/usr/share/nickle/nichrome-text.5c is in cairo-5c 1.10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 | /*
* Copyright © 2012 Keith Packard <keithp@keithp.com>
*
* 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; version 2 of the License.
*
* 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, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
autoload Nichrome;
autoload Nichrome::Scrollbar;
extend namespace Nichrome {
public namespace Text {
import Cairo;
typedef struct {
int pos;
int len;
} line_t;
public typedef widget_t + struct {
string text;
string font;
rgba_color_t color;
font_extents_t font_extents;
int top;
int lines;
real old_width;
bool dirty;
line_t[*] layout;
*Scrollbar::scrollbar_t scrollbar;
} text_t;
/* just after the previous newline */
int bol(&text_t text, int pos) {
for (; --pos >= 0;)
if (text.text[pos] == '\n')
return pos + 1;
return 0;
}
/* on the next newline */
int eol (&text_t text, int pos) {
for (; pos < String::length(text.text); pos++)
if (text.text[pos] == '\n')
return pos;
return pos;
}
/* column number of 'pos' */
int column (&text_t e, int pos) {
return pos - bol(&e, pos);
}
/* basic text motion */
int left(&text_t text, int pos) {
if (pos > 0)
return pos - 1;
return pos;
}
int right(&text_t text, int pos) {
if (pos < String::length(text.text))
return pos + 1;
return pos;
}
int up(&text_t text, int pos) {
int e = bol(&text, pos) - 1;
if (e >= 0) {
int prev = bol(&text, e);
return min(prev + column(&text, pos), e);
}
return pos;
}
int down(&text_t text, int pos) {
int next = eol(&text, pos) + 1;
if (next <= String::length(text.text))
return min(eol(&text, next),
next + column(&text, pos));
return pos;
}
/* painted width of specified subset of text */
real width(cairo_t cr, &text_t text, int start, int end) {
text_extents_t t = text_extents(cr, String::substr(text.text, start,
end-start));
return t.x_advance;
}
void set_scroll(&text_t text) {
if (is_uninit(&text.scrollbar))
return;
real top = text.top / dim(text.layout);
real bottom = min((text.top + text.lines) / dim(text.layout), 1);
Scrollbar::set(text.scrollbar,
top, bottom - top);
}
void prep(cairo_t cr, &text_t text) {
set_font(cr, text.font);
text.font_extents = font_extents(cr);
if (text.old_width != text.geometry.width) {
text.dirty = true;
text.old_width = text.geometry.width;
}
if (text.dirty) {
text.layout = (line_t[...]) {};
int pos = 0;
int l = 0;
do {
int e = eol(&text, pos);
while (e > pos + 1 && width(cr, &text, pos, e) > text.geometry.width)
e--;
text.layout[l] = (line_t) { .pos = pos,
.len = e - pos };
pos = e;
if (pos < String::length(text.text) && text.text[pos] == '\n')
pos++;
l++;
} while (pos < String::length(text.text));
text.dirty = false;
}
text.top = min(text.top, dim(text.layout) - 1);
text.lines = max (1, floor(text.geometry.height / text.font_extents.height));
set_scroll(&text);
}
void paint (cairo_t cr, &text_t text) {
for (int i = text.top; i < dim(text.layout) && i < text.top + text.lines; i++) {
move_to (cr, 0, (i - text.top) * text.font_extents.height + text.font_extents.ascent);
set_source_rgba (cr, text.color.red, text.color.green,
text.color.blue, text.color.alpha);
show_text(cr, String::substr(text.text, text.layout[i].pos, text.layout[i].len));
}
}
public void insert(&text_t text, int pos, string s) {
text.text = String::substr(text.text, 0, pos) +
s + String::substr(text.text, pos, String::length(text.text) - pos);
text.dirty = true;
Widget::redraw(&text);
}
public void delete(&text_t text, int pos, int n) {
n = min (n, String::length(text.text) - pos);
text.text = String::substr(text.text, 0, pos) +
String::substr(text.text, pos + n, String::length(text.text) - (pos + n));
text.dirty = true;
Widget::redraw(&text);
}
public bool scroll_up(&text_t text) {
if (text.top > 0) {
text.top--;
Widget::redraw(&text);
return true;
}
return false;
}
public bool scroll_down(&text_t text) {
if (text.top < dim(text.layout) - text.lines) {
text.top++;
Widget::redraw(&text);
return true;
}
return false;
}
void draw(cairo_t cr, &text_t text) {
prep(cr, &text);
paint(cr, &text);
}
void natural(cairo_t cr, &text_t text) {
prep(cr, &text);
rectangle(cr, 0, 0, 200, 200);
}
void outline(cairo_t cr, &text_t text) {
natural(cr, &text);
}
void print(&text_t text, int indent) {
do_indent(indent);
printf("text %s\n", text.text);
}
public void init (&text_t text, &nichrome_t nichrome) {
Widget::init(&nichrome, &text);
text.text = "";
text.dirty = true;
text.old_width = 0;
text.draw = draw;
text.top = 0;
text.outline = outline;
text.natural = natural;
text.font = Widget::default_font;
text.color = (rgba_color_t) {
red = 0, green = 0, blue = 0, alpha = 1
};
text.print = print;
}
public *Scrollbar::scrollbar_t scrollbar(&text_t text) {
if (is_uninit(&text.scrollbar)) {
void scrollbar_callback(&widget_t scroll, Scrollbar::action_t action) {
union switch (action) {
case drag pos:
text.top = floor (pos * dim(text.layout) + 0.5);
set_scroll(&text);
Widget::redraw(&text);
break;
case pos pos:
break;
default:
break;
}
}
text.scrollbar = Scrollbar::new(&text.nichrome,
Scrollbar::dir_t.vertical,
scrollbar_callback);
}
return text.scrollbar;
}
public *widget_t new (&nichrome_t nichrome) {
*text_t text = &(text_t) {};
init(text, &nichrome);
return text;
}
}
}
|