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, guchar alpha)
 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 | alpha;
 340
 341         pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8,
 342                                  rect->width, rect->height);
 343         gdk_pixbuf_fill (pixbuf, fill_color);
 344
 345         gdk_draw_pixbuf (window, NULL, pixbuf,
 346                          0, 0,
 347                          rect->x,rect->y,
 348                          rect->width, rect->height,
 349                          GDK_RGB_DITHER_NONE,
 350                          0, 0);
 351
 352         g_object_unref (pixbuf);
 353
 354         gc = gdk_gc_new (window);
 355         gdk_gc_set_rgb_fg_color (gc, fill_color_gdk);
 356         gdk_draw_rectangle (window, gc, FALSE,
 357                             rect->x, rect->y,
 358                             rect->width - 1,
 359                             rect->height - 1);
 360         g_object_unref (gc);
 361
 362         gdk_color_free (fill_color_gdk);
 363 }
 364
 365 static void
 366 highlight_find_results (EvView *view)
 367 {
 368         EvDocumentFind *find = EV_DOCUMENT_FIND (view->document);
 369         int i, results;
 370
 371         results = ev_document_find_get_n_results (find);
 372
 373         for (i = 0; i < results; i++) {
 374                 GdkRectangle rectangle;
 375                 guchar alpha;
 376
 377                 alpha = (i == view->find_result) ? 0x90 : 0x20;
 378                 ev_document_find_get_result (find, i, &rectangle);
 379                 draw_rubberband (GTK_WIDGET (view), view->bin_window,
 380                                  &rectangle, alpha);
 381         }
 382 }
 383
 384 static void
 385 expose_bin_window (GtkWidget      *widget,
 386                    GdkEventExpose *event)
 387 {
 388         EvView *view = EV_VIEW (widget);
 389         int x_offset, y_offset;
 390
 391         if (view->document == NULL)
 392                 return;
 393
 394         x_offset = MAX (0, (widget->allocation.width -
 395                             widget->requisition.width) / 2);
 396         y_offset = MAX (0, (widget->allocation.height -
 397                             widget->requisition.height) / 2);
 398         gdk_draw_rectangle (view->bin_window,
 399                             widget->style->black_gc,
 400                             FALSE,
 401                             x_offset,
 402                             y_offset,
 403                             widget->requisition.width - 1,
 404                             widget->requisition.height - 1);
 405
 406         ev_document_set_page_offset (view->document,
 407                                      x_offset + 1,
 408                                      y_offset + 1);
 409
 410         ev_document_render (view->document,
 411                             event->area.x, event->area.y,
 412                             event->area.width, event->area.height);
 413
 414         highlight_find_results (view);
 415
 416         if (view->has_selection) {
 417                 draw_rubberband (widget, view->bin_window,
 418                                  &view->selection, 0x40);
 419         }
 420 }
 421
 422 static gboolean
 423 ev_view_expose_event (GtkWidget      *widget,
 424                       GdkEventExpose *event)
 425 {
 426         EvView *view = EV_VIEW (widget);
 427
 428         if (event->window == view->bin_window)
 429                 expose_bin_window (widget, event);
 430         else
 431                 return GTK_WIDGET_CLASS (ev_view_parent_class)->expose_event (widget, event);
 432
 433         return FALSE;
 434 }
 435
 436 void
 437 ev_view_select_all (EvView *ev_view)
 438 {
 439         GtkWidget *widget = GTK_WIDGET (ev_view);
 440
 441         g_return_if_fail (EV_IS_VIEW (ev_view));
 442
 443         ev_view->has_selection = TRUE;
 444         ev_view->selection.x = ev_view->selection.y = 0;
 445         ev_view->selection.width = widget->requisition.width;
 446         ev_view->selection.height = widget->requisition.height;
 447
 448         gtk_widget_queue_draw (widget);
 449 }
 450
 451 void
 452 ev_view_copy (EvView *ev_view)
 453 {
 454         GtkClipboard *clipboard;
 455         char *text;
 456
 457         text = ev_document_get_text (ev_view->document, &ev_view->selection);
 458         clipboard = gtk_widget_get_clipboard (GTK_WIDGET (ev_view),
 459                                               GDK_SELECTION_CLIPBOARD);
 460         gtk_clipboard_set_text (clipboard, text, -1);
 461         g_free (text);
 462 }
 463
 464 static void
 465 ev_view_primary_get_cb (GtkClipboard     *clipboard,
 466                         GtkSelectionData *selection_data,
 467                         guint             info,
 468                         gpointer          data)
 469 {
 470         EvView *ev_view = EV_VIEW (data);
 471         char *text;
 472
 473         text = ev_document_get_text (ev_view->document, &ev_view->selection);
 474         gtk_selection_data_set_text (selection_data, text, -1);
 475 }
 476
 477 static void
 478 ev_view_primary_clear_cb (GtkClipboard *clipboard,
 479                           gpointer      data)
 480 {
 481         EvView *ev_view = EV_VIEW (data);
 482
 483         ev_view->has_selection = FALSE;
 484 }
 485
 486 static void
 487 ev_view_update_primary_selection (EvView *ev_view)
 488 {
 489         GtkClipboard *clipboard;
 490
 491         clipboard = gtk_widget_get_clipboard (GTK_WIDGET (ev_view),
 492                                               GDK_SELECTION_PRIMARY);
 493
 494         if (ev_view->has_selection) {
 495                 if (!gtk_clipboard_set_with_owner (clipboard,
 496                                                    targets,
 497                                                    G_N_ELEMENTS (targets),
 498                                                    ev_view_primary_get_cb,
 499                                                    ev_view_primary_clear_cb,
 500                                                    G_OBJECT (ev_view)))
 501                         ev_view_primary_clear_cb (clipboard, ev_view);
 502         } else {
 503                 if (gtk_clipboard_get_owner (clipboard) == G_OBJECT (ev_view))
 504                         gtk_clipboard_clear (clipboard);
 505         }
 506 }
 507
 508 static gboolean
 509 ev_view_button_press_event (GtkWidget      *widget,
 510                             GdkEventButton *event)
 511 {
 512         EvView *view = EV_VIEW (widget);
 513
 514         if (!GTK_WIDGET_HAS_FOCUS (widget)) {
 515                 gtk_widget_grab_focus (widget);
 516         }
 517
 518         view->pressed_button = event->button;
 519
 520         switch (event->button) {
 521                 case 1:
 522                         if (view->has_selection) {
 523                                 view->has_selection = FALSE;
 524                                 gtk_widget_queue_draw (widget);
 525                         }
 526
 527                         view->selection_start.x = event->x;
 528                         view->selection_start.y = event->y;
 529                         break;
 530         }
 531
 532         return TRUE;
 533 }
 534
 535 static char *
 536 status_message_from_link (EvLink *link)
 537 {
 538         EvLinkType type;
 539         char *msg;
 540         int page;
 541
 542         type = ev_link_get_link_type (link);
 543
 544         switch (type) {
 545                 case EV_LINK_TYPE_TITLE:
 546                         msg = g_strdup (ev_link_get_title (link));
 547                         break;
 548                 case EV_LINK_TYPE_PAGE:
 549                         page = ev_link_get_page (link);
 550                         msg = g_strdup_printf (_("Go to page %d"), page);
 551                         break;
 552                 case EV_LINK_TYPE_EXTERNAL_URI:
 553                         msg = g_strdup (ev_link_get_uri (link));
 554                         break;
 555                 default:
 556                         msg = NULL;
 557         }
 558
 559         return msg;
 560 }
 561
 562 static void
 563 ev_view_set_status (EvView *view, const char *message)
 564 {
 565         g_return_if_fail (EV_IS_VIEW (view));
 566
 567         if (message != view->status) {
 568                 g_free (view->status);
 569                 view->status = g_strdup (message);
 570                 g_object_notify (G_OBJECT (view), "status");
 571         }
 572 }
 573
 574 static void
 575 ev_view_set_find_status (EvView *view, const char *message)
 576 {
 577         g_return_if_fail (EV_IS_VIEW (view));
 578
 579         g_free (view->find_status);
 580         view->find_status = g_strdup (message);
 581         g_object_notify (G_OBJECT (view), "find-status");
 582 }
 583
 584
 585 static void
 586 ev_view_set_cursor (EvView *view, EvViewCursor new_cursor)
 587 {
 588         GdkCursor *cursor = NULL;
 589         GdkDisplay *display;
 590         GtkWidget *widget;
 591
 592         if (view->cursor == new_cursor) {
 593                 return;
 594         }
 595
 596         widget = gtk_widget_get_toplevel (GTK_WIDGET (view));
 597         display = gtk_widget_get_display (widget);
 598         view->cursor = new_cursor;
 599
 600         switch (new_cursor) {
 601                 case EV_VIEW_CURSOR_NORMAL:
 602                         gdk_window_set_cursor (widget->window, NULL);
 603                         break;
 604                 case EV_VIEW_CURSOR_LINK:
 605                         cursor = gdk_cursor_new_for_display (display, GDK_HAND2);
 606                         break;
 607                 case EV_VIEW_CURSOR_WAIT:
 608                         cursor = gdk_cursor_new_for_display (display, GDK_WATCH);
 609                         break;
 610         }
 611
 612         if (cursor) {
 613                 gdk_window_set_cursor (widget->window, cursor);
 614                 gdk_cursor_unref (cursor);
 615                 gdk_flush();
 616         }
 617 }
 618
 619 static gboolean
 620 ev_view_motion_notify_event (GtkWidget      *widget,
 621                              GdkEventMotion *event)
 622 {
 623         EvView *view = EV_VIEW (widget);
 624
 625         if (view->pressed_button > 0) {
 626                 view->has_selection = TRUE;
 627                 view->selection.x = MIN (view->selection_start.x, event->x);
 628                 view->selection.y = MIN (view->selection_start.y, event->y);
 629                 view->selection.width = ABS (view->selection_start.x - event->x) + 1;
 630                 view->selection.height = ABS (view->selection_start.y - event->y) + 1;
 631
 632                 gtk_widget_queue_draw (widget);
 633         } else if (view->document) {
 634                 EvLink *link;
 635
 636                 link = ev_document_get_link (view->document, event->x, event->y);
 637                 if (link) {
 638                         char *msg;
 639
 640                         msg = status_message_from_link (link);
 641                         ev_view_set_status (view, msg);
 642                         ev_view_set_cursor (view, EV_VIEW_CURSOR_LINK);
 643                         g_free (msg);
 644
 645                         g_object_unref (link);
 646                 } else {
 647                         ev_view_set_status (view, NULL);
 648                         if (view->cursor == EV_VIEW_CURSOR_LINK) {
 649                                 ev_view_set_cursor (view, EV_VIEW_CURSOR_NORMAL);
 650                         }
 651                 }
 652         }
 653
 654         return TRUE;
 655 }
 656
 657 static gboolean
 658 ev_view_button_release_event (GtkWidget      *widget,
 659                               GdkEventButton *event)
 660 {
 661         EvView *view = EV_VIEW (widget);
 662
 663         view->pressed_button = -1;
 664
 665         if (view->has_selection) {
 666                 ev_view_update_primary_selection (view);
 667         } else if (view->document) {
 668                 EvLink *link;
 669
 670                 link = ev_document_get_link (view->document,
 671                                              event->x,
 672                                              event->y);
 673                 if (link) {
 674                         ev_view_go_to_link (view, link);
 675                         g_object_unref (link);
 676                 }
 677         }
 678
 679         return FALSE;
 680 }
 681
 682 static void
 683 on_adjustment_value_changed (GtkAdjustment  *adjustment,
 684                              EvView *view)
 685 {
 686         view_update_adjustments (view);
 687 }
 688
 689 static void
 690 set_scroll_adjustment (EvView *view,
 691                        GtkOrientation  orientation,
 692                        GtkAdjustment  *adjustment)
 693 {
 694         GtkAdjustment **to_set;
 695
 696         if (orientation == GTK_ORIENTATION_HORIZONTAL)
 697                 to_set = &view->hadjustment;
 698         else
 699                 to_set = &view->vadjustment;
 700
 701         if (*to_set != adjustment) {
 702                 if (*to_set) {
 703                         g_signal_handlers_disconnect_by_func (*to_set,
 704                                                               (gpointer) on_adjustment_value_changed,
 705                                                               view);
 706                         g_object_unref (*to_set);
 707                 }
 708
 709                 *to_set = adjustment;
 710                 view_set_adjustment_values (view, orientation);
 711
 712                 if (*to_set) {
 713                         g_object_ref (*to_set);
 714                         g_signal_connect (*to_set, "value_changed",
 715                                           G_CALLBACK (on_adjustment_value_changed), view);
 716                 }
 717         }
 718 }
 719
 720 static void
 721 ev_view_set_scroll_adjustments (EvView *view,
 722                                 GtkAdjustment  *hadjustment,
 723                                 GtkAdjustment  *vadjustment)
 724 {
 725         set_scroll_adjustment (view, GTK_ORIENTATION_HORIZONTAL, hadjustment);
 726         set_scroll_adjustment (view, GTK_ORIENTATION_VERTICAL, vadjustment);
 727
 728         view_update_adjustments (view);
 729 }
 730
 731 static void
 732 add_scroll_binding (GtkBindingSet  *binding_set,
 733                     guint           keyval,
 734                     GtkScrollType   scroll,
 735                     gboolean        horizontal)
 736 {
 737   guint keypad_keyval = keyval - GDK_Left + GDK_KP_Left;
 738
 739   gtk_binding_entry_add_signal (binding_set, keyval, 0,
 740                                 "scroll_view", 2,
 741                                 GTK_TYPE_SCROLL_TYPE, scroll,
 742                                 G_TYPE_BOOLEAN, horizontal);
 743   gtk_binding_entry_add_signal (binding_set, keypad_keyval, 0,
 744                                 "scroll_view", 2,
 745                                 GTK_TYPE_SCROLL_TYPE, scroll,
 746                                 G_TYPE_BOOLEAN, horizontal);
 747 }
 748
 749 static void
 750 ev_view_scroll_view (EvView *view,
 751                      GtkScrollType scroll,
 752                      gboolean horizontal)
 753 {
 754         if (scroll == GTK_SCROLL_PAGE_BACKWARD) {
 755                 ev_view_set_page (view, ev_view_get_page (view) - 1);
 756         } else if (scroll == GTK_SCROLL_PAGE_FORWARD) {
 757                 ev_view_set_page (view, ev_view_get_page (view) + 1);
 758         } else {
 759                 GtkAdjustment *adjustment;
 760                 double value;
 761
 762                 if (horizontal) {
 763                         adjustment = view->hadjustment;
 764                 } else {
 765                         adjustment = view->vadjustment;
 766                 }
 767
 768                 value = adjustment->value;
 769
 770                 switch (scroll) {
 771                         case GTK_SCROLL_STEP_BACKWARD:
 772                                 value -= adjustment->step_increment;
 773                                 break;
 774                         case GTK_SCROLL_STEP_FORWARD:
 775                                 value += adjustment->step_increment;
 776                                 break;
 777                         default:
 778                                 break;
 779                 }
 780
 781                 value = CLAMP (value, adjustment->lower,
 782                                adjustment->upper - adjustment->page_size);
 783
 784                 gtk_adjustment_set_value (adjustment, value);
 785         }
 786 }
 787
 788 static void
 789 ev_view_set_property (GObject *object,
 790                       guint prop_id,
 791                       const GValue *value,
 792                       GParamSpec *pspec)
 793 {
 794         switch (prop_id)
 795         {
 796                 /* Read only */
 797                 case PROP_STATUS:
 798                 case PROP_FIND_STATUS:
 799                         break;
 800         }
 801 }
 802
 803 static void
 804 ev_view_get_property (GObject *object,
 805                       guint prop_id,
 806                       GValue *value,
 807                       GParamSpec *pspec)
 808 {
 809         EvView *view = EV_VIEW (object);
 810
 811         switch (prop_id)
 812         {
 813                 case PROP_STATUS:
 814                         g_value_set_string (value, view->status);
 815                         break;
 816                 case PROP_FIND_STATUS:
 817                         g_value_set_string (value, view->status);
 818                         break;
 819         }
 820 }
 821
 822 static void
 823 ev_view_class_init (EvViewClass *class)
 824 {
 825         GObjectClass *object_class = G_OBJECT_CLASS (class);
 826         GtkObjectClass *gtk_object_class = GTK_OBJECT_CLASS (class);
 827         GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
 828         GtkBindingSet *binding_set;
 829
 830         object_class->finalize = ev_view_finalize;
 831         object_class->set_property = ev_view_set_property;
 832         object_class->get_property = ev_view_get_property;
 833
 834         widget_class->expose_event = ev_view_expose_event;
 835         widget_class->button_press_event = ev_view_button_press_event;
 836         widget_class->motion_notify_event = ev_view_motion_notify_event;
 837         widget_class->button_release_event = ev_view_button_release_event;
 838         widget_class->size_request = ev_view_size_request;
 839         widget_class->size_allocate = ev_view_size_allocate;
 840         widget_class->realize = ev_view_realize;
 841         widget_class->unrealize = ev_view_unrealize;
 842         gtk_object_class->destroy = ev_view_destroy;
 843
 844         class->set_scroll_adjustments = ev_view_set_scroll_adjustments;
 845         class->scroll_view = ev_view_scroll_view;
 846
 847         widget_class->set_scroll_adjustments_signal =  g_signal_new ("set-scroll-adjustments",
 848                                                                      G_OBJECT_CLASS_TYPE (object_class),
 849                                                                      G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 850                                                                      G_STRUCT_OFFSET (EvViewClass, set_scroll_adjustments),
 851                                                                      NULL, NULL,
 852                                                                      ev_marshal_VOID__OBJECT_OBJECT,
 853                                                                      G_TYPE_NONE, 2,
 854                                                                      GTK_TYPE_ADJUSTMENT,
 855                                                                      GTK_TYPE_ADJUSTMENT);
 856         page_changed_signal = g_signal_new ("page-changed",
 857                                             G_OBJECT_CLASS_TYPE (object_class),
 858                                             G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 859                                             G_STRUCT_OFFSET (EvViewClass, page_changed),
 860                                             NULL, NULL,
 861                                             ev_marshal_VOID__NONE,
 862                                             G_TYPE_NONE, 0);
 863
 864         g_signal_new ("scroll_view",
 865                       G_TYPE_FROM_CLASS (object_class),
 866                       G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 867                       G_STRUCT_OFFSET (EvViewClass, scroll_view),
 868                       NULL, NULL,
 869                       ev_marshal_VOID__ENUM_BOOLEAN,
 870                       G_TYPE_NONE, 2,
 871                       GTK_TYPE_SCROLL_TYPE,
 872                       G_TYPE_BOOLEAN);
 873
 874         g_object_class_install_property (object_class,
 875                                          PROP_STATUS,
 876                                          g_param_spec_string ("status",
 877                                                               "Status Message",
 878                                                               "The status message",
 879                                                               NULL,
 880                                                               G_PARAM_READABLE));
 881
 882         g_object_class_install_property (object_class,
 883                                          PROP_STATUS,
 884                                          g_param_spec_string ("find-status",
 885                                                               "Find Status Message",
 886                                                               "The find status message",
 887                                                               NULL,
 888                                                               G_PARAM_READABLE));
 889
 890         binding_set = gtk_binding_set_by_class (class);
 891
 892         add_scroll_binding (binding_set, GDK_Left,  GTK_SCROLL_STEP_BACKWARD, TRUE);
 893         add_scroll_binding (binding_set, GDK_Right, GTK_SCROLL_STEP_FORWARD,  TRUE);
 894         add_scroll_binding (binding_set, GDK_Up,    GTK_SCROLL_STEP_BACKWARD, FALSE);
 895         add_scroll_binding (binding_set, GDK_Down,  GTK_SCROLL_STEP_FORWARD,  FALSE);
 896
 897         add_scroll_binding (binding_set, GDK_Page_Up,   GTK_SCROLL_PAGE_BACKWARD, FALSE);
 898         add_scroll_binding (binding_set, GDK_Page_Down, GTK_SCROLL_PAGE_FORWARD,  FALSE);
 899 }
 900
 901 static void
 902 ev_view_init (EvView *view)
 903 {
 904         GTK_WIDGET_SET_FLAGS (view, GTK_CAN_FOCUS);
 905
 906         view->scale = 1.0;
 907         view->pressed_button = -1;
 908         view->cursor = EV_VIEW_CURSOR_NORMAL;
 909 }
 910
 911 static void
 912 update_find_status_message (EvView *view)
 913 {
 914         char *message;
 915
 916         if (ev_document_get_page (view->document) == view->find_page) {
 917                 int results;
 918
 919                 results = ev_document_find_get_n_results
 920                                 (EV_DOCUMENT_FIND (view->document));
 921
 922                 message = g_strdup_printf (_("%d found on this page"),
 923                                            results);
 924         } else {
 925                 double percent;
 926
 927                 percent = ev_document_find_get_progress
 928                                 (EV_DOCUMENT_FIND (view->document));
 929
 930                 if (percent >= (1.0 - 1e-10)) {
 931                         message = g_strdup (_("Not found"));
 932                 } else {
 933                         message = g_strdup_printf (_("%3d%% remaining to search"),
 934                                                    (int) ((1.0 - percent) * 100));
 935                 }
 936
 937         }
 938
 939         ev_view_set_find_status (view, message);
 940         g_free (message);
 941 }
 942
 943 static void
 944 set_document_page (EvView *view, int page)
 945 {
 946         if (view->document) {
 947                 int old_page = ev_document_get_page (view->document);
 948                 int old_width, old_height;
 949
 950                 ev_document_get_page_size (view->document,
 951                                            &old_width, &old_height);
 952
 953                 if (old_page != page) {
 954                         ev_view_set_cursor (view, EV_VIEW_CURSOR_WAIT);
 955                         ev_document_set_page (view->document, page);
 956                 }
 957
 958                 if (old_page != ev_document_get_page (view->document)) {
 959                         int width, height;
 960
 961                         g_signal_emit (view, page_changed_signal, 0);
 962
 963                         view->has_selection = FALSE;
 964                         ev_document_get_page_size (view->document,
 965                                                    &width, &height);
 966                         if (width != old_width || height != old_height)
 967                                 gtk_widget_queue_resize (GTK_WIDGET (view));
 968                 }
 969
 970                 view->find_page = page;
 971                 view->find_result = 0;
 972                 update_find_status_message (view);
 973         }
 974 }
 975
 976 #define MARGIN 5
 977
 978 static void
 979 ensure_rectangle_is_visible (EvView *view, GdkRectangle *rect)
 980 {
 981         GtkWidget *widget = GTK_WIDGET (view);
 982         GtkAdjustment *adjustment;
 983         int value;
 984
 985         adjustment = view->vadjustment;
 986
 987         if (rect->y < adjustment->value) {
 988                 value = MAX (adjustment->lower, rect->y - MARGIN);
 989                 gtk_adjustment_set_value (view->vadjustment, value);
 990         } else if (rect->y + rect->height >
 991                    adjustment->value + widget->allocation.height) {
 992                 value = MIN (adjustment->upper, rect->y + rect->height -
 993                              widget->allocation.height + MARGIN);
 994                 gtk_adjustment_set_value (view->vadjustment, value);
 995         }
 996
 997         adjustment = view->hadjustment;
 998
 999         if (rect->x < adjustment->value) {
1000                 value = MAX (adjustment->lower, rect->x - MARGIN);
1001                 gtk_adjustment_set_value (view->hadjustment, value);
1002         } else if (rect->x + rect->height >
1003                    adjustment->value + widget->allocation.width) {
1004                 value = MIN (adjustment->upper, rect->x + rect->width -
1005                              widget->allocation.width + MARGIN);
1006                 gtk_adjustment_set_value (view->hadjustment, value);
1007         }
1008 }
1009
1010 static void
1011 jump_to_find_result (EvView *view)
1012 {
1013         GdkRectangle rect;
1014
1015         ev_document_find_get_result (EV_DOCUMENT_FIND (view->document),
1016                                      view->find_result, &rect);
1017         ensure_rectangle_is_visible (view, &rect);
1018 }
1019
1020 static void
1021 jump_to_find_page (EvView *view)
1022 {
1023         int n_pages, i;
1024
1025         n_pages = ev_document_get_n_pages (view->document);
1026
1027         for (i = 0; i <= n_pages; i++) {
1028                 int has_results;
1029                 int page;
1030
1031                 page = i + view->find_page;
1032                 if (page > n_pages) {
1033                         page = page - n_pages;
1034                 }
1035
1036                 has_results = ev_document_find_page_has_results
1037                                 (EV_DOCUMENT_FIND (view->document), page);
1038                 if (has_results == -1) {
1039                         view->find_page = page;
1040                         break;
1041                 } else if (has_results == 1) {
1042                         set_document_page (view, page);
1043                         jump_to_find_result (view);
1044                         break;
1045                 }
1046         }
1047 }
1048
1049 static void
1050 find_changed_cb (EvDocument *document, int page, EvView *view)
1051 {
1052         jump_to_find_page (view);
1053         jump_to_find_result (view);
1054         update_find_status_message (view);
1055
1056         if (ev_document_get_page (document) == page) {
1057                 gtk_widget_queue_draw (GTK_WIDGET (view));
1058         }
1059 }
1060
1061 static void
1062 document_changed_callback (EvDocument *document,
1063                            EvView     *view)
1064 {
1065         gtk_widget_queue_draw (GTK_WIDGET (view));
1066         ev_view_set_cursor (view, EV_VIEW_CURSOR_NORMAL);
1067 }
1068
1069 /*** Public API ***/
1070
1071 GtkWidget*
1072 ev_view_new (void)
1073 {
1074         return g_object_new (EV_TYPE_VIEW, NULL);
1075 }
1076
1077 void
1078 ev_view_set_document (EvView     *view,
1079                       EvDocument *document)
1080 {
1081         g_return_if_fail (EV_IS_VIEW (view));
1082
1083         if (document != view->document) {
1084                 if (view->document) {
1085                         g_signal_handlers_disconnect_by_func (view->document,
1086                                                               find_changed_cb,
1087                                                               view);
1088                         g_object_unref (view->document);
1089                 }
1090
1091                 view->document = document;
1092                 view->find_page = 1;
1093                 view->find_result = 0;
1094
1095                 if (view->document) {
1096                         g_object_ref (view->document);
1097                         if (EV_IS_DOCUMENT_FIND (view->document))
1098                                 g_signal_connect (view->document,
1099                                                   "find_changed",
1100                                                   G_CALLBACK (find_changed_cb),
1101                                                   view);
1102                         g_signal_connect (view->document,
1103                                           "changed",
1104                                           G_CALLBACK (document_changed_callback),
1105                                           view);
1106                 }
1107
1108                 if (GTK_WIDGET_REALIZED (view))
1109                         ev_document_set_target (view->document, view->bin_window);
1110
1111                 gtk_widget_queue_resize (GTK_WIDGET (view));
1112
1113                 g_signal_emit (view, page_changed_signal, 0);
1114         }
1115 }
1116
1117 static void
1118 go_to_link (EvView *view, EvLink *link)
1119 {
1120         EvLinkType type;
1121         const char *uri;
1122         int page;
1123
1124         type = ev_link_get_link_type (link);
1125
1126         switch (type) {
1127                 case EV_LINK_TYPE_TITLE:
1128                         break;
1129                 case EV_LINK_TYPE_PAGE:
1130                         page = ev_link_get_page (link);
1131                         set_document_page (view, page);
1132                         break;
1133                 case EV_LINK_TYPE_EXTERNAL_URI:
1134                         uri = ev_link_get_uri (link);
1135                         gnome_vfs_url_show (uri);
1136                         break;
1137         }
1138 }
1139
1140 void
1141 ev_view_go_to_link (EvView *view, EvLink *link)
1142 {
1143         go_to_link (view, link);
1144 }
1145
1146 void
1147 ev_view_set_page (EvView *view,
1148                   int     page)
1149 {
1150         g_return_if_fail (EV_IS_VIEW (view));
1151
1152         set_document_page (view, page);
1153 }
1154
1155 int
1156 ev_view_get_page (EvView *view)
1157 {
1158         if (view->document)
1159                 return ev_document_get_page (view->document);
1160         else
1161                 return 1;
1162 }
1163
1164 #define ZOOM_IN_FACTOR  1.2
1165 #define ZOOM_OUT_FACTOR (1.0/ZOOM_IN_FACTOR)
1166
1167 #define MIN_SCALE 0.05409
1168 #define MAX_SCALE 18.4884
1169
1170 static void
1171 ev_view_zoom (EvView   *view,
1172               double    factor,
1173               gboolean  relative)
1174 {
1175         double scale;
1176
1177         if (relative)
1178                 scale = view->scale * factor;
1179         else
1180                 scale = factor;
1181
1182         view->scale = CLAMP (scale, MIN_SCALE, MAX_SCALE);
1183
1184         ev_document_set_scale (view->document, view->scale);
1185
1186         gtk_widget_queue_resize (GTK_WIDGET (view));
1187 }
1188
1189 void
1190 ev_view_zoom_in (EvView *view)
1191 {
1192         ev_view_zoom (view, ZOOM_IN_FACTOR, TRUE);
1193 }
1194
1195 void
1196 ev_view_zoom_out (EvView *view)
1197 {
1198         ev_view_zoom (view, ZOOM_OUT_FACTOR, TRUE);
1199 }
1200
1201 void
1202 ev_view_normal_size (EvView *view)
1203 {
1204         ev_view_zoom (view, 1.0, FALSE);
1205 }
1206
1207 void
1208 ev_view_best_fit (EvView *view)
1209 {
1210         double scale;
1211         int width, height;
1212
1213         width = height = 0;
1214         ev_document_get_page_size (view->document, &width, &height);
1215
1216         scale = 1.0;
1217         if (width != 0 && height != 0) {
1218                 double scale_w, scale_h;
1219
1220                 scale_w = (double)GTK_WIDGET (view)->allocation.width * view->scale / width;
1221                 scale_h = (double)GTK_WIDGET (view)->allocation.height * view->scale / height;
1222
1223                 scale = (scale_w < scale_h) ? scale_w : scale_h;
1224         }
1225
1226         ev_view_zoom (view, scale, FALSE);
1227 }
1228
1229 void
1230 ev_view_fit_width (EvView *view)
1231 {
1232         double scale = 1.0;
1233         int width;
1234
1235         width = 0;
1236         ev_document_get_page_size (view->document, &width, NULL);
1237
1238         scale = 1.0;
1239         if (width != 0)
1240                 scale = (double)GTK_WIDGET (view)->allocation.width * view->scale / width;
1241
1242         ev_view_zoom (view, scale, FALSE);
1243 }
1244
1245 const char *
1246 ev_view_get_status (EvView *view)
1247 {
1248         g_return_val_if_fail (EV_IS_VIEW (view), NULL);
1249
1250         return view->status;
1251 }
1252
1253 const char *
1254 ev_view_get_find_status (EvView *view)
1255 {
1256         g_return_val_if_fail (EV_IS_VIEW (view), NULL);
1257
1258         return view->find_status;
1259 }
1260
1261 void
1262 ev_view_find_next (EvView *view)
1263 {
1264         int n_results, n_pages;
1265         EvDocumentFind *find = EV_DOCUMENT_FIND (view->document);
1266
1267         n_results = ev_document_find_get_n_results (find);
1268         n_pages = ev_document_get_n_pages (view->document);
1269
1270         view->find_result++;
1271
1272         if (view->find_result >= n_results) {
1273                 view->find_result = 0;
1274                 view->find_page++;
1275
1276                 if (view->find_page > n_pages) {
1277                         view->find_page = 1;
1278                 }
1279
1280                 jump_to_find_page (view);
1281         } else {
1282                 jump_to_find_result (view);
1283                 gtk_widget_queue_draw (GTK_WIDGET (view));
1284         }
1285 }
1286
1287 void
1288 ev_view_find_previous (EvView *view)
1289 {
1290         int n_results, n_pages;
1291         EvDocumentFind *find = EV_DOCUMENT_FIND (view->document);
1292
1293         n_results = ev_document_find_get_n_results (find);
1294         n_pages = ev_document_get_n_pages (view->document);
1295
1296         view->find_result--;
1297
1298         if (view->find_result < 0) {
1299                 view->find_result = 0;
1300                 view->find_page--;
1301
1302                 if (view->find_page < 1) {
1303                         view->find_page = n_pages;
1304                 }
1305
1306                 jump_to_find_page (view);
1307         } else {
1308                 jump_to_find_result (view);
1309                 gtk_widget_queue_draw (GTK_WIDGET (view));
1310         }
1311 }