pintos-os.org Git - pspp/blob - src/ui/gui/psppire-output-view.c

   1 /* PSPPIRE - a graphical user interface for PSPP.
   2    Copyright (C) 2008-2015 Free Software Foundation.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation, either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <http://www.gnu.org/licenses/>. */
  16
  17 #include <config.h>
  18
  19 #include "ui/gui/psppire-output-view.h"
  20
  21 #include <errno.h>
  22 #include <stdbool.h>
  23
  24 #include "libpspp/assertion.h"
  25 #include "libpspp/string-map.h"
  26 #include "output/cairo.h"
  27 #include "output/driver-provider.h"
  28 #include "output/driver.h"
  29 #include "output/chart-item.h"
  30 #include "output/message-item.h"
  31 #include "output/output-item.h"
  32 #include "output/table-item.h"
  33 #include "output/text-item.h"
  34
  35 #include "gl/c-xvasprintf.h"
  36 #include "gl/minmax.h"
  37 #include "gl/tmpdir.h"
  38 #include "gl/xalloc.h"
  39
  40 #include <gettext.h>
  41 #define _(msgid) gettext (msgid)
  42
  43 struct output_view_item
  44   {
  45     struct output_item *item;
  46     GtkWidget *drawing_area;
  47   };
  48
  49 struct psppire_output_view
  50   {
  51     struct xr_driver *xr;
  52     int font_height;
  53
  54     GtkLayout *output;
  55     int render_width;
  56     int max_width;
  57     glong y;
  58
  59     struct string_map render_opts;
  60     GtkTreeView *overview;
  61     GtkTreeIter cur_command;
  62     bool in_command;
  63
  64     GtkWidget *toplevel;
  65
  66     struct output_view_item *items;
  67     size_t n_items, allocated_items;
  68
  69     /* Variables pertaining to printing */
  70     GtkPrintSettings *print_settings;
  71     struct xr_driver *print_xrd;
  72     int print_item;
  73     int print_n_pages;
  74     gboolean paginated;
  75   };
  76
  77 enum
  78   {
  79     COL_NAME,                   /* Table name. */
  80     COL_ADDR,                   /* Pointer to the table */
  81     COL_Y,                      /* Y position of top of name. */
  82     N_COLS
  83   };
  84
  85 static gboolean
  86 draw_callback (GtkWidget *widget, cairo_t *cr, gpointer data)
  87 {
  88   struct xr_rendering *r = g_object_get_data (G_OBJECT (widget), "rendering");
  89   xr_rendering_draw_all (r, cr);
  90   return TRUE;
  91 }
  92
  93 static void
  94 free_rendering (gpointer rendering_)
  95 {
  96   struct xr_rendering *rendering = rendering_;
  97   xr_rendering_destroy (rendering);
  98 }
  99
 100 static void
 101 create_xr (struct psppire_output_view *view)
 102 {
 103   struct text_item *text_item;
 104   PangoFontDescription *font_desc;
 105   struct xr_rendering *r;
 106   char *font_name;
 107   int font_width;
 108   cairo_t *cr;
 109   gchar *fgc;
 110
 111   GtkStyleContext *context = gtk_widget_get_style_context (GTK_WIDGET (view->output));
 112   GtkStateFlags state = gtk_widget_get_state_flags (GTK_WIDGET (view->output));
 113   GdkRGBA *fg_color;
 114
 115   gtk_style_context_get (context, state,
 116     "font", &font_desc, "color", &fg_color, NULL);
 117
 118   cr = gdk_cairo_create (gtk_widget_get_window (GTK_WIDGET (view->output)));
 119
 120   /* Set the widget's text color as the foreground color for the output driver */
 121   /* gdk_rgba_to_string() would be perfect, but xr's parse_color does not      */
 122   /* understand the rgb(255,128,33) format. Therefore we do it ourself.        */
 123   fgc = xasprintf("#%4x%4x%4x",(int)(fg_color->red*0xffff),
 124     (int)(fg_color->green*0xffff),(int)(fg_color->blue*0xffff));
 125   string_map_insert (&view->render_opts, "foreground-color", fgc);
 126   g_free (fgc);
 127   gdk_rgba_free (fg_color);
 128
 129   /* Use GTK+ default font as proportional font. */
 130   font_name = pango_font_description_to_string (font_desc);
 131   string_map_insert (&view->render_opts, "prop-font", font_name);
 132   g_free (font_name);
 133
 134   /* Derived emphasized font from proportional font. */
 135   pango_font_description_set_style (font_desc, PANGO_STYLE_ITALIC);
 136   font_name = pango_font_description_to_string (font_desc);
 137   string_map_insert (&view->render_opts, "emph-font", font_name);
 138   g_free (font_name);
 139   pango_font_description_free (font_desc);
 140
 141   /* Pretend that the "page" has a reasonable width and a very big length,
 142      so that most tables can be conveniently viewed on-screen with vertical
 143      scrolling only.  (The length should not be increased very much because
 144      it is already close enough to INT_MAX when expressed as thousands of a
 145      point.) */
 146   string_map_insert_nocopy (&view->render_opts, xstrdup ("paper-size"),
 147                             xasprintf ("%dx1000000pt", view->render_width));
 148   string_map_insert (&view->render_opts, "left-margin", "0");
 149   string_map_insert (&view->render_opts, "right-margin", "0");
 150   string_map_insert (&view->render_opts, "top-margin", "0");
 151   string_map_insert (&view->render_opts, "bottom-margin", "0");
 152
 153   view->xr = xr_driver_create (cr, &view->render_opts);
 154
 155   text_item = text_item_create (TEXT_ITEM_PARAGRAPH, "X");
 156   r = xr_rendering_create (view->xr, text_item_super (text_item), cr);
 157   xr_rendering_measure (r, &font_width, &view->font_height);
 158   text_item_unref (text_item);
 159
 160   cairo_destroy (cr);
 161 }
 162
 163 static void
 164 create_drawing_area (struct psppire_output_view *view,
 165                      GtkWidget *drawing_area, struct xr_rendering *r,
 166                      int tw, int th)
 167 {
 168   g_object_set_data_full (G_OBJECT (drawing_area),
 169                           "rendering", r, free_rendering);
 170
 171   g_signal_connect (drawing_area, "draw",
 172                     G_CALLBACK (draw_callback), view);
 173
 174   gtk_widget_set_size_request (drawing_area, tw, th);
 175   gtk_layout_put (view->output, drawing_area, 0, view->y);
 176
 177   gtk_widget_show (drawing_area);
 178 }
 179
 180 static void
 181 rerender (struct psppire_output_view *view)
 182 {
 183   struct output_view_item *item;
 184   cairo_t *cr;
 185
 186   if (!view->n_items || !gtk_widget_get_window (GTK_WIDGET (view->output)))
 187     return;
 188
 189   cr = gdk_cairo_create (gtk_widget_get_window (GTK_WIDGET (view->output)));
 190
 191   view->y = 0;
 192   view->max_width = 0;
 193   for (item = view->items; item < &view->items[view->n_items]; item++)
 194     {
 195       struct xr_rendering *r;
 196       GtkAllocation alloc;
 197       int tw, th;
 198
 199       if (view->y > 0)
 200         view->y += view->font_height / 2;
 201
 202       r = xr_rendering_create (view->xr, item->item, cr);
 203       if (r == NULL)
 204         {
 205           g_warn_if_reached ();
 206           continue;
 207         }
 208
 209       xr_rendering_measure (r, &tw, &th);
 210
 211       if (!item->drawing_area)
 212         {
 213           item->drawing_area = gtk_drawing_area_new ();
 214           create_drawing_area (view, item->drawing_area, r, tw, th);
 215         }
 216       else
 217         {
 218           g_object_set_data_full (G_OBJECT (item->drawing_area),
 219                                   "rendering", r, free_rendering);
 220           gtk_widget_set_size_request (item->drawing_area, tw, th);
 221           gtk_layout_move (view->output, item->drawing_area, 0, view->y);
 222         }
 223
 224       alloc.x = 0;
 225       alloc.y = view->y;
 226       alloc.width = tw;
 227       alloc.height = th;
 228       gtk_widget_size_allocate(item->drawing_area,&alloc);
 229
 230       if (view->max_width < tw)
 231         view->max_width = tw;
 232       view->y += th;
 233     }
 234
 235   gtk_layout_set_size (view->output, view->max_width, view->y);
 236   cairo_destroy (cr);
 237 }
 238
 239 void
 240 psppire_output_view_put (struct psppire_output_view *view,
 241                          const struct output_item *item)
 242 {
 243   struct output_view_item *view_item;
 244   GtkWidget *drawing_area;
 245   struct xr_rendering *r;
 246   struct string name;
 247   GtkTreeStore *store;
 248   cairo_t *cr = NULL;
 249   GtkTreePath *path;
 250   GtkTreeIter iter;
 251   int tw, th;
 252
 253   if (is_text_item (item))
 254     {
 255       const struct text_item *text_item = to_text_item (item);
 256       enum text_item_type type = text_item_get_type (text_item);
 257       const char *text = text_item_get_text (text_item);
 258
 259       if (type == TEXT_ITEM_COMMAND_CLOSE)
 260         {
 261           view->in_command = false;
 262           return;
 263         }
 264       else if (text[0] == '\0')
 265         return;
 266     }
 267
 268   if (view->n_items >= view->allocated_items)
 269     view->items = x2nrealloc (view->items, &view->allocated_items,
 270                                 sizeof *view->items);
 271   view_item = &view->items[view->n_items++];
 272   view_item->item = output_item_ref (item);
 273   view_item->drawing_area = NULL;
 274
 275   if (gtk_widget_get_window (GTK_WIDGET (view->output)))
 276     {
 277       view_item->drawing_area = drawing_area = gtk_drawing_area_new ();
 278
 279       cr = gdk_cairo_create (gtk_widget_get_window (GTK_WIDGET (view->output)));
 280       if (view->xr == NULL)
 281         create_xr (view);
 282
 283       if (view->y > 0)
 284         view->y += view->font_height / 2;
 285
 286       r = xr_rendering_create (view->xr, item, cr);
 287       if (r == NULL)
 288         goto done;
 289
 290       xr_rendering_measure (r, &tw, &th);
 291
 292       create_drawing_area (view, drawing_area, r, tw, th);
 293     }
 294   else
 295     tw = th = 0;
 296
 297   if (view->overview
 298       && (!is_text_item (item)
 299           || text_item_get_type (to_text_item (item)) != TEXT_ITEM_SYNTAX
 300           || !view->in_command))
 301     {
 302       store = GTK_TREE_STORE (gtk_tree_view_get_model (view->overview));
 303
 304       ds_init_empty (&name);
 305       if (is_text_item (item)
 306           && text_item_get_type (to_text_item (item)) == TEXT_ITEM_COMMAND_OPEN)
 307         {
 308           gtk_tree_store_append (store, &iter, NULL);
 309           view->cur_command = iter; /* XXX shouldn't save a GtkTreeIter */
 310           view->in_command = true;
 311         }
 312       else
 313         {
 314           GtkTreeIter *p = view->in_command ? &view->cur_command : NULL;
 315           gtk_tree_store_append (store, &iter, p);
 316         }
 317
 318       ds_clear (&name);
 319       if (is_text_item (item))
 320         ds_put_cstr (&name, text_item_get_text (to_text_item (item)));
 321       else if (is_message_item (item))
 322         {
 323           const struct message_item *msg_item = to_message_item (item);
 324           const struct msg *msg = message_item_get_msg (msg_item);
 325           ds_put_format (&name, "%s: %s", _("Message"),
 326                          msg_severity_to_string (msg->severity));
 327         }
 328       else if (is_table_item (item))
 329         {
 330           const char *title = table_item_get_title (to_table_item (item));
 331           if (title != NULL)
 332             ds_put_format (&name, "Table: %s", title);
 333           else
 334             ds_put_cstr (&name, "Table");
 335         }
 336       else if (is_chart_item (item))
 337         {
 338           const char *s = chart_item_get_title (to_chart_item (item));
 339           if (s != NULL)
 340             ds_put_format (&name, "Chart: %s", s);
 341           else
 342             ds_put_cstr (&name, "Chart");
 343         }
 344       gtk_tree_store_set (store, &iter,
 345                           COL_NAME, ds_cstr (&name),
 346                           COL_ADDR, item,
 347                           COL_Y, (view->y),
 348                           -1);
 349       ds_destroy (&name);
 350
 351       path = gtk_tree_model_get_path (GTK_TREE_MODEL (store), &iter);
 352       gtk_tree_view_expand_row (view->overview, path, TRUE);
 353       gtk_tree_path_free (path);
 354     }
 355
 356   if (view->max_width < tw)
 357     view->max_width = tw;
 358   view->y += th;
 359
 360   gtk_layout_set_size (view->output, view->max_width, view->y);
 361
 362 done:
 363   cairo_destroy (cr);
 364 }
 365
 366 static void
 367 on_row_activate (GtkTreeView *overview,
 368                  GtkTreePath *path,
 369                  GtkTreeViewColumn *column,
 370                  struct psppire_output_view *view)
 371 {
 372   GtkTreeModel *model;
 373   GtkTreeIter iter;
 374   GtkAdjustment *vadj;
 375   GValue value = {0};
 376   double y, min, max;
 377
 378   model = gtk_tree_view_get_model (overview);
 379   if (!gtk_tree_model_get_iter (model, &iter, path))
 380     return;
 381
 382   gtk_tree_model_get_value (model, &iter, COL_Y, &value);
 383   y = g_value_get_long (&value);
 384   g_value_unset (&value);
 385
 386   vadj = gtk_scrollable_get_vadjustment (GTK_SCROLLABLE (view->output));
 387   min = gtk_adjustment_get_lower (vadj);
 388   max = gtk_adjustment_get_upper (vadj) - gtk_adjustment_get_page_size (vadj);
 389   if (y < min)
 390     y = min;
 391   else if (y > max)
 392     y = max;
 393   gtk_adjustment_set_value (vadj, y);
 394 }
 395
 396 static void
 397 on_style_updated (GtkWidget *toplevel, struct psppire_output_view *view)
 398 {
 399   if (!view->n_items || !gtk_widget_get_window (GTK_WIDGET (view->output)))
 400     return;
 401   string_map_clear (&view->render_opts);
 402   xr_driver_destroy (view->xr);
 403   create_xr (view);
 404   rerender (view);
 405 }
 406
 407 enum {
 408   SELECT_FMT_NULL,
 409   SELECT_FMT_TEXT,
 410   SELECT_FMT_UTF8,
 411   SELECT_FMT_HTML,
 412   SELECT_FMT_ODT
 413 };
 414
 415 /* GNU Hurd doesn't have PATH_MAX.  Use a fallback.
 416    Temporary directory names are usually not that long.  */
 417 #ifndef PATH_MAX
 418 # define PATH_MAX 1024
 419 #endif
 420
 421 static void
 422 clipboard_get_cb (GtkClipboard     *clipboard,
 423                   GtkSelectionData *selection_data,
 424                   guint             info,
 425                   gpointer          data)
 426 {
 427   struct psppire_output_view *view = data;
 428
 429   gsize length;
 430   gchar *text = NULL;
 431   struct output_driver *driver = NULL;
 432   char dirname[PATH_MAX], *filename;
 433   struct string_map options;
 434
 435   GtkTreeSelection *sel = gtk_tree_view_get_selection (view->overview);
 436   GtkTreeModel *model = gtk_tree_view_get_model (view->overview);
 437
 438   GList *rows = gtk_tree_selection_get_selected_rows (sel, &model);
 439   GList *n = rows;
 440
 441   if ( n == NULL)
 442     return;
 443
 444   if (path_search (dirname, sizeof dirname, NULL, NULL, true)
 445       || mkdtemp (dirname) == NULL)
 446     {
 447       msg_error (errno, _("failed to create temporary directory during clipboard operation"));
 448       return;
 449     }
 450   filename = xasprintf ("%s/clip.tmp", dirname);
 451
 452   string_map_init (&options);
 453   string_map_insert (&options, "output-file", filename);
 454
 455   switch (info)
 456     {
 457     case SELECT_FMT_UTF8:
 458       string_map_insert (&options, "box", "unicode");
 459       /* fall-through */
 460
 461     case SELECT_FMT_TEXT:
 462       string_map_insert (&options, "format", "txt");
 463       break;
 464
 465     case SELECT_FMT_HTML:
 466       string_map_insert (&options, "format", "html");
 467       string_map_insert (&options, "borders", "false");
 468       string_map_insert (&options, "css", "false");
 469       break;
 470
 471     case SELECT_FMT_ODT:
 472       string_map_insert (&options, "format", "odt");
 473       break;
 474
 475     default:
 476       g_warning ("unsupported clip target\n");
 477       goto finish;
 478       break;
 479     }
 480
 481   driver = output_driver_create (&options);
 482   if (driver == NULL)
 483     goto finish;
 484
 485   while (n)
 486     {
 487       GtkTreePath *path = n->data ;
 488       GtkTreeIter iter;
 489       struct output_item *item ;
 490
 491       gtk_tree_model_get_iter (model, &iter, path);
 492       gtk_tree_model_get (model, &iter, COL_ADDR, &item, -1);
 493
 494       driver->class->submit (driver, item);
 495
 496       n = n->next;
 497     }
 498
 499   if ( driver->class->flush)
 500     driver->class->flush (driver);
 501
 502
 503   /* Some drivers (eg: the odt one) don't write anything until they
 504      are closed */
 505   output_driver_destroy (driver);
 506   driver = NULL;
 507
 508   if ( g_file_get_contents (filename, &text, &length, NULL) )
 509     {
 510       gtk_selection_data_set (selection_data, gtk_selection_data_get_target (selection_data),
 511                               8,
 512                               (const guchar *) text, length);
 513     }
 514
 515  finish:
 516
 517   if (driver != NULL)
 518     output_driver_destroy (driver);
 519
 520   g_free (text);
 521
 522   unlink (filename);
 523   free (filename);
 524   rmdir (dirname);
 525
 526   g_list_free (rows);
 527 }
 528
 529 static void
 530 clipboard_clear_cb (GtkClipboard *clipboard,
 531                     gpointer data)
 532 {
 533 }
 534
 535 static const GtkTargetEntry targets[] = {
 536
 537   { "STRING",        0, SELECT_FMT_TEXT },
 538   { "TEXT",          0, SELECT_FMT_TEXT },
 539   { "COMPOUND_TEXT", 0, SELECT_FMT_TEXT },
 540   { "text/plain",    0, SELECT_FMT_TEXT },
 541
 542   { "UTF8_STRING",   0, SELECT_FMT_UTF8 },
 543   { "text/plain;charset=utf-8", 0, SELECT_FMT_UTF8 },
 544
 545   { "text/html",     0, SELECT_FMT_HTML },
 546
 547   { "application/vnd.oasis.opendocument.text", 0, SELECT_FMT_ODT }
 548 };
 549
 550 static void
 551 on_copy (struct psppire_output_view *view)
 552 {
 553   GtkWidget *widget = GTK_WIDGET (view->overview);
 554   GtkClipboard *cb = gtk_widget_get_clipboard (widget, GDK_SELECTION_CLIPBOARD);
 555
 556   if (!gtk_clipboard_set_with_data (cb, targets, G_N_ELEMENTS (targets),
 557                                     clipboard_get_cb, clipboard_clear_cb,
 558                                     view))
 559     clipboard_clear_cb (cb, view);
 560 }
 561
 562 static void
 563 on_selection_change (GtkTreeSelection *sel, GtkAction *copy_action)
 564 {
 565   /* The Copy action is available only if there is something selected */
 566   gtk_action_set_sensitive (copy_action, gtk_tree_selection_count_selected_rows (sel) > 0);
 567 }
 568
 569 static void
 570 on_select_all (struct psppire_output_view *view)
 571 {
 572   GtkTreeSelection *sel = gtk_tree_view_get_selection (view->overview);
 573   gtk_tree_view_expand_all (view->overview);
 574   gtk_tree_selection_select_all (sel);
 575 }
 576
 577 static void
 578 on_size_allocate (GtkWidget    *widget,
 579                   GdkRectangle *allocation,
 580                   struct psppire_output_view *view)
 581 {
 582   int new_render_width = MAX (300, allocation->width);
 583
 584   if (view->render_width != new_render_width)
 585     {
 586       view->render_width = new_render_width;
 587       rerender (view);
 588     }
 589 }
 590
 591 struct psppire_output_view *
 592 psppire_output_view_new (GtkLayout *output, GtkTreeView *overview,
 593                          GtkAction *copy_action, GtkAction *select_all_action)
 594 {
 595   struct psppire_output_view *view;
 596   GtkTreeViewColumn *column;
 597   GtkCellRenderer *renderer;
 598   GtkTreeSelection *sel;
 599   GtkTreeModel *model;
 600
 601   view = xmalloc (sizeof *view);
 602   view->xr = NULL;
 603   view->font_height = 0;
 604   view->output = output;
 605   view->render_width = 0;
 606   view->max_width = 0;
 607   view->y = 0;
 608   string_map_init (&view->render_opts);
 609   view->overview = overview;
 610   memset (&view->cur_command, 0, sizeof view->cur_command);
 611   view->in_command = false;
 612   view->toplevel = gtk_widget_get_toplevel (GTK_WIDGET (output));
 613   view->items = NULL;
 614   view->n_items = view->allocated_items = 0;
 615   view->print_settings = NULL;
 616   view->print_xrd = NULL;
 617   view->print_item = 0;
 618   view->print_n_pages = 0;
 619   view->paginated = FALSE;
 620
 621   g_signal_connect (output, "style-updated", G_CALLBACK (on_style_updated), view);
 622
 623   g_signal_connect (output, "size-allocate", G_CALLBACK (on_size_allocate), view);
 624
 625   gtk_style_context_add_class (gtk_widget_get_style_context (GTK_WIDGET (output)),
 626                                GTK_STYLE_CLASS_VIEW);
 627
 628   if (overview)
 629     {
 630       model = GTK_TREE_MODEL (gtk_tree_store_new (
 631                                 N_COLS,
 632                                 G_TYPE_STRING,  /* COL_NAME */
 633                                 G_TYPE_POINTER, /* COL_ADDR */
 634                                 G_TYPE_LONG));  /* COL_Y */
 635       gtk_tree_view_set_model (overview, model);
 636       g_object_unref (model);
 637
 638       sel = gtk_tree_view_get_selection (overview);
 639       gtk_tree_selection_set_mode (sel, GTK_SELECTION_MULTIPLE);
 640       g_signal_connect (sel, "changed", G_CALLBACK (on_selection_change),
 641                         copy_action);
 642
 643       column = gtk_tree_view_column_new ();
 644       gtk_tree_view_append_column (GTK_TREE_VIEW (overview), column);
 645       renderer = gtk_cell_renderer_text_new ();
 646       gtk_tree_view_column_pack_start (column, renderer, TRUE);
 647       gtk_tree_view_column_add_attribute (column, renderer, "text", COL_NAME);
 648
 649       g_signal_connect (GTK_TREE_VIEW (overview),
 650                         "row-activated", G_CALLBACK (on_row_activate), view);
 651
 652       gtk_action_set_sensitive (copy_action, FALSE);
 653       g_signal_connect_swapped (copy_action, "activate",
 654                                 G_CALLBACK (on_copy), view);
 655       g_signal_connect_swapped (select_all_action, "activate",
 656                                 G_CALLBACK (on_select_all), view);
 657     }
 658
 659   return view;
 660 }
 661
 662 void
 663 psppire_output_view_destroy (struct psppire_output_view *view)
 664 {
 665   size_t i;
 666
 667   if (!view)
 668     return;
 669
 670   g_signal_handlers_disconnect_by_func (view->output,
 671                                         G_CALLBACK (on_style_updated), view);
 672
 673   string_map_destroy (&view->render_opts);
 674
 675   for (i = 0; i < view->n_items; i++)
 676     output_item_unref (view->items[i].item);
 677   free (view->items);
 678   view->items = NULL;
 679   view->n_items = view->allocated_items = 0;
 680
 681   if (view->print_settings != NULL)
 682     g_object_unref (view->print_settings);
 683
 684   xr_driver_destroy (view->xr);
 685
 686   free (view);
 687 }
 688
 689 void
 690 psppire_output_view_clear (struct psppire_output_view *view)
 691 {
 692   size_t i;
 693
 694   view->max_width = 0;
 695   view->y = 0;
 696
 697   for (i = 0; i < view->n_items; i++)
 698     {
 699       gtk_container_remove (GTK_CONTAINER (view->output),
 700                             view->items[i].drawing_area);
 701       output_item_unref (view->items[i].item);
 702     }
 703   free (view->items);
 704   view->items = NULL;
 705   view->n_items = view->allocated_items = 0;
 706 }
 707
 708 /* Export. */
 709
 710 void
 711 psppire_output_view_export (struct psppire_output_view *view,
 712                             struct string_map *options)
 713 {
 714   struct output_driver *driver;
 715
 716   driver = output_driver_create (options);
 717   if (driver)
 718     {
 719       size_t i;
 720
 721       for (i = 0; i < view->n_items; i++)
 722         driver->class->submit (driver, view->items[i].item);
 723       output_driver_destroy (driver);
 724     }
 725 }
 726 \f
 727 /* Print. */
 728
 729 static cairo_t *
 730 get_cairo_context_from_print_context (GtkPrintContext *context)
 731 {
 732   cairo_t *cr = gtk_print_context_get_cairo_context (context);
 733
 734   /*
 735     For all platforms except windows, gtk_print_context_get_dpi_[xy] returns 72.
 736     Windows returns 600.
 737   */
 738   double xres = gtk_print_context_get_dpi_x (context);
 739   double yres = gtk_print_context_get_dpi_y (context);
 740
 741   /* This means that the cairo context now has its dimensions in Points */
 742   cairo_scale (cr, xres / 72.0, yres / 72.0);
 743
 744   return cr;
 745 }
 746
 747
 748 static void
 749 create_xr_print_driver (GtkPrintContext *context, struct psppire_output_view *view)
 750 {
 751   struct string_map options;
 752   GtkPageSetup *page_setup;
 753   double width, height;
 754   double left_margin;
 755   double right_margin;
 756   double top_margin;
 757   double bottom_margin;
 758
 759   page_setup = gtk_print_context_get_page_setup (context);
 760   width = gtk_page_setup_get_paper_width (page_setup, GTK_UNIT_MM);
 761   height = gtk_page_setup_get_paper_height (page_setup, GTK_UNIT_MM);
 762   left_margin = gtk_page_setup_get_left_margin (page_setup, GTK_UNIT_MM);
 763   right_margin = gtk_page_setup_get_right_margin (page_setup, GTK_UNIT_MM);
 764   top_margin = gtk_page_setup_get_top_margin (page_setup, GTK_UNIT_MM);
 765   bottom_margin = gtk_page_setup_get_bottom_margin (page_setup, GTK_UNIT_MM);
 766
 767   string_map_init (&options);
 768   string_map_insert_nocopy (&options, xstrdup ("paper-size"),
 769                             c_xasprintf("%.2fx%.2fmm", width, height));
 770   string_map_insert_nocopy (&options, xstrdup ("left-margin"),
 771                             c_xasprintf ("%.2fmm", left_margin));
 772   string_map_insert_nocopy (&options, xstrdup ("right-margin"),
 773                             c_xasprintf ("%.2fmm", right_margin));
 774   string_map_insert_nocopy (&options, xstrdup ("top-margin"),
 775                             c_xasprintf ("%.2fmm", top_margin));
 776   string_map_insert_nocopy (&options, xstrdup ("bottom-margin"),
 777                             c_xasprintf ("%.2fmm", bottom_margin));
 778
 779   view->print_xrd = xr_driver_create (get_cairo_context_from_print_context (context), &options);
 780
 781   string_map_destroy (&options);
 782 }
 783
 784 static gboolean
 785 paginate (GtkPrintOperation *operation,
 786           GtkPrintContext   *context,
 787           struct psppire_output_view *view)
 788 {
 789   if (view->paginated)
 790     {
 791       /* Sometimes GTK+ emits this signal again even after pagination is
 792          complete.  Don't let that screw up printing. */
 793       return TRUE;
 794     }
 795   else if ( view->print_item < view->n_items )
 796     {
 797       xr_driver_output_item (view->print_xrd,
 798                              view->items[view->print_item++].item);
 799       while (xr_driver_need_new_page (view->print_xrd))
 800         {
 801           xr_driver_next_page (view->print_xrd, get_cairo_context_from_print_context (context));
 802           view->print_n_pages ++;
 803         }
 804       return FALSE;
 805     }
 806   else
 807     {
 808       gtk_print_operation_set_n_pages (operation, view->print_n_pages);
 809
 810       /* Re-create the driver to do the real printing. */
 811       xr_driver_destroy (view->print_xrd);
 812       create_xr_print_driver (context, view);
 813       view->print_item = 0;
 814       view->paginated = TRUE;
 815
 816       return TRUE;
 817     }
 818 }
 819
 820 static void
 821 begin_print (GtkPrintOperation *operation,
 822              GtkPrintContext   *context,
 823              struct psppire_output_view *view)
 824 {
 825   create_xr_print_driver (context, view);
 826
 827   view->print_item = 0;
 828   view->print_n_pages = 1;
 829   view->paginated = FALSE;
 830 }
 831
 832 static void
 833 end_print (GtkPrintOperation *operation,
 834            GtkPrintContext   *context,
 835            struct psppire_output_view *view)
 836 {
 837   xr_driver_destroy (view->print_xrd);
 838 }
 839
 840
 841 static void
 842 draw_page (GtkPrintOperation *operation,
 843            GtkPrintContext   *context,
 844            gint               page_number,
 845            struct psppire_output_view *view)
 846 {
 847   xr_driver_next_page (view->print_xrd, get_cairo_context_from_print_context (context));
 848   while (!xr_driver_need_new_page (view->print_xrd)
 849          && view->print_item < view->n_items)
 850     xr_driver_output_item (view->print_xrd, view->items [view->print_item++].item);
 851 }
 852
 853
 854 void
 855 psppire_output_view_print (struct psppire_output_view *view,
 856                            GtkWindow *parent_window)
 857 {
 858   GtkPrintOperationResult res;
 859
 860   GtkPrintOperation *print = gtk_print_operation_new ();
 861
 862   if (view->print_settings != NULL)
 863     gtk_print_operation_set_print_settings (print, view->print_settings);
 864
 865   g_signal_connect (print, "begin_print", G_CALLBACK (begin_print), view);
 866   g_signal_connect (print, "end_print",   G_CALLBACK (end_print),   view);
 867   g_signal_connect (print, "paginate",    G_CALLBACK (paginate),    view);
 868   g_signal_connect (print, "draw_page",   G_CALLBACK (draw_page),   view);
 869
 870   res = gtk_print_operation_run (print, GTK_PRINT_OPERATION_ACTION_PRINT_DIALOG,
 871                                  parent_window, NULL);
 872
 873   if (res == GTK_PRINT_OPERATION_RESULT_APPLY)
 874     {
 875       if (view->print_settings != NULL)
 876         g_object_unref (view->print_settings);
 877       view->print_settings = g_object_ref (gtk_print_operation_get_print_settings (print));
 878     }
 879
 880   g_object_unref (print);
 881 }
 882 \f
 883 struct psppire_output_view_driver
 884   {
 885     struct output_driver driver;
 886     struct psppire_output_view *view;
 887   };
 888
 889 static struct psppire_output_view_driver *
 890 psppire_output_view_driver_cast (struct output_driver *driver)
 891 {
 892   return UP_CAST (driver, struct psppire_output_view_driver, driver);
 893 }
 894
 895 static void
 896 psppire_output_view_submit (struct output_driver *this,
 897                             const struct output_item *item)
 898 {
 899   struct psppire_output_view_driver *povd = psppire_output_view_driver_cast (this);
 900
 901   if (is_table_item (item))
 902     psppire_output_view_put (povd->view, item);
 903 }
 904
 905 static struct output_driver_class psppire_output_view_driver_class =
 906   {
 907     "PSPPIRE Output View",      /* name */
 908     NULL,                       /* destroy */
 909     psppire_output_view_submit, /* submit */
 910     NULL,                       /* flush */
 911   };
 912
 913 void
 914 psppire_output_view_register_driver (struct psppire_output_view *view)
 915 {
 916   struct psppire_output_view_driver *povd;
 917   struct output_driver *d;
 918
 919   povd = xzalloc (sizeof *povd);
 920   povd->view = view;
 921   d = &povd->driver;
 922   output_driver_init (d, &psppire_output_view_driver_class, "PSPPIRE Output View",
 923                       SETTINGS_DEVICE_UNFILTERED);
 924   output_driver_register (d);
 925 }