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                                                    &requisition->width,
 213                                                    &requisition->height);
 214                 } else {
 215                         requisition->width = 10;
 216                         requisition->height = 10;
 217                 }
 218
 219                 requisition->width += 2;
 220                 requisition->height += 2;
 221         }
 222
 223 }
 224
 225 static void
 226 ev_view_size_allocate (GtkWidget      *widget,
 227                        GtkAllocation  *allocation)
 228 {
 229         EvView *view = EV_VIEW (widget);
 230
 231         GTK_WIDGET_CLASS (ev_view_parent_class)->size_allocate (widget, allocation);
 232
 233         view_set_adjustment_values (view, GTK_ORIENTATION_HORIZONTAL);
 234         view_set_adjustment_values (view, GTK_ORIENTATION_VERTICAL);
 235
 236         if (GTK_WIDGET_REALIZED (widget)) {
 237                 gdk_window_resize (view->bin_window,
 238                                    MAX (widget->allocation.width, widget->requisition.width),
 239                                    MAX (widget->allocation.height, widget->requisition.height));
 240         }
 241 }
 242
 243 static void
 244 ev_view_realize (GtkWidget *widget)
 245 {
 246         EvView *view = EV_VIEW (widget);
 247         GdkWindowAttr attributes;
 248
 249         GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 250
 251         attributes.window_type = GDK_WINDOW_CHILD;
 252         attributes.wclass = GDK_INPUT_OUTPUT;
 253         attributes.visual = gtk_widget_get_visual (widget);
 254         attributes.colormap = gtk_widget_get_colormap (widget);
 255
 256         attributes.x = widget->allocation.x;
 257         attributes.y = widget->allocation.y;
 258         attributes.width = widget->allocation.width;
 259         attributes.height = widget->allocation.height;
 260         attributes.event_mask = 0;
 261
 262         widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
 263                                          &attributes,
 264                                          GDK_WA_X | GDK_WA_Y |
 265                                          GDK_WA_COLORMAP |
 266                                          GDK_WA_VISUAL);
 267         gdk_window_set_user_data (widget->window, widget);
 268         widget->style = gtk_style_attach (widget->style, widget->window);
 269
 270         attributes.x = 0;
 271         attributes.y = 0;
 272         attributes.width = MAX (widget->allocation.width, widget->requisition.width);
 273         attributes.height = MAX (widget->allocation.height, widget->requisition.height);
 274         attributes.event_mask = GDK_EXPOSURE_MASK |
 275                                 GDK_BUTTON_PRESS_MASK |
 276                                 GDK_BUTTON_RELEASE_MASK |
 277                                 GDK_SCROLL_MASK |
 278                                 GDK_KEY_PRESS_MASK |
 279                                 GDK_POINTER_MOTION_MASK;
 280
 281         view->bin_window = gdk_window_new (widget->window,
 282                                            &attributes,
 283                                            GDK_WA_X | GDK_WA_Y |
 284                                            GDK_WA_COLORMAP |
 285                                            GDK_WA_VISUAL);
 286         gdk_window_set_user_data (view->bin_window, widget);
 287         gdk_window_show (view->bin_window);
 288
 289         widget->style = gtk_style_attach (widget->style, view->bin_window);
 290         gdk_window_set_background (view->bin_window, &widget->style->mid[widget->state]);
 291
 292         if (view->document) {
 293                 ev_document_set_target (view->document, view->bin_window);
 294
 295                 /* We can't get page size without a target, so we have to
 296                  * queue a size request at realization. Could be fixed
 297                  * with EvDocument changes to allow setting a GdkScreen
 298                  * without setting a target.
 299                  */
 300                 gtk_widget_queue_resize (widget);
 301         }
 302 }
 303
 304 static void
 305 ev_view_unrealize (GtkWidget *widget)
 306 {
 307         EvView *view = EV_VIEW (widget);
 308
 309         if (view->document)
 310                 ev_document_set_target (view->document, NULL);
 311
 312         gdk_window_set_user_data (view->bin_window, NULL);
 313         gdk_window_destroy (view->bin_window);
 314         view->bin_window = NULL;
 315
 316         GTK_WIDGET_CLASS (ev_view_parent_class)->unrealize (widget);
 317 }
 318
 319 static guint32
 320 ev_gdk_color_to_rgb (const GdkColor *color)
 321 {
 322   guint32 result;
 323   result = (0xff0000 | (color->red & 0xff00));
 324   result <<= 8;
 325   result |= ((color->green & 0xff00) | (color->blue >> 8));
 326   return result;
 327 }
 328
 329 static void
 330 draw_rubberband (GtkWidget *widget, GdkWindow *window,
 331                  const GdkRectangle *rect, gboolean dark)
 332 {
 333         GdkGC *gc;
 334         GdkPixbuf *pixbuf;
 335         GdkColor *fill_color_gdk;
 336         guint fill_color;
 337
 338         fill_color_gdk = gdk_color_copy (&GTK_WIDGET (widget)->style->base[GTK_STATE_SELECTED]);
 339         fill_color = ev_gdk_color_to_rgb (fill_color_gdk) << 8 |
 340                      (dark ? 0x90 : 0x40);
 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                 gboolean current;
 377
 378                 current = (i == view->find_result);
 379                 ev_document_find_get_result (find, i, &rectangle);
 380                 draw_rubberband (GTK_WIDGET (view), view->bin_window,
 381                                  &rectangle, current);
 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         highlight_find_results (view);
 416
 417         if (view->has_selection) {
 418                 draw_rubberband (widget, view->bin_window,
 419                                  &view->selection, FALSE);
 420         }
 421 }
 422
 423 static gboolean
 424 ev_view_expose_event (GtkWidget      *widget,
 425                       GdkEventExpose *event)
 426 {
 427         EvView *view = EV_VIEW (widget);
 428
 429         if (event->window == view->bin_window)
 430                 expose_bin_window (widget, event);
 431         else
 432                 return GTK_WIDGET_CLASS (ev_view_parent_class)->expose_event (widget, event);
 433
 434         return FALSE;
 435 }
 436
 437 void
 438 ev_view_select_all (EvView *ev_view)
 439 {
 440         GtkWidget *widget = GTK_WIDGET (ev_view);
 441
 442         g_return_if_fail (EV_IS_VIEW (ev_view));
 443
 444         ev_view->has_selection = TRUE;
 445         ev_view->selection.x = ev_view->selection.y = 0;
 446         ev_view->selection.width = widget->requisition.width;
 447         ev_view->selection.height = widget->requisition.height;
 448
 449         gtk_widget_queue_draw (widget);
 450 }
 451
 452 void
 453 ev_view_copy (EvView *ev_view)
 454 {
 455         GtkClipboard *clipboard;
 456         char *text;
 457
 458         text = ev_document_get_text (ev_view->document, &ev_view->selection);
 459         clipboard = gtk_widget_get_clipboard (GTK_WIDGET (ev_view),
 460                                               GDK_SELECTION_CLIPBOARD);
 461         gtk_clipboard_set_text (clipboard, text, -1);
 462         g_free (text);
 463 }
 464
 465 static void
 466 ev_view_primary_get_cb (GtkClipboard     *clipboard,
 467                         GtkSelectionData *selection_data,
 468                         guint             info,
 469                         gpointer          data)
 470 {
 471         EvView *ev_view = EV_VIEW (data);
 472         char *text;
 473
 474         text = ev_document_get_text (ev_view->document, &ev_view->selection);
 475         gtk_selection_data_set_text (selection_data, text, -1);
 476 }
 477
 478 static void
 479 ev_view_primary_clear_cb (GtkClipboard *clipboard,
 480                           gpointer      data)
 481 {
 482         EvView *ev_view = EV_VIEW (data);
 483
 484         ev_view->has_selection = FALSE;
 485 }
 486
 487 static void
 488 ev_view_update_primary_selection (EvView *ev_view)
 489 {
 490         GtkClipboard *clipboard;
 491
 492         clipboard = gtk_widget_get_clipboard (GTK_WIDGET (ev_view),
 493                                               GDK_SELECTION_PRIMARY);
 494
 495         if (ev_view->has_selection) {
 496                 if (!gtk_clipboard_set_with_owner (clipboard,
 497                                                    targets,
 498                                                    G_N_ELEMENTS (targets),
 499                                                    ev_view_primary_get_cb,
 500                                                    ev_view_primary_clear_cb,
 501                                                    G_OBJECT (ev_view)))
 502                         ev_view_primary_clear_cb (clipboard, ev_view);
 503         } else {
 504                 if (gtk_clipboard_get_owner (clipboard) == G_OBJECT (ev_view))
 505                         gtk_clipboard_clear (clipboard);
 506         }
 507 }
 508
 509 static gboolean
 510 ev_view_button_press_event (GtkWidget      *widget,
 511                             GdkEventButton *event)
 512 {
 513         EvView *view = EV_VIEW (widget);
 514
 515         if (!GTK_WIDGET_HAS_FOCUS (widget)) {
 516                 gtk_widget_grab_focus (widget);
 517         }
 518
 519         view->pressed_button = event->button;
 520
 521         switch (event->button) {
 522                 case 1:
 523                         if (view->has_selection) {
 524                                 view->has_selection = FALSE;
 525                                 gtk_widget_queue_draw (widget);
 526                         }
 527
 528                         view->selection_start.x = event->x;
 529                         view->selection_start.y = event->y;
 530                         break;
 531         }
 532
 533         return TRUE;
 534 }
 535
 536 static char *
 537 status_message_from_link (EvLink *link)
 538 {
 539         EvLinkType type;
 540         char *msg;
 541         int page;
 542
 543         type = ev_link_get_link_type (link);
 544
 545         switch (type) {
 546                 case EV_LINK_TYPE_TITLE:
 547                         msg = g_strdup (ev_link_get_title (link));
 548                         break;
 549                 case EV_LINK_TYPE_PAGE:
 550                         page = ev_link_get_page (link);
 551                         msg = g_strdup_printf (_("Go to page %d"), page);
 552                         break;
 553                 case EV_LINK_TYPE_EXTERNAL_URI:
 554                         msg = g_strdup (ev_link_get_uri (link));
 555                         break;
 556                 default:
 557                         msg = NULL;
 558         }
 559
 560         return msg;
 561 }
 562
 563 static void
 564 ev_view_set_status (EvView *view, const char *message)
 565 {
 566         g_return_if_fail (EV_IS_VIEW (view));
 567
 568         if (message != view->status) {
 569                 g_free (view->status);
 570                 view->status = g_strdup (message);
 571                 g_object_notify (G_OBJECT (view), "status");
 572         }
 573 }
 574
 575 static void
 576 ev_view_set_find_status (EvView *view, const char *message)
 577 {
 578         g_return_if_fail (EV_IS_VIEW (view));
 579
 580         g_free (view->find_status);
 581         view->find_status = g_strdup (message);
 582         g_object_notify (G_OBJECT (view), "find-status");
 583 }
 584
 585
 586 static void
 587 ev_view_set_cursor (EvView *view, EvViewCursor new_cursor)
 588 {
 589         GdkCursor *cursor = NULL;
 590         GdkDisplay *display;
 591         GtkWidget *widget;
 592
 593         if (view->cursor == new_cursor) {
 594                 return;
 595         }
 596
 597         widget = gtk_widget_get_toplevel (GTK_WIDGET (view));
 598         display = gtk_widget_get_display (widget);
 599         view->cursor = new_cursor;
 600
 601         switch (new_cursor) {
 602                 case EV_VIEW_CURSOR_NORMAL:
 603                         gdk_window_set_cursor (widget->window, NULL);
 604                         break;
 605                 case EV_VIEW_CURSOR_LINK:
 606                         cursor = gdk_cursor_new_for_display (display, GDK_HAND2);
 607                         break;
 608                 case EV_VIEW_CURSOR_WAIT:
 609                         cursor = gdk_cursor_new_for_display (display, GDK_WATCH);
 610                         break;
 611         }
 612
 613         if (cursor) {
 614                 gdk_window_set_cursor (widget->window, cursor);
 615                 gdk_cursor_unref (cursor);
 616                 gdk_flush();
 617         }
 618 }
 619
 620 static gboolean
 621 ev_view_motion_notify_event (GtkWidget      *widget,
 622                              GdkEventMotion *event)
 623 {
 624         EvView *view = EV_VIEW (widget);
 625
 626         if (view->pressed_button > 0) {
 627                 view->has_selection = TRUE;
 628                 view->selection.x = MIN (view->selection_start.x, event->x);
 629                 view->selection.y = MIN (view->selection_start.y, event->y);
 630                 view->selection.width = ABS (view->selection_start.x - event->x) + 1;
 631                 view->selection.height = ABS (view->selection_start.y - event->y) + 1;
 632         } else if (view->document) {
 633                 EvLink *link;
 634
 635                 link = ev_document_get_link (view->document, event->x, event->y);
 636                 if (link) {
 637                         char *msg;
 638
 639                         msg = status_message_from_link (link);
 640                         ev_view_set_status (view, msg);
 641                         ev_view_set_cursor (view, EV_VIEW_CURSOR_LINK);
 642                         g_free (msg);
 643
 644                         g_object_unref (link);
 645                 } else {
 646                         ev_view_set_status (view, NULL);
 647                         if (view->cursor == EV_VIEW_CURSOR_LINK) {
 648                                 ev_view_set_cursor (view, EV_VIEW_CURSOR_NORMAL);
 649                         }
 650                 }
 651         }
 652
 653         gtk_widget_queue_draw (widget);
 654
 655         return TRUE;
 656 }
 657
 658 static gboolean
 659 ev_view_button_release_event (GtkWidget      *widget,
 660                               GdkEventButton *event)
 661 {
 662         EvView *view = EV_VIEW (widget);
 663
 664         view->pressed_button = -1;
 665
 666         if (view->has_selection) {
 667                 ev_view_update_primary_selection (view);
 668         } else if (view->document) {
 669                 EvLink *link;
 670
 671                 link = ev_document_get_link (view->document,
 672                                              event->x,
 673                                              event->y);
 674                 if (link) {
 675                         ev_view_go_to_link (view, link);
 676                         g_object_unref (link);
 677                 }
 678         }
 679
 680         return FALSE;
 681 }
 682
 683 static void
 684 on_adjustment_value_changed (GtkAdjustment  *adjustment,
 685                              EvView *view)
 686 {
 687         view_update_adjustments (view);
 688 }
 689
 690 static void
 691 set_scroll_adjustment (EvView *view,
 692                        GtkOrientation  orientation,
 693                        GtkAdjustment  *adjustment)
 694 {
 695         GtkAdjustment **to_set;
 696
 697         if (orientation == GTK_ORIENTATION_HORIZONTAL)
 698                 to_set = &view->hadjustment;
 699         else
 700                 to_set = &view->vadjustment;
 701
 702         if (*to_set != adjustment) {
 703                 if (*to_set) {
 704                         g_signal_handlers_disconnect_by_func (*to_set,
 705                                                               (gpointer) on_adjustment_value_changed,
 706                                                               view);
 707                         g_object_unref (*to_set);
 708                 }
 709
 710                 *to_set = adjustment;
 711                 view_set_adjustment_values (view, orientation);
 712
 713                 if (*to_set) {
 714                         g_object_ref (*to_set);
 715                         g_signal_connect (*to_set, "value_changed",
 716                                           G_CALLBACK (on_adjustment_value_changed), view);
 717                 }
 718         }
 719 }
 720
 721 static void
 722 ev_view_set_scroll_adjustments (EvView *view,
 723                                 GtkAdjustment  *hadjustment,
 724                                 GtkAdjustment  *vadjustment)
 725 {
 726         set_scroll_adjustment (view, GTK_ORIENTATION_HORIZONTAL, hadjustment);
 727         set_scroll_adjustment (view, GTK_ORIENTATION_VERTICAL, vadjustment);
 728
 729         view_update_adjustments (view);
 730 }
 731
 732 static void
 733 add_scroll_binding (GtkBindingSet  *binding_set,
 734                     guint           keyval,
 735                     GtkScrollType   scroll,
 736                     gboolean        horizontal)
 737 {
 738   guint keypad_keyval = keyval - GDK_Left + GDK_KP_Left;
 739
 740   gtk_binding_entry_add_signal (binding_set, keyval, 0,
 741                                 "scroll_view", 2,
 742                                 GTK_TYPE_SCROLL_TYPE, scroll,
 743                                 G_TYPE_BOOLEAN, horizontal);
 744   gtk_binding_entry_add_signal (binding_set, keypad_keyval, 0,
 745                                 "scroll_view", 2,
 746                                 GTK_TYPE_SCROLL_TYPE, scroll,
 747                                 G_TYPE_BOOLEAN, horizontal);
 748 }
 749
 750 static void
 751 ev_view_scroll_view (EvView *view,
 752                      GtkScrollType scroll,
 753                      gboolean horizontal)
 754 {
 755         if (scroll == GTK_SCROLL_PAGE_BACKWARD) {
 756                 ev_view_set_page (view, ev_view_get_page (view) - 1);
 757         } else if (scroll == GTK_SCROLL_PAGE_FORWARD) {
 758                 ev_view_set_page (view, ev_view_get_page (view) + 1);
 759         } else {
 760                 GtkAdjustment *adjustment;
 761                 double value;
 762
 763                 if (horizontal) {
 764                         adjustment = view->hadjustment;
 765                 } else {
 766                         adjustment = view->vadjustment;
 767                 }
 768
 769                 value = adjustment->value;
 770
 771                 switch (scroll) {
 772                         case GTK_SCROLL_STEP_BACKWARD:
 773                                 value -= adjustment->step_increment;
 774                                 break;
 775                         case GTK_SCROLL_STEP_FORWARD:
 776                                 value += adjustment->step_increment;
 777                                 break;
 778                         default:
 779                                 break;
 780                 }
 781
 782                 value = CLAMP (value, adjustment->lower,
 783                                adjustment->upper - adjustment->page_size);
 784
 785                 gtk_adjustment_set_value (adjustment, value);
 786         }
 787 }
 788
 789 static void
 790 ev_view_set_property (GObject *object,
 791                       guint prop_id,
 792                       const GValue *value,
 793                       GParamSpec *pspec)
 794 {
 795         switch (prop_id)
 796         {
 797                 /* Read only */
 798                 case PROP_STATUS:
 799                 case PROP_FIND_STATUS:
 800                         break;
 801         }
 802 }
 803
 804 static void
 805 ev_view_get_property (GObject *object,
 806                       guint prop_id,
 807                       GValue *value,
 808                       GParamSpec *pspec)
 809 {
 810         EvView *view = EV_VIEW (object);
 811
 812         switch (prop_id)
 813         {
 814                 case PROP_STATUS:
 815                         g_value_set_string (value, view->status);
 816                         break;
 817                 case PROP_FIND_STATUS:
 818                         g_value_set_string (value, view->status);
 819                         break;
 820         }
 821 }
 822
 823 static void
 824 ev_view_class_init (EvViewClass *class)
 825 {
 826         GObjectClass *object_class = G_OBJECT_CLASS (class);
 827         GtkObjectClass *gtk_object_class = GTK_OBJECT_CLASS (class);
 828         GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
 829         GtkBindingSet *binding_set;
 830
 831         object_class->finalize = ev_view_finalize;
 832         object_class->set_property = ev_view_set_property;
 833         object_class->get_property = ev_view_get_property;
 834
 835         widget_class->expose_event = ev_view_expose_event;
 836         widget_class->button_press_event = ev_view_button_press_event;
 837         widget_class->motion_notify_event = ev_view_motion_notify_event;
 838         widget_class->button_release_event = ev_view_button_release_event;
 839         widget_class->size_request = ev_view_size_request;
 840         widget_class->size_allocate = ev_view_size_allocate;
 841         widget_class->realize = ev_view_realize;
 842         widget_class->unrealize = ev_view_unrealize;
 843         gtk_object_class->destroy = ev_view_destroy;
 844
 845         class->set_scroll_adjustments = ev_view_set_scroll_adjustments;
 846         class->scroll_view = ev_view_scroll_view;
 847
 848         widget_class->set_scroll_adjustments_signal =  g_signal_new ("set-scroll-adjustments",
 849                                                                      G_OBJECT_CLASS_TYPE (object_class),
 850                                                                      G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 851                                                                      G_STRUCT_OFFSET (EvViewClass, set_scroll_adjustments),
 852                                                                      NULL, NULL,
 853                                                                      ev_marshal_VOID__OBJECT_OBJECT,
 854                                                                      G_TYPE_NONE, 2,
 855                                                                      GTK_TYPE_ADJUSTMENT,
 856                                                                      GTK_TYPE_ADJUSTMENT);
 857         page_changed_signal = g_signal_new ("page-changed",
 858                                             G_OBJECT_CLASS_TYPE (object_class),
 859                                             G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 860                                             G_STRUCT_OFFSET (EvViewClass, page_changed),
 861                                             NULL, NULL,
 862                                             ev_marshal_VOID__NONE,
 863                                             G_TYPE_NONE, 0);
 864
 865         g_signal_new ("scroll_view",
 866                       G_TYPE_FROM_CLASS (object_class),
 867                       G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 868                       G_STRUCT_OFFSET (EvViewClass, scroll_view),
 869                       NULL, NULL,
 870                       ev_marshal_VOID__ENUM_BOOLEAN,
 871                       G_TYPE_NONE, 2,
 872                       GTK_TYPE_SCROLL_TYPE,
 873                       G_TYPE_BOOLEAN);
 874
 875         g_object_class_install_property (object_class,
 876                                          PROP_STATUS,
 877                                          g_param_spec_string ("status",
 878                                                               "Status Message",
 879                                                               "The status message",
 880                                                               NULL,
 881                                                               G_PARAM_READABLE));
 882
 883         g_object_class_install_property (object_class,
 884                                          PROP_STATUS,
 885                                          g_param_spec_string ("find-status",
 886                                                               "Find Status Message",
 887                                                               "The find status message",
 888                                                               NULL,
 889                                                               G_PARAM_READABLE));
 890
 891         binding_set = gtk_binding_set_by_class (class);
 892
 893         add_scroll_binding (binding_set, GDK_Left,  GTK_SCROLL_STEP_BACKWARD, TRUE);
 894         add_scroll_binding (binding_set, GDK_Right, GTK_SCROLL_STEP_FORWARD,  TRUE);
 895         add_scroll_binding (binding_set, GDK_Up,    GTK_SCROLL_STEP_BACKWARD, FALSE);
 896         add_scroll_binding (binding_set, GDK_Down,  GTK_SCROLL_STEP_FORWARD,  FALSE);
 897
 898         add_scroll_binding (binding_set, GDK_Page_Up,   GTK_SCROLL_PAGE_BACKWARD, FALSE);
 899         add_scroll_binding (binding_set, GDK_Page_Down, GTK_SCROLL_PAGE_FORWARD,  FALSE);
 900 }
 901
 902 static void
 903 ev_view_init (EvView *view)
 904 {
 905         GTK_WIDGET_SET_FLAGS (view, GTK_CAN_FOCUS);
 906
 907         view->scale = 1.0;
 908         view->pressed_button = -1;
 909         view->cursor = EV_VIEW_CURSOR_NORMAL;
 910 }
 911
 912 static char *
 913 ev_view_get_find_status_message (EvView *view)
 914 {
 915 /*
 916         if (view->find_results->len == 0) {
 917                 if (view->find_percent_complete >= (1.0 - 1e-10)) {
 918                         return g_strdup (_("Not found"));
 919                 } else {
 920                         return g_strdup_printf (_("%3d%% remaining to search"),
 921                                                 (int) ((1.0 - view->find_percent_complete) * 100));
 922                 }
 923         } else if (view->results_on_this_page == 0) {
 924                 g_assert (view->next_page_with_result != 0);
 925                 return g_strdup_printf (_("Found on page %d"),
 926                                         view->next_page_with_result);
 927         } else {
 928                 return g_strdup_printf (_("%d found on this page"),
 929                                         view->results_on_this_page);
 930         }
 931 */
 932 }
 933
 934 static void
 935 set_document_page (EvView *view, int page)
 936 {
 937         if (view->document) {
 938                 int old_page = ev_document_get_page (view->document);
 939                 int old_width, old_height;
 940
 941                 ev_document_get_page_size (view->document,
 942                                            &old_width, &old_height);
 943
 944                 if (old_page != page) {
 945                         ev_view_set_cursor (view, EV_VIEW_CURSOR_WAIT);
 946                         ev_document_set_page (view->document, page);
 947                 }
 948
 949                 if (old_page != ev_document_get_page (view->document)) {
 950                         int width, height;
 951
 952                         g_signal_emit (view, page_changed_signal, 0);
 953
 954                         view->has_selection = FALSE;
 955                         ev_document_get_page_size (view->document,
 956                                                    &width, &height);
 957                         if (width != old_width || height != old_height)
 958                                 gtk_widget_queue_resize (GTK_WIDGET (view));
 959                 }
 960
 961                 view->find_page = page;
 962                 view->find_result = 0;
 963         }
 964 }
 965
 966 #define MARGIN 5
 967
 968 static void
 969 ensure_rectangle_is_visible (EvView *view, GdkRectangle *rect)
 970 {
 971         GtkWidget *widget = GTK_WIDGET (view);
 972         GtkAdjustment *adjustment;
 973         int value;
 974
 975         adjustment = view->vadjustment;
 976
 977         if (rect->y < adjustment->value) {
 978                 value = MAX (adjustment->lower, rect->y - MARGIN);
 979                 gtk_adjustment_set_value (view->vadjustment, value);
 980         } else if (rect->y + rect->height >
 981                    adjustment->value + widget->allocation.height) {
 982                 value = MIN (adjustment->upper, rect->y + rect->height -
 983                              widget->allocation.height + MARGIN);
 984                 gtk_adjustment_set_value (view->vadjustment, value);
 985         }
 986
 987         adjustment = view->hadjustment;
 988
 989         if (rect->x < adjustment->value) {
 990                 value = MAX (adjustment->lower, rect->x - MARGIN);
 991                 gtk_adjustment_set_value (view->hadjustment, value);
 992         } else if (rect->x + rect->height >
 993                    adjustment->value + widget->allocation.width) {
 994                 value = MIN (adjustment->upper, rect->x + rect->width -
 995                              widget->allocation.width + MARGIN);
 996                 gtk_adjustment_set_value (view->hadjustment, value);
 997         }
 998 }
 999
1000 static void
1001 jump_to_find_result (EvView *view)
1002 {
1003         GdkRectangle rect;
1004
1005         ev_document_find_get_result (EV_DOCUMENT_FIND (view->document),
1006                                      view->find_result, &rect);
1007         ensure_rectangle_is_visible (view, &rect);
1008 }
1009
1010 static void
1011 jump_to_find_page (EvView *view)
1012 {
1013         int n_pages, i;
1014
1015         n_pages = ev_document_get_n_pages (view->document);
1016
1017         for (i = 0; i <= n_pages; i++) {
1018                 int has_results;
1019                 int page;
1020
1021                 page = i + view->find_page;
1022                 if (page > n_pages) {
1023                         page = page - n_pages;
1024                 }
1025
1026                 has_results = ev_document_find_page_has_results
1027                                 (EV_DOCUMENT_FIND (view->document), page);
1028                 if (has_results == -1) {
1029                         view->find_page = page;
1030                         break;
1031                 } else if (has_results == 1) {
1032                         set_document_page (view, page);
1033                         jump_to_find_result (view);
1034                         break;
1035                 }
1036         }
1037 }
1038
1039 static void
1040 find_changed_cb (EvDocument *document, int page, EvView *view)
1041 {
1042         jump_to_find_page (view);
1043         jump_to_find_result (view);
1044
1045         g_print ("Update for page %d\n", page);
1046
1047         if (ev_document_get_page (document) == page) {
1048                 gtk_widget_queue_draw (GTK_WIDGET (view));
1049         }
1050 }
1051
1052 static void
1053 document_changed_callback (EvDocument *document,
1054                            EvView     *view)
1055 {
1056         gtk_widget_queue_draw (GTK_WIDGET (view));
1057         ev_view_set_cursor (view, EV_VIEW_CURSOR_NORMAL);
1058 }
1059
1060 /*** Public API ***/
1061
1062 GtkWidget*
1063 ev_view_new (void)
1064 {
1065         return g_object_new (EV_TYPE_VIEW, NULL);
1066 }
1067
1068 void
1069 ev_view_set_document (EvView     *view,
1070                       EvDocument *document)
1071 {
1072         g_return_if_fail (EV_IS_VIEW (view));
1073
1074         if (document != view->document) {
1075                 if (view->document) {
1076                         g_signal_handlers_disconnect_by_func (view->document,
1077                                                               find_changed_cb,
1078                                                               view);
1079                         g_object_unref (view->document);
1080                 }
1081
1082                 view->document = document;
1083                 view->find_page = 1;
1084                 view->find_result = 0;
1085
1086                 if (view->document) {
1087                         g_object_ref (view->document);
1088                         if (EV_IS_DOCUMENT_FIND (view->document))
1089                                 g_signal_connect (view->document,
1090                                                   "find_changed",
1091                                                   G_CALLBACK (find_changed_cb),
1092                                                   view);
1093                         g_signal_connect (view->document,
1094                                           "changed",
1095                                           G_CALLBACK (document_changed_callback),
1096                                           view);
1097                 }
1098
1099                 if (GTK_WIDGET_REALIZED (view))
1100                         ev_document_set_target (view->document, view->bin_window);
1101
1102                 gtk_widget_queue_resize (GTK_WIDGET (view));
1103
1104                 g_signal_emit (view, page_changed_signal, 0);
1105         }
1106 }
1107
1108 static void
1109 go_to_link (EvView *view, EvLink *link)
1110 {
1111         EvLinkType type;
1112         const char *uri;
1113         int page;
1114
1115         type = ev_link_get_link_type (link);
1116
1117         switch (type) {
1118                 case EV_LINK_TYPE_TITLE:
1119                         break;
1120                 case EV_LINK_TYPE_PAGE:
1121                         page = ev_link_get_page (link);
1122                         set_document_page (view, page);
1123                         break;
1124                 case EV_LINK_TYPE_EXTERNAL_URI:
1125                         uri = ev_link_get_uri (link);
1126                         gnome_vfs_url_show (uri);
1127                         break;
1128         }
1129 }
1130
1131 void
1132 ev_view_go_to_link (EvView *view, EvLink *link)
1133 {
1134         go_to_link (view, link);
1135 }
1136
1137 void
1138 ev_view_set_page (EvView *view,
1139                   int     page)
1140 {
1141         g_return_if_fail (EV_IS_VIEW (view));
1142
1143         set_document_page (view, page);
1144 }
1145
1146 int
1147 ev_view_get_page (EvView *view)
1148 {
1149         if (view->document)
1150                 return ev_document_get_page (view->document);
1151         else
1152                 return 1;
1153 }
1154
1155 #define ZOOM_IN_FACTOR  1.2
1156 #define ZOOM_OUT_FACTOR (1.0/ZOOM_IN_FACTOR)
1157
1158 #define MIN_SCALE 0.05409
1159 #define MAX_SCALE 18.4884
1160
1161 static void
1162 ev_view_zoom (EvView   *view,
1163               double    factor,
1164               gboolean  relative)
1165 {
1166         double scale;
1167
1168         if (relative)
1169                 scale = view->scale * factor;
1170         else
1171                 scale = factor;
1172
1173         view->scale = CLAMP (scale, MIN_SCALE, MAX_SCALE);
1174
1175         ev_document_set_scale (view->document, view->scale);
1176
1177         gtk_widget_queue_resize (GTK_WIDGET (view));
1178 }
1179
1180 void
1181 ev_view_zoom_in (EvView *view)
1182 {
1183         ev_view_zoom (view, ZOOM_IN_FACTOR, TRUE);
1184 }
1185
1186 void
1187 ev_view_zoom_out (EvView *view)
1188 {
1189         ev_view_zoom (view, ZOOM_OUT_FACTOR, TRUE);
1190 }
1191
1192 void
1193 ev_view_normal_size (EvView *view)
1194 {
1195         ev_view_zoom (view, 1.0, FALSE);
1196 }
1197
1198 void
1199 ev_view_best_fit (EvView *view)
1200 {
1201         double scale;
1202         int width, height;
1203
1204         width = height = 0;
1205         ev_document_get_page_size (view->document, &width, &height);
1206
1207         scale = 1.0;
1208         if (width != 0 && height != 0) {
1209                 double scale_w, scale_h;
1210
1211                 scale_w = (double)GTK_WIDGET (view)->allocation.width * view->scale / width;
1212                 scale_h = (double)GTK_WIDGET (view)->allocation.height * view->scale / height;
1213
1214                 scale = (scale_w < scale_h) ? scale_w : scale_h;
1215         }
1216
1217         ev_view_zoom (view, scale, FALSE);
1218 }
1219
1220 void
1221 ev_view_fit_width (EvView *view)
1222 {
1223         double scale = 1.0;
1224         int width;
1225
1226         width = 0;
1227         ev_document_get_page_size (view->document, &width, NULL);
1228
1229         scale = 1.0;
1230         if (width != 0)
1231                 scale = (double)GTK_WIDGET (view)->allocation.width * view->scale / width;
1232
1233         ev_view_zoom (view, scale, FALSE);
1234 }
1235
1236 const char *
1237 ev_view_get_status (EvView *view)
1238 {
1239         g_return_val_if_fail (EV_IS_VIEW (view), NULL);
1240
1241         return view->status;
1242 }
1243
1244 const char *
1245 ev_view_get_find_status (EvView *view)
1246 {
1247         g_return_val_if_fail (EV_IS_VIEW (view), NULL);
1248
1249         return view->find_status;
1250 }
1251
1252 void
1253 ev_view_find_next (EvView *view)
1254 {
1255         int n_results, n_pages;
1256         EvDocumentFind *find = EV_DOCUMENT_FIND (view->document);
1257
1258         n_results = ev_document_find_get_n_results (find);
1259         n_pages = ev_document_get_n_pages (view->document);
1260
1261         view->find_result++;
1262
1263         if (view->find_result >= n_results) {
1264                 view->find_result = 0;
1265                 view->find_page++;
1266
1267                 if (view->find_page > n_pages) {
1268                         view->find_page = 1;
1269                 }
1270
1271                 jump_to_find_page (view);
1272         } else {
1273                 jump_to_find_result (view);
1274                 gtk_widget_queue_draw (GTK_WIDGET (view));
1275         }
1276 }
1277
1278 void
1279 ev_view_find_previous (EvView *view)
1280 {
1281         int n_results, n_pages;
1282         EvDocumentFind *find = EV_DOCUMENT_FIND (view->document);
1283
1284         n_results = ev_document_find_get_n_results (find);
1285         n_pages = ev_document_get_n_pages (view->document);
1286
1287         view->find_result--;
1288
1289         if (view->find_result < 0) {
1290                 view->find_result = 0;
1291                 view->find_page--;
1292
1293                 if (view->find_page < 1) {
1294                         view->find_page = n_pages;
1295                 }
1296
1297                 jump_to_find_page (view);
1298         } else {
1299                 jump_to_find_result (view);
1300                 gtk_widget_queue_draw (GTK_WIDGET (view));
1301         }
1302 }