How to print with landscape orientation in PyQt5?

问题

How can I modify this code to print automatically with, or to set default settings to landscape orientation?

I'm new to PyQt5. Trying to make an app with printing function. I copy+pasted this code from the internet but it's default setting is portrait orientation. It would be important to print with landscape orientation automatically.

from PyQt5 import QtWidgets, QtCore, QtPrintSupport, QtGui

class Window(QtWidgets.QWidget):
    def __init__(self):
        QtWidgets.QWidget.__init__(self)
        self.setWindowTitle(self.tr('Document Printer'))
        self.table = QtWidgets.QTableWidget(200, 5, self)

        for row in range(self.table.rowCount()):
            for col in range(self.table.columnCount()):
                item = QtWidgets.QTableWidgetItem('(%d, %d)' % (row, col))
                item.setTextAlignment(QtCore.Qt.AlignCenter)
                self.table.setItem(row, col, item)
        self.table.setHorizontalHeaderLabels(
            'SKU #|NAME|DESCRIPTION|QUANTITY|PRICE'.split('|'))
        self.buttonPrint = QtWidgets.QPushButton('Print', self)
        self.buttonPrint.clicked.connect(self.handlePrint)
        self.buttonPreview = QtWidgets.QPushButton('Preview', self)
        self.buttonPreview.clicked.connect(self.handlePreview)
        layout = QtWidgets.QGridLayout(self)
        layout.addWidget(self.table, 0, 0, 1, 2)
        layout.addWidget(self.buttonPrint, 1, 0)
        layout.addWidget(self.buttonPreview, 1, 1)

    def handlePrint(self):
        dialog = QtPrintSupport.QPrintDialog()
        if dialog.exec_() == QtWidgets.QDialog.Accepted:
            self.handlePaintRequest(dialog.printer())

    def handlePreview(self):
        dialog = QtPrintSupport.QPrintPreviewDialog()
        dialog.paintRequested.connect(self.handlePaintRequest)

        dialog.exec_()

    def handlePaintRequest(self, printer):
        document = self.makeTableDocument()
        document.print_(printer)

    def makeTableDocument(self):
        document = QtGui.QTextDocument()
        cursor = QtGui.QTextCursor(document)
        rows = self.table.rowCount()
        columns = self.table.columnCount()
        table = cursor.insertTable(rows + 1, columns)
        format = table.format()
        format.setHeaderRowCount(1)
        table.setFormat(format)
        format = cursor.blockCharFormat()
        format.setFontWeight(QtGui.QFont.Bold)
        for column in range(columns):
            cursor.setCharFormat(format)
            cursor.insertText(
                self.table.horizontalHeaderItem(column).text())
            cursor.movePosition(QtGui.QTextCursor.NextCell)
        for row in range(rows):
            for column in range(columns):
                cursor.insertText(
                    self.table.item(row, column).text())
                cursor.movePosition(QtGui.QTextCursor.NextCell)
        return document

if __name__ == '__main__':

    import sys
    app = QtWidgets.QApplication(sys.argv)
    window = Window()
    window.resize(640, 480)
    window.show()
    sys.exit(app.exec_())

Do anyone have any idea? Or have a snippet of code to landscape printing in pyqt5? Thank You!

回答1:

QPrinter::Orientation

This enum type (not to be confused with Orientation) is used to specify each page's orientation.

Constant          Value      Description
QPrinter::Portrait  0   the page's height is greater than its width.
QPrinter::Landscape 1   the page's width is greater than its height.

from PyQt5 import QtWidgets, QtCore, QtPrintSupport, QtGui

class Window(QtWidgets.QWidget):
    def __init__(self):
        QtWidgets.QWidget.__init__(self)
        self.setWindowTitle(self.tr('Document Printer'))
        self.table = QtWidgets.QTableWidget(200, 5, self)

        for row in range(self.table.rowCount()):
            for col in range(self.table.columnCount()):
                item = QtWidgets.QTableWidgetItem('(%d, %d)' % (row, col))
                item.setTextAlignment(QtCore.Qt.AlignCenter)
                self.table.setItem(row, col, item)
        self.table.setHorizontalHeaderLabels(
            'SKU #|NAME|DESCRIPTION|QUANTITY|PRICE'.split('|'))
        self.buttonPrint = QtWidgets.QPushButton('Print', self)
        self.buttonPrint.clicked.connect(self.handlePrint)
        self.buttonPreview = QtWidgets.QPushButton('Preview', self)
        self.buttonPreview.clicked.connect(self.handlePreview)
        layout = QtWidgets.QGridLayout(self)
        layout.addWidget(self.table, 0, 0, 1, 2)
        layout.addWidget(self.buttonPrint, 1, 0)
        layout.addWidget(self.buttonPreview, 1, 1)

    def handlePrint(self):
        dialog = QtPrintSupport.QPrintDialog()
        if dialog.exec_() == QtWidgets.QDialog.Accepted:
            self.handlePaintRequest(dialog.printer())

    def handlePreview(self):
        dialog = QtPrintSupport.QPrintPreviewDialog()
        dialog.paintRequested.connect(self.handlePaintRequest)

        dialog.exec_()

    def handlePaintRequest(self, printer):

        print("printer --> ", printer.orientation())
        printer.setOrientation(QtPrintSupport.QPrinter.Landscape)     # <------------
        print("printer 2--> ", printer.orientation())

        document = self.makeTableDocument()
        document.print_(printer)

    def makeTableDocument(self):
        document = QtGui.QTextDocument()
        cursor = QtGui.QTextCursor(document)
        rows = self.table.rowCount()
        columns = self.table.columnCount()
        table = cursor.insertTable(rows + 1, columns)
        format = table.format()
        format.setHeaderRowCount(1)
        table.setFormat(format)
        format = cursor.blockCharFormat()
        format.setFontWeight(QtGui.QFont.Bold)
        for column in range(columns):
            cursor.setCharFormat(format)
            cursor.insertText(
                self.table.horizontalHeaderItem(column).text())
            cursor.movePosition(QtGui.QTextCursor.NextCell)
        for row in range(rows):
            for column in range(columns):
                cursor.insertText(
                    self.table.item(row, column).text())
                cursor.movePosition(QtGui.QTextCursor.NextCell)
        return document

if __name__ == '__main__':

    import sys
    app = QtWidgets.QApplication(sys.argv)
    window = Window()
    window.resize(640, 480)
    window.show()
    sys.exit(app.exec_())

来源：https://stackoverflow.com/questions/54600127/how-to-print-with-landscape-orientation-in-pyqt5