1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
|
"""
Copyright 2007 Free Software Foundation, Inc.
This file is part of GNU Radio
GNU Radio Companion 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.
GNU Radio Companion 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
"""
import Utils
from Element import Element
import pygtk
pygtk.require('2.0')
import gtk
import pango
from Constants import PARAM_LABEL_FONT, PARAM_FONT
class Param(Element):
"""The graphical parameter."""
def update(self):
"""
Called when an external change occurs.
Update the graphical input by calling the change handler.
"""
if hasattr(self, '_input'): self._handle_changed()
def get_input_object(self, callback=None):
"""
Get the graphical gtk object to represent this parameter.
Create the input object with this data type and the handle changed method.
@param callback a function of one argument(this param) to be called from the change handler
@return gtk input object
"""
self._callback = callback
self._input = self.get_input_class()(self, self._handle_changed)
if not self._callback: self.update()
return self._input
def _handle_changed(self, widget=None):
"""
When the input changes, write the inputs to the data type.
Finish by calling the exteral callback.
"""
value = self._input.get_text()
if self.is_enum(): value = self.get_option_keys()[int(value)]
self.set_value(value)
#set the markup on the label, red for errors in corresponding data type.
name = '<span font_desc="%s">%s</span>'%(
PARAM_LABEL_FONT,
Utils.xml_encode(self.get_name()),
)
#special markups if param is involved in a callback
if hasattr(self.get_parent(), 'get_callbacks') and \
filter(lambda c: self.get_key() in c, self.get_parent()._callbacks):
name = '<span underline="low">%s</span>'%name
if not self.is_valid():
self._input.set_markup('<span foreground="red">%s</span>'%name)
tip = 'Error: ' + ' '.join(self.get_error_messages())
else:
self._input.set_markup(name)
tip = 'Value: %s'%str(self.evaluate())
#hide/show
if self.get_hide() == 'all': self._input.hide_all()
else: self._input.show_all()
#set the color
self._input.set_color(self.get_color())
#set the tooltip
if self._input.tp: self._input.tp.set_tip(
self._input.entry,
'Key: %s\nType: %s\n%s'%(self.get_key(), self.get_type(), tip),
)
#execute the external callback
if self._callback: self._callback(self)
def get_markup(self):
"""
Create a markup to display the param as a label on the block.
If the param is valid, use the param's repr representation.
Otherwise, create a markup for error.
@return pango markup string
"""
if self.is_valid():
return '<b>%s:</b> %s'%(Utils.xml_encode(self.get_name()), Utils.xml_encode(repr(self)))
else:
return '<span foreground="red"><b>%s:</b> error</span>'%Utils.xml_encode(self.get_name())
def get_layout(self):
"""
Create a layout based on the current markup.
@return the pango layout
"""
layout = gtk.DrawingArea().create_pango_layout('')
layout.set_markup(self.get_markup())
desc = pango.FontDescription(PARAM_FONT)
layout.set_font_description(desc)
return layout
|
