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         EvHistory  *history;
  56
  57         GdkWindow *bin_window;
  58
  59         int scroll_x;
  60         int scroll_y;
  61
  62         gboolean has_selection;
  63         GdkRectangle selection;
  64
  65         GtkAdjustment *hadjustment;
  66         GtkAdjustment *vadjustment;
  67
  68         GArray *find_results;
  69         int results_on_this_page;
  70         int next_page_with_result;
  71         double find_percent_complete;
  72
  73         double scale;
  74 };
  75
  76 struct _EvViewClass {
  77         GtkWidgetClass parent_class;
  78
  79         void    (*set_scroll_adjustments) (EvView         *view,
  80                                            GtkAdjustment  *hadjustment,
  81                                            GtkAdjustment  *vadjustment);
  82         void    (*scroll_view)            (EvView         *view,
  83                                            GtkScrollType   scroll,
  84                                            gboolean        horizontal);
  85
  86         /* Should this be notify::page? */
  87         void    (*page_changed)           (EvView         *view);
  88 };
  89
  90 static guint page_changed_signal = 0;
  91
  92 static void ev_view_set_scroll_adjustments (EvView         *view,
  93                                             GtkAdjustment  *hadjustment,
  94                                             GtkAdjustment  *vadjustment);
  95
  96 G_DEFINE_TYPE (EvView, ev_view, GTK_TYPE_WIDGET)
  97
  98 /*** Helper functions ***/
  99
 100 static void
 101 view_update_adjustments (EvView *view)
 102 {
 103         int old_x = view->scroll_x;
 104         int old_y = view->scroll_y;
 105
 106         if (view->hadjustment)
 107                 view->scroll_x = view->hadjustment->value;
 108         else
 109                 view->scroll_x = 0;
 110
 111         if (view->vadjustment)
 112                 view->scroll_y = view->vadjustment->value;
 113         else
 114                 view->scroll_y = 0;
 115
 116         if (GTK_WIDGET_REALIZED (view) &&
 117             (view->scroll_x != old_x || view->scroll_y != old_y)) {
 118                 gdk_window_move (view->bin_window, - view->scroll_x, - view->scroll_y);
 119                 gdk_window_process_updates (view->bin_window, TRUE);
 120         }
 121 }
 122
 123 static void
 124 view_set_adjustment_values (EvView         *view,
 125                             GtkOrientation  orientation)
 126 {
 127         GtkWidget *widget = GTK_WIDGET (view);
 128         GtkAdjustment *adjustment;
 129         gboolean value_changed = FALSE;
 130         int requisition;
 131         int allocation;
 132
 133         if (orientation == GTK_ORIENTATION_HORIZONTAL)  {
 134                 requisition = widget->requisition.width;
 135                 allocation = widget->allocation.width;
 136                 adjustment = view->hadjustment;
 137         } else {
 138                 requisition = widget->requisition.height;
 139                 allocation = widget->allocation.height;
 140                 adjustment = view->vadjustment;
 141         }
 142
 143         if (!adjustment)
 144                 return;
 145
 146         adjustment->page_size = allocation;
 147         adjustment->step_increment = allocation * 0.1;
 148         adjustment->page_increment = allocation * 0.9;
 149         adjustment->lower = 0;
 150         adjustment->upper = MAX (allocation, requisition);
 151
 152         if (adjustment->value > adjustment->upper - adjustment->page_size) {
 153                 adjustment->value = adjustment->upper - adjustment->page_size;
 154                 value_changed = TRUE;
 155         }
 156
 157         gtk_adjustment_changed (adjustment);
 158         if (value_changed)
 159                 gtk_adjustment_value_changed (adjustment);
 160 }
 161
 162 /*** Virtual function implementations ***/
 163
 164 static void
 165 ev_view_finalize (GObject *object)
 166 {
 167         EvView *view = EV_VIEW (object);
 168
 169         if (view->document)
 170                 g_object_unref (view->document);
 171
 172         if (view->history)
 173                 g_object_unref (view->history);
 174
 175         ev_view_set_scroll_adjustments (view, NULL, NULL);
 176
 177         g_array_free (view->find_results, TRUE);
 178         view->find_results = NULL;
 179
 180         G_OBJECT_CLASS (ev_view_parent_class)->finalize (object);
 181 }
 182
 183 static void
 184 ev_view_destroy (GtkObject *object)
 185 {
 186         EvView *view = EV_VIEW (object);
 187
 188         ev_view_set_scroll_adjustments (view, NULL, NULL);
 189
 190         GTK_OBJECT_CLASS (ev_view_parent_class)->destroy (object);
 191 }
 192
 193 static void
 194 ev_view_size_request (GtkWidget      *widget,
 195                       GtkRequisition *requisition)
 196 {
 197         EvView *view = EV_VIEW (widget);
 198
 199         if (GTK_WIDGET_REALIZED (widget)) {
 200                 if (view->document) {
 201                         ev_document_get_page_size (view->document,
 202                                                    &requisition->width,
 203                                                    &requisition->height);
 204                 } else {
 205                         requisition->width = 10;
 206                         requisition->height = 10;
 207                 }
 208         }
 209
 210 }
 211
 212 static void
 213 ev_view_size_allocate (GtkWidget      *widget,
 214                        GtkAllocation  *allocation)
 215 {
 216         EvView *view = EV_VIEW (widget);
 217
 218         GTK_WIDGET_CLASS (ev_view_parent_class)->size_allocate (widget, allocation);
 219
 220         view_set_adjustment_values (view, GTK_ORIENTATION_HORIZONTAL);
 221         view_set_adjustment_values (view, GTK_ORIENTATION_VERTICAL);
 222
 223         if (GTK_WIDGET_REALIZED (widget)) {
 224                 gdk_window_resize (view->bin_window,
 225                                    MAX (widget->allocation.width, widget->requisition.width),
 226                                    MAX (widget->allocation.height, widget->requisition.height));
 227         }
 228 }
 229
 230 static void
 231 update_window_backgrounds (EvView *view)
 232 {
 233         GtkWidget *widget = GTK_WIDGET (view);
 234
 235         if (GTK_WIDGET_REALIZED (view)) {
 236                 gdk_window_set_background (view->bin_window,
 237                                            &widget->style->base[GTK_WIDGET_STATE (widget)]);
 238         }
 239 }
 240
 241 static void
 242 ev_view_realize (GtkWidget *widget)
 243 {
 244         EvView *view = EV_VIEW (widget);
 245         GdkWindowAttr attributes;
 246
 247         GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 248
 249         attributes.window_type = GDK_WINDOW_CHILD;
 250         attributes.wclass = GDK_INPUT_OUTPUT;
 251         attributes.visual = gtk_widget_get_visual (widget);
 252         attributes.colormap = gtk_widget_get_colormap (widget);
 253
 254         attributes.x = widget->allocation.x;
 255         attributes.y = widget->allocation.y;
 256         attributes.width = widget->allocation.width;
 257         attributes.height = widget->allocation.height;
 258         attributes.event_mask = 0;
 259
 260         widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
 261                                          &attributes,
 262                                          GDK_WA_X | GDK_WA_Y |
 263                                          GDK_WA_COLORMAP |
 264                                          GDK_WA_VISUAL);
 265         gdk_window_set_user_data (widget->window, widget);
 266         widget->style = gtk_style_attach (widget->style, widget->window);
 267
 268         attributes.x = 0;
 269         attributes.y = 0;
 270         attributes.width = MAX (widget->allocation.width, widget->requisition.width);
 271         attributes.height = MAX (widget->allocation.height, widget->requisition.height);
 272         attributes.event_mask = GDK_EXPOSURE_MASK |
 273                                 GDK_BUTTON_PRESS_MASK |
 274                                 GDK_BUTTON_RELEASE_MASK |
 275                                 GDK_SCROLL_MASK |
 276                                 GDK_KEY_PRESS_MASK |
 277                                 GDK_BUTTON1_MOTION_MASK;
 278
 279         view->bin_window = gdk_window_new (widget->window,
 280                                            &attributes,
 281                                            GDK_WA_X | GDK_WA_Y |
 282                                            GDK_WA_COLORMAP |
 283                                            GDK_WA_VISUAL);
 284         gdk_window_set_user_data (view->bin_window, widget);
 285         gdk_window_show (view->bin_window);
 286
 287         if (view->document) {
 288                 ev_document_set_target (view->document, view->bin_window);
 289
 290                 /* We can't get page size without a target, so we have to
 291                  * queue a size request at realization. Could be fixed
 292                  * with EvDocument changes to allow setting a GdkScreen
 293                  * without setting a target.
 294                  */
 295                 gtk_widget_queue_resize (widget);
 296         }
 297
 298         update_window_backgrounds (view);
 299 }
 300
 301 static void
 302 ev_view_unrealize (GtkWidget *widget)
 303 {
 304         EvView *view = EV_VIEW (widget);
 305
 306         if (view->document)
 307                 ev_document_set_target (view->document, NULL);
 308
 309         gdk_window_set_user_data (view->bin_window, NULL);
 310         gdk_window_destroy (view->bin_window);
 311         view->bin_window = NULL;
 312
 313         GTK_WIDGET_CLASS (ev_view_parent_class)->unrealize (widget);
 314 }
 315
 316 static void
 317 ev_view_style_set (GtkWidget      *widget,
 318                    GtkStyle       *previous_style)
 319 {
 320         update_window_backgrounds (EV_VIEW (widget));
 321 }
 322
 323 static void
 324 ev_view_state_changed (GtkWidget    *widget,
 325                        GtkStateType  previous_state)
 326 {
 327         update_window_backgrounds (EV_VIEW (widget));
 328 }
 329
 330 static guint32
 331 ev_gdk_color_to_rgb (const GdkColor *color)
 332 {
 333   guint32 result;
 334   result = (0xff0000 | (color->red & 0xff00));
 335   result <<= 8;
 336   result |= ((color->green & 0xff00) | (color->blue >> 8));
 337   return result;
 338 }
 339
 340 static void
 341 draw_rubberband (GtkWidget *widget, GdkWindow *window, const GdkRectangle *rect)
 342 {
 343         GdkGC *gc;
 344         GdkPixbuf *pixbuf;
 345         GdkColor *fill_color_gdk;
 346         guint fill_color;
 347
 348         fill_color_gdk = gdk_color_copy (&GTK_WIDGET (widget)->style->base[GTK_STATE_SELECTED]);
 349         fill_color = ev_gdk_color_to_rgb (fill_color_gdk) << 8 | 0x40;
 350
 351         pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8,
 352                                  rect->width, rect->height);
 353         gdk_pixbuf_fill (pixbuf, fill_color);
 354
 355         gdk_draw_pixbuf (window, NULL, pixbuf,
 356                          0, 0,
 357                          rect->x,rect->y,
 358                          rect->width, rect->height,
 359                          GDK_RGB_DITHER_NONE,
 360                          0, 0);
 361
 362         g_object_unref (pixbuf);
 363
 364         gc = gdk_gc_new (window);
 365         gdk_gc_set_rgb_fg_color (gc, fill_color_gdk);
 366         gdk_draw_rectangle (window, gc, FALSE,
 367                             rect->x, rect->y,
 368                             rect->width - 1,
 369                             rect->height - 1);
 370         g_object_unref (gc);
 371
 372         gdk_color_free (fill_color_gdk);
 373 }
 374
 375 static void
 376 expose_bin_window (GtkWidget      *widget,
 377                    GdkEventExpose *event)
 378 {
 379         EvView *view = EV_VIEW (widget);
 380         int i;
 381         int current_page;
 382         const EvFindResult *results;
 383
 384         if (view->document == NULL)
 385                 return;
 386
 387         ev_document_render (view->document,
 388                             event->area.x, event->area.y,
 389                             event->area.width, event->area.height);
 390
 391         results = (EvFindResult*) view->find_results->data;
 392         current_page = ev_document_get_page (view->document);
 393         i = 0;
 394         while (i < view->find_results->len) {
 395 #if 0
 396                 g_printerr ("highlighting result %d page %d at %d,%d %dx%d\n",
 397                             i, results[i].page_num,
 398                             results[i].highlight_area.x,
 399                             results[i].highlight_area.y,
 400                             results[i].highlight_area.width,
 401                             results[i].highlight_area.height);
 402 #endif
 403                 if (results[i].page_num == current_page)
 404                         draw_rubberband (widget, view->bin_window,
 405                                          &results[i].highlight_area);
 406                 ++i;
 407         }
 408
 409         if (view->has_selection) {
 410                 draw_rubberband (widget, view->bin_window, &view->selection);
 411         }
 412 }
 413
 414 static gboolean
 415 ev_view_expose_event (GtkWidget      *widget,
 416                       GdkEventExpose *event)
 417 {
 418         EvView *view = EV_VIEW (widget);
 419
 420         if (event->window == view->bin_window)
 421                 expose_bin_window (widget, event);
 422         else
 423                 return GTK_WIDGET_CLASS (ev_view_parent_class)->expose_event (widget, event);
 424
 425         return FALSE;
 426 }
 427
 428 void
 429 ev_view_select_all (EvView *ev_view)
 430 {
 431         GtkWidget *widget = GTK_WIDGET (ev_view);
 432
 433         g_return_if_fail (EV_IS_VIEW (ev_view));
 434
 435         ev_view->has_selection = TRUE;
 436         ev_view->selection.x = ev_view->selection.y = 0;
 437         ev_view->selection.width = widget->requisition.width;
 438         ev_view->selection.height = widget->requisition.height;
 439
 440         gtk_widget_queue_draw (widget);
 441 }
 442
 443 void
 444 ev_view_copy (EvView *ev_view)
 445 {
 446         GtkClipboard *clipboard;
 447         char *text;
 448
 449         text = ev_document_get_text (ev_view->document, &ev_view->selection);
 450         clipboard = gtk_widget_get_clipboard (GTK_WIDGET (ev_view),
 451                                               GDK_SELECTION_CLIPBOARD);
 452         gtk_clipboard_set_text (clipboard, text, -1);
 453         g_free (text);
 454 }
 455
 456 static void
 457 ev_view_primary_get_cb (GtkClipboard     *clipboard,
 458                         GtkSelectionData *selection_data,
 459                         guint             info,
 460                         gpointer          data)
 461 {
 462         EvView *ev_view = EV_VIEW (data);
 463         char *text;
 464
 465         text = ev_document_get_text (ev_view->document, &ev_view->selection);
 466         gtk_selection_data_set_text (selection_data, text, -1);
 467 }
 468
 469 static void
 470 ev_view_primary_clear_cb (GtkClipboard *clipboard,
 471                           gpointer      data)
 472 {
 473         EvView *ev_view = EV_VIEW (data);
 474
 475         ev_view->has_selection = FALSE;
 476 }
 477
 478 static void
 479 ev_view_update_primary_selection (EvView *ev_view)
 480 {
 481         GtkClipboard *clipboard;
 482
 483         clipboard = gtk_widget_get_clipboard (GTK_WIDGET (ev_view),
 484                                               GDK_SELECTION_PRIMARY);
 485
 486         if (ev_view->has_selection) {
 487                 if (!gtk_clipboard_set_with_owner (clipboard,
 488                                                    targets,
 489                                                    G_N_ELEMENTS (targets),
 490                                                    ev_view_primary_get_cb,
 491                                                    ev_view_primary_clear_cb,
 492                                                    G_OBJECT (ev_view)))
 493                         ev_view_primary_clear_cb (clipboard, ev_view);
 494         } else {
 495                 if (gtk_clipboard_get_owner (clipboard) == G_OBJECT (ev_view))
 496                         gtk_clipboard_clear (clipboard);
 497         }
 498 }
 499
 500 static gboolean
 501 ev_view_button_press_event (GtkWidget      *widget,
 502                             GdkEventButton *event)
 503 {
 504         EvView *view = EV_VIEW (widget);
 505
 506         if (!GTK_WIDGET_HAS_FOCUS (widget)) {
 507                 gtk_widget_grab_focus (widget);
 508         }
 509
 510         switch (event->button) {
 511                 case 1:
 512                         if (view->has_selection) {
 513                                 view->has_selection = FALSE;
 514                                 gtk_widget_queue_draw (widget);
 515                         }
 516
 517                         view->selection.x = event->x;
 518                         view->selection.y = event->y;
 519                         view->selection.width = 0;
 520                         view->selection.height = 0;
 521                         break;
 522         }
 523
 524         return TRUE;
 525 }
 526
 527 static gboolean
 528 ev_view_motion_notify_event (GtkWidget      *widget,
 529                              GdkEventMotion *event)
 530 {
 531         EvView *view = EV_VIEW (widget);
 532
 533         view->has_selection = TRUE;
 534         view->selection.x = MIN (view->selection.x, event->x);
 535         view->selection.y = MIN (view->selection.y, event->y);
 536         view->selection.width = ABS (view->selection.x - event->x) + 1;
 537         view->selection.height = ABS (view->selection.y - event->y) + 1;
 538
 539         gtk_widget_queue_draw (widget);
 540
 541         return TRUE;
 542 }
 543
 544 static gboolean
 545 ev_view_button_release_event (GtkWidget      *widget,
 546                               GdkEventButton *event)
 547 {
 548         EvView *view = EV_VIEW (widget);
 549
 550         ev_view_update_primary_selection (view);
 551
 552         return FALSE;
 553 }
 554
 555 static void
 556 on_adjustment_value_changed (GtkAdjustment  *adjustment,
 557                              EvView *view)
 558 {
 559         view_update_adjustments (view);
 560 }
 561
 562 static void
 563 set_scroll_adjustment (EvView *view,
 564                        GtkOrientation  orientation,
 565                        GtkAdjustment  *adjustment)
 566 {
 567         GtkAdjustment **to_set;
 568
 569         if (orientation == GTK_ORIENTATION_HORIZONTAL)
 570                 to_set = &view->hadjustment;
 571         else
 572                 to_set = &view->vadjustment;
 573
 574         if (*to_set != adjustment) {
 575                 if (*to_set) {
 576                         g_signal_handlers_disconnect_by_func (*to_set,
 577                                                               (gpointer) on_adjustment_value_changed,
 578                                                               view);
 579                         g_object_unref (*to_set);
 580                 }
 581
 582                 *to_set = adjustment;
 583                 view_set_adjustment_values (view, orientation);
 584
 585                 if (*to_set) {
 586                         g_object_ref (*to_set);
 587                         g_signal_connect (*to_set, "value_changed",
 588                                           G_CALLBACK (on_adjustment_value_changed), view);
 589                 }
 590         }
 591 }
 592
 593 static void
 594 ev_view_set_scroll_adjustments (EvView *view,
 595                                 GtkAdjustment  *hadjustment,
 596                                 GtkAdjustment  *vadjustment)
 597 {
 598         set_scroll_adjustment (view, GTK_ORIENTATION_HORIZONTAL, hadjustment);
 599         set_scroll_adjustment (view, GTK_ORIENTATION_VERTICAL, vadjustment);
 600
 601         view_update_adjustments (view);
 602 }
 603
 604 static void
 605 add_scroll_binding (GtkBindingSet  *binding_set,
 606                     guint           keyval,
 607                     GtkScrollType   scroll,
 608                     gboolean        horizontal)
 609 {
 610   guint keypad_keyval = keyval - GDK_Left + GDK_KP_Left;
 611
 612   gtk_binding_entry_add_signal (binding_set, keyval, 0,
 613                                 "scroll_view", 2,
 614                                 GTK_TYPE_SCROLL_TYPE, scroll,
 615                                 G_TYPE_BOOLEAN, horizontal);
 616   gtk_binding_entry_add_signal (binding_set, keypad_keyval, 0,
 617                                 "scroll_view", 2,
 618                                 GTK_TYPE_SCROLL_TYPE, scroll,
 619                                 G_TYPE_BOOLEAN, horizontal);
 620 }
 621
 622 static void
 623 ev_view_scroll_view (EvView *view,
 624                      GtkScrollType scroll,
 625                      gboolean horizontal)
 626 {
 627         if (scroll == GTK_SCROLL_PAGE_BACKWARD) {
 628                 ev_view_set_page (view, ev_view_get_page (view) - 1);
 629         } else if (scroll == GTK_SCROLL_PAGE_FORWARD) {
 630                 ev_view_set_page (view, ev_view_get_page (view) + 1);
 631         } else {
 632                 GtkAdjustment *adjustment;
 633                 double value;
 634
 635                 if (horizontal) {
 636                         adjustment = view->hadjustment;
 637                 } else {
 638                         adjustment = view->vadjustment;
 639                 }
 640
 641                 value = adjustment->value;
 642
 643                 switch (scroll) {
 644                         case GTK_SCROLL_STEP_BACKWARD:
 645                                 value -= adjustment->step_increment;
 646                                 break;
 647                         case GTK_SCROLL_STEP_FORWARD:
 648                                 value += adjustment->step_increment;
 649                                 break;
 650                         default:
 651                                 break;
 652                 }
 653
 654                 value = CLAMP (value, adjustment->lower,
 655                                adjustment->upper - adjustment->page_size);
 656
 657                 gtk_adjustment_set_value (adjustment, value);
 658         }
 659 }
 660
 661 static void
 662 ev_view_class_init (EvViewClass *class)
 663 {
 664         GObjectClass *object_class = G_OBJECT_CLASS (class);
 665         GtkObjectClass *gtk_object_class = GTK_OBJECT_CLASS (class);
 666         GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
 667         GtkBindingSet *binding_set;
 668
 669         object_class->finalize = ev_view_finalize;
 670
 671         widget_class->expose_event = ev_view_expose_event;
 672         widget_class->button_press_event = ev_view_button_press_event;
 673         widget_class->motion_notify_event = ev_view_motion_notify_event;
 674         widget_class->button_release_event = ev_view_button_release_event;
 675         widget_class->size_request = ev_view_size_request;
 676         widget_class->size_allocate = ev_view_size_allocate;
 677         widget_class->realize = ev_view_realize;
 678         widget_class->unrealize = ev_view_unrealize;
 679         widget_class->style_set = ev_view_style_set;
 680         widget_class->state_changed = ev_view_state_changed;
 681         gtk_object_class->destroy = ev_view_destroy;
 682
 683         class->set_scroll_adjustments = ev_view_set_scroll_adjustments;
 684         class->scroll_view = ev_view_scroll_view;
 685
 686         widget_class->set_scroll_adjustments_signal =  g_signal_new ("set-scroll-adjustments",
 687                                                                      G_OBJECT_CLASS_TYPE (object_class),
 688                                                                      G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 689                                                                      G_STRUCT_OFFSET (EvViewClass, set_scroll_adjustments),
 690                                                                      NULL, NULL,
 691                                                                      ev_marshal_VOID__OBJECT_OBJECT,
 692                                                                      G_TYPE_NONE, 2,
 693                                                                      GTK_TYPE_ADJUSTMENT,
 694                                                                      GTK_TYPE_ADJUSTMENT);
 695         page_changed_signal = g_signal_new ("page-changed",
 696                                             G_OBJECT_CLASS_TYPE (object_class),
 697                                             G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 698                                             G_STRUCT_OFFSET (EvViewClass, page_changed),
 699                                             NULL, NULL,
 700                                             ev_marshal_VOID__NONE,
 701                                             G_TYPE_NONE, 0);
 702
 703         g_signal_new ("find-status-changed",
 704                       G_OBJECT_CLASS_TYPE (object_class),
 705                       G_SIGNAL_RUN_LAST,
 706                       0,
 707                       NULL, NULL,
 708                       ev_marshal_VOID__NONE,
 709                       G_TYPE_NONE, 0);
 710
 711         g_signal_new ("scroll_view",
 712                       G_TYPE_FROM_CLASS (object_class),
 713                       G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 714                       G_STRUCT_OFFSET (EvViewClass, scroll_view),
 715                       NULL, NULL,
 716                       ev_marshal_VOID__ENUM_BOOLEAN,
 717                       G_TYPE_NONE, 2,
 718                       GTK_TYPE_SCROLL_TYPE,
 719                       G_TYPE_BOOLEAN);
 720
 721         binding_set = gtk_binding_set_by_class (class);
 722
 723         add_scroll_binding (binding_set, GDK_Left,  GTK_SCROLL_STEP_BACKWARD, TRUE);
 724         add_scroll_binding (binding_set, GDK_Right, GTK_SCROLL_STEP_FORWARD,  TRUE);
 725         add_scroll_binding (binding_set, GDK_Up,    GTK_SCROLL_STEP_BACKWARD, FALSE);
 726         add_scroll_binding (binding_set, GDK_Down,  GTK_SCROLL_STEP_FORWARD,  FALSE);
 727
 728         add_scroll_binding (binding_set, GDK_Page_Up,   GTK_SCROLL_PAGE_BACKWARD, FALSE);
 729         add_scroll_binding (binding_set, GDK_Page_Down, GTK_SCROLL_PAGE_FORWARD,  FALSE);
 730 }
 731
 732 static void
 733 ev_view_init (EvView *view)
 734 {
 735         static const GdkColor white = { 0, 0xffff, 0xffff, 0xffff };
 736
 737         GTK_WIDGET_SET_FLAGS (view, GTK_CAN_FOCUS);
 738
 739         view->scale = 1.0;
 740
 741         gtk_widget_modify_bg (GTK_WIDGET (view), GTK_STATE_NORMAL, &white);
 742
 743         view->find_results = g_array_new (FALSE,
 744                                           FALSE,
 745                                           sizeof (EvFindResult));
 746         view->results_on_this_page = 0;
 747         view->next_page_with_result = 0;
 748 }
 749
 750 static void
 751 update_find_results (EvView *view)
 752 {
 753         const EvFindResult *results;
 754         int i;
 755         int on_this_page;
 756         int next_page_with_result;
 757         int earliest_page_with_result;
 758         int current_page;
 759         gboolean counts_changed;
 760
 761         results = (EvFindResult*) view->find_results->data;
 762         current_page = ev_document_get_page (view->document);
 763         next_page_with_result = 0;
 764         on_this_page = 0;
 765         earliest_page_with_result = 0;
 766
 767         i = 0;
 768         while (i < view->find_results->len) {
 769                 if (results[i].page_num == current_page) {
 770                         ++on_this_page;
 771                 } else {
 772                         int delta = results[i].page_num - current_page;
 773
 774                         if (delta > 0 && /* result on later page */
 775                             (next_page_with_result == 0 ||
 776                              results[i].page_num < next_page_with_result))
 777                                 next_page_with_result = results[i].page_num;
 778
 779                         if (delta < 0 && /* result on a previous page */
 780                             (earliest_page_with_result == 0 ||
 781                              results[i].page_num < earliest_page_with_result))
 782                                 earliest_page_with_result = results[i].page_num;
 783                 }
 784                 ++i;
 785         }
 786
 787         /* If earliest page is just the current page, there is no earliest page */
 788         if (earliest_page_with_result == current_page)
 789                 earliest_page_with_result = 0;
 790
 791         /* If no next page, then wrap and the wrapped page is the next page */
 792         if (next_page_with_result == 0)
 793                 next_page_with_result = earliest_page_with_result;
 794
 795         counts_changed = FALSE;
 796         if (on_this_page != view->results_on_this_page ||
 797             next_page_with_result != view->next_page_with_result) {
 798                 view->results_on_this_page = on_this_page;
 799                 view->next_page_with_result = next_page_with_result;
 800                 counts_changed = TRUE;
 801         }
 802
 803         /* If there are no results at all, then the
 804          * results of ev_view_get_find_status_message() will change
 805          * to reflect the percent_complete so we have to emit the signal
 806          */
 807         if (counts_changed ||
 808             view->find_results->len == 0) {
 809                 g_signal_emit_by_name (view,
 810                                        "find-status-changed");
 811         }
 812 }
 813
 814 static void
 815 found_results_callback (EvDocument         *document,
 816                         const EvFindResult *results,
 817                         int                 n_results,
 818                         double              percent_complete,
 819                         void               *data)
 820 {
 821   EvView *view = EV_VIEW (data);
 822
 823   g_array_set_size (view->find_results, 0);
 824
 825   if (n_results > 0)
 826           g_array_append_vals (view->find_results,
 827                                results, n_results);
 828
 829 #if 0
 830   {
 831           int i;
 832
 833           g_printerr ("%d results %d%%: ", n_results,
 834                       (int) (percent_complete * 100));
 835           i = 0;
 836           while (i < n_results) {
 837                   g_printerr ("%d ", results[i].page_num);
 838                   ++i;
 839           }
 840           g_printerr ("\n");
 841   }
 842 #endif
 843
 844   view->find_percent_complete = percent_complete;
 845   update_find_results (view);
 846
 847   gtk_widget_queue_draw (GTK_WIDGET (view));
 848 }
 849
 850 /*** Public API ***/
 851
 852 GtkWidget*
 853 ev_view_new (void)
 854 {
 855         return g_object_new (EV_TYPE_VIEW, NULL);
 856 }
 857
 858 static void
 859 document_changed_callback (EvDocument *document,
 860                            EvView     *view)
 861 {
 862         gtk_widget_queue_draw (GTK_WIDGET (view));
 863 }
 864
 865 void
 866 ev_view_set_document (EvView     *view,
 867                       EvDocument *document)
 868 {
 869         g_return_if_fail (EV_IS_VIEW (view));
 870
 871         if (document != view->document) {
 872                 int old_page = ev_view_get_page (view);
 873
 874                 if (view->document) {
 875                         g_signal_handlers_disconnect_by_func (view->document,
 876                                                               found_results_callback,
 877                                                               view);
 878                         g_array_set_size (view->find_results, 0);
 879                         view->results_on_this_page = 0;
 880                         view->next_page_with_result = 0;
 881
 882                         g_object_unref (view->document);
 883                 }
 884
 885                 view->document = document;
 886
 887                 if (view->document) {
 888                         g_object_ref (view->document);
 889                         if (EV_IS_DOCUMENT_FIND (view->document))
 890                                 g_signal_connect (view->document,
 891                                                   "found",
 892                                                   G_CALLBACK (found_results_callback),
 893                                                   view);
 894                         g_signal_connect (view->document,
 895                                           "changed",
 896                                           G_CALLBACK (document_changed_callback),
 897                                           view);
 898                 }
 899
 900                 if (GTK_WIDGET_REALIZED (view))
 901                         ev_document_set_target (view->document, view->bin_window);
 902
 903                 gtk_widget_queue_resize (GTK_WIDGET (view));
 904
 905                 if (old_page != ev_view_get_page (view))
 906                         g_signal_emit (view, page_changed_signal, 0);
 907         }
 908 }
 909
 910 static void
 911 set_document_page (EvView *view, int page)
 912 {
 913         if (view->document) {
 914                 int old_page = ev_document_get_page (view->document);
 915                 if (old_page != page)
 916                         ev_document_set_page (view->document, page);
 917                 if (old_page != ev_document_get_page (view->document)) {
 918                         g_signal_emit (view, page_changed_signal, 0);
 919
 920                         view->find_percent_complete = 0.0;
 921                         update_find_results (view);
 922                 }
 923         }
 924 }
 925
 926 static void
 927 go_to_link (EvView *view, EvLink *link)
 928 {
 929         EvLinkType type;
 930         int page;
 931
 932         type = ev_link_get_link_type (link);
 933
 934         if (type == EV_LINK_TYPE_PAGE) {
 935                 page = ev_link_get_page (link);
 936                 set_document_page (view, page);
 937         }
 938 }
 939
 940 void
 941 ev_view_go_to_link (EvView *view, EvLink *link)
 942 {
 943         go_to_link (view, link);
 944         ev_history_add_link (view->history, link);
 945 }
 946
 947 static void
 948 go_to_index (EvView *view, int index)
 949 {
 950         EvLink *link;
 951
 952         link = ev_history_get_link_nth (view->history, index);
 953         g_return_if_fail (link != NULL);
 954
 955         go_to_link (view, link);
 956 }
 957
 958 void
 959 ev_view_go_back (EvView *view)
 960 {
 961         int index, n;
 962
 963         g_return_if_fail (EV_IS_HISTORY (view->history));
 964
 965         index = ev_history_get_current_index (view->history);
 966         n = ev_history_get_n_links (view->history);
 967
 968         if (n > 0) {
 969                 index = MAX (0, index - 1);
 970                 ev_history_set_current_index (view->history, index);
 971         }
 972 }
 973
 974 void
 975 ev_view_go_forward (EvView *view)
 976 {
 977         int index, n;
 978
 979         g_return_if_fail (EV_IS_HISTORY (view->history));
 980
 981         index = ev_history_get_current_index (view->history);
 982         n = ev_history_get_n_links (view->history);
 983
 984         if (n > 0) {
 985                 index = MIN (n - 1, index + 1);
 986                 ev_history_set_current_index (view->history, index);
 987         }
 988 }
 989
 990
 991 void
 992 ev_view_set_page (EvView *view,
 993                   int     page)
 994 {
 995         g_return_if_fail (EV_IS_VIEW (view));
 996         g_return_if_fail (EV_IS_HISTORY (view->history));
 997
 998         set_document_page (view, page);
 999         ev_history_add_page (view->history, page);
1000 }
1001
1002 int
1003 ev_view_get_page (EvView *view)
1004 {
1005         if (view->document)
1006                 return ev_document_get_page (view->document);
1007         else
1008                 return 1;
1009 }
1010
1011 #define ZOOM_IN_FACTOR  1.2
1012 #define ZOOM_OUT_FACTOR (1.0/ZOOM_IN_FACTOR)
1013
1014 #define MIN_SCALE 0.05409
1015 #define MAX_SCALE 18.4884
1016
1017 static void
1018 ev_view_zoom (EvView   *view,
1019               double    factor,
1020               gboolean  relative)
1021 {
1022         double scale;
1023
1024         if (relative)
1025                 scale = view->scale * factor;
1026         else
1027                 scale = factor;
1028
1029         view->scale = CLAMP (scale, MIN_SCALE, MAX_SCALE);
1030
1031         ev_document_set_scale (view->document, view->scale);
1032
1033         gtk_widget_queue_resize (GTK_WIDGET (view));
1034 }
1035
1036 void
1037 ev_view_zoom_in (EvView *view)
1038 {
1039         ev_view_zoom (view, ZOOM_IN_FACTOR, TRUE);
1040 }
1041
1042 void
1043 ev_view_zoom_out (EvView *view)
1044 {
1045         ev_view_zoom (view, ZOOM_OUT_FACTOR, TRUE);
1046 }
1047
1048 void
1049 ev_view_normal_size (EvView *view)
1050 {
1051         ev_view_zoom (view, 1.0, FALSE);
1052 }
1053
1054 void
1055 ev_view_best_fit (EvView *view)
1056 {
1057         double scale;
1058         int width, height;
1059
1060         width = height = 0;
1061         ev_document_get_page_size (view->document, &width, &height);
1062
1063         scale = 1.0;
1064         if (width != 0 && height != 0) {
1065                 double scale_w, scale_h;
1066
1067                 scale_w = (double)GTK_WIDGET (view)->allocation.width * view->scale / width;
1068                 scale_h = (double)GTK_WIDGET (view)->allocation.height * view->scale / height;
1069
1070                 scale = (scale_w < scale_h) ? scale_w : scale_h;
1071         }
1072
1073         ev_view_zoom (view, scale, FALSE);
1074 }
1075
1076 void
1077 ev_view_fit_width (EvView *view)
1078 {
1079         double scale = 1.0;
1080         int width;
1081
1082         width = 0;
1083         ev_document_get_page_size (view->document, &width, NULL);
1084
1085         scale = 1.0;
1086         if (width != 0)
1087                 scale = (double)GTK_WIDGET (view)->allocation.width * view->scale / width;
1088
1089         ev_view_zoom (view, scale, FALSE);
1090 }
1091
1092 char*
1093 ev_view_get_find_status_message (EvView *view)
1094 {
1095         if (view->find_results->len == 0) {
1096                 if (view->find_percent_complete >= (1.0 - 1e-10)) {
1097                         return g_strdup (_("Not found"));
1098                 } else {
1099                         return g_strdup_printf (_("%3d%% remaining to search"),
1100                                                 (int) ((1.0 - view->find_percent_complete) * 100));
1101                 }
1102         } else if (view->results_on_this_page == 0) {
1103                 g_assert (view->next_page_with_result != 0);
1104                 return g_strdup_printf (_("Found on page %d"),
1105                                         view->next_page_with_result);
1106         } else {
1107                 return g_strdup_printf (_("%d found on this page"),
1108                                         view->results_on_this_page);
1109         }
1110 }
1111
1112 static void
1113 history_index_changed_cb (EvHistory  *history,
1114                           GParamSpec *pspec,
1115                           EvView     *view)
1116 {
1117         int index;
1118
1119         index = ev_history_get_current_index (history);
1120         go_to_index (view, index);
1121 }
1122
1123 void
1124 ev_view_set_history (EvView     *view,
1125                      EvHistory  *history)
1126 {
1127         if (view->history) {
1128                 g_object_unref (view->history);
1129         }
1130
1131         view->history = g_object_ref (history);
1132         ev_history_add_page (view->history, ev_view_get_page (view));
1133
1134         g_signal_connect (view->history, "notify::index",
1135                           G_CALLBACK (history_index_changed_cb),
1136                           view);
1137 }