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   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         if (view->has_selection) {
 552                 ev_view_update_primary_selection (view);
 553         } else {
 554                 EvLink *link;
 555
 556                 link = ev_document_get_link (view->document,
 557                                              event->x,
 558                                              event->y);
 559                 if (link) {
 560                         ev_view_go_to_link (view, link);
 561                         g_object_unref (link);
 562                 }
 563         }
 564
 565         return FALSE;
 566 }
 567
 568 static void
 569 on_adjustment_value_changed (GtkAdjustment  *adjustment,
 570                              EvView *view)
 571 {
 572         view_update_adjustments (view);
 573 }
 574
 575 static void
 576 set_scroll_adjustment (EvView *view,
 577                        GtkOrientation  orientation,
 578                        GtkAdjustment  *adjustment)
 579 {
 580         GtkAdjustment **to_set;
 581
 582         if (orientation == GTK_ORIENTATION_HORIZONTAL)
 583                 to_set = &view->hadjustment;
 584         else
 585                 to_set = &view->vadjustment;
 586
 587         if (*to_set != adjustment) {
 588                 if (*to_set) {
 589                         g_signal_handlers_disconnect_by_func (*to_set,
 590                                                               (gpointer) on_adjustment_value_changed,
 591                                                               view);
 592                         g_object_unref (*to_set);
 593                 }
 594
 595                 *to_set = adjustment;
 596                 view_set_adjustment_values (view, orientation);
 597
 598                 if (*to_set) {
 599                         g_object_ref (*to_set);
 600                         g_signal_connect (*to_set, "value_changed",
 601                                           G_CALLBACK (on_adjustment_value_changed), view);
 602                 }
 603         }
 604 }
 605
 606 static void
 607 ev_view_set_scroll_adjustments (EvView *view,
 608                                 GtkAdjustment  *hadjustment,
 609                                 GtkAdjustment  *vadjustment)
 610 {
 611         set_scroll_adjustment (view, GTK_ORIENTATION_HORIZONTAL, hadjustment);
 612         set_scroll_adjustment (view, GTK_ORIENTATION_VERTICAL, vadjustment);
 613
 614         view_update_adjustments (view);
 615 }
 616
 617 static void
 618 add_scroll_binding (GtkBindingSet  *binding_set,
 619                     guint           keyval,
 620                     GtkScrollType   scroll,
 621                     gboolean        horizontal)
 622 {
 623   guint keypad_keyval = keyval - GDK_Left + GDK_KP_Left;
 624
 625   gtk_binding_entry_add_signal (binding_set, keyval, 0,
 626                                 "scroll_view", 2,
 627                                 GTK_TYPE_SCROLL_TYPE, scroll,
 628                                 G_TYPE_BOOLEAN, horizontal);
 629   gtk_binding_entry_add_signal (binding_set, keypad_keyval, 0,
 630                                 "scroll_view", 2,
 631                                 GTK_TYPE_SCROLL_TYPE, scroll,
 632                                 G_TYPE_BOOLEAN, horizontal);
 633 }
 634
 635 static void
 636 ev_view_scroll_view (EvView *view,
 637                      GtkScrollType scroll,
 638                      gboolean horizontal)
 639 {
 640         if (scroll == GTK_SCROLL_PAGE_BACKWARD) {
 641                 ev_view_set_page (view, ev_view_get_page (view) - 1);
 642         } else if (scroll == GTK_SCROLL_PAGE_FORWARD) {
 643                 ev_view_set_page (view, ev_view_get_page (view) + 1);
 644         } else {
 645                 GtkAdjustment *adjustment;
 646                 double value;
 647
 648                 if (horizontal) {
 649                         adjustment = view->hadjustment;
 650                 } else {
 651                         adjustment = view->vadjustment;
 652                 }
 653
 654                 value = adjustment->value;
 655
 656                 switch (scroll) {
 657                         case GTK_SCROLL_STEP_BACKWARD:
 658                                 value -= adjustment->step_increment;
 659                                 break;
 660                         case GTK_SCROLL_STEP_FORWARD:
 661                                 value += adjustment->step_increment;
 662                                 break;
 663                         default:
 664                                 break;
 665                 }
 666
 667                 value = CLAMP (value, adjustment->lower,
 668                                adjustment->upper - adjustment->page_size);
 669
 670                 gtk_adjustment_set_value (adjustment, value);
 671         }
 672 }
 673
 674 static void
 675 ev_view_class_init (EvViewClass *class)
 676 {
 677         GObjectClass *object_class = G_OBJECT_CLASS (class);
 678         GtkObjectClass *gtk_object_class = GTK_OBJECT_CLASS (class);
 679         GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
 680         GtkBindingSet *binding_set;
 681
 682         object_class->finalize = ev_view_finalize;
 683
 684         widget_class->expose_event = ev_view_expose_event;
 685         widget_class->button_press_event = ev_view_button_press_event;
 686         widget_class->motion_notify_event = ev_view_motion_notify_event;
 687         widget_class->button_release_event = ev_view_button_release_event;
 688         widget_class->size_request = ev_view_size_request;
 689         widget_class->size_allocate = ev_view_size_allocate;
 690         widget_class->realize = ev_view_realize;
 691         widget_class->unrealize = ev_view_unrealize;
 692         widget_class->style_set = ev_view_style_set;
 693         widget_class->state_changed = ev_view_state_changed;
 694         gtk_object_class->destroy = ev_view_destroy;
 695
 696         class->set_scroll_adjustments = ev_view_set_scroll_adjustments;
 697         class->scroll_view = ev_view_scroll_view;
 698
 699         widget_class->set_scroll_adjustments_signal =  g_signal_new ("set-scroll-adjustments",
 700                                                                      G_OBJECT_CLASS_TYPE (object_class),
 701                                                                      G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 702                                                                      G_STRUCT_OFFSET (EvViewClass, set_scroll_adjustments),
 703                                                                      NULL, NULL,
 704                                                                      ev_marshal_VOID__OBJECT_OBJECT,
 705                                                                      G_TYPE_NONE, 2,
 706                                                                      GTK_TYPE_ADJUSTMENT,
 707                                                                      GTK_TYPE_ADJUSTMENT);
 708         page_changed_signal = g_signal_new ("page-changed",
 709                                             G_OBJECT_CLASS_TYPE (object_class),
 710                                             G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 711                                             G_STRUCT_OFFSET (EvViewClass, page_changed),
 712                                             NULL, NULL,
 713                                             ev_marshal_VOID__NONE,
 714                                             G_TYPE_NONE, 0);
 715
 716         g_signal_new ("find-status-changed",
 717                       G_OBJECT_CLASS_TYPE (object_class),
 718                       G_SIGNAL_RUN_LAST,
 719                       0,
 720                       NULL, NULL,
 721                       ev_marshal_VOID__NONE,
 722                       G_TYPE_NONE, 0);
 723
 724         g_signal_new ("scroll_view",
 725                       G_TYPE_FROM_CLASS (object_class),
 726                       G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 727                       G_STRUCT_OFFSET (EvViewClass, scroll_view),
 728                       NULL, NULL,
 729                       ev_marshal_VOID__ENUM_BOOLEAN,
 730                       G_TYPE_NONE, 2,
 731                       GTK_TYPE_SCROLL_TYPE,
 732                       G_TYPE_BOOLEAN);
 733
 734         binding_set = gtk_binding_set_by_class (class);
 735
 736         add_scroll_binding (binding_set, GDK_Left,  GTK_SCROLL_STEP_BACKWARD, TRUE);
 737         add_scroll_binding (binding_set, GDK_Right, GTK_SCROLL_STEP_FORWARD,  TRUE);
 738         add_scroll_binding (binding_set, GDK_Up,    GTK_SCROLL_STEP_BACKWARD, FALSE);
 739         add_scroll_binding (binding_set, GDK_Down,  GTK_SCROLL_STEP_FORWARD,  FALSE);
 740
 741         add_scroll_binding (binding_set, GDK_Page_Up,   GTK_SCROLL_PAGE_BACKWARD, FALSE);
 742         add_scroll_binding (binding_set, GDK_Page_Down, GTK_SCROLL_PAGE_FORWARD,  FALSE);
 743 }
 744
 745 static void
 746 ev_view_init (EvView *view)
 747 {
 748         static const GdkColor white = { 0, 0xffff, 0xffff, 0xffff };
 749
 750         GTK_WIDGET_SET_FLAGS (view, GTK_CAN_FOCUS);
 751
 752         view->scale = 1.0;
 753
 754         gtk_widget_modify_bg (GTK_WIDGET (view), GTK_STATE_NORMAL, &white);
 755
 756         view->find_results = g_array_new (FALSE,
 757                                           FALSE,
 758                                           sizeof (EvFindResult));
 759         view->results_on_this_page = 0;
 760         view->next_page_with_result = 0;
 761 }
 762
 763 static void
 764 update_find_results (EvView *view)
 765 {
 766         const EvFindResult *results;
 767         int i;
 768         int on_this_page;
 769         int next_page_with_result;
 770         int earliest_page_with_result;
 771         int current_page;
 772         gboolean counts_changed;
 773
 774         results = (EvFindResult*) view->find_results->data;
 775         current_page = ev_document_get_page (view->document);
 776         next_page_with_result = 0;
 777         on_this_page = 0;
 778         earliest_page_with_result = 0;
 779
 780         i = 0;
 781         while (i < view->find_results->len) {
 782                 if (results[i].page_num == current_page) {
 783                         ++on_this_page;
 784                 } else {
 785                         int delta = results[i].page_num - current_page;
 786
 787                         if (delta > 0 && /* result on later page */
 788                             (next_page_with_result == 0 ||
 789                              results[i].page_num < next_page_with_result))
 790                                 next_page_with_result = results[i].page_num;
 791
 792                         if (delta < 0 && /* result on a previous page */
 793                             (earliest_page_with_result == 0 ||
 794                              results[i].page_num < earliest_page_with_result))
 795                                 earliest_page_with_result = results[i].page_num;
 796                 }
 797                 ++i;
 798         }
 799
 800         /* If earliest page is just the current page, there is no earliest page */
 801         if (earliest_page_with_result == current_page)
 802                 earliest_page_with_result = 0;
 803
 804         /* If no next page, then wrap and the wrapped page is the next page */
 805         if (next_page_with_result == 0)
 806                 next_page_with_result = earliest_page_with_result;
 807
 808         counts_changed = FALSE;
 809         if (on_this_page != view->results_on_this_page ||
 810             next_page_with_result != view->next_page_with_result) {
 811                 view->results_on_this_page = on_this_page;
 812                 view->next_page_with_result = next_page_with_result;
 813                 counts_changed = TRUE;
 814         }
 815
 816         /* If there are no results at all, then the
 817          * results of ev_view_get_find_status_message() will change
 818          * to reflect the percent_complete so we have to emit the signal
 819          */
 820         if (counts_changed ||
 821             view->find_results->len == 0) {
 822                 g_signal_emit_by_name (view,
 823                                        "find-status-changed");
 824         }
 825 }
 826
 827 static void
 828 found_results_callback (EvDocument         *document,
 829                         const EvFindResult *results,
 830                         int                 n_results,
 831                         double              percent_complete,
 832                         void               *data)
 833 {
 834   EvView *view = EV_VIEW (data);
 835
 836   g_array_set_size (view->find_results, 0);
 837
 838   if (n_results > 0)
 839           g_array_append_vals (view->find_results,
 840                                results, n_results);
 841
 842 #if 0
 843   {
 844           int i;
 845
 846           g_printerr ("%d results %d%%: ", n_results,
 847                       (int) (percent_complete * 100));
 848           i = 0;
 849           while (i < n_results) {
 850                   g_printerr ("%d ", results[i].page_num);
 851                   ++i;
 852           }
 853           g_printerr ("\n");
 854   }
 855 #endif
 856
 857   view->find_percent_complete = percent_complete;
 858   update_find_results (view);
 859
 860   gtk_widget_queue_draw (GTK_WIDGET (view));
 861 }
 862
 863 /*** Public API ***/
 864
 865 GtkWidget*
 866 ev_view_new (void)
 867 {
 868         return g_object_new (EV_TYPE_VIEW, NULL);
 869 }
 870
 871 static void
 872 document_changed_callback (EvDocument *document,
 873                            EvView     *view)
 874 {
 875         gtk_widget_queue_draw (GTK_WIDGET (view));
 876 }
 877
 878 void
 879 ev_view_set_document (EvView     *view,
 880                       EvDocument *document)
 881 {
 882         g_return_if_fail (EV_IS_VIEW (view));
 883
 884         if (document != view->document) {
 885                 int old_page = ev_view_get_page (view);
 886
 887                 if (view->document) {
 888                         g_signal_handlers_disconnect_by_func (view->document,
 889                                                               found_results_callback,
 890                                                               view);
 891                         g_array_set_size (view->find_results, 0);
 892                         view->results_on_this_page = 0;
 893                         view->next_page_with_result = 0;
 894
 895                         g_object_unref (view->document);
 896                 }
 897
 898                 view->document = document;
 899
 900                 if (view->document) {
 901                         g_object_ref (view->document);
 902                         if (EV_IS_DOCUMENT_FIND (view->document))
 903                                 g_signal_connect (view->document,
 904                                                   "found",
 905                                                   G_CALLBACK (found_results_callback),
 906                                                   view);
 907                         g_signal_connect (view->document,
 908                                           "changed",
 909                                           G_CALLBACK (document_changed_callback),
 910                                           view);
 911                 }
 912
 913                 if (GTK_WIDGET_REALIZED (view))
 914                         ev_document_set_target (view->document, view->bin_window);
 915
 916                 gtk_widget_queue_resize (GTK_WIDGET (view));
 917
 918                 if (old_page != ev_view_get_page (view))
 919                         g_signal_emit (view, page_changed_signal, 0);
 920         }
 921 }
 922
 923 static void
 924 set_document_page (EvView *view, int page)
 925 {
 926         if (view->document) {
 927                 int old_page = ev_document_get_page (view->document);
 928                 if (old_page != page)
 929                         ev_document_set_page (view->document, page);
 930                 if (old_page != ev_document_get_page (view->document)) {
 931                         g_signal_emit (view, page_changed_signal, 0);
 932
 933                         view->find_percent_complete = 0.0;
 934                         update_find_results (view);
 935                 }
 936         }
 937 }
 938
 939 static void
 940 go_to_link (EvView *view, EvLink *link)
 941 {
 942         EvLinkType type;
 943         const char *uri;
 944         int page;
 945
 946         type = ev_link_get_link_type (link);
 947
 948         switch (type) {
 949                 case EV_LINK_TYPE_TITLE:
 950                         break;
 951                 case EV_LINK_TYPE_PAGE:
 952                         page = ev_link_get_page (link);
 953                         set_document_page (view, page);
 954                         break;
 955                 case EV_LINK_TYPE_EXTERNAL_URI:
 956                         uri = ev_link_get_uri (link);
 957                         gnome_vfs_url_show (uri);
 958                         break;
 959         }
 960 }
 961
 962 void
 963 ev_view_go_to_link (EvView *view, EvLink *link)
 964 {
 965         EvLinkType type;
 966
 967         go_to_link (view, link);
 968
 969         type = ev_link_get_link_type (link);
 970         if (type == EV_LINK_TYPE_PAGE) {
 971                 ev_history_add_link (view->history, link);
 972         }
 973 }
 974
 975 static void
 976 go_to_index (EvView *view, int index)
 977 {
 978         EvLink *link;
 979
 980         link = ev_history_get_link_nth (view->history, index);
 981         g_return_if_fail (link != NULL);
 982
 983         go_to_link (view, link);
 984 }
 985
 986 void
 987 ev_view_go_back (EvView *view)
 988 {
 989         int index, n;
 990
 991         g_return_if_fail (EV_IS_HISTORY (view->history));
 992
 993         index = ev_history_get_current_index (view->history);
 994         n = ev_history_get_n_links (view->history);
 995
 996         if (n > 0) {
 997                 index = MAX (0, index - 1);
 998                 ev_history_set_current_index (view->history, index);
 999         }
1000 }
1001
1002 void
1003 ev_view_go_forward (EvView *view)
1004 {
1005         int index, n;
1006
1007         g_return_if_fail (EV_IS_HISTORY (view->history));
1008
1009         index = ev_history_get_current_index (view->history);
1010         n = ev_history_get_n_links (view->history);
1011
1012         if (n > 0) {
1013                 index = MIN (n - 1, index + 1);
1014                 ev_history_set_current_index (view->history, index);
1015         }
1016 }
1017
1018
1019 void
1020 ev_view_set_page (EvView *view,
1021                   int     page)
1022 {
1023         g_return_if_fail (EV_IS_VIEW (view));
1024         g_return_if_fail (EV_IS_HISTORY (view->history));
1025
1026         set_document_page (view, page);
1027         ev_history_add_page (view->history, page);
1028 }
1029
1030 int
1031 ev_view_get_page (EvView *view)
1032 {
1033         if (view->document)
1034                 return ev_document_get_page (view->document);
1035         else
1036                 return 1;
1037 }
1038
1039 #define ZOOM_IN_FACTOR  1.2
1040 #define ZOOM_OUT_FACTOR (1.0/ZOOM_IN_FACTOR)
1041
1042 #define MIN_SCALE 0.05409
1043 #define MAX_SCALE 18.4884
1044
1045 static void
1046 ev_view_zoom (EvView   *view,
1047               double    factor,
1048               gboolean  relative)
1049 {
1050         double scale;
1051
1052         if (relative)
1053                 scale = view->scale * factor;
1054         else
1055                 scale = factor;
1056
1057         view->scale = CLAMP (scale, MIN_SCALE, MAX_SCALE);
1058
1059         ev_document_set_scale (view->document, view->scale);
1060
1061         gtk_widget_queue_resize (GTK_WIDGET (view));
1062 }
1063
1064 void
1065 ev_view_zoom_in (EvView *view)
1066 {
1067         ev_view_zoom (view, ZOOM_IN_FACTOR, TRUE);
1068 }
1069
1070 void
1071 ev_view_zoom_out (EvView *view)
1072 {
1073         ev_view_zoom (view, ZOOM_OUT_FACTOR, TRUE);
1074 }
1075
1076 void
1077 ev_view_normal_size (EvView *view)
1078 {
1079         ev_view_zoom (view, 1.0, FALSE);
1080 }
1081
1082 void
1083 ev_view_best_fit (EvView *view)
1084 {
1085         double scale;
1086         int width, height;
1087
1088         width = height = 0;
1089         ev_document_get_page_size (view->document, &width, &height);
1090
1091         scale = 1.0;
1092         if (width != 0 && height != 0) {
1093                 double scale_w, scale_h;
1094
1095                 scale_w = (double)GTK_WIDGET (view)->allocation.width * view->scale / width;
1096                 scale_h = (double)GTK_WIDGET (view)->allocation.height * view->scale / height;
1097
1098                 scale = (scale_w < scale_h) ? scale_w : scale_h;
1099         }
1100
1101         ev_view_zoom (view, scale, FALSE);
1102 }
1103
1104 void
1105 ev_view_fit_width (EvView *view)
1106 {
1107         double scale = 1.0;
1108         int width;
1109
1110         width = 0;
1111         ev_document_get_page_size (view->document, &width, NULL);
1112
1113         scale = 1.0;
1114         if (width != 0)
1115                 scale = (double)GTK_WIDGET (view)->allocation.width * view->scale / width;
1116
1117         ev_view_zoom (view, scale, FALSE);
1118 }
1119
1120 char*
1121 ev_view_get_find_status_message (EvView *view)
1122 {
1123         if (view->find_results->len == 0) {
1124                 if (view->find_percent_complete >= (1.0 - 1e-10)) {
1125                         return g_strdup (_("Not found"));
1126                 } else {
1127                         return g_strdup_printf (_("%3d%% remaining to search"),
1128                                                 (int) ((1.0 - view->find_percent_complete) * 100));
1129                 }
1130         } else if (view->results_on_this_page == 0) {
1131                 g_assert (view->next_page_with_result != 0);
1132                 return g_strdup_printf (_("Found on page %d"),
1133                                         view->next_page_with_result);
1134         } else {
1135                 return g_strdup_printf (_("%d found on this page"),
1136                                         view->results_on_this_page);
1137         }
1138 }
1139
1140 static void
1141 history_index_changed_cb (EvHistory  *history,
1142                           GParamSpec *pspec,
1143                           EvView     *view)
1144 {
1145         int index;
1146
1147         index = ev_history_get_current_index (history);
1148         go_to_index (view, index);
1149 }
1150
1151 void
1152 ev_view_set_history (EvView     *view,
1153                      EvHistory  *history)
1154 {
1155         if (view->history) {
1156                 g_object_unref (view->history);
1157         }
1158
1159         view->history = g_object_ref (history);
1160         ev_history_add_page (view->history, ev_view_get_page (view));
1161
1162         g_signal_connect (view->history, "notify::index",
1163                           G_CALLBACK (history_index_changed_cb),
1164                           view);
1165 }