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
  69         GdkWindow *bin_window;
  70
  71         char *status;
  72         char *find_status;
  73
  74         int scroll_x;
  75         int scroll_y;
  76
  77         gboolean pressed_button;
  78         gboolean has_selection;
  79         GdkPoint selection_start;
  80         GdkRectangle selection;
  81         EvViewCursor cursor;
  82
  83         GtkAdjustment *hadjustment;
  84         GtkAdjustment *vadjustment;
  85
  86         int find_page;
  87         int find_result;
  88
  89         double scale;
  90 };
  91
  92 struct _EvViewClass {
  93         GtkWidgetClass parent_class;
  94
  95         void    (*set_scroll_adjustments) (EvView         *view,
  96                                            GtkAdjustment  *hadjustment,
  97                                            GtkAdjustment  *vadjustment);
  98         void    (*scroll_view)            (EvView         *view,
  99                                            GtkScrollType   scroll,
 100                                            gboolean        horizontal);
 101
 102         /* Should this be notify::page? */
 103         void    (*page_changed)           (EvView         *view);
 104 };
 105
 106 static guint page_changed_signal = 0;
 107
 108 static void ev_view_set_scroll_adjustments (EvView         *view,
 109                                             GtkAdjustment  *hadjustment,
 110                                             GtkAdjustment  *vadjustment);
 111
 112 G_DEFINE_TYPE (EvView, ev_view, GTK_TYPE_WIDGET)
 113
 114 /*** Helper functions ***/
 115
 116 static void
 117 view_update_adjustments (EvView *view)
 118 {
 119         int old_x = view->scroll_x;
 120         int old_y = view->scroll_y;
 121
 122         if (view->hadjustment)
 123                 view->scroll_x = view->hadjustment->value;
 124         else
 125                 view->scroll_x = 0;
 126
 127         if (view->vadjustment)
 128                 view->scroll_y = view->vadjustment->value;
 129         else
 130                 view->scroll_y = 0;
 131
 132         if (GTK_WIDGET_REALIZED (view) &&
 133             (view->scroll_x != old_x || view->scroll_y != old_y)) {
 134                 gdk_window_move (view->bin_window, - view->scroll_x, - view->scroll_y);
 135                 gdk_window_process_updates (view->bin_window, TRUE);
 136         }
 137 }
 138
 139 static void
 140 view_set_adjustment_values (EvView         *view,
 141                             GtkOrientation  orientation)
 142 {
 143         GtkWidget *widget = GTK_WIDGET (view);
 144         GtkAdjustment *adjustment;
 145         gboolean value_changed = FALSE;
 146         int requisition;
 147         int allocation;
 148
 149         if (orientation == GTK_ORIENTATION_HORIZONTAL)  {
 150                 requisition = widget->requisition.width;
 151                 allocation = widget->allocation.width;
 152                 adjustment = view->hadjustment;
 153         } else {
 154                 requisition = widget->requisition.height;
 155                 allocation = widget->allocation.height;
 156                 adjustment = view->vadjustment;
 157         }
 158
 159         if (!adjustment)
 160                 return;
 161
 162         adjustment->page_size = allocation;
 163         adjustment->step_increment = allocation * 0.1;
 164         adjustment->page_increment = allocation * 0.9;
 165         adjustment->lower = 0;
 166         adjustment->upper = MAX (allocation, requisition);
 167
 168         if (adjustment->value > adjustment->upper - adjustment->page_size) {
 169                 adjustment->value = adjustment->upper - adjustment->page_size;
 170                 value_changed = TRUE;
 171         }
 172
 173         gtk_adjustment_changed (adjustment);
 174         if (value_changed)
 175                 gtk_adjustment_value_changed (adjustment);
 176 }
 177
 178 /*** Virtual function implementations ***/
 179
 180 static void
 181 ev_view_finalize (GObject *object)
 182 {
 183         EvView *view = EV_VIEW (object);
 184
 185         if (view->document)
 186                 g_object_unref (view->document);
 187
 188         ev_view_set_scroll_adjustments (view, NULL, NULL);
 189
 190         G_OBJECT_CLASS (ev_view_parent_class)->finalize (object);
 191 }
 192
 193 static void
 194 ev_view_destroy (GtkObject *object)
 195 {
 196         EvView *view = EV_VIEW (object);
 197
 198         ev_view_set_scroll_adjustments (view, NULL, NULL);
 199
 200         GTK_OBJECT_CLASS (ev_view_parent_class)->destroy (object);
 201 }
 202
 203 static void
 204 ev_view_size_request (GtkWidget      *widget,
 205                       GtkRequisition *requisition)
 206 {
 207         EvView *view = EV_VIEW (widget);
 208
 209         if (GTK_WIDGET_REALIZED (widget)) {
 210                 if (view->document) {
 211                         ev_document_get_page_size (view->document,
 212                                                    -1,
 213                                                    &requisition->width,
 214                                                    &requisition->height);
 215                 } else {
 216                         requisition->width = 10;
 217                         requisition->height = 10;
 218                 }
 219
 220                 requisition->width += 2;
 221                 requisition->height += 2;
 222         }
 223
 224 }
 225
 226 static void
 227 ev_view_size_allocate (GtkWidget      *widget,
 228                        GtkAllocation  *allocation)
 229 {
 230         EvView *view = EV_VIEW (widget);
 231
 232         GTK_WIDGET_CLASS (ev_view_parent_class)->size_allocate (widget, allocation);
 233
 234         view_set_adjustment_values (view, GTK_ORIENTATION_HORIZONTAL);
 235         view_set_adjustment_values (view, GTK_ORIENTATION_VERTICAL);
 236
 237         if (GTK_WIDGET_REALIZED (widget)) {
 238                 gdk_window_resize (view->bin_window,
 239                                    MAX (widget->allocation.width, widget->requisition.width),
 240                                    MAX (widget->allocation.height, widget->requisition.height));
 241         }
 242 }
 243
 244 static void
 245 ev_view_realize (GtkWidget *widget)
 246 {
 247         EvView *view = EV_VIEW (widget);
 248         GdkWindowAttr attributes;
 249
 250         GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 251
 252         attributes.window_type = GDK_WINDOW_CHILD;
 253         attributes.wclass = GDK_INPUT_OUTPUT;
 254         attributes.visual = gtk_widget_get_visual (widget);
 255         attributes.colormap = gtk_widget_get_colormap (widget);
 256
 257         attributes.x = widget->allocation.x;
 258         attributes.y = widget->allocation.y;
 259         attributes.width = widget->allocation.width;
 260         attributes.height = widget->allocation.height;
 261         attributes.event_mask = 0;
 262
 263         widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
 264                                          &attributes,
 265                                          GDK_WA_X | GDK_WA_Y |
 266                                          GDK_WA_COLORMAP |
 267                                          GDK_WA_VISUAL);
 268         gdk_window_set_user_data (widget->window, widget);
 269         widget->style = gtk_style_attach (widget->style, widget->window);
 270
 271         attributes.x = 0;
 272         attributes.y = 0;
 273         attributes.width = MAX (widget->allocation.width, widget->requisition.width);
 274         attributes.height = MAX (widget->allocation.height, widget->requisition.height);
 275         attributes.event_mask = GDK_EXPOSURE_MASK |
 276                                 GDK_BUTTON_PRESS_MASK |
 277                                 GDK_BUTTON_RELEASE_MASK |
 278                                 GDK_SCROLL_MASK |
 279                                 GDK_KEY_PRESS_MASK |
 280                                 GDK_POINTER_MOTION_MASK;
 281
 282         view->bin_window = gdk_window_new (widget->window,
 283                                            &attributes,
 284                                            GDK_WA_X | GDK_WA_Y |
 285                                            GDK_WA_COLORMAP |
 286                                            GDK_WA_VISUAL);
 287         gdk_window_set_user_data (view->bin_window, widget);
 288         gdk_window_show (view->bin_window);
 289
 290         widget->style = gtk_style_attach (widget->style, view->bin_window);
 291         gdk_window_set_background (view->bin_window, &widget->style->mid[widget->state]);
 292
 293         if (view->document) {
 294                 ev_document_set_target (view->document, view->bin_window);
 295
 296                 /* We can't get page size without a target, so we have to
 297                  * queue a size request at realization. Could be fixed
 298                  * with EvDocument changes to allow setting a GdkScreen
 299                  * without setting a target.
 300                  */
 301                 gtk_widget_queue_resize (widget);
 302         }
 303 }
 304
 305 static void
 306 ev_view_unrealize (GtkWidget *widget)
 307 {
 308         EvView *view = EV_VIEW (widget);
 309
 310         if (view->document)
 311                 ev_document_set_target (view->document, NULL);
 312
 313         gdk_window_set_user_data (view->bin_window, NULL);
 314         gdk_window_destroy (view->bin_window);
 315         view->bin_window = NULL;
 316
 317         GTK_WIDGET_CLASS (ev_view_parent_class)->unrealize (widget);
 318 }
 319
 320 static guint32
 321 ev_gdk_color_to_rgb (const GdkColor *color)
 322 {
 323   guint32 result;
 324   result = (0xff0000 | (color->red & 0xff00));
 325   result <<= 8;
 326   result |= ((color->green & 0xff00) | (color->blue >> 8));
 327   return result;
 328 }
 329
 330 static void
 331 draw_rubberband (GtkWidget *widget, GdkWindow *window,
 332                  const GdkRectangle *rect, guchar alpha)
 333 {
 334         GdkGC *gc;
 335         GdkPixbuf *pixbuf;
 336         GdkColor *fill_color_gdk;
 337         guint fill_color;
 338
 339         fill_color_gdk = gdk_color_copy (&GTK_WIDGET (widget)->style->base[GTK_STATE_SELECTED]);
 340         fill_color = ev_gdk_color_to_rgb (fill_color_gdk) << 8 | alpha;
 341
 342         pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8,
 343                                  rect->width, rect->height);
 344         gdk_pixbuf_fill (pixbuf, fill_color);
 345
 346         gdk_draw_pixbuf (window, NULL, pixbuf,
 347                          0, 0,
 348                          rect->x,rect->y,
 349                          rect->width, rect->height,
 350                          GDK_RGB_DITHER_NONE,
 351                          0, 0);
 352
 353         g_object_unref (pixbuf);
 354
 355         gc = gdk_gc_new (window);
 356         gdk_gc_set_rgb_fg_color (gc, fill_color_gdk);
 357         gdk_draw_rectangle (window, gc, FALSE,
 358                             rect->x, rect->y,
 359                             rect->width - 1,
 360                             rect->height - 1);
 361         g_object_unref (gc);
 362
 363         gdk_color_free (fill_color_gdk);
 364 }
 365
 366 static void
 367 highlight_find_results (EvView *view)
 368 {
 369         EvDocumentFind *find = EV_DOCUMENT_FIND (view->document);
 370         int i, results;
 371
 372         results = ev_document_find_get_n_results (find);
 373
 374         for (i = 0; i < results; i++) {
 375                 GdkRectangle rectangle;
 376                 guchar alpha;
 377
 378                 alpha = (i == view->find_result) ? 0x90 : 0x20;
 379                 ev_document_find_get_result (find, i, &rectangle);
 380                 draw_rubberband (GTK_WIDGET (view), view->bin_window,
 381                                  &rectangle, alpha);
 382         }
 383 }
 384
 385 static void
 386 expose_bin_window (GtkWidget      *widget,
 387                    GdkEventExpose *event)
 388 {
 389         EvView *view = EV_VIEW (widget);
 390         int x_offset, y_offset;
 391
 392         if (view->document == NULL)
 393                 return;
 394
 395         x_offset = MAX (0, (widget->allocation.width -
 396                             widget->requisition.width) / 2);
 397         y_offset = MAX (0, (widget->allocation.height -
 398                             widget->requisition.height) / 2);
 399         gdk_draw_rectangle (view->bin_window,
 400                             widget->style->black_gc,
 401                             FALSE,
 402                             x_offset,
 403                             y_offset,
 404                             widget->requisition.width - 1,
 405                             widget->requisition.height - 1);
 406
 407         ev_document_set_page_offset (view->document,
 408                                      x_offset + 1,
 409                                      y_offset + 1);
 410
 411         ev_document_render (view->document,
 412                             event->area.x, event->area.y,
 413                             event->area.width, event->area.height);
 414
 415         if (EV_IS_DOCUMENT_FIND (view->document)) {
 416                 highlight_find_results (view);
 417         }
 418
 419         if (view->has_selection) {
 420                 draw_rubberband (widget, view->bin_window,
 421                                  &view->selection, 0x40);
 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_start.x = event->x;
 531                         view->selection_start.y = event->y;
 532                         break;
 533         }
 534
 535         return TRUE;
 536 }
 537
 538 static char *
 539 status_message_from_link (EvLink *link)
 540 {
 541         EvLinkType type;
 542         char *msg;
 543         int page;
 544
 545         type = ev_link_get_link_type (link);
 546
 547         switch (type) {
 548                 case EV_LINK_TYPE_TITLE:
 549                         msg = g_strdup (ev_link_get_title (link));
 550                         break;
 551                 case EV_LINK_TYPE_PAGE:
 552                         page = ev_link_get_page (link);
 553                         msg = g_strdup_printf (_("Go to page %d"), page);
 554                         break;
 555                 case EV_LINK_TYPE_EXTERNAL_URI:
 556                         msg = g_strdup (ev_link_get_uri (link));
 557                         break;
 558                 default:
 559                         msg = NULL;
 560         }
 561
 562         return msg;
 563 }
 564
 565 static void
 566 ev_view_set_status (EvView *view, const char *message)
 567 {
 568         g_return_if_fail (EV_IS_VIEW (view));
 569
 570         if (message != view->status) {
 571                 g_free (view->status);
 572                 view->status = g_strdup (message);
 573                 g_object_notify (G_OBJECT (view), "status");
 574         }
 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
 588 static void
 589 ev_view_set_cursor (EvView *view, EvViewCursor new_cursor)
 590 {
 591         GdkCursor *cursor = NULL;
 592         GdkDisplay *display;
 593         GtkWidget *widget;
 594
 595         if (view->cursor == new_cursor) {
 596                 return;
 597         }
 598
 599         widget = gtk_widget_get_toplevel (GTK_WIDGET (view));
 600         display = gtk_widget_get_display (widget);
 601         view->cursor = new_cursor;
 602
 603         switch (new_cursor) {
 604                 case EV_VIEW_CURSOR_NORMAL:
 605                         gdk_window_set_cursor (widget->window, NULL);
 606                         break;
 607                 case EV_VIEW_CURSOR_LINK:
 608                         cursor = gdk_cursor_new_for_display (display, GDK_HAND2);
 609                         break;
 610                 case EV_VIEW_CURSOR_WAIT:
 611                         cursor = gdk_cursor_new_for_display (display, GDK_WATCH);
 612                         break;
 613         }
 614
 615         if (cursor) {
 616                 gdk_window_set_cursor (widget->window, cursor);
 617                 gdk_cursor_unref (cursor);
 618                 gdk_flush();
 619         }
 620 }
 621
 622 static gboolean
 623 ev_view_motion_notify_event (GtkWidget      *widget,
 624                              GdkEventMotion *event)
 625 {
 626         EvView *view = EV_VIEW (widget);
 627
 628         if (view->pressed_button > 0) {
 629                 view->has_selection = TRUE;
 630                 view->selection.x = MIN (view->selection_start.x, event->x);
 631                 view->selection.y = MIN (view->selection_start.y, event->y);
 632                 view->selection.width = ABS (view->selection_start.x - event->x) + 1;
 633                 view->selection.height = ABS (view->selection_start.y - event->y) + 1;
 634
 635                 gtk_widget_queue_draw (widget);
 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         return TRUE;
 658 }
 659
 660 static gboolean
 661 ev_view_button_release_event (GtkWidget      *widget,
 662                               GdkEventButton *event)
 663 {
 664         EvView *view = EV_VIEW (widget);
 665
 666         view->pressed_button = -1;
 667
 668         if (view->has_selection) {
 669                 ev_view_update_primary_selection (view);
 670         } else if (view->document) {
 671                 EvLink *link;
 672
 673                 link = ev_document_get_link (view->document,
 674                                              event->x,
 675                                              event->y);
 676                 if (link) {
 677                         ev_view_go_to_link (view, link);
 678                         g_object_unref (link);
 679                 }
 680         }
 681
 682         return FALSE;
 683 }
 684
 685 static void
 686 on_adjustment_value_changed (GtkAdjustment  *adjustment,
 687                              EvView *view)
 688 {
 689         view_update_adjustments (view);
 690 }
 691
 692 static void
 693 set_scroll_adjustment (EvView *view,
 694                        GtkOrientation  orientation,
 695                        GtkAdjustment  *adjustment)
 696 {
 697         GtkAdjustment **to_set;
 698
 699         if (orientation == GTK_ORIENTATION_HORIZONTAL)
 700                 to_set = &view->hadjustment;
 701         else
 702                 to_set = &view->vadjustment;
 703
 704         if (*to_set != adjustment) {
 705                 if (*to_set) {
 706                         g_signal_handlers_disconnect_by_func (*to_set,
 707                                                               (gpointer) on_adjustment_value_changed,
 708                                                               view);
 709                         g_object_unref (*to_set);
 710                 }
 711
 712                 *to_set = adjustment;
 713                 view_set_adjustment_values (view, orientation);
 714
 715                 if (*to_set) {
 716                         g_object_ref (*to_set);
 717                         g_signal_connect (*to_set, "value_changed",
 718                                           G_CALLBACK (on_adjustment_value_changed), view);
 719                 }
 720         }
 721 }
 722
 723 static void
 724 ev_view_set_scroll_adjustments (EvView *view,
 725                                 GtkAdjustment  *hadjustment,
 726                                 GtkAdjustment  *vadjustment)
 727 {
 728         set_scroll_adjustment (view, GTK_ORIENTATION_HORIZONTAL, hadjustment);
 729         set_scroll_adjustment (view, GTK_ORIENTATION_VERTICAL, vadjustment);
 730
 731         view_update_adjustments (view);
 732 }
 733
 734 static void
 735 add_scroll_binding (GtkBindingSet  *binding_set,
 736                     guint           keyval,
 737                     GtkScrollType   scroll,
 738                     gboolean        horizontal)
 739 {
 740   guint keypad_keyval = keyval - GDK_Left + GDK_KP_Left;
 741
 742   gtk_binding_entry_add_signal (binding_set, keyval, 0,
 743                                 "scroll_view", 2,
 744                                 GTK_TYPE_SCROLL_TYPE, scroll,
 745                                 G_TYPE_BOOLEAN, horizontal);
 746   gtk_binding_entry_add_signal (binding_set, keypad_keyval, 0,
 747                                 "scroll_view", 2,
 748                                 GTK_TYPE_SCROLL_TYPE, scroll,
 749                                 G_TYPE_BOOLEAN, horizontal);
 750 }
 751
 752 static void
 753 ev_view_scroll_view (EvView *view,
 754                      GtkScrollType scroll,
 755                      gboolean horizontal)
 756 {
 757         if (scroll == GTK_SCROLL_PAGE_BACKWARD) {
 758                 ev_view_set_page (view, ev_view_get_page (view) - 1);
 759         } else if (scroll == GTK_SCROLL_PAGE_FORWARD) {
 760                 ev_view_set_page (view, ev_view_get_page (view) + 1);
 761         } else {
 762                 GtkAdjustment *adjustment;
 763                 double value;
 764
 765                 if (horizontal) {
 766                         adjustment = view->hadjustment;
 767                 } else {
 768                         adjustment = view->vadjustment;
 769                 }
 770
 771                 value = adjustment->value;
 772
 773                 switch (scroll) {
 774                         case GTK_SCROLL_STEP_BACKWARD:
 775                                 value -= adjustment->step_increment;
 776                                 break;
 777                         case GTK_SCROLL_STEP_FORWARD:
 778                                 value += adjustment->step_increment;
 779                                 break;
 780                         default:
 781                                 break;
 782                 }
 783
 784                 value = CLAMP (value, adjustment->lower,
 785                                adjustment->upper - adjustment->page_size);
 786
 787                 gtk_adjustment_set_value (adjustment, value);
 788         }
 789 }
 790
 791 static void
 792 ev_view_set_property (GObject *object,
 793                       guint prop_id,
 794                       const GValue *value,
 795                       GParamSpec *pspec)
 796 {
 797         switch (prop_id)
 798         {
 799                 /* Read only */
 800                 case PROP_STATUS:
 801                 case PROP_FIND_STATUS:
 802                         break;
 803         }
 804 }
 805
 806 static void
 807 ev_view_get_property (GObject *object,
 808                       guint prop_id,
 809                       GValue *value,
 810                       GParamSpec *pspec)
 811 {
 812         EvView *view = EV_VIEW (object);
 813
 814         switch (prop_id)
 815         {
 816                 case PROP_STATUS:
 817                         g_value_set_string (value, view->status);
 818                         break;
 819                 case PROP_FIND_STATUS:
 820                         g_value_set_string (value, view->status);
 821                         break;
 822         }
 823 }
 824
 825 static void
 826 ev_view_class_init (EvViewClass *class)
 827 {
 828         GObjectClass *object_class = G_OBJECT_CLASS (class);
 829         GtkObjectClass *gtk_object_class = GTK_OBJECT_CLASS (class);
 830         GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
 831         GtkBindingSet *binding_set;
 832
 833         object_class->finalize = ev_view_finalize;
 834         object_class->set_property = ev_view_set_property;
 835         object_class->get_property = ev_view_get_property;
 836
 837         widget_class->expose_event = ev_view_expose_event;
 838         widget_class->button_press_event = ev_view_button_press_event;
 839         widget_class->motion_notify_event = ev_view_motion_notify_event;
 840         widget_class->button_release_event = ev_view_button_release_event;
 841         widget_class->size_request = ev_view_size_request;
 842         widget_class->size_allocate = ev_view_size_allocate;
 843         widget_class->realize = ev_view_realize;
 844         widget_class->unrealize = ev_view_unrealize;
 845         gtk_object_class->destroy = ev_view_destroy;
 846
 847         class->set_scroll_adjustments = ev_view_set_scroll_adjustments;
 848         class->scroll_view = ev_view_scroll_view;
 849
 850         widget_class->set_scroll_adjustments_signal =  g_signal_new ("set-scroll-adjustments",
 851                                                                      G_OBJECT_CLASS_TYPE (object_class),
 852                                                                      G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 853                                                                      G_STRUCT_OFFSET (EvViewClass, set_scroll_adjustments),
 854                                                                      NULL, NULL,
 855                                                                      ev_marshal_VOID__OBJECT_OBJECT,
 856                                                                      G_TYPE_NONE, 2,
 857                                                                      GTK_TYPE_ADJUSTMENT,
 858                                                                      GTK_TYPE_ADJUSTMENT);
 859         page_changed_signal = g_signal_new ("page-changed",
 860                                             G_OBJECT_CLASS_TYPE (object_class),
 861                                             G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 862                                             G_STRUCT_OFFSET (EvViewClass, page_changed),
 863                                             NULL, NULL,
 864                                             ev_marshal_VOID__NONE,
 865                                             G_TYPE_NONE, 0);
 866
 867         g_signal_new ("scroll_view",
 868                       G_TYPE_FROM_CLASS (object_class),
 869                       G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 870                       G_STRUCT_OFFSET (EvViewClass, scroll_view),
 871                       NULL, NULL,
 872                       ev_marshal_VOID__ENUM_BOOLEAN,
 873                       G_TYPE_NONE, 2,
 874                       GTK_TYPE_SCROLL_TYPE,
 875                       G_TYPE_BOOLEAN);
 876
 877         g_object_class_install_property (object_class,
 878                                          PROP_STATUS,
 879                                          g_param_spec_string ("status",
 880                                                               "Status Message",
 881                                                               "The status message",
 882                                                               NULL,
 883                                                               G_PARAM_READABLE));
 884
 885         g_object_class_install_property (object_class,
 886                                          PROP_STATUS,
 887                                          g_param_spec_string ("find-status",
 888                                                               "Find Status Message",
 889                                                               "The find status message",
 890                                                               NULL,
 891                                                               G_PARAM_READABLE));
 892
 893         binding_set = gtk_binding_set_by_class (class);
 894
 895         add_scroll_binding (binding_set, GDK_Left,  GTK_SCROLL_STEP_BACKWARD, TRUE);
 896         add_scroll_binding (binding_set, GDK_Right, GTK_SCROLL_STEP_FORWARD,  TRUE);
 897         add_scroll_binding (binding_set, GDK_Up,    GTK_SCROLL_STEP_BACKWARD, FALSE);
 898         add_scroll_binding (binding_set, GDK_Down,  GTK_SCROLL_STEP_FORWARD,  FALSE);
 899
 900         add_scroll_binding (binding_set, GDK_Page_Up,   GTK_SCROLL_PAGE_BACKWARD, FALSE);
 901         add_scroll_binding (binding_set, GDK_Page_Down, GTK_SCROLL_PAGE_FORWARD,  FALSE);
 902 }
 903
 904 static void
 905 ev_view_init (EvView *view)
 906 {
 907         GTK_WIDGET_SET_FLAGS (view, GTK_CAN_FOCUS);
 908
 909         view->scale = 1.0;
 910         view->pressed_button = -1;
 911         view->cursor = EV_VIEW_CURSOR_NORMAL;
 912 }
 913
 914 static void
 915 update_find_status_message (EvView *view)
 916 {
 917         char *message;
 918
 919         if (ev_document_get_page (view->document) == view->find_page) {
 920                 int results;
 921
 922                 results = ev_document_find_get_n_results
 923                                 (EV_DOCUMENT_FIND (view->document));
 924
 925                 message = g_strdup_printf (_("%d found on this page"),
 926                                            results);
 927         } else {
 928                 double percent;
 929
 930                 percent = ev_document_find_get_progress
 931                                 (EV_DOCUMENT_FIND (view->document));
 932
 933                 if (percent >= (1.0 - 1e-10)) {
 934                         message = g_strdup (_("Not found"));
 935                 } else {
 936                         message = g_strdup_printf (_("%3d%% remaining to search"),
 937                                                    (int) ((1.0 - percent) * 100));
 938                 }
 939
 940         }
 941
 942         ev_view_set_find_status (view, message);
 943         g_free (message);
 944 }
 945
 946 static void
 947 set_document_page (EvView *view, int new_page)
 948 {
 949         int page;
 950         int pages;
 951
 952         pages = ev_document_get_n_pages (view->document);
 953         page = CLAMP (new_page, 1, pages);
 954
 955         if (view->document) {
 956                 int old_page = ev_document_get_page (view->document);
 957                 int old_width, old_height;
 958
 959                 ev_document_get_page_size (view->document,
 960                                            -1,
 961                                            &old_width, &old_height);
 962
 963                 if (old_page != page) {
 964                         ev_view_set_cursor (view, EV_VIEW_CURSOR_WAIT);
 965                         ev_document_set_page (view->document, page);
 966                 }
 967
 968                 if (old_page != ev_document_get_page (view->document)) {
 969                         int width, height;
 970
 971                         g_signal_emit (view, page_changed_signal, 0);
 972
 973                         view->has_selection = FALSE;
 974                         ev_document_get_page_size (view->document,
 975                                                    -1,
 976                                                    &width, &height);
 977                         if (width != old_width || height != old_height)
 978                                 gtk_widget_queue_resize (GTK_WIDGET (view));
 979
 980                         gtk_adjustment_set_value (view->vadjustment,
 981                                                   view->vadjustment->lower);
 982                 }
 983
 984                 view->find_page = page;
 985                 view->find_result = 0;
 986                 update_find_status_message (view);
 987         }
 988 }
 989
 990 #define MARGIN 5
 991
 992 static void
 993 ensure_rectangle_is_visible (EvView *view, GdkRectangle *rect)
 994 {
 995         GtkWidget *widget = GTK_WIDGET (view);
 996         GtkAdjustment *adjustment;
 997         int value;
 998
 999         adjustment = view->vadjustment;
1000
1001         if (rect->y < adjustment->value) {
1002                 value = MAX (adjustment->lower, rect->y - MARGIN);
1003                 gtk_adjustment_set_value (view->vadjustment, value);
1004         } else if (rect->y + rect->height >
1005                    adjustment->value + widget->allocation.height) {
1006                 value = MIN (adjustment->upper, rect->y + rect->height -
1007                              widget->allocation.height + MARGIN);
1008                 gtk_adjustment_set_value (view->vadjustment, value);
1009         }
1010
1011         adjustment = view->hadjustment;
1012
1013         if (rect->x < adjustment->value) {
1014                 value = MAX (adjustment->lower, rect->x - MARGIN);
1015                 gtk_adjustment_set_value (view->hadjustment, value);
1016         } else if (rect->x + rect->height >
1017                    adjustment->value + widget->allocation.width) {
1018                 value = MIN (adjustment->upper, rect->x + rect->width -
1019                              widget->allocation.width + MARGIN);
1020                 gtk_adjustment_set_value (view->hadjustment, value);
1021         }
1022 }
1023
1024 static void
1025 jump_to_find_result (EvView *view)
1026 {
1027         EvDocumentFind *find = EV_DOCUMENT_FIND (view->document);
1028         GdkRectangle rect;
1029         int n_results;
1030
1031         n_results = ev_document_find_get_n_results (find);
1032
1033         if (n_results > view->find_result) {
1034                 ev_document_find_get_result
1035                         (find, view->find_result, &rect);
1036                 ensure_rectangle_is_visible (view, &rect);
1037         }
1038 }
1039
1040 static void
1041 jump_to_find_page (EvView *view)
1042 {
1043         int n_pages, i;
1044
1045         n_pages = ev_document_get_n_pages (view->document);
1046
1047         for (i = 0; i <= n_pages; i++) {
1048                 int has_results;
1049                 int page;
1050
1051                 page = i + view->find_page;
1052                 if (page > n_pages) {
1053                         page = page - n_pages;
1054                 }
1055
1056                 has_results = ev_document_find_page_has_results
1057                                 (EV_DOCUMENT_FIND (view->document), page);
1058                 if (has_results == -1) {
1059                         view->find_page = page;
1060                         break;
1061                 } else if (has_results == 1) {
1062                         set_document_page (view, page);
1063                         jump_to_find_result (view);
1064                         break;
1065                 }
1066         }
1067 }
1068
1069 static void
1070 find_changed_cb (EvDocument *document, int page, EvView *view)
1071 {
1072         jump_to_find_page (view);
1073         jump_to_find_result (view);
1074         update_find_status_message (view);
1075
1076         if (ev_document_get_page (document) == page) {
1077                 gtk_widget_queue_draw (GTK_WIDGET (view));
1078         }
1079 }
1080
1081 static void
1082 document_changed_callback (EvDocument *document,
1083                            EvView     *view)
1084 {
1085         gtk_widget_queue_draw (GTK_WIDGET (view));
1086         ev_view_set_cursor (view, EV_VIEW_CURSOR_NORMAL);
1087 }
1088
1089 /*** Public API ***/
1090
1091 GtkWidget*
1092 ev_view_new (void)
1093 {
1094         return g_object_new (EV_TYPE_VIEW, NULL);
1095 }
1096
1097 void
1098 ev_view_set_document (EvView     *view,
1099                       EvDocument *document)
1100 {
1101         g_return_if_fail (EV_IS_VIEW (view));
1102
1103         if (document != view->document) {
1104                 if (view->document) {
1105                         g_signal_handlers_disconnect_by_func
1106                                 (view->document, find_changed_cb, view);
1107                         g_object_unref (view->document);
1108                 }
1109
1110                 view->document = document;
1111                 view->find_page = 1;
1112                 view->find_result = 0;
1113
1114                 if (view->document) {
1115                         g_object_ref (view->document);
1116                         if (EV_IS_DOCUMENT_FIND (view->document)) {
1117                                 g_signal_connect (view->document,
1118                                                   "find_changed",
1119                                                   G_CALLBACK (find_changed_cb),
1120                                                   view);
1121                         }
1122                         g_signal_connect (view->document,
1123                                           "changed",
1124                                           G_CALLBACK (document_changed_callback),
1125                                           view);
1126                 }
1127
1128                 if (GTK_WIDGET_REALIZED (view))
1129                         ev_document_set_target (view->document, view->bin_window);
1130
1131                 gtk_widget_queue_resize (GTK_WIDGET (view));
1132
1133                 g_signal_emit (view, page_changed_signal, 0);
1134         }
1135 }
1136
1137 static void
1138 go_to_link (EvView *view, EvLink *link)
1139 {
1140         EvLinkType type;
1141         const char *uri;
1142         int page;
1143
1144         type = ev_link_get_link_type (link);
1145
1146         switch (type) {
1147                 case EV_LINK_TYPE_TITLE:
1148                         break;
1149                 case EV_LINK_TYPE_PAGE:
1150                         page = ev_link_get_page (link);
1151                         set_document_page (view, page);
1152                         break;
1153                 case EV_LINK_TYPE_EXTERNAL_URI:
1154                         uri = ev_link_get_uri (link);
1155                         gnome_vfs_url_show (uri);
1156                         break;
1157         }
1158 }
1159
1160 void
1161 ev_view_go_to_link (EvView *view, EvLink *link)
1162 {
1163         go_to_link (view, link);
1164 }
1165
1166 void
1167 ev_view_set_page (EvView *view,
1168                   int     page)
1169 {
1170         g_return_if_fail (EV_IS_VIEW (view));
1171
1172         set_document_page (view, page);
1173 }
1174
1175 int
1176 ev_view_get_page (EvView *view)
1177 {
1178         if (view->document)
1179                 return ev_document_get_page (view->document);
1180         else
1181                 return 1;
1182 }
1183
1184 #define ZOOM_IN_FACTOR  1.2
1185 #define ZOOM_OUT_FACTOR (1.0/ZOOM_IN_FACTOR)
1186
1187 #define MIN_SCALE 0.05409
1188 #define MAX_SCALE 18.4884
1189
1190 static void
1191 ev_view_zoom (EvView   *view,
1192               double    factor,
1193               gboolean  relative)
1194 {
1195         double scale;
1196
1197         if (relative)
1198                 scale = view->scale * factor;
1199         else
1200                 scale = factor;
1201
1202         view->scale = CLAMP (scale, MIN_SCALE, MAX_SCALE);
1203
1204         ev_document_set_scale (view->document, view->scale);
1205
1206         gtk_widget_queue_resize (GTK_WIDGET (view));
1207 }
1208
1209 void
1210 ev_view_zoom_in (EvView *view)
1211 {
1212         ev_view_zoom (view, ZOOM_IN_FACTOR, TRUE);
1213 }
1214
1215 void
1216 ev_view_zoom_out (EvView *view)
1217 {
1218         ev_view_zoom (view, ZOOM_OUT_FACTOR, TRUE);
1219 }
1220
1221 void
1222 ev_view_normal_size (EvView *view)
1223 {
1224         ev_view_zoom (view, 1.0, FALSE);
1225 }
1226
1227 void
1228 ev_view_best_fit (EvView *view)
1229 {
1230         double scale;
1231         int width, height;
1232
1233         width = height = 0;
1234         ev_document_get_page_size (view->document, -1, &width, &height);
1235
1236         scale = 1.0;
1237         if (width != 0 && height != 0) {
1238                 double scale_w, scale_h;
1239
1240                 scale_w = (double)GTK_WIDGET (view)->allocation.width * view->scale / width;
1241                 scale_h = (double)GTK_WIDGET (view)->allocation.height * view->scale / height;
1242
1243                 scale = (scale_w < scale_h) ? scale_w : scale_h;
1244         }
1245
1246         ev_view_zoom (view, scale, FALSE);
1247 }
1248
1249 void
1250 ev_view_fit_width (EvView *view)
1251 {
1252         double scale = 1.0;
1253         int width;
1254
1255         width = 0;
1256         ev_document_get_page_size (view->document, -1, &width, NULL);
1257
1258         scale = 1.0;
1259         if (width != 0)
1260                 scale = (double)GTK_WIDGET (view)->allocation.width * view->scale / width;
1261
1262         ev_view_zoom (view, scale, FALSE);
1263 }
1264
1265 const char *
1266 ev_view_get_status (EvView *view)
1267 {
1268         g_return_val_if_fail (EV_IS_VIEW (view), NULL);
1269
1270         return view->status;
1271 }
1272
1273 const char *
1274 ev_view_get_find_status (EvView *view)
1275 {
1276         g_return_val_if_fail (EV_IS_VIEW (view), NULL);
1277
1278         return view->find_status;
1279 }
1280
1281 void
1282 ev_view_find_next (EvView *view)
1283 {
1284         int n_results, n_pages;
1285         EvDocumentFind *find = EV_DOCUMENT_FIND (view->document);
1286
1287         n_results = ev_document_find_get_n_results (find);
1288         n_pages = ev_document_get_n_pages (view->document);
1289
1290         view->find_result++;
1291
1292         if (view->find_result >= n_results) {
1293                 view->find_result = 0;
1294                 view->find_page++;
1295
1296                 if (view->find_page > n_pages) {
1297                         view->find_page = 1;
1298                 }
1299
1300                 jump_to_find_page (view);
1301         } else {
1302                 jump_to_find_result (view);
1303                 gtk_widget_queue_draw (GTK_WIDGET (view));
1304         }
1305 }
1306
1307 void
1308 ev_view_find_previous (EvView *view)
1309 {
1310         int n_results, n_pages;
1311         EvDocumentFind *find = EV_DOCUMENT_FIND (view->document);
1312
1313         n_results = ev_document_find_get_n_results (find);
1314         n_pages = ev_document_get_n_pages (view->document);
1315
1316         view->find_result--;
1317
1318         if (view->find_result < 0) {
1319                 view->find_result = 0;
1320                 view->find_page--;
1321
1322                 if (view->find_page < 1) {
1323                         view->find_page = n_pages;
1324                 }
1325
1326                 jump_to_find_page (view);
1327         } else {
1328                 jump_to_find_result (view);
1329                 gtk_widget_queue_draw (GTK_WIDGET (view));
1330         }
1331 }