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Bebop/bebop/page.py

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import curses
from bebop.gemtext import parse_gemtext
from bebop.rendering import format_elements, render_lines
class Page:
"""Window containing page content."""
MAX_COLS = 1000
def __init__(self, initial_num_lines):
self.dim = (initial_num_lines, Page.MAX_COLS)
self.pad = curses.newpad(*self.dim)
self.pad.scrollok(True)
self.pad.idlok(True)
self.metalines = []
self.current_line = 0
self.current_column = 0
self.links = {}
def show_gemtext(self, gemtext: bytes):
"""Render Gemtext data in the content pad."""
elements = parse_gemtext(gemtext)
self.metalines = format_elements(elements, 80)
self.links = {
meta["link_id"]: meta["url"]
for meta, _ in self.metalines
if "link_id" in meta and "url" in meta
}
self.pad.clear()
self.dim = render_lines(self.metalines, self.pad, Page.MAX_COLS)
self.current_line = 0
self.current_column = 0
def refresh_content(self, x, y):
"""Refresh content pad's view using the current line/column."""
if x <= 0 or y <= 0:
return
content_position = self.current_line, self.current_column
self.pad.refresh(*content_position, 0, 0, x, y)
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def scroll_v(self, num_lines: int, window_height: int =0):
"""Make the content pad scroll up and down by num_lines.
Arguments:
- num_lines: amount of lines to scroll, can be negative to scroll up.
- window_height: total window height, used to limit scrolling down.
Returns:
True if scrolling occured and the pad has to be refreshed.
"""
if num_lines < 0:
num_lines = -num_lines
min_line = 0
if self.current_line > min_line:
self.current_line = max(self.current_line - num_lines, min_line)
return True
else:
max_line = self.dim[0] - window_height
if self.current_line < max_line:
self.current_line = min(self.current_line + num_lines, max_line)
return True
return False
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def scroll_h(self, num_columns: int, window_width: int =0):
if num_columns < 0:
num_columns = -num_columns
min_column = 0
if self.current_column > min_column:
new_column = self.current_column - num_columns
self.current_column = max(new_column, min_column)
return True
else:
max_column = self.dim[1] - window_width
if self.current_column < max_column:
new_column = self.current_column + num_columns
self.current_column = min(new_column, max_column)
return True
return False