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
  32 #define EV_VIEW_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), EV_TYPE_VIEW, EvViewClass))
  33 #define EV_IS_VIEW_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), EV_TYPE_VIEW))
  34 #define EV_VIEW_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), EV_TYPE_VIEW, EvViewClass))
  35
  36 enum {
  37   TARGET_STRING,
  38   TARGET_TEXT,
  39   TARGET_COMPOUND_TEXT,
  40   TARGET_UTF8_STRING,
  41   TARGET_TEXT_BUFFER_CONTENTS
  42 };
  43
  44 static const GtkTargetEntry targets[] = {
  45         { "STRING", 0, TARGET_STRING },
  46         { "TEXT",   0, TARGET_TEXT },
  47         { "COMPOUND_TEXT", 0, TARGET_COMPOUND_TEXT },
  48         { "UTF8_STRING", 0, TARGET_UTF8_STRING },
  49 };
  50
  51 struct _EvView {
  52         GtkWidget parent_instance;
  53
  54         EvDocument *document;
  55
  56         GdkWindow *bin_window;
  57
  58         int scroll_x;
  59         int scroll_y;
  60
  61         gboolean has_selection;
  62         GdkRectangle selection;
  63
  64         GtkAdjustment *hadjustment;
  65         GtkAdjustment *vadjustment;
  66
  67         GArray *find_results;
  68         int results_on_this_page;
  69         int next_page_with_result;
  70         double find_percent_complete;
  71
  72         double scale;
  73 };
  74
  75 struct _EvViewClass {
  76         GtkWidgetClass parent_class;
  77
  78         void    (*set_scroll_adjustments) (EvView         *view,
  79                                            GtkAdjustment  *hadjustment,
  80                                            GtkAdjustment  *vadjustment);
  81         void    (*scroll_view)            (EvView         *view,
  82                                            GtkScrollType   scroll,
  83                                            gboolean        horizontal);
  84
  85         /* Should this be notify::page? */
  86         void    (*page_changed)           (EvView         *view);
  87 };
  88
  89 static guint page_changed_signal = 0;
  90
  91 static void ev_view_set_scroll_adjustments (EvView         *view,
  92                                             GtkAdjustment  *hadjustment,
  93                                             GtkAdjustment  *vadjustment);
  94
  95 G_DEFINE_TYPE (EvView, ev_view, GTK_TYPE_WIDGET)
  96
  97 /*** Helper functions ***/
  98
  99 static void
 100 view_update_adjustments (EvView *view)
 101 {
 102         int old_x = view->scroll_x;
 103         int old_y = view->scroll_y;
 104
 105         if (view->hadjustment)
 106                 view->scroll_x = view->hadjustment->value;
 107         else
 108                 view->scroll_x = 0;
 109
 110         if (view->vadjustment)
 111                 view->scroll_y = view->vadjustment->value;
 112         else
 113                 view->scroll_y = 0;
 114
 115         if (GTK_WIDGET_REALIZED (view) &&
 116             (view->scroll_x != old_x || view->scroll_y != old_y)) {
 117                 gdk_window_move (view->bin_window, - view->scroll_x, - view->scroll_y);
 118                 gdk_window_process_updates (view->bin_window, TRUE);
 119         }
 120 }
 121
 122 static void
 123 view_set_adjustment_values (EvView         *view,
 124                             GtkOrientation  orientation)
 125 {
 126         GtkWidget *widget = GTK_WIDGET (view);
 127         GtkAdjustment *adjustment;
 128         gboolean value_changed = FALSE;
 129         int requisition;
 130         int allocation;
 131
 132         if (orientation == GTK_ORIENTATION_HORIZONTAL)  {
 133                 requisition = widget->requisition.width;
 134                 allocation = widget->allocation.width;
 135                 adjustment = view->hadjustment;
 136         } else {
 137                 requisition = widget->requisition.height;
 138                 allocation = widget->allocation.height;
 139                 adjustment = view->vadjustment;
 140         }
 141
 142         if (!adjustment)
 143                 return;
 144
 145         adjustment->page_size = allocation;
 146         adjustment->step_increment = allocation * 0.1;
 147         adjustment->page_increment = allocation * 0.9;
 148         adjustment->lower = 0;
 149         adjustment->upper = MAX (allocation, requisition);
 150
 151         if (adjustment->value > adjustment->upper - adjustment->page_size) {
 152                 adjustment->value = adjustment->upper - adjustment->page_size;
 153                 value_changed = TRUE;
 154         }
 155
 156         gtk_adjustment_changed (adjustment);
 157         if (value_changed)
 158                 gtk_adjustment_value_changed (adjustment);
 159 }
 160
 161 /*** Virtual function implementations ***/
 162
 163 static void
 164 ev_view_finalize (GObject *object)
 165 {
 166         EvView *view = EV_VIEW (object);
 167
 168         if (view->document)
 169                 g_object_unref (view->document);
 170
 171         ev_view_set_scroll_adjustments (view, NULL, NULL);
 172
 173         g_array_free (view->find_results, TRUE);
 174         view->find_results = NULL;
 175
 176         G_OBJECT_CLASS (ev_view_parent_class)->finalize (object);
 177 }
 178
 179 static void
 180 ev_view_destroy (GtkObject *object)
 181 {
 182         EvView *view = EV_VIEW (object);
 183
 184         ev_view_set_scroll_adjustments (view, NULL, NULL);
 185
 186         GTK_OBJECT_CLASS (ev_view_parent_class)->destroy (object);
 187 }
 188
 189 static void
 190 ev_view_size_request (GtkWidget      *widget,
 191                       GtkRequisition *requisition)
 192 {
 193         EvView *view = EV_VIEW (widget);
 194
 195         if (GTK_WIDGET_REALIZED (widget)) {
 196                 if (view->document) {
 197                         ev_document_get_page_size (view->document,
 198                                                    &requisition->width,
 199                                                    &requisition->height);
 200                 } else {
 201                         requisition->width = 10;
 202                         requisition->height = 10;
 203                 }
 204         }
 205
 206 }
 207
 208 static void
 209 ev_view_size_allocate (GtkWidget      *widget,
 210                        GtkAllocation  *allocation)
 211 {
 212         EvView *view = EV_VIEW (widget);
 213
 214         GTK_WIDGET_CLASS (ev_view_parent_class)->size_allocate (widget, allocation);
 215
 216         view_set_adjustment_values (view, GTK_ORIENTATION_HORIZONTAL);
 217         view_set_adjustment_values (view, GTK_ORIENTATION_VERTICAL);
 218
 219         if (GTK_WIDGET_REALIZED (widget)) {
 220                 gdk_window_resize (view->bin_window,
 221                                    MAX (widget->allocation.width, widget->requisition.width),
 222                                    MAX (widget->allocation.height, widget->requisition.height));
 223         }
 224 }
 225
 226 static void
 227 update_window_backgrounds (EvView *view)
 228 {
 229         GtkWidget *widget = GTK_WIDGET (view);
 230
 231         if (GTK_WIDGET_REALIZED (view)) {
 232                 gdk_window_set_background (view->bin_window,
 233                                            &widget->style->base[GTK_WIDGET_STATE (widget)]);
 234         }
 235 }
 236
 237 static void
 238 ev_view_realize (GtkWidget *widget)
 239 {
 240         EvView *view = EV_VIEW (widget);
 241         GdkWindowAttr attributes;
 242
 243         GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 244
 245         attributes.window_type = GDK_WINDOW_CHILD;
 246         attributes.wclass = GDK_INPUT_OUTPUT;
 247         attributes.visual = gtk_widget_get_visual (widget);
 248         attributes.colormap = gtk_widget_get_colormap (widget);
 249
 250         attributes.x = widget->allocation.x;
 251         attributes.y = widget->allocation.y;
 252         attributes.width = widget->allocation.width;
 253         attributes.height = widget->allocation.height;
 254         attributes.event_mask = 0;
 255
 256         widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
 257                                          &attributes,
 258                                          GDK_WA_X | GDK_WA_Y |
 259                                          GDK_WA_COLORMAP |
 260                                          GDK_WA_VISUAL);
 261         gdk_window_set_user_data (widget->window, widget);
 262         widget->style = gtk_style_attach (widget->style, widget->window);
 263
 264         attributes.x = 0;
 265         attributes.y = 0;
 266         attributes.width = MAX (widget->allocation.width, widget->requisition.width);
 267         attributes.height = MAX (widget->allocation.height, widget->requisition.height);
 268         attributes.event_mask = GDK_EXPOSURE_MASK |
 269                                 GDK_BUTTON_PRESS_MASK |
 270                                 GDK_BUTTON_RELEASE_MASK |
 271                                 GDK_SCROLL_MASK |
 272                                 GDK_KEY_PRESS_MASK |
 273                                 GDK_BUTTON1_MOTION_MASK;
 274
 275         view->bin_window = gdk_window_new (widget->window,
 276                                            &attributes,
 277                                            GDK_WA_X | GDK_WA_Y |
 278                                            GDK_WA_COLORMAP |
 279                                            GDK_WA_VISUAL);
 280         gdk_window_set_user_data (view->bin_window, widget);
 281         gdk_window_show (view->bin_window);
 282
 283         if (view->document) {
 284                 ev_document_set_target (view->document, view->bin_window);
 285
 286                 /* We can't get page size without a target, so we have to
 287                  * queue a size request at realization. Could be fixed
 288                  * with EvDocument changes to allow setting a GdkScreen
 289                  * without setting a target.
 290                  */
 291                 gtk_widget_queue_resize (widget);
 292         }
 293
 294         update_window_backgrounds (view);
 295 }
 296
 297 static void
 298 ev_view_unrealize (GtkWidget *widget)
 299 {
 300         EvView *view = EV_VIEW (widget);
 301
 302         if (view->document)
 303                 ev_document_set_target (view->document, NULL);
 304
 305         gdk_window_set_user_data (view->bin_window, NULL);
 306         gdk_window_destroy (view->bin_window);
 307         view->bin_window = NULL;
 308
 309         GTK_WIDGET_CLASS (ev_view_parent_class)->unrealize (widget);
 310 }
 311
 312 static void
 313 ev_view_style_set (GtkWidget      *widget,
 314                    GtkStyle       *previous_style)
 315 {
 316         update_window_backgrounds (EV_VIEW (widget));
 317 }
 318
 319 static void
 320 ev_view_state_changed (GtkWidget    *widget,
 321                        GtkStateType  previous_state)
 322 {
 323         update_window_backgrounds (EV_VIEW (widget));
 324 }
 325
 326 static guint32
 327 ev_gdk_color_to_rgb (const GdkColor *color)
 328 {
 329   guint32 result;
 330   result = (0xff0000 | (color->red & 0xff00));
 331   result <<= 8;
 332   result |= ((color->green & 0xff00) | (color->blue >> 8));
 333   return result;
 334 }
 335
 336 static void
 337 draw_rubberband (GtkWidget *widget, GdkWindow *window, const GdkRectangle *rect)
 338 {
 339         GdkGC *gc;
 340         GdkPixbuf *pixbuf;
 341         GdkColor *fill_color_gdk;
 342         guint fill_color;
 343
 344         fill_color_gdk = gdk_color_copy (&GTK_WIDGET (widget)->style->base[GTK_STATE_SELECTED]);
 345         fill_color = ev_gdk_color_to_rgb (fill_color_gdk) << 8 | 0x40;
 346
 347         pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8,
 348                                  rect->width, rect->height);
 349         gdk_pixbuf_fill (pixbuf, fill_color);
 350
 351         gdk_draw_pixbuf (window, NULL, pixbuf,
 352                          0, 0,
 353                          rect->x,rect->y,
 354                          rect->width, rect->height,
 355                          GDK_RGB_DITHER_NONE,
 356                          0, 0);
 357
 358         g_object_unref (pixbuf);
 359
 360         gc = gdk_gc_new (window);
 361         gdk_gc_set_rgb_fg_color (gc, fill_color_gdk);
 362         gdk_draw_rectangle (window, gc, FALSE,
 363                             rect->x, rect->y,
 364                             rect->width - 1,
 365                             rect->height - 1);
 366         g_object_unref (gc);
 367
 368         gdk_color_free (fill_color_gdk);
 369 }
 370
 371 static void
 372 expose_bin_window (GtkWidget      *widget,
 373                    GdkEventExpose *event)
 374 {
 375         EvView *view = EV_VIEW (widget);
 376         int i;
 377         int current_page;
 378         const EvFindResult *results;
 379
 380         if (view->document == NULL)
 381                 return;
 382
 383         ev_document_render (view->document,
 384                             event->area.x, event->area.y,
 385                             event->area.width, event->area.height);
 386
 387         results = (EvFindResult*) view->find_results->data;
 388         current_page = ev_document_get_page (view->document);
 389         i = 0;
 390         while (i < view->find_results->len) {
 391 #if 0
 392                 g_printerr ("highlighting result %d page %d at %d,%d %dx%d\n",
 393                             i, results[i].page_num,
 394                             results[i].highlight_area.x,
 395                             results[i].highlight_area.y,
 396                             results[i].highlight_area.width,
 397                             results[i].highlight_area.height);
 398 #endif
 399                 if (results[i].page_num == current_page)
 400                         draw_rubberband (widget, view->bin_window,
 401                                          &results[i].highlight_area);
 402                 ++i;
 403         }
 404
 405         if (view->has_selection) {
 406                 draw_rubberband (widget, view->bin_window, &view->selection);
 407         }
 408 }
 409
 410 static gboolean
 411 ev_view_expose_event (GtkWidget      *widget,
 412                       GdkEventExpose *event)
 413 {
 414         EvView *view = EV_VIEW (widget);
 415
 416         if (event->window == view->bin_window)
 417                 expose_bin_window (widget, event);
 418         else
 419                 return GTK_WIDGET_CLASS (ev_view_parent_class)->expose_event (widget, event);
 420
 421         return FALSE;
 422 }
 423
 424 void
 425 ev_view_select_all (EvView *ev_view)
 426 {
 427         GtkWidget *widget = GTK_WIDGET (ev_view);
 428
 429         g_return_if_fail (EV_IS_VIEW (ev_view));
 430
 431         ev_view->has_selection = TRUE;
 432         ev_view->selection.x = ev_view->selection.y = 0;
 433         ev_view->selection.width = widget->requisition.width;
 434         ev_view->selection.height = widget->requisition.height;
 435
 436         gtk_widget_queue_draw (widget);
 437 }
 438
 439 void
 440 ev_view_copy (EvView *ev_view)
 441 {
 442         GtkClipboard *clipboard;
 443         char *text;
 444
 445         text = ev_document_get_text (ev_view->document, &ev_view->selection);
 446         clipboard = gtk_widget_get_clipboard (GTK_WIDGET (ev_view),
 447                                               GDK_SELECTION_CLIPBOARD);
 448         gtk_clipboard_set_text (clipboard, text, -1);
 449         g_free (text);
 450 }
 451
 452 static void
 453 ev_view_primary_get_cb (GtkClipboard     *clipboard,
 454                         GtkSelectionData *selection_data,
 455                         guint             info,
 456                         gpointer          data)
 457 {
 458         EvView *ev_view = EV_VIEW (data);
 459         char *text;
 460
 461         text = ev_document_get_text (ev_view->document, &ev_view->selection);
 462         gtk_selection_data_set_text (selection_data, text, -1);
 463 }
 464
 465 static void
 466 ev_view_primary_clear_cb (GtkClipboard *clipboard,
 467                           gpointer      data)
 468 {
 469         EvView *ev_view = EV_VIEW (data);
 470
 471         ev_view->has_selection = FALSE;
 472 }
 473
 474 static void
 475 ev_view_update_primary_selection (EvView *ev_view)
 476 {
 477         GtkClipboard *clipboard;
 478
 479         clipboard = gtk_widget_get_clipboard (GTK_WIDGET (ev_view),
 480                                               GDK_SELECTION_PRIMARY);
 481
 482         if (ev_view->has_selection) {
 483                 if (!gtk_clipboard_set_with_owner (clipboard,
 484                                                    targets,
 485                                                    G_N_ELEMENTS (targets),
 486                                                    ev_view_primary_get_cb,
 487                                                    ev_view_primary_clear_cb,
 488                                                    G_OBJECT (ev_view)))
 489                         ev_view_primary_clear_cb (clipboard, ev_view);
 490         } else {
 491                 if (gtk_clipboard_get_owner (clipboard) == G_OBJECT (ev_view))
 492                         gtk_clipboard_clear (clipboard);
 493         }
 494 }
 495
 496 static gboolean
 497 ev_view_button_press_event (GtkWidget      *widget,
 498                             GdkEventButton *event)
 499 {
 500         EvView *view = EV_VIEW (widget);
 501
 502         if (!GTK_WIDGET_HAS_FOCUS (widget)) {
 503                 gtk_widget_grab_focus (widget);
 504         }
 505
 506         switch (event->button) {
 507                 case 1:
 508                         if (view->has_selection) {
 509                                 view->has_selection = FALSE;
 510                                 gtk_widget_queue_draw (widget);
 511                         }
 512
 513                         view->selection.x = event->x;
 514                         view->selection.y = event->y;
 515                         view->selection.width = 0;
 516                         view->selection.height = 0;
 517                         break;
 518         }
 519
 520         return TRUE;
 521 }
 522
 523 static gboolean
 524 ev_view_motion_notify_event (GtkWidget      *widget,
 525                              GdkEventMotion *event)
 526 {
 527         EvView *view = EV_VIEW (widget);
 528
 529         view->has_selection = TRUE;
 530         view->selection.x = MIN (view->selection.x, event->x);
 531         view->selection.y = MIN (view->selection.y, event->y);
 532         view->selection.width = ABS (view->selection.x - event->x) + 1;
 533         view->selection.height = ABS (view->selection.y - event->y) + 1;
 534
 535         gtk_widget_queue_draw (widget);
 536
 537         return TRUE;
 538 }
 539
 540 static gboolean
 541 ev_view_button_release_event (GtkWidget      *widget,
 542                               GdkEventButton *event)
 543 {
 544         EvView *view = EV_VIEW (widget);
 545
 546         ev_view_update_primary_selection (view);
 547
 548         return FALSE;
 549 }
 550
 551 static void
 552 on_adjustment_value_changed (GtkAdjustment  *adjustment,
 553                              EvView *view)
 554 {
 555         view_update_adjustments (view);
 556 }
 557
 558 static void
 559 set_scroll_adjustment (EvView *view,
 560                        GtkOrientation  orientation,
 561                        GtkAdjustment  *adjustment)
 562 {
 563         GtkAdjustment **to_set;
 564
 565         if (orientation == GTK_ORIENTATION_HORIZONTAL)
 566                 to_set = &view->hadjustment;
 567         else
 568                 to_set = &view->vadjustment;
 569
 570         if (*to_set != adjustment) {
 571                 if (*to_set) {
 572                         g_signal_handlers_disconnect_by_func (*to_set,
 573                                                               (gpointer) on_adjustment_value_changed,
 574                                                               view);
 575                         g_object_unref (*to_set);
 576                 }
 577
 578                 *to_set = adjustment;
 579                 view_set_adjustment_values (view, orientation);
 580
 581                 if (*to_set) {
 582                         g_object_ref (*to_set);
 583                         g_signal_connect (*to_set, "value_changed",
 584                                           G_CALLBACK (on_adjustment_value_changed), view);
 585                 }
 586         }
 587 }
 588
 589 static void
 590 ev_view_set_scroll_adjustments (EvView *view,
 591                                 GtkAdjustment  *hadjustment,
 592                                 GtkAdjustment  *vadjustment)
 593 {
 594         set_scroll_adjustment (view, GTK_ORIENTATION_HORIZONTAL, hadjustment);
 595         set_scroll_adjustment (view, GTK_ORIENTATION_VERTICAL, vadjustment);
 596
 597         view_update_adjustments (view);
 598 }
 599
 600 static void
 601 add_scroll_binding (GtkBindingSet  *binding_set,
 602                     guint           keyval,
 603                     GtkScrollType   scroll,
 604                     gboolean        horizontal)
 605 {
 606   guint keypad_keyval = keyval - GDK_Left + GDK_KP_Left;
 607
 608   gtk_binding_entry_add_signal (binding_set, keyval, 0,
 609                                 "scroll_view", 2,
 610                                 GTK_TYPE_SCROLL_TYPE, scroll,
 611                                 G_TYPE_BOOLEAN, horizontal);
 612   gtk_binding_entry_add_signal (binding_set, keypad_keyval, 0,
 613                                 "scroll_view", 2,
 614                                 GTK_TYPE_SCROLL_TYPE, scroll,
 615                                 G_TYPE_BOOLEAN, horizontal);
 616 }
 617
 618 static void
 619 ev_view_scroll_view (EvView *view,
 620                      GtkScrollType scroll,
 621                      gboolean horizontal)
 622 {
 623         if (scroll == GTK_SCROLL_PAGE_BACKWARD) {
 624                 ev_view_set_page (view, ev_view_get_page (view) - 1);
 625         } else if (scroll == GTK_SCROLL_PAGE_FORWARD) {
 626                 ev_view_set_page (view, ev_view_get_page (view) + 1);
 627         } else {
 628                 GtkAdjustment *adjustment;
 629                 double value;
 630
 631                 if (horizontal) {
 632                         adjustment = view->hadjustment;
 633                 } else {
 634                         adjustment = view->vadjustment;
 635                 }
 636
 637                 value = adjustment->value;
 638
 639                 switch (scroll) {
 640                         case GTK_SCROLL_STEP_BACKWARD:
 641                                 value -= adjustment->step_increment;
 642                                 break;
 643                         case GTK_SCROLL_STEP_FORWARD:
 644                                 value += adjustment->step_increment;
 645                                 break;
 646                         default:
 647                                 break;
 648                 }
 649
 650                 value = CLAMP (value, adjustment->lower,
 651                                adjustment->upper - adjustment->page_size);
 652
 653                 gtk_adjustment_set_value (adjustment, value);
 654         }
 655 }
 656
 657 static void
 658 ev_view_class_init (EvViewClass *class)
 659 {
 660         GObjectClass *object_class = G_OBJECT_CLASS (class);
 661         GtkObjectClass *gtk_object_class = GTK_OBJECT_CLASS (class);
 662         GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
 663         GtkBindingSet *binding_set;
 664
 665         object_class->finalize = ev_view_finalize;
 666
 667         widget_class->expose_event = ev_view_expose_event;
 668         widget_class->button_press_event = ev_view_button_press_event;
 669         widget_class->motion_notify_event = ev_view_motion_notify_event;
 670         widget_class->button_release_event = ev_view_button_release_event;
 671         widget_class->size_request = ev_view_size_request;
 672         widget_class->size_allocate = ev_view_size_allocate;
 673         widget_class->realize = ev_view_realize;
 674         widget_class->unrealize = ev_view_unrealize;
 675         widget_class->style_set = ev_view_style_set;
 676         widget_class->state_changed = ev_view_state_changed;
 677         gtk_object_class->destroy = ev_view_destroy;
 678
 679         class->set_scroll_adjustments = ev_view_set_scroll_adjustments;
 680         class->scroll_view = ev_view_scroll_view;
 681
 682         widget_class->set_scroll_adjustments_signal =  g_signal_new ("set-scroll-adjustments",
 683                                                                      G_OBJECT_CLASS_TYPE (object_class),
 684                                                                      G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 685                                                                      G_STRUCT_OFFSET (EvViewClass, set_scroll_adjustments),
 686                                                                      NULL, NULL,
 687                                                                      ev_marshal_VOID__OBJECT_OBJECT,
 688                                                                      G_TYPE_NONE, 2,
 689                                                                      GTK_TYPE_ADJUSTMENT,
 690                                                                      GTK_TYPE_ADJUSTMENT);
 691         page_changed_signal = g_signal_new ("page-changed",
 692                                             G_OBJECT_CLASS_TYPE (object_class),
 693                                             G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 694                                             G_STRUCT_OFFSET (EvViewClass, page_changed),
 695                                             NULL, NULL,
 696                                             ev_marshal_VOID__NONE,
 697                                             G_TYPE_NONE, 0);
 698
 699         g_signal_new ("find-status-changed",
 700                       G_OBJECT_CLASS_TYPE (object_class),
 701                       G_SIGNAL_RUN_LAST,
 702                       0,
 703                       NULL, NULL,
 704                       ev_marshal_VOID__NONE,
 705                       G_TYPE_NONE, 0);
 706
 707         g_signal_new ("scroll_view",
 708                       G_TYPE_FROM_CLASS (object_class),
 709                       G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 710                       G_STRUCT_OFFSET (EvViewClass, scroll_view),
 711                       NULL, NULL,
 712                       ev_marshal_VOID__ENUM_BOOLEAN,
 713                       G_TYPE_NONE, 2,
 714                       GTK_TYPE_SCROLL_TYPE,
 715                       G_TYPE_BOOLEAN);
 716
 717         binding_set = gtk_binding_set_by_class (class);
 718
 719         add_scroll_binding (binding_set, GDK_Left,  GTK_SCROLL_STEP_BACKWARD, TRUE);
 720         add_scroll_binding (binding_set, GDK_Right, GTK_SCROLL_STEP_FORWARD,  TRUE);
 721         add_scroll_binding (binding_set, GDK_Up,    GTK_SCROLL_STEP_BACKWARD, FALSE);
 722         add_scroll_binding (binding_set, GDK_Down,  GTK_SCROLL_STEP_FORWARD,  FALSE);
 723
 724         add_scroll_binding (binding_set, GDK_Page_Up,   GTK_SCROLL_PAGE_BACKWARD, FALSE);
 725         add_scroll_binding (binding_set, GDK_Page_Down, GTK_SCROLL_PAGE_FORWARD,  FALSE);
 726 }
 727
 728 static void
 729 ev_view_init (EvView *view)
 730 {
 731         static const GdkColor white = { 0, 0xffff, 0xffff, 0xffff };
 732
 733         GTK_WIDGET_SET_FLAGS (view, GTK_CAN_FOCUS);
 734
 735         view->scale = 1.0;
 736
 737         gtk_widget_modify_bg (GTK_WIDGET (view), GTK_STATE_NORMAL, &white);
 738
 739         view->find_results = g_array_new (FALSE,
 740                                           FALSE,
 741                                           sizeof (EvFindResult));
 742         view->results_on_this_page = 0;
 743         view->next_page_with_result = 0;
 744 }
 745
 746 static void
 747 update_find_results (EvView *view)
 748 {
 749         const EvFindResult *results;
 750         int i;
 751         int on_this_page;
 752         int next_page_with_result;
 753         int earliest_page_with_result;
 754         int current_page;
 755         gboolean counts_changed;
 756
 757         results = (EvFindResult*) view->find_results->data;
 758         current_page = ev_document_get_page (view->document);
 759         next_page_with_result = 0;
 760         on_this_page = 0;
 761         earliest_page_with_result = 0;
 762
 763         i = 0;
 764         while (i < view->find_results->len) {
 765                 if (results[i].page_num == current_page) {
 766                         ++on_this_page;
 767                 } else {
 768                         int delta = results[i].page_num - current_page;
 769
 770                         if (delta > 0 && /* result on later page */
 771                             (next_page_with_result == 0 ||
 772                              results[i].page_num < next_page_with_result))
 773                                 next_page_with_result = results[i].page_num;
 774
 775                         if (delta < 0 && /* result on a previous page */
 776                             (earliest_page_with_result == 0 ||
 777                              results[i].page_num < earliest_page_with_result))
 778                                 earliest_page_with_result = results[i].page_num;
 779                 }
 780                 ++i;
 781         }
 782
 783         /* If earliest page is just the current page, there is no earliest page */
 784         if (earliest_page_with_result == current_page)
 785                 earliest_page_with_result = 0;
 786
 787         /* If no next page, then wrap and the wrapped page is the next page */
 788         if (next_page_with_result == 0)
 789                 next_page_with_result = earliest_page_with_result;
 790
 791         counts_changed = FALSE;
 792         if (on_this_page != view->results_on_this_page ||
 793             next_page_with_result != view->next_page_with_result) {
 794                 view->results_on_this_page = on_this_page;
 795                 view->next_page_with_result = next_page_with_result;
 796                 counts_changed = TRUE;
 797         }
 798
 799         /* If there are no results at all, then the
 800          * results of ev_view_get_find_status_message() will change
 801          * to reflect the percent_complete so we have to emit the signal
 802          */
 803         if (counts_changed ||
 804             view->find_results->len == 0) {
 805                 g_signal_emit_by_name (view,
 806                                        "find-status-changed");
 807         }
 808 }
 809
 810 static void
 811 found_results_callback (EvDocument         *document,
 812                         const EvFindResult *results,
 813                         int                 n_results,
 814                         double              percent_complete,
 815                         void               *data)
 816 {
 817   EvView *view = EV_VIEW (data);
 818
 819   g_array_set_size (view->find_results, 0);
 820
 821   if (n_results > 0)
 822           g_array_append_vals (view->find_results,
 823                                results, n_results);
 824
 825 #if 0
 826   {
 827           int i;
 828
 829           g_printerr ("%d results %d%%: ", n_results,
 830                       (int) (percent_complete * 100));
 831           i = 0;
 832           while (i < n_results) {
 833                   g_printerr ("%d ", results[i].page_num);
 834                   ++i;
 835           }
 836           g_printerr ("\n");
 837   }
 838 #endif
 839
 840   view->find_percent_complete = percent_complete;
 841   update_find_results (view);
 842
 843   gtk_widget_queue_draw (GTK_WIDGET (view));
 844 }
 845
 846 /*** Public API ***/
 847
 848 GtkWidget*
 849 ev_view_new (void)
 850 {
 851         return g_object_new (EV_TYPE_VIEW, NULL);
 852 }
 853
 854 static void
 855 document_changed_callback (EvDocument *document,
 856                            EvView     *view)
 857 {
 858         gtk_widget_queue_draw (GTK_WIDGET (view));
 859 }
 860
 861 void
 862 ev_view_set_document (EvView     *view,
 863                       EvDocument *document)
 864 {
 865         g_return_if_fail (EV_IS_VIEW (view));
 866
 867         if (document != view->document) {
 868                 int old_page = ev_view_get_page (view);
 869
 870                 if (view->document) {
 871                         g_signal_handlers_disconnect_by_func (view->document,
 872                                                               found_results_callback,
 873                                                               view);
 874                         g_array_set_size (view->find_results, 0);
 875                         view->results_on_this_page = 0;
 876                         view->next_page_with_result = 0;
 877
 878                         g_object_unref (view->document);
 879                 }
 880
 881                 view->document = document;
 882
 883                 if (view->document) {
 884                         g_object_ref (view->document);
 885                         if (EV_IS_DOCUMENT_FIND (view->document))
 886                                 g_signal_connect (view->document,
 887                                                   "found",
 888                                                   G_CALLBACK (found_results_callback),
 889                                                   view);
 890                         g_signal_connect (view->document,
 891                                           "changed",
 892                                           G_CALLBACK (document_changed_callback),
 893                                           view);
 894                 }
 895
 896                 if (GTK_WIDGET_REALIZED (view))
 897                         ev_document_set_target (view->document, view->bin_window);
 898
 899                 gtk_widget_queue_resize (GTK_WIDGET (view));
 900
 901                 if (old_page != ev_view_get_page (view))
 902                         g_signal_emit (view, page_changed_signal, 0);
 903         }
 904 }
 905
 906 void
 907 ev_view_set_page (EvView *view,
 908                   int     page)
 909 {
 910         if (view->document) {
 911                 int old_page = ev_document_get_page (view->document);
 912                 if (old_page != page)
 913                         ev_document_set_page (view->document, page);
 914                 if (old_page != ev_document_get_page (view->document)) {
 915                         g_signal_emit (view, page_changed_signal, 0);
 916
 917                         view->find_percent_complete = 0.0;
 918                         update_find_results (view);
 919                 }
 920         }
 921 }
 922
 923 int
 924 ev_view_get_page (EvView *view)
 925 {
 926         if (view->document)
 927                 return ev_document_get_page (view->document);
 928         else
 929                 return 1;
 930 }
 931
 932 #define ZOOM_IN_FACTOR  1.2
 933 #define ZOOM_OUT_FACTOR (1.0/ZOOM_IN_FACTOR)
 934
 935 #define MIN_SCALE 0.05409
 936 #define MAX_SCALE 18.4884
 937
 938 static void
 939 ev_view_zoom (EvView   *view,
 940               double    factor,
 941               gboolean  relative)
 942 {
 943         double scale;
 944
 945         if (relative)
 946                 scale = view->scale * factor;
 947         else
 948                 scale = factor;
 949
 950         view->scale = CLAMP (scale, MIN_SCALE, MAX_SCALE);
 951
 952         ev_document_set_scale (view->document, view->scale);
 953
 954         gtk_widget_queue_resize (GTK_WIDGET (view));
 955 }
 956
 957 void
 958 ev_view_zoom_in (EvView *view)
 959 {
 960         ev_view_zoom (view, ZOOM_IN_FACTOR, TRUE);
 961 }
 962
 963 void
 964 ev_view_zoom_out (EvView *view)
 965 {
 966         ev_view_zoom (view, ZOOM_OUT_FACTOR, TRUE);
 967 }
 968
 969 void
 970 ev_view_normal_size (EvView *view)
 971 {
 972         ev_view_zoom (view, 1.0, FALSE);
 973 }
 974
 975 void
 976 ev_view_best_fit (EvView *view)
 977 {
 978         double scale;
 979         int width, height;
 980
 981         width = height = 0;
 982         ev_document_get_page_size (view->document, &width, &height);
 983
 984         scale = 1.0;
 985         if (width != 0 && height != 0) {
 986                 double scale_w, scale_h;
 987
 988                 scale_w = (double)GTK_WIDGET (view)->allocation.width * view->scale / width;
 989                 scale_h = (double)GTK_WIDGET (view)->allocation.height * view->scale / height;
 990
 991                 scale = (scale_w < scale_h) ? scale_w : scale_h;
 992         }
 993
 994         ev_view_zoom (view, scale, FALSE);
 995 }
 996
 997 void
 998 ev_view_fit_width (EvView *view)
 999 {
1000         double scale = 1.0;
1001         int width;
1002
1003         width = 0;
1004         ev_document_get_page_size (view->document, &width, NULL);
1005
1006         scale = 1.0;
1007         if (width != 0)
1008                 scale = (double)GTK_WIDGET (view)->allocation.width * view->scale / width;
1009
1010         ev_view_zoom (view, scale, FALSE);
1011 }
1012
1013 char*
1014 ev_view_get_find_status_message (EvView *view)
1015 {
1016         if (view->find_results->len == 0) {
1017                 if (view->find_percent_complete >= (1.0 - 1e-10)) {
1018                         return g_strdup (_("Not found"));
1019                 } else {
1020                         return g_strdup_printf (_("%3d%% remaining to search"),
1021                                                 (int) ((1.0 - view->find_percent_complete) * 100));
1022                 }
1023         } else if (view->results_on_this_page == 0) {
1024                 g_assert (view->next_page_with_result != 0);
1025                 return g_strdup_printf (_("Found on page %d"),
1026                                         view->next_page_with_result);
1027         } else {
1028                 return g_strdup_printf (_("%d found on this page"),
1029                                         view->results_on_this_page);
1030         }
1031 }