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, current_page;
 399         int x_offset, y_offset;
 400         const EvFindResult *results;
 401
 402         if (view->document == NULL)
 403                 return;
 404
 405         x_offset = MAX (0, (widget->allocation.width -
 406                             widget->requisition.width) / 2);
 407         y_offset = MAX (0, (widget->allocation.height -
 408                             widget->requisition.height) / 2);
 409         ev_document_set_page_offset (view->document, x_offset, y_offset);
 410
 411         ev_document_render (view->document,
 412                             event->area.x, event->area.y,
 413                             event->area.width, event->area.height);
 414
 415         results = (EvFindResult*) view->find_results->data;
 416         current_page = ev_document_get_page (view->document);
 417         i = 0;
 418         while (i < view->find_results->len) {
 419 #if 0
 420                 g_printerr ("highlighting result %d page %d at %d,%d %dx%d\n",
 421                             i, results[i].page_num,
 422                             results[i].highlight_area.x,
 423                             results[i].highlight_area.y,
 424                             results[i].highlight_area.width,
 425                             results[i].highlight_area.height);
 426 #endif
 427                 if (results[i].page_num == current_page)
 428                         draw_rubberband (widget, view->bin_window,
 429                                          &results[i].highlight_area);
 430                 ++i;
 431         }
 432
 433         if (view->has_selection) {
 434                 draw_rubberband (widget, view->bin_window, &view->selection);
 435         }
 436 }
 437
 438 static gboolean
 439 ev_view_expose_event (GtkWidget      *widget,
 440                       GdkEventExpose *event)
 441 {
 442         EvView *view = EV_VIEW (widget);
 443
 444         if (event->window == view->bin_window)
 445                 expose_bin_window (widget, event);
 446         else
 447                 return GTK_WIDGET_CLASS (ev_view_parent_class)->expose_event (widget, event);
 448
 449         return FALSE;
 450 }
 451
 452 void
 453 ev_view_select_all (EvView *ev_view)
 454 {
 455         GtkWidget *widget = GTK_WIDGET (ev_view);
 456
 457         g_return_if_fail (EV_IS_VIEW (ev_view));
 458
 459         ev_view->has_selection = TRUE;
 460         ev_view->selection.x = ev_view->selection.y = 0;
 461         ev_view->selection.width = widget->requisition.width;
 462         ev_view->selection.height = widget->requisition.height;
 463
 464         gtk_widget_queue_draw (widget);
 465 }
 466
 467 void
 468 ev_view_copy (EvView *ev_view)
 469 {
 470         GtkClipboard *clipboard;
 471         char *text;
 472
 473         text = ev_document_get_text (ev_view->document, &ev_view->selection);
 474         clipboard = gtk_widget_get_clipboard (GTK_WIDGET (ev_view),
 475                                               GDK_SELECTION_CLIPBOARD);
 476         gtk_clipboard_set_text (clipboard, text, -1);
 477         g_free (text);
 478 }
 479
 480 static void
 481 ev_view_primary_get_cb (GtkClipboard     *clipboard,
 482                         GtkSelectionData *selection_data,
 483                         guint             info,
 484                         gpointer          data)
 485 {
 486         EvView *ev_view = EV_VIEW (data);
 487         char *text;
 488
 489         text = ev_document_get_text (ev_view->document, &ev_view->selection);
 490         gtk_selection_data_set_text (selection_data, text, -1);
 491 }
 492
 493 static void
 494 ev_view_primary_clear_cb (GtkClipboard *clipboard,
 495                           gpointer      data)
 496 {
 497         EvView *ev_view = EV_VIEW (data);
 498
 499         ev_view->has_selection = FALSE;
 500 }
 501
 502 static void
 503 ev_view_update_primary_selection (EvView *ev_view)
 504 {
 505         GtkClipboard *clipboard;
 506
 507         clipboard = gtk_widget_get_clipboard (GTK_WIDGET (ev_view),
 508                                               GDK_SELECTION_PRIMARY);
 509
 510         if (ev_view->has_selection) {
 511                 if (!gtk_clipboard_set_with_owner (clipboard,
 512                                                    targets,
 513                                                    G_N_ELEMENTS (targets),
 514                                                    ev_view_primary_get_cb,
 515                                                    ev_view_primary_clear_cb,
 516                                                    G_OBJECT (ev_view)))
 517                         ev_view_primary_clear_cb (clipboard, ev_view);
 518         } else {
 519                 if (gtk_clipboard_get_owner (clipboard) == G_OBJECT (ev_view))
 520                         gtk_clipboard_clear (clipboard);
 521         }
 522 }
 523
 524 static gboolean
 525 ev_view_button_press_event (GtkWidget      *widget,
 526                             GdkEventButton *event)
 527 {
 528         EvView *view = EV_VIEW (widget);
 529
 530         if (!GTK_WIDGET_HAS_FOCUS (widget)) {
 531                 gtk_widget_grab_focus (widget);
 532         }
 533
 534         view->pressed_button = event->button;
 535
 536         switch (event->button) {
 537                 case 1:
 538                         if (view->has_selection) {
 539                                 view->has_selection = FALSE;
 540                                 gtk_widget_queue_draw (widget);
 541                         }
 542
 543                         view->selection.x = event->x;
 544                         view->selection.y = event->y;
 545                         view->selection.width = 0;
 546                         view->selection.height = 0;
 547                         break;
 548         }
 549
 550         return TRUE;
 551 }
 552
 553 static char *
 554 status_message_from_link (EvLink *link)
 555 {
 556         EvLinkType type;
 557         char *msg;
 558         int page;
 559
 560         type = ev_link_get_link_type (link);
 561
 562         switch (type) {
 563                 case EV_LINK_TYPE_TITLE:
 564                         msg = g_strdup (ev_link_get_title (link));
 565                         break;
 566                 case EV_LINK_TYPE_PAGE:
 567                         page = ev_link_get_page (link);
 568                         msg = g_strdup_printf (_("Go to page %d"), page);
 569                         break;
 570                 case EV_LINK_TYPE_EXTERNAL_URI:
 571                         msg = g_strdup (ev_link_get_uri (link));
 572                         break;
 573                 default:
 574                         msg = NULL;
 575         }
 576
 577         return msg;
 578 }
 579
 580 static void
 581 ev_view_set_status (EvView *view, const char *message)
 582 {
 583         g_return_if_fail (EV_IS_VIEW (view));
 584
 585         if (message != view->status) {
 586                 g_free (view->status);
 587                 view->status = g_strdup (message);
 588                 g_object_notify (G_OBJECT (view), "status");
 589         }
 590 }
 591
 592 static void
 593 ev_view_set_find_status (EvView *view, const char *message)
 594 {
 595         g_return_if_fail (EV_IS_VIEW (view));
 596
 597         g_free (view->find_status);
 598         view->find_status = g_strdup (message);
 599         g_object_notify (G_OBJECT (view), "find-status");
 600 }
 601
 602 static void
 603 ev_view_set_cursor (EvView *view, EvViewCursor new_cursor)
 604 {
 605         GdkCursor *cursor = NULL;
 606         GdkDisplay *display;
 607         GtkWidget *widget;
 608
 609         if (view->cursor == new_cursor) {
 610                 return;
 611         }
 612
 613         widget = gtk_widget_get_toplevel (GTK_WIDGET (view));
 614         display = gtk_widget_get_display (widget);
 615         view->cursor = new_cursor;
 616
 617         switch (new_cursor) {
 618                 case EV_VIEW_CURSOR_NORMAL:
 619                         gdk_window_set_cursor (widget->window, NULL);
 620                         break;
 621                 case EV_VIEW_CURSOR_LINK:
 622                         cursor = gdk_cursor_new_for_display (display, GDK_HAND2);
 623                         break;
 624                 case EV_VIEW_CURSOR_WAIT:
 625                         cursor = gdk_cursor_new_for_display (display, GDK_WATCH);
 626                         break;
 627         }
 628
 629         if (cursor) {
 630                 gdk_window_set_cursor (widget->window, cursor);
 631                 gdk_cursor_unref (cursor);
 632                 gdk_flush();
 633         }
 634 }
 635
 636 static gboolean
 637 ev_view_motion_notify_event (GtkWidget      *widget,
 638                              GdkEventMotion *event)
 639 {
 640         EvView *view = EV_VIEW (widget);
 641
 642         if (view->pressed_button > 0) {
 643                 view->has_selection = TRUE;
 644                 view->selection.x = MIN (view->selection.x, event->x);
 645                 view->selection.y = MIN (view->selection.y, event->y);
 646                 view->selection.width = ABS (view->selection.x - event->x) + 1;
 647                 view->selection.height = ABS (view->selection.y - event->y) + 1;
 648         } else if (view->document) {
 649                 EvLink *link;
 650
 651                 link = ev_document_get_link (view->document, event->x, event->y);
 652                 if (link) {
 653                         char *msg;
 654
 655                         msg = status_message_from_link (link);
 656                         ev_view_set_status (view, msg);
 657                         ev_view_set_cursor (view, EV_VIEW_CURSOR_LINK);
 658                         g_free (msg);
 659
 660                         g_object_unref (link);
 661                 } else {
 662                         ev_view_set_status (view, NULL);
 663                         if (view->cursor == EV_VIEW_CURSOR_LINK) {
 664                                 ev_view_set_cursor (view, EV_VIEW_CURSOR_NORMAL);
 665                         }
 666                 }
 667         }
 668
 669         gtk_widget_queue_draw (widget);
 670
 671         return TRUE;
 672 }
 673
 674 static gboolean
 675 ev_view_button_release_event (GtkWidget      *widget,
 676                               GdkEventButton *event)
 677 {
 678         EvView *view = EV_VIEW (widget);
 679
 680         view->pressed_button = -1;
 681
 682         if (view->has_selection) {
 683                 ev_view_update_primary_selection (view);
 684         } else if (view->document) {
 685                 EvLink *link;
 686
 687                 link = ev_document_get_link (view->document,
 688                                              event->x,
 689                                              event->y);
 690                 if (link) {
 691                         ev_view_go_to_link (view, link);
 692                         g_object_unref (link);
 693                 }
 694         }
 695
 696         return FALSE;
 697 }
 698
 699 static void
 700 on_adjustment_value_changed (GtkAdjustment  *adjustment,
 701                              EvView *view)
 702 {
 703         view_update_adjustments (view);
 704 }
 705
 706 static void
 707 set_scroll_adjustment (EvView *view,
 708                        GtkOrientation  orientation,
 709                        GtkAdjustment  *adjustment)
 710 {
 711         GtkAdjustment **to_set;
 712
 713         if (orientation == GTK_ORIENTATION_HORIZONTAL)
 714                 to_set = &view->hadjustment;
 715         else
 716                 to_set = &view->vadjustment;
 717
 718         if (*to_set != adjustment) {
 719                 if (*to_set) {
 720                         g_signal_handlers_disconnect_by_func (*to_set,
 721                                                               (gpointer) on_adjustment_value_changed,
 722                                                               view);
 723                         g_object_unref (*to_set);
 724                 }
 725
 726                 *to_set = adjustment;
 727                 view_set_adjustment_values (view, orientation);
 728
 729                 if (*to_set) {
 730                         g_object_ref (*to_set);
 731                         g_signal_connect (*to_set, "value_changed",
 732                                           G_CALLBACK (on_adjustment_value_changed), view);
 733                 }
 734         }
 735 }
 736
 737 static void
 738 ev_view_set_scroll_adjustments (EvView *view,
 739                                 GtkAdjustment  *hadjustment,
 740                                 GtkAdjustment  *vadjustment)
 741 {
 742         set_scroll_adjustment (view, GTK_ORIENTATION_HORIZONTAL, hadjustment);
 743         set_scroll_adjustment (view, GTK_ORIENTATION_VERTICAL, vadjustment);
 744
 745         view_update_adjustments (view);
 746 }
 747
 748 static void
 749 add_scroll_binding (GtkBindingSet  *binding_set,
 750                     guint           keyval,
 751                     GtkScrollType   scroll,
 752                     gboolean        horizontal)
 753 {
 754   guint keypad_keyval = keyval - GDK_Left + GDK_KP_Left;
 755
 756   gtk_binding_entry_add_signal (binding_set, keyval, 0,
 757                                 "scroll_view", 2,
 758                                 GTK_TYPE_SCROLL_TYPE, scroll,
 759                                 G_TYPE_BOOLEAN, horizontal);
 760   gtk_binding_entry_add_signal (binding_set, keypad_keyval, 0,
 761                                 "scroll_view", 2,
 762                                 GTK_TYPE_SCROLL_TYPE, scroll,
 763                                 G_TYPE_BOOLEAN, horizontal);
 764 }
 765
 766 static void
 767 ev_view_scroll_view (EvView *view,
 768                      GtkScrollType scroll,
 769                      gboolean horizontal)
 770 {
 771         if (scroll == GTK_SCROLL_PAGE_BACKWARD) {
 772                 ev_view_set_page (view, ev_view_get_page (view) - 1);
 773         } else if (scroll == GTK_SCROLL_PAGE_FORWARD) {
 774                 ev_view_set_page (view, ev_view_get_page (view) + 1);
 775         } else {
 776                 GtkAdjustment *adjustment;
 777                 double value;
 778
 779                 if (horizontal) {
 780                         adjustment = view->hadjustment;
 781                 } else {
 782                         adjustment = view->vadjustment;
 783                 }
 784
 785                 value = adjustment->value;
 786
 787                 switch (scroll) {
 788                         case GTK_SCROLL_STEP_BACKWARD:
 789                                 value -= adjustment->step_increment;
 790                                 break;
 791                         case GTK_SCROLL_STEP_FORWARD:
 792                                 value += adjustment->step_increment;
 793                                 break;
 794                         default:
 795                                 break;
 796                 }
 797
 798                 value = CLAMP (value, adjustment->lower,
 799                                adjustment->upper - adjustment->page_size);
 800
 801                 gtk_adjustment_set_value (adjustment, value);
 802         }
 803 }
 804
 805 static void
 806 ev_view_set_property (GObject *object,
 807                       guint prop_id,
 808                       const GValue *value,
 809                       GParamSpec *pspec)
 810 {
 811         switch (prop_id)
 812         {
 813                 /* Read only */
 814                 case PROP_STATUS:
 815                 case PROP_FIND_STATUS:
 816                         break;
 817         }
 818 }
 819
 820 static void
 821 ev_view_get_property (GObject *object,
 822                       guint prop_id,
 823                       GValue *value,
 824                       GParamSpec *pspec)
 825 {
 826         EvView *view = EV_VIEW (object);
 827
 828         switch (prop_id)
 829         {
 830                 case PROP_STATUS:
 831                         g_value_set_string (value, view->status);
 832                         break;
 833                 case PROP_FIND_STATUS:
 834                         g_value_set_string (value, view->status);
 835                         break;
 836         }
 837 }
 838
 839 static void
 840 ev_view_class_init (EvViewClass *class)
 841 {
 842         GObjectClass *object_class = G_OBJECT_CLASS (class);
 843         GtkObjectClass *gtk_object_class = GTK_OBJECT_CLASS (class);
 844         GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
 845         GtkBindingSet *binding_set;
 846
 847         object_class->finalize = ev_view_finalize;
 848         object_class->set_property = ev_view_set_property;
 849         object_class->get_property = ev_view_get_property;
 850
 851         widget_class->expose_event = ev_view_expose_event;
 852         widget_class->button_press_event = ev_view_button_press_event;
 853         widget_class->motion_notify_event = ev_view_motion_notify_event;
 854         widget_class->button_release_event = ev_view_button_release_event;
 855         widget_class->size_request = ev_view_size_request;
 856         widget_class->size_allocate = ev_view_size_allocate;
 857         widget_class->realize = ev_view_realize;
 858         widget_class->unrealize = ev_view_unrealize;
 859         widget_class->style_set = ev_view_style_set;
 860         widget_class->state_changed = ev_view_state_changed;
 861         gtk_object_class->destroy = ev_view_destroy;
 862
 863         class->set_scroll_adjustments = ev_view_set_scroll_adjustments;
 864         class->scroll_view = ev_view_scroll_view;
 865
 866         widget_class->set_scroll_adjustments_signal =  g_signal_new ("set-scroll-adjustments",
 867                                                                      G_OBJECT_CLASS_TYPE (object_class),
 868                                                                      G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 869                                                                      G_STRUCT_OFFSET (EvViewClass, set_scroll_adjustments),
 870                                                                      NULL, NULL,
 871                                                                      ev_marshal_VOID__OBJECT_OBJECT,
 872                                                                      G_TYPE_NONE, 2,
 873                                                                      GTK_TYPE_ADJUSTMENT,
 874                                                                      GTK_TYPE_ADJUSTMENT);
 875         page_changed_signal = g_signal_new ("page-changed",
 876                                             G_OBJECT_CLASS_TYPE (object_class),
 877                                             G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 878                                             G_STRUCT_OFFSET (EvViewClass, page_changed),
 879                                             NULL, NULL,
 880                                             ev_marshal_VOID__NONE,
 881                                             G_TYPE_NONE, 0);
 882
 883         g_signal_new ("scroll_view",
 884                       G_TYPE_FROM_CLASS (object_class),
 885                       G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 886                       G_STRUCT_OFFSET (EvViewClass, scroll_view),
 887                       NULL, NULL,
 888                       ev_marshal_VOID__ENUM_BOOLEAN,
 889                       G_TYPE_NONE, 2,
 890                       GTK_TYPE_SCROLL_TYPE,
 891                       G_TYPE_BOOLEAN);
 892
 893         g_object_class_install_property (object_class,
 894                                          PROP_STATUS,
 895                                          g_param_spec_string ("status",
 896                                                               "Status Message",
 897                                                               "The status message",
 898                                                               NULL,
 899                                                               G_PARAM_READABLE));
 900
 901         g_object_class_install_property (object_class,
 902                                          PROP_STATUS,
 903                                          g_param_spec_string ("find-status",
 904                                                               "Find Status Message",
 905                                                               "The find status message",
 906                                                               NULL,
 907                                                               G_PARAM_READABLE));
 908
 909         binding_set = gtk_binding_set_by_class (class);
 910
 911         add_scroll_binding (binding_set, GDK_Left,  GTK_SCROLL_STEP_BACKWARD, TRUE);
 912         add_scroll_binding (binding_set, GDK_Right, GTK_SCROLL_STEP_FORWARD,  TRUE);
 913         add_scroll_binding (binding_set, GDK_Up,    GTK_SCROLL_STEP_BACKWARD, FALSE);
 914         add_scroll_binding (binding_set, GDK_Down,  GTK_SCROLL_STEP_FORWARD,  FALSE);
 915
 916         add_scroll_binding (binding_set, GDK_Page_Up,   GTK_SCROLL_PAGE_BACKWARD, FALSE);
 917         add_scroll_binding (binding_set, GDK_Page_Down, GTK_SCROLL_PAGE_FORWARD,  FALSE);
 918 }
 919
 920 static void
 921 ev_view_init (EvView *view)
 922 {
 923         static const GdkColor white = { 0, 0xffff, 0xffff, 0xffff };
 924
 925         GTK_WIDGET_SET_FLAGS (view, GTK_CAN_FOCUS);
 926
 927         view->scale = 1.0;
 928         view->pressed_button = -1;
 929         view->cursor = EV_VIEW_CURSOR_NORMAL;
 930
 931         gtk_widget_modify_bg (GTK_WIDGET (view), GTK_STATE_NORMAL, &white);
 932
 933         view->find_results = g_array_new (FALSE,
 934                                           FALSE,
 935                                           sizeof (EvFindResult));
 936         view->results_on_this_page = 0;
 937         view->next_page_with_result = 0;
 938 }
 939
 940 static char *
 941 ev_view_get_find_status_message (EvView *view)
 942 {
 943         if (view->find_results->len == 0) {
 944                 if (view->find_percent_complete >= (1.0 - 1e-10)) {
 945                         return g_strdup (_("Not found"));
 946                 } else {
 947                         return g_strdup_printf (_("%3d%% remaining to search"),
 948                                                 (int) ((1.0 - view->find_percent_complete) * 100));
 949                 }
 950         } else if (view->results_on_this_page == 0) {
 951                 g_assert (view->next_page_with_result != 0);
 952                 return g_strdup_printf (_("Found on page %d"),
 953                                         view->next_page_with_result);
 954         } else {
 955                 return g_strdup_printf (_("%d found on this page"),
 956                                         view->results_on_this_page);
 957         }
 958 }
 959
 960 static void
 961 update_find_results (EvView *view)
 962 {
 963         const EvFindResult *results;
 964         int i;
 965         int on_this_page;
 966         int next_page_with_result;
 967         int earliest_page_with_result;
 968         int current_page;
 969         gboolean counts_changed;
 970
 971         results = (EvFindResult*) view->find_results->data;
 972         current_page = ev_document_get_page (view->document);
 973         next_page_with_result = 0;
 974         on_this_page = 0;
 975         earliest_page_with_result = 0;
 976
 977         i = 0;
 978         while (i < view->find_results->len) {
 979                 if (results[i].page_num == current_page) {
 980                         ++on_this_page;
 981                 } else {
 982                         int delta = results[i].page_num - current_page;
 983
 984                         if (delta > 0 && /* result on later page */
 985                             (next_page_with_result == 0 ||
 986                              results[i].page_num < next_page_with_result))
 987                                 next_page_with_result = results[i].page_num;
 988
 989                         if (delta < 0 && /* result on a previous page */
 990                             (earliest_page_with_result == 0 ||
 991                              results[i].page_num < earliest_page_with_result))
 992                                 earliest_page_with_result = results[i].page_num;
 993                 }
 994                 ++i;
 995         }
 996
 997         /* If earliest page is just the current page, there is no earliest page */
 998         if (earliest_page_with_result == current_page)
 999                 earliest_page_with_result = 0;
1000
1001         /* If no next page, then wrap and the wrapped page is the next page */
1002         if (next_page_with_result == 0)
1003                 next_page_with_result = earliest_page_with_result;
1004
1005         counts_changed = FALSE;
1006         if (on_this_page != view->results_on_this_page ||
1007             next_page_with_result != view->next_page_with_result) {
1008                 view->results_on_this_page = on_this_page;
1009                 view->next_page_with_result = next_page_with_result;
1010                 counts_changed = TRUE;
1011         }
1012
1013         if (counts_changed ||
1014             view->find_results->len == 0) {
1015                 char *message;
1016
1017                 message = ev_view_get_find_status_message (view);
1018                 ev_view_set_find_status (view, message);
1019                 g_free (message);
1020         }
1021 }
1022
1023 static void
1024 found_results_callback (EvDocument         *document,
1025                         const EvFindResult *results,
1026                         int                 n_results,
1027                         double              percent_complete,
1028                         void               *data)
1029 {
1030   EvView *view = EV_VIEW (data);
1031
1032   g_array_set_size (view->find_results, 0);
1033
1034   if (n_results > 0)
1035           g_array_append_vals (view->find_results,
1036                                results, n_results);
1037
1038 #if 0
1039   {
1040           int i;
1041
1042           g_printerr ("%d results %d%%: ", n_results,
1043                       (int) (percent_complete * 100));
1044           i = 0;
1045           while (i < n_results) {
1046                   g_printerr ("%d ", results[i].page_num);
1047                   ++i;
1048           }
1049           g_printerr ("\n");
1050   }
1051 #endif
1052
1053   view->find_percent_complete = percent_complete;
1054   update_find_results (view);
1055
1056   gtk_widget_queue_draw (GTK_WIDGET (view));
1057 }
1058
1059 static void
1060 document_changed_callback (EvDocument *document,
1061                            EvView     *view)
1062 {
1063         gtk_widget_queue_draw (GTK_WIDGET (view));
1064         ev_view_set_cursor (view, EV_VIEW_CURSOR_NORMAL);
1065 }
1066
1067 /*** Public API ***/
1068
1069 GtkWidget*
1070 ev_view_new (void)
1071 {
1072         return g_object_new (EV_TYPE_VIEW, NULL);
1073 }
1074
1075 void
1076 ev_view_set_document (EvView     *view,
1077                       EvDocument *document)
1078 {
1079         g_return_if_fail (EV_IS_VIEW (view));
1080
1081         if (document != view->document) {
1082                 if (view->document) {
1083                         g_signal_handlers_disconnect_by_func (view->document,
1084                                                               found_results_callback,
1085                                                               view);
1086                         g_array_set_size (view->find_results, 0);
1087                         view->results_on_this_page = 0;
1088                         view->next_page_with_result = 0;
1089
1090                         g_object_unref (view->document);
1091                 }
1092
1093                 view->document = document;
1094
1095                 if (view->document) {
1096                         g_object_ref (view->document);
1097                         if (EV_IS_DOCUMENT_FIND (view->document))
1098                                 g_signal_connect (view->document,
1099                                                   "found",
1100                                                   G_CALLBACK (found_results_callback),
1101                                                   view);
1102                         g_signal_connect (view->document,
1103                                           "changed",
1104                                           G_CALLBACK (document_changed_callback),
1105                                           view);
1106                 }
1107
1108                 if (GTK_WIDGET_REALIZED (view))
1109                         ev_document_set_target (view->document, view->bin_window);
1110
1111                 gtk_widget_queue_resize (GTK_WIDGET (view));
1112
1113                 g_signal_emit (view, page_changed_signal, 0);
1114         }
1115 }
1116
1117 static void
1118 set_document_page (EvView *view, int page)
1119 {
1120         if (view->document) {
1121                 int old_page = ev_document_get_page (view->document);
1122
1123                 if (old_page != page) {
1124                         ev_view_set_cursor (view, EV_VIEW_CURSOR_WAIT);
1125                         ev_document_set_page (view->document, page);
1126                 }
1127
1128                 if (old_page != ev_document_get_page (view->document)) {
1129                         g_signal_emit (view, page_changed_signal, 0);
1130
1131                         view->find_percent_complete = 0.0;
1132                         update_find_results (view);
1133                 }
1134         }
1135 }
1136
1137 static void
1138 go_to_link (EvView *view, EvLink *link)
1139 {
1140         EvLinkType type;
1141         const char *uri;
1142         int page;
1143
1144         type = ev_link_get_link_type (link);
1145
1146         switch (type) {
1147                 case EV_LINK_TYPE_TITLE:
1148                         break;
1149                 case EV_LINK_TYPE_PAGE:
1150                         page = ev_link_get_page (link);
1151                         set_document_page (view, page);
1152                         break;
1153                 case EV_LINK_TYPE_EXTERNAL_URI:
1154                         uri = ev_link_get_uri (link);
1155                         gnome_vfs_url_show (uri);
1156                         break;
1157         }
1158 }
1159
1160 void
1161 ev_view_go_to_link (EvView *view, EvLink *link)
1162 {
1163         EvLinkType type;
1164
1165         go_to_link (view, link);
1166
1167         type = ev_link_get_link_type (link);
1168         if (type == EV_LINK_TYPE_PAGE) {
1169                 ev_history_add_link (view->history, link);
1170         }
1171 }
1172
1173 static void
1174 go_to_index (EvView *view, int index)
1175 {
1176         EvLink *link;
1177
1178         link = ev_history_get_link_nth (view->history, index);
1179         g_return_if_fail (link != NULL);
1180
1181         go_to_link (view, link);
1182 }
1183
1184 gboolean
1185 ev_view_can_go_back (EvView *view)
1186 {
1187         int index, n;
1188
1189         if (view->history == NULL) {
1190                 return FALSE;
1191         }
1192
1193         index = ev_history_get_current_index (view->history);
1194         n = ev_history_get_n_links (view->history);
1195
1196         if (n > 0) {
1197                 return index != MAX (0, index - 1);
1198         } else {
1199                 return FALSE;
1200         }
1201 }
1202
1203 void
1204 ev_view_go_back (EvView *view)
1205 {
1206         int index, n;
1207
1208         g_return_if_fail (EV_IS_HISTORY (view->history));
1209
1210         index = ev_history_get_current_index (view->history);
1211         n = ev_history_get_n_links (view->history);
1212
1213         if (n > 0) {
1214                 index = MAX (0, index - 1);
1215                 ev_history_set_current_index (view->history, index);
1216         }
1217 }
1218
1219 gboolean
1220 ev_view_can_go_forward (EvView *view)
1221 {
1222         int index, n;
1223
1224         if (view->history == NULL) {
1225                 return FALSE;
1226         }
1227
1228         index = ev_history_get_current_index (view->history);
1229         n = ev_history_get_n_links (view->history);
1230
1231         if (n > 0) {
1232                 return  index != MIN (n - 1, index + 1);
1233         } else {
1234                 return FALSE;
1235         }
1236 }
1237
1238 void
1239 ev_view_go_forward (EvView *view)
1240 {
1241         int index, n;
1242
1243         g_return_if_fail (EV_IS_HISTORY (view->history));
1244
1245         index = ev_history_get_current_index (view->history);
1246         n = ev_history_get_n_links (view->history);
1247
1248         if (n > 0) {
1249                 index = MIN (n - 1, index + 1);
1250                 ev_history_set_current_index (view->history, index);
1251         }
1252 }
1253
1254
1255 void
1256 ev_view_set_page (EvView *view,
1257                   int     page)
1258 {
1259         g_return_if_fail (EV_IS_VIEW (view));
1260         g_return_if_fail (EV_IS_HISTORY (view->history));
1261
1262         set_document_page (view, page);
1263         ev_history_add_page (view->history, page);
1264 }
1265
1266 int
1267 ev_view_get_page (EvView *view)
1268 {
1269         if (view->document)
1270                 return ev_document_get_page (view->document);
1271         else
1272                 return 1;
1273 }
1274
1275 #define ZOOM_IN_FACTOR  1.2
1276 #define ZOOM_OUT_FACTOR (1.0/ZOOM_IN_FACTOR)
1277
1278 #define MIN_SCALE 0.05409
1279 #define MAX_SCALE 18.4884
1280
1281 static void
1282 ev_view_zoom (EvView   *view,
1283               double    factor,
1284               gboolean  relative)
1285 {
1286         double scale;
1287
1288         if (relative)
1289                 scale = view->scale * factor;
1290         else
1291                 scale = factor;
1292
1293         view->scale = CLAMP (scale, MIN_SCALE, MAX_SCALE);
1294
1295         ev_document_set_scale (view->document, view->scale);
1296
1297         gtk_widget_queue_resize (GTK_WIDGET (view));
1298 }
1299
1300 void
1301 ev_view_zoom_in (EvView *view)
1302 {
1303         ev_view_zoom (view, ZOOM_IN_FACTOR, TRUE);
1304 }
1305
1306 void
1307 ev_view_zoom_out (EvView *view)
1308 {
1309         ev_view_zoom (view, ZOOM_OUT_FACTOR, TRUE);
1310 }
1311
1312 void
1313 ev_view_normal_size (EvView *view)
1314 {
1315         ev_view_zoom (view, 1.0, FALSE);
1316 }
1317
1318 void
1319 ev_view_best_fit (EvView *view)
1320 {
1321         double scale;
1322         int width, height;
1323
1324         width = height = 0;
1325         ev_document_get_page_size (view->document, &width, &height);
1326
1327         scale = 1.0;
1328         if (width != 0 && height != 0) {
1329                 double scale_w, scale_h;
1330
1331                 scale_w = (double)GTK_WIDGET (view)->allocation.width * view->scale / width;
1332                 scale_h = (double)GTK_WIDGET (view)->allocation.height * view->scale / height;
1333
1334                 scale = (scale_w < scale_h) ? scale_w : scale_h;
1335         }
1336
1337         ev_view_zoom (view, scale, FALSE);
1338 }
1339
1340 void
1341 ev_view_fit_width (EvView *view)
1342 {
1343         double scale = 1.0;
1344         int width;
1345
1346         width = 0;
1347         ev_document_get_page_size (view->document, &width, NULL);
1348
1349         scale = 1.0;
1350         if (width != 0)
1351                 scale = (double)GTK_WIDGET (view)->allocation.width * view->scale / width;
1352
1353         ev_view_zoom (view, scale, FALSE);
1354 }
1355
1356 static void
1357 history_index_changed_cb (EvHistory  *history,
1358                           GParamSpec *pspec,
1359                           EvView     *view)
1360 {
1361         int index;
1362
1363         index = ev_history_get_current_index (history);
1364         go_to_index (view, index);
1365 }
1366
1367 void
1368 ev_view_set_history (EvView     *view,
1369                      EvHistory  *history)
1370 {
1371         if (view->history) {
1372                 g_object_unref (view->history);
1373         }
1374
1375         view->history = g_object_ref (history);
1376         ev_history_add_page (view->history, ev_view_get_page (view));
1377
1378         g_signal_connect (view->history, "notify::index",
1379                           G_CALLBACK (history_index_changed_cb),
1380                           view);
1381 }
1382
1383 const char *
1384 ev_view_get_status (EvView *view)
1385 {
1386         g_return_val_if_fail (EV_IS_VIEW (view), NULL);
1387
1388         return view->status;
1389 }
1390
1391 const char *
1392 ev_view_get_find_status (EvView *view)
1393 {
1394         g_return_val_if_fail (EV_IS_VIEW (view), NULL);
1395
1396         return view->find_status;
1397 }
1398
1399