Question

所以我试图拥有一个既可交互又透明的背景。我希望能够在屏幕上绘图。如下面的视频所示，如果我使用 self.background.fill(Qt.transparent)，背景不会像预期的那样透明，而是黑色。但是当我使用 self.setAttribute(Qt.WA_TranslucentBackground) 时，我根本无法绘制，它只是与它下面的窗口进行交互。如何制作一个透明的窗口，同时还能在上面绘图？

正如所见，self.setStyleSheet("background: transparent;") 也什么都不做。背景还是黑色的

https://streamable.com/pjro9e

这是我的代码：

import sys

from PyQt5.QtCore import QPoint, Qt
from PyQt5.QtGui import QPainter, QPen, QPixmap
from PyQt5.QtWidgets import QApplication, QMainWindow
from screeninfo import get_monitors


class Canvas(QMainWindow):

    def __init__(self):
        super().__init__()
        self.drawing = False
        self.lastPoint = QPoint()
        self.initUI()

    def initUI(self):
        monitor = get_monitors()[0]

        self.setStyleSheet("background: transparent;")
        self.background = QPixmap(monitor.width, monitor.height)
        self.background.fill(Qt.transparent)
        self.setGeometry(0, 0, 1920, 1080)
        self.resize(monitor.width, monitor.height)
        # self.setWindowOpacity(0.5)
        self.setWindowFlags(Qt.Window | Qt.CustomizeWindowHint | Qt.FramelessWindowHint | Qt.WindowStaysOnTopHint)
        self.setAttribute(Qt.WA_TranslucentBackground)

    def paintEvent(self, event):
        painter = QPainter(self)
        painter.drawPixmap(self.rect(), self.background)

    def mousePressEvent(self, event):
        if event.button() == Qt.LeftButton:
            self.drawing = True
            self.lastPoint = event.pos()

    def mouseMoveEvent(self, event):
        if event.buttons() and Qt.LeftButton and self.drawing:
            painter = QPainter(self.background)
            painter.setPen(QPen(Qt.magenta, 5, Qt.SolidLine, Qt.RoundCap, Qt.RoundJoin))
            # print(self.lastPoint, event.pos())
            painter.drawLine(self.lastPoint, event.pos())
            self.lastPoint = event.pos()
            self.update()

    def mouseReleaseEvent(self, event):
        if event.button == Qt.LeftButton:
            self.drawing = False


if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = Canvas()
    window.show()
    sys.exit(app.exec_())

Answer 1

您可以将 self.setStyleSheet('background:transparent) 替换为 self.setStyleSheet('background-color:transparent)。

Pyqt5 透明背景但也可交互

1 个答案: