77 lines
2.5 KiB
Python
77 lines
2.5 KiB
Python
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import curses
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from bebop.gemtext import parse_gemtext
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from bebop.rendering import format_elements, render_lines
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class Page:
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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, Page.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.metalines = []
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self.current_line = 0
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self.current_column = 0
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self.links = {}
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def show_gemtext(self, gemtext: bytes):
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"""Render Gemtext data in the content pad."""
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elements = parse_gemtext(gemtext)
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self.metalines = format_elements(elements, 80)
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self.links = {
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meta["link_id"]: meta["url"]
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for meta, _ in self.metalines
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if "link_id" in meta and "url" in meta
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}
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self.pad.clear()
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self.dim = render_lines(self.metalines, self.pad, Page.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 =None):
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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_left(self):
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if self.current_column > 0:
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self.current_column -= 1
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return True
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return False
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def scroll_right(self, window_width):
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if self.current_column < Page.MAX_COLS - window_width:
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self.current_column += 1
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return True
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return False
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