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/*
* 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"
#include "frame.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);
}
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