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