Current File : //snap/core20/2379/lib/python3/dist-packages/urwid/wimp.py
#!/usr/bin/python
#
# Urwid Window-Icon-Menu-Pointer-style widget classes
# Copyright (C) 2004-2011 Ian Ward
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# Urwid web site: http://excess.org/urwid/
from __future__ import division, print_function
from urwid.widget import (Text, WidgetWrap, delegate_to_widget_mixin, BOX,
FLOW)
from urwid.canvas import CompositeCanvas
from urwid.signals import connect_signal
from urwid.container import Columns, Overlay
from urwid.util import is_mouse_press
from urwid.text_layout import calc_coords
from urwid.signals import disconnect_signal # doctests
from urwid.split_repr import python3_repr
from urwid.decoration import WidgetDecoration
from urwid.command_map import ACTIVATE
class SelectableIcon(Text):
_selectable = True
def __init__(self, text, cursor_position=1):
"""
:param text: markup for this widget; see :class:`Text` for
description of text markup
:param cursor_position: position the cursor will appear in the
text when this widget is in focus
This is a text widget that is selectable. A cursor
displayed at a fixed location in the text when in focus.
This widget has no special handling of keyboard or mouse input.
"""
self.__super.__init__(text)
self._cursor_position = cursor_position
def render(self, size, focus=False):
"""
Render the text content of this widget with a cursor when
in focus.
>>> si = SelectableIcon(u"[!]")
>>> si
<SelectableIcon selectable flow widget '[!]'>
>>> si.render((4,), focus=True).cursor
(1, 0)
>>> si = SelectableIcon("((*))", 2)
>>> si.render((8,), focus=True).cursor
(2, 0)
>>> si.render((2,), focus=True).cursor
(0, 1)
"""
c = self.__super.render(size, focus)
if focus:
# create a new canvas so we can add a cursor
c = CompositeCanvas(c)
c.cursor = self.get_cursor_coords(size)
return c
def get_cursor_coords(self, size):
"""
Return the position of the cursor if visible. This method
is required for widgets that display a cursor.
"""
if self._cursor_position > len(self.text):
return None
# find out where the cursor will be displayed based on
# the text layout
(maxcol,) = size
trans = self.get_line_translation(maxcol)
x, y = calc_coords(self.text, trans, self._cursor_position)
if maxcol <= x:
return None
return x, y
def keypress(self, size, key):
"""
No keys are handled by this widget. This method is
required for selectable widgets.
"""
return key
class CheckBoxError(Exception):
pass
class CheckBox(WidgetWrap):
def sizing(self):
return frozenset([FLOW])
states = {
True: SelectableIcon("[X]"),
False: SelectableIcon("[ ]"),
'mixed': SelectableIcon("[#]") }
reserve_columns = 4
# allow users of this class to listen for change events
# sent when the state of this widget is modified
# (this variable is picked up by the MetaSignals metaclass)
signals = ["change", 'postchange']
def __init__(self, label, state=False, has_mixed=False,
on_state_change=None, user_data=None):
"""
:param label: markup for check box label
:param state: False, True or "mixed"
:param has_mixed: True if "mixed" is a state to cycle through
:param on_state_change: shorthand for connect_signal()
function call for a single callback
:param user_data: user_data for on_state_change
Signals supported: ``'change'``, ``"postchange"``
Register signal handler with::
urwid.connect_signal(check_box, 'change', callback, user_data)
where callback is callback(check_box, new_state [,user_data])
Unregister signal handlers with::
urwid.disconnect_signal(check_box, 'change', callback, user_data)
>>> CheckBox(u"Confirm")
<CheckBox selectable flow widget 'Confirm' state=False>
>>> CheckBox(u"Yogourt", "mixed", True)
<CheckBox selectable flow widget 'Yogourt' state='mixed'>
>>> cb = CheckBox(u"Extra onions", True)
>>> cb
<CheckBox selectable flow widget 'Extra onions' state=True>
>>> cb.render((20,), focus=True).text # ... = b in Python 3
[...'[X] Extra onions ']
"""
self.__super.__init__(None) # self.w set by set_state below
self._label = Text("")
self.has_mixed = has_mixed
self._state = None
# The old way of listening for a change was to pass the callback
# in to the constructor. Just convert it to the new way:
if on_state_change:
connect_signal(self, 'change', on_state_change, user_data)
self.set_label(label)
self.set_state(state)
def _repr_words(self):
return self.__super._repr_words() + [
python3_repr(self.label)]
def _repr_attrs(self):
return dict(self.__super._repr_attrs(),
state=self.state)
def set_label(self, label):
"""
Change the check box label.
label -- markup for label. See Text widget for description
of text markup.
>>> cb = CheckBox(u"foo")
>>> cb
<CheckBox selectable flow widget 'foo' state=False>
>>> cb.set_label(('bright_attr', u"bar"))
>>> cb
<CheckBox selectable flow widget 'bar' state=False>
"""
self._label.set_text(label)
# no need to call self._invalidate(). WidgetWrap takes care of
# that when self.w changes
def get_label(self):
"""
Return label text.
>>> cb = CheckBox(u"Seriously")
>>> print(cb.get_label())
Seriously
>>> print(cb.label)
Seriously
>>> cb.set_label([('bright_attr', u"flashy"), u" normal"])
>>> print(cb.label) # only text is returned
flashy normal
"""
return self._label.text
label = property(get_label)
def set_state(self, state, do_callback=True):
"""
Set the CheckBox state.
state -- True, False or "mixed"
do_callback -- False to suppress signal from this change
>>> changes = []
>>> def callback_a(cb, state, user_data):
... changes.append("A %r %r" % (state, user_data))
>>> def callback_b(cb, state):
... changes.append("B %r" % state)
>>> cb = CheckBox('test', False, False)
>>> key1 = connect_signal(cb, 'change', callback_a, "user_a")
>>> key2 = connect_signal(cb, 'change', callback_b)
>>> cb.set_state(True) # both callbacks will be triggered
>>> cb.state
True
>>> disconnect_signal(cb, 'change', callback_a, "user_a")
>>> cb.state = False
>>> cb.state
False
>>> cb.set_state(True)
>>> cb.state
True
>>> cb.set_state(False, False) # don't send signal
>>> changes
["A True 'user_a'", 'B True', 'B False', 'B True']
"""
if self._state == state:
return
if state not in self.states:
raise CheckBoxError("%s Invalid state: %s" % (
repr(self), repr(state)))
# self._state is None is a special case when the CheckBox
# has just been created
old_state = self._state
if do_callback and old_state is not None:
self._emit('change', state)
self._state = state
# rebuild the display widget with the new state
self._w = Columns( [
('fixed', self.reserve_columns, self.states[state] ),
self._label ] )
self._w.focus_col = 0
if do_callback and old_state is not None:
self._emit('postchange', old_state)
def get_state(self):
"""Return the state of the checkbox."""
return self._state
state = property(get_state, set_state)
def keypress(self, size, key):
"""
Toggle state on 'activate' command.
>>> assert CheckBox._command_map[' '] == 'activate'
>>> assert CheckBox._command_map['enter'] == 'activate'
>>> size = (10,)
>>> cb = CheckBox('press me')
>>> cb.state
False
>>> cb.keypress(size, ' ')
>>> cb.state
True
>>> cb.keypress(size, ' ')
>>> cb.state
False
"""
if self._command_map[key] != ACTIVATE:
return key
self.toggle_state()
def toggle_state(self):
"""
Cycle to the next valid state.
>>> cb = CheckBox("3-state", has_mixed=True)
>>> cb.state
False
>>> cb.toggle_state()
>>> cb.state
True
>>> cb.toggle_state()
>>> cb.state
'mixed'
>>> cb.toggle_state()
>>> cb.state
False
"""
if self.state == False:
self.set_state(True)
elif self.state == True:
if self.has_mixed:
self.set_state('mixed')
else:
self.set_state(False)
elif self.state == 'mixed':
self.set_state(False)
def mouse_event(self, size, event, button, x, y, focus):
"""
Toggle state on button 1 press.
>>> size = (20,)
>>> cb = CheckBox("clickme")
>>> cb.state
False
>>> cb.mouse_event(size, 'mouse press', 1, 2, 0, True)
True
>>> cb.state
True
"""
if button != 1 or not is_mouse_press(event):
return False
self.toggle_state()
return True
class RadioButton(CheckBox):
states = {
True: SelectableIcon("(X)"),
False: SelectableIcon("( )"),
'mixed': SelectableIcon("(#)") }
reserve_columns = 4
def __init__(self, group, label, state="first True",
on_state_change=None, user_data=None):
"""
:param group: list for radio buttons in same group
:param label: markup for radio button label
:param state: False, True, "mixed" or "first True"
:param on_state_change: shorthand for connect_signal()
function call for a single 'change' callback
:param user_data: user_data for on_state_change
This function will append the new radio button to group.
"first True" will set to True if group is empty.
Signals supported: ``'change'``, ``"postchange"``
Register signal handler with::
urwid.connect_signal(radio_button, 'change', callback, user_data)
where callback is callback(radio_button, new_state [,user_data])
Unregister signal handlers with::
urwid.disconnect_signal(radio_button, 'change', callback, user_data)
>>> bgroup = [] # button group
>>> b1 = RadioButton(bgroup, u"Agree")
>>> b2 = RadioButton(bgroup, u"Disagree")
>>> len(bgroup)
2
>>> b1
<RadioButton selectable flow widget 'Agree' state=True>
>>> b2
<RadioButton selectable flow widget 'Disagree' state=False>
>>> b2.render((15,), focus=True).text # ... = b in Python 3
[...'( ) Disagree ']
"""
if state=="first True":
state = not group
self.group = group
self.__super.__init__(label, state, False, on_state_change,
user_data)
group.append(self)
def set_state(self, state, do_callback=True):
"""
Set the RadioButton state.
state -- True, False or "mixed"
do_callback -- False to suppress signal from this change
If state is True all other radio buttons in the same button
group will be set to False.
>>> bgroup = [] # button group
>>> b1 = RadioButton(bgroup, u"Agree")
>>> b2 = RadioButton(bgroup, u"Disagree")
>>> b3 = RadioButton(bgroup, u"Unsure")
>>> b1.state, b2.state, b3.state
(True, False, False)
>>> b2.set_state(True)
>>> b1.state, b2.state, b3.state
(False, True, False)
>>> def relabel_button(radio_button, new_state):
... radio_button.set_label(u"Think Harder!")
>>> key = connect_signal(b3, 'change', relabel_button)
>>> b3
<RadioButton selectable flow widget 'Unsure' state=False>
>>> b3.set_state(True) # this will trigger the callback
>>> b3
<RadioButton selectable flow widget 'Think Harder!' state=True>
"""
if self._state == state:
return
self.__super.set_state(state, do_callback)
# if we're clearing the state we don't have to worry about
# other buttons in the button group
if state is not True:
return
# clear the state of each other radio button
for cb in self.group:
if cb is self: continue
if cb._state:
cb.set_state(False)
def toggle_state(self):
"""
Set state to True.
>>> bgroup = [] # button group
>>> b1 = RadioButton(bgroup, "Agree")
>>> b2 = RadioButton(bgroup, "Disagree")
>>> b1.state, b2.state
(True, False)
>>> b2.toggle_state()
>>> b1.state, b2.state
(False, True)
>>> b2.toggle_state()
>>> b1.state, b2.state
(False, True)
"""
self.set_state(True)
class Button(WidgetWrap):
def sizing(self):
return frozenset([FLOW])
button_left = Text("<")
button_right = Text(">")
signals = ["click"]
def __init__(self, label, on_press=None, user_data=None):
"""
:param label: markup for button label
:param on_press: shorthand for connect_signal()
function call for a single callback
:param user_data: user_data for on_press
Signals supported: ``'click'``
Register signal handler with::
urwid.connect_signal(button, 'click', callback, user_data)
where callback is callback(button [,user_data])
Unregister signal handlers with::
urwid.disconnect_signal(button, 'click', callback, user_data)
>>> Button(u"Ok")
<Button selectable flow widget 'Ok'>
>>> b = Button("Cancel")
>>> b.render((15,), focus=True).text # ... = b in Python 3
[...'< Cancel >']
"""
self._label = SelectableIcon("", 0)
cols = Columns([
('fixed', 1, self.button_left),
self._label,
('fixed', 1, self.button_right)],
dividechars=1)
self.__super.__init__(cols)
# The old way of listening for a change was to pass the callback
# in to the constructor. Just convert it to the new way:
if on_press:
connect_signal(self, 'click', on_press, user_data)
self.set_label(label)
def _repr_words(self):
# include button.label in repr(button)
return self.__super._repr_words() + [
python3_repr(self.label)]
def set_label(self, label):
"""
Change the button label.
label -- markup for button label
>>> b = Button("Ok")
>>> b.set_label(u"Yup yup")
>>> b
<Button selectable flow widget 'Yup yup'>
"""
self._label.set_text(label)
def get_label(self):
"""
Return label text.
>>> b = Button(u"Ok")
>>> print(b.get_label())
Ok
>>> print(b.label)
Ok
"""
return self._label.text
label = property(get_label)
def keypress(self, size, key):
"""
Send 'click' signal on 'activate' command.
>>> assert Button._command_map[' '] == 'activate'
>>> assert Button._command_map['enter'] == 'activate'
>>> size = (15,)
>>> b = Button(u"Cancel")
>>> clicked_buttons = []
>>> def handle_click(button):
... clicked_buttons.append(button.label)
>>> key = connect_signal(b, 'click', handle_click)
>>> b.keypress(size, 'enter')
>>> b.keypress(size, ' ')
>>> clicked_buttons # ... = u in Python 2
[...'Cancel', ...'Cancel']
"""
if self._command_map[key] != ACTIVATE:
return key
self._emit('click')
def mouse_event(self, size, event, button, x, y, focus):
"""
Send 'click' signal on button 1 press.
>>> size = (15,)
>>> b = Button(u"Ok")
>>> clicked_buttons = []
>>> def handle_click(button):
... clicked_buttons.append(button.label)
>>> key = connect_signal(b, 'click', handle_click)
>>> b.mouse_event(size, 'mouse press', 1, 4, 0, True)
True
>>> b.mouse_event(size, 'mouse press', 2, 4, 0, True) # ignored
False
>>> clicked_buttons # ... = u in Python 2
[...'Ok']
"""
if button != 1 or not is_mouse_press(event):
return False
self._emit('click')
return True
class PopUpLauncher(delegate_to_widget_mixin('_original_widget'),
WidgetDecoration):
def __init__(self, original_widget):
self.__super.__init__(original_widget)
self._pop_up_widget = None
def create_pop_up(self):
"""
Subclass must override this method and return a widget
to be used for the pop-up. This method is called once each time
the pop-up is opened.
"""
raise NotImplementedError("Subclass must override this method")
def get_pop_up_parameters(self):
"""
Subclass must override this method and have it return a dict, eg:
{'left':0, 'top':1, 'overlay_width':30, 'overlay_height':4}
This method is called each time this widget is rendered.
"""
raise NotImplementedError("Subclass must override this method")
def open_pop_up(self):
self._pop_up_widget = self.create_pop_up()
self._invalidate()
def close_pop_up(self):
self._pop_up_widget = None
self._invalidate()
def render(self, size, focus=False):
canv = self.__super.render(size, focus)
if self._pop_up_widget:
canv = CompositeCanvas(canv)
canv.set_pop_up(self._pop_up_widget, **self.get_pop_up_parameters())
return canv
class PopUpTarget(WidgetDecoration):
# FIXME: this whole class is a terrible hack and must be fixed
# when layout and rendering are separated
_sizing = set([BOX])
_selectable = True
def __init__(self, original_widget):
self.__super.__init__(original_widget)
self._pop_up = None
self._current_widget = self._original_widget
def _update_overlay(self, size, focus):
canv = self._original_widget.render(size, focus=focus)
self._cache_original_canvas = canv # imperfect performance hack
pop_up = canv.get_pop_up()
if pop_up:
left, top, (
w, overlay_width, overlay_height) = pop_up
if self._pop_up != w:
self._pop_up = w
self._current_widget = Overlay(w, self._original_widget,
('fixed left', left), overlay_width,
('fixed top', top), overlay_height)
else:
self._current_widget.set_overlay_parameters(
('fixed left', left), overlay_width,
('fixed top', top), overlay_height)
else:
self._pop_up = None
self._current_widget = self._original_widget
def render(self, size, focus=False):
self._update_overlay(size, focus)
return self._current_widget.render(size, focus=focus)
def get_cursor_coords(self, size):
self._update_overlay(size, True)
return self._current_widget.get_cursor_coords(size)
def get_pref_col(self, size):
self._update_overlay(size, True)
return self._current_widget.get_pref_col(size)
def keypress(self, size, key):
self._update_overlay(size, True)
return self._current_widget.keypress(size, key)
def move_cursor_to_coords(self, size, x, y):
self._update_overlay(size, True)
return self._current_widget.move_cursor_to_coords(size, x, y)
def mouse_event(self, size, event, button, x, y, focus):
self._update_overlay(size, focus)
return self._current_widget.mouse_event(size, event, button, x, y, focus)
def pack(self, size=None, focus=False):
self._update_overlay(size, focus)
return self._current_widget.pack(size)
def _test():
import doctest
doctest.testmod()
if __name__=='__main__':
_test()
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