tut_ex30.c

Defining a table using dynamic callbacks

 
#include "dlfcn.h"
#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"
#pragma GCC diagnostic ignored "-Wunused-function"
#endif
 
char *
cb_date(void *tag, size_t r, size_t c) {
    static char buf[64];
    if ( ! run_as_unit_test ) {
        time_t t = time(NULL);
        ctime_r(&t, buf);
        return buf;
    } else {
        return "Wed May 4 19:01:01 2022";
    }
}
 
char *
cb_content(void *tag, size_t r, size_t c) {
    static char buf[32];
    snprintf(buf, sizeof buf, "Content %02zu x %02zu", r, c);
    return buf;
}
 
char *
cb_labels(void *tag, size_t r, size_t c) {
    static char buf[32];
    if (0==r && 0==c) {
        snprintf(buf, sizeof buf, "Date created:");
    } else {
        snprintf(buf, sizeof buf, "Label %zux%zu:", r, c);
    }
    return buf;
}
 
#ifndef _MSC_VER
#pragma GCC diagnostic pop
#endif
 
void
create_table_ex30(HPDF_Doc pdf_doc, HPDF_Page pdf_page) {
    const size_t num_rows = 2;
    const size_t num_cols = 2;
 
    char *table_title = "tut_ex30: Table with dynamic callbacks";
    hpdftbl_t tbl = hpdftbl_create_title(num_rows, num_cols, table_title);
    hpdftbl_use_labels(tbl, TRUE);
    hpdftbl_use_labelgrid(tbl, TRUE);
 
    hpdftbl_set_content_dyncb(tbl, "cb_content");
    hpdftbl_set_label_dyncb(tbl, "cb_labels");
    hpdftbl_set_cell_content_dyncb(tbl, 0, 0, "cb_date");
 
    HPDF_REAL xpos = hpdftbl_cm2dpi(1);
    HPDF_REAL ypos = hpdftbl_cm2dpi(A4PAGE_HEIGHT_CM - 1);
    HPDF_REAL width = hpdftbl_cm2dpi(12);
    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_ex30, FALSE)