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qt_screenshot.py
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qt_screenshot.py
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"""A qt screenshot exporter."""
import os
try:
from PyQt5 import QtCore # type:ignore
from PyQt5.QtGui import QPageLayout, QPageSize # type:ignore
from PyQt5.QtWebEngineWidgets import QWebEngineSettings, QWebEngineView # type:ignore
from PyQt5.QtWidgets import QApplication # type:ignore
QT_INSTALLED = True
except ModuleNotFoundError:
QT_INSTALLED = False
if QT_INSTALLED:
APP = None
if not QApplication.instance():
APP = QApplication([])
class QtScreenshot(QWebEngineView):
"""A qt screenshot exporter."""
def __init__(self):
"""Initialize the exporter."""
super().__init__()
self.app = APP
def capture(self, url, output_file, paginate):
"""Capture the screenshot."""
self.output_file = output_file
self.paginate = paginate
self.load(QtCore.QUrl(url))
self.loadFinished.connect(self.on_loaded)
# Create hidden view without scrollbars
self.setAttribute(QtCore.Qt.WA_DontShowOnScreen)
self.page().settings().setAttribute(QWebEngineSettings.ShowScrollBars, False)
self.data = b""
if output_file.endswith(".pdf"):
self.export = self.export_pdf
def cleanup(*args):
"""Cleanup the app."""
self.app.quit() # type:ignore
self.get_data()
self.page().pdfPrintingFinished.connect(cleanup)
elif output_file.endswith(".png"):
self.export = self.export_png
else:
msg = f"Export file extension not supported: {output_file}"
raise RuntimeError(msg)
self.show()
self.app.exec() # type:ignore
def on_loaded(self):
"""Handle app load."""
self.size = self.page().contentsSize().toSize()
self.resize(self.size)
# Wait for resize
QtCore.QTimer.singleShot(1000, self.export)
def export_pdf(self):
"""Export to pdf."""
if self.paginate:
page_size = QPageSize(QPageSize.A4)
page_layout = QPageLayout(page_size, QPageLayout.Portrait, QtCore.QMarginsF())
else:
factor = 0.75
page_size = QPageSize(
QtCore.QSizeF(self.size.width() * factor, self.size.height() * factor),
QPageSize.Point,
)
page_layout = QPageLayout(page_size, QPageLayout.Portrait, QtCore.QMarginsF())
self.page().printToPdf(self.output_file, pageLayout=page_layout)
def export_png(self):
"""Export to png."""
self.grab().save(self.output_file, "PNG")
self.app.quit() # type:ignore
self.get_data()
def get_data(self):
"""Get output data."""
if os.path.exists(self.output_file):
with open(self.output_file, "rb") as f:
self.data = f.read()
os.unlink(self.output_file)