Hello Experts!! I hope you are having great day. I am new in GUI programming specially PyQt5. I am practicing on simple GUI invoice application. In this application, I successfully generated the Invoice By QTextDocument. Now i want to add print dialogue and print preview option. I am having trouble in the code. This is saying
AttributeError: 'InvoiceForm' object has no attribute 'printpreviewDialog
As i am new, i am little bit confused in there. Could you please fix the code? That will help me a lot to study. Many Many Thanks. The code has given below:-
import sys
from PyQt5.QtCore import pyqtSignal, QSize, QSizeF, QDate
from PyQt5.QtGui import QTextDocument, QTextCursor, QFont
from PyQt5.QtPrintSupport import QPrinter, QPrintPreviewDialog
from PyQt5.QtWidgets import QWidget, QFormLayout, QLineEdit, QPlainTextEdit, QSpinBox, QDateEdit, QTableWidget, \
QHeaderView, QPushButton, QHBoxLayout, QTextEdit, QApplication, QMainWindow
font= QFont('Arial',16)
class InvoiceForm(QWidget):
submitted = pyqtSignal(dict)
def __init__(self):
super().__init__()
self.setLayout(QFormLayout())
self.inputs = dict()
self.inputs['Customer Name'] = QLineEdit()
self.inputs['Customer Address'] = QPlainTextEdit()
self.inputs['Invoice Date'] = QDateEdit(date=QDate.currentDate(), calendarPopup=True)
self.inputs['Days until Due'] = QSpinBox()
for label, widget in self.inputs.items():
self.layout().addRow(label, widget)
self.line_items = QTableWidget(rowCount=10, columnCount=3)
self.line_items.setHorizontalHeaderLabels(['Job', 'Rate', 'Hours'])
self.line_items.horizontalHeader().setSectionResizeMode(QHeaderView.Stretch)
self.layout().addRow(self.line_items)
for row in range(self.line_items.rowCount()):
for col in range(self.line_items.columnCount()):
if col > 0:
w = QSpinBox()
self.line_items.setCellWidget(row, col, w)
submit = QPushButton('Create Invoice', clicked=self.on_submit)
print = QPushButton('Print Invoice', clicked=self.printpreviewDialog)
self.layout().addRow(submit,print)
def on_submit(self):
data = {'c_name': self.inputs['Customer Name'].text(),
'c_addr': self.inputs['Customer Address'].toPlainText(),
'i_date': self.inputs['Invoice Date'].date().toString(),
'i_due': self.inputs['Invoice Date'].date().addDays(self.inputs['Days until Due'].value()).toString(),
'i_terms': '{} days'.format(self.inputs['Days until Due'].value()),
'line_items': list()}
for row in range(self.line_items.rowCount()):
if not self.line_items.item(row, 0):
continue
job = self.line_items.item(row, 0).text()
rate = self.line_items.cellWidget(row, 1).value()
hours = self.line_items.cellWidget(row, 2).value()
total = rate * hours
row_data = [job, rate, hours, total]
if any(row_data):
data['line_items'].append(row_data)
data['total_due'] = sum(x[3] for x in data['line_items'])
self.submitted.emit(data)
# remove everything else in this function below this point
class InvoiceView(QTextEdit):
dpi = 72
doc_width = 8.5 * dpi
doc_height = 6 * dpi
def __init__(self):
super().__init__(readOnly=True)
self.setFixedSize(QSize(self.doc_width, self.doc_height))
def build_invoice(self, data):
document = QTextDocument()
self.setDocument(document)
document.setPageSize(QSizeF(self.doc_width, self.doc_height))
document.setDefaultFont(font)
cursor = QTextCursor(document)
cursor.insertText(f"Customer Name: {data['c_name']}\n")
cursor.insertText(f"Customer Address: {data['c_addr']}\n")
cursor.insertText(f"Date: {data['i_date']}\n")
cursor.insertText(f"Total Due: {data['total_due']}\n")
class MainWindow(QMainWindow):
def __init__(self):
super().__init__()
central = QWidget()
self.setCentralWidget(central)
layout = QHBoxLayout(central)
self.invoiceForm = InvoiceForm()
layout.addWidget(self.invoiceForm)
self.invoiceView = InvoiceView()
layout.addWidget(self.invoiceView)
# hide the widget right now...
self.invoiceView.setVisible(False)
self.invoiceForm.submitted.connect(self.showPreview)
def showPreview(self, data):
self.invoiceView.setVisible(True)
self.invoiceView.build_invoice(data)
def printpreviewDialog(self):
printer = QPrinter(QPrinter.HighResolution)
previewDialog = QPrintPreviewDialog(printer, self)
previewDialog.paintRequested.connect(self.printPreview)
previewDialog.exec_()
def printPreview(self, printer):
self.invoiceView.build_invoice.print_(printer)
def main():
app = QApplication(sys.argv)
window = MainWindow()
window.show()
app.exec_()
if __name__ == '__main__':
main()
The main problem is that self.printpreviewDialog is a member of MainWindow, not of InvoiceForm, so you should connect the clicked signal from the main window instead.
Also note that you tried to use self.invoiceView.build_invoice.print_(), but this wouldn't work as you are not calling build_invoice, and even if you did, that function doesn't return anything.
You should use the self.invoiceView.document() instead, but you must ensure that the data has been built before.
class InvoiceForm(QWidget):
submitted = pyqtSignal(dict)
def __init__(self):
# ...
submit = QPushButton('Create Invoice', clicked=self.on_submit)
# make the button a member of the instance instead of a local variable,
# so that we can connect from the main window instance
self.printButton = QPushButton('Print Invoice')
self.layout().addRow(submit, self.printButton)
# ...
class MainWindow(QMainWindow):
def __init__(self):
# ...
self.invoiceForm.printButton.clicked.connect(self.printpreviewDialog)
# ...
def printPreview(self, printer):
self.invoiceView.document().print_(printer)
Note: never, never use built-in functions and statements for variable names, like print.