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Add "need_bottom" argument to keep the following block on the same page.

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Michael R Sweet 2024-12-15 18:17:31 -05:00
parent 9020e92928
commit f8639fbd64
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GPG Key ID: BE67C75EC81F3244
1 changed files with 30 additions and 15 deletions
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45
examples/md2pdf.c
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@ -238,7 +238,7 @@ static double measure_cell(docdata_t *dd, mmd_t *cell, tablecol_t *col);
static mmd_t *mmd_walk_next(mmd_t *top, mmd_t *node);
static void new_page(docdata_t *dd);
static ssize_t output_cb(void *output_cbdata, const void *buffer, size_t bytes);
static void render_line(docdata_t *dd, double margin_left, double margin_top, double lineheight, size_t num_frags, linefrag_t *frags);
static void render_line(docdata_t *dd, double margin_left, double margin_top, double need_bottom, double lineheight, size_t num_frags, linefrag_t *frags);
static void render_row(docdata_t *dd, size_t num_cols, tablecol_t *cols, tablerow_t *row);
static void set_color(docdata_t *dd, doccolor_t color);
static void set_font(docdata_t *dd, docfont_t font, double fsize);
@ -540,6 +540,7 @@ format_block(docdata_t *dd, // I - Document data
wswidth, // Width of whitespace
margin_left, // Left margin
margin_top, // Top margin
need_bottom, // Space needed after this block
height, // Height of current fragment
lineheight; // Height of current line
@ -551,6 +552,11 @@ format_block(docdata_t *dd, // I - Document data
else
margin_top = fsize * LINE_HEIGHT;
if (mmdGetNextSibling(block))
need_bottom = 3.0 * SIZE_BODY * LINE_HEIGHT;
else
need_bottom = 0.0;
if (leader)
{
// Add leader text on first line...
@ -620,7 +626,7 @@ format_block(docdata_t *dd, // I - Document data
else
margin_left = 0.0;
render_line(dd, margin_left, margin_top, lineheight, num_frags, frags);
render_line(dd, margin_left, margin_top, need_bottom, lineheight, num_frags, frags);
if (deffont == DOCFONT_ITALIC)
{
@ -634,11 +640,12 @@ format_block(docdata_t *dd, // I - Document data
pdfioContentRestore(dd->st);
}
num_frags = 0;
frag = frags;
x = left;
lineheight = 0.0;
margin_top = 0.0;
num_frags = 0;
frag = frags;
x = left;
lineheight = 0.0;
margin_top = 0.0;
need_bottom = 0.0;
continue;
}
@ -688,7 +695,7 @@ format_block(docdata_t *dd, // I - Document data
else
margin_left = 0.0;
render_line(dd, margin_left, margin_top, lineheight, num_frags, frags);
render_line(dd, margin_left, margin_top, need_bottom, lineheight, num_frags, frags);
if (deffont == DOCFONT_ITALIC)
{
@ -702,11 +709,12 @@ format_block(docdata_t *dd, // I - Document data
pdfioContentRestore(dd->st);
}
num_frags = 0;
frag = frags;
x = left;
lineheight = 0.0;
margin_top = 0.0;
num_frags = 0;
frag = frags;
x = left;
lineheight = 0.0;
margin_top = 0.0;
need_bottom = 0.0;
}
// Add the current node to the fragment list
@ -743,7 +751,7 @@ format_block(docdata_t *dd, // I - Document data
else
margin_left = 0.0;
render_line(dd, margin_left, margin_top, lineheight, num_frags, frags);
render_line(dd, margin_left, margin_top, need_bottom, lineheight, num_frags, frags);
if (deffont == DOCFONT_ITALIC)
{
@ -820,6 +828,7 @@ format_code(docdata_t *dd, // I - Document data
// End the current text block...
pdfioContentTextEnd(dd->st);
dd->y += lineheight;
}
@ -859,6 +868,11 @@ format_doc(docdata_t *dd, // I - Document data
default :
break;
case MMD_TYPE_THEMATIC_BREAK :
// Force a page break
dd->y = dd->art_box.y1;
break;
case MMD_TYPE_BLOCK_QUOTE :
format_doc(dd, current, DOCFONT_ITALIC, left + 36.0, right - 36.0);
break;
@ -1381,6 +1395,7 @@ static void
render_line(docdata_t *dd, // I - Document data
double margin_left, // I - Left margin
double margin_top, // I - Top margin
double need_bottom, // I - How much space is needed after
double lineheight, // I - Height of line
size_t num_frags, // I - Number of line fragments
linefrag_t *frags) // I - Line fragments
@ -1397,7 +1412,7 @@ render_line(docdata_t *dd, // I - Document data
}
dd->y -= margin_top + lineheight;
if ((dd->y - (margin_top > 0.0 ? lineheight : 0.0)) < dd->art_box.y1)
if ((dd->y - need_bottom) < dd->art_box.y1)
{
new_page(dd);