"""The BrowserColumn widget displays the contents of a directory or file."""
from . import Widget
from .pager import Pager
from ranger import log
class BrowserColumn(Pager, Widget):
main_display = False
display_infostring = False
scroll_begin = 0
target = None
postpone_drawing = False
tagged_marker = '*'
old_dir = None
old_cf = None
def __init__(self, win, level):
Pager.__init__(self, win)
Widget.__init__(self, win)
self.level = level
def resize(self, y, x, hei, wid):
Widget.resize(self, y, x, hei, wid)
def click(self, event):
"""Handle a MouseEvent"""
from ranger.fsobject.fsobject import T_DIRECTORY
if not (event.pressed(1) or event.pressed(3)):
return False
if self.target is None:
pass
elif self.target.type is T_DIRECTORY:
index = self.scroll_begin + event.y - self.y
if event.pressed(1):
if not self.main_display:
self.fm.enter_dir(self.target.path)
if index < len(self.target):
self.fm.move_pointer(absolute = index)
elif event.pressed(3):
try:
clicked_file = self.target[index]
self.fm.enter_dir(clicked_file.path)
except:
pass
else:
if self.level > 0:
self.fm.move_right()
return True
def has_preview(self):
from ranger.fsobject.file import File
from ranger.fsobject.directory import Directory
if self.target is None:
return False
if isinstance(self.target, File):
if not self._preview_this_file(self.target):
return False
return True
def poke(self):
Widget.poke(self)
self.target = self.env.at_level(self.level)
def draw(self):
"""Call either _draw_file() or _draw_directory()"""
from ranger.fsobject.file import File
from ranger.fsobject.directory import Directory
if self.target != self.old_dir:
self.need_redraw = True
self.old_dir = self.target
if isinstance(self.target, Directory) \
and self.target.pointed_obj != self.old_cf:
self.need_redraw = True
self.old_cf = self.target.pointed_obj
if self.need_redraw:
self.win.erase()
if self.target is None:
pass
elif type(self.target) == File:
Pager.open(self)
self._draw_file()
elif type(self.target) == Directory:
self._draw_directory()
Widget.draw(self)
self.need_redraw = False
def _preview_this_file(self, target):
return target.document and not self.settings.preview_files
def _draw_file(self):
"""Draw a preview of the file, if the settings allow it"""
self.win.move(0, 0)
if not self.target.accessible:
self.win.addnstr("not accessible", self.wid)
Pager.close(self)
return
if not self._preview_this_file(self.target):
Pager.close(self)
return
try:
f = open(self.target.path, 'r')
except:
Pager.close(self)
else:
self.set_source(f)
Pager.draw(self)
def _draw_directory(self):
"""Draw the contents of a directory"""
from ranger.fsobject.directory import Directory
import stat
base_color = ['in_display']
self.target.use()
self.win.move(0, 0)
if not self.target.load_content_if_outdated():
self.target.sort_if_outdated()
if not self.target.content_loaded:
maxdirsize = self.settings.max_dirsize_for_autopreview
if not self.target.force_load and maxdirsize is not None \
and self.target.accessible \
and self.target.size > maxdirsize:
self.color(base_color, 'error')
self.win.addnstr("no preview", self.wid)
self.color_reset()
return
if self.settings.auto_load_preview:
self.color(base_color)
self.win.addnstr("...", self.wid)
self.postpone_drawing = True
self.color_reset()
return
else:
self.color(base_color, 'error')
self.win.addnstr("not loaded", self.wid)
self.color_reset()
return
if self.main_display:
base_color.append('maindisplay')
if not self.target.accessible:
self.color(base_color, 'error')
self.win.addnstr("not accessible", self.wid)
self.color_reset()
return
if self.target.empty():
self.color(base_color, 'empty')
self.win.addnstr("empty", self.wid)
self.color_reset()
return
self._set_scroll_begin()
selected_i = self.target.pointer
for line in range(self.hei):
i = line + self.scroll_begin
try:
drawed = self.target[i]
except IndexError:
break
this_color = base_color + list(drawed.mimetype_tuple)
text = drawed.basename
tagged = drawed.realpath in self.fm.tags
if i == selected_i:
this_color.append('selected')
if drawed.marked:
this_color.append('marked')
if tagged:
this_color.append('tagged')
if self.main_display:
text = self.tagged_marker + text
if isinstance(drawed, Directory):
this_color.append('directory')
else:
this_color.append('file')
if drawed.stat is not None and drawed.stat.st_mode & stat.S_IXUSR:
this_color.append('executable')
if drawed.islink:
this_color.append('link')
this_color.append(drawed.exists and 'good' or 'bad')
string = drawed.basename
try:
if self.main_display:
if tagged:
self.win.addnstr(line, 0, text, self.wid - 2)
elif self.wid > 1:
self.win.addnstr(line, 1, text, self.wid - 2)
else:
self.win.addnstr(line, 0, text, self.wid)
if self.display_infostring and drawed.infostring:
info = drawed.infostring
x = self.wid - 1 - len(info)
if x > self.x:
self.win.addstr(line, x, str(info) + ' ')
except:
# the drawing of the last string will cause an error
# because ncurses tries to move out of the bounds
pass
self.color_at(line, 0, self.wid, this_color)
if self.main_display and tagged and self.wid > 2:
this_color.append('tag_marker')
self.color_at(line, 0, len(self.tagged_marker), this_color)
self.color_reset()
def _get_scroll_begin(self):
"""Determines scroll_begin (the position of the first displayed file)"""
offset = self.settings.scroll_offset
dirsize = len(self.target)
winsize = self.hei
halfwinsize = winsize // 2
index = self.target.pointer or 0
original = self.target.scroll_begin
projected = index - original
upper_limit = winsize - 1 - offset
lower_limit = offset
if original < 0:
return 0
if dirsize < winsize:
return 0
if halfwinsize < offset:
return min( dirsize - winsize, max( 0, index - halfwinsize ))
if original > dirsize - winsize:
self.target.scroll_begin = dirsize - winsize
return self._get_scroll_begin()
if projected < upper_limit and projected > lower_limit:
return original
if projected > upper_limit:
return min( dirsize - winsize,
original + (projected - upper_limit))
if projected < upper_limit:
return max( 0,
original - (lower_limit - projected))
return original
def _set_scroll_begin(self):
"""Updates the scroll_begin value"""
self.scroll_begin = self._get_scroll_begin()
self.target.scroll_begin = self.scroll_begin
# TODO: does not work if options.scroll_offset is high,
# relative > 1 and you scroll from scroll_begin = 1 to 0
def scroll(self, relative):
"""scroll by n lines"""
self._set_scroll_begin()
old_value = self.target.scroll_begin
self.target.scroll_begin += relative
self._set_scroll_begin()
if self.target.scroll_begin == old_value:
self.target.move(relative = relative)
self.target.scroll_begin += relative
def __str__(self):
return self.__class__.__name__ + ' at level ' + str(self.level)