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# Copyright (C) 2011-2018 Patrick Totzke <patricktotzke@gmail.com>
# Copyright © 2018 Dylan Baker
# This file is released under the GNU GPL, version 3 or a later revision.
# For further details see the COPYING file
import asyncio
import enum
import logging
import urwid
from .buffer import Buffer
from ..settings.const import settings
from ..widgets.thread import MessageWidget, ThreadNode
from .. import commands
from ..db.errors import NonexistantObjectError
class _ThreadBufFocus(enum.Enum):
TREE = enum.auto()
MESSAGE = enum.auto()
class ThreadBuffer(Buffer):
"""displays a thread as a tree of messages."""
modename = 'thread'
# list of the widgets containing the message body
# indexed by its depth-first position in the thread tree
_msg_widgets = None
# widget showing the thread tree
_msgtree_widget = None
# decorations around the msgtree widget
_msgtree_deco = None
# WidgetPlaceholder that wraps currently displayed message
_cur_msg_holder = None
def __init__(self, thread):
"""
:param thread: thread to display
:type thread: :class:`~alot.db.Thread`
"""
self.thread = thread
self._indent_width = settings.get('thread_indent_replies')
attr = settings.get_theming_attribute('thread', 'frame')
attr_focus = settings.get_theming_attribute('thread', 'frame_focus')
# create the widgets composing the buffer
self._msgtree_widget = urwid.ListBox(urwid.SimpleFocusListWalker([]))
self._msgtree_deco = urwid.AttrMap(urwid.LineBox(self._msgtree_widget),
attr, attr_focus)
# initial placeholder has to be selectable
self._cur_msg_holder = urwid.WidgetPlaceholder(urwid.SelectableIcon(''))
cur_msg_deco = urwid.AttrMap(urwid.LineBox(self._cur_msg_holder),
attr, attr_focus)
self.body = urwid.Pile([
('weight', 0.5, self._msgtree_deco),
('weight', 0.5, cur_msg_deco),
])
urwid.connect_signal(self._msgtree_widget.body, "modified", self._update_cur_msg)
self.rebuild()
super().__init__()
def __str__(self):
return '[thread] %s (%d message%s)' % (self.thread.subject,
self.thread.total_messages,
's' * (self.thread.total_messages > 1))
@property
def _focus(self):
if self.body.focus_position == 0:
return _ThreadBufFocus.TREE
elif self.body.focus_position == 1:
return _ThreadBufFocus.MESSAGE
else:
raise ValueError('Invalid focus position: %s' % str(self.body.focus_position))
def _update_cur_msg(self):
pos = self._msgtree_widget.body.focus
if pos is not None and pos < len(self._msg_widgets):
logging.debug('displaying message %s ', pos)
self._cur_msg_holder.original_widget = self._msg_widgets[pos]
def translated_tags_str(self, intersection=False):
tags = self.thread.get_tags(intersection=intersection)
trans = [settings.get_tagstring_representation(tag)['translated']
for tag in tags]
return ' '.join(trans)
def get_info(self):
info = {}
info['subject'] = self.thread.subject
info['authors'] = self.thread.get_authors_string()
info['tid'] = self.thread.id
info['message_count'] = self.thread.total_messages
info['thread_tags'] = self.translated_tags_str()
info['intersection_tags'] = self.translated_tags_str(intersection=True)
return info
def rebuild(self):
self._msg_widgets = []
self._msgtree_widget.body.clear()
self._cur_msg_holder.original_widget = urwid.SolidFill()
try:
self.thread.refresh()
except NonexistantObjectError:
return
list_walker = self._msgtree_widget.body
for pos, msg in enumerate(self.thread.message_list):
msg_wgt = MessageWidget(msg)
wgt = ThreadNode(msg, self.thread, pos, self._indent_width)
self._msg_widgets.append(msg_wgt)
list_walker.append(wgt)
# the weight given to the thread-tree widget is proportional to the number of
# messages in it plus 1 (for surrounding decoration), up to the limit of
# 49 messages, when it is equal to the message body widget
tree_weight = min(0.01 * (len(self._msg_widgets) + 1), 0.5)
self.msgtree_weight = tree_weight
if len(self._msg_widgets) > 0:
self._cur_msg_holder.original_widget = self._msg_widgets[0]
@property
def msgtree_weight(self):
return self.body.contents[0][1][1]
@msgtree_weight.setter
def msgtree_weight(self, weight):
weight = min(1.0, max(weight, 0.0))
self.body.contents[0] = (self.body.contents[0][0], ('weight', weight))
self.body.contents[1] = (self.body.contents[1][0], ('weight', 1.0 - weight))
def get_selected_message_position(self):
"""Return position of focussed message in the thread tree."""
return self._msgtree_widget.focus_position
def get_selected_message_widget(self):
"""Return currently focused :class:`MessageWidget`."""
pos = self.get_selected_message_position()
return self._msg_widgets[pos]
def get_selected_message(self):
"""Return focussed :class:`~alot.db.message.Message`."""
return self.get_selected_message_widget().get_message()
def get_selected_attachment(self):
"""
If an attachment widget is currently in focus, return the associated
Attachment. Otherwise return None.
"""
if self._focus == _ThreadBufFocus.MESSAGE:
msg_wgt = self.get_selected_message_widget()
return msg_wgt.get_selected_attachment()
return None
def message_widgets(self):
"""
Iterate over all the message widgets in this buffer
"""
for w in self._msg_widgets:
yield w
def set_focus(self, pos):
"Set the focus in the underlying body widget."
logging.debug('setting focus to %s ', pos)
self._msgtree_widget.set_focus(pos)
def focus_first(self):
"""set focus to first message of thread"""
self.set_focus(0)
def focus_last(self):
self.set_focus(max(self.thread.total_messages - 1, 0))
def focus_selected_message(self):
"""focus the summary line of currently focused message"""
self.set_focus(self.get_selected_message_position())
def focus_parent(self):
"""move focus to parent of currently focused message"""
msg = self.get_selected_message()
if msg.parent:
self.set_focus(self.thread.message_list.index(msg.parent))
def focus_first_reply(self):
"""move focus to first reply to currently focused message"""
msg = self.get_selected_message()
if len(msg.replies) > 0:
new_focus = self.thread.message_list.index(msg.replies[0])
self.set_focus(new_focus)
def focus_last_reply(self):
"""move focus to last reply to currently focused message"""
msg = self.get_selected_message()
if len(msg.replies) > 0:
new_focus = self.thread.message_list.index(msg.replies[-1])
self.set_focus(new_focus)
def _focus_sibling(self, offset):
msg = self.get_selected_message()
siblings = msg.parent.replies if msg.depth > 0 else self.thread.toplevel_messages
self_idx = siblings.index(msg)
new_idx = self_idx + offset
if new_idx >= 0 and new_idx < len(siblings):
self.set_focus(self.thread.message_list.index(siblings[new_idx]))
def focus_next_sibling(self):
"""focus next sibling of currently focussed message in thread tree"""
self._focus_sibling(1)
def focus_prev_sibling(self):
"""
focus previous sibling of currently focussed message in thread tree
"""
self._focus_sibling(-1)
def focus_next(self):
"""focus next message in depth first order"""
next_focus = self.get_selected_message_position() + 1
if next_focus >= 0 and next_focus < self.thread.total_messages:
self.set_focus(next_focus)
def focus_prev(self):
"""focus previous message in depth first order"""
next_focus = self.get_selected_message_position() - 1
if next_focus >= 0 and next_focus < self.thread.total_messages:
self.set_focus(next_focus)
_DIR_NEXT = 0
_DIR_PREV = 1
_DIR_FIRST = 2
_DIR_LAST = 3
def _focus_property(self, prop, direction):
"""does a walk in the given direction and focuses the
first message that matches the given property"""
cur_pos = self.get_selected_message_position()
if direction == self._DIR_NEXT:
walk = range(cur_pos + 1, self.thread.total_messages)
elif direction == self._DIR_FIRST:
walk = range(0, self.thread.total_messages)
elif direction == self._DIR_PREV:
walk = reversed(range(0, cur_pos))
elif direction == self._DIR_LAST:
walk = reversed(range(0, self.thread.total_messages))
else:
raise ValueError('Invalid focus_propery direction: ' + str(direction))
for pos in walk:
if prop(self._msg_widgets[pos]):
self.set_focus(pos)
break
def focus_next_matching(self, querystring):
"""focus next matching message in depth first order"""
self._focus_property(lambda x: x.get_message().matches(querystring), self._DIR_NEXT)
def focus_prev_matching(self, querystring):
"""focus previous matching message in depth first order"""
self._focus_property(lambda x: x.get_message().matches(querystring), self._DIR_PREV)
def focus_first_matching(self, querystring):
"""focus first matching message in depth first order"""
self._focus_property(lambda x: x.get_message().matches(querystring), self._DIR_FIRST)
def focus_last_matching(self, querystring):
"""focus last matching message in depth first order"""
self._focus_property(lambda x: x.get_message().matches(querystring), self._DIR_LAST)
def focus_thread_widget(self):
"""set focus on the thread widget"""
logging.debug('setting focus to thread widget')
self.body.focus_position = 0
def focus_msg_widget(self):
"""set focus on the message widget"""
logging.debug('setting focus to message widget')
self.body.focus_position = 1
def focus_toggle(self):
if self._focus == _ThreadBufFocus.TREE:
self.focus_msg_widget()
else:
self.focus_thread_widget()
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