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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
1 changed files with 30 additions and 15 deletions
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25
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 mmd_t *mmd_walk_next(mmd_t *top, mmd_t *node);
static void new_page(docdata_t *dd); static void new_page(docdata_t *dd);
static ssize_t output_cb(void *output_cbdata, const void *buffer, size_t bytes); 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 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_color(docdata_t *dd, doccolor_t color);
static void set_font(docdata_t *dd, docfont_t font, double fsize); 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 wswidth, // Width of whitespace
margin_left, // Left margin margin_left, // Left margin
margin_top, // Top margin margin_top, // Top margin
need_bottom, // Space needed after this block
height, // Height of current fragment height, // Height of current fragment
lineheight; // Height of current line lineheight; // Height of current line
@@ -551,6 +552,11 @@ format_block(docdata_t *dd, // I - Document data
else else
margin_top = fsize * LINE_HEIGHT; margin_top = fsize * LINE_HEIGHT;
if (mmdGetNextSibling(block))
need_bottom = 3.0 * SIZE_BODY * LINE_HEIGHT;
else
need_bottom = 0.0;
if (leader) if (leader)
{ {
// Add leader text on first line... // Add leader text on first line...
@@ -620,7 +626,7 @@ format_block(docdata_t *dd, // I - Document data
else else
margin_left = 0.0; 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) if (deffont == DOCFONT_ITALIC)
{ {
@@ -639,6 +645,7 @@ format_block(docdata_t *dd, // I - Document data
x = left; x = left;
lineheight = 0.0; lineheight = 0.0;
margin_top = 0.0; margin_top = 0.0;
need_bottom = 0.0;
continue; continue;
} }
@@ -688,7 +695,7 @@ format_block(docdata_t *dd, // I - Document data
else else
margin_left = 0.0; 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) if (deffont == DOCFONT_ITALIC)
{ {
@@ -707,6 +714,7 @@ format_block(docdata_t *dd, // I - Document data
x = left; x = left;
lineheight = 0.0; lineheight = 0.0;
margin_top = 0.0; margin_top = 0.0;
need_bottom = 0.0;
} }
// Add the current node to the fragment list // Add the current node to the fragment list
@@ -743,7 +751,7 @@ format_block(docdata_t *dd, // I - Document data
else else
margin_left = 0.0; 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) if (deffont == DOCFONT_ITALIC)
{ {
@@ -820,6 +828,7 @@ format_code(docdata_t *dd, // I - Document data
// End the current text block... // End the current text block...
pdfioContentTextEnd(dd->st); pdfioContentTextEnd(dd->st);
dd->y += lineheight;
} }
@@ -859,6 +868,11 @@ format_doc(docdata_t *dd, // I - Document data
default : default :
break; break;
case MMD_TYPE_THEMATIC_BREAK :
// Force a page break
dd->y = dd->art_box.y1;
break;
case MMD_TYPE_BLOCK_QUOTE : case MMD_TYPE_BLOCK_QUOTE :
format_doc(dd, current, DOCFONT_ITALIC, left + 36.0, right - 36.0); format_doc(dd, current, DOCFONT_ITALIC, left + 36.0, right - 36.0);
break; break;
@@ -1381,6 +1395,7 @@ static void
render_line(docdata_t *dd, // I - Document data render_line(docdata_t *dd, // I - Document data
double margin_left, // I - Left margin double margin_left, // I - Left margin
double margin_top, // I - Top margin double margin_top, // I - Top margin
double need_bottom, // I - How much space is needed after
double lineheight, // I - Height of line double lineheight, // I - Height of line
size_t num_frags, // I - Number of line fragments size_t num_frags, // I - Number of line fragments
linefrag_t *frags) // I - 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; 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); new_page(dd);