106 lines
3.4 KiB
Python
106 lines
3.4 KiB
Python
"""Single Gemini page curses management."""
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import curses
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from dataclasses import dataclass, field
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from bebop.gemtext import parse_gemtext
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from bebop.links import Links
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from bebop.rendering import generate_metalines, render_lines
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@dataclass
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class Page:
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"""Page-related data."""
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metalines: list = field(default_factory=list)
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links: Links = field(default_factory=Links)
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@staticmethod
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def from_gemtext(gemtext: str):
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"""Produce a Page from a Gemtext file or string."""
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elements = parse_gemtext(gemtext)
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metalines = generate_metalines(elements, 80)
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links = Links.from_metalines(metalines)
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return Page(metalines, links)
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class PagePad:
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"""Window containing page content."""
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MAX_COLS = 1000
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def __init__(self, initial_num_lines):
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self.dim = (initial_num_lines, PagePad.MAX_COLS)
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self.pad = curses.newpad(*self.dim)
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self.pad.scrollok(True)
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self.pad.idlok(True)
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self.current_line = 0
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self.current_column = 0
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self.current_page = None
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def show_page(self, page: Page):
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"""Render Gemtext data in the content pad."""
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self.current_page = page
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self.pad.clear()
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self.dim = render_lines(page.metalines, self.pad, PagePad.MAX_COLS)
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self.current_line = 0
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self.current_column = 0
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def refresh_content(self, x, y):
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"""Refresh content pad's view using the current line/column."""
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if x <= 0 or y <= 0:
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return
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content_position = self.current_line, self.current_column
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self.pad.refresh(*content_position, 0, 0, x, y)
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def scroll_v(self, num_lines: int, window_height: int =0):
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"""Make the content pad scroll up and down by num_lines.
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Arguments:
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- num_lines: amount of lines to scroll, can be negative to scroll up.
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- window_height: total window height, used to limit scrolling down.
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Returns:
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True if scrolling occured and the pad has to be refreshed.
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"""
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if num_lines < 0:
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num_lines = -num_lines
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min_line = 0
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if self.current_line > min_line:
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self.current_line = max(self.current_line - num_lines, min_line)
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return True
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else:
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max_line = self.dim[0] - window_height
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if self.current_line < max_line:
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self.current_line = min(self.current_line + num_lines, max_line)
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return True
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return False
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def scroll_h(self, num_columns: int, window_width: int =0):
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if num_columns < 0:
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num_columns = -num_columns
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min_column = 0
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if self.current_column > min_column:
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new_column = self.current_column - num_columns
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self.current_column = max(new_column, min_column)
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return True
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else:
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max_column = self.dim[1] - window_width
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if self.current_column < max_column:
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new_column = self.current_column + num_columns
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self.current_column = min(new_column, max_column)
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return True
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return False
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def go_to_beginning(self):
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if self.current_line:
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self.current_line = 0
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return True
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return False
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def go_to_end(self, window_height):
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max_line = self.dim[0] - window_height
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if self.current_line != max_line:
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self.current_line = max_line
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return True
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return False
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