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
|
/*
* layout.c
*
* Colloquium - A tiny presentation program
*
* Copyright (c) 2012 Thomas White <taw@bitwiz.org.uk>
*
* 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/>.
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include "presentation.h"
#include "layout.h"
#include "stylesheet.h"
static void copy_lop_from_style(struct frame *fr, struct style *style)
{
if ( style == NULL ) return; /* Not dictated by style sheet */
memcpy(&fr->lop, &style->lop, sizeof(struct layout_parameters));
}
static void layout_subframe(struct frame *fr, double w, double h,
PangoContext *pc)
{
int i;
fr->w = w;
fr->h = h;
for ( i=0; i<fr->num_ro; i++ ) {
struct frame *child;
double child_w, child_h;
double offs_x, offs_y;
PangoFontDescription *fontdesc;
PangoRectangle extents;
child = fr->rendering_order[i];
if ( child == fr ) continue;
copy_lop_from_style(child, child->style);
/* First, calculate the region inside which the child frame must
* fit, having excluded the padding of its parent and its own
* margins. */
offs_x = child->lop.margin_l + fr->lop.pad_l;
offs_y = child->lop.margin_t + fr->lop.pad_r;
child_w = w - (child->lop.margin_l + child->lop.margin_r);
child_h = h - (child->lop.margin_t + child->lop.margin_b);
child_w -= (fr->lop.pad_l + fr->lop.pad_r);
child_h -= (fr->lop.pad_t + fr->lop.pad_b);
/* Put the contents inside, and see how much space is needed */
if ( child->pl == NULL ) {
child->pl = pango_layout_new(pc);
pango_layout_set_justify(child->pl, 1);
pango_layout_set_ellipsize(child->pl, 1);
}
pango_layout_set_width(child->pl, child_w*PANGO_SCALE);
pango_layout_set_height(child->pl, child_h*PANGO_SCALE);
/* FIXME: Check for Level 1 markup e.g. image */
pango_layout_set_text(child->pl, child->sc, -1);
fontdesc = pango_font_description_from_string("Sans 12");
pango_layout_set_font_description(child->pl, fontdesc);
pango_font_description_free(fontdesc);
pango_layout_get_extents(child->pl, NULL, &extents);
child_w = extents.width / PANGO_SCALE;
child_h = extents.height / PANGO_SCALE;
/* Now, apply the minimum size if given */
if ( child->lop.min_w > 0.0 ) {
if ( child_w < child->lop.min_w ) {
child_w = child->lop.min_w;
}
}
if ( child->lop.min_h > 0.0 ) {
if ( child_h < child->lop.min_h ) {
child_h = child->lop.min_h;
}
}
/* Finally, apply the gravity */
switch ( child->lop.grav )
{
case DIR_NONE :
break;
case DIR_UL :
case DIR_U :
case DIR_UR :
case DIR_R :
case DIR_DR :
case DIR_D :
case DIR_DL :
case DIR_L :
break;
}
/* Record values and recurse */
child->offs_x = offs_x;
child->offs_y = offs_y;
layout_subframe(child, child_w, child_h, pc);
}
}
void layout_frame(struct frame *fr, double w, double h, PangoContext *pc)
{
copy_lop_from_style(fr, fr->style);
layout_subframe(fr, w, h, pc);
}
|
