Add it here.

2006-05-11  Matthias Clasen  <mclasen@redhat.com>

	* demos/gtk-demo/Makefile.am (demos): Add it here.

	* demos/gtk-demo/printing.c (do_printing): Add a GtkPrintOperation demo.

2 files changed, 183 insertions, 0 deletions

diff --git a/demos/gtk-demo/Makefile.am b/demos/gtk-demo/Makefile.am
index f51fdacd68..e1adb57b63 100644
--- a/demos/gtk-demo/Makefile.am
+++ b/demos/gtk-demo/Makefile.am
@@ -26,6 +26,7 @@ demos =						\
 	panes.c					\
 	pickers.c				\
 	pixbufs.c				\
+	printing.c				\
 	rotated_text.c				\
 	sizegroup.c				\
 	stock_browser.c				\
diff --git a/demos/gtk-demo/printing.c b/demos/gtk-demo/printing.c
new file mode 100644
index 0000000000..9940d3351b
--- /dev/null
+++ b/demos/gtk-demo/printing.c
@@ -0,0 +1,182 @@
+/* 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_nr_of_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);
+  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_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_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_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;
+}