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
|
/*
Copyright (c) 2011 by Simon Schneegans
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 3 of the License, or (at your option)
any later version.
This program 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, see <http://www.gnu.org/licenses/>.
*/
namespace GnomePie {
/////////////////////////////////////////////////////////////////////////
/// A class representing string, rendered on an Image.
/////////////////////////////////////////////////////////////////////////
public class RenderedText : Image {
/////////////////////////////////////////////////////////////////////
/// A cache which stores images. It is cleared when the theme of
/// Gnome-Pie changes.
/// The key is in form <string>@<width>x<height>:<font>.
/////////////////////////////////////////////////////////////////////
private static Gee.HashMap<string, Cairo.ImageSurface?> cache { private get; private set; }
/////////////////////////////////////////////////////////////////////
/// Initializes the cache.
/////////////////////////////////////////////////////////////////////
public static void init() {
clear_cache();
Config.global.notify["theme"].connect(() => {
clear_cache();
});
}
/////////////////////////////////////////////////////////////////////
/// Clears the cache.
/////////////////////////////////////////////////////////////////////
static void clear_cache() {
cache = new Gee.HashMap<string, Cairo.ImageSurface?>();
}
/////////////////////////////////////////////////////////////////////
/// C'tor, creates a new image representation of a string.
/////////////////////////////////////////////////////////////////////
public RenderedText(string text, int width, int height, string font) {
var cached = this.cache.get("%s@%ux%u:%s".printf(text, width, height, font));
if (cached == null) {
this.render_text(text, width, height, font);
this.cache.set("%s@%ux%u:%s".printf(text, width, height, font), this.surface);
} else {
this.surface = cached;
}
}
/////////////////////////////////////////////////////////////////////
/// Creates a new transparent image, with text written onto.
/////////////////////////////////////////////////////////////////////
public void render_text(string text, int width, int height, string font) {
this.surface = new Cairo.ImageSurface(Cairo.Format.ARGB32, width, height);
var ctx = this.context();
// set the color as specified in the current theme
Color color = Config.global.theme.caption_color;
ctx.set_source_rgb(color.r, color.g, color.g);
var layout = Pango.cairo_create_layout(ctx);
layout.set_width(Pango.units_from_double(width));
var font_description = Pango.FontDescription.from_string(font);
font_description.set_size((int)(font_description.get_size() * Config.global.global_scale));
layout.set_font_description(font_description);
layout.set_text(text, -1);
// add newlines at the end of each line, in order to allow ellipsizing
string broken_string = "";
foreach (var line in layout.get_lines()) {
broken_string = broken_string.concat(text.substring(line.start_index, line.length), "\n");
}
layout.set_text(broken_string, broken_string.length-1);
layout.set_ellipsize(Pango.EllipsizeMode.END);
layout.set_alignment(Pango.Alignment.CENTER);
Pango.Rectangle extents;
layout.get_pixel_extents(null, out extents);
ctx.move_to(0, (int)(0.5*(height - extents.height)));
Pango.cairo_update_layout(ctx, layout);
Pango.cairo_show_layout(ctx, layout);
}
}
}
|
