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
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
#------------------------------------------------------------------------------
# Copyright (c) 2005-2007 by Enthought, Inc.
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in enthought/LICENSE.txt and may be redistributed only
# under the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
# Thanks for using Enthought open source!
#
#------------------------------------------------------------------------------
""" Trait definition for a wxPython-based Kiva font.
"""
#-------------------------------------------------------------------------------
# Imports:
#-------------------------------------------------------------------------------
from traits.etsconfig.api import ETSConfig
if ETSConfig.toolkit == 'wx':
from .ui.wx.kiva_font_editor import KivaFontEditor
elif ETSConfig.toolkit == 'qt4':
# FIXME
#from .ui.qt4.kiva_font_editor import KivaFontEditor
KivaFontEditor = None
else:
KivaFontEditor = None
from traits.api import Trait, TraitError, TraitHandler, TraitFactory
#-------------------------------------------------------------------------------
# Convert a string into a valid 'Font' object (if possible):
#-------------------------------------------------------------------------------
# Strings to ignore in text representations of fonts
font_noise = [ 'pt', 'point', 'family' ]
font_families = font_styles = font_weights = DEFAULT = NORMAL = None
def init_constants ( ):
""" Dynamically load Kiva constants to avoid import dependencies.
"""
global font_families, font_styles, font_weights, default_face, DEFAULT, NORMAL
if font_families is not None:
return
import kiva.constants as kc
DEFAULT = kc.DEFAULT
NORMAL = kc.NORMAL
# Mapping of strings to valid Kiva font families:
font_families = {
'default': kc.DEFAULT,
'decorative': kc.DECORATIVE,
'roman': kc.ROMAN,
'script': kc.SCRIPT,
'swiss': kc.SWISS,
'modern': kc.MODERN
}
# Mapping of strings to Kiva font styles:
font_styles = {
'italic': kc.ITALIC
}
# Mapping of strings to Kiva font weights:
font_weights = {
'bold': kc.BOLD
}
default_face = {
kc.SWISS: "Arial",
kc.ROMAN: "Times",
kc.MODERN: "Courier",
kc.SCRIPT: "Zapfino",
kc.DECORATIVE: "Zapfino", # need better choice for this
}
# Strings to ignore in text representations of fonts
font_noise = [ 'pt', 'point', 'family' ]
#-------------------------------------------------------------------------------
# 'TraitKivaFont' class'
#-------------------------------------------------------------------------------
class TraitKivaFont ( TraitHandler ):
""" Ensures that values assigned to a trait attribute are valid font
descriptor strings for Kiva fonts; the value actually assigned is the
corresponding Kiva font.
"""
#---------------------------------------------------------------------------
# Validates that the value is a valid font:
#---------------------------------------------------------------------------
def validate ( self, object, name, value ):
""" Validates that the value is a valid font.
"""
from kiva.fonttools import Font
if isinstance( value, Font ):
return value
# Make sure all Kiva related data is loaded:
init_constants()
try:
point_size = 10
family = DEFAULT
style = NORMAL
weight = NORMAL
underline = 0
facename = []
for word in value.split():
lword = word.lower()
if font_families.has_key( lword ):
family = font_families[ lword ]
elif font_styles.has_key( lword ):
style = font_styles[ lword ]
elif font_weights.has_key( lword ):
weight = font_weights[ lword ]
elif lword == 'underline':
underline = 1
elif lword not in font_noise:
try:
point_size = int( lword )
except:
facename.append( word )
if facename == "":
facename = default_face.get(family, "")
return Font(face_name = " ".join(facename),
size = point_size,
family = family,
weight = weight,
style = style,
underline = underline)
except:
pass
raise TraitError, ( object, name, 'a font descriptor string',
repr( value ) )
def info ( self ):
return ( "a string describing a font (e.g. '12 pt bold italic "
"swiss family Arial' or 'default 12')" )
fh = TraitKivaFont()
if KivaFontEditor is not None:
KivaFontTrait = Trait(fh.validate(None, None, 'modern 12'), fh,
editor = KivaFontEditor)
else:
KivaFontTrait = Trait(fh.validate(None, None, 'modern 12'), fh)
def KivaFontFunc ( *args, **metadata ):
""" Returns a trait whose value must be a GUI toolkit-specific font.
Description
-----------
For wxPython, the returned trait accepts any of the following:
* an kiva.fonttools.Font instance
* a string describing the font, including one or more of the font family,
size, weight, style, and typeface name.
Default Value
-------------
For wxPython, 'Arial 10'
"""
return KivaFontTrait( *args, **metadata )
KivaFont = TraitFactory( KivaFontFunc )
|
