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"""
This is a Gtk TreeView to list and modify the plotted functions
"""
# Copyright (C) 2012 S. Daniel Francis <francis@sugarlabs.org>
#
# 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 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.
import logging
logger = logging.getLogger('functions')
import gobject
import gtk
from sugar.graphics import style
from sugar.graphics.xocolor import XoColor
from sugar.graphics.icon import CellRendererIcon
def color2string(color):
color_string = ["#"]
color_string.append("%02x" % (color.red / 256))
color_string.append("%02x" % (color.green / 256))
color_string.append("%02x" % (color.blue / 256))
return "".join(color_string)
class FunctionsList(gtk.TreeView):
__gsignals__ = {'list-updated': (gobject.SIGNAL_RUN_LAST,
gobject.TYPE_NONE,
(gobject.TYPE_PYOBJECT,)),
'function-selected': (gobject.SIGNAL_RUN_LAST,
gobject.TYPE_NONE,
(gobject.TYPE_PYOBJECT,))}
def __init__(self):
gtk.TreeView.__init__(self)
self.set_rules_hint(True)
self.grab_focus()
self.model = gtk.ListStore(object, str, str, str, bool)
self.set_model(self.model)
column = gtk.TreeViewColumn()
color_renderer = CellRendererIcon(self)
color_renderer.set_fixed_size(int(style.SMALL_ICON_SIZE * 4), -1)
color_renderer.props.size = style.SMALL_ICON_SIZE * 1.25
color_renderer.set_icon_name('color-preview')
color_renderer.props.stroke_color = style.COLOR_BUTTON_GREY.get_svg()
color_renderer.props.fill_color = style.COLOR_TRANSPARENT.get_svg()
color_renderer.props.prelit_stroke_color = "#666666"
color_renderer.props.prelit_fill_color = "#FFFFFF"
column.pack_start(color_renderer, False)
column.add_attribute(color_renderer, 'xo-color', 0)
name_renderer = gtk.CellRendererText()
column.pack_start(name_renderer, False)
column.add_attribute(name_renderer, 'text', 1)
text_renderer = gtk.CellRendererText()
text_renderer.set_property('editable', True)
text_renderer.connect('edited', self._function_changed)
column.pack_start(text_renderer, True)
column.add_attribute(text_renderer, 'text', 2)
self.set_headers_visible(False)
self.append_column(column)
self.evaluating_column = gtk.TreeViewColumn()
y_renderer = gtk.CellRendererText()
y_renderer.set_property('text', ' = ')
self.evaluating_column.pack_start(y_renderer, False)
evaluation_cell = gtk.CellRendererText()
self.evaluating_column.pack_start(evaluation_cell, False)
self.evaluating_column.add_attribute(evaluation_cell, 'text', 3)
self.append_column(self.evaluating_column)
self.evaluating_column.set_visible(False)
self.selection = self.get_selection()
self.selection.set_select_function(self.update_color)
self.updating_color = False
def evaluate(self, safe_dict):
for func in self.model:
if safe_dict['x'] == None:
self.evaluating_column.set_visible(False)
return
result = eval(func[2].replace('^', '**'),
{'__builtins__': {}}, safe_dict)
func[3] = str(result)
self.evaluating_column.set_visible(True)
def set_current_line_color(self, color):
if not self.updating_color:
rows = self.selection.get_selected_rows()
self.model[rows[1][0]][0] = XoColor(color2string(color) + "," +\
color2string(color))
def update_color(self, info):
path = info[0]
for i in self.model:
i[-1] = False
color = self.model[path][0]
self.updating_color = True
self.model[path][-1] = True
self.emit('function-selected', color.get_fill_color())
self.updating_color = False
return True
def get_list(self):
funcs = []
for func in self.model:
row = [gtk.gdk.color_parse(func[0].get_fill_color()),
func[1], func[2], func[-1]]
funcs.append(row)
logger.debug(str(funcs))
return funcs
def _function_changed(self, widget, path, new_text):
self.model[path][2] = new_text
for i in self.model:
i[-1] = False
self.model[path][-1] = True
self.emit('list-updated', self.get_list())
def append_function(self, color, expression='sin(x)'):
self.selection.select_iter(self.model.append([XoColor(color + "," +\
color),
"y%d = " % (len(self.model) + 1),
expression, None, True]))
def remove_function(self):
rows = self.selection.get_selected_rows()
_iter = self.model.get_iter(rows[1][0])
self.model.remove(_iter)
count = 0
for i in self.model:
count += 1
i[1] = 'y%d =' % count
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