python - 使用 PyQT 伪透明

Question

我想创建一个伪透明窗口，方法是使用 PyQt 截取窗口后面的内容的屏幕截图。以下代码截屏:

#!/usr/bin/python3

from PyQt4.QtGui import *

app = QApplication([])
widget = QWidget()
widget.setLayout(QVBoxLayout())
label = QLabel()
widget.layout().addWidget(label)

def shoot():
    geometry = widget.geometry()
    widget.hide()
    label.setPixmap(QPixmap.grabWindow(QApplication.desktop().winId(), x = geometry.x(), y = geometry.y(), height = geometry.height(), width = geometry.width())
    widget.show()

widget.layout().addWidget(QPushButton('Screenshot', clicked = shoot))
widget.show()
app.exec_()

但是尽管有 widget.hide()，窗口本身还是出现在屏幕截图上。我怎样才能避免这种情况？

Answer 1

这是我写的东西，基本上可以满足您的需求。它使用可调整大小的 Qt 窗口对其背后的任何内容进行屏幕截图。到目前为止，此脚本仅适用于 1 个屏幕。深入研究 QScreen 和 QApplication 可能会给您答案以使其可扩展。

import sys
import io
from PySide2.QtWidgets import QApplication, QWidget, QPushButton
from PySide2.QtCore import Qt, QBuffer
from PIL import Image


class Screenshooter(QWidget):
    def __init__(self, parent):
        super().__init__()
        self.parent = parent
        self.setAttribute(Qt.WA_TranslucentBackground, True)
        self.resize(640, 480)
        self.snapBtn = QPushButton("Capture", self)
        self.snapBtn.clicked.connect(self.take_screenshot)
        self.show()

    def take_screenshot(self):
        geometry = self.geometry()
        screen = self.parent.screenAt(self.pos())
        full_screenshot = screen.grabWindow(
            0,
            geometry.x(),
            geometry.y(),
            geometry.width(),
            geometry.height()
        )
        full_image = full_screenshot.toImage()
        buffer = QBuffer()
        buffer.open(QBuffer.ReadWrite)
        full_image.save(buffer, 'PNG')
        im = Image.open(io.BytesIO(buffer.data()))
        im.show()
        buffer.close()


if __name__ == "__main__":
    app = QApplication(sys.argv)
    widget = Screenshooter(app)
    sys.exit(app.exec_())