shell/ev-view.c

   1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8; c-indent-level: 8 -*- */
   2 /* this file is part of evince, a gnome document viewer
   3  *
   4  *  Copyright (C) 2004 Red Hat, Inc
   5  *
   6  * Evince is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * Evince is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include <gtk/gtkalignment.h>
  22 #include <glib/gi18n.h>
  23 #include <gtk/gtkbindings.h>
  24 #include <gtk/gtkselection.h>
  25 #include <gtk/gtkclipboard.h>
  26 #include <gdk/gdkkeysyms.h>
  27 #include <libgnomevfs/gnome-vfs-utils.h>
  28
  29 #include "ev-marshal.h"
  30 #include "ev-view.h"
  31 #include "ev-document-find.h"
  32
  33 #define EV_VIEW_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), EV_TYPE_VIEW, EvViewClass))
  34 #define EV_IS_VIEW_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), EV_TYPE_VIEW))
  35 #define EV_VIEW_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), EV_TYPE_VIEW, EvViewClass))
  36
  37 enum {
  38         PROP_0,
  39         PROP_STATUS,
  40         PROP_FIND_STATUS
  41 };
  42
  43 enum {
  44   TARGET_STRING,
  45   TARGET_TEXT,
  46   TARGET_COMPOUND_TEXT,
  47   TARGET_UTF8_STRING,
  48   TARGET_TEXT_BUFFER_CONTENTS
  49 };
  50
  51 static const GtkTargetEntry targets[] = {
  52         { "STRING", 0, TARGET_STRING },
  53         { "TEXT",   0, TARGET_TEXT },
  54         { "COMPOUND_TEXT", 0, TARGET_COMPOUND_TEXT },
  55         { "UTF8_STRING", 0, TARGET_UTF8_STRING },
  56 };
  57
  58 typedef enum {
  59         EV_VIEW_CURSOR_NORMAL,
  60         EV_VIEW_CURSOR_LINK,
  61         EV_VIEW_CURSOR_WAIT
  62 } EvViewCursor;
  63
  64 struct _EvView {
  65         GtkWidget parent_instance;
  66
  67         EvDocument *document;
  68         EvHistory  *history;
  69
  70         GdkWindow *bin_window;
  71
  72         char *status;
  73         char *find_status;
  74
  75         int scroll_x;
  76         int scroll_y;
  77
  78         gboolean pressed_button;
  79         gboolean has_selection;
  80         GdkRectangle selection;
  81         EvViewCursor cursor;
  82
  83         GtkAdjustment *hadjustment;
  84         GtkAdjustment *vadjustment;
  85
  86         GArray *find_results;
  87         int results_on_this_page;
  88         int next_page_with_result;
  89         double find_percent_complete;
  90
  91         double scale;
  92 };
  93
  94 struct _EvViewClass {
  95         GtkWidgetClass parent_class;
  96
  97         void    (*set_scroll_adjustments) (EvView         *view,
  98                                            GtkAdjustment  *hadjustment,
  99                                            GtkAdjustment  *vadjustment);
 100         void    (*scroll_view)            (EvView         *view,
 101                                            GtkScrollType   scroll,
 102                                            gboolean        horizontal);
 103
 104         /* Should this be notify::page? */
 105         void    (*page_changed)           (EvView         *view);
 106 };
 107
 108 static guint page_changed_signal = 0;
 109
 110 static void ev_view_set_scroll_adjustments (EvView         *view,
 111                                             GtkAdjustment  *hadjustment,
 112                                             GtkAdjustment  *vadjustment);
 113
 114 G_DEFINE_TYPE (EvView, ev_view, GTK_TYPE_WIDGET)
 115
 116 /*** Helper functions ***/
 117
 118 static void
 119 view_update_adjustments (EvView *view)
 120 {
 121         int old_x = view->scroll_x;
 122         int old_y = view->scroll_y;
 123
 124         if (view->hadjustment)
 125                 view->scroll_x = view->hadjustment->value;
 126         else
 127                 view->scroll_x = 0;
 128
 129         if (view->vadjustment)
 130                 view->scroll_y = view->vadjustment->value;
 131         else
 132                 view->scroll_y = 0;
 133
 134         if (GTK_WIDGET_REALIZED (view) &&
 135             (view->scroll_x != old_x || view->scroll_y != old_y)) {
 136                 gdk_window_move (view->bin_window, - view->scroll_x, - view->scroll_y);
 137                 gdk_window_process_updates (view->bin_window, TRUE);
 138         }
 139 }
 140
 141 static void
 142 view_set_adjustment_values (EvView         *view,
 143                             GtkOrientation  orientation)
 144 {
 145         GtkWidget *widget = GTK_WIDGET (view);
 146         GtkAdjustment *adjustment;
 147         gboolean value_changed = FALSE;
 148         int requisition;
 149         int allocation;
 150
 151         if (orientation == GTK_ORIENTATION_HORIZONTAL)  {
 152                 requisition = widget->requisition.width;
 153                 allocation = widget->allocation.width;
 154                 adjustment = view->hadjustment;
 155         } else {
 156                 requisition = widget->requisition.height;
 157                 allocation = widget->allocation.height;
 158                 adjustment = view->vadjustment;
 159         }
 160
 161         if (!adjustment)
 162                 return;
 163
 164         adjustment->page_size = allocation;
 165         adjustment->step_increment = allocation * 0.1;
 166         adjustment->page_increment = allocation * 0.9;
 167         adjustment->lower = 0;
 168         adjustment->upper = MAX (allocation, requisition);
 169
 170         if (adjustment->value > adjustment->upper - adjustment->page_size) {
 171                 adjustment->value = adjustment->upper - adjustment->page_size;
 172                 value_changed = TRUE;
 173         }
 174
 175         gtk_adjustment_changed (adjustment);
 176         if (value_changed)
 177                 gtk_adjustment_value_changed (adjustment);
 178 }
 179
 180 /*** Virtual function implementations ***/
 181
 182 static void
 183 ev_view_finalize (GObject *object)
 184 {
 185         EvView *view = EV_VIEW (object);
 186
 187         if (view->document)
 188                 g_object_unref (view->document);
 189
 190         if (view->history)
 191                 g_object_unref (view->history);
 192
 193         ev_view_set_scroll_adjustments (view, NULL, NULL);
 194
 195         g_array_free (view->find_results, TRUE);
 196         view->find_results = NULL;
 197
 198         G_OBJECT_CLASS (ev_view_parent_class)->finalize (object);
 199 }
 200
 201 static void
 202 ev_view_destroy (GtkObject *object)
 203 {
 204         EvView *view = EV_VIEW (object);
 205
 206         ev_view_set_scroll_adjustments (view, NULL, NULL);
 207
 208         GTK_OBJECT_CLASS (ev_view_parent_class)->destroy (object);
 209 }
 210
 211 static void
 212 ev_view_size_request (GtkWidget      *widget,
 213                       GtkRequisition *requisition)
 214 {
 215         EvView *view = EV_VIEW (widget);
 216
 217         if (GTK_WIDGET_REALIZED (widget)) {
 218                 if (view->document) {
 219                         ev_document_get_page_size (view->document,
 220                                                    &requisition->width,
 221                                                    &requisition->height);
 222                 } else {
 223                         requisition->width = 10;
 224                         requisition->height = 10;
 225                 }
 226         }
 227
 228 }
 229
 230 static void
 231 ev_view_size_allocate (GtkWidget      *widget,
 232                        GtkAllocation  *allocation)
 233 {
 234         EvView *view = EV_VIEW (widget);
 235
 236         GTK_WIDGET_CLASS (ev_view_parent_class)->size_allocate (widget, allocation);
 237
 238         view_set_adjustment_values (view, GTK_ORIENTATION_HORIZONTAL);
 239         view_set_adjustment_values (view, GTK_ORIENTATION_VERTICAL);
 240
 241         if (GTK_WIDGET_REALIZED (widget)) {
 242                 gdk_window_resize (view->bin_window,
 243                                    MAX (widget->allocation.width, widget->requisition.width),
 244                                    MAX (widget->allocation.height, widget->requisition.height));
 245         }
 246 }
 247
 248 static void
 249 update_window_backgrounds (EvView *view)
 250 {
 251         GtkWidget *widget = GTK_WIDGET (view);
 252
 253         if (GTK_WIDGET_REALIZED (view)) {
 254                 gdk_window_set_background (view->bin_window,
 255                                            &widget->style->base[GTK_WIDGET_STATE (widget)]);
 256         }
 257 }
 258
 259 static void
 260 ev_view_realize (GtkWidget *widget)
 261 {
 262         EvView *view = EV_VIEW (widget);
 263         GdkWindowAttr attributes;
 264
 265         GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 266
 267         attributes.window_type = GDK_WINDOW_CHILD;
 268         attributes.wclass = GDK_INPUT_OUTPUT;
 269         attributes.visual = gtk_widget_get_visual (widget);
 270         attributes.colormap = gtk_widget_get_colormap (widget);
 271
 272         attributes.x = widget->allocation.x;
 273         attributes.y = widget->allocation.y;
 274         attributes.width = widget->allocation.width;
 275         attributes.height = widget->allocation.height;
 276         attributes.event_mask = 0;
 277
 278         widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
 279                                          &attributes,
 280                                          GDK_WA_X | GDK_WA_Y |
 281                                          GDK_WA_COLORMAP |
 282                                          GDK_WA_VISUAL);
 283         gdk_window_set_user_data (widget->window, widget);
 284         widget->style = gtk_style_attach (widget->style, widget->window);
 285
 286         attributes.x = 0;
 287         attributes.y = 0;
 288         attributes.width = MAX (widget->allocation.width, widget->requisition.width);
 289         attributes.height = MAX (widget->allocation.height, widget->requisition.height);
 290         attributes.event_mask = GDK_EXPOSURE_MASK |
 291                                 GDK_BUTTON_PRESS_MASK |
 292                                 GDK_BUTTON_RELEASE_MASK |
 293                                 GDK_SCROLL_MASK |
 294                                 GDK_KEY_PRESS_MASK |
 295                                 GDK_POINTER_MOTION_MASK;
 296
 297         view->bin_window = gdk_window_new (widget->window,
 298                                            &attributes,
 299                                            GDK_WA_X | GDK_WA_Y |
 300                                            GDK_WA_COLORMAP |
 301                                            GDK_WA_VISUAL);
 302         gdk_window_set_user_data (view->bin_window, widget);
 303         gdk_window_show (view->bin_window);
 304
 305         if (view->document) {
 306                 ev_document_set_target (view->document, view->bin_window);
 307
 308                 /* We can't get page size without a target, so we have to
 309                  * queue a size request at realization. Could be fixed
 310                  * with EvDocument changes to allow setting a GdkScreen
 311                  * without setting a target.
 312                  */
 313                 gtk_widget_queue_resize (widget);
 314         }
 315
 316         update_window_backgrounds (view);
 317 }
 318
 319 static void
 320 ev_view_unrealize (GtkWidget *widget)
 321 {
 322         EvView *view = EV_VIEW (widget);
 323
 324         if (view->document)
 325                 ev_document_set_target (view->document, NULL);
 326
 327         gdk_window_set_user_data (view->bin_window, NULL);
 328         gdk_window_destroy (view->bin_window);
 329         view->bin_window = NULL;
 330
 331         GTK_WIDGET_CLASS (ev_view_parent_class)->unrealize (widget);
 332 }
 333
 334 static void
 335 ev_view_style_set (GtkWidget      *widget,
 336                    GtkStyle       *previous_style)
 337 {
 338         update_window_backgrounds (EV_VIEW (widget));
 339 }
 340
 341 static void
 342 ev_view_state_changed (GtkWidget    *widget,
 343                        GtkStateType  previous_state)
 344 {
 345         update_window_backgrounds (EV_VIEW (widget));
 346 }
 347
 348 static guint32
 349 ev_gdk_color_to_rgb (const GdkColor *color)
 350 {
 351   guint32 result;
 352   result = (0xff0000 | (color->red & 0xff00));
 353   result <<= 8;
 354   result |= ((color->green & 0xff00) | (color->blue >> 8));
 355   return result;
 356 }
 357
 358 static void
 359 draw_rubberband (GtkWidget *widget, GdkWindow *window, const GdkRectangle *rect)
 360 {
 361         GdkGC *gc;
 362         GdkPixbuf *pixbuf;
 363         GdkColor *fill_color_gdk;
 364         guint fill_color;
 365
 366         fill_color_gdk = gdk_color_copy (&GTK_WIDGET (widget)->style->base[GTK_STATE_SELECTED]);
 367         fill_color = ev_gdk_color_to_rgb (fill_color_gdk) << 8 | 0x40;
 368
 369         pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8,
 370                                  rect->width, rect->height);
 371         gdk_pixbuf_fill (pixbuf, fill_color);
 372
 373         gdk_draw_pixbuf (window, NULL, pixbuf,
 374                          0, 0,
 375                          rect->x,rect->y,
 376                          rect->width, rect->height,
 377                          GDK_RGB_DITHER_NONE,
 378                          0, 0);
 379
 380         g_object_unref (pixbuf);
 381
 382         gc = gdk_gc_new (window);
 383         gdk_gc_set_rgb_fg_color (gc, fill_color_gdk);
 384         gdk_draw_rectangle (window, gc, FALSE,
 385                             rect->x, rect->y,
 386                             rect->width - 1,
 387                             rect->height - 1);
 388         g_object_unref (gc);
 389
 390         gdk_color_free (fill_color_gdk);
 391 }
 392
 393 static void
 394 expose_bin_window (GtkWidget      *widget,
 395                    GdkEventExpose *event)
 396 {
 397         EvView *view = EV_VIEW (widget);
 398         int i;
 399         int current_page;
 400         const EvFindResult *results;
 401
 402         if (view->document == NULL)
 403                 return;
 404
 405         ev_document_render (view->document,
 406                             event->area.x, event->area.y,
 407                             event->area.width, event->area.height);
 408
 409         results = (EvFindResult*) view->find_results->data;
 410         current_page = ev_document_get_page (view->document);
 411         i = 0;
 412         while (i < view->find_results->len) {
 413 #if 0
 414                 g_printerr ("highlighting result %d page %d at %d,%d %dx%d\n",
 415                             i, results[i].page_num,
 416                             results[i].highlight_area.x,
 417                             results[i].highlight_area.y,
 418                             results[i].highlight_area.width,
 419                             results[i].highlight_area.height);
 420 #endif
 421                 if (results[i].page_num == current_page)
 422                         draw_rubberband (widget, view->bin_window,
 423                                          &results[i].highlight_area);
 424                 ++i;
 425         }
 426
 427         if (view->has_selection) {
 428                 draw_rubberband (widget, view->bin_window, &view->selection);
 429         }
 430 }
 431
 432 static gboolean
 433 ev_view_expose_event (GtkWidget      *widget,
 434                       GdkEventExpose *event)
 435 {
 436         EvView *view = EV_VIEW (widget);
 437
 438         if (event->window == view->bin_window)
 439                 expose_bin_window (widget, event);
 440         else
 441                 return GTK_WIDGET_CLASS (ev_view_parent_class)->expose_event (widget, event);
 442
 443         return FALSE;
 444 }
 445
 446 void
 447 ev_view_select_all (EvView *ev_view)
 448 {
 449         GtkWidget *widget = GTK_WIDGET (ev_view);
 450
 451         g_return_if_fail (EV_IS_VIEW (ev_view));
 452
 453         ev_view->has_selection = TRUE;
 454         ev_view->selection.x = ev_view->selection.y = 0;
 455         ev_view->selection.width = widget->requisition.width;
 456         ev_view->selection.height = widget->requisition.height;
 457
 458         gtk_widget_queue_draw (widget);
 459 }
 460
 461 void
 462 ev_view_copy (EvView *ev_view)
 463 {
 464         GtkClipboard *clipboard;
 465         char *text;
 466
 467         text = ev_document_get_text (ev_view->document, &ev_view->selection);
 468         clipboard = gtk_widget_get_clipboard (GTK_WIDGET (ev_view),
 469                                               GDK_SELECTION_CLIPBOARD);
 470         gtk_clipboard_set_text (clipboard, text, -1);
 471         g_free (text);
 472 }
 473
 474 static void
 475 ev_view_primary_get_cb (GtkClipboard     *clipboard,
 476                         GtkSelectionData *selection_data,
 477                         guint             info,
 478                         gpointer          data)
 479 {
 480         EvView *ev_view = EV_VIEW (data);
 481         char *text;
 482
 483         text = ev_document_get_text (ev_view->document, &ev_view->selection);
 484         gtk_selection_data_set_text (selection_data, text, -1);
 485 }
 486
 487 static void
 488 ev_view_primary_clear_cb (GtkClipboard *clipboard,
 489                           gpointer      data)
 490 {
 491         EvView *ev_view = EV_VIEW (data);
 492
 493         ev_view->has_selection = FALSE;
 494 }
 495
 496 static void
 497 ev_view_update_primary_selection (EvView *ev_view)
 498 {
 499         GtkClipboard *clipboard;
 500
 501         clipboard = gtk_widget_get_clipboard (GTK_WIDGET (ev_view),
 502                                               GDK_SELECTION_PRIMARY);
 503
 504         if (ev_view->has_selection) {
 505                 if (!gtk_clipboard_set_with_owner (clipboard,
 506                                                    targets,
 507                                                    G_N_ELEMENTS (targets),
 508                                                    ev_view_primary_get_cb,
 509                                                    ev_view_primary_clear_cb,
 510                                                    G_OBJECT (ev_view)))
 511                         ev_view_primary_clear_cb (clipboard, ev_view);
 512         } else {
 513                 if (gtk_clipboard_get_owner (clipboard) == G_OBJECT (ev_view))
 514                         gtk_clipboard_clear (clipboard);
 515         }
 516 }
 517
 518 static gboolean
 519 ev_view_button_press_event (GtkWidget      *widget,
 520                             GdkEventButton *event)
 521 {
 522         EvView *view = EV_VIEW (widget);
 523
 524         if (!GTK_WIDGET_HAS_FOCUS (widget)) {
 525                 gtk_widget_grab_focus (widget);
 526         }
 527
 528         view->pressed_button = event->button;
 529
 530         switch (event->button) {
 531                 case 1:
 532                         if (view->has_selection) {
 533                                 view->has_selection = FALSE;
 534                                 gtk_widget_queue_draw (widget);
 535                         }
 536
 537                         view->selection.x = event->x;
 538                         view->selection.y = event->y;
 539                         view->selection.width = 0;
 540                         view->selection.height = 0;
 541                         break;
 542         }
 543
 544         return TRUE;
 545 }
 546
 547 static char *
 548 status_message_from_link (EvLink *link)
 549 {
 550         EvLinkType type;
 551         char *msg;
 552         int page;
 553
 554         type = ev_link_get_link_type (link);
 555
 556         switch (type) {
 557                 case EV_LINK_TYPE_TITLE:
 558                         msg = g_strdup (ev_link_get_title (link));
 559                         break;
 560                 case EV_LINK_TYPE_PAGE:
 561                         page = ev_link_get_page (link);
 562                         msg = g_strdup_printf (_("Go to page %d"), page);
 563                         break;
 564                 case EV_LINK_TYPE_EXTERNAL_URI:
 565                         msg = g_strdup (ev_link_get_uri (link));
 566                         break;
 567                 default:
 568                         msg = NULL;
 569         }
 570
 571         return msg;
 572 }
 573
 574 static void
 575 ev_view_set_status (EvView *view, const char *message)
 576 {
 577         g_return_if_fail (EV_IS_VIEW (view));
 578
 579         if (message != view->status) {
 580                 g_free (view->status);
 581                 view->status = g_strdup (message);
 582                 g_object_notify (G_OBJECT (view), "status");
 583         }
 584 }
 585
 586 static void
 587 ev_view_set_find_status (EvView *view, const char *message)
 588 {
 589         g_return_if_fail (EV_IS_VIEW (view));
 590
 591         g_free (view->find_status);
 592         view->find_status = g_strdup (message);
 593         g_object_notify (G_OBJECT (view), "find-status");
 594 }
 595
 596 static void
 597 ev_view_set_cursor (EvView *view, EvViewCursor new_cursor)
 598 {
 599         GdkCursor *cursor = NULL;
 600         GdkDisplay *display;
 601         GtkWidget *widget;
 602
 603         if (view->cursor == new_cursor) {
 604                 return;
 605         }
 606
 607         widget = gtk_widget_get_toplevel (GTK_WIDGET (view));
 608         display = gtk_widget_get_display (widget);
 609         view->cursor = new_cursor;
 610
 611         switch (new_cursor) {
 612                 case EV_VIEW_CURSOR_NORMAL:
 613                         gdk_window_set_cursor (widget->window, NULL);
 614                         break;
 615                 case EV_VIEW_CURSOR_LINK:
 616                         cursor = gdk_cursor_new_for_display (display, GDK_HAND2);
 617                         break;
 618                 case EV_VIEW_CURSOR_WAIT:
 619                         cursor = gdk_cursor_new_for_display (display, GDK_WATCH);
 620                         break;
 621         }
 622
 623         if (cursor) {
 624                 gdk_window_set_cursor (widget->window, cursor);
 625                 gdk_cursor_unref (cursor);
 626                 gdk_flush();
 627         }
 628 }
 629
 630 static gboolean
 631 ev_view_motion_notify_event (GtkWidget      *widget,
 632                              GdkEventMotion *event)
 633 {
 634         EvView *view = EV_VIEW (widget);
 635
 636         if (view->pressed_button > 0) {
 637                 view->has_selection = TRUE;
 638                 view->selection.x = MIN (view->selection.x, event->x);
 639                 view->selection.y = MIN (view->selection.y, event->y);
 640                 view->selection.width = ABS (view->selection.x - event->x) + 1;
 641                 view->selection.height = ABS (view->selection.y - event->y) + 1;
 642         } else if (view->document) {
 643                 EvLink *link;
 644
 645                 link = ev_document_get_link (view->document, event->x, event->y);
 646                 if (link) {
 647                         char *msg;
 648
 649                         msg = status_message_from_link (link);
 650                         ev_view_set_status (view, msg);
 651                         ev_view_set_cursor (view, EV_VIEW_CURSOR_LINK);
 652                         g_free (msg);
 653
 654                         g_object_unref (link);
 655                 } else {
 656                         ev_view_set_status (view, NULL);
 657                         if (view->cursor == EV_VIEW_CURSOR_LINK) {
 658                                 ev_view_set_cursor (view, EV_VIEW_CURSOR_NORMAL);
 659                         }
 660                 }
 661         }
 662
 663         gtk_widget_queue_draw (widget);
 664
 665         return TRUE;
 666 }
 667
 668 static gboolean
 669 ev_view_button_release_event (GtkWidget      *widget,
 670                               GdkEventButton *event)
 671 {
 672         EvView *view = EV_VIEW (widget);
 673
 674         view->pressed_button = -1;
 675
 676         if (view->has_selection) {
 677                 ev_view_update_primary_selection (view);
 678         } else if (view->document) {
 679                 EvLink *link;
 680
 681                 link = ev_document_get_link (view->document,
 682                                              event->x,
 683                                              event->y);
 684                 if (link) {
 685                         ev_view_go_to_link (view, link);
 686                         g_object_unref (link);
 687                 }
 688         }
 689
 690         return FALSE;
 691 }
 692
 693 static void
 694 on_adjustment_value_changed (GtkAdjustment  *adjustment,
 695                              EvView *view)
 696 {
 697         view_update_adjustments (view);
 698 }
 699
 700 static void
 701 set_scroll_adjustment (EvView *view,
 702                        GtkOrientation  orientation,
 703                        GtkAdjustment  *adjustment)
 704 {
 705         GtkAdjustment **to_set;
 706
 707         if (orientation == GTK_ORIENTATION_HORIZONTAL)
 708                 to_set = &view->hadjustment;
 709         else
 710                 to_set = &view->vadjustment;
 711
 712         if (*to_set != adjustment) {
 713                 if (*to_set) {
 714                         g_signal_handlers_disconnect_by_func (*to_set,
 715                                                               (gpointer) on_adjustment_value_changed,
 716                                                               view);
 717                         g_object_unref (*to_set);
 718                 }
 719
 720                 *to_set = adjustment;
 721                 view_set_adjustment_values (view, orientation);
 722
 723                 if (*to_set) {
 724                         g_object_ref (*to_set);
 725                         g_signal_connect (*to_set, "value_changed",
 726                                           G_CALLBACK (on_adjustment_value_changed), view);
 727                 }
 728         }
 729 }
 730
 731 static void
 732 ev_view_set_scroll_adjustments (EvView *view,
 733                                 GtkAdjustment  *hadjustment,
 734                                 GtkAdjustment  *vadjustment)
 735 {
 736         set_scroll_adjustment (view, GTK_ORIENTATION_HORIZONTAL, hadjustment);
 737         set_scroll_adjustment (view, GTK_ORIENTATION_VERTICAL, vadjustment);
 738
 739         view_update_adjustments (view);
 740 }
 741
 742 static void
 743 add_scroll_binding (GtkBindingSet  *binding_set,
 744                     guint           keyval,
 745                     GtkScrollType   scroll,
 746                     gboolean        horizontal)
 747 {
 748   guint keypad_keyval = keyval - GDK_Left + GDK_KP_Left;
 749
 750   gtk_binding_entry_add_signal (binding_set, keyval, 0,
 751                                 "scroll_view", 2,
 752                                 GTK_TYPE_SCROLL_TYPE, scroll,
 753                                 G_TYPE_BOOLEAN, horizontal);
 754   gtk_binding_entry_add_signal (binding_set, keypad_keyval, 0,
 755                                 "scroll_view", 2,
 756                                 GTK_TYPE_SCROLL_TYPE, scroll,
 757                                 G_TYPE_BOOLEAN, horizontal);
 758 }
 759
 760 static void
 761 ev_view_scroll_view (EvView *view,
 762                      GtkScrollType scroll,
 763                      gboolean horizontal)
 764 {
 765         if (scroll == GTK_SCROLL_PAGE_BACKWARD) {
 766                 ev_view_set_page (view, ev_view_get_page (view) - 1);
 767         } else if (scroll == GTK_SCROLL_PAGE_FORWARD) {
 768                 ev_view_set_page (view, ev_view_get_page (view) + 1);
 769         } else {
 770                 GtkAdjustment *adjustment;
 771                 double value;
 772
 773                 if (horizontal) {
 774                         adjustment = view->hadjustment;
 775                 } else {
 776                         adjustment = view->vadjustment;
 777                 }
 778
 779                 value = adjustment->value;
 780
 781                 switch (scroll) {
 782                         case GTK_SCROLL_STEP_BACKWARD:
 783                                 value -= adjustment->step_increment;
 784                                 break;
 785                         case GTK_SCROLL_STEP_FORWARD:
 786                                 value += adjustment->step_increment;
 787                                 break;
 788                         default:
 789                                 break;
 790                 }
 791
 792                 value = CLAMP (value, adjustment->lower,
 793                                adjustment->upper - adjustment->page_size);
 794
 795                 gtk_adjustment_set_value (adjustment, value);
 796         }
 797 }
 798
 799 static void
 800 ev_view_set_property (GObject *object,
 801                       guint prop_id,
 802                       const GValue *value,
 803                       GParamSpec *pspec)
 804 {
 805         switch (prop_id)
 806         {
 807                 /* Read only */
 808                 case PROP_STATUS:
 809                 case PROP_FIND_STATUS:
 810                         break;
 811         }
 812 }
 813
 814 static void
 815 ev_view_get_property (GObject *object,
 816                       guint prop_id,
 817                       GValue *value,
 818                       GParamSpec *pspec)
 819 {
 820         EvView *view = EV_VIEW (object);
 821
 822         switch (prop_id)
 823         {
 824                 case PROP_STATUS:
 825                         g_value_set_string (value, view->status);
 826                         break;
 827                 case PROP_FIND_STATUS:
 828                         g_value_set_string (value, view->status);
 829                         break;
 830         }
 831 }
 832
 833 static void
 834 ev_view_class_init (EvViewClass *class)
 835 {
 836         GObjectClass *object_class = G_OBJECT_CLASS (class);
 837         GtkObjectClass *gtk_object_class = GTK_OBJECT_CLASS (class);
 838         GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
 839         GtkBindingSet *binding_set;
 840
 841         object_class->finalize = ev_view_finalize;
 842         object_class->set_property = ev_view_set_property;
 843         object_class->get_property = ev_view_get_property;
 844
 845         widget_class->expose_event = ev_view_expose_event;
 846         widget_class->button_press_event = ev_view_button_press_event;
 847         widget_class->motion_notify_event = ev_view_motion_notify_event;
 848         widget_class->button_release_event = ev_view_button_release_event;
 849         widget_class->size_request = ev_view_size_request;
 850         widget_class->size_allocate = ev_view_size_allocate;
 851         widget_class->realize = ev_view_realize;
 852         widget_class->unrealize = ev_view_unrealize;
 853         widget_class->style_set = ev_view_style_set;
 854         widget_class->state_changed = ev_view_state_changed;
 855         gtk_object_class->destroy = ev_view_destroy;
 856
 857         class->set_scroll_adjustments = ev_view_set_scroll_adjustments;
 858         class->scroll_view = ev_view_scroll_view;
 859
 860         widget_class->set_scroll_adjustments_signal =  g_signal_new ("set-scroll-adjustments",
 861                                                                      G_OBJECT_CLASS_TYPE (object_class),
 862                                                                      G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 863                                                                      G_STRUCT_OFFSET (EvViewClass, set_scroll_adjustments),
 864                                                                      NULL, NULL,
 865                                                                      ev_marshal_VOID__OBJECT_OBJECT,
 866                                                                      G_TYPE_NONE, 2,
 867                                                                      GTK_TYPE_ADJUSTMENT,
 868                                                                      GTK_TYPE_ADJUSTMENT);
 869         page_changed_signal = g_signal_new ("page-changed",
 870                                             G_OBJECT_CLASS_TYPE (object_class),
 871                                             G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 872                                             G_STRUCT_OFFSET (EvViewClass, page_changed),
 873                                             NULL, NULL,
 874                                             ev_marshal_VOID__NONE,
 875                                             G_TYPE_NONE, 0);
 876
 877         g_signal_new ("scroll_view",
 878                       G_TYPE_FROM_CLASS (object_class),
 879                       G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 880                       G_STRUCT_OFFSET (EvViewClass, scroll_view),
 881                       NULL, NULL,
 882                       ev_marshal_VOID__ENUM_BOOLEAN,
 883                       G_TYPE_NONE, 2,
 884                       GTK_TYPE_SCROLL_TYPE,
 885                       G_TYPE_BOOLEAN);
 886
 887         g_object_class_install_property (object_class,
 888                                          PROP_STATUS,
 889                                          g_param_spec_string ("status",
 890                                                               "Status Message",
 891                                                               "The status message",
 892                                                               NULL,
 893                                                               G_PARAM_READABLE));
 894
 895         g_object_class_install_property (object_class,
 896                                          PROP_STATUS,
 897                                          g_param_spec_string ("find-status",
 898                                                               "Find Status Message",
 899                                                               "The find status message",
 900                                                               NULL,
 901                                                               G_PARAM_READABLE));
 902
 903         binding_set = gtk_binding_set_by_class (class);
 904
 905         add_scroll_binding (binding_set, GDK_Left,  GTK_SCROLL_STEP_BACKWARD, TRUE);
 906         add_scroll_binding (binding_set, GDK_Right, GTK_SCROLL_STEP_FORWARD,  TRUE);
 907         add_scroll_binding (binding_set, GDK_Up,    GTK_SCROLL_STEP_BACKWARD, FALSE);
 908         add_scroll_binding (binding_set, GDK_Down,  GTK_SCROLL_STEP_FORWARD,  FALSE);
 909
 910         add_scroll_binding (binding_set, GDK_Page_Up,   GTK_SCROLL_PAGE_BACKWARD, FALSE);
 911         add_scroll_binding (binding_set, GDK_Page_Down, GTK_SCROLL_PAGE_FORWARD,  FALSE);
 912 }
 913
 914 static void
 915 ev_view_init (EvView *view)
 916 {
 917         static const GdkColor white = { 0, 0xffff, 0xffff, 0xffff };
 918
 919         GTK_WIDGET_SET_FLAGS (view, GTK_CAN_FOCUS);
 920
 921         view->scale = 1.0;
 922         view->pressed_button = -1;
 923         view->cursor = EV_VIEW_CURSOR_NORMAL;
 924
 925         gtk_widget_modify_bg (GTK_WIDGET (view), GTK_STATE_NORMAL, &white);
 926
 927         view->find_results = g_array_new (FALSE,
 928                                           FALSE,
 929                                           sizeof (EvFindResult));
 930         view->results_on_this_page = 0;
 931         view->next_page_with_result = 0;
 932 }
 933
 934 static char *
 935 ev_view_get_find_status_message (EvView *view)
 936 {
 937         if (view->find_results->len == 0) {
 938                 if (view->find_percent_complete >= (1.0 - 1e-10)) {
 939                         return g_strdup (_("Not found"));
 940                 } else {
 941                         return g_strdup_printf (_("%3d%% remaining to search"),
 942                                                 (int) ((1.0 - view->find_percent_complete) * 100));
 943                 }
 944         } else if (view->results_on_this_page == 0) {
 945                 g_assert (view->next_page_with_result != 0);
 946                 return g_strdup_printf (_("Found on page %d"),
 947                                         view->next_page_with_result);
 948         } else {
 949                 return g_strdup_printf (_("%d found on this page"),
 950                                         view->results_on_this_page);
 951         }
 952 }
 953
 954 static void
 955 update_find_results (EvView *view)
 956 {
 957         const EvFindResult *results;
 958         int i;
 959         int on_this_page;
 960         int next_page_with_result;
 961         int earliest_page_with_result;
 962         int current_page;
 963         gboolean counts_changed;
 964
 965         results = (EvFindResult*) view->find_results->data;
 966         current_page = ev_document_get_page (view->document);
 967         next_page_with_result = 0;
 968         on_this_page = 0;
 969         earliest_page_with_result = 0;
 970
 971         i = 0;
 972         while (i < view->find_results->len) {
 973                 if (results[i].page_num == current_page) {
 974                         ++on_this_page;
 975                 } else {
 976                         int delta = results[i].page_num - current_page;
 977
 978                         if (delta > 0 && /* result on later page */
 979                             (next_page_with_result == 0 ||
 980                              results[i].page_num < next_page_with_result))
 981                                 next_page_with_result = results[i].page_num;
 982
 983                         if (delta < 0 && /* result on a previous page */
 984                             (earliest_page_with_result == 0 ||
 985                              results[i].page_num < earliest_page_with_result))
 986                                 earliest_page_with_result = results[i].page_num;
 987                 }
 988                 ++i;
 989         }
 990
 991         /* If earliest page is just the current page, there is no earliest page */
 992         if (earliest_page_with_result == current_page)
 993                 earliest_page_with_result = 0;
 994
 995         /* If no next page, then wrap and the wrapped page is the next page */
 996         if (next_page_with_result == 0)
 997                 next_page_with_result = earliest_page_with_result;
 998
 999         counts_changed = FALSE;
1000         if (on_this_page != view->results_on_this_page ||
1001             next_page_with_result != view->next_page_with_result) {
1002                 view->results_on_this_page = on_this_page;
1003                 view->next_page_with_result = next_page_with_result;
1004                 counts_changed = TRUE;
1005         }
1006
1007         if (counts_changed ||
1008             view->find_results->len == 0) {
1009                 char *message;
1010
1011                 message = ev_view_get_find_status_message (view);
1012                 ev_view_set_find_status (view, message);
1013                 g_free (message);
1014         }
1015 }
1016
1017 static void
1018 found_results_callback (EvDocument         *document,
1019                         const EvFindResult *results,
1020                         int                 n_results,
1021                         double              percent_complete,
1022                         void               *data)
1023 {
1024   EvView *view = EV_VIEW (data);
1025
1026   g_array_set_size (view->find_results, 0);
1027
1028   if (n_results > 0)
1029           g_array_append_vals (view->find_results,
1030                                results, n_results);
1031
1032 #if 0
1033   {
1034           int i;
1035
1036           g_printerr ("%d results %d%%: ", n_results,
1037                       (int) (percent_complete * 100));
1038           i = 0;
1039           while (i < n_results) {
1040                   g_printerr ("%d ", results[i].page_num);
1041                   ++i;
1042           }
1043           g_printerr ("\n");
1044   }
1045 #endif
1046
1047   view->find_percent_complete = percent_complete;
1048   update_find_results (view);
1049
1050   gtk_widget_queue_draw (GTK_WIDGET (view));
1051 }
1052
1053 static void
1054 document_changed_callback (EvDocument *document,
1055                            EvView     *view)
1056 {
1057         gtk_widget_queue_draw (GTK_WIDGET (view));
1058         ev_view_set_cursor (view, EV_VIEW_CURSOR_NORMAL);
1059 }
1060
1061 /*** Public API ***/
1062
1063 GtkWidget*
1064 ev_view_new (void)
1065 {
1066         return g_object_new (EV_TYPE_VIEW, NULL);
1067 }
1068
1069 void
1070 ev_view_set_document (EvView     *view,
1071                       EvDocument *document)
1072 {
1073         g_return_if_fail (EV_IS_VIEW (view));
1074
1075         if (document != view->document) {
1076                 if (view->document) {
1077                         g_signal_handlers_disconnect_by_func (view->document,
1078                                                               found_results_callback,
1079                                                               view);
1080                         g_array_set_size (view->find_results, 0);
1081                         view->results_on_this_page = 0;
1082                         view->next_page_with_result = 0;
1083
1084                         g_object_unref (view->document);
1085                 }
1086
1087                 view->document = document;
1088
1089                 if (view->document) {
1090                         g_object_ref (view->document);
1091                         if (EV_IS_DOCUMENT_FIND (view->document))
1092                                 g_signal_connect (view->document,
1093                                                   "found",
1094                                                   G_CALLBACK (found_results_callback),
1095                                                   view);
1096                         g_signal_connect (view->document,
1097                                           "changed",
1098                                           G_CALLBACK (document_changed_callback),
1099                                           view);
1100                 }
1101
1102                 if (GTK_WIDGET_REALIZED (view))
1103                         ev_document_set_target (view->document, view->bin_window);
1104
1105                 gtk_widget_queue_resize (GTK_WIDGET (view));
1106
1107                 g_signal_emit (view, page_changed_signal, 0);
1108         }
1109 }
1110
1111 static void
1112 set_document_page (EvView *view, int page)
1113 {
1114         if (view->document) {
1115                 int old_page = ev_document_get_page (view->document);
1116
1117                 if (old_page != page) {
1118                         ev_view_set_cursor (view, EV_VIEW_CURSOR_WAIT);
1119                         ev_document_set_page (view->document, page);
1120                 }
1121
1122                 if (old_page != ev_document_get_page (view->document)) {
1123                         g_signal_emit (view, page_changed_signal, 0);
1124
1125                         view->find_percent_complete = 0.0;
1126                         update_find_results (view);
1127                 }
1128         }
1129 }
1130
1131 static void
1132 go_to_link (EvView *view, EvLink *link)
1133 {
1134         EvLinkType type;
1135         const char *uri;
1136         int page;
1137
1138         type = ev_link_get_link_type (link);
1139
1140         switch (type) {
1141                 case EV_LINK_TYPE_TITLE:
1142                         break;
1143                 case EV_LINK_TYPE_PAGE:
1144                         page = ev_link_get_page (link);
1145                         set_document_page (view, page);
1146                         break;
1147                 case EV_LINK_TYPE_EXTERNAL_URI:
1148                         uri = ev_link_get_uri (link);
1149                         gnome_vfs_url_show (uri);
1150                         break;
1151         }
1152 }
1153
1154 void
1155 ev_view_go_to_link (EvView *view, EvLink *link)
1156 {
1157         EvLinkType type;
1158
1159         go_to_link (view, link);
1160
1161         type = ev_link_get_link_type (link);
1162         if (type == EV_LINK_TYPE_PAGE) {
1163                 ev_history_add_link (view->history, link);
1164         }
1165 }
1166
1167 static void
1168 go_to_index (EvView *view, int index)
1169 {
1170         EvLink *link;
1171
1172         link = ev_history_get_link_nth (view->history, index);
1173         g_return_if_fail (link != NULL);
1174
1175         go_to_link (view, link);
1176 }
1177
1178 gboolean
1179 ev_view_can_go_back (EvView *view)
1180 {
1181         int index, n;
1182
1183         if (view->history == NULL) {
1184                 return FALSE;
1185         }
1186
1187         index = ev_history_get_current_index (view->history);
1188         n = ev_history_get_n_links (view->history);
1189
1190         if (n > 0) {
1191                 return index != MAX (0, index - 1);
1192         } else {
1193                 return FALSE;
1194         }
1195 }
1196
1197 void
1198 ev_view_go_back (EvView *view)
1199 {
1200         int index, n;
1201
1202         g_return_if_fail (EV_IS_HISTORY (view->history));
1203
1204         index = ev_history_get_current_index (view->history);
1205         n = ev_history_get_n_links (view->history);
1206
1207         if (n > 0) {
1208                 index = MAX (0, index - 1);
1209                 ev_history_set_current_index (view->history, index);
1210         }
1211 }
1212
1213 gboolean
1214 ev_view_can_go_forward (EvView *view)
1215 {
1216         int index, n;
1217
1218         if (view->history == NULL) {
1219                 return FALSE;
1220         }
1221
1222         index = ev_history_get_current_index (view->history);
1223         n = ev_history_get_n_links (view->history);
1224
1225         if (n > 0) {
1226                 return  index != MIN (n - 1, index + 1);
1227         } else {
1228                 return FALSE;
1229         }
1230 }
1231
1232 void
1233 ev_view_go_forward (EvView *view)
1234 {
1235         int index, n;
1236
1237         g_return_if_fail (EV_IS_HISTORY (view->history));
1238
1239         index = ev_history_get_current_index (view->history);
1240         n = ev_history_get_n_links (view->history);
1241
1242         if (n > 0) {
1243                 index = MIN (n - 1, index + 1);
1244                 ev_history_set_current_index (view->history, index);
1245         }
1246 }
1247
1248
1249 void
1250 ev_view_set_page (EvView *view,
1251                   int     page)
1252 {
1253         g_return_if_fail (EV_IS_VIEW (view));
1254         g_return_if_fail (EV_IS_HISTORY (view->history));
1255
1256         set_document_page (view, page);
1257         ev_history_add_page (view->history, page);
1258 }
1259
1260 int
1261 ev_view_get_page (EvView *view)
1262 {
1263         if (view->document)
1264                 return ev_document_get_page (view->document);
1265         else
1266                 return 1;
1267 }
1268
1269 #define ZOOM_IN_FACTOR  1.2
1270 #define ZOOM_OUT_FACTOR (1.0/ZOOM_IN_FACTOR)
1271
1272 #define MIN_SCALE 0.05409
1273 #define MAX_SCALE 18.4884
1274
1275 static void
1276 ev_view_zoom (EvView   *view,
1277               double    factor,
1278               gboolean  relative)
1279 {
1280         double scale;
1281
1282         if (relative)
1283                 scale = view->scale * factor;
1284         else
1285                 scale = factor;
1286
1287         view->scale = CLAMP (scale, MIN_SCALE, MAX_SCALE);
1288
1289         ev_document_set_scale (view->document, view->scale);
1290
1291         gtk_widget_queue_resize (GTK_WIDGET (view));
1292 }
1293
1294 void
1295 ev_view_zoom_in (EvView *view)
1296 {
1297         ev_view_zoom (view, ZOOM_IN_FACTOR, TRUE);
1298 }
1299
1300 void
1301 ev_view_zoom_out (EvView *view)
1302 {
1303         ev_view_zoom (view, ZOOM_OUT_FACTOR, TRUE);
1304 }
1305
1306 void
1307 ev_view_normal_size (EvView *view)
1308 {
1309         ev_view_zoom (view, 1.0, FALSE);
1310 }
1311
1312 void
1313 ev_view_best_fit (EvView *view)
1314 {
1315         double scale;
1316         int width, height;
1317
1318         width = height = 0;
1319         ev_document_get_page_size (view->document, &width, &height);
1320
1321         scale = 1.0;
1322         if (width != 0 && height != 0) {
1323                 double scale_w, scale_h;
1324
1325                 scale_w = (double)GTK_WIDGET (view)->allocation.width * view->scale / width;
1326                 scale_h = (double)GTK_WIDGET (view)->allocation.height * view->scale / height;
1327
1328                 scale = (scale_w < scale_h) ? scale_w : scale_h;
1329         }
1330
1331         ev_view_zoom (view, scale, FALSE);
1332 }
1333
1334 void
1335 ev_view_fit_width (EvView *view)
1336 {
1337         double scale = 1.0;
1338         int width;
1339
1340         width = 0;
1341         ev_document_get_page_size (view->document, &width, NULL);
1342
1343         scale = 1.0;
1344         if (width != 0)
1345                 scale = (double)GTK_WIDGET (view)->allocation.width * view->scale / width;
1346
1347         ev_view_zoom (view, scale, FALSE);
1348 }
1349
1350 static void
1351 history_index_changed_cb (EvHistory  *history,
1352                           GParamSpec *pspec,
1353                           EvView     *view)
1354 {
1355         int index;
1356
1357         index = ev_history_get_current_index (history);
1358         go_to_index (view, index);
1359 }
1360
1361 void
1362 ev_view_set_history (EvView     *view,
1363                      EvHistory  *history)
1364 {
1365         if (view->history) {
1366                 g_object_unref (view->history);
1367         }
1368
1369         view->history = g_object_ref (history);
1370         ev_history_add_page (view->history, ev_view_get_page (view));
1371
1372         g_signal_connect (view->history, "notify::index",
1373                           G_CALLBACK (history_index_changed_cb),
1374                           view);
1375 }
1376
1377 const char *
1378 ev_view_get_status (EvView *view)
1379 {
1380         g_return_val_if_fail (EV_IS_VIEW (view), NULL);
1381
1382         return view->status;
1383 }
1384
1385 const char *
1386 ev_view_get_find_status (EvView *view)
1387 {
1388         g_return_val_if_fail (EV_IS_VIEW (view), NULL);
1389
1390         return view->find_status;
1391 }
1392
1393