[英]How do I create a print preview of QWebEngineView in PyQt5?
I'm trying to create a print preview of a QWebEngineView but I can't get it to work.我正在尝试创建 QWebEngineView 的打印预览,但我无法让它工作。
Here's my code:这是我的代码:
...
self.view = QWebEngineView()
...
def handle_preview(self):
dialog = QPrintPreviewDialog()
dialog.paintRequested.connect(self.view.print_)
dialog.exec_()
The code gives me this error:代码给了我这个错误:
AttributeError: 'QWebEngineView' object has no attribute 'print_' AttributeError: 'QWebEngineView' 对象没有属性 'print_'
The code works perfectly when I use QTextEdit.当我使用 QTextEdit 时,代码运行良好。 But that's not what I want.
但这不是我想要的。 I want to use QWebEngineView.
我想使用 QWebEngineView。
Based on the official example: WebEngine Widgets PrintMe Example you can implement the preview using the following code.基于官方示例: WebEngine Widgets PrintMe Example您可以使用以下代码实现预览。
from PyQt5.QtCore import (QCoreApplication, QEventLoop, QObject, QPointF, Qt,
QUrl, pyqtSlot)
from PyQt5.QtGui import QKeySequence, QPainter
from PyQt5.QtPrintSupport import QPrintDialog, QPrinter, QPrintPreviewDialog
from PyQt5.QtWebEngineWidgets import QWebEnginePage, QWebEngineView
from PyQt5.QtWidgets import QApplication, QDialog, QLabel, QProgressBar, QProgressDialog, QShortcut
class PrintHandler(QObject):
def __init__(self, parent = None):
super().__init__(parent)
self.m_page = None
self.m_inPrintPreview = False
def setPage(self, page):
assert not self.m_page
self.m_page = page
self.m_page.printRequested.connect(self.printPreview)
@pyqtSlot()
def print(self):
printer = QPrinter(QPrinter.HighResolution)
dialog = QPrintDialog(printer, self.m_page.view())
if dialog.exec_() != QDialog.Accepted:
return
self.printDocument(printer)
@pyqtSlot()
def printPreview(self):
if not self.m_page:
return
if self.m_inPrintPreview:
return
self.m_inPrintPreview = True
printer = QPrinter()
preview = QPrintPreviewDialog(printer, self.m_page.view())
preview.paintRequested.connect(self.printDocument)
preview.exec()
self.m_inPrintPreview = False
@pyqtSlot(QPrinter)
def printDocument(self, printer):
loop = QEventLoop()
result = False
def printPreview(success):
nonlocal result
result = success
loop.quit()
progressbar = QProgressDialog(self.m_page.view())
progressbar.findChild(QProgressBar).setTextVisible(False)
progressbar.setLabelText("Wait please...")
progressbar.setRange(0, 0)
progressbar.show()
progressbar.canceled.connect(loop.quit)
self.m_page.print(printer, printPreview)
loop.exec_()
progressbar.close()
if not result:
painter = QPainter()
if painter.begin(printer):
font = painter.font()
font.setPixelSize(20)
painter.setFont(font)
painter.drawText(QPointF(10, 25), "Could not generate print preview.")
painter.end()
def main():
import sys
QCoreApplication.setAttribute(Qt.AA_EnableHighDpiScaling)
app = QApplication(sys.argv)
app.setApplicationName("Previewer")
view = QWebEngineView()
view.setUrl(QUrl("https://stackoverflow.com/questions/59438021"))
view.resize(1024, 750)
view.show()
handler = PrintHandler()
handler.setPage(view.page())
printPreviewShortCut = QShortcut(QKeySequence(Qt.CTRL + Qt.Key_P), view)
printShortCut = QShortcut(QKeySequence(Qt.CTRL + Qt.SHIFT + Qt.Key_P), view)
printPreviewShortCut.activated.connect(handler.printPreview)
printShortCut.activated.connect(handler.print)
sys.exit(app.exec_())
if __name__ == "__main__":
main()
Note: For PySide2 you only have to change pyqtSlot
to Slot
.注意:对于 PySide2,您只需将
pyqtSlot
更改为Slot
。
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