如何使用 Span 格式从 QtableWidget 打印数据？

Question

我正在尝试从 QTableWidget 打印数据，它将跨度应用于几列。 Span 合并行以处理一对多关系。

问题：打印时忽略跨度格式。

class TableViewPage(QtWidgets.QMainWindow, Ui_table_MainWindow):
    def __init__(self, parent=None):
        super(TableViewPage, self).__init__(parent)
        self.setupUi(self)
        self.btn_load.clicked.connect(self.loadTable)
        self.btn_preview.clicked.connect(self.handlePreview)
        self.btn_print.clicked.connect(self.handlePrint)

        for row in range(self.tableWidget.rowCount()):
            for col in range(self.tableWidget.columnCount()):
                item = QtWidgets.QTableWidgetItem()
                item.setTextAlignment(QtCore.Qt.AlignCenter)
                self.tableWidget.setItem(row, col, item)
        self.tableWidget.setHorizontalHeaderLabels(
            'Party|Date|Product|Qty|Rate|Amt|Loading|Freight|Net|CD|Comm'.split('|'))

    def loadTable(self):
        connection = sqlite3.connect('main_databaseSample.db')
        connection.execute("DROP VIEW IF EXISTS myview;")
        query = "CREATE VIEW myview as SELECT dispatch_id, d_buyer," \
                "d_date, product, quantity, rate, d_amount, d_addFreight, d_subFreight, d_netAmount " \
                " from " \
                "dispatch, dispatch_products WHERE dispatch.id_dispatch = dispatch_products.dispatch_id " \
                "ORDER BY dispatch_id ASC;"
        connection.execute(query)
        query = "SELECT * FROM myview"
        result = connection.execute(query)
        last_id = -1
        start_row = 0
        for row, row_data in enumerate(result):
            self.tableWidget.insertRow(row)
            current_id, *other_values = row_data
            for col, data in enumerate(other_values):
                it = QtWidgets.QTableWidgetItem(str(data))
                self.tableWidget.setItem(row, col, it)
            if last_id != current_id and last_id != -1:
                self.apply_span(start_row, row - start_row)
                start_row = row
            last_id = current_id
        if start_row != row:
            self.apply_span(start_row, self.tableWidget.rowCount() - start_row)

    def apply_span(self, row, nrow):
        if nrow <= 1:
            return
        for c in (0, 1, 5, 6, 7, 8):
            self.tableWidget.setSpan(row, c, nrow, 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 = QtGui.QTextDocument()
        cursor = QtGui.QTextCursor(document)
        table = cursor.insertTable(
            self.tableWidget.rowCount(), self.tableWidget.columnCount())
        for row in range(table.rows()):
            for col in range(table.columns()):
                cursor.insertText(self.tableWidget.item(row, col).text())
                cursor.movePosition(QtGui.QTextCursor.NextCell)
        document.print_(printer)

样本数据：

dispatch table:
ID date   mill buyer addF subF amount cd comm netAmount
1  15-10  abc  A     0    0    100    0  0    100
2  16-10  xyz  B     0    0    200    0  0    200

dispatch_products table:
Dispatch_ID product qty rate
1           M       40  1
1           A       60  1
2           S       50  4

Code Output:
buyer date  product quantity rate amount addFreight subFreight NetAmount
A     15-10 M       40       1    100    0          0          100
A     15-10 A       60       1    100    0          0          100
B     16-10 S       50       4    200    0          0          200

Expected Output:
buyer date  product quantity rate amount addFreight subFreight NetAmount
A     15-10 M       40       1    100    0          0          100
            A       60       1                           
B     16-10 S       50       4    200    0          0          200

使用 apply_span 函数，我可以将表格显示为“预期输出”，但在打印数据时打印为“代码输出”格式。

更新：在打印列名时也会被忽略。

Answer 1

首先您必须检测跨度并添加它，但您可能会遇到问题，因为有些项目不可见但它们存在，因此一项任务是为此消除它们，向 apply_span () 添加更多代码.另一方面，必须为表头添加一个新行。

def apply_span(self, row, nrow):
    if nrow <= 1:
        return
    for c in (0, 1, 5, 6, 7, 8):
        self.tableWidget.setSpan(row, c, nrow, 1)
        # remove hidden items
        for r in range(row+1, row+nrow):
            t = self.tableWidget.takeItem(r, c)
            del t

@QtCore.pyqtSlot(QtPrintSupport.QPrinter)
def handlePaintRequest(self, printer):
    document = QtGui.QTextDocument()
    cursor = QtGui.QTextCursor(document)
    table = cursor.insertTable(self.tableWidget.rowCount()+1, self.tableWidget.columnCount())

    for c in range(table.columns()):
        it = self.tableWidget.horizontalHeaderItem(c)
        cursor.insertText(str(c) if it is None else it.text())
        cursor.movePosition(QtGui.QTextCursor.NextCell)

    for row in range(1, table.rows()):
        for col in range(table.columns()):
            it = self.tableWidget.item(row-1, col)
            cursor.insertText("" if it is None else it.text())
            cursor.movePosition(QtGui.QTextCursor.NextCell)

    for row in range(1, table.rows()):
        for col in range(table.columns()):
            table.mergeCells(row, col, self.tableWidget.rowSpan(row-1, col), 1)
    document.print_(printer)