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                 requisition->width += 2;
 228                 requisition->height += 2;
 229         }
 230
 231 }
 232
 233 static void
 234 ev_view_size_allocate (GtkWidget      *widget,
 235                        GtkAllocation  *allocation)
 236 {
 237         EvView *view = EV_VIEW (widget);
 238
 239         GTK_WIDGET_CLASS (ev_view_parent_class)->size_allocate (widget, allocation);
 240
 241         view_set_adjustment_values (view, GTK_ORIENTATION_HORIZONTAL);
 242         view_set_adjustment_values (view, GTK_ORIENTATION_VERTICAL);
 243
 244         if (GTK_WIDGET_REALIZED (widget)) {
 245                 gdk_window_resize (view->bin_window,
 246                                    MAX (widget->allocation.width, widget->requisition.width),
 247                                    MAX (widget->allocation.height, widget->requisition.height));
 248         }
 249 }
 250
 251 static void
 252 ev_view_realize (GtkWidget *widget)
 253 {
 254         EvView *view = EV_VIEW (widget);
 255         GdkWindowAttr attributes;
 256
 257         GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 258
 259         attributes.window_type = GDK_WINDOW_CHILD;
 260         attributes.wclass = GDK_INPUT_OUTPUT;
 261         attributes.visual = gtk_widget_get_visual (widget);
 262         attributes.colormap = gtk_widget_get_colormap (widget);
 263
 264         attributes.x = widget->allocation.x;
 265         attributes.y = widget->allocation.y;
 266         attributes.width = widget->allocation.width;
 267         attributes.height = widget->allocation.height;
 268         attributes.event_mask = 0;
 269
 270         widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
 271                                          &attributes,
 272                                          GDK_WA_X | GDK_WA_Y |
 273                                          GDK_WA_COLORMAP |
 274                                          GDK_WA_VISUAL);
 275         gdk_window_set_user_data (widget->window, widget);
 276         widget->style = gtk_style_attach (widget->style, widget->window);
 277
 278         attributes.x = 0;
 279         attributes.y = 0;
 280         attributes.width = MAX (widget->allocation.width, widget->requisition.width);
 281         attributes.height = MAX (widget->allocation.height, widget->requisition.height);
 282         attributes.event_mask = GDK_EXPOSURE_MASK |
 283                                 GDK_BUTTON_PRESS_MASK |
 284                                 GDK_BUTTON_RELEASE_MASK |
 285                                 GDK_SCROLL_MASK |
 286                                 GDK_KEY_PRESS_MASK |
 287                                 GDK_POINTER_MOTION_MASK;
 288
 289         view->bin_window = gdk_window_new (widget->window,
 290                                            &attributes,
 291                                            GDK_WA_X | GDK_WA_Y |
 292                                            GDK_WA_COLORMAP |
 293                                            GDK_WA_VISUAL);
 294         gdk_window_set_user_data (view->bin_window, widget);
 295         gdk_window_show (view->bin_window);
 296
 297         widget->style = gtk_style_attach (widget->style, view->bin_window);
 298         gtk_style_set_background (widget->style, view->bin_window, GTK_STATE_NORMAL);
 299
 300         if (view->document) {
 301                 ev_document_set_target (view->document, view->bin_window);
 302
 303                 /* We can't get page size without a target, so we have to
 304                  * queue a size request at realization. Could be fixed
 305                  * with EvDocument changes to allow setting a GdkScreen
 306                  * without setting a target.
 307                  */
 308                 gtk_widget_queue_resize (widget);
 309         }
 310 }
 311
 312 static void
 313 ev_view_unrealize (GtkWidget *widget)
 314 {
 315         EvView *view = EV_VIEW (widget);
 316
 317         if (view->document)
 318                 ev_document_set_target (view->document, NULL);
 319
 320         gdk_window_set_user_data (view->bin_window, NULL);
 321         gdk_window_destroy (view->bin_window);
 322         view->bin_window = NULL;
 323
 324         GTK_WIDGET_CLASS (ev_view_parent_class)->unrealize (widget);
 325 }
 326
 327 static guint32
 328 ev_gdk_color_to_rgb (const GdkColor *color)
 329 {
 330   guint32 result;
 331   result = (0xff0000 | (color->red & 0xff00));
 332   result <<= 8;
 333   result |= ((color->green & 0xff00) | (color->blue >> 8));
 334   return result;
 335 }
 336
 337 static void
 338 draw_rubberband (GtkWidget *widget, GdkWindow *window, const GdkRectangle *rect)
 339 {
 340         GdkGC *gc;
 341         GdkPixbuf *pixbuf;
 342         GdkColor *fill_color_gdk;
 343         guint fill_color;
 344
 345         fill_color_gdk = gdk_color_copy (&GTK_WIDGET (widget)->style->base[GTK_STATE_SELECTED]);
 346         fill_color = ev_gdk_color_to_rgb (fill_color_gdk) << 8 | 0x40;
 347
 348         pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8,
 349                                  rect->width, rect->height);
 350         gdk_pixbuf_fill (pixbuf, fill_color);
 351
 352         gdk_draw_pixbuf (window, NULL, pixbuf,
 353                          0, 0,
 354                          rect->x,rect->y,
 355                          rect->width, rect->height,
 356                          GDK_RGB_DITHER_NONE,
 357                          0, 0);
 358
 359         g_object_unref (pixbuf);
 360
 361         gc = gdk_gc_new (window);
 362         gdk_gc_set_rgb_fg_color (gc, fill_color_gdk);
 363         gdk_draw_rectangle (window, gc, FALSE,
 364                             rect->x, rect->y,
 365                             rect->width - 1,
 366                             rect->height - 1);
 367         g_object_unref (gc);
 368
 369         gdk_color_free (fill_color_gdk);
 370 }
 371
 372 static void
 373 expose_bin_window (GtkWidget      *widget,
 374                    GdkEventExpose *event)
 375 {
 376         EvView *view = EV_VIEW (widget);
 377         int i, current_page;
 378         int x_offset, y_offset;
 379         const EvFindResult *results;
 380
 381         if (view->document == NULL)
 382                 return;
 383
 384         x_offset = MAX (0, (widget->allocation.width -
 385                             widget->requisition.width) / 2);
 386         y_offset = MAX (0, (widget->allocation.height -
 387                             widget->requisition.height) / 2);
 388         gdk_draw_rectangle (view->bin_window,
 389                             widget->style->black_gc,
 390                             FALSE,
 391                             x_offset,
 392                             y_offset,
 393                             widget->requisition.width - 1,
 394                             widget->requisition.height - 1);
 395
 396         ev_document_set_page_offset (view->document,
 397                                      x_offset + 1,
 398                                      y_offset + 1);
 399
 400         ev_document_render (view->document,
 401                             event->area.x, event->area.y,
 402                             event->area.width, event->area.height);
 403
 404         results = (EvFindResult*) view->find_results->data;
 405         current_page = ev_document_get_page (view->document);
 406         i = 0;
 407         while (i < view->find_results->len) {
 408 #if 0
 409                 g_printerr ("highlighting result %d page %d at %d,%d %dx%d\n",
 410                             i, results[i].page_num,
 411                             results[i].highlight_area.x,
 412                             results[i].highlight_area.y,
 413                             results[i].highlight_area.width,
 414                             results[i].highlight_area.height);
 415 #endif
 416                 if (results[i].page_num == current_page)
 417                         draw_rubberband (widget, view->bin_window,
 418                                          &results[i].highlight_area);
 419                 ++i;
 420         }
 421
 422         if (view->has_selection) {
 423                 draw_rubberband (widget, view->bin_window, &view->selection);
 424         }
 425 }
 426
 427 static gboolean
 428 ev_view_expose_event (GtkWidget      *widget,
 429                       GdkEventExpose *event)
 430 {
 431         EvView *view = EV_VIEW (widget);
 432
 433         if (event->window == view->bin_window)
 434                 expose_bin_window (widget, event);
 435         else
 436                 return GTK_WIDGET_CLASS (ev_view_parent_class)->expose_event (widget, event);
 437
 438         return FALSE;
 439 }
 440
 441 void
 442 ev_view_select_all (EvView *ev_view)
 443 {
 444         GtkWidget *widget = GTK_WIDGET (ev_view);
 445
 446         g_return_if_fail (EV_IS_VIEW (ev_view));
 447
 448         ev_view->has_selection = TRUE;
 449         ev_view->selection.x = ev_view->selection.y = 0;
 450         ev_view->selection.width = widget->requisition.width;
 451         ev_view->selection.height = widget->requisition.height;
 452
 453         gtk_widget_queue_draw (widget);
 454 }
 455
 456 void
 457 ev_view_copy (EvView *ev_view)
 458 {
 459         GtkClipboard *clipboard;
 460         char *text;
 461
 462         text = ev_document_get_text (ev_view->document, &ev_view->selection);
 463         clipboard = gtk_widget_get_clipboard (GTK_WIDGET (ev_view),
 464                                               GDK_SELECTION_CLIPBOARD);
 465         gtk_clipboard_set_text (clipboard, text, -1);
 466         g_free (text);
 467 }
 468
 469 static void
 470 ev_view_primary_get_cb (GtkClipboard     *clipboard,
 471                         GtkSelectionData *selection_data,
 472                         guint             info,
 473                         gpointer          data)
 474 {
 475         EvView *ev_view = EV_VIEW (data);
 476         char *text;
 477
 478         text = ev_document_get_text (ev_view->document, &ev_view->selection);
 479         gtk_selection_data_set_text (selection_data, text, -1);
 480 }
 481
 482 static void
 483 ev_view_primary_clear_cb (GtkClipboard *clipboard,
 484                           gpointer      data)
 485 {
 486         EvView *ev_view = EV_VIEW (data);
 487
 488         ev_view->has_selection = FALSE;
 489 }
 490
 491 static void
 492 ev_view_update_primary_selection (EvView *ev_view)
 493 {
 494         GtkClipboard *clipboard;
 495
 496         clipboard = gtk_widget_get_clipboard (GTK_WIDGET (ev_view),
 497                                               GDK_SELECTION_PRIMARY);
 498
 499         if (ev_view->has_selection) {
 500                 if (!gtk_clipboard_set_with_owner (clipboard,
 501                                                    targets,
 502                                                    G_N_ELEMENTS (targets),
 503                                                    ev_view_primary_get_cb,
 504                                                    ev_view_primary_clear_cb,
 505                                                    G_OBJECT (ev_view)))
 506                         ev_view_primary_clear_cb (clipboard, ev_view);
 507         } else {
 508                 if (gtk_clipboard_get_owner (clipboard) == G_OBJECT (ev_view))
 509                         gtk_clipboard_clear (clipboard);
 510         }
 511 }
 512
 513 static gboolean
 514 ev_view_button_press_event (GtkWidget      *widget,
 515                             GdkEventButton *event)
 516 {
 517         EvView *view = EV_VIEW (widget);
 518
 519         if (!GTK_WIDGET_HAS_FOCUS (widget)) {
 520                 gtk_widget_grab_focus (widget);
 521         }
 522
 523         view->pressed_button = event->button;
 524
 525         switch (event->button) {
 526                 case 1:
 527                         if (view->has_selection) {
 528                                 view->has_selection = FALSE;
 529                                 gtk_widget_queue_draw (widget);
 530                         }
 531
 532                         view->selection.x = event->x;
 533                         view->selection.y = event->y;
 534                         view->selection.width = 0;
 535                         view->selection.height = 0;
 536                         break;
 537         }
 538
 539         return TRUE;
 540 }
 541
 542 static char *
 543 status_message_from_link (EvLink *link)
 544 {
 545         EvLinkType type;
 546         char *msg;
 547         int page;
 548
 549         type = ev_link_get_link_type (link);
 550
 551         switch (type) {
 552                 case EV_LINK_TYPE_TITLE:
 553                         msg = g_strdup (ev_link_get_title (link));
 554                         break;
 555                 case EV_LINK_TYPE_PAGE:
 556                         page = ev_link_get_page (link);
 557                         msg = g_strdup_printf (_("Go to page %d"), page);
 558                         break;
 559                 case EV_LINK_TYPE_EXTERNAL_URI:
 560                         msg = g_strdup (ev_link_get_uri (link));
 561                         break;
 562                 default:
 563                         msg = NULL;
 564         }
 565
 566         return msg;
 567 }
 568
 569 static void
 570 ev_view_set_status (EvView *view, const char *message)
 571 {
 572         g_return_if_fail (EV_IS_VIEW (view));
 573
 574         if (message != view->status) {
 575                 g_free (view->status);
 576                 view->status = g_strdup (message);
 577                 g_object_notify (G_OBJECT (view), "status");
 578         }
 579 }
 580
 581 static void
 582 ev_view_set_find_status (EvView *view, const char *message)
 583 {
 584         g_return_if_fail (EV_IS_VIEW (view));
 585
 586         g_free (view->find_status);
 587         view->find_status = g_strdup (message);
 588         g_object_notify (G_OBJECT (view), "find-status");
 589 }
 590
 591 static void
 592 ev_view_set_cursor (EvView *view, EvViewCursor new_cursor)
 593 {
 594         GdkCursor *cursor = NULL;
 595         GdkDisplay *display;
 596         GtkWidget *widget;
 597
 598         if (view->cursor == new_cursor) {
 599                 return;
 600         }
 601
 602         widget = gtk_widget_get_toplevel (GTK_WIDGET (view));
 603         display = gtk_widget_get_display (widget);
 604         view->cursor = new_cursor;
 605
 606         switch (new_cursor) {
 607                 case EV_VIEW_CURSOR_NORMAL:
 608                         gdk_window_set_cursor (widget->window, NULL);
 609                         break;
 610                 case EV_VIEW_CURSOR_LINK:
 611                         cursor = gdk_cursor_new_for_display (display, GDK_HAND2);
 612                         break;
 613                 case EV_VIEW_CURSOR_WAIT:
 614                         cursor = gdk_cursor_new_for_display (display, GDK_WATCH);
 615                         break;
 616         }
 617
 618         if (cursor) {
 619                 gdk_window_set_cursor (widget->window, cursor);
 620                 gdk_cursor_unref (cursor);
 621                 gdk_flush();
 622         }
 623 }
 624
 625 static gboolean
 626 ev_view_motion_notify_event (GtkWidget      *widget,
 627                              GdkEventMotion *event)
 628 {
 629         EvView *view = EV_VIEW (widget);
 630
 631         if (view->pressed_button > 0) {
 632                 view->has_selection = TRUE;
 633                 view->selection.x = MIN (view->selection.x, event->x);
 634                 view->selection.y = MIN (view->selection.y, event->y);
 635                 view->selection.width = ABS (view->selection.x - event->x) + 1;
 636                 view->selection.height = ABS (view->selection.y - event->y) + 1;
 637         } else if (view->document) {
 638                 EvLink *link;
 639
 640                 link = ev_document_get_link (view->document, event->x, event->y);
 641                 if (link) {
 642                         char *msg;
 643
 644                         msg = status_message_from_link (link);
 645                         ev_view_set_status (view, msg);
 646                         ev_view_set_cursor (view, EV_VIEW_CURSOR_LINK);
 647                         g_free (msg);
 648
 649                         g_object_unref (link);
 650                 } else {
 651                         ev_view_set_status (view, NULL);
 652                         if (view->cursor == EV_VIEW_CURSOR_LINK) {
 653                                 ev_view_set_cursor (view, EV_VIEW_CURSOR_NORMAL);
 654                         }
 655                 }
 656         }
 657
 658         gtk_widget_queue_draw (widget);
 659
 660         return TRUE;
 661 }
 662
 663 static gboolean
 664 ev_view_button_release_event (GtkWidget      *widget,
 665                               GdkEventButton *event)
 666 {
 667         EvView *view = EV_VIEW (widget);
 668
 669         view->pressed_button = -1;
 670
 671         if (view->has_selection) {
 672                 ev_view_update_primary_selection (view);
 673         } else if (view->document) {
 674                 EvLink *link;
 675
 676                 link = ev_document_get_link (view->document,
 677                                              event->x,
 678                                              event->y);
 679                 if (link) {
 680                         ev_view_go_to_link (view, link);
 681                         g_object_unref (link);
 682                 }
 683         }
 684
 685         return FALSE;
 686 }
 687
 688 static void
 689 on_adjustment_value_changed (GtkAdjustment  *adjustment,
 690                              EvView *view)
 691 {
 692         view_update_adjustments (view);
 693 }
 694
 695 static void
 696 set_scroll_adjustment (EvView *view,
 697                        GtkOrientation  orientation,
 698                        GtkAdjustment  *adjustment)
 699 {
 700         GtkAdjustment **to_set;
 701
 702         if (orientation == GTK_ORIENTATION_HORIZONTAL)
 703                 to_set = &view->hadjustment;
 704         else
 705                 to_set = &view->vadjustment;
 706
 707         if (*to_set != adjustment) {
 708                 if (*to_set) {
 709                         g_signal_handlers_disconnect_by_func (*to_set,
 710                                                               (gpointer) on_adjustment_value_changed,
 711                                                               view);
 712                         g_object_unref (*to_set);
 713                 }
 714
 715                 *to_set = adjustment;
 716                 view_set_adjustment_values (view, orientation);
 717
 718                 if (*to_set) {
 719                         g_object_ref (*to_set);
 720                         g_signal_connect (*to_set, "value_changed",
 721                                           G_CALLBACK (on_adjustment_value_changed), view);
 722                 }
 723         }
 724 }
 725
 726 static void
 727 ev_view_set_scroll_adjustments (EvView *view,
 728                                 GtkAdjustment  *hadjustment,
 729                                 GtkAdjustment  *vadjustment)
 730 {
 731         set_scroll_adjustment (view, GTK_ORIENTATION_HORIZONTAL, hadjustment);
 732         set_scroll_adjustment (view, GTK_ORIENTATION_VERTICAL, vadjustment);
 733
 734         view_update_adjustments (view);
 735 }
 736
 737 static void
 738 add_scroll_binding (GtkBindingSet  *binding_set,
 739                     guint           keyval,
 740                     GtkScrollType   scroll,
 741                     gboolean        horizontal)
 742 {
 743   guint keypad_keyval = keyval - GDK_Left + GDK_KP_Left;
 744
 745   gtk_binding_entry_add_signal (binding_set, keyval, 0,
 746                                 "scroll_view", 2,
 747                                 GTK_TYPE_SCROLL_TYPE, scroll,
 748                                 G_TYPE_BOOLEAN, horizontal);
 749   gtk_binding_entry_add_signal (binding_set, keypad_keyval, 0,
 750                                 "scroll_view", 2,
 751                                 GTK_TYPE_SCROLL_TYPE, scroll,
 752                                 G_TYPE_BOOLEAN, horizontal);
 753 }
 754
 755 static void
 756 ev_view_scroll_view (EvView *view,
 757                      GtkScrollType scroll,
 758                      gboolean horizontal)
 759 {
 760         if (scroll == GTK_SCROLL_PAGE_BACKWARD) {
 761                 ev_view_set_page (view, ev_view_get_page (view) - 1);
 762         } else if (scroll == GTK_SCROLL_PAGE_FORWARD) {
 763                 ev_view_set_page (view, ev_view_get_page (view) + 1);
 764         } else {
 765                 GtkAdjustment *adjustment;
 766                 double value;
 767
 768                 if (horizontal) {
 769                         adjustment = view->hadjustment;
 770                 } else {
 771                         adjustment = view->vadjustment;
 772                 }
 773
 774                 value = adjustment->value;
 775
 776                 switch (scroll) {
 777                         case GTK_SCROLL_STEP_BACKWARD:
 778                                 value -= adjustment->step_increment;
 779                                 break;
 780                         case GTK_SCROLL_STEP_FORWARD:
 781                                 value += adjustment->step_increment;
 782                                 break;
 783                         default:
 784                                 break;
 785                 }
 786
 787                 value = CLAMP (value, adjustment->lower,
 788                                adjustment->upper - adjustment->page_size);
 789
 790                 gtk_adjustment_set_value (adjustment, value);
 791         }
 792 }
 793
 794 static void
 795 ev_view_set_property (GObject *object,
 796                       guint prop_id,
 797                       const GValue *value,
 798                       GParamSpec *pspec)
 799 {
 800         switch (prop_id)
 801         {
 802                 /* Read only */
 803                 case PROP_STATUS:
 804                 case PROP_FIND_STATUS:
 805                         break;
 806         }
 807 }
 808
 809 static void
 810 ev_view_get_property (GObject *object,
 811                       guint prop_id,
 812                       GValue *value,
 813                       GParamSpec *pspec)
 814 {
 815         EvView *view = EV_VIEW (object);
 816
 817         switch (prop_id)
 818         {
 819                 case PROP_STATUS:
 820                         g_value_set_string (value, view->status);
 821                         break;
 822                 case PROP_FIND_STATUS:
 823                         g_value_set_string (value, view->status);
 824                         break;
 825         }
 826 }
 827
 828 static void
 829 ev_view_class_init (EvViewClass *class)
 830 {
 831         GObjectClass *object_class = G_OBJECT_CLASS (class);
 832         GtkObjectClass *gtk_object_class = GTK_OBJECT_CLASS (class);
 833         GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
 834         GtkBindingSet *binding_set;
 835
 836         object_class->finalize = ev_view_finalize;
 837         object_class->set_property = ev_view_set_property;
 838         object_class->get_property = ev_view_get_property;
 839
 840         widget_class->expose_event = ev_view_expose_event;
 841         widget_class->button_press_event = ev_view_button_press_event;
 842         widget_class->motion_notify_event = ev_view_motion_notify_event;
 843         widget_class->button_release_event = ev_view_button_release_event;
 844         widget_class->size_request = ev_view_size_request;
 845         widget_class->size_allocate = ev_view_size_allocate;
 846         widget_class->realize = ev_view_realize;
 847         widget_class->unrealize = ev_view_unrealize;
 848         gtk_object_class->destroy = ev_view_destroy;
 849
 850         class->set_scroll_adjustments = ev_view_set_scroll_adjustments;
 851         class->scroll_view = ev_view_scroll_view;
 852
 853         widget_class->set_scroll_adjustments_signal =  g_signal_new ("set-scroll-adjustments",
 854                                                                      G_OBJECT_CLASS_TYPE (object_class),
 855                                                                      G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 856                                                                      G_STRUCT_OFFSET (EvViewClass, set_scroll_adjustments),
 857                                                                      NULL, NULL,
 858                                                                      ev_marshal_VOID__OBJECT_OBJECT,
 859                                                                      G_TYPE_NONE, 2,
 860                                                                      GTK_TYPE_ADJUSTMENT,
 861                                                                      GTK_TYPE_ADJUSTMENT);
 862         page_changed_signal = g_signal_new ("page-changed",
 863                                             G_OBJECT_CLASS_TYPE (object_class),
 864                                             G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 865                                             G_STRUCT_OFFSET (EvViewClass, page_changed),
 866                                             NULL, NULL,
 867                                             ev_marshal_VOID__NONE,
 868                                             G_TYPE_NONE, 0);
 869
 870         g_signal_new ("scroll_view",
 871                       G_TYPE_FROM_CLASS (object_class),
 872                       G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 873                       G_STRUCT_OFFSET (EvViewClass, scroll_view),
 874                       NULL, NULL,
 875                       ev_marshal_VOID__ENUM_BOOLEAN,
 876                       G_TYPE_NONE, 2,
 877                       GTK_TYPE_SCROLL_TYPE,
 878                       G_TYPE_BOOLEAN);
 879
 880         g_object_class_install_property (object_class,
 881                                          PROP_STATUS,
 882                                          g_param_spec_string ("status",
 883                                                               "Status Message",
 884                                                               "The status message",
 885                                                               NULL,
 886                                                               G_PARAM_READABLE));
 887
 888         g_object_class_install_property (object_class,
 889                                          PROP_STATUS,
 890                                          g_param_spec_string ("find-status",
 891                                                               "Find Status Message",
 892                                                               "The find status message",
 893                                                               NULL,
 894                                                               G_PARAM_READABLE));
 895
 896         binding_set = gtk_binding_set_by_class (class);
 897
 898         add_scroll_binding (binding_set, GDK_Left,  GTK_SCROLL_STEP_BACKWARD, TRUE);
 899         add_scroll_binding (binding_set, GDK_Right, GTK_SCROLL_STEP_FORWARD,  TRUE);
 900         add_scroll_binding (binding_set, GDK_Up,    GTK_SCROLL_STEP_BACKWARD, FALSE);
 901         add_scroll_binding (binding_set, GDK_Down,  GTK_SCROLL_STEP_FORWARD,  FALSE);
 902
 903         add_scroll_binding (binding_set, GDK_Page_Up,   GTK_SCROLL_PAGE_BACKWARD, FALSE);
 904         add_scroll_binding (binding_set, GDK_Page_Down, GTK_SCROLL_PAGE_FORWARD,  FALSE);
 905 }
 906
 907 static void
 908 ev_view_init (EvView *view)
 909 {
 910         GTK_WIDGET_SET_FLAGS (view, GTK_CAN_FOCUS);
 911
 912         view->scale = 1.0;
 913         view->pressed_button = -1;
 914         view->cursor = EV_VIEW_CURSOR_NORMAL;
 915
 916         view->find_results = g_array_new (FALSE,
 917                                           FALSE,
 918                                           sizeof (EvFindResult));
 919         view->results_on_this_page = 0;
 920         view->next_page_with_result = 0;
 921 }
 922
 923 static char *
 924 ev_view_get_find_status_message (EvView *view)
 925 {
 926         if (view->find_results->len == 0) {
 927                 if (view->find_percent_complete >= (1.0 - 1e-10)) {
 928                         return g_strdup (_("Not found"));
 929                 } else {
 930                         return g_strdup_printf (_("%3d%% remaining to search"),
 931                                                 (int) ((1.0 - view->find_percent_complete) * 100));
 932                 }
 933         } else if (view->results_on_this_page == 0) {
 934                 g_assert (view->next_page_with_result != 0);
 935                 return g_strdup_printf (_("Found on page %d"),
 936                                         view->next_page_with_result);
 937         } else {
 938                 return g_strdup_printf (_("%d found on this page"),
 939                                         view->results_on_this_page);
 940         }
 941 }
 942
 943 static void
 944 update_find_results (EvView *view)
 945 {
 946         const EvFindResult *results;
 947         int i;
 948         int on_this_page;
 949         int next_page_with_result;
 950         int earliest_page_with_result;
 951         int current_page;
 952         gboolean counts_changed;
 953
 954         results = (EvFindResult*) view->find_results->data;
 955         current_page = ev_document_get_page (view->document);
 956         next_page_with_result = 0;
 957         on_this_page = 0;
 958         earliest_page_with_result = 0;
 959
 960         i = 0;
 961         while (i < view->find_results->len) {
 962                 if (results[i].page_num == current_page) {
 963                         ++on_this_page;
 964                 } else {
 965                         int delta = results[i].page_num - current_page;
 966
 967                         if (delta > 0 && /* result on later page */
 968                             (next_page_with_result == 0 ||
 969                              results[i].page_num < next_page_with_result))
 970                                 next_page_with_result = results[i].page_num;
 971
 972                         if (delta < 0 && /* result on a previous page */
 973                             (earliest_page_with_result == 0 ||
 974                              results[i].page_num < earliest_page_with_result))
 975                                 earliest_page_with_result = results[i].page_num;
 976                 }
 977                 ++i;
 978         }
 979
 980         /* If earliest page is just the current page, there is no earliest page */
 981         if (earliest_page_with_result == current_page)
 982                 earliest_page_with_result = 0;
 983
 984         /* If no next page, then wrap and the wrapped page is the next page */
 985         if (next_page_with_result == 0)
 986                 next_page_with_result = earliest_page_with_result;
 987
 988         counts_changed = FALSE;
 989         if (on_this_page != view->results_on_this_page ||
 990             next_page_with_result != view->next_page_with_result) {
 991                 view->results_on_this_page = on_this_page;
 992                 view->next_page_with_result = next_page_with_result;
 993                 counts_changed = TRUE;
 994         }
 995
 996         if (counts_changed ||
 997             view->find_results->len == 0) {
 998                 char *message;
 999
1000                 message = ev_view_get_find_status_message (view);
1001                 ev_view_set_find_status (view, message);
1002                 g_free (message);
1003         }
1004 }
1005
1006 static void
1007 found_results_callback (EvDocument         *document,
1008                         const EvFindResult *results,
1009                         int                 n_results,
1010                         double              percent_complete,
1011                         void               *data)
1012 {
1013   EvView *view = EV_VIEW (data);
1014
1015   g_array_set_size (view->find_results, 0);
1016
1017   if (n_results > 0)
1018           g_array_append_vals (view->find_results,
1019                                results, n_results);
1020
1021 #if 0
1022   {
1023           int i;
1024
1025           g_printerr ("%d results %d%%: ", n_results,
1026                       (int) (percent_complete * 100));
1027           i = 0;
1028           while (i < n_results) {
1029                   g_printerr ("%d ", results[i].page_num);
1030                   ++i;
1031           }
1032           g_printerr ("\n");
1033   }
1034 #endif
1035
1036   view->find_percent_complete = percent_complete;
1037   update_find_results (view);
1038
1039   gtk_widget_queue_draw (GTK_WIDGET (view));
1040 }
1041
1042 static void
1043 document_changed_callback (EvDocument *document,
1044                            EvView     *view)
1045 {
1046         gtk_widget_queue_draw (GTK_WIDGET (view));
1047         ev_view_set_cursor (view, EV_VIEW_CURSOR_NORMAL);
1048 }
1049
1050 /*** Public API ***/
1051
1052 GtkWidget*
1053 ev_view_new (void)
1054 {
1055         return g_object_new (EV_TYPE_VIEW, NULL);
1056 }
1057
1058 void
1059 ev_view_set_document (EvView     *view,
1060                       EvDocument *document)
1061 {
1062         g_return_if_fail (EV_IS_VIEW (view));
1063
1064         if (document != view->document) {
1065                 if (view->document) {
1066                         g_signal_handlers_disconnect_by_func (view->document,
1067                                                               found_results_callback,
1068                                                               view);
1069                         g_array_set_size (view->find_results, 0);
1070                         view->results_on_this_page = 0;
1071                         view->next_page_with_result = 0;
1072
1073                         g_object_unref (view->document);
1074                 }
1075
1076                 view->document = document;
1077
1078                 if (view->document) {
1079                         g_object_ref (view->document);
1080                         if (EV_IS_DOCUMENT_FIND (view->document))
1081                                 g_signal_connect (view->document,
1082                                                   "found",
1083                                                   G_CALLBACK (found_results_callback),
1084                                                   view);
1085                         g_signal_connect (view->document,
1086                                           "changed",
1087                                           G_CALLBACK (document_changed_callback),
1088                                           view);
1089                 }
1090
1091                 if (GTK_WIDGET_REALIZED (view))
1092                         ev_document_set_target (view->document, view->bin_window);
1093
1094                 gtk_widget_queue_resize (GTK_WIDGET (view));
1095
1096                 g_signal_emit (view, page_changed_signal, 0);
1097         }
1098 }
1099
1100 static void
1101 set_document_page (EvView *view, int page)
1102 {
1103         if (view->document) {
1104                 int old_page = ev_document_get_page (view->document);
1105
1106                 if (old_page != page) {
1107                         ev_view_set_cursor (view, EV_VIEW_CURSOR_WAIT);
1108                         ev_document_set_page (view->document, page);
1109                 }
1110
1111                 if (old_page != ev_document_get_page (view->document)) {
1112                         g_signal_emit (view, page_changed_signal, 0);
1113
1114                         view->find_percent_complete = 0.0;
1115                         update_find_results (view);
1116                 }
1117         }
1118 }
1119
1120 static void
1121 go_to_link (EvView *view, EvLink *link)
1122 {
1123         EvLinkType type;
1124         const char *uri;
1125         int page;
1126
1127         type = ev_link_get_link_type (link);
1128
1129         switch (type) {
1130                 case EV_LINK_TYPE_TITLE:
1131                         break;
1132                 case EV_LINK_TYPE_PAGE:
1133                         page = ev_link_get_page (link);
1134                         set_document_page (view, page);
1135                         break;
1136                 case EV_LINK_TYPE_EXTERNAL_URI:
1137                         uri = ev_link_get_uri (link);
1138                         gnome_vfs_url_show (uri);
1139                         break;
1140         }
1141 }
1142
1143 void
1144 ev_view_go_to_link (EvView *view, EvLink *link)
1145 {
1146         EvLinkType type;
1147
1148         go_to_link (view, link);
1149
1150         type = ev_link_get_link_type (link);
1151         if (type == EV_LINK_TYPE_PAGE) {
1152                 ev_history_add_link (view->history, link);
1153         }
1154 }
1155
1156 static void
1157 go_to_index (EvView *view, int index)
1158 {
1159         EvLink *link;
1160
1161         link = ev_history_get_link_nth (view->history, index);
1162         g_return_if_fail (link != NULL);
1163
1164         go_to_link (view, link);
1165 }
1166
1167 gboolean
1168 ev_view_can_go_back (EvView *view)
1169 {
1170         int index, n;
1171
1172         if (view->history == NULL) {
1173                 return FALSE;
1174         }
1175
1176         index = ev_history_get_current_index (view->history);
1177         n = ev_history_get_n_links (view->history);
1178
1179         if (n > 0) {
1180                 return index != MAX (0, index - 1);
1181         } else {
1182                 return FALSE;
1183         }
1184 }
1185
1186 void
1187 ev_view_go_back (EvView *view)
1188 {
1189         int index, n;
1190
1191         g_return_if_fail (EV_IS_HISTORY (view->history));
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                 index = MAX (0, index - 1);
1198                 ev_history_set_current_index (view->history, index);
1199         }
1200 }
1201
1202 gboolean
1203 ev_view_can_go_forward (EvView *view)
1204 {
1205         int index, n;
1206
1207         if (view->history == NULL) {
1208                 return FALSE;
1209         }
1210
1211         index = ev_history_get_current_index (view->history);
1212         n = ev_history_get_n_links (view->history);
1213
1214         if (n > 0) {
1215                 return  index != MIN (n - 1, index + 1);
1216         } else {
1217                 return FALSE;
1218         }
1219 }
1220
1221 void
1222 ev_view_go_forward (EvView *view)
1223 {
1224         int index, n;
1225
1226         g_return_if_fail (EV_IS_HISTORY (view->history));
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                 index = MIN (n - 1, index + 1);
1233                 ev_history_set_current_index (view->history, index);
1234         }
1235 }
1236
1237
1238 void
1239 ev_view_set_page (EvView *view,
1240                   int     page)
1241 {
1242         g_return_if_fail (EV_IS_VIEW (view));
1243         g_return_if_fail (EV_IS_HISTORY (view->history));
1244
1245         set_document_page (view, page);
1246         ev_history_add_page (view->history, page);
1247 }
1248
1249 int
1250 ev_view_get_page (EvView *view)
1251 {
1252         if (view->document)
1253                 return ev_document_get_page (view->document);
1254         else
1255                 return 1;
1256 }
1257
1258 #define ZOOM_IN_FACTOR  1.2
1259 #define ZOOM_OUT_FACTOR (1.0/ZOOM_IN_FACTOR)
1260
1261 #define MIN_SCALE 0.05409
1262 #define MAX_SCALE 18.4884
1263
1264 static void
1265 ev_view_zoom (EvView   *view,
1266               double    factor,
1267               gboolean  relative)
1268 {
1269         double scale;
1270
1271         if (relative)
1272                 scale = view->scale * factor;
1273         else
1274                 scale = factor;
1275
1276         view->scale = CLAMP (scale, MIN_SCALE, MAX_SCALE);
1277
1278         ev_document_set_scale (view->document, view->scale);
1279
1280         gtk_widget_queue_resize (GTK_WIDGET (view));
1281 }
1282
1283 void
1284 ev_view_zoom_in (EvView *view)
1285 {
1286         ev_view_zoom (view, ZOOM_IN_FACTOR, TRUE);
1287 }
1288
1289 void
1290 ev_view_zoom_out (EvView *view)
1291 {
1292         ev_view_zoom (view, ZOOM_OUT_FACTOR, TRUE);
1293 }
1294
1295 void
1296 ev_view_normal_size (EvView *view)
1297 {
1298         ev_view_zoom (view, 1.0, FALSE);
1299 }
1300
1301 void
1302 ev_view_best_fit (EvView *view)
1303 {
1304         double scale;
1305         int width, height;
1306
1307         width = height = 0;
1308         ev_document_get_page_size (view->document, &width, &height);
1309
1310         scale = 1.0;
1311         if (width != 0 && height != 0) {
1312                 double scale_w, scale_h;
1313
1314                 scale_w = (double)GTK_WIDGET (view)->allocation.width * view->scale / width;
1315                 scale_h = (double)GTK_WIDGET (view)->allocation.height * view->scale / height;
1316
1317                 scale = (scale_w < scale_h) ? scale_w : scale_h;
1318         }
1319
1320         ev_view_zoom (view, scale, FALSE);
1321 }
1322
1323 void
1324 ev_view_fit_width (EvView *view)
1325 {
1326         double scale = 1.0;
1327         int width;
1328
1329         width = 0;
1330         ev_document_get_page_size (view->document, &width, NULL);
1331
1332         scale = 1.0;
1333         if (width != 0)
1334                 scale = (double)GTK_WIDGET (view)->allocation.width * view->scale / width;
1335
1336         ev_view_zoom (view, scale, FALSE);
1337 }
1338
1339 static void
1340 history_index_changed_cb (EvHistory  *history,
1341                           GParamSpec *pspec,
1342                           EvView     *view)
1343 {
1344         int index;
1345
1346         index = ev_history_get_current_index (history);
1347         go_to_index (view, index);
1348 }
1349
1350 void
1351 ev_view_set_history (EvView     *view,
1352                      EvHistory  *history)
1353 {
1354         if (view->history) {
1355                 g_object_unref (view->history);
1356         }
1357
1358         view->history = g_object_ref (history);
1359         ev_history_add_page (view->history, ev_view_get_page (view));
1360
1361         g_signal_connect (view->history, "notify::index",
1362                           G_CALLBACK (history_index_changed_cb),
1363                           view);
1364 }
1365
1366 const char *
1367 ev_view_get_status (EvView *view)
1368 {
1369         g_return_val_if_fail (EV_IS_VIEW (view), NULL);
1370
1371         return view->status;
1372 }
1373
1374 const char *
1375 ev_view_get_find_status (EvView *view)
1376 {
1377         g_return_val_if_fail (EV_IS_VIEW (view), NULL);
1378
1379         return view->find_status;
1380 }
1381
1382