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# This file is part of MyPaint.
# Copyright (C) 2011-2018 by the MyPaint Development Team.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
from __future__ import division, print_function
from gettext import gettext as _
from lib.gibindings import Gtk
from .widgets import borderless_button
class ItemSpinBox (Gtk.HBox):
"""Control for selecting one of a small number of text items.
Somewhat like a `Gtk.SpinButton`, but with a textual ``(value,
display_value)`` list model, and with the buttons positioned at either
end of the central label. Hopefully nothing too unusual.
Intended as an alternative to `Gtk.ComboBox` which doesn't involve any
pointer grab breaking, which makes it more useful for dropdown panels.
"""
__gtype_name__ = "ItemSpinBox"
ARROW_SHADOW_TYPE = Gtk.ShadowType.OUT
def __init__(self, model=None, changed_cb=None, value=None):
super(ItemSpinBox, self).__init__()
self._left_button = borderless_button(tooltip=_("Previous item"))
self._left_button.add(
Gtk.Arrow.new(Gtk.ArrowType.LEFT, self.ARROW_SHADOW_TYPE))
self._left_button.connect("clicked", self._spin_button_clicked, -1)
self._right_button = borderless_button(tooltip=_("Next item"))
self._right_button.add(
Gtk.Arrow.new(Gtk.ArrowType.RIGHT, self.ARROW_SHADOW_TYPE))
self._right_button.connect("clicked", self._spin_button_clicked, 1)
self._label = Gtk.Label()
self.pack_start(self._left_button, False, False, 0)
self.pack_start(self._label, True, True, 0)
self.pack_start(self._right_button, False, False, 0)
self._changed_cb = None
self.set_changed_callback(changed_cb)
self._model = None
self._model_index = None
self.set_model(model, value)
def set_changed_callback(self, changed_cb):
"""Set the value-changed callback.
`changed_cb` will be called each time the user chooses a different item
in the list, with the ``value`` member from the model (see
`set_model()`).
"""
self._changed_cb = changed_cb
def set_model(self, model, value=None):
"""Set the model.
The `model` argument is either `None`, or a list of pairs of the form
``[(value, text), ...]``. The ``value``s must be unique and testable by
equality. The ``text`` values are what is displayed in the label area
of the `ItemSpinBox` widget.
"""
old_index = self._model_index
old_value = None
old_text = None
if old_index is not None:
old_value, old_text = self._model[old_index]
self._model = model
self._model_index = None
if value is None:
value = old_value
self.set_value(value)
model_valid = self._is_model_valid()
buttons_sensitive = model_valid and len(self._model) > 1
self._left_button.set_sensitive(buttons_sensitive)
self._right_button.set_sensitive(buttons_sensitive)
def _is_model_valid(self):
if self._model is None:
return False
if not self._model:
return False
if self._model_index is None:
return False
if self._model_index < 0:
return False
if self._model_index >= len(self._model):
return False
return True
def _update_label(self):
if not self._is_model_valid():
text = _("(Nothing to show)")
self._label.set_sensitive(False)
else:
value, text = self._model[self._model_index]
self._label.set_sensitive(True)
self._label.set_text(text)
def get_value(self):
if not self._is_model_valid():
return None
value, text = self._model[self._model_index]
return value
def set_value(self, value, notify=False):
new_value = None
if not self._model:
self._model_index = None
self._update_label()
new_value = None
else:
found = False
for i, entry in enumerate(self._model):
v, t = entry
if v == value:
self._model_index = i
self._update_label()
new_value = v
found = True
break
if not found:
self._model_index = 0
self._update_label()
new_value = self._model[0][0]
if notify and self._changed_cb is not None:
self._changed_cb(new_value)
def _spin_button_clicked(self, widget, delta):
self._spin(delta)
def _spin(self, delta):
if not self._is_model_valid():
return
i = self._model_index + delta
while i < 0:
i += len(self._model)
i %= len(self._model)
self._model_index = i
self._update_label()
if self._changed_cb is not None:
self._changed_cb(self.get_value())
def next(self):
"""Spin to the next item"""
self._spin(1)
def previous(self):
"""Spin to the previous item"""
self._spin(-1)
if __name__ == '__main__':
win = Gtk.Window()
win.set_title("spinbox test")
win.connect("destroy", Gtk.main_quit)
vbox = Gtk.VBox()
win.add(vbox)
def changed_cb(new_value):
print("SSB changed:", new_value)
sb0 = ItemSpinBox(None, changed_cb)
vbox.pack_start(sb0, False, False, 0)
fruits = "Apple Orange Pear Banana Lychee Herring Guava".split()
model1 = list(enumerate(fruits))
sb1 = ItemSpinBox(model1, changed_cb)
vbox.pack_start(sb1, False, False, 0)
sb1a = ItemSpinBox(model1, changed_cb, 4)
vbox.pack_start(sb1a, False, False, 0)
model2 = [(0, "Single value")]
sb2 = ItemSpinBox(model2, changed_cb)
vbox.pack_start(sb2, False, False, 0)
sb3 = ItemSpinBox()
vbox.pack_start(sb3, False, False, 0)
win.show_all()
Gtk.main()
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