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"""
The pager displays text and allows you to scroll inside it.
"""
from ranger import log
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
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
def close(self):
if self.source and self.source_is_stream:
self.source.close()
def draw(self):
line_gen = self._generate_lines(
starty=self.scroll_begin, startx=self.startx)
for line, i in zip(line_gen, range(self.hei)):
y, x = self.y + i, self.x
try:
self.win.addstr(y, x, line)
except:
pass
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
log('before: ' + str(length))
if i >= length:
self._get_line(i+self.hei)
length = len(self.lines) - self.hei - 1
log('after: ' + str(length))
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):
if self.source and self.source_is_stream:
self.source.close()
if 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
self.source = source
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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