30 lines
1.1 KiB
Python
30 lines
1.1 KiB
Python
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"""Line-API scroll view for the continuous reader — renders only the rows
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actually visible on screen (via Widget.render_line), reading from the flat
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Strip list diora_tui.layout.build_layout() precomputed once. This is what
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keeps very large books responsive: nothing here scales with book size at
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paint time, only with viewport height.
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"""
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from __future__ import annotations
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from textual.geometry import Size
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from textual.scroll_view import ScrollView
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from textual.strip import Strip
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from .layout import BookLayout
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class ContinuousBookView(ScrollView):
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def __init__(self, book_layout: BookLayout) -> None:
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super().__init__()
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self.book_layout = book_layout
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self.virtual_size = Size(book_layout.width, book_layout.total_rows)
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def render_line(self, y: int) -> Strip:
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_scroll_x, scroll_y = self.scroll_offset
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row = scroll_y + y
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strips = self.book_layout.row_strips
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if row < 0 or row >= len(strips):
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return Strip.blank(self.size.width, self.rich_style)
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return strips[row].crop_extend(0, self.size.width, self.rich_style)
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