shell/ev-view.c

   1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8; c-indent-level: 8 -*- */
   2 /* this file is part of evince, a gnome document viewer
   3  *
   4  *  Copyright (C) 2004 Red Hat, Inc
   5  *
   6  * Evince is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * Evince is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include <gtk/gtkalignment.h>
  22 #include <glib/gi18n.h>
  23 #include <gtk/gtkbindings.h>
  24 #include <gtk/gtkselection.h>
  25 #include <gtk/gtkclipboard.h>
  26 #include <gdk/gdkkeysyms.h>
  27 #include <libgnomevfs/gnome-vfs-utils.h>
  28
  29 #include "ev-marshal.h"
  30 #include "ev-view.h"
  31 #include "ev-document-find.h"
  32
  33 #define EV_VIEW_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), EV_TYPE_VIEW, EvViewClass))
  34 #define EV_IS_VIEW_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), EV_TYPE_VIEW))
  35 #define EV_VIEW_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), EV_TYPE_VIEW, EvViewClass))
  36
  37 enum {
  38         PROP_0,
  39         PROP_STATUS,
  40         PROP_FIND_STATUS
  41 };
  42
  43 enum {
  44   TARGET_STRING,
  45   TARGET_TEXT,
  46   TARGET_COMPOUND_TEXT,
  47   TARGET_UTF8_STRING,
  48   TARGET_TEXT_BUFFER_CONTENTS
  49 };
  50
  51 static const GtkTargetEntry targets[] = {
  52         { "STRING", 0, TARGET_STRING },
  53         { "TEXT",   0, TARGET_TEXT },
  54         { "COMPOUND_TEXT", 0, TARGET_COMPOUND_TEXT },
  55         { "UTF8_STRING", 0, TARGET_UTF8_STRING },
  56 };
  57
  58 typedef enum {
  59         EV_VIEW_CURSOR_NORMAL,
  60         EV_VIEW_CURSOR_LINK,
  61         EV_VIEW_CURSOR_WAIT
  62 } EvViewCursor;
  63
  64 struct _EvView {
  65         GtkWidget parent_instance;
  66
  67         EvDocument *document;
  68         EvHistory  *history;
  69
  70         GdkWindow *bin_window;
  71
  72         char *status;
  73         char *find_status;
  74
  75         int scroll_x;
  76         int scroll_y;
  77
  78         gboolean pressed_button;
  79         gboolean has_selection;
  80         GdkPoint selection_start;
  81         GdkRectangle selection;
  82         EvViewCursor cursor;
  83
  84         GtkAdjustment *hadjustment;
  85         GtkAdjustment *vadjustment;
  86
  87         GArray *find_results;
  88         int results_on_this_page;
  89         int next_page_with_result;
  90         double find_percent_complete;
  91
  92         double scale;
  93 };
  94
  95 struct _EvViewClass {
  96         GtkWidgetClass parent_class;
  97
  98         void    (*set_scroll_adjustments) (EvView         *view,
  99                                            GtkAdjustment  *hadjustment,
 100                                            GtkAdjustment  *vadjustment);
 101         void    (*scroll_view)            (EvView         *view,
 102                                            GtkScrollType   scroll,
 103                                            gboolean        horizontal);
 104
 105         /* Should this be notify::page? */
 106         void    (*page_changed)           (EvView         *view);
 107 };
 108
 109 static guint page_changed_signal = 0;
 110
 111 static void ev_view_set_scroll_adjustments (EvView         *view,
 112                                             GtkAdjustment  *hadjustment,
 113                                             GtkAdjustment  *vadjustment);
 114
 115 G_DEFINE_TYPE (EvView, ev_view, GTK_TYPE_WIDGET)
 116
 117 /*** Helper functions ***/
 118
 119 static void
 120 view_update_adjustments (EvView *view)
 121 {
 122         int old_x = view->scroll_x;
 123         int old_y = view->scroll_y;
 124
 125         if (view->hadjustment)
 126                 view->scroll_x = view->hadjustment->value;
 127         else
 128                 view->scroll_x = 0;
 129
 130         if (view->vadjustment)
 131                 view->scroll_y = view->vadjustment->value;
 132         else
 133                 view->scroll_y = 0;
 134
 135         if (GTK_WIDGET_REALIZED (view) &&
 136             (view->scroll_x != old_x || view->scroll_y != old_y)) {
 137                 gdk_window_move (view->bin_window, - view->scroll_x, - view->scroll_y);
 138                 gdk_window_process_updates (view->bin_window, TRUE);
 139         }
 140 }
 141
 142 static void
 143 view_set_adjustment_values (EvView         *view,
 144                             GtkOrientation  orientation)
 145 {
 146         GtkWidget *widget = GTK_WIDGET (view);
 147         GtkAdjustment *adjustment;
 148         gboolean value_changed = FALSE;
 149         int requisition;
 150         int allocation;
 151
 152         if (orientation == GTK_ORIENTATION_HORIZONTAL)  {
 153                 requisition = widget->requisition.width;
 154                 allocation = widget->allocation.width;
 155                 adjustment = view->hadjustment;
 156         } else {
 157                 requisition = widget->requisition.height;
 158                 allocation = widget->allocation.height;
 159                 adjustment = view->vadjustment;
 160         }
 161
 162         if (!adjustment)
 163                 return;
 164
 165         adjustment->page_size = allocation;
 166         adjustment->step_increment = allocation * 0.1;
 167         adjustment->page_increment = allocation * 0.9;
 168         adjustment->lower = 0;
 169         adjustment->upper = MAX (allocation, requisition);
 170
 171         if (adjustment->value > adjustment->upper - adjustment->page_size) {
 172                 adjustment->value = adjustment->upper - adjustment->page_size;
 173                 value_changed = TRUE;
 174         }
 175
 176         gtk_adjustment_changed (adjustment);
 177         if (value_changed)
 178                 gtk_adjustment_value_changed (adjustment);
 179 }
 180
 181 /*** Virtual function implementations ***/
 182
 183 static void
 184 ev_view_finalize (GObject *object)
 185 {
 186         EvView *view = EV_VIEW (object);
 187
 188         if (view->document)
 189                 g_object_unref (view->document);
 190
 191         if (view->history)
 192                 g_object_unref (view->history);
 193
 194         ev_view_set_scroll_adjustments (view, NULL, NULL);
 195
 196         g_array_free (view->find_results, TRUE);
 197         view->find_results = NULL;
 198
 199         G_OBJECT_CLASS (ev_view_parent_class)->finalize (object);
 200 }
 201
 202 static void
 203 ev_view_destroy (GtkObject *object)
 204 {
 205         EvView *view = EV_VIEW (object);
 206
 207         ev_view_set_scroll_adjustments (view, NULL, NULL);
 208
 209         GTK_OBJECT_CLASS (ev_view_parent_class)->destroy (object);
 210 }
 211
 212 static void
 213 ev_view_size_request (GtkWidget      *widget,
 214                       GtkRequisition *requisition)
 215 {
 216         EvView *view = EV_VIEW (widget);
 217
 218         if (GTK_WIDGET_REALIZED (widget)) {
 219                 if (view->document) {
 220                         ev_document_get_page_size (view->document,
 221                                                    &requisition->width,
 222                                                    &requisition->height);
 223                 } else {
 224                         requisition->width = 10;
 225                         requisition->height = 10;
 226                 }
 227
 228                 requisition->width += 2;
 229                 requisition->height += 2;
 230         }
 231
 232 }
 233
 234 static void
 235 ev_view_size_allocate (GtkWidget      *widget,
 236                        GtkAllocation  *allocation)
 237 {
 238         EvView *view = EV_VIEW (widget);
 239
 240         GTK_WIDGET_CLASS (ev_view_parent_class)->size_allocate (widget, allocation);
 241
 242         view_set_adjustment_values (view, GTK_ORIENTATION_HORIZONTAL);
 243         view_set_adjustment_values (view, GTK_ORIENTATION_VERTICAL);
 244
 245         if (GTK_WIDGET_REALIZED (widget)) {
 246                 gdk_window_resize (view->bin_window,
 247                                    MAX (widget->allocation.width, widget->requisition.width),
 248                                    MAX (widget->allocation.height, widget->requisition.height));
 249         }
 250 }
 251
 252 static void
 253 ev_view_realize (GtkWidget *widget)
 254 {
 255         EvView *view = EV_VIEW (widget);
 256         GdkWindowAttr attributes;
 257
 258         GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 259
 260         attributes.window_type = GDK_WINDOW_CHILD;
 261         attributes.wclass = GDK_INPUT_OUTPUT;
 262         attributes.visual = gtk_widget_get_visual (widget);
 263         attributes.colormap = gtk_widget_get_colormap (widget);
 264
 265         attributes.x = widget->allocation.x;
 266         attributes.y = widget->allocation.y;
 267         attributes.width = widget->allocation.width;
 268         attributes.height = widget->allocation.height;
 269         attributes.event_mask = 0;
 270
 271         widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
 272                                          &attributes,
 273                                          GDK_WA_X | GDK_WA_Y |
 274                                          GDK_WA_COLORMAP |
 275                                          GDK_WA_VISUAL);
 276         gdk_window_set_user_data (widget->window, widget);
 277         widget->style = gtk_style_attach (widget->style, widget->window);
 278
 279         attributes.x = 0;
 280         attributes.y = 0;
 281         attributes.width = MAX (widget->allocation.width, widget->requisition.width);
 282         attributes.height = MAX (widget->allocation.height, widget->requisition.height);
 283         attributes.event_mask = GDK_EXPOSURE_MASK |
 284                                 GDK_BUTTON_PRESS_MASK |
 285                                 GDK_BUTTON_RELEASE_MASK |
 286                                 GDK_SCROLL_MASK |
 287                                 GDK_KEY_PRESS_MASK |
 288                                 GDK_POINTER_MOTION_MASK;
 289
 290         view->bin_window = gdk_window_new (widget->window,
 291                                            &attributes,
 292                                            GDK_WA_X | GDK_WA_Y |
 293                                            GDK_WA_COLORMAP |
 294                                            GDK_WA_VISUAL);
 295         gdk_window_set_user_data (view->bin_window, widget);
 296         gdk_window_show (view->bin_window);
 297
 298         widget->style = gtk_style_attach (widget->style, view->bin_window);
 299         gdk_window_set_background (view->bin_window, &widget->style->mid[widget->state]);
 300
 301         if (view->document) {
 302                 ev_document_set_target (view->document, view->bin_window);
 303
 304                 /* We can't get page size without a target, so we have to
 305                  * queue a size request at realization. Could be fixed
 306                  * with EvDocument changes to allow setting a GdkScreen
 307                  * without setting a target.
 308                  */
 309                 gtk_widget_queue_resize (widget);
 310         }
 311 }
 312
 313 static void
 314 ev_view_unrealize (GtkWidget *widget)
 315 {
 316         EvView *view = EV_VIEW (widget);
 317
 318         if (view->document)
 319                 ev_document_set_target (view->document, NULL);
 320
 321         gdk_window_set_user_data (view->bin_window, NULL);
 322         gdk_window_destroy (view->bin_window);
 323         view->bin_window = NULL;
 324
 325         GTK_WIDGET_CLASS (ev_view_parent_class)->unrealize (widget);
 326 }
 327
 328 static guint32
 329 ev_gdk_color_to_rgb (const GdkColor *color)
 330 {
 331   guint32 result;
 332   result = (0xff0000 | (color->red & 0xff00));
 333   result <<= 8;
 334   result |= ((color->green & 0xff00) | (color->blue >> 8));
 335   return result;
 336 }
 337
 338 static void
 339 draw_rubberband (GtkWidget *widget, GdkWindow *window, const GdkRectangle *rect)
 340 {
 341         GdkGC *gc;
 342         GdkPixbuf *pixbuf;
 343         GdkColor *fill_color_gdk;
 344         guint fill_color;
 345
 346         fill_color_gdk = gdk_color_copy (&GTK_WIDGET (widget)->style->base[GTK_STATE_SELECTED]);
 347         fill_color = ev_gdk_color_to_rgb (fill_color_gdk) << 8 | 0x40;
 348
 349         pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8,
 350                                  rect->width, rect->height);
 351         gdk_pixbuf_fill (pixbuf, fill_color);
 352
 353         gdk_draw_pixbuf (window, NULL, pixbuf,
 354                          0, 0,
 355                          rect->x,rect->y,
 356                          rect->width, rect->height,
 357                          GDK_RGB_DITHER_NONE,
 358                          0, 0);
 359
 360         g_object_unref (pixbuf);
 361
 362         gc = gdk_gc_new (window);
 363         gdk_gc_set_rgb_fg_color (gc, fill_color_gdk);
 364         gdk_draw_rectangle (window, gc, FALSE,
 365                             rect->x, rect->y,
 366                             rect->width - 1,
 367                             rect->height - 1);
 368         g_object_unref (gc);
 369
 370         gdk_color_free (fill_color_gdk);
 371 }
 372
 373 static void
 374 expose_bin_window (GtkWidget      *widget,
 375                    GdkEventExpose *event)
 376 {
 377         EvView *view = EV_VIEW (widget);
 378         int i, current_page;
 379         int x_offset, y_offset;
 380         const EvFindResult *results;
 381
 382         if (view->document == NULL)
 383                 return;
 384
 385         x_offset = MAX (0, (widget->allocation.width -
 386                             widget->requisition.width) / 2);
 387         y_offset = MAX (0, (widget->allocation.height -
 388                             widget->requisition.height) / 2);
 389         gdk_draw_rectangle (view->bin_window,
 390                             widget->style->black_gc,
 391                             FALSE,
 392                             x_offset,
 393                             y_offset,
 394                             widget->requisition.width - 1,
 395                             widget->requisition.height - 1);
 396
 397         ev_document_set_page_offset (view->document,
 398                                      x_offset + 1,
 399                                      y_offset + 1);
 400
 401         ev_document_render (view->document,
 402                             event->area.x, event->area.y,
 403                             event->area.width, event->area.height);
 404
 405         results = (EvFindResult*) view->find_results->data;
 406         current_page = ev_document_get_page (view->document);
 407         i = 0;
 408         while (i < view->find_results->len) {
 409 #if 0
 410                 g_printerr ("highlighting result %d page %d at %d,%d %dx%d\n",
 411                             i, results[i].page_num,
 412                             results[i].highlight_area.x,
 413                             results[i].highlight_area.y,
 414                             results[i].highlight_area.width,
 415                             results[i].highlight_area.height);
 416 #endif
 417                 if (results[i].page_num == current_page)
 418                         draw_rubberband (widget, view->bin_window,
 419                                          &results[i].highlight_area);
 420                 ++i;
 421         }
 422
 423         if (view->has_selection) {
 424                 draw_rubberband (widget, view->bin_window, &view->selection);
 425         }
 426 }
 427
 428 static gboolean
 429 ev_view_expose_event (GtkWidget      *widget,
 430                       GdkEventExpose *event)
 431 {
 432         EvView *view = EV_VIEW (widget);
 433
 434         if (event->window == view->bin_window)
 435                 expose_bin_window (widget, event);
 436         else
 437                 return GTK_WIDGET_CLASS (ev_view_parent_class)->expose_event (widget, event);
 438
 439         return FALSE;
 440 }
 441
 442 void
 443 ev_view_select_all (EvView *ev_view)
 444 {
 445         GtkWidget *widget = GTK_WIDGET (ev_view);
 446
 447         g_return_if_fail (EV_IS_VIEW (ev_view));
 448
 449         ev_view->has_selection = TRUE;
 450         ev_view->selection.x = ev_view->selection.y = 0;
 451         ev_view->selection.width = widget->requisition.width;
 452         ev_view->selection.height = widget->requisition.height;
 453
 454         gtk_widget_queue_draw (widget);
 455 }
 456
 457 void
 458 ev_view_copy (EvView *ev_view)
 459 {
 460         GtkClipboard *clipboard;
 461         char *text;
 462
 463         text = ev_document_get_text (ev_view->document, &ev_view->selection);
 464         clipboard = gtk_widget_get_clipboard (GTK_WIDGET (ev_view),
 465                                               GDK_SELECTION_CLIPBOARD);
 466         gtk_clipboard_set_text (clipboard, text, -1);
 467         g_free (text);
 468 }
 469
 470 static void
 471 ev_view_primary_get_cb (GtkClipboard     *clipboard,
 472                         GtkSelectionData *selection_data,
 473                         guint             info,
 474                         gpointer          data)
 475 {
 476         EvView *ev_view = EV_VIEW (data);
 477         char *text;
 478
 479         text = ev_document_get_text (ev_view->document, &ev_view->selection);
 480         gtk_selection_data_set_text (selection_data, text, -1);
 481 }
 482
 483 static void
 484 ev_view_primary_clear_cb (GtkClipboard *clipboard,
 485                           gpointer      data)
 486 {
 487         EvView *ev_view = EV_VIEW (data);
 488
 489         ev_view->has_selection = FALSE;
 490 }
 491
 492 static void
 493 ev_view_update_primary_selection (EvView *ev_view)
 494 {
 495         GtkClipboard *clipboard;
 496
 497         clipboard = gtk_widget_get_clipboard (GTK_WIDGET (ev_view),
 498                                               GDK_SELECTION_PRIMARY);
 499
 500         if (ev_view->has_selection) {
 501                 if (!gtk_clipboard_set_with_owner (clipboard,
 502                                                    targets,
 503                                                    G_N_ELEMENTS (targets),
 504                                                    ev_view_primary_get_cb,
 505                                                    ev_view_primary_clear_cb,
 506                                                    G_OBJECT (ev_view)))
 507                         ev_view_primary_clear_cb (clipboard, ev_view);
 508         } else {
 509                 if (gtk_clipboard_get_owner (clipboard) == G_OBJECT (ev_view))
 510                         gtk_clipboard_clear (clipboard);
 511         }
 512 }
 513
 514 static gboolean
 515 ev_view_button_press_event (GtkWidget      *widget,
 516                             GdkEventButton *event)
 517 {
 518         EvView *view = EV_VIEW (widget);
 519
 520         if (!GTK_WIDGET_HAS_FOCUS (widget)) {
 521                 gtk_widget_grab_focus (widget);
 522         }
 523
 524         view->pressed_button = event->button;
 525
 526         switch (event->button) {
 527                 case 1:
 528                         if (view->has_selection) {
 529                                 view->has_selection = FALSE;
 530                                 gtk_widget_queue_draw (widget);
 531                         }
 532
 533                         view->selection_start.x = event->x;
 534                         view->selection_start.y = event->y;
 535                         break;
 536         }
 537
 538         return TRUE;
 539 }
 540
 541 static char *
 542 status_message_from_link (EvLink *link)
 543 {
 544         EvLinkType type;
 545         char *msg;
 546         int page;
 547
 548         type = ev_link_get_link_type (link);
 549
 550         switch (type) {
 551                 case EV_LINK_TYPE_TITLE:
 552                         msg = g_strdup (ev_link_get_title (link));
 553                         break;
 554                 case EV_LINK_TYPE_PAGE:
 555                         page = ev_link_get_page (link);
 556                         msg = g_strdup_printf (_("Go to page %d"), page);
 557                         break;
 558                 case EV_LINK_TYPE_EXTERNAL_URI:
 559                         msg = g_strdup (ev_link_get_uri (link));
 560                         break;
 561                 default:
 562                         msg = NULL;
 563         }
 564
 565         return msg;
 566 }
 567
 568 static void
 569 ev_view_set_status (EvView *view, const char *message)
 570 {
 571         g_return_if_fail (EV_IS_VIEW (view));
 572
 573         if (message != view->status) {
 574                 g_free (view->status);
 575                 view->status = g_strdup (message);
 576                 g_object_notify (G_OBJECT (view), "status");
 577         }
 578 }
 579
 580 static void
 581 ev_view_set_find_status (EvView *view, const char *message)
 582 {
 583         g_return_if_fail (EV_IS_VIEW (view));
 584
 585         g_free (view->find_status);
 586         view->find_status = g_strdup (message);
 587         g_object_notify (G_OBJECT (view), "find-status");
 588 }
 589
 590 static void
 591 ev_view_set_cursor (EvView *view, EvViewCursor new_cursor)
 592 {
 593         GdkCursor *cursor = NULL;
 594         GdkDisplay *display;
 595         GtkWidget *widget;
 596
 597         if (view->cursor == new_cursor) {
 598                 return;
 599         }
 600
 601         widget = gtk_widget_get_toplevel (GTK_WIDGET (view));
 602         display = gtk_widget_get_display (widget);
 603         view->cursor = new_cursor;
 604
 605         switch (new_cursor) {
 606                 case EV_VIEW_CURSOR_NORMAL:
 607                         gdk_window_set_cursor (widget->window, NULL);
 608                         break;
 609                 case EV_VIEW_CURSOR_LINK:
 610                         cursor = gdk_cursor_new_for_display (display, GDK_HAND2);
 611                         break;
 612                 case EV_VIEW_CURSOR_WAIT:
 613                         cursor = gdk_cursor_new_for_display (display, GDK_WATCH);
 614                         break;
 615         }
 616
 617         if (cursor) {
 618                 gdk_window_set_cursor (widget->window, cursor);
 619                 gdk_cursor_unref (cursor);
 620                 gdk_flush();
 621         }
 622 }
 623
 624 static gboolean
 625 ev_view_motion_notify_event (GtkWidget      *widget,
 626                              GdkEventMotion *event)
 627 {
 628         EvView *view = EV_VIEW (widget);
 629
 630         if (view->pressed_button > 0) {
 631                 view->has_selection = TRUE;
 632                 view->selection.x = MIN (view->selection_start.x, event->x);
 633                 view->selection.y = MIN (view->selection_start.y, event->y);
 634                 view->selection.width = ABS (view->selection_start.x - event->x) + 1;
 635                 view->selection.height = ABS (view->selection_start.y - event->y) + 1;
 636         } else if (view->document) {
 637                 EvLink *link;
 638
 639                 link = ev_document_get_link (view->document, event->x, event->y);
 640                 if (link) {
 641                         char *msg;
 642
 643                         msg = status_message_from_link (link);
 644                         ev_view_set_status (view, msg);
 645                         ev_view_set_cursor (view, EV_VIEW_CURSOR_LINK);
 646                         g_free (msg);
 647
 648                         g_object_unref (link);
 649                 } else {
 650                         ev_view_set_status (view, NULL);
 651                         if (view->cursor == EV_VIEW_CURSOR_LINK) {
 652                                 ev_view_set_cursor (view, EV_VIEW_CURSOR_NORMAL);
 653                         }
 654                 }
 655         }
 656
 657         gtk_widget_queue_draw (widget);
 658
 659         return TRUE;
 660 }
 661
 662 static gboolean
 663 ev_view_button_release_event (GtkWidget      *widget,
 664                               GdkEventButton *event)
 665 {
 666         EvView *view = EV_VIEW (widget);
 667
 668         view->pressed_button = -1;
 669
 670         if (view->has_selection) {
 671                 ev_view_update_primary_selection (view);
 672         } else if (view->document) {
 673                 EvLink *link;
 674
 675                 link = ev_document_get_link (view->document,
 676                                              event->x,
 677                                              event->y);
 678                 if (link) {
 679                         ev_view_go_to_link (view, link);
 680                         g_object_unref (link);
 681                 }
 682         }
 683
 684         return FALSE;
 685 }
 686
 687 static void
 688 on_adjustment_value_changed (GtkAdjustment  *adjustment,
 689                              EvView *view)
 690 {
 691         view_update_adjustments (view);
 692 }
 693
 694 static void
 695 set_scroll_adjustment (EvView *view,
 696                        GtkOrientation  orientation,
 697                        GtkAdjustment  *adjustment)
 698 {
 699         GtkAdjustment **to_set;
 700
 701         if (orientation == GTK_ORIENTATION_HORIZONTAL)
 702                 to_set = &view->hadjustment;
 703         else
 704                 to_set = &view->vadjustment;
 705
 706         if (*to_set != adjustment) {
 707                 if (*to_set) {
 708                         g_signal_handlers_disconnect_by_func (*to_set,
 709                                                               (gpointer) on_adjustment_value_changed,
 710                                                               view);
 711                         g_object_unref (*to_set);
 712                 }
 713
 714                 *to_set = adjustment;
 715                 view_set_adjustment_values (view, orientation);
 716
 717                 if (*to_set) {
 718                         g_object_ref (*to_set);
 719                         g_signal_connect (*to_set, "value_changed",
 720                                           G_CALLBACK (on_adjustment_value_changed), view);
 721                 }
 722         }
 723 }
 724
 725 static void
 726 ev_view_set_scroll_adjustments (EvView *view,
 727                                 GtkAdjustment  *hadjustment,
 728                                 GtkAdjustment  *vadjustment)
 729 {
 730         set_scroll_adjustment (view, GTK_ORIENTATION_HORIZONTAL, hadjustment);
 731         set_scroll_adjustment (view, GTK_ORIENTATION_VERTICAL, vadjustment);
 732
 733         view_update_adjustments (view);
 734 }
 735
 736 static void
 737 add_scroll_binding (GtkBindingSet  *binding_set,
 738                     guint           keyval,
 739                     GtkScrollType   scroll,
 740                     gboolean        horizontal)
 741 {
 742   guint keypad_keyval = keyval - GDK_Left + GDK_KP_Left;
 743
 744   gtk_binding_entry_add_signal (binding_set, keyval, 0,
 745                                 "scroll_view", 2,
 746                                 GTK_TYPE_SCROLL_TYPE, scroll,
 747                                 G_TYPE_BOOLEAN, horizontal);
 748   gtk_binding_entry_add_signal (binding_set, keypad_keyval, 0,
 749                                 "scroll_view", 2,
 750                                 GTK_TYPE_SCROLL_TYPE, scroll,
 751                                 G_TYPE_BOOLEAN, horizontal);
 752 }
 753
 754 static void
 755 ev_view_scroll_view (EvView *view,
 756                      GtkScrollType scroll,
 757                      gboolean horizontal)
 758 {
 759         if (scroll == GTK_SCROLL_PAGE_BACKWARD) {
 760                 ev_view_set_page (view, ev_view_get_page (view) - 1);
 761         } else if (scroll == GTK_SCROLL_PAGE_FORWARD) {
 762                 ev_view_set_page (view, ev_view_get_page (view) + 1);
 763         } else {
 764                 GtkAdjustment *adjustment;
 765                 double value;
 766
 767                 if (horizontal) {
 768                         adjustment = view->hadjustment;
 769                 } else {
 770                         adjustment = view->vadjustment;
 771                 }
 772
 773                 value = adjustment->value;
 774
 775                 switch (scroll) {
 776                         case GTK_SCROLL_STEP_BACKWARD:
 777                                 value -= adjustment->step_increment;
 778                                 break;
 779                         case GTK_SCROLL_STEP_FORWARD:
 780                                 value += adjustment->step_increment;
 781                                 break;
 782                         default:
 783                                 break;
 784                 }
 785
 786                 value = CLAMP (value, adjustment->lower,
 787                                adjustment->upper - adjustment->page_size);
 788
 789                 gtk_adjustment_set_value (adjustment, value);
 790         }
 791 }
 792
 793 static void
 794 ev_view_set_property (GObject *object,
 795                       guint prop_id,
 796                       const GValue *value,
 797                       GParamSpec *pspec)
 798 {
 799         switch (prop_id)
 800         {
 801                 /* Read only */
 802                 case PROP_STATUS:
 803                 case PROP_FIND_STATUS:
 804                         break;
 805         }
 806 }
 807
 808 static void
 809 ev_view_get_property (GObject *object,
 810                       guint prop_id,
 811                       GValue *value,
 812                       GParamSpec *pspec)
 813 {
 814         EvView *view = EV_VIEW (object);
 815
 816         switch (prop_id)
 817         {
 818                 case PROP_STATUS:
 819                         g_value_set_string (value, view->status);
 820                         break;
 821                 case PROP_FIND_STATUS:
 822                         g_value_set_string (value, view->status);
 823                         break;
 824         }
 825 }
 826
 827 static void
 828 ev_view_class_init (EvViewClass *class)
 829 {
 830         GObjectClass *object_class = G_OBJECT_CLASS (class);
 831         GtkObjectClass *gtk_object_class = GTK_OBJECT_CLASS (class);
 832         GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
 833         GtkBindingSet *binding_set;
 834
 835         object_class->finalize = ev_view_finalize;
 836         object_class->set_property = ev_view_set_property;
 837         object_class->get_property = ev_view_get_property;
 838
 839         widget_class->expose_event = ev_view_expose_event;
 840         widget_class->button_press_event = ev_view_button_press_event;
 841         widget_class->motion_notify_event = ev_view_motion_notify_event;
 842         widget_class->button_release_event = ev_view_button_release_event;
 843         widget_class->size_request = ev_view_size_request;
 844         widget_class->size_allocate = ev_view_size_allocate;
 845         widget_class->realize = ev_view_realize;
 846         widget_class->unrealize = ev_view_unrealize;
 847         gtk_object_class->destroy = ev_view_destroy;
 848
 849         class->set_scroll_adjustments = ev_view_set_scroll_adjustments;
 850         class->scroll_view = ev_view_scroll_view;
 851
 852         widget_class->set_scroll_adjustments_signal =  g_signal_new ("set-scroll-adjustments",
 853                                                                      G_OBJECT_CLASS_TYPE (object_class),
 854                                                                      G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 855                                                                      G_STRUCT_OFFSET (EvViewClass, set_scroll_adjustments),
 856                                                                      NULL, NULL,
 857                                                                      ev_marshal_VOID__OBJECT_OBJECT,
 858                                                                      G_TYPE_NONE, 2,
 859                                                                      GTK_TYPE_ADJUSTMENT,
 860                                                                      GTK_TYPE_ADJUSTMENT);
 861         page_changed_signal = g_signal_new ("page-changed",
 862                                             G_OBJECT_CLASS_TYPE (object_class),
 863                                             G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 864                                             G_STRUCT_OFFSET (EvViewClass, page_changed),
 865                                             NULL, NULL,
 866                                             ev_marshal_VOID__NONE,
 867                                             G_TYPE_NONE, 0);
 868
 869         g_signal_new ("scroll_view",
 870                       G_TYPE_FROM_CLASS (object_class),
 871                       G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 872                       G_STRUCT_OFFSET (EvViewClass, scroll_view),
 873                       NULL, NULL,
 874                       ev_marshal_VOID__ENUM_BOOLEAN,
 875                       G_TYPE_NONE, 2,
 876                       GTK_TYPE_SCROLL_TYPE,
 877                       G_TYPE_BOOLEAN);
 878
 879         g_object_class_install_property (object_class,
 880                                          PROP_STATUS,
 881                                          g_param_spec_string ("status",
 882                                                               "Status Message",
 883                                                               "The status message",
 884                                                               NULL,
 885                                                               G_PARAM_READABLE));
 886
 887         g_object_class_install_property (object_class,
 888                                          PROP_STATUS,
 889                                          g_param_spec_string ("find-status",
 890                                                               "Find Status Message",
 891                                                               "The find status message",
 892                                                               NULL,
 893                                                               G_PARAM_READABLE));
 894
 895         binding_set = gtk_binding_set_by_class (class);
 896
 897         add_scroll_binding (binding_set, GDK_Left,  GTK_SCROLL_STEP_BACKWARD, TRUE);
 898         add_scroll_binding (binding_set, GDK_Right, GTK_SCROLL_STEP_FORWARD,  TRUE);
 899         add_scroll_binding (binding_set, GDK_Up,    GTK_SCROLL_STEP_BACKWARD, FALSE);
 900         add_scroll_binding (binding_set, GDK_Down,  GTK_SCROLL_STEP_FORWARD,  FALSE);
 901
 902         add_scroll_binding (binding_set, GDK_Page_Up,   GTK_SCROLL_PAGE_BACKWARD, FALSE);
 903         add_scroll_binding (binding_set, GDK_Page_Down, GTK_SCROLL_PAGE_FORWARD,  FALSE);
 904 }
 905
 906 static void
 907 ev_view_init (EvView *view)
 908 {
 909         GTK_WIDGET_SET_FLAGS (view, GTK_CAN_FOCUS);
 910
 911         view->scale = 1.0;
 912         view->pressed_button = -1;
 913         view->cursor = EV_VIEW_CURSOR_NORMAL;
 914
 915         view->find_results = g_array_new (FALSE,
 916                                           FALSE,
 917                                           sizeof (EvFindResult));
 918         view->results_on_this_page = 0;
 919         view->next_page_with_result = 0;
 920 }
 921
 922 static char *
 923 ev_view_get_find_status_message (EvView *view)
 924 {
 925         if (view->find_results->len == 0) {
 926                 if (view->find_percent_complete >= (1.0 - 1e-10)) {
 927                         return g_strdup (_("Not found"));
 928                 } else {
 929                         return g_strdup_printf (_("%3d%% remaining to search"),
 930                                                 (int) ((1.0 - view->find_percent_complete) * 100));
 931                 }
 932         } else if (view->results_on_this_page == 0) {
 933                 g_assert (view->next_page_with_result != 0);
 934                 return g_strdup_printf (_("Found on page %d"),
 935                                         view->next_page_with_result);
 936         } else {
 937                 return g_strdup_printf (_("%d found on this page"),
 938                                         view->results_on_this_page);
 939         }
 940 }
 941
 942 static void
 943 update_find_results (EvView *view)
 944 {
 945         const EvFindResult *results;
 946         int i;
 947         int on_this_page;
 948         int next_page_with_result;
 949         int earliest_page_with_result;
 950         int current_page;
 951         gboolean counts_changed;
 952
 953         results = (EvFindResult*) view->find_results->data;
 954         current_page = ev_document_get_page (view->document);
 955         next_page_with_result = 0;
 956         on_this_page = 0;
 957         earliest_page_with_result = 0;
 958
 959         i = 0;
 960         while (i < view->find_results->len) {
 961                 if (results[i].page_num == current_page) {
 962                         ++on_this_page;
 963                 } else {
 964                         int delta = results[i].page_num - current_page;
 965
 966                         if (delta > 0 && /* result on later page */
 967                             (next_page_with_result == 0 ||
 968                              results[i].page_num < next_page_with_result))
 969                                 next_page_with_result = results[i].page_num;
 970
 971                         if (delta < 0 && /* result on a previous page */
 972                             (earliest_page_with_result == 0 ||
 973                              results[i].page_num < earliest_page_with_result))
 974                                 earliest_page_with_result = results[i].page_num;
 975                 }
 976                 ++i;
 977         }
 978
 979         /* If earliest page is just the current page, there is no earliest page */
 980         if (earliest_page_with_result == current_page)
 981                 earliest_page_with_result = 0;
 982
 983         /* If no next page, then wrap and the wrapped page is the next page */
 984         if (next_page_with_result == 0)
 985                 next_page_with_result = earliest_page_with_result;
 986
 987         counts_changed = FALSE;
 988         if (on_this_page != view->results_on_this_page ||
 989             next_page_with_result != view->next_page_with_result) {
 990                 view->results_on_this_page = on_this_page;
 991                 view->next_page_with_result = next_page_with_result;
 992                 counts_changed = TRUE;
 993         }
 994
 995         if (counts_changed ||
 996             view->find_results->len == 0) {
 997                 char *message;
 998
 999                 message = ev_view_get_find_status_message (view);
1000                 ev_view_set_find_status (view, message);
1001                 g_free (message);
1002         }
1003 }
1004
1005 static void
1006 found_results_callback (EvDocument         *document,
1007                         const EvFindResult *results,
1008                         int                 n_results,
1009                         double              percent_complete,
1010                         void               *data)
1011 {
1012   EvView *view = EV_VIEW (data);
1013
1014   g_array_set_size (view->find_results, 0);
1015
1016   if (n_results > 0)
1017           g_array_append_vals (view->find_results,
1018                                results, n_results);
1019
1020 #if 0
1021   {
1022           int i;
1023
1024           g_printerr ("%d results %d%%: ", n_results,
1025                       (int) (percent_complete * 100));
1026           i = 0;
1027           while (i < n_results) {
1028                   g_printerr ("%d ", results[i].page_num);
1029                   ++i;
1030           }
1031           g_printerr ("\n");
1032   }
1033 #endif
1034
1035   view->find_percent_complete = percent_complete;
1036   update_find_results (view);
1037
1038   gtk_widget_queue_draw (GTK_WIDGET (view));
1039 }
1040
1041 static void
1042 document_changed_callback (EvDocument *document,
1043                            EvView     *view)
1044 {
1045         gtk_widget_queue_draw (GTK_WIDGET (view));
1046         ev_view_set_cursor (view, EV_VIEW_CURSOR_NORMAL);
1047 }
1048
1049 /*** Public API ***/
1050
1051 GtkWidget*
1052 ev_view_new (void)
1053 {
1054         return g_object_new (EV_TYPE_VIEW, NULL);
1055 }
1056
1057 void
1058 ev_view_set_document (EvView     *view,
1059                       EvDocument *document)
1060 {
1061         g_return_if_fail (EV_IS_VIEW (view));
1062
1063         if (document != view->document) {
1064                 if (view->document) {
1065                         g_signal_handlers_disconnect_by_func (view->document,
1066                                                               found_results_callback,
1067                                                               view);
1068                         g_array_set_size (view->find_results, 0);
1069                         view->results_on_this_page = 0;
1070                         view->next_page_with_result = 0;
1071
1072                         g_object_unref (view->document);
1073                 }
1074
1075                 view->document = document;
1076
1077                 if (view->document) {
1078                         g_object_ref (view->document);
1079                         if (EV_IS_DOCUMENT_FIND (view->document))
1080                                 g_signal_connect (view->document,
1081                                                   "found",
1082                                                   G_CALLBACK (found_results_callback),
1083                                                   view);
1084                         g_signal_connect (view->document,
1085                                           "changed",
1086                                           G_CALLBACK (document_changed_callback),
1087                                           view);
1088                 }
1089
1090                 if (GTK_WIDGET_REALIZED (view))
1091                         ev_document_set_target (view->document, view->bin_window);
1092
1093                 gtk_widget_queue_resize (GTK_WIDGET (view));
1094
1095                 g_signal_emit (view, page_changed_signal, 0);
1096         }
1097 }
1098
1099 static void
1100 set_document_page (EvView *view, int page)
1101 {
1102         if (view->document) {
1103                 int old_page = ev_document_get_page (view->document);
1104                 int old_width, old_height;
1105
1106                 ev_document_get_page_size (view->document,
1107                                            &old_width, &old_height);
1108
1109                 if (old_page != page) {
1110                         ev_view_set_cursor (view, EV_VIEW_CURSOR_WAIT);
1111                         ev_document_set_page (view->document, page);
1112                 }
1113
1114                 if (old_page != ev_document_get_page (view->document)) {
1115                         int width, height;
1116
1117                         g_signal_emit (view, page_changed_signal, 0);
1118
1119                         view->has_selection = FALSE;
1120                         ev_document_get_page_size (view->document,
1121                                                    &width, &height);
1122                         if (width != old_width || height != old_height)
1123                                 gtk_widget_queue_resize (GTK_WIDGET (view));
1124
1125                         view->find_percent_complete = 0.0;
1126                         update_find_results (view);
1127                 }
1128         }
1129 }
1130
1131 static void
1132 go_to_link (EvView *view, EvLink *link)
1133 {
1134         EvLinkType type;
1135         const char *uri;
1136         int page;
1137
1138         type = ev_link_get_link_type (link);
1139
1140         switch (type) {
1141                 case EV_LINK_TYPE_TITLE:
1142                         break;
1143                 case EV_LINK_TYPE_PAGE:
1144                         page = ev_link_get_page (link);
1145                         set_document_page (view, page);
1146                         break;
1147                 case EV_LINK_TYPE_EXTERNAL_URI:
1148                         uri = ev_link_get_uri (link);
1149                         gnome_vfs_url_show (uri);
1150                         break;
1151         }
1152 }
1153
1154 void
1155 ev_view_go_to_link (EvView *view, EvLink *link)
1156 {
1157         EvLinkType type;
1158
1159         go_to_link (view, link);
1160
1161         type = ev_link_get_link_type (link);
1162         if (type == EV_LINK_TYPE_PAGE) {
1163                 ev_history_add_link (view->history, link);
1164         }
1165 }
1166
1167 static void
1168 go_to_index (EvView *view, int index)
1169 {
1170         EvLink *link;
1171
1172         link = ev_history_get_link_nth (view->history, index);
1173         g_return_if_fail (link != NULL);
1174
1175         go_to_link (view, link);
1176 }
1177
1178 gboolean
1179 ev_view_can_go_back (EvView *view)
1180 {
1181         int index, n;
1182
1183         if (view->history == NULL) {
1184                 return FALSE;
1185         }
1186
1187         index = ev_history_get_current_index (view->history);
1188         n = ev_history_get_n_links (view->history);
1189
1190         if (n > 0) {
1191                 return index != MAX (0, index - 1);
1192         } else {
1193                 return FALSE;
1194         }
1195 }
1196
1197 void
1198 ev_view_go_back (EvView *view)
1199 {
1200         int index, n;
1201
1202         g_return_if_fail (EV_IS_HISTORY (view->history));
1203
1204         index = ev_history_get_current_index (view->history);
1205         n = ev_history_get_n_links (view->history);
1206
1207         if (n > 0) {
1208                 index = MAX (0, index - 1);
1209                 ev_history_set_current_index (view->history, index);
1210         }
1211 }
1212
1213 gboolean
1214 ev_view_can_go_forward (EvView *view)
1215 {
1216         int index, n;
1217
1218         if (view->history == NULL) {
1219                 return FALSE;
1220         }
1221
1222         index = ev_history_get_current_index (view->history);
1223         n = ev_history_get_n_links (view->history);
1224
1225         if (n > 0) {
1226                 return  index != MIN (n - 1, index + 1);
1227         } else {
1228                 return FALSE;
1229         }
1230 }
1231
1232 void
1233 ev_view_go_forward (EvView *view)
1234 {
1235         int index, n;
1236
1237         g_return_if_fail (EV_IS_HISTORY (view->history));
1238
1239         index = ev_history_get_current_index (view->history);
1240         n = ev_history_get_n_links (view->history);
1241
1242         if (n > 0) {
1243                 index = MIN (n - 1, index + 1);
1244                 ev_history_set_current_index (view->history, index);
1245         }
1246 }
1247
1248
1249 void
1250 ev_view_set_page (EvView *view,
1251                   int     page)
1252 {
1253         g_return_if_fail (EV_IS_VIEW (view));
1254         g_return_if_fail (EV_IS_HISTORY (view->history));
1255
1256         set_document_page (view, page);
1257         ev_history_add_page (view->history, page);
1258 }
1259
1260 int
1261 ev_view_get_page (EvView *view)
1262 {
1263         if (view->document)
1264                 return ev_document_get_page (view->document);
1265         else
1266                 return 1;
1267 }
1268
1269 #define ZOOM_IN_FACTOR  1.2
1270 #define ZOOM_OUT_FACTOR (1.0/ZOOM_IN_FACTOR)
1271
1272 #define MIN_SCALE 0.05409
1273 #define MAX_SCALE 18.4884
1274
1275 static void
1276 ev_view_zoom (EvView   *view,
1277               double    factor,
1278               gboolean  relative)
1279 {
1280         double scale;
1281
1282         if (relative)
1283                 scale = view->scale * factor;
1284         else
1285                 scale = factor;
1286
1287         view->scale = CLAMP (scale, MIN_SCALE, MAX_SCALE);
1288
1289         ev_document_set_scale (view->document, view->scale);
1290
1291         gtk_widget_queue_resize (GTK_WIDGET (view));
1292 }
1293
1294 void
1295 ev_view_zoom_in (EvView *view)
1296 {
1297         ev_view_zoom (view, ZOOM_IN_FACTOR, TRUE);
1298 }
1299
1300 void
1301 ev_view_zoom_out (EvView *view)
1302 {
1303         ev_view_zoom (view, ZOOM_OUT_FACTOR, TRUE);
1304 }
1305
1306 void
1307 ev_view_normal_size (EvView *view)
1308 {
1309         ev_view_zoom (view, 1.0, FALSE);
1310 }
1311
1312 void
1313 ev_view_best_fit (EvView *view)
1314 {
1315         double scale;
1316         int width, height;
1317
1318         width = height = 0;
1319         ev_document_get_page_size (view->document, &width, &height);
1320
1321         scale = 1.0;
1322         if (width != 0 && height != 0) {
1323                 double scale_w, scale_h;
1324
1325                 scale_w = (double)GTK_WIDGET (view)->allocation.width * view->scale / width;
1326                 scale_h = (double)GTK_WIDGET (view)->allocation.height * view->scale / height;
1327
1328                 scale = (scale_w < scale_h) ? scale_w : scale_h;
1329         }
1330
1331         ev_view_zoom (view, scale, FALSE);
1332 }
1333
1334 void
1335 ev_view_fit_width (EvView *view)
1336 {
1337         double scale = 1.0;
1338         int width;
1339
1340         width = 0;
1341         ev_document_get_page_size (view->document, &width, NULL);
1342
1343         scale = 1.0;
1344         if (width != 0)
1345                 scale = (double)GTK_WIDGET (view)->allocation.width * view->scale / width;
1346
1347         ev_view_zoom (view, scale, FALSE);
1348 }
1349
1350 static void
1351 history_index_changed_cb (EvHistory  *history,
1352                           GParamSpec *pspec,
1353                           EvView     *view)
1354 {
1355         int index;
1356
1357         index = ev_history_get_current_index (history);
1358         go_to_index (view, index);
1359 }
1360
1361 void
1362 ev_view_set_history (EvView     *view,
1363                      EvHistory  *history)
1364 {
1365         if (view->history) {
1366                 g_object_unref (view->history);
1367         }
1368
1369         view->history = g_object_ref (history);
1370         ev_history_add_page (view->history, ev_view_get_page (view));
1371
1372         g_signal_connect (view->history, "notify::index",
1373                           G_CALLBACK (history_index_changed_cb),
1374                           view);
1375 }
1376
1377 const char *
1378 ev_view_get_status (EvView *view)
1379 {
1380         g_return_val_if_fail (EV_IS_VIEW (view), NULL);
1381
1382         return view->status;
1383 }
1384
1385 const char *
1386 ev_view_get_find_status (EvView *view)
1387 {
1388         g_return_val_if_fail (EV_IS_VIEW (view), NULL);
1389
1390         return view->find_status;
1391 }
1392
1393