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"""
The pager displays text and allows you to scroll inside it.
"""
from . import Widget
from ranger.container.commandlist import CommandList
from ranger.ext.move import move_between
class Pager(Widget):
source = None
source_is_stream = False
old_source = None
old_scroll_begin = 0
old_startx = 0
def __init__(self, win, embedded=False):
Widget.__init__(self, win)
self.embedded = embedded
self.scroll_begin = 0
self.startx = 0
self.lines = []
self.commandlist = CommandList()
if embedded:
keyfnc = self.settings.keys.initialize_embedded_pager_commands
else:
keyfnc = self.settings.keys.initialize_pager_commands
keyfnc(self.commandlist)
def open(self):
self.scroll_begin = 0
self.startx = 0
self.need_redraw = True
def close(self):
if self.source and self.source_is_stream:
self.source.close()
def draw(self):
if self.old_source != self.source:
self.old_source = self.source
self.need_redraw = True
if self.old_scroll_begin != self.scroll_begin or \
self.old_startx != self.startx:
self.old_startx = self.startx
self.old_scroll_begin = self.scroll_begin
self.need_redraw = True
if self.need_redraw:
self.win.erase()
line_gen = self._generate_lines(
starty=self.scroll_begin, startx=self.startx)
for line, i in zip(line_gen, range(self.hei)):
try:
self.addstr(i, 0, line)
except TypeError:
pass
self.need_redraw = False
def move(self, relative=0, absolute=None):
i = self.scroll_begin
if isinstance(absolute, int):
i = absolute
if isinstance(relative, int):
i += relative
length = len(self.lines) - self.hei - 1
if i >= length:
self._get_line(i+self.hei)
length = len(self.lines) - self.hei - 1
if i >= length:
i = length
if i < 0:
i = 0
self.scroll_begin = i
def move_horizontal(self, relative=0, absolute=None):
self.startx = move_between(
current=self.startx,
minimum=0,
maximum=999,
relative=relative,
absolute=absolute)
def press(self, key):
try:
tup = self.env.keybuffer.tuple_without_numbers()
if tup:
cmd = self.commandlist[tup]
else:
return
except KeyError:
self.env.key_clear()
else:
if hasattr(cmd, 'execute'):
cmd.execute_wrap(self)
self.env.key_clear()
def set_source(self, source, strip=False):
if self.source and self.source_is_stream:
self.source.close()
if isinstance(source, str):
self.source_is_stream = False
self.lines = source.split('\n')
elif hasattr(source, '__getitem__'):
self.source_is_stream = False
self.lines = source
elif hasattr(source, 'readline'):
self.source_is_stream = True
self.lines = []
else:
self.source = None
self.source_is_stream = False
return False
if not self.source_is_stream and strip:
self.lines = map(lambda x: x.strip(), self.lines)
self.source = source
return True
def click(self, event):
n = event.ctrl() and 1 or 3
if event.pressed(4):
self.move(relative = -n)
elif event.pressed(2) or event.key_invalid():
self.move(relative = n)
return True
def _get_line(self, n, attempt_to_read=True):
try:
return self.lines[n]
except (KeyError, IndexError):
if attempt_to_read and self.source_is_stream:
for l in self.source:
self.lines.append(l)
if len(self.lines) > n:
break
return self._get_line(n, attempt_to_read=False)
return ""
def _generate_lines(self, starty, startx):
i = starty
if not self.source:
raise StopIteration
while True:
try:
line = self._get_line(i).expandtabs(4)
line = line[startx:self.wid - 1 + startx].rstrip()
yield line
except IndexError:
raise StopIteration
i += 1
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