tut_ex09.c

Adjusting font style with a callback.

 
#include "unit_test.inc.h"
 
#ifndef _MSC_VER
// Silent gcc about unused "arg" in the callback and error functions
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-parameter"
#pragma GCC diagnostic ignored "-Wformat-nonliteral"
#endif
 
_Bool
cb_style(void *tag, size_t r, size_t c, char *content, hpdf_text_style_t *style) {
    // Format the header row/column with a grey background and Helvetica font while the rest of the
    // table uses "Times Roman"
    if( 0==r || 0==c ) { // Headers
        style->font = HPDF_FF_HELVETICA_BOLD;
        style->fsize = 12;
        style->color = HPDF_COLOR_BLACK;
        style->background = HPDF_COLOR_LIGHT_GRAY;
        if ( c > 0 )
            style->halign = CENTER;
        else
            style->halign = LEFT;
    } else { // Content
        style->font = HPDF_FF_TIMES;
        style->fsize = 11;
        style->color = HPDF_COLOR_BLACK;
        style->background = HPDF_COLOR_WHITE;
        style->halign = CENTER;
    }
    return TRUE;
}
 
static char *
cb_content(void *tag, size_t r, size_t c) {
    static char buf[64];
    if( 0==r && 0==c ) return NULL;
 
    if( 0==c ) {
#if (defined _WIN32 || defined __WIN32__)
        snprintf(buf, sizeof buf, "Extra long Header %2ix%2i", r, c);
#else
        snprintf(buf, sizeof buf, "Extra long Header %zux%zu", r, c);
#endif
    } else if( 0==r ) {
#if (defined _WIN32 || defined __WIN32__)
        snprintf(buf, sizeof buf, "Header %2ix%2i", r, c);
#else
        snprintf(buf, sizeof buf, "Header %zux%zu", r, c);
#endif
    } else {
#if (defined _WIN32 || defined __WIN32__)
        snprintf(buf, sizeof buf, "Content %2ix%2i", r, c);
#else
        snprintf(buf, sizeof buf, "Content %zux%zu", r, c);
#endif
    }
    return buf;
}
 
#ifndef _MSC_VER
#pragma GCC diagnostic pop
#endif
 
void
create_table_ex09(HPDF_Doc pdf_doc, HPDF_Page pdf_page) {
    const size_t num_rows = 4;
    const size_t num_cols = 4;
 
    hpdftbl_t tbl = hpdftbl_create(num_rows, num_cols);
 
    hpdftbl_set_content_cb(tbl, cb_content);
    hpdftbl_set_content_style_cb(tbl, cb_style);
 
    hpdftbl_set_colwidth_percent(tbl, 0, 40);
 
    HPDF_REAL xpos = hpdftbl_cm2dpi(1);
    HPDF_REAL ypos = hpdftbl_cm2dpi(A4PAGE_HEIGHT_CM - 1);
    HPDF_REAL width = hpdftbl_cm2dpi(A4PAGE_WIDTH_CM - 4);
    HPDF_REAL height = 0;  // Calculate height automatically
 
    // Stroke the table to the page
    hpdftbl_stroke(pdf_doc, pdf_page, tbl, xpos, ypos, width, height);
}
 
TUTEX_MAIN(create_table_ex09, FALSE)