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/* Printing
*
* GtkPrintOperation offers a simple API to support printing
* in a cross-platform way.
*
*/
#include <math.h>
#include <gtk/gtk.h>
#include "demo-common.h"
/* In points */
#define HEADER_HEIGHT (10*72/25.4)
#define HEADER_GAP (3*72/25.4)
typedef struct
{
gchar *filename;
gdouble font_size;
gint lines_per_page;
gchar **lines;
gint num_lines;
gint num_pages;
} PrintData;
static void
begin_print (GtkPrintOperation *operation,
GtkPrintContext *context,
gpointer user_data)
{
PrintData *data = (PrintData *)user_data;
char *contents;
int i;
double height;
height = gtk_print_context_get_height (context) - HEADER_HEIGHT - HEADER_GAP;
data->lines_per_page = floor (height / data->font_size);
g_file_get_contents (data->filename, &contents, NULL, NULL);
data->lines = g_strsplit (contents, "\n", 0);
g_free (contents);
i = 0;
while (data->lines[i] != NULL)
i++;
data->num_lines = i;
data->num_pages = (data->num_lines - 1) / data->lines_per_page + 1;
gtk_print_operation_set_n_pages (operation, data->num_pages);
}
static void
draw_page (GtkPrintOperation *operation,
GtkPrintContext *context,
gint page_nr,
gpointer user_data)
{
PrintData *data = (PrintData *)user_data;
cairo_t *cr;
PangoLayout *layout;
gdouble width, text_height;
gint line, i, layout_height;
PangoFontDescription *desc;
gchar *page_str;
cr = gtk_print_context_get_cairo_context (context);
width = gtk_print_context_get_width (context);
cairo_rectangle (cr, 0, 0, width, HEADER_HEIGHT);
cairo_set_source_rgb (cr, 0.8, 0.8, 0.8);
cairo_fill_preserve (cr);
cairo_set_source_rgb (cr, 0, 0, 0);
cairo_set_line_width (cr, 1);
cairo_stroke (cr);
layout = gtk_print_context_create_pango_layout (context);
desc = pango_font_description_from_string ("sans 14");
pango_layout_set_font_description (layout, desc);
pango_font_description_free (desc);
pango_layout_set_text (layout, data->filename, -1);
pango_layout_set_width (layout, width);
pango_layout_set_alignment (layout, PANGO_ALIGN_CENTER);
pango_layout_get_size (layout, NULL, &layout_height);
text_height = (gdouble)layout_height / PANGO_SCALE;
cairo_move_to (cr, width / 2, (HEADER_HEIGHT - text_height) / 2);
pango_cairo_show_layout (cr, layout);
page_str = g_strdup_printf ("%d/%d", page_nr + 1, data->num_pages);
pango_layout_set_text (layout, page_str, -1);
g_free (page_str);
pango_layout_set_alignment (layout, PANGO_ALIGN_RIGHT);
cairo_move_to (cr, width - 2, (HEADER_HEIGHT - text_height) / 2);
pango_cairo_show_layout (cr, layout);
g_object_unref (layout);
layout = gtk_print_context_create_pango_layout (context);
desc = pango_font_description_from_string ("mono");
pango_font_description_set_size (desc, data->font_size * PANGO_SCALE);
pango_layout_set_font_description (layout, desc);
pango_font_description_free (desc);
cairo_move_to (cr, 0, HEADER_HEIGHT + HEADER_GAP);
line = page_nr * data->lines_per_page;
for (i = 0; i < data->lines_per_page && line < data->num_lines; i++)
{
pango_layout_set_text (layout, data->lines[line], -1);
pango_cairo_show_layout (cr, layout);
cairo_rel_move_to (cr, 0, data->font_size);
line++;
}
g_object_unref (layout);
}
static void
end_print (GtkPrintOperation *operation,
GtkPrintContext *context,
gpointer user_data)
{
PrintData *data = (PrintData *)user_data;
g_free (data->filename);
g_strfreev (data->lines);
g_free (data);
}
GtkWidget *
do_printing (GtkWidget *do_widget)
{
GtkPrintOperation *operation;
PrintData *data;
GError *error = NULL;
operation = gtk_print_operation_new ();
data = g_new0 (PrintData, 1);
data->filename = demo_find_file ("printing.c", NULL);
data->font_size = 12.0;
g_signal_connect (G_OBJECT (operation), "begin-print",
G_CALLBACK (begin_print), data);
g_signal_connect (G_OBJECT (operation), "draw-page",
G_CALLBACK (draw_page), data);
g_signal_connect (G_OBJECT (operation), "end-print",
G_CALLBACK (end_print), data);
gtk_print_operation_run (operation, GTK_PRINT_OPERATION_ACTION_PRINT_DIALOG, GTK_WINDOW (do_widget), &error);
g_object_unref (operation);
if (error)
{
GtkWidget *dialog;
dialog = gtk_message_dialog_new (GTK_WINDOW (do_widget),
GTK_DIALOG_DESTROY_WITH_PARENT,
GTK_MESSAGE_ERROR,
GTK_BUTTONS_CLOSE,
"%s", error->message);
g_error_free (error);
g_signal_connect (dialog, "response",
G_CALLBACK (gtk_widget_destroy), NULL);
gtk_widget_show (dialog);
}
return NULL;
}
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