gaphas.painter.chain - Gaphas

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# Source code for gaphas.painter.chain

    from __future__ import annotations

    from collections.abc import Collection

    from cairo import Context as CairoContext

    from gaphas.item import Item
    from gaphas.painter.painter import Painter

    class PainterChain:
        """Chain up a set of painters."""

        def __init__(self) -> None:
            self._painters: list[Painter] = []

        def append(self, painter: Painter) -> PainterChain:
            """Add a painter to the list of painters."""
            self._painters.append(painter)
            return self

        def prepend(self, painter: Painter) -> PainterChain:
            """Add a painter to the beginning of the list of painters."""
            self._painters.insert(0, painter)
            return self

        def paint(self, items: Collection[Item], cairo: CairoContext) -> None:
            """See Painter.paint()."""
            for painter in self._painters:
                painter.paint(items, cairo)