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
  28 #include "ev-marshal.h"
  29 #include "ev-view.h"
  30 #include "ev-document-find.h"
  31 #include "ev-history.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   TARGET_STRING,
  39   TARGET_TEXT,
  40   TARGET_COMPOUND_TEXT,
  41   TARGET_UTF8_STRING,
  42   TARGET_TEXT_BUFFER_CONTENTS
  43 };
  44
  45 static const GtkTargetEntry targets[] = {
  46         { "STRING", 0, TARGET_STRING },
  47         { "TEXT",   0, TARGET_TEXT },
  48         { "COMPOUND_TEXT", 0, TARGET_COMPOUND_TEXT },
  49         { "UTF8_STRING", 0, TARGET_UTF8_STRING },
  50 };
  51
  52 struct _EvView {
  53         GtkWidget parent_instance;
  54
  55         EvDocument *document;
  56         EvHistory  *history;
  57
  58         GdkWindow *bin_window;
  59
  60         int scroll_x;
  61         int scroll_y;
  62
  63         gboolean has_selection;
  64         GdkRectangle selection;
  65
  66         GtkAdjustment *hadjustment;
  67         GtkAdjustment *vadjustment;
  68
  69         GArray *find_results;
  70         int results_on_this_page;
  71         int next_page_with_result;
  72         double find_percent_complete;
  73
  74         double scale;
  75 };
  76
  77 struct _EvViewClass {
  78         GtkWidgetClass parent_class;
  79
  80         void    (*set_scroll_adjustments) (EvView         *view,
  81                                            GtkAdjustment  *hadjustment,
  82                                            GtkAdjustment  *vadjustment);
  83         void    (*scroll_view)            (EvView         *view,
  84                                            GtkScrollType   scroll,
  85                                            gboolean        horizontal);
  86
  87         /* Should this be notify::page? */
  88         void    (*page_changed)           (EvView         *view);
  89 };
  90
  91 static guint page_changed_signal = 0;
  92
  93 static void ev_view_set_scroll_adjustments (EvView         *view,
  94                                             GtkAdjustment  *hadjustment,
  95                                             GtkAdjustment  *vadjustment);
  96
  97 G_DEFINE_TYPE (EvView, ev_view, GTK_TYPE_WIDGET)
  98
  99 /*** Helper functions ***/
 100
 101 static void
 102 view_update_adjustments (EvView *view)
 103 {
 104         int old_x = view->scroll_x;
 105         int old_y = view->scroll_y;
 106
 107         if (view->hadjustment)
 108                 view->scroll_x = view->hadjustment->value;
 109         else
 110                 view->scroll_x = 0;
 111
 112         if (view->vadjustment)
 113                 view->scroll_y = view->vadjustment->value;
 114         else
 115                 view->scroll_y = 0;
 116
 117         if (GTK_WIDGET_REALIZED (view) &&
 118             (view->scroll_x != old_x || view->scroll_y != old_y)) {
 119                 gdk_window_move (view->bin_window, - view->scroll_x, - view->scroll_y);
 120                 gdk_window_process_updates (view->bin_window, TRUE);
 121         }
 122 }
 123
 124 static void
 125 view_set_adjustment_values (EvView         *view,
 126                             GtkOrientation  orientation)
 127 {
 128         GtkWidget *widget = GTK_WIDGET (view);
 129         GtkAdjustment *adjustment;
 130         gboolean value_changed = FALSE;
 131         int requisition;
 132         int allocation;
 133
 134         if (orientation == GTK_ORIENTATION_HORIZONTAL)  {
 135                 requisition = widget->requisition.width;
 136                 allocation = widget->allocation.width;
 137                 adjustment = view->hadjustment;
 138         } else {
 139                 requisition = widget->requisition.height;
 140                 allocation = widget->allocation.height;
 141                 adjustment = view->vadjustment;
 142         }
 143
 144         if (!adjustment)
 145                 return;
 146
 147         adjustment->page_size = allocation;
 148         adjustment->step_increment = allocation * 0.1;
 149         adjustment->page_increment = allocation * 0.9;
 150         adjustment->lower = 0;
 151         adjustment->upper = MAX (allocation, requisition);
 152
 153         if (adjustment->value > adjustment->upper - adjustment->page_size) {
 154                 adjustment->value = adjustment->upper - adjustment->page_size;
 155                 value_changed = TRUE;
 156         }
 157
 158         gtk_adjustment_changed (adjustment);
 159         if (value_changed)
 160                 gtk_adjustment_value_changed (adjustment);
 161 }
 162
 163 /*** Virtual function implementations ***/
 164
 165 static void
 166 ev_view_finalize (GObject *object)
 167 {
 168         EvView *view = EV_VIEW (object);
 169
 170         if (view->document)
 171                 g_object_unref (view->document);
 172
 173         if (view->history)
 174                 g_object_unref (view->history);
 175
 176         ev_view_set_scroll_adjustments (view, NULL, NULL);
 177
 178         g_array_free (view->find_results, TRUE);
 179         view->find_results = NULL;
 180
 181         G_OBJECT_CLASS (ev_view_parent_class)->finalize (object);
 182 }
 183
 184 static void
 185 ev_view_destroy (GtkObject *object)
 186 {
 187         EvView *view = EV_VIEW (object);
 188
 189         ev_view_set_scroll_adjustments (view, NULL, NULL);
 190
 191         GTK_OBJECT_CLASS (ev_view_parent_class)->destroy (object);
 192 }
 193
 194 static void
 195 ev_view_size_request (GtkWidget      *widget,
 196                       GtkRequisition *requisition)
 197 {
 198         EvView *view = EV_VIEW (widget);
 199
 200         if (GTK_WIDGET_REALIZED (widget)) {
 201                 if (view->document) {
 202                         ev_document_get_page_size (view->document,
 203                                                    &requisition->width,
 204                                                    &requisition->height);
 205                 } else {
 206                         requisition->width = 10;
 207                         requisition->height = 10;
 208                 }
 209         }
 210
 211 }
 212
 213 static void
 214 ev_view_size_allocate (GtkWidget      *widget,
 215                        GtkAllocation  *allocation)
 216 {
 217         EvView *view = EV_VIEW (widget);
 218
 219         GTK_WIDGET_CLASS (ev_view_parent_class)->size_allocate (widget, allocation);
 220
 221         view_set_adjustment_values (view, GTK_ORIENTATION_HORIZONTAL);
 222         view_set_adjustment_values (view, GTK_ORIENTATION_VERTICAL);
 223
 224         if (GTK_WIDGET_REALIZED (widget)) {
 225                 gdk_window_resize (view->bin_window,
 226                                    MAX (widget->allocation.width, widget->requisition.width),
 227                                    MAX (widget->allocation.height, widget->requisition.height));
 228         }
 229 }
 230
 231 static void
 232 update_window_backgrounds (EvView *view)
 233 {
 234         GtkWidget *widget = GTK_WIDGET (view);
 235
 236         if (GTK_WIDGET_REALIZED (view)) {
 237                 gdk_window_set_background (view->bin_window,
 238                                            &widget->style->base[GTK_WIDGET_STATE (widget)]);
 239         }
 240 }
 241
 242 static void
 243 ev_view_realize (GtkWidget *widget)
 244 {
 245         EvView *view = EV_VIEW (widget);
 246         GdkWindowAttr attributes;
 247
 248         GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 249
 250         attributes.window_type = GDK_WINDOW_CHILD;
 251         attributes.wclass = GDK_INPUT_OUTPUT;
 252         attributes.visual = gtk_widget_get_visual (widget);
 253         attributes.colormap = gtk_widget_get_colormap (widget);
 254
 255         attributes.x = widget->allocation.x;
 256         attributes.y = widget->allocation.y;
 257         attributes.width = widget->allocation.width;
 258         attributes.height = widget->allocation.height;
 259         attributes.event_mask = 0;
 260
 261         widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
 262                                          &attributes,
 263                                          GDK_WA_X | GDK_WA_Y |
 264                                          GDK_WA_COLORMAP |
 265                                          GDK_WA_VISUAL);
 266         gdk_window_set_user_data (widget->window, widget);
 267         widget->style = gtk_style_attach (widget->style, widget->window);
 268
 269         attributes.x = 0;
 270         attributes.y = 0;
 271         attributes.width = MAX (widget->allocation.width, widget->requisition.width);
 272         attributes.height = MAX (widget->allocation.height, widget->requisition.height);
 273         attributes.event_mask = GDK_EXPOSURE_MASK |
 274                                 GDK_BUTTON_PRESS_MASK |
 275                                 GDK_BUTTON_RELEASE_MASK |
 276                                 GDK_SCROLL_MASK |
 277                                 GDK_KEY_PRESS_MASK |
 278                                 GDK_BUTTON1_MOTION_MASK;
 279
 280         view->bin_window = gdk_window_new (widget->window,
 281                                            &attributes,
 282                                            GDK_WA_X | GDK_WA_Y |
 283                                            GDK_WA_COLORMAP |
 284                                            GDK_WA_VISUAL);
 285         gdk_window_set_user_data (view->bin_window, widget);
 286         gdk_window_show (view->bin_window);
 287
 288         if (view->document) {
 289                 ev_document_set_target (view->document, view->bin_window);
 290
 291                 /* We can't get page size without a target, so we have to
 292                  * queue a size request at realization. Could be fixed
 293                  * with EvDocument changes to allow setting a GdkScreen
 294                  * without setting a target.
 295                  */
 296                 gtk_widget_queue_resize (widget);
 297         }
 298
 299         update_window_backgrounds (view);
 300 }
 301
 302 static void
 303 ev_view_unrealize (GtkWidget *widget)
 304 {
 305         EvView *view = EV_VIEW (widget);
 306
 307         if (view->document)
 308                 ev_document_set_target (view->document, NULL);
 309
 310         gdk_window_set_user_data (view->bin_window, NULL);
 311         gdk_window_destroy (view->bin_window);
 312         view->bin_window = NULL;
 313
 314         GTK_WIDGET_CLASS (ev_view_parent_class)->unrealize (widget);
 315 }
 316
 317 static void
 318 ev_view_style_set (GtkWidget      *widget,
 319                    GtkStyle       *previous_style)
 320 {
 321         update_window_backgrounds (EV_VIEW (widget));
 322 }
 323
 324 static void
 325 ev_view_state_changed (GtkWidget    *widget,
 326                        GtkStateType  previous_state)
 327 {
 328         update_window_backgrounds (EV_VIEW (widget));
 329 }
 330
 331 static guint32
 332 ev_gdk_color_to_rgb (const GdkColor *color)
 333 {
 334   guint32 result;
 335   result = (0xff0000 | (color->red & 0xff00));
 336   result <<= 8;
 337   result |= ((color->green & 0xff00) | (color->blue >> 8));
 338   return result;
 339 }
 340
 341 static void
 342 draw_rubberband (GtkWidget *widget, GdkWindow *window, const GdkRectangle *rect)
 343 {
 344         GdkGC *gc;
 345         GdkPixbuf *pixbuf;
 346         GdkColor *fill_color_gdk;
 347         guint fill_color;
 348
 349         fill_color_gdk = gdk_color_copy (&GTK_WIDGET (widget)->style->base[GTK_STATE_SELECTED]);
 350         fill_color = ev_gdk_color_to_rgb (fill_color_gdk) << 8 | 0x40;
 351
 352         pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8,
 353                                  rect->width, rect->height);
 354         gdk_pixbuf_fill (pixbuf, fill_color);
 355
 356         gdk_draw_pixbuf (window, NULL, pixbuf,
 357                          0, 0,
 358                          rect->x,rect->y,
 359                          rect->width, rect->height,
 360                          GDK_RGB_DITHER_NONE,
 361                          0, 0);
 362
 363         g_object_unref (pixbuf);
 364
 365         gc = gdk_gc_new (window);
 366         gdk_gc_set_rgb_fg_color (gc, fill_color_gdk);
 367         gdk_draw_rectangle (window, gc, FALSE,
 368                             rect->x, rect->y,
 369                             rect->width - 1,
 370                             rect->height - 1);
 371         g_object_unref (gc);
 372
 373         gdk_color_free (fill_color_gdk);
 374 }
 375
 376 static void
 377 expose_bin_window (GtkWidget      *widget,
 378                    GdkEventExpose *event)
 379 {
 380         EvView *view = EV_VIEW (widget);
 381         int i;
 382         int current_page;
 383         const EvFindResult *results;
 384
 385         if (view->document == NULL)
 386                 return;
 387
 388         ev_document_render (view->document,
 389                             event->area.x, event->area.y,
 390                             event->area.width, event->area.height);
 391
 392         results = (EvFindResult*) view->find_results->data;
 393         current_page = ev_document_get_page (view->document);
 394         i = 0;
 395         while (i < view->find_results->len) {
 396 #if 0
 397                 g_printerr ("highlighting result %d page %d at %d,%d %dx%d\n",
 398                             i, results[i].page_num,
 399                             results[i].highlight_area.x,
 400                             results[i].highlight_area.y,
 401                             results[i].highlight_area.width,
 402                             results[i].highlight_area.height);
 403 #endif
 404                 if (results[i].page_num == current_page)
 405                         draw_rubberband (widget, view->bin_window,
 406                                          &results[i].highlight_area);
 407                 ++i;
 408         }
 409
 410         if (view->has_selection) {
 411                 draw_rubberband (widget, view->bin_window, &view->selection);
 412         }
 413 }
 414
 415 static gboolean
 416 ev_view_expose_event (GtkWidget      *widget,
 417                       GdkEventExpose *event)
 418 {
 419         EvView *view = EV_VIEW (widget);
 420
 421         if (event->window == view->bin_window)
 422                 expose_bin_window (widget, event);
 423         else
 424                 return GTK_WIDGET_CLASS (ev_view_parent_class)->expose_event (widget, event);
 425
 426         return FALSE;
 427 }
 428
 429 void
 430 ev_view_select_all (EvView *ev_view)
 431 {
 432         GtkWidget *widget = GTK_WIDGET (ev_view);
 433
 434         g_return_if_fail (EV_IS_VIEW (ev_view));
 435
 436         ev_view->has_selection = TRUE;
 437         ev_view->selection.x = ev_view->selection.y = 0;
 438         ev_view->selection.width = widget->requisition.width;
 439         ev_view->selection.height = widget->requisition.height;
 440
 441         gtk_widget_queue_draw (widget);
 442 }
 443
 444 void
 445 ev_view_copy (EvView *ev_view)
 446 {
 447         GtkClipboard *clipboard;
 448         char *text;
 449
 450         text = ev_document_get_text (ev_view->document, &ev_view->selection);
 451         clipboard = gtk_widget_get_clipboard (GTK_WIDGET (ev_view),
 452                                               GDK_SELECTION_CLIPBOARD);
 453         gtk_clipboard_set_text (clipboard, text, -1);
 454         g_free (text);
 455 }
 456
 457 static void
 458 ev_view_primary_get_cb (GtkClipboard     *clipboard,
 459                         GtkSelectionData *selection_data,
 460                         guint             info,
 461                         gpointer          data)
 462 {
 463         EvView *ev_view = EV_VIEW (data);
 464         char *text;
 465
 466         text = ev_document_get_text (ev_view->document, &ev_view->selection);
 467         gtk_selection_data_set_text (selection_data, text, -1);
 468 }
 469
 470 static void
 471 ev_view_primary_clear_cb (GtkClipboard *clipboard,
 472                           gpointer      data)
 473 {
 474         EvView *ev_view = EV_VIEW (data);
 475
 476         ev_view->has_selection = FALSE;
 477 }
 478
 479 static void
 480 ev_view_update_primary_selection (EvView *ev_view)
 481 {
 482         GtkClipboard *clipboard;
 483
 484         clipboard = gtk_widget_get_clipboard (GTK_WIDGET (ev_view),
 485                                               GDK_SELECTION_PRIMARY);
 486
 487         if (ev_view->has_selection) {
 488                 if (!gtk_clipboard_set_with_owner (clipboard,
 489                                                    targets,
 490                                                    G_N_ELEMENTS (targets),
 491                                                    ev_view_primary_get_cb,
 492                                                    ev_view_primary_clear_cb,
 493                                                    G_OBJECT (ev_view)))
 494                         ev_view_primary_clear_cb (clipboard, ev_view);
 495         } else {
 496                 if (gtk_clipboard_get_owner (clipboard) == G_OBJECT (ev_view))
 497                         gtk_clipboard_clear (clipboard);
 498         }
 499 }
 500
 501 static gboolean
 502 ev_view_button_press_event (GtkWidget      *widget,
 503                             GdkEventButton *event)
 504 {
 505         EvView *view = EV_VIEW (widget);
 506
 507         if (!GTK_WIDGET_HAS_FOCUS (widget)) {
 508                 gtk_widget_grab_focus (widget);
 509         }
 510
 511         switch (event->button) {
 512                 case 1:
 513                         if (view->has_selection) {
 514                                 view->has_selection = FALSE;
 515                                 gtk_widget_queue_draw (widget);
 516                         }
 517
 518                         view->selection.x = event->x;
 519                         view->selection.y = event->y;
 520                         view->selection.width = 0;
 521                         view->selection.height = 0;
 522                         break;
 523         }
 524
 525         return TRUE;
 526 }
 527
 528 static gboolean
 529 ev_view_motion_notify_event (GtkWidget      *widget,
 530                              GdkEventMotion *event)
 531 {
 532         EvView *view = EV_VIEW (widget);
 533
 534         view->has_selection = TRUE;
 535         view->selection.x = MIN (view->selection.x, event->x);
 536         view->selection.y = MIN (view->selection.y, event->y);
 537         view->selection.width = ABS (view->selection.x - event->x) + 1;
 538         view->selection.height = ABS (view->selection.y - event->y) + 1;
 539
 540         gtk_widget_queue_draw (widget);
 541
 542         return TRUE;
 543 }
 544
 545 static gboolean
 546 ev_view_button_release_event (GtkWidget      *widget,
 547                               GdkEventButton *event)
 548 {
 549         EvView *view = EV_VIEW (widget);
 550
 551         ev_view_update_primary_selection (view);
 552
 553         return FALSE;
 554 }
 555
 556 static void
 557 on_adjustment_value_changed (GtkAdjustment  *adjustment,
 558                              EvView *view)
 559 {
 560         view_update_adjustments (view);
 561 }
 562
 563 static void
 564 set_scroll_adjustment (EvView *view,
 565                        GtkOrientation  orientation,
 566                        GtkAdjustment  *adjustment)
 567 {
 568         GtkAdjustment **to_set;
 569
 570         if (orientation == GTK_ORIENTATION_HORIZONTAL)
 571                 to_set = &view->hadjustment;
 572         else
 573                 to_set = &view->vadjustment;
 574
 575         if (*to_set != adjustment) {
 576                 if (*to_set) {
 577                         g_signal_handlers_disconnect_by_func (*to_set,
 578                                                               (gpointer) on_adjustment_value_changed,
 579                                                               view);
 580                         g_object_unref (*to_set);
 581                 }
 582
 583                 *to_set = adjustment;
 584                 view_set_adjustment_values (view, orientation);
 585
 586                 if (*to_set) {
 587                         g_object_ref (*to_set);
 588                         g_signal_connect (*to_set, "value_changed",
 589                                           G_CALLBACK (on_adjustment_value_changed), view);
 590                 }
 591         }
 592 }
 593
 594 static void
 595 ev_view_set_scroll_adjustments (EvView *view,
 596                                 GtkAdjustment  *hadjustment,
 597                                 GtkAdjustment  *vadjustment)
 598 {
 599         set_scroll_adjustment (view, GTK_ORIENTATION_HORIZONTAL, hadjustment);
 600         set_scroll_adjustment (view, GTK_ORIENTATION_VERTICAL, vadjustment);
 601
 602         view_update_adjustments (view);
 603 }
 604
 605 static void
 606 add_scroll_binding (GtkBindingSet  *binding_set,
 607                     guint           keyval,
 608                     GtkScrollType   scroll,
 609                     gboolean        horizontal)
 610 {
 611   guint keypad_keyval = keyval - GDK_Left + GDK_KP_Left;
 612
 613   gtk_binding_entry_add_signal (binding_set, keyval, 0,
 614                                 "scroll_view", 2,
 615                                 GTK_TYPE_SCROLL_TYPE, scroll,
 616                                 G_TYPE_BOOLEAN, horizontal);
 617   gtk_binding_entry_add_signal (binding_set, keypad_keyval, 0,
 618                                 "scroll_view", 2,
 619                                 GTK_TYPE_SCROLL_TYPE, scroll,
 620                                 G_TYPE_BOOLEAN, horizontal);
 621 }
 622
 623 static void
 624 ev_view_scroll_view (EvView *view,
 625                      GtkScrollType scroll,
 626                      gboolean horizontal)
 627 {
 628         if (scroll == GTK_SCROLL_PAGE_BACKWARD) {
 629                 ev_view_set_page (view, ev_view_get_page (view) - 1);
 630         } else if (scroll == GTK_SCROLL_PAGE_FORWARD) {
 631                 ev_view_set_page (view, ev_view_get_page (view) + 1);
 632         } else {
 633                 GtkAdjustment *adjustment;
 634                 double value;
 635
 636                 if (horizontal) {
 637                         adjustment = view->hadjustment;
 638                 } else {
 639                         adjustment = view->vadjustment;
 640                 }
 641
 642                 value = adjustment->value;
 643
 644                 switch (scroll) {
 645                         case GTK_SCROLL_STEP_BACKWARD:
 646                                 value -= adjustment->step_increment;
 647                                 break;
 648                         case GTK_SCROLL_STEP_FORWARD:
 649                                 value += adjustment->step_increment;
 650                                 break;
 651                         default:
 652                                 break;
 653                 }
 654
 655                 value = CLAMP (value, adjustment->lower,
 656                                adjustment->upper - adjustment->page_size);
 657
 658                 gtk_adjustment_set_value (adjustment, value);
 659         }
 660 }
 661
 662 static void
 663 ev_view_class_init (EvViewClass *class)
 664 {
 665         GObjectClass *object_class = G_OBJECT_CLASS (class);
 666         GtkObjectClass *gtk_object_class = GTK_OBJECT_CLASS (class);
 667         GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
 668         GtkBindingSet *binding_set;
 669
 670         object_class->finalize = ev_view_finalize;
 671
 672         widget_class->expose_event = ev_view_expose_event;
 673         widget_class->button_press_event = ev_view_button_press_event;
 674         widget_class->motion_notify_event = ev_view_motion_notify_event;
 675         widget_class->button_release_event = ev_view_button_release_event;
 676         widget_class->size_request = ev_view_size_request;
 677         widget_class->size_allocate = ev_view_size_allocate;
 678         widget_class->realize = ev_view_realize;
 679         widget_class->unrealize = ev_view_unrealize;
 680         widget_class->style_set = ev_view_style_set;
 681         widget_class->state_changed = ev_view_state_changed;
 682         gtk_object_class->destroy = ev_view_destroy;
 683
 684         class->set_scroll_adjustments = ev_view_set_scroll_adjustments;
 685         class->scroll_view = ev_view_scroll_view;
 686
 687         widget_class->set_scroll_adjustments_signal =  g_signal_new ("set-scroll-adjustments",
 688                                                                      G_OBJECT_CLASS_TYPE (object_class),
 689                                                                      G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 690                                                                      G_STRUCT_OFFSET (EvViewClass, set_scroll_adjustments),
 691                                                                      NULL, NULL,
 692                                                                      ev_marshal_VOID__OBJECT_OBJECT,
 693                                                                      G_TYPE_NONE, 2,
 694                                                                      GTK_TYPE_ADJUSTMENT,
 695                                                                      GTK_TYPE_ADJUSTMENT);
 696         page_changed_signal = g_signal_new ("page-changed",
 697                                             G_OBJECT_CLASS_TYPE (object_class),
 698                                             G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 699                                             G_STRUCT_OFFSET (EvViewClass, page_changed),
 700                                             NULL, NULL,
 701                                             ev_marshal_VOID__NONE,
 702                                             G_TYPE_NONE, 0);
 703
 704         g_signal_new ("find-status-changed",
 705                       G_OBJECT_CLASS_TYPE (object_class),
 706                       G_SIGNAL_RUN_LAST,
 707                       0,
 708                       NULL, NULL,
 709                       ev_marshal_VOID__NONE,
 710                       G_TYPE_NONE, 0);
 711
 712         g_signal_new ("scroll_view",
 713                       G_TYPE_FROM_CLASS (object_class),
 714                       G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 715                       G_STRUCT_OFFSET (EvViewClass, scroll_view),
 716                       NULL, NULL,
 717                       ev_marshal_VOID__ENUM_BOOLEAN,
 718                       G_TYPE_NONE, 2,
 719                       GTK_TYPE_SCROLL_TYPE,
 720                       G_TYPE_BOOLEAN);
 721
 722         binding_set = gtk_binding_set_by_class (class);
 723
 724         add_scroll_binding (binding_set, GDK_Left,  GTK_SCROLL_STEP_BACKWARD, TRUE);
 725         add_scroll_binding (binding_set, GDK_Right, GTK_SCROLL_STEP_FORWARD,  TRUE);
 726         add_scroll_binding (binding_set, GDK_Up,    GTK_SCROLL_STEP_BACKWARD, FALSE);
 727         add_scroll_binding (binding_set, GDK_Down,  GTK_SCROLL_STEP_FORWARD,  FALSE);
 728
 729         add_scroll_binding (binding_set, GDK_Page_Up,   GTK_SCROLL_PAGE_BACKWARD, FALSE);
 730         add_scroll_binding (binding_set, GDK_Page_Down, GTK_SCROLL_PAGE_FORWARD,  FALSE);
 731 }
 732
 733 static void
 734 ev_view_init (EvView *view)
 735 {
 736         static const GdkColor white = { 0, 0xffff, 0xffff, 0xffff };
 737
 738         GTK_WIDGET_SET_FLAGS (view, GTK_CAN_FOCUS);
 739
 740         view->scale = 1.0;
 741
 742         gtk_widget_modify_bg (GTK_WIDGET (view), GTK_STATE_NORMAL, &white);
 743
 744         view->find_results = g_array_new (FALSE,
 745                                           FALSE,
 746                                           sizeof (EvFindResult));
 747         view->results_on_this_page = 0;
 748         view->next_page_with_result = 0;
 749 }
 750
 751 static void
 752 update_find_results (EvView *view)
 753 {
 754         const EvFindResult *results;
 755         int i;
 756         int on_this_page;
 757         int next_page_with_result;
 758         int earliest_page_with_result;
 759         int current_page;
 760         gboolean counts_changed;
 761
 762         results = (EvFindResult*) view->find_results->data;
 763         current_page = ev_document_get_page (view->document);
 764         next_page_with_result = 0;
 765         on_this_page = 0;
 766         earliest_page_with_result = 0;
 767
 768         i = 0;
 769         while (i < view->find_results->len) {
 770                 if (results[i].page_num == current_page) {
 771                         ++on_this_page;
 772                 } else {
 773                         int delta = results[i].page_num - current_page;
 774
 775                         if (delta > 0 && /* result on later page */
 776                             (next_page_with_result == 0 ||
 777                              results[i].page_num < next_page_with_result))
 778                                 next_page_with_result = results[i].page_num;
 779
 780                         if (delta < 0 && /* result on a previous page */
 781                             (earliest_page_with_result == 0 ||
 782                              results[i].page_num < earliest_page_with_result))
 783                                 earliest_page_with_result = results[i].page_num;
 784                 }
 785                 ++i;
 786         }
 787
 788         /* If earliest page is just the current page, there is no earliest page */
 789         if (earliest_page_with_result == current_page)
 790                 earliest_page_with_result = 0;
 791
 792         /* If no next page, then wrap and the wrapped page is the next page */
 793         if (next_page_with_result == 0)
 794                 next_page_with_result = earliest_page_with_result;
 795
 796         counts_changed = FALSE;
 797         if (on_this_page != view->results_on_this_page ||
 798             next_page_with_result != view->next_page_with_result) {
 799                 view->results_on_this_page = on_this_page;
 800                 view->next_page_with_result = next_page_with_result;
 801                 counts_changed = TRUE;
 802         }
 803
 804         /* If there are no results at all, then the
 805          * results of ev_view_get_find_status_message() will change
 806          * to reflect the percent_complete so we have to emit the signal
 807          */
 808         if (counts_changed ||
 809             view->find_results->len == 0) {
 810                 g_signal_emit_by_name (view,
 811                                        "find-status-changed");
 812         }
 813 }
 814
 815 static void
 816 found_results_callback (EvDocument         *document,
 817                         const EvFindResult *results,
 818                         int                 n_results,
 819                         double              percent_complete,
 820                         void               *data)
 821 {
 822   EvView *view = EV_VIEW (data);
 823
 824   g_array_set_size (view->find_results, 0);
 825
 826   if (n_results > 0)
 827           g_array_append_vals (view->find_results,
 828                                results, n_results);
 829
 830 #if 0
 831   {
 832           int i;
 833
 834           g_printerr ("%d results %d%%: ", n_results,
 835                       (int) (percent_complete * 100));
 836           i = 0;
 837           while (i < n_results) {
 838                   g_printerr ("%d ", results[i].page_num);
 839                   ++i;
 840           }
 841           g_printerr ("\n");
 842   }
 843 #endif
 844
 845   view->find_percent_complete = percent_complete;
 846   update_find_results (view);
 847
 848   gtk_widget_queue_draw (GTK_WIDGET (view));
 849 }
 850
 851 /*** Public API ***/
 852
 853 GtkWidget*
 854 ev_view_new (void)
 855 {
 856         return g_object_new (EV_TYPE_VIEW, NULL);
 857 }
 858
 859 static void
 860 document_changed_callback (EvDocument *document,
 861                            EvView     *view)
 862 {
 863         gtk_widget_queue_draw (GTK_WIDGET (view));
 864 }
 865
 866 void
 867 ev_view_set_document (EvView     *view,
 868                       EvDocument *document)
 869 {
 870         g_return_if_fail (EV_IS_VIEW (view));
 871
 872         if (document != view->document) {
 873                 int old_page = ev_view_get_page (view);
 874
 875                 if (view->document) {
 876                         g_signal_handlers_disconnect_by_func (view->document,
 877                                                               found_results_callback,
 878                                                               view);
 879                         g_array_set_size (view->find_results, 0);
 880                         view->results_on_this_page = 0;
 881                         view->next_page_with_result = 0;
 882
 883                         g_object_unref (view->document);
 884                 }
 885
 886                 view->document = document;
 887
 888                 if (view->document) {
 889                         g_object_ref (view->document);
 890                         if (EV_IS_DOCUMENT_FIND (view->document))
 891                                 g_signal_connect (view->document,
 892                                                   "found",
 893                                                   G_CALLBACK (found_results_callback),
 894                                                   view);
 895                         g_signal_connect (view->document,
 896                                           "changed",
 897                                           G_CALLBACK (document_changed_callback),
 898                                           view);
 899                 }
 900
 901                 if (GTK_WIDGET_REALIZED (view))
 902                         ev_document_set_target (view->document, view->bin_window);
 903
 904                 gtk_widget_queue_resize (GTK_WIDGET (view));
 905
 906                 if (old_page != ev_view_get_page (view))
 907                         g_signal_emit (view, page_changed_signal, 0);
 908
 909                 if (view->history) {
 910                         g_object_unref (view->history);
 911                 }
 912                 view->history = ev_history_new ();
 913         }
 914 }
 915
 916 static void
 917 set_document_page (EvView *view, int page)
 918 {
 919         if (view->document) {
 920                 int old_page = ev_document_get_page (view->document);
 921                 if (old_page != page)
 922                         ev_document_set_page (view->document, page);
 923                 if (old_page != ev_document_get_page (view->document)) {
 924                         g_signal_emit (view, page_changed_signal, 0);
 925
 926                         view->find_percent_complete = 0.0;
 927                         update_find_results (view);
 928                 }
 929         }
 930 }
 931
 932 static void
 933 go_to_bookmark (EvView *view, EvBookmark *bookmark)
 934 {
 935         EvBookmarkType type;
 936         int page;
 937
 938         type = ev_bookmark_get_bookmark_type (bookmark);
 939
 940         if (type == EV_BOOKMARK_TYPE_LINK) {
 941                 page = ev_bookmark_get_page (bookmark);
 942                 set_document_page (view, page);
 943         }
 944 }
 945
 946 void
 947 ev_view_go_to_bookmark (EvView *view, EvBookmark *bookmark)
 948 {
 949         go_to_bookmark (view, bookmark);
 950         ev_history_add_link (view->history, bookmark);
 951 }
 952
 953 static void
 954 go_to_index (EvView *view, int index)
 955 {
 956         EvBookmark *bookmark;
 957
 958         bookmark = ev_history_get_link_nth (view->history, index);
 959         g_return_if_fail (bookmark != NULL);
 960
 961         go_to_bookmark (view, bookmark);
 962 }
 963
 964 void
 965 ev_view_go_back (EvView *view)
 966 {
 967         int index;
 968
 969         g_return_if_fail (EV_IS_HISTORY (view->history));
 970
 971         index = ev_history_get_current_index (view->history);
 972         index = MAX (0, index - 1);
 973
 974         ev_history_set_current_index (view->history, index);
 975         go_to_index (view, index);
 976 }
 977
 978 void
 979 ev_view_go_forward (EvView *view)
 980 {
 981         int index, n;
 982
 983         g_return_if_fail (EV_IS_HISTORY (view->history));
 984
 985         index = ev_history_get_current_index (view->history);
 986         n = ev_history_get_n_links (view->history);
 987
 988         index = MIN (n - 1, index + 1);
 989
 990         ev_history_set_current_index (view->history, index);
 991         go_to_index (view, index);
 992 }
 993
 994
 995 void
 996 ev_view_set_page (EvView *view,
 997                   int     page)
 998 {
 999         g_return_if_fail (EV_IS_VIEW (view));
1000         g_return_if_fail (EV_IS_HISTORY (view->history));
1001
1002         set_document_page (view, page);
1003         ev_history_add_page (view->history, page);
1004 }
1005
1006 int
1007 ev_view_get_page (EvView *view)
1008 {
1009         if (view->document)
1010                 return ev_document_get_page (view->document);
1011         else
1012                 return 1;
1013 }
1014
1015 #define ZOOM_IN_FACTOR  1.2
1016 #define ZOOM_OUT_FACTOR (1.0/ZOOM_IN_FACTOR)
1017
1018 #define MIN_SCALE 0.05409
1019 #define MAX_SCALE 18.4884
1020
1021 static void
1022 ev_view_zoom (EvView   *view,
1023               double    factor,
1024               gboolean  relative)
1025 {
1026         double scale;
1027
1028         if (relative)
1029                 scale = view->scale * factor;
1030         else
1031                 scale = factor;
1032
1033         view->scale = CLAMP (scale, MIN_SCALE, MAX_SCALE);
1034
1035         ev_document_set_scale (view->document, view->scale);
1036
1037         gtk_widget_queue_resize (GTK_WIDGET (view));
1038 }
1039
1040 void
1041 ev_view_zoom_in (EvView *view)
1042 {
1043         ev_view_zoom (view, ZOOM_IN_FACTOR, TRUE);
1044 }
1045
1046 void
1047 ev_view_zoom_out (EvView *view)
1048 {
1049         ev_view_zoom (view, ZOOM_OUT_FACTOR, TRUE);
1050 }
1051
1052 void
1053 ev_view_normal_size (EvView *view)
1054 {
1055         ev_view_zoom (view, 1.0, FALSE);
1056 }
1057
1058 void
1059 ev_view_best_fit (EvView *view)
1060 {
1061         double scale;
1062         int width, height;
1063
1064         width = height = 0;
1065         ev_document_get_page_size (view->document, &width, &height);
1066
1067         scale = 1.0;
1068         if (width != 0 && height != 0) {
1069                 double scale_w, scale_h;
1070
1071                 scale_w = (double)GTK_WIDGET (view)->allocation.width * view->scale / width;
1072                 scale_h = (double)GTK_WIDGET (view)->allocation.height * view->scale / height;
1073
1074                 scale = (scale_w < scale_h) ? scale_w : scale_h;
1075         }
1076
1077         ev_view_zoom (view, scale, FALSE);
1078 }
1079
1080 void
1081 ev_view_fit_width (EvView *view)
1082 {
1083         double scale = 1.0;
1084         int width;
1085
1086         width = 0;
1087         ev_document_get_page_size (view->document, &width, NULL);
1088
1089         scale = 1.0;
1090         if (width != 0)
1091                 scale = (double)GTK_WIDGET (view)->allocation.width * view->scale / width;
1092
1093         ev_view_zoom (view, scale, FALSE);
1094 }
1095
1096 char*
1097 ev_view_get_find_status_message (EvView *view)
1098 {
1099         if (view->find_results->len == 0) {
1100                 if (view->find_percent_complete >= (1.0 - 1e-10)) {
1101                         return g_strdup (_("Not found"));
1102                 } else {
1103                         return g_strdup_printf (_("%3d%% remaining to search"),
1104                                                 (int) ((1.0 - view->find_percent_complete) * 100));
1105                 }
1106         } else if (view->results_on_this_page == 0) {
1107                 g_assert (view->next_page_with_result != 0);
1108                 return g_strdup_printf (_("Found on page %d"),
1109                                         view->next_page_with_result);
1110         } else {
1111                 return g_strdup_printf (_("%d found on this page"),
1112                                         view->results_on_this_page);
1113         }
1114 }