tests/testprintfileoperation.c

   1 #include <pango/pangocairo.h>
   2 #include <gtk/gtk.h>
   3 #include <math.h>
   4 #include "testprintfileoperation.h"
   5
   6 /* In points */
   7 #define HEADER_HEIGHT (10*72/25.4)
   8 #define HEADER_GAP (3*72/25.4)
   9
  10 G_DEFINE_TYPE (TestPrintFileOperation, test_print_file_operation, GTK_TYPE_PRINT_OPERATION)
  11
  12 static void
  13 test_print_file_operation_finalize (GObject *object)
  14 {
  15   TestPrintFileOperation *op = TEST_PRINT_FILE_OPERATION (object);
  16
  17   g_free (op->filename);
  18
  19   G_OBJECT_CLASS (test_print_file_operation_parent_class)->finalize (object);
  20 }
  21
  22 static void
  23 test_print_file_operation_init (TestPrintFileOperation *operation)
  24 {
  25   gtk_print_operation_set_unit (GTK_PRINT_OPERATION (operation), GTK_UNIT_POINTS);
  26   operation->font_size = 14.0;
  27 }
  28
  29 TestPrintFileOperation *
  30 test_print_file_operation_new (const char *filename)
  31 {
  32   TestPrintFileOperation *op;
  33
  34   op = g_object_new (TEST_TYPE_PRINT_FILE_OPERATION, NULL);
  35
  36   op->filename = g_strdup (filename);
  37
  38   return op;
  39 }
  40
  41 void
  42 test_print_file_operation_set_font_size (TestPrintFileOperation *op,
  43                                          double points)
  44 {
  45   op->font_size = points;
  46 }
  47
  48 static void
  49 test_print_file_operation_begin_print (GtkPrintOperation *operation, GtkPrintContext *context)
  50 {
  51   TestPrintFileOperation *op = TEST_PRINT_FILE_OPERATION (operation);
  52   char *contents;
  53   int i;
  54   double height;
  55
  56   height = gtk_print_context_get_height (context) - HEADER_HEIGHT - HEADER_GAP;
  57
  58   op->lines_per_page = floor (height / op->font_size);
  59
  60   g_file_get_contents (op->filename,
  61                        &contents,
  62                        NULL, NULL);
  63
  64   op->lines = g_strsplit (contents, "\n", 0);
  65   g_free (contents);
  66
  67   i = 0;
  68   while (op->lines[i] != NULL)
  69     i++;
  70
  71   op->num_lines = i;
  72   op->num_pages = (op->num_lines - 1) / op->lines_per_page + 1;
  73   gtk_print_operation_set_n_pages (operation, op->num_pages);
  74 }
  75
  76 static void
  77 test_print_file_operation_draw_page (GtkPrintOperation *operation,
  78                                      GtkPrintContext *context,
  79                                      int page_nr)
  80 {
  81   cairo_t *cr;
  82   PangoLayout *layout;
  83   TestPrintFileOperation *op = TEST_PRINT_FILE_OPERATION (operation);
  84   double width, text_height;
  85   int line, i, layout_height;
  86   PangoFontDescription *desc;
  87   char *page_str;
  88
  89   cr = gtk_print_context_get_cairo_context (context);
  90   width = gtk_print_context_get_width (context);
  91
  92   cairo_rectangle (cr, 0, 0, width, HEADER_HEIGHT);
  93
  94   cairo_set_source_rgb (cr, 0.8, 0.8, 0.8);
  95   cairo_fill_preserve (cr);
  96
  97   cairo_set_source_rgb (cr, 0, 0, 0);
  98   cairo_set_line_width (cr, 1);
  99   cairo_stroke (cr);
 100
 101   layout = gtk_print_context_create_pango_layout (context);
 102
 103   desc = pango_font_description_from_string ("sans 14");
 104   pango_layout_set_font_description (layout, desc);
 105   pango_font_description_free (desc);
 106
 107   pango_layout_set_text (layout, op->filename, -1);
 108   pango_layout_set_width (layout, width);
 109   pango_layout_set_alignment (layout, PANGO_ALIGN_CENTER);
 110
 111   pango_layout_get_size (layout, NULL, &layout_height);
 112   text_height = (double)layout_height / PANGO_SCALE;
 113
 114   cairo_move_to (cr, width / 2,  (HEADER_HEIGHT - text_height) / 2);
 115   pango_cairo_show_layout (cr, layout);
 116
 117   page_str = g_strdup_printf ("%d/%d", page_nr + 1, op->num_pages);
 118   pango_layout_set_text (layout, page_str, -1);
 119   g_free (page_str);
 120   pango_layout_set_alignment (layout, PANGO_ALIGN_RIGHT);
 121
 122   cairo_move_to (cr, width - 2, (HEADER_HEIGHT - text_height) / 2);
 123   pango_cairo_show_layout (cr, layout);
 124
 125   g_object_unref (layout);
 126
 127   layout = gtk_print_context_create_pango_layout (context);
 128
 129   desc = pango_font_description_from_string ("mono");
 130   pango_font_description_set_size (desc, op->font_size * PANGO_SCALE);
 131   pango_layout_set_font_description (layout, desc);
 132   pango_font_description_free (desc);
 133
 134   cairo_move_to (cr, 0, HEADER_HEIGHT + HEADER_GAP);
 135   line = page_nr * op->lines_per_page;
 136   for (i = 0; i < op->lines_per_page && line < op->num_lines; i++, line++) {
 137     pango_layout_set_text (layout, op->lines[line], -1);
 138     pango_cairo_show_layout (cr, layout);
 139     cairo_rel_move_to (cr, 0, op->font_size);
 140   }
 141
 142   g_object_unref (layout);
 143 }
 144
 145 static void
 146 test_print_file_operation_end_print (GtkPrintOperation *operation, GtkPrintContext *context)
 147 {
 148   TestPrintFileOperation *op = TEST_PRINT_FILE_OPERATION (operation);
 149   g_strfreev (op->lines);
 150 }
 151
 152 static void
 153 test_print_file_operation_class_init (TestPrintFileOperationClass *class)
 154 {
 155   GObjectClass *gobject_class = (GObjectClass *)class;
 156   GtkPrintOperationClass *print_class = (GtkPrintOperationClass *)class;
 157
 158   gobject_class->finalize = test_print_file_operation_finalize;
 159   print_class->begin_print = test_print_file_operation_begin_print;
 160   print_class->draw_page = test_print_file_operation_draw_page;
 161   print_class->end_print = test_print_file_operation_end_print;
 162
 163 }