def calculateScale(self, printer: QPrinter, painter: QPainter) -> float:
        """計(jì)算每毫米的邏輯單位"""

        # 獲取打印機(jī)的 DPI
        ppiPrinterX = printer.resolution()
        ppiPrinterY = ppiPrinterX  # 假設(shè) X 和 Y 方向的 DPI 相同

        # 獲取屏幕的 DPI
        screen = QApplication.primaryScreen()
        ppiScreenX = screen.logicalDotsPerInchX()
        ppiScreenY = screen.logicalDotsPerInchY()

        # 計(jì)算縮放比例，
        self.logScale = logScale = float(ppiPrinterX) / float(ppiScreenX)

        # 可根據(jù) DPI 比例調(diào)整字體大小
        print(f"縮放比例: {logScale}")

        # 獲取頁面大小和繪制區(qū)域大小
        pageRect = printer.pageRect(QPrinter.Unit.DevicePixel)  # 頁面大?。ㄏ袼兀?
        paintRect = painter.viewport()  # 繪制區(qū)域大?。ㄏ袼兀?

        # 計(jì)算縮放比例
        scale = logScale * float(paintRect.width()) / float(pageRect.width())

        # 設(shè)置 QPainter 的縮放比例
        painter.scale(scale, scale)

        # 計(jì)算每毫米的邏輯單位
        logUnitsMM = float(ppiPrinterX) / (logScale * 25.4)
        print(f"每毫米的邏輯單位: {logUnitsMM}")
        return logUnitsMM

def print_preview(self, setting: PrintSetting) -> None:
        """打印預(yù)覽"""

        # print(setting.__dict__)
        printer = QPrinter()  # QPrinter.PrinterMode.HighResolution

        # 打印的處理
        printer.setPageSize(setting.page_size)
        printer.setPageOrientation(setting.page_orientation)
        self.print_cols = setting.print_cols  # 打印指定列的索引列表
        self.print_title = setting.print_title  # 打印標(biāo)題
        self.settings = setting  # 保存打印設(shè)置

        preview_dialog = QPrintPreviewDialog(printer)
        <strong>preview_dialog.paintRequested.connect(self.print_preview_paint)</strong>
        preview_dialog.exec()

def print_preview_paint(self, printer: QPrinter) -> None:
        """打印預(yù)覽繪制"""
        self.painter = painter = QPainter(printer)

        # 計(jì)算每毫米的邏輯單位
        self.logUnitsMM = self.calculateScale(printer, painter)

        # 獲取頁面大小
        # unit 參數(shù)的可選值有：
        # QPrinter.Unit.Point：點(diǎn)（1 點(diǎn) = 1/72 英寸）
        # QPrinter.Unit.Millimeter：毫米（常用）
        # QPrinter.Unit.Inch：英寸
        # QPrinter.Unit.Pixel：像素

        # 獲取頁面的可打印區(qū)域
        page_rect = printer.pageRect(QPrinter.Unit.Millimeter)
        self.page_height = page_height = page_rect.height() * self.logUnitsMM
        self.page_width = page_width = page_rect.width() * self.logUnitsMM

# 分頁打印
        print(f"總行數(shù): {total_rows}, 總頁數(shù): {total_pages}")
        for page in range(total_pages):
            if page > 0:  # 非第一頁，需要換頁
                printer.newPage()
            self.print_page(page, rows_per_page, self.print_cols)

        self.painter.end()

index = 0  # 用來計(jì)算遞增的列數(shù)
        for col in range(self.columnCount()):
            if print_cols and col not in print_cols:
                continue
            header_text = self.GetColLabelValue(col)
            self.painter.drawText(
                int(x_offset + sum(col_widths[:index])),  # 累計(jì)不同的列寬
                y_offset,
                header_text,
            )
            index += 1

# 繪制表格內(nèi)容
        for row in range(
            page * rows_per_page, min((page + 1) * rows_per_page, self.total_rows)
        ):
            y_offset += self.row_height
            index = 0  # 用來計(jì)算遞增的列數(shù)
            for col in range(self.columnCount()):
                if print_cols and col not in print_cols:
                    continue
                # 獲取單元格數(shù)據(jù)
                text = self.GetValue(row, col)
                # 繪制單元格內(nèi)容
                self.painter.drawText(
                    int(x_offset + sum(col_widths[:index])),  # 累計(jì)不同的列寬
                    y_offset,
                    text,
                )
                index += 1