.setWindowFlags(Qt.WindowStaysOnTopHint | Qt.FramelessWindowHint | Qt.Tool)  #窗口置顶，无边框，在任务栏不显示图标

边框没了鼠标拖不动了，重写鼠标事件用控件拖：

#重写移动事件
def mouseMoveEvent(self, e: QMouseEvent):
	if self._tracking:
		self._endPos = e.pos() - self._startPos
		self.move(self.pos() + self._endPos)

def mousePressEvent(self, e: QMouseEvent):
	if e.button() == Qt.LeftButton:
		self._startPos = QPoint(e.x(), e.y())
		self._tracking = True

def mouseReleaseEvent(self, e: QMouseEvent):
	if e.button() == Qt.LeftButton:
		self._tracking = False
		self._startPos = None
		self._endPos = None

完整： 

# -*- coding: utf-8 -*-
 
import PyQt5
 
import sys
import cv2

from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
from PyQt5.QtGui import *
 
from UI import Ui_MainWindow
 
class MyWindow(QMainWindow, Ui_MainWindow):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.setupUi(self)

        self.setAttribute(Qt.WA_TranslucentBackground)  # 窗体背景透明
        self.setWindowFlags(Qt.WindowStaysOnTopHint | Qt.FramelessWindowHint | Qt.Tool)  #窗口置顶，无边框，在任务栏不显示图标
 
    def mouseMoveEvent(self, e: QMouseEvent):  # 重写移动事件
        if self._tracking:
            self._endPos = e.pos() - self._startPos
            self.move(self.pos() + self._endPos)
 
    def mousePressEvent(self, e: QMouseEvent):
        if e.button() == Qt.LeftButton:
            self._startPos = QPoint(e.x(), e.y())
            self._tracking = True
 
    def mouseReleaseEvent(self, e: QMouseEvent):
        if e.button() == Qt.LeftButton:
            self._tracking = False
            self._startPos = None
            self._endPos = None

if __name__ == "__main__":
 app = QApplication(sys.argv)
 mainWindow = MyWindow()
 mainWindow.show()
 sys.exit(app.exec_())