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37 lines
1.2 KiB
Python
37 lines
1.2 KiB
Python
"""Shared PDF footer canvas: bottom-right `current / total` page counter."""
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from __future__ import annotations
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from reportlab.lib import colors
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from reportlab.pdfgen import canvas
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class NumberedCanvas(canvas.Canvas):
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"""Canvas that renders `N / total` footer on every page."""
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self._saved_page_states: list[dict] = []
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def showPage(self) -> None:
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self._saved_page_states.append(dict(self.__dict__))
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self._startPage()
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def save(self) -> None:
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total = len(self._saved_page_states)
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for state in self._saved_page_states:
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self.__dict__.update(state)
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self._draw_page_footer(total)
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super().showPage()
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super().save()
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def _draw_page_footer(self, total_pages: int) -> None:
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self.saveState()
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self.setFillColor(colors.HexColor("#BDBDBD"))
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self.setFont("Helvetica", 8)
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label = f"{self._pageNumber} / {total_pages}"
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x = self._pagesize[0] - 1.5 * 28.3465 # ~1.5 cm from right
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y = 0.9 * 28.3465 # ~0.9 cm from bottom
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self.drawRightString(x, y, label)
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self.restoreState()
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