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widgets.py
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widgets.py
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# Copyright (c) 2013-2016 Christian Geier et al.
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
"""A collection of (reusable) urwid widgets
Widgets that are specific to calendaring/khal should go into __init__.py or,
if they are large, into their own files
"""
from datetime import date, datetime, timedelta
import re
import urwid
class DateConversionError(Exception):
pass
def delete_last_word(text, number=1):
"""delete last `number` of words from text"""
words = re.findall(r"[\w]+|[^\w\s]", text, re.UNICODE)
for one in range(1, number + 1):
text = text.rstrip()
if text == '':
return text
text = text[:len(text) - len(words[-one])]
return text
def delete_till_beginning_of_line(text):
"""delete till beginning of line"""
if text.rfind("\n") == -1:
return ''
return text[0:text.rfind("\n") + 1]
def delete_till_end_of_line(text):
"""delete till beginning of line"""
if text.find("\n") == -1:
return ''
return text[text.find("\n"):]
def goto_beginning_of_line(text):
if text.rfind("\n") == -1:
return 0
return text.rfind("\n") + 1
def goto_end_of_line(text):
if text.find("\n") == -1:
return len(text)
return text.find("\n")
class ExtendedEdit(urwid.Edit):
"""A text editing widget supporting some more editing commands"""
def keypress(self, size, key):
if key == 'ctrl w':
self._delete_word()
elif key == 'ctrl u':
self._delete_till_beginning_of_line()
elif key == 'ctrl k':
self._delete_till_end_of_line()
elif key == 'ctrl a':
self._goto_beginning_of_line()
elif key == 'ctrl e':
self._goto_end_of_line()
else:
return super(ExtendedEdit, self).keypress(size, key)
def _delete_word(self):
"""delete word before cursor"""
text = self.get_edit_text()
f_text = delete_last_word(text[:self.edit_pos])
self.set_edit_text(f_text + text[self.edit_pos:])
self.set_edit_pos(len(f_text))
def _delete_till_beginning_of_line(self):
"""delete till start of line before cursor"""
text = self.get_edit_text()
f_text = delete_till_beginning_of_line(text[:self.edit_pos])
self.set_edit_text(f_text + text[self.edit_pos:])
self.set_edit_pos(len(f_text))
def _delete_till_end_of_line(self):
"""delete till end of line before cursor"""
text = self.get_edit_text()
f_text = delete_till_end_of_line(text[self.edit_pos:])
self.set_edit_text(text[:self.edit_pos] + f_text)
def _goto_beginning_of_line(self):
text = self.get_edit_text()
self.set_edit_pos(goto_beginning_of_line(text[:self.edit_pos]))
def _goto_end_of_line(self):
text = self.get_edit_text()
self.set_edit_pos(goto_end_of_line(text[self.edit_pos:]) + self.edit_pos)
class EnterEdit(ExtendedEdit):
"""Edit class that emits signal `enter` if user tries to edit"""
signals = ['enter']
def keypress(self, size, key):
if key not in ['up', 'down', 'left', 'right', 'tab', 'shift tab']:
self._emit('enter')
return
else:
return super().keypress(size, key)
class DateTimeWidget(ExtendedEdit):
def __init__(self, dateformat, on_date_change=lambda x: None, **kwargs):
self.dateformat = dateformat
self.on_date_change = on_date_change
super().__init__(wrap='any', **kwargs)
def keypress(self, size, key):
if key == 'ctrl x':
self.decrease()
return None
elif key == 'ctrl a':
self.increase()
return None
if (
key in ['up', 'down', 'tab', 'shift tab'] or
(key in ['right'] and self.edit_pos >= len(self.edit_text)) or
(key in ['left'] and self.edit_pos == 0)):
# when leaving the current Widget we check if currently
# entered value is valid and if so pass the new value
try:
new_date = self._get_current_value()
except DateConversionError:
pass
else:
self.on_date_change(new_date)
return super(DateTimeWidget, self).keypress(size, key)
def increase(self):
"""call to increase the datefield by self.timedelta"""
self._crease(self.dtype.__add__)
def decrease(self):
"""call to decrease the datefield by self.timedelta"""
self._crease(self.dtype.__sub__)
def _crease(self, fun):
"""common implementation for `self.increase` and `self.decrease`"""
try:
new_date = fun(self._get_current_value(), self.timedelta)
self.on_date_change(new_date)
self.set_edit_text(new_date.strftime(self.dateformat))
except DateConversionError:
pass
def set_value(self, new_date):
"""set a new value for this widget
:type new_date: datetime.date
"""
self.set_edit_text(new_date.strftime(self.dateformat))
class DateWidget(DateTimeWidget):
dtype = date
timedelta = timedelta(days=1)
def _get_current_value(self):
try:
new_date = datetime.strptime(self.get_edit_text(), self.dateformat).date()
except ValueError:
raise DateConversionError
else:
return new_date
class TimeWidget(DateTimeWidget):
dtype = datetime
timedelta = timedelta(minutes=15)
def _get_current_value(self):
try:
new_datetime = datetime.strptime(self.get_edit_text(), self.dateformat)
except ValueError:
raise DateConversionError
else:
return new_datetime
class Choice(urwid.PopUpLauncher):
def __init__(self, choices, active, decorate_func=None, win_len=None,
overlay_width=32):
self.choices = choices
self._win_len = win_len
self._decorate = decorate_func or (lambda x: x)
self._overlay_width = overlay_width
self.active = self._original = active
def create_pop_up(self):
pop_up = ChoiceList(self)
urwid.connect_signal(pop_up, 'close', lambda button: self.close_pop_up())
return pop_up
@property
def win_len(self):
if self._win_len:
return self._win_len
else:
return len(self.choices)
def get_pop_up_parameters(self):
return {'left': 0,
'top': 1,
'overlay_width': self._overlay_width,
'overlay_height': self.win_len}
@property
def changed(self):
return self._active != self._original
@property
def active(self):
return self._active
@active.setter
def active(self, val):
self._active = val
self.button = urwid.Button(self._decorate(self._active))
urwid.PopUpLauncher.__init__(self, self.button)
urwid.connect_signal(self.button, 'click',
lambda button: self.open_pop_up())
class EditSelect(Choice):
def create_pop_up(self):
pop_up = ChoiceListEdit(self)
urwid.connect_signal(pop_up, 'close', lambda button: self.close_pop_up())
return pop_up
@property
def active(self):
return self._active
@active.setter
def active(self, val):
self._active = val
self.button = EnterEdit('', self._decorate(self._active))
urwid.PopUpLauncher.__init__(self, self.button)
urwid.connect_signal(self.button, 'enter', lambda button: self.open_pop_up())
class ChoiceList(urwid.WidgetWrap):
"""A pile of Button() widgets, intended to be used with Choice()"""
signals = ['close']
def __init__(self, parent):
self.parent = parent
buttons = []
for c in parent.choices:
buttons.append(
urwid.Button(parent._decorate(c),
on_press=self.set_choice, user_data=c)
)
pile = NPile(buttons, outermost=True)
num = [num for num, elem in enumerate(parent.choices) if elem == parent.active][0]
pile.set_focus(num)
fill = urwid.Filler(pile)
urwid.WidgetWrap.__init__(self, urwid.AttrMap(fill, 'popupbg'))
def set_choice(self, button, account):
self.parent.active = account
self._emit('close')
def keypress(self, size, key):
if key == 'esc':
self._emit('close')
return
else:
return super().keypress(size, key)
class ChoiceListEdit(ChoiceList):
"""
+------------------+
| Edit self._edit | Both Elements are wrapped in an NPile,
+------------------+ one can jump from Edit to the Walker with tab
| ListWalker | and back with shift tab
| self._walker |
| over | When Edit is updated, only choices containing the
| allowed | Edit.text are displayed
| choices |
+------------------+
"""
def __init__(self, parent):
self.parent = parent
self._edit = ExtendedEdit('', parent.active)
urwid.connect_signal(self._edit, 'change',
lambda edit, text: self.filter(text))
self._walker = urwid.SimpleFocusListWalker([self._edit])
walker = urwid.BoxAdapter(
urwid.ListBox(self._walker), height=self.parent.win_len - 1)
self._pile = NPile([self._edit, walker], outermost=True)
self.filter('')
self.focus_on(self.parent.active)
fill = urwid.Filler(self._pile, 'top')
urwid.WidgetWrap.__init__(self, urwid.AttrMap(fill, 'popupbg'))
def focus_on(self, text):
for num, widget in enumerate(self._walker):
if widget.label == text:
self._walker.set_focus(num)
return
def filter(self, text):
buttons = [self._edit]
buttons = list()
text = text.lower()
for c in self.parent.choices:
if text in c.lower():
buttons.append(
urwid.Button(self.parent._decorate(c),
on_press=self.set_choice, user_data=c)
)
if not buttons:
buttons = [urwid.Text('no match')]
self._walker.clear()
self._walker.extend(buttons)
class SupportsNext(object):
"""classes inheriting from SupportsNext must implement the following methods:
_select_first_selectable
_select_last_selectable
"""
def __init__(self, *args, **kwargs):
self.outermost = kwargs.get('outermost', False)
if 'outermost' in kwargs:
kwargs.pop('outermost')
super(SupportsNext, self).__init__(*args, **kwargs)
class NextMixin(SupportsNext):
"""Implements SupportsNext for urwid.Pile and urwid.Columns"""
def _select_first_selectable(self):
"""select our first selectable item (recursivly if that item SupportsNext)"""
i = self._first_selectable()
self.set_focus(i)
if isinstance(self.contents[i][0], SupportsNext):
self.contents[i][0]._select_first_selectable()
def _select_last_selectable(self):
"""select our last selectable item (recursivly if that item SupportsNext)"""
i = self._last_selectable()
self.set_focus(i)
if isinstance(self._contents[i][0], SupportsNext):
self.contents[i][0]._select_last_selectable()
def _first_selectable(self):
"""return sequence number of self.contents last selectable item"""
for j in range(0, len(self._contents)):
if self._contents[j][0].selectable():
return j
return False
def _last_selectable(self):
"""return sequence number of self._contents last selectable item"""
for j in range(len(self._contents) - 1, - 1, - 1):
if self._contents[j][0].selectable():
return j
return False
def keypress(self, size, key):
key = super(NextMixin, self).keypress(size, key)
if key == 'tab':
if self.outermost and self.focus_position == self._last_selectable():
self._select_first_selectable()
else:
for i in range(self.focus_position + 1, len(self._contents)):
if self._contents[i][0].selectable():
self.set_focus(i)
if isinstance(self._contents[i][0], SupportsNext):
self._contents[i][0]._select_first_selectable()
break
else: # no break
return key
elif key == 'shift tab':
if self.outermost and self.focus_position == self._first_selectable():
self._select_last_selectable()
else:
for i in range(self.focus_position - 1, 0 - 1, -1):
if self._contents[i][0].selectable():
self.set_focus(i)
if isinstance(self._contents[i][0], SupportsNext):
self._contents[i][0]._select_last_selectable()
break
else: # no break
return key
else:
return key
class NPile(NextMixin, urwid.Pile):
pass
class NColumns(NextMixin, urwid.Columns):
pass
class NListBox(SupportsNext, urwid.ListBox):
def _select_first_selectable(self):
"""select our first selectable item (recursivly if that item SupportsNext)"""
i = self._first_selectable()
self.set_focus(i)
if isinstance(self.body[i], SupportsNext):
self.body[i]._select_first_selectable()
def _select_last_selectable(self):
"""select our last selectable item (recursivly if that item SupportsNext)"""
i = self._last_selectable()
self.set_focus(i)
if isinstance(self.body[i], SupportsNext):
self.body[i]._select_last_selectable()
def _first_selectable(self):
"""return sequence number of self._contents last selectable item"""
for j in range(0, len(self.body)):
if self.body[j].selectable():
return j
return False
def _last_selectable(self):
"""return sequence number of self.contents last selectable item"""
for j in range(len(self.body) - 1, - 1, - 1):
if self.body[j].selectable():
return j
return False
def keypress(self, size, key):
key = super().keypress(size, key)
if key == 'tab':
if self.outermost and self.focus_position == self._last_selectable():
self._select_first_selectable()
else:
self._keypress_down(size)
elif key == 'shift tab':
if self.outermost and self.focus_position == self._first_selectable():
self._select_last_selectable()
else:
self._keypress_up(size)
else:
return key
class ValidatedEdit(urwid.WidgetWrap):
def __init__(self, *args, EditWidget=ExtendedEdit, validate=False, **kwargs):
assert validate
self._validate_func = validate
self._original_widget = urwid.AttrMap(EditWidget(*args, **kwargs), 'edit', 'editf')
super().__init__(self._original_widget)
@property
def _get_base_widget(self):
return self._original_widget
@property
def base_widget(self):
return self._original_widget.original_widget
def _validate(self):
text = self.base_widget.get_edit_text()
if self._validate_func(text):
self._original_widget.set_attr_map({None: 'edit'})
self._original_widget.set_focus_map({None: 'edit'})
return True
else:
self._original_widget.set_attr_map({None: 'alert'})
self._original_widget.set_focus_map({None: 'alert'})
return False
def get_edit_text(self):
self._validate()
return self.base_widget.get_edit_text()
@property
def edit_pos(self):
return self.base_widget.edit_pos
@property
def edit_text(self):
return self.base_widget.edit_text
def keypress(self, size, key):
if (
key in ['up', 'down', 'tab', 'shift tab'] or
(key in ['right'] and self.edit_pos >= len(self.edit_text)) or
(key in ['left'] and self.edit_pos == 0)):
if not self._validate():
return
return super().keypress(size, key)
class DurationWidget(urwid.WidgetWrap):
@staticmethod
def unsigned_int(number):
"""test if `number` can be converted to a positive int"""
try:
return int(number) >= 0
except ValueError:
return False
@staticmethod
def _convert_timedelta(dt):
seconds = dt.total_seconds()
days = int(seconds // (24 * 60 * 60))
hours = int((seconds // 3600) % 24)
minutes = int((seconds % 3600) // 60)
seconds = int(seconds % 60)
return days, hours, minutes, seconds
def __init__(self, dt):
days, hours, minutes, seconds = self._convert_timedelta(dt)
self.days_edit = ValidatedEdit(
edit_text=str(days), validate=self.unsigned_int, align='right')
self.hours_edit = ValidatedEdit(
edit_text=str(hours), validate=self.unsigned_int, align='right')
self.minutes_edit = ValidatedEdit(
edit_text=str(minutes), validate=self.unsigned_int, align='right')
self.seconds_edit = ValidatedEdit(
edit_text=str(seconds), validate=self.unsigned_int, align='right')
self.columns = NColumns([
(4, self.days_edit),
(2, urwid.Text('D')),
(3, self.hours_edit),
(2, urwid.Text('H')),
(3, self.minutes_edit),
(2, urwid.Text('M')),
(3, self.seconds_edit),
(2, urwid.Text('S')),
])
urwid.WidgetWrap.__init__(self, self.columns)
def get_timedelta(self):
return timedelta(
seconds=int(self.seconds_edit.get_edit_text()) +
int(self.minutes_edit.get_edit_text()) * 60 +
int(self.hours_edit.get_edit_text()) * 60 * 60 +
int(self.days_edit.get_edit_text()) * 24 * 60 * 60)
class AlarmsEditor(urwid.WidgetWrap):
class AlarmEditor(urwid.WidgetWrap):
def __init__(self, alarm, delete_handler):
duration, description = alarm
if duration.total_seconds() > 0:
direction = 'after'
else:
direction = 'before'
duration = -1 * duration
self.duration = DurationWidget(duration)
self.description = ExtendedEdit(edit_text=description)
self.direction = Choice(
['before', 'after'], active=direction, overlay_width=10)
self.columns = NColumns([
(2, urwid.Text(' ')),
(21, self.duration),
(14, urwid.Padding(self.direction, right=1)),
self.description,
(10, urwid.Button('Delete', on_press=delete_handler, user_data=self)),
])
urwid.WidgetWrap.__init__(self, self.columns)
def get_alarm(self):
direction = self.direction.active
if direction == 'before':
prefix = -1
else:
prefix = 1
return (prefix * self.duration.get_timedelta(), self.description.get_edit_text())
def __init__(self, event):
self.event = event
self.pile = NPile(
[urwid.Text('Alarms:')] +
[self.AlarmEditor(a, self.remove_alarm) for a in event.alarms] +
[urwid.Columns([(12, urwid.Button('Add', on_press=self.add_alarm))])])
urwid.WidgetWrap.__init__(self, self.pile)
def add_alarm(self, button):
self.pile.contents.insert(
len(self.pile.contents) - 1,
(self.AlarmEditor((timedelta(0), self.event.summary), self.remove_alarm),
('weight', 1)))
def remove_alarm(self, button, editor):
self.pile.contents.remove((editor, ('weight', 1)))
def get_alarms(self):
alarms = []
for widget, _ in self.pile.contents:
if isinstance(widget, self.AlarmEditor):
alarms.append(widget.get_alarm())
return alarms
@property
def changed(self):
try:
return self.event.alarms != self.get_alarms()
except ValueError:
return False