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 <gdk/gdkkeysyms.h>
  25
  26 #include "ev-marshal.h"
  27 #include "ev-view.h"
  28 #include "ev-document-find.h"
  29
  30 #define EV_VIEW_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), EV_TYPE_VIEW, EvViewClass))
  31 #define EV_IS_VIEW_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), EV_TYPE_VIEW))
  32 #define EV_VIEW_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), EV_TYPE_VIEW, EvViewClass))
  33
  34 struct _EvView {
  35         GtkWidget parent_instance;
  36
  37         EvDocument *document;
  38
  39         GdkWindow *bin_window;
  40
  41         int scroll_x;
  42         int scroll_y;
  43
  44         GtkAdjustment *hadjustment;
  45         GtkAdjustment *vadjustment;
  46
  47         GArray *find_results;
  48         int results_on_this_page;
  49         int next_page_with_result;
  50         double find_percent_complete;
  51
  52         double scale;
  53 };
  54
  55 struct _EvViewClass {
  56         GtkWidgetClass parent_class;
  57
  58         void    (*set_scroll_adjustments) (EvView         *view,
  59                                            GtkAdjustment  *hadjustment,
  60                                            GtkAdjustment  *vadjustment);
  61         void    (*scroll_view)            (EvView         *view,
  62                                            GtkScrollType   scroll,
  63                                            gboolean        horizontal);
  64
  65         /* Should this be notify::page? */
  66         void    (*page_changed)           (EvView         *view);
  67 };
  68
  69 static guint page_changed_signal = 0;
  70
  71 static void ev_view_set_scroll_adjustments (EvView         *view,
  72                                             GtkAdjustment  *hadjustment,
  73                                             GtkAdjustment  *vadjustment);
  74
  75 G_DEFINE_TYPE (EvView, ev_view, GTK_TYPE_WIDGET)
  76
  77 /*** Helper functions ***/
  78
  79 static void
  80 view_update_adjustments (EvView *view)
  81 {
  82         int old_x = view->scroll_x;
  83         int old_y = view->scroll_y;
  84
  85         if (view->hadjustment)
  86                 view->scroll_x = view->hadjustment->value;
  87         else
  88                 view->scroll_x = 0;
  89
  90         if (view->vadjustment)
  91                 view->scroll_y = view->vadjustment->value;
  92         else
  93                 view->scroll_y = 0;
  94
  95         if (GTK_WIDGET_REALIZED (view) &&
  96             (view->scroll_x != old_x || view->scroll_y != old_y)) {
  97                 gdk_window_move (view->bin_window, - view->scroll_x, - view->scroll_y);
  98                 gdk_window_process_updates (view->bin_window, TRUE);
  99         }
 100 }
 101
 102 static void
 103 view_set_adjustment_values (EvView         *view,
 104                             GtkOrientation  orientation)
 105 {
 106         GtkWidget *widget = GTK_WIDGET (view);
 107         GtkAdjustment *adjustment;
 108         gboolean value_changed = FALSE;
 109         int requisition;
 110         int allocation;
 111
 112         if (orientation == GTK_ORIENTATION_HORIZONTAL)  {
 113                 requisition = widget->requisition.width;
 114                 allocation = widget->allocation.width;
 115                 adjustment = view->hadjustment;
 116         } else {
 117                 requisition = widget->requisition.height;
 118                 allocation = widget->allocation.height;
 119                 adjustment = view->vadjustment;
 120         }
 121
 122         if (!adjustment)
 123                 return;
 124
 125         adjustment->page_size = allocation;
 126         adjustment->step_increment = allocation * 0.1;
 127         adjustment->page_increment = allocation * 0.9;
 128         adjustment->lower = 0;
 129         adjustment->upper = MAX (allocation, requisition);
 130
 131         if (adjustment->value > adjustment->upper - adjustment->page_size) {
 132                 adjustment->value = adjustment->upper - adjustment->page_size;
 133                 value_changed = TRUE;
 134         }
 135
 136         gtk_adjustment_changed (adjustment);
 137         if (value_changed)
 138                 gtk_adjustment_value_changed (adjustment);
 139 }
 140
 141 /*** Virtual function implementations ***/
 142
 143 static void
 144 ev_view_finalize (GObject *object)
 145 {
 146         EvView *view = EV_VIEW (object);
 147
 148         if (view->document)
 149                 g_object_unref (view->document);
 150
 151         ev_view_set_scroll_adjustments (view, NULL, NULL);
 152
 153         g_array_free (view->find_results, TRUE);
 154         view->find_results = NULL;
 155
 156         G_OBJECT_CLASS (ev_view_parent_class)->finalize (object);
 157 }
 158
 159 static void
 160 ev_view_destroy (GtkObject *object)
 161 {
 162         EvView *view = EV_VIEW (object);
 163
 164         ev_view_set_scroll_adjustments (view, NULL, NULL);
 165
 166         GTK_OBJECT_CLASS (ev_view_parent_class)->destroy (object);
 167 }
 168
 169 static void
 170 ev_view_size_request (GtkWidget      *widget,
 171                       GtkRequisition *requisition)
 172 {
 173         EvView *view = EV_VIEW (widget);
 174
 175         if (GTK_WIDGET_REALIZED (widget)) {
 176                 if (view->document) {
 177                         ev_document_get_page_size (view->document,
 178                                                    &requisition->width,
 179                                                    &requisition->height);
 180                 } else {
 181                         requisition->width = 10;
 182                         requisition->height = 10;
 183                 }
 184         }
 185
 186 }
 187
 188 static void
 189 ev_view_size_allocate (GtkWidget      *widget,
 190                        GtkAllocation  *allocation)
 191 {
 192         EvView *view = EV_VIEW (widget);
 193
 194         GTK_WIDGET_CLASS (ev_view_parent_class)->size_allocate (widget, allocation);
 195
 196         view_set_adjustment_values (view, GTK_ORIENTATION_HORIZONTAL);
 197         view_set_adjustment_values (view, GTK_ORIENTATION_VERTICAL);
 198
 199         if (GTK_WIDGET_REALIZED (widget)) {
 200                 gdk_window_resize (view->bin_window,
 201                                    MAX (widget->allocation.width, widget->requisition.width),
 202                                    MAX (widget->allocation.height, widget->requisition.height));
 203         }
 204 }
 205
 206 static void
 207 update_window_backgrounds (EvView *view)
 208 {
 209         GtkWidget *widget = GTK_WIDGET (view);
 210
 211         if (GTK_WIDGET_REALIZED (view)) {
 212                 gdk_window_set_background (view->bin_window,
 213                                            &widget->style->base[GTK_WIDGET_STATE (widget)]);
 214         }
 215 }
 216
 217 static void
 218 ev_view_realize (GtkWidget *widget)
 219 {
 220         EvView *view = EV_VIEW (widget);
 221         GdkWindowAttr attributes;
 222
 223         GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 224
 225         attributes.window_type = GDK_WINDOW_CHILD;
 226         attributes.wclass = GDK_INPUT_OUTPUT;
 227         attributes.visual = gtk_widget_get_visual (widget);
 228         attributes.colormap = gtk_widget_get_colormap (widget);
 229
 230         attributes.x = widget->allocation.x;
 231         attributes.y = widget->allocation.y;
 232         attributes.width = widget->allocation.width;
 233         attributes.height = widget->allocation.height;
 234         attributes.event_mask = 0;
 235
 236         widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
 237                                          &attributes,
 238                                          GDK_WA_X | GDK_WA_Y |
 239                                          GDK_WA_COLORMAP |
 240                                          GDK_WA_VISUAL);
 241         gdk_window_set_user_data (widget->window, widget);
 242         widget->style = gtk_style_attach (widget->style, widget->window);
 243
 244         attributes.x = 0;
 245         attributes.y = 0;
 246         attributes.width = MAX (widget->allocation.width, widget->requisition.width);
 247         attributes.height = MAX (widget->allocation.height, widget->requisition.height);
 248         attributes.event_mask = GDK_EXPOSURE_MASK |
 249                                 GDK_BUTTON_PRESS_MASK |
 250                                 GDK_SCROLL_MASK |
 251                                 GDK_KEY_PRESS_MASK;
 252
 253         view->bin_window = gdk_window_new (widget->window,
 254                                            &attributes,
 255                                            GDK_WA_X | GDK_WA_Y |
 256                                            GDK_WA_COLORMAP |
 257                                            GDK_WA_VISUAL);
 258         gdk_window_set_user_data (view->bin_window, widget);
 259         gdk_window_show (view->bin_window);
 260
 261         if (view->document) {
 262                 ev_document_set_target (view->document, view->bin_window);
 263
 264                 /* We can't get page size without a target, so we have to
 265                  * queue a size request at realization. Could be fixed
 266                  * with EvDocument changes to allow setting a GdkScreen
 267                  * without setting a target.
 268                  */
 269                 gtk_widget_queue_resize (widget);
 270         }
 271
 272         update_window_backgrounds (view);
 273 }
 274
 275 static void
 276 ev_view_unrealize (GtkWidget *widget)
 277 {
 278         EvView *view = EV_VIEW (widget);
 279
 280         if (view->document)
 281                 ev_document_set_target (view->document, NULL);
 282
 283         gdk_window_set_user_data (view->bin_window, NULL);
 284         gdk_window_destroy (view->bin_window);
 285         view->bin_window = NULL;
 286
 287         GTK_WIDGET_CLASS (ev_view_parent_class)->unrealize (widget);
 288 }
 289
 290 static void
 291 ev_view_style_set (GtkWidget      *widget,
 292                    GtkStyle       *previous_style)
 293 {
 294         update_window_backgrounds (EV_VIEW (widget));
 295 }
 296
 297 static void
 298 ev_view_state_changed (GtkWidget    *widget,
 299                        GtkStateType  previous_state)
 300 {
 301         update_window_backgrounds (EV_VIEW (widget));
 302 }
 303
 304 static guint32
 305 ev_gdk_color_to_rgb (const GdkColor *color)
 306 {
 307   guint32 result;
 308   result = (0xff0000 | (color->red & 0xff00));
 309   result <<= 8;
 310   result |= ((color->green & 0xff00) | (color->blue >> 8));
 311   return result;
 312 }
 313
 314 static void
 315 draw_rubberband (GtkWidget *widget, GdkWindow *window, const GdkRectangle *rect)
 316 {
 317         GdkGC *gc;
 318         GdkPixbuf *pixbuf;
 319         GdkColor *fill_color_gdk;
 320         guint fill_color;
 321
 322         fill_color_gdk = gdk_color_copy (&GTK_WIDGET (widget)->style->base[GTK_STATE_SELECTED]);
 323         fill_color = ev_gdk_color_to_rgb (fill_color_gdk) << 8 | 0x40;
 324
 325         pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8,
 326                                  rect->width, rect->height);
 327         gdk_pixbuf_fill (pixbuf, fill_color);
 328
 329         gdk_draw_pixbuf (window, NULL, pixbuf,
 330                          0, 0,
 331                          rect->x,rect->y,
 332                          rect->width, rect->height,
 333                          GDK_RGB_DITHER_NONE,
 334                          0, 0);
 335
 336         g_object_unref (pixbuf);
 337
 338         gc = gdk_gc_new (window);
 339         gdk_gc_set_rgb_fg_color (gc, fill_color_gdk);
 340         gdk_draw_rectangle (window, gc, FALSE,
 341                             rect->x, rect->y,
 342                             rect->width - 1,
 343                             rect->height - 1);
 344         g_object_unref (gc);
 345
 346         gdk_color_free (fill_color_gdk);
 347 }
 348
 349 static void
 350 expose_bin_window (GtkWidget      *widget,
 351                    GdkEventExpose *event)
 352 {
 353         EvView *view = EV_VIEW (widget);
 354         int i;
 355         int current_page;
 356         const EvFindResult *results;
 357
 358         if (view->document == NULL)
 359                 return;
 360
 361         ev_document_render (view->document,
 362                             event->area.x, event->area.y,
 363                             event->area.width, event->area.height);
 364
 365         results = (EvFindResult*) view->find_results->data;
 366         current_page = ev_document_get_page (view->document);
 367         i = 0;
 368         while (i < view->find_results->len) {
 369 #if 0
 370                 g_printerr ("highlighting result %d page %d at %d,%d %dx%d\n",
 371                             i, results[i].page_num,
 372                             results[i].highlight_area.x,
 373                             results[i].highlight_area.y,
 374                             results[i].highlight_area.width,
 375                             results[i].highlight_area.height);
 376 #endif
 377                 if (results[i].page_num == current_page)
 378                         draw_rubberband (widget, view->bin_window,
 379                                          &results[i].highlight_area);
 380                 ++i;
 381         }
 382 }
 383
 384 static gboolean
 385 ev_view_expose_event (GtkWidget      *widget,
 386                       GdkEventExpose *event)
 387 {
 388         EvView *view = EV_VIEW (widget);
 389
 390         if (event->window == view->bin_window)
 391                 expose_bin_window (widget, event);
 392         else
 393                 return GTK_WIDGET_CLASS (ev_view_parent_class)->expose_event (widget, event);
 394
 395         return FALSE;
 396 }
 397
 398 static gboolean
 399 ev_view_button_press_event (GtkWidget      *widget,
 400                             GdkEventButton *event)
 401 {
 402         if (event->type == GDK_BUTTON_PRESS) {
 403                 if (!GTK_WIDGET_HAS_FOCUS (widget)) {
 404                         gtk_widget_grab_focus (widget);
 405                 }
 406         }
 407
 408         return TRUE;
 409 }
 410
 411 static gboolean
 412 ev_view_motion_notify_event (GtkWidget      *widget,
 413                              GdkEventMotion *event)
 414 {
 415         /* EvView *view = EV_VIEW (widget); */
 416
 417         return FALSE;
 418 }
 419
 420 static gboolean
 421 ev_view_button_release_event (GtkWidget      *widget,
 422                               GdkEventButton *event)
 423 {
 424         /* EvView *view = EV_VIEW (widget); */
 425
 426         return FALSE;
 427 }
 428
 429 static void
 430 on_adjustment_value_changed (GtkAdjustment  *adjustment,
 431                              EvView *view)
 432 {
 433         view_update_adjustments (view);
 434 }
 435
 436 static void
 437 set_scroll_adjustment (EvView *view,
 438                        GtkOrientation  orientation,
 439                        GtkAdjustment  *adjustment)
 440 {
 441         GtkAdjustment **to_set;
 442
 443         if (orientation == GTK_ORIENTATION_HORIZONTAL)
 444                 to_set = &view->hadjustment;
 445         else
 446                 to_set = &view->vadjustment;
 447
 448         if (*to_set != adjustment) {
 449                 if (*to_set) {
 450                         g_signal_handlers_disconnect_by_func (*to_set,
 451                                                               (gpointer) on_adjustment_value_changed,
 452                                                               view);
 453                         g_object_unref (*to_set);
 454                 }
 455
 456                 *to_set = adjustment;
 457                 view_set_adjustment_values (view, orientation);
 458
 459                 if (*to_set) {
 460                         g_object_ref (*to_set);
 461                         g_signal_connect (*to_set, "value_changed",
 462                                           G_CALLBACK (on_adjustment_value_changed), view);
 463                 }
 464         }
 465 }
 466
 467 static void
 468 ev_view_set_scroll_adjustments (EvView *view,
 469                                 GtkAdjustment  *hadjustment,
 470                                 GtkAdjustment  *vadjustment)
 471 {
 472         set_scroll_adjustment (view, GTK_ORIENTATION_HORIZONTAL, hadjustment);
 473         set_scroll_adjustment (view, GTK_ORIENTATION_VERTICAL, vadjustment);
 474
 475         view_update_adjustments (view);
 476 }
 477
 478 static void
 479 add_scroll_binding (GtkBindingSet  *binding_set,
 480                     guint           keyval,
 481                     GtkScrollType   scroll,
 482                     gboolean        horizontal)
 483 {
 484   guint keypad_keyval = keyval - GDK_Left + GDK_KP_Left;
 485
 486   gtk_binding_entry_add_signal (binding_set, keyval, 0,
 487                                 "scroll_view", 2,
 488                                 GTK_TYPE_SCROLL_TYPE, scroll,
 489                                 G_TYPE_BOOLEAN, horizontal);
 490   gtk_binding_entry_add_signal (binding_set, keypad_keyval, 0,
 491                                 "scroll_view", 2,
 492                                 GTK_TYPE_SCROLL_TYPE, scroll,
 493                                 G_TYPE_BOOLEAN, horizontal);
 494 }
 495
 496 static void
 497 ev_view_scroll_view (EvView *view,
 498                      GtkScrollType scroll,
 499                      gboolean horizontal)
 500 {
 501         if (scroll == GTK_SCROLL_PAGE_BACKWARD) {
 502                 ev_view_set_page (view, ev_view_get_page (view) - 1);
 503         } else if (scroll == GTK_SCROLL_PAGE_FORWARD) {
 504                 ev_view_set_page (view, ev_view_get_page (view) + 1);
 505         } else {
 506                 GtkAdjustment *adjustment;
 507                 double value;
 508
 509                 if (horizontal) {
 510                         adjustment = view->hadjustment;
 511                 } else {
 512                         adjustment = view->vadjustment;
 513                 }
 514
 515                 value = adjustment->value;
 516
 517                 switch (scroll) {
 518                         case GTK_SCROLL_STEP_BACKWARD:
 519                                 value -= adjustment->step_increment;
 520                                 break;
 521                         case GTK_SCROLL_STEP_FORWARD:
 522                                 value += adjustment->step_increment;
 523                                 break;
 524                         default:
 525                                 break;
 526                 }
 527
 528                 value = CLAMP (value, adjustment->lower,
 529                                adjustment->upper - adjustment->page_size);
 530
 531                 gtk_adjustment_set_value (adjustment, value);
 532         }
 533 }
 534
 535 static void
 536 ev_view_class_init (EvViewClass *class)
 537 {
 538         GObjectClass *object_class = G_OBJECT_CLASS (class);
 539         GtkObjectClass *gtk_object_class = GTK_OBJECT_CLASS (class);
 540         GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
 541         GtkBindingSet *binding_set;
 542
 543         object_class->finalize = ev_view_finalize;
 544
 545         widget_class->expose_event = ev_view_expose_event;
 546         widget_class->button_press_event = ev_view_button_press_event;
 547         widget_class->motion_notify_event = ev_view_motion_notify_event;
 548         widget_class->button_release_event = ev_view_button_release_event;
 549         widget_class->size_request = ev_view_size_request;
 550         widget_class->size_allocate = ev_view_size_allocate;
 551         widget_class->realize = ev_view_realize;
 552         widget_class->unrealize = ev_view_unrealize;
 553         widget_class->style_set = ev_view_style_set;
 554         widget_class->state_changed = ev_view_state_changed;
 555         gtk_object_class->destroy = ev_view_destroy;
 556
 557         class->set_scroll_adjustments = ev_view_set_scroll_adjustments;
 558         class->scroll_view = ev_view_scroll_view;
 559
 560         widget_class->set_scroll_adjustments_signal =  g_signal_new ("set-scroll-adjustments",
 561                                                                      G_OBJECT_CLASS_TYPE (object_class),
 562                                                                      G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 563                                                                      G_STRUCT_OFFSET (EvViewClass, set_scroll_adjustments),
 564                                                                      NULL, NULL,
 565                                                                      ev_marshal_VOID__OBJECT_OBJECT,
 566                                                                      G_TYPE_NONE, 2,
 567                                                                      GTK_TYPE_ADJUSTMENT,
 568                                                                      GTK_TYPE_ADJUSTMENT);
 569         page_changed_signal = g_signal_new ("page-changed",
 570                                             G_OBJECT_CLASS_TYPE (object_class),
 571                                             G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 572                                             G_STRUCT_OFFSET (EvViewClass, page_changed),
 573                                             NULL, NULL,
 574                                             ev_marshal_VOID__NONE,
 575                                             G_TYPE_NONE, 0);
 576
 577         g_signal_new ("find-status-changed",
 578                       G_OBJECT_CLASS_TYPE (object_class),
 579                       G_SIGNAL_RUN_LAST,
 580                       0,
 581                       NULL, NULL,
 582                       ev_marshal_VOID__NONE,
 583                       G_TYPE_NONE, 0);
 584
 585         g_signal_new ("scroll_view",
 586                       G_TYPE_FROM_CLASS (object_class),
 587                       G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 588                       G_STRUCT_OFFSET (EvViewClass, scroll_view),
 589                       NULL, NULL,
 590                       ev_marshal_VOID__ENUM_BOOLEAN,
 591                       G_TYPE_NONE, 2,
 592                       GTK_TYPE_SCROLL_TYPE,
 593                       G_TYPE_BOOLEAN);
 594
 595         binding_set = gtk_binding_set_by_class (class);
 596
 597         add_scroll_binding (binding_set, GDK_Left,  GTK_SCROLL_STEP_BACKWARD, TRUE);
 598         add_scroll_binding (binding_set, GDK_Right, GTK_SCROLL_STEP_FORWARD,  TRUE);
 599         add_scroll_binding (binding_set, GDK_Up,    GTK_SCROLL_STEP_BACKWARD, FALSE);
 600         add_scroll_binding (binding_set, GDK_Down,  GTK_SCROLL_STEP_FORWARD,  FALSE);
 601
 602         add_scroll_binding (binding_set, GDK_Page_Up,   GTK_SCROLL_PAGE_BACKWARD, FALSE);
 603         add_scroll_binding (binding_set, GDK_Page_Down, GTK_SCROLL_PAGE_FORWARD,  FALSE);
 604 }
 605
 606 static void
 607 ev_view_init (EvView *view)
 608 {
 609         static const GdkColor white = { 0, 0xffff, 0xffff, 0xffff };
 610
 611         GTK_WIDGET_SET_FLAGS (view, GTK_CAN_FOCUS);
 612
 613         view->scale = 1.0;
 614
 615         gtk_widget_modify_bg (GTK_WIDGET (view), GTK_STATE_NORMAL, &white);
 616
 617         view->find_results = g_array_new (FALSE,
 618                                           FALSE,
 619                                           sizeof (EvFindResult));
 620         view->results_on_this_page = 0;
 621         view->next_page_with_result = 0;
 622 }
 623
 624 static void
 625 update_find_results (EvView *view)
 626 {
 627         const EvFindResult *results;
 628         int i;
 629         int on_this_page;
 630         int next_page_with_result;
 631         int earliest_page_with_result;
 632         int current_page;
 633         gboolean counts_changed;
 634
 635         results = (EvFindResult*) view->find_results->data;
 636         current_page = ev_document_get_page (view->document);
 637         next_page_with_result = 0;
 638         on_this_page = 0;
 639         earliest_page_with_result = 0;
 640
 641         i = 0;
 642         while (i < view->find_results->len) {
 643                 if (results[i].page_num == current_page) {
 644                         ++on_this_page;
 645                 } else {
 646                         int delta = results[i].page_num - current_page;
 647
 648                         if (delta > 0 && /* result on later page */
 649                             (next_page_with_result == 0 ||
 650                              results[i].page_num < next_page_with_result))
 651                                 next_page_with_result = results[i].page_num;
 652
 653                         if (delta < 0 && /* result on a previous page */
 654                             (earliest_page_with_result == 0 ||
 655                              results[i].page_num < earliest_page_with_result))
 656                                 earliest_page_with_result = results[i].page_num;
 657                 }
 658                 ++i;
 659         }
 660
 661         /* If earliest page is just the current page, there is no earliest page */
 662         if (earliest_page_with_result == current_page)
 663                 earliest_page_with_result = 0;
 664
 665         /* If no next page, then wrap and the wrapped page is the next page */
 666         if (next_page_with_result == 0)
 667                 next_page_with_result = earliest_page_with_result;
 668
 669         counts_changed = FALSE;
 670         if (on_this_page != view->results_on_this_page ||
 671             next_page_with_result != view->next_page_with_result) {
 672                 view->results_on_this_page = on_this_page;
 673                 view->next_page_with_result = next_page_with_result;
 674                 counts_changed = TRUE;
 675         }
 676
 677         /* If there are no results at all, then the
 678          * results of ev_view_get_find_status_message() will change
 679          * to reflect the percent_complete so we have to emit the signal
 680          */
 681         if (counts_changed ||
 682             view->find_results->len == 0) {
 683                 g_signal_emit_by_name (view,
 684                                        "find-status-changed");
 685         }
 686 }
 687
 688 static void
 689 found_results_callback (EvDocument         *document,
 690                         const EvFindResult *results,
 691                         int                 n_results,
 692                         double              percent_complete,
 693                         void               *data)
 694 {
 695   EvView *view = EV_VIEW (data);
 696
 697   g_array_set_size (view->find_results, 0);
 698
 699   if (n_results > 0)
 700           g_array_append_vals (view->find_results,
 701                                results, n_results);
 702
 703 #if 0
 704   {
 705           int i;
 706
 707           g_printerr ("%d results %d%%: ", n_results,
 708                       (int) (percent_complete * 100));
 709           i = 0;
 710           while (i < n_results) {
 711                   g_printerr ("%d ", results[i].page_num);
 712                   ++i;
 713           }
 714           g_printerr ("\n");
 715   }
 716 #endif
 717
 718   view->find_percent_complete = percent_complete;
 719   update_find_results (view);
 720
 721   gtk_widget_queue_draw (GTK_WIDGET (view));
 722 }
 723
 724 /*** Public API ***/
 725
 726 GtkWidget*
 727 ev_view_new (void)
 728 {
 729         return g_object_new (EV_TYPE_VIEW, NULL);
 730 }
 731
 732 static void
 733 document_changed_callback (EvDocument *document,
 734                            EvView     *view)
 735 {
 736         gtk_widget_queue_draw (GTK_WIDGET (view));
 737 }
 738
 739 void
 740 ev_view_set_document (EvView     *view,
 741                       EvDocument *document)
 742 {
 743         g_return_if_fail (EV_IS_VIEW (view));
 744
 745         if (document != view->document) {
 746                 int old_page = ev_view_get_page (view);
 747
 748                 if (view->document) {
 749                         g_signal_handlers_disconnect_by_func (view->document,
 750                                                               found_results_callback,
 751                                                               view);
 752                         g_array_set_size (view->find_results, 0);
 753                         view->results_on_this_page = 0;
 754                         view->next_page_with_result = 0;
 755
 756                         g_object_unref (view->document);
 757                 }
 758
 759                 view->document = document;
 760
 761                 if (view->document) {
 762                         g_object_ref (view->document);
 763                         g_signal_connect (view->document,
 764                                           "found",
 765                                           G_CALLBACK (found_results_callback),
 766                                           view);
 767                         g_signal_connect (view->document,
 768                                           "changed",
 769                                           G_CALLBACK (document_changed_callback),
 770                                           view);
 771                 }
 772
 773                 if (GTK_WIDGET_REALIZED (view))
 774                         ev_document_set_target (view->document, view->bin_window);
 775
 776                 gtk_widget_queue_resize (GTK_WIDGET (view));
 777
 778                 if (old_page != ev_view_get_page (view))
 779                         g_signal_emit (view, page_changed_signal, 0);
 780         }
 781 }
 782
 783 void
 784 ev_view_set_page (EvView *view,
 785                   int     page)
 786 {
 787         if (view->document) {
 788                 int old_page = ev_document_get_page (view->document);
 789                 if (old_page != page)
 790                         ev_document_set_page (view->document, page);
 791                 if (old_page != ev_document_get_page (view->document)) {
 792                         g_signal_emit (view, page_changed_signal, 0);
 793
 794                         view->find_percent_complete = 0.0;
 795                         update_find_results (view);
 796                 }
 797         }
 798 }
 799
 800 int
 801 ev_view_get_page (EvView *view)
 802 {
 803         if (view->document)
 804                 return ev_document_get_page (view->document);
 805         else
 806                 return 1;
 807 }
 808
 809 #define ZOOM_IN_FACTOR  1.2
 810 #define ZOOM_OUT_FACTOR (1.0/ZOOM_IN_FACTOR)
 811
 812 #define MIN_SCALE 0.05409
 813 #define MAX_SCALE 18.4884
 814
 815 static void
 816 ev_view_zoom (EvView   *view,
 817               double    factor,
 818               gboolean  relative)
 819 {
 820         double scale;
 821
 822         if (relative)
 823                 scale = view->scale * factor;
 824         else
 825                 scale = factor;
 826
 827         view->scale = CLAMP (scale, MIN_SCALE, MAX_SCALE);
 828
 829         ev_document_set_scale (view->document, view->scale);
 830
 831         gtk_widget_queue_resize (GTK_WIDGET (view));
 832 }
 833
 834 void
 835 ev_view_zoom_in (EvView *view)
 836 {
 837         ev_view_zoom (view, ZOOM_IN_FACTOR, TRUE);
 838 }
 839
 840 void
 841 ev_view_zoom_out (EvView *view)
 842 {
 843         ev_view_zoom (view, ZOOM_OUT_FACTOR, TRUE);
 844 }
 845
 846 void
 847 ev_view_normal_size (EvView *view)
 848 {
 849         ev_view_zoom (view, 1.0, FALSE);
 850 }
 851
 852 void
 853 ev_view_best_fit (EvView *view)
 854 {
 855         double scale;
 856         int width, height;
 857
 858         width = height = 0;
 859         ev_document_get_page_size (view->document, &width, &height);
 860
 861         scale = 1.0;
 862         if (width != 0 && height != 0) {
 863                 double scale_w, scale_h;
 864
 865                 scale_w = (double)GTK_WIDGET (view)->allocation.width * view->scale / width;
 866                 scale_h = (double)GTK_WIDGET (view)->allocation.height * view->scale / height;
 867
 868                 scale = (scale_w < scale_h) ? scale_w : scale_h;
 869         }
 870
 871         ev_view_zoom (view, scale, FALSE);
 872 }
 873
 874 void
 875 ev_view_fit_width (EvView *view)
 876 {
 877         double scale = 1.0;
 878         int width;
 879
 880         width = 0;
 881         ev_document_get_page_size (view->document, &width, NULL);
 882
 883         scale = 1.0;
 884         if (width != 0)
 885                 scale = (double)GTK_WIDGET (view)->allocation.width * view->scale / width;
 886
 887         ev_view_zoom (view, scale, FALSE);
 888 }
 889
 890 char*
 891 ev_view_get_find_status_message (EvView *view)
 892 {
 893         if (view->find_results->len == 0) {
 894                 if (view->find_percent_complete >= (1.0 - 1e-10)) {
 895                         return g_strdup (_("Not found"));
 896                 } else {
 897                         return g_strdup_printf (_("%3d%% remaining to search"),
 898                                                 (int) ((1.0 - view->find_percent_complete) * 100));
 899                 }
 900         } else if (view->results_on_this_page == 0) {
 901                 g_assert (view->next_page_with_result != 0);
 902                 return g_strdup_printf (_("Found on page %d"),
 903                                         view->next_page_with_result);
 904         } else {
 905                 return g_strdup_printf (_("%d found on this page"),
 906                                         view->results_on_this_page);
 907         }
 908 }