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
  69         GdkWindow *bin_window;
  70
  71         char *status;
  72         char *find_status;
  73
  74         int scroll_x;
  75         int scroll_y;
  76
  77         gboolean pressed_button;
  78         gboolean has_selection;
  79         GdkPoint selection_start;
  80         GdkRectangle selection;
  81         EvViewCursor cursor;
  82
  83         GtkAdjustment *hadjustment;
  84         GtkAdjustment *vadjustment;
  85
  86         int find_page;
  87         int find_result;
  88
  89         double scale;
  90 };
  91
  92 struct _EvViewClass {
  93         GtkWidgetClass parent_class;
  94
  95         void    (*set_scroll_adjustments) (EvView         *view,
  96                                            GtkAdjustment  *hadjustment,
  97                                            GtkAdjustment  *vadjustment);
  98         void    (*scroll_view)            (EvView         *view,
  99                                            GtkScrollType   scroll,
 100                                            gboolean        horizontal);
 101
 102         /* Should this be notify::page? */
 103         void    (*page_changed)           (EvView         *view);
 104 };
 105
 106 static guint page_changed_signal = 0;
 107
 108 static void ev_view_set_scroll_adjustments (EvView         *view,
 109                                             GtkAdjustment  *hadjustment,
 110                                             GtkAdjustment  *vadjustment);
 111
 112 G_DEFINE_TYPE (EvView, ev_view, GTK_TYPE_WIDGET)
 113
 114 /*** Helper functions ***/
 115
 116 static void
 117 view_update_adjustments (EvView *view)
 118 {
 119         int old_x = view->scroll_x;
 120         int old_y = view->scroll_y;
 121
 122         if (view->hadjustment)
 123                 view->scroll_x = view->hadjustment->value;
 124         else
 125                 view->scroll_x = 0;
 126
 127         if (view->vadjustment)
 128                 view->scroll_y = view->vadjustment->value;
 129         else
 130                 view->scroll_y = 0;
 131
 132         if (GTK_WIDGET_REALIZED (view) &&
 133             (view->scroll_x != old_x || view->scroll_y != old_y)) {
 134                 gdk_window_move (view->bin_window, - view->scroll_x, - view->scroll_y);
 135                 gdk_window_process_updates (view->bin_window, TRUE);
 136         }
 137 }
 138
 139 static void
 140 view_set_adjustment_values (EvView         *view,
 141                             GtkOrientation  orientation)
 142 {
 143         GtkWidget *widget = GTK_WIDGET (view);
 144         GtkAdjustment *adjustment;
 145         gboolean value_changed = FALSE;
 146         int requisition;
 147         int allocation;
 148
 149         if (orientation == GTK_ORIENTATION_HORIZONTAL)  {
 150                 requisition = widget->requisition.width;
 151                 allocation = widget->allocation.width;
 152                 adjustment = view->hadjustment;
 153         } else {
 154                 requisition = widget->requisition.height;
 155                 allocation = widget->allocation.height;
 156                 adjustment = view->vadjustment;
 157         }
 158
 159         if (!adjustment)
 160                 return;
 161
 162         adjustment->page_size = allocation;
 163         adjustment->step_increment = allocation * 0.1;
 164         adjustment->page_increment = allocation * 0.9;
 165         adjustment->lower = 0;
 166         adjustment->upper = MAX (allocation, requisition);
 167
 168         if (adjustment->value > adjustment->upper - adjustment->page_size) {
 169                 adjustment->value = adjustment->upper - adjustment->page_size;
 170                 value_changed = TRUE;
 171         }
 172
 173         gtk_adjustment_changed (adjustment);
 174         if (value_changed)
 175                 gtk_adjustment_value_changed (adjustment);
 176 }
 177
 178 /*** Virtual function implementations ***/
 179
 180 static void
 181 ev_view_finalize (GObject *object)
 182 {
 183         EvView *view = EV_VIEW (object);
 184
 185         if (view->document)
 186                 g_object_unref (view->document);
 187
 188         ev_view_set_scroll_adjustments (view, NULL, NULL);
 189
 190         G_OBJECT_CLASS (ev_view_parent_class)->finalize (object);
 191 }
 192
 193 static void
 194 ev_view_destroy (GtkObject *object)
 195 {
 196         EvView *view = EV_VIEW (object);
 197
 198         ev_view_set_scroll_adjustments (view, NULL, NULL);
 199
 200         GTK_OBJECT_CLASS (ev_view_parent_class)->destroy (object);
 201 }
 202
 203 static void
 204 ev_view_size_request (GtkWidget      *widget,
 205                       GtkRequisition *requisition)
 206 {
 207         EvView *view = EV_VIEW (widget);
 208
 209         if (GTK_WIDGET_REALIZED (widget)) {
 210                 if (view->document) {
 211                         ev_document_get_page_size (view->document,
 212                                                    &requisition->width,
 213                                                    &requisition->height);
 214                 } else {
 215                         requisition->width = 10;
 216                         requisition->height = 10;
 217                 }
 218
 219                 requisition->width += 2;
 220                 requisition->height += 2;
 221         }
 222
 223 }
 224
 225 static void
 226 ev_view_size_allocate (GtkWidget      *widget,
 227                        GtkAllocation  *allocation)
 228 {
 229         EvView *view = EV_VIEW (widget);
 230
 231         GTK_WIDGET_CLASS (ev_view_parent_class)->size_allocate (widget, allocation);
 232
 233         view_set_adjustment_values (view, GTK_ORIENTATION_HORIZONTAL);
 234         view_set_adjustment_values (view, GTK_ORIENTATION_VERTICAL);
 235
 236         if (GTK_WIDGET_REALIZED (widget)) {
 237                 gdk_window_resize (view->bin_window,
 238                                    MAX (widget->allocation.width, widget->requisition.width),
 239                                    MAX (widget->allocation.height, widget->requisition.height));
 240         }
 241 }
 242
 243 static void
 244 ev_view_realize (GtkWidget *widget)
 245 {
 246         EvView *view = EV_VIEW (widget);
 247         GdkWindowAttr attributes;
 248
 249         GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 250
 251         attributes.window_type = GDK_WINDOW_CHILD;
 252         attributes.wclass = GDK_INPUT_OUTPUT;
 253         attributes.visual = gtk_widget_get_visual (widget);
 254         attributes.colormap = gtk_widget_get_colormap (widget);
 255
 256         attributes.x = widget->allocation.x;
 257         attributes.y = widget->allocation.y;
 258         attributes.width = widget->allocation.width;
 259         attributes.height = widget->allocation.height;
 260         attributes.event_mask = 0;
 261
 262         widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
 263                                          &attributes,
 264                                          GDK_WA_X | GDK_WA_Y |
 265                                          GDK_WA_COLORMAP |
 266                                          GDK_WA_VISUAL);
 267         gdk_window_set_user_data (widget->window, widget);
 268         widget->style = gtk_style_attach (widget->style, widget->window);
 269
 270         attributes.x = 0;
 271         attributes.y = 0;
 272         attributes.width = MAX (widget->allocation.width, widget->requisition.width);
 273         attributes.height = MAX (widget->allocation.height, widget->requisition.height);
 274         attributes.event_mask = GDK_EXPOSURE_MASK |
 275                                 GDK_BUTTON_PRESS_MASK |
 276                                 GDK_BUTTON_RELEASE_MASK |
 277                                 GDK_SCROLL_MASK |
 278                                 GDK_KEY_PRESS_MASK |
 279                                 GDK_POINTER_MOTION_MASK;
 280
 281         view->bin_window = gdk_window_new (widget->window,
 282                                            &attributes,
 283                                            GDK_WA_X | GDK_WA_Y |
 284                                            GDK_WA_COLORMAP |
 285                                            GDK_WA_VISUAL);
 286         gdk_window_set_user_data (view->bin_window, widget);
 287         gdk_window_show (view->bin_window);
 288
 289         widget->style = gtk_style_attach (widget->style, view->bin_window);
 290         gdk_window_set_background (view->bin_window, &widget->style->mid[widget->state]);
 291
 292         if (view->document) {
 293                 ev_document_set_target (view->document, view->bin_window);
 294
 295                 /* We can't get page size without a target, so we have to
 296                  * queue a size request at realization. Could be fixed
 297                  * with EvDocument changes to allow setting a GdkScreen
 298                  * without setting a target.
 299                  */
 300                 gtk_widget_queue_resize (widget);
 301         }
 302 }
 303
 304 static void
 305 ev_view_unrealize (GtkWidget *widget)
 306 {
 307         EvView *view = EV_VIEW (widget);
 308
 309         if (view->document)
 310                 ev_document_set_target (view->document, NULL);
 311
 312         gdk_window_set_user_data (view->bin_window, NULL);
 313         gdk_window_destroy (view->bin_window);
 314         view->bin_window = NULL;
 315
 316         GTK_WIDGET_CLASS (ev_view_parent_class)->unrealize (widget);
 317 }
 318
 319 static guint32
 320 ev_gdk_color_to_rgb (const GdkColor *color)
 321 {
 322   guint32 result;
 323   result = (0xff0000 | (color->red & 0xff00));
 324   result <<= 8;
 325   result |= ((color->green & 0xff00) | (color->blue >> 8));
 326   return result;
 327 }
 328
 329 static void
 330 draw_rubberband (GtkWidget *widget, GdkWindow *window,
 331                  const GdkRectangle *rect, guchar alpha)
 332 {
 333         GdkGC *gc;
 334         GdkPixbuf *pixbuf;
 335         GdkColor *fill_color_gdk;
 336         guint fill_color;
 337
 338         fill_color_gdk = gdk_color_copy (&GTK_WIDGET (widget)->style->base[GTK_STATE_SELECTED]);
 339         fill_color = ev_gdk_color_to_rgb (fill_color_gdk) << 8 | alpha;
 340
 341         pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8,
 342                                  rect->width, rect->height);
 343         gdk_pixbuf_fill (pixbuf, fill_color);
 344
 345         gdk_draw_pixbuf (window, NULL, pixbuf,
 346                          0, 0,
 347                          rect->x,rect->y,
 348                          rect->width, rect->height,
 349                          GDK_RGB_DITHER_NONE,
 350                          0, 0);
 351
 352         g_object_unref (pixbuf);
 353
 354         gc = gdk_gc_new (window);
 355         gdk_gc_set_rgb_fg_color (gc, fill_color_gdk);
 356         gdk_draw_rectangle (window, gc, FALSE,
 357                             rect->x, rect->y,
 358                             rect->width - 1,
 359                             rect->height - 1);
 360         g_object_unref (gc);
 361
 362         gdk_color_free (fill_color_gdk);
 363 }
 364
 365 static void
 366 highlight_find_results (EvView *view)
 367 {
 368         EvDocumentFind *find = EV_DOCUMENT_FIND (view->document);
 369         int i, results;
 370
 371         results = ev_document_find_get_n_results (find);
 372
 373         for (i = 0; i < results; i++) {
 374                 GdkRectangle rectangle;
 375                 guchar alpha;
 376
 377                 alpha = (i == view->find_result) ? 0x90 : 0x20;
 378                 ev_document_find_get_result (find, i, &rectangle);
 379                 draw_rubberband (GTK_WIDGET (view), view->bin_window,
 380                                  &rectangle, alpha);
 381         }
 382 }
 383
 384 static void
 385 expose_bin_window (GtkWidget      *widget,
 386                    GdkEventExpose *event)
 387 {
 388         EvView *view = EV_VIEW (widget);
 389         int x_offset, y_offset;
 390
 391         if (view->document == NULL)
 392                 return;
 393
 394         x_offset = MAX (0, (widget->allocation.width -
 395                             widget->requisition.width) / 2);
 396         y_offset = MAX (0, (widget->allocation.height -
 397                             widget->requisition.height) / 2);
 398         gdk_draw_rectangle (view->bin_window,
 399                             widget->style->black_gc,
 400                             FALSE,
 401                             x_offset,
 402                             y_offset,
 403                             widget->requisition.width - 1,
 404                             widget->requisition.height - 1);
 405
 406         ev_document_set_page_offset (view->document,
 407                                      x_offset + 1,
 408                                      y_offset + 1);
 409
 410         ev_document_render (view->document,
 411                             event->area.x, event->area.y,
 412                             event->area.width, event->area.height);
 413
 414         if (EV_IS_DOCUMENT_FIND (view->document)) {
 415                 highlight_find_results (view);
 416         }
 417
 418         if (view->has_selection) {
 419                 draw_rubberband (widget, view->bin_window,
 420                                  &view->selection, 0x40);
 421         }
 422 }
 423
 424 static gboolean
 425 ev_view_expose_event (GtkWidget      *widget,
 426                       GdkEventExpose *event)
 427 {
 428         EvView *view = EV_VIEW (widget);
 429
 430         if (event->window == view->bin_window)
 431                 expose_bin_window (widget, event);
 432         else
 433                 return GTK_WIDGET_CLASS (ev_view_parent_class)->expose_event (widget, event);
 434
 435         return FALSE;
 436 }
 437
 438 void
 439 ev_view_select_all (EvView *ev_view)
 440 {
 441         GtkWidget *widget = GTK_WIDGET (ev_view);
 442
 443         g_return_if_fail (EV_IS_VIEW (ev_view));
 444
 445         ev_view->has_selection = TRUE;
 446         ev_view->selection.x = ev_view->selection.y = 0;
 447         ev_view->selection.width = widget->requisition.width;
 448         ev_view->selection.height = widget->requisition.height;
 449
 450         gtk_widget_queue_draw (widget);
 451 }
 452
 453 void
 454 ev_view_copy (EvView *ev_view)
 455 {
 456         GtkClipboard *clipboard;
 457         char *text;
 458
 459         text = ev_document_get_text (ev_view->document, &ev_view->selection);
 460         clipboard = gtk_widget_get_clipboard (GTK_WIDGET (ev_view),
 461                                               GDK_SELECTION_CLIPBOARD);
 462         gtk_clipboard_set_text (clipboard, text, -1);
 463         g_free (text);
 464 }
 465
 466 static void
 467 ev_view_primary_get_cb (GtkClipboard     *clipboard,
 468                         GtkSelectionData *selection_data,
 469                         guint             info,
 470                         gpointer          data)
 471 {
 472         EvView *ev_view = EV_VIEW (data);
 473         char *text;
 474
 475         text = ev_document_get_text (ev_view->document, &ev_view->selection);
 476         gtk_selection_data_set_text (selection_data, text, -1);
 477 }
 478
 479 static void
 480 ev_view_primary_clear_cb (GtkClipboard *clipboard,
 481                           gpointer      data)
 482 {
 483         EvView *ev_view = EV_VIEW (data);
 484
 485         ev_view->has_selection = FALSE;
 486 }
 487
 488 static void
 489 ev_view_update_primary_selection (EvView *ev_view)
 490 {
 491         GtkClipboard *clipboard;
 492
 493         clipboard = gtk_widget_get_clipboard (GTK_WIDGET (ev_view),
 494                                               GDK_SELECTION_PRIMARY);
 495
 496         if (ev_view->has_selection) {
 497                 if (!gtk_clipboard_set_with_owner (clipboard,
 498                                                    targets,
 499                                                    G_N_ELEMENTS (targets),
 500                                                    ev_view_primary_get_cb,
 501                                                    ev_view_primary_clear_cb,
 502                                                    G_OBJECT (ev_view)))
 503                         ev_view_primary_clear_cb (clipboard, ev_view);
 504         } else {
 505                 if (gtk_clipboard_get_owner (clipboard) == G_OBJECT (ev_view))
 506                         gtk_clipboard_clear (clipboard);
 507         }
 508 }
 509
 510 static gboolean
 511 ev_view_button_press_event (GtkWidget      *widget,
 512                             GdkEventButton *event)
 513 {
 514         EvView *view = EV_VIEW (widget);
 515
 516         if (!GTK_WIDGET_HAS_FOCUS (widget)) {
 517                 gtk_widget_grab_focus (widget);
 518         }
 519
 520         view->pressed_button = event->button;
 521
 522         switch (event->button) {
 523                 case 1:
 524                         if (view->has_selection) {
 525                                 view->has_selection = FALSE;
 526                                 gtk_widget_queue_draw (widget);
 527                         }
 528
 529                         view->selection_start.x = event->x;
 530                         view->selection_start.y = event->y;
 531                         break;
 532         }
 533
 534         return TRUE;
 535 }
 536
 537 static char *
 538 status_message_from_link (EvLink *link)
 539 {
 540         EvLinkType type;
 541         char *msg;
 542         int page;
 543
 544         type = ev_link_get_link_type (link);
 545
 546         switch (type) {
 547                 case EV_LINK_TYPE_TITLE:
 548                         msg = g_strdup (ev_link_get_title (link));
 549                         break;
 550                 case EV_LINK_TYPE_PAGE:
 551                         page = ev_link_get_page (link);
 552                         msg = g_strdup_printf (_("Go to page %d"), page);
 553                         break;
 554                 case EV_LINK_TYPE_EXTERNAL_URI:
 555                         msg = g_strdup (ev_link_get_uri (link));
 556                         break;
 557                 default:
 558                         msg = NULL;
 559         }
 560
 561         return msg;
 562 }
 563
 564 static void
 565 ev_view_set_status (EvView *view, const char *message)
 566 {
 567         g_return_if_fail (EV_IS_VIEW (view));
 568
 569         if (message != view->status) {
 570                 g_free (view->status);
 571                 view->status = g_strdup (message);
 572                 g_object_notify (G_OBJECT (view), "status");
 573         }
 574 }
 575
 576 static void
 577 ev_view_set_find_status (EvView *view, const char *message)
 578 {
 579         g_return_if_fail (EV_IS_VIEW (view));
 580
 581         g_free (view->find_status);
 582         view->find_status = g_strdup (message);
 583         g_object_notify (G_OBJECT (view), "find-status");
 584 }
 585
 586
 587 static void
 588 ev_view_set_cursor (EvView *view, EvViewCursor new_cursor)
 589 {
 590         GdkCursor *cursor = NULL;
 591         GdkDisplay *display;
 592         GtkWidget *widget;
 593
 594         if (view->cursor == new_cursor) {
 595                 return;
 596         }
 597
 598         widget = gtk_widget_get_toplevel (GTK_WIDGET (view));
 599         display = gtk_widget_get_display (widget);
 600         view->cursor = new_cursor;
 601
 602         switch (new_cursor) {
 603                 case EV_VIEW_CURSOR_NORMAL:
 604                         gdk_window_set_cursor (widget->window, NULL);
 605                         break;
 606                 case EV_VIEW_CURSOR_LINK:
 607                         cursor = gdk_cursor_new_for_display (display, GDK_HAND2);
 608                         break;
 609                 case EV_VIEW_CURSOR_WAIT:
 610                         cursor = gdk_cursor_new_for_display (display, GDK_WATCH);
 611                         break;
 612         }
 613
 614         if (cursor) {
 615                 gdk_window_set_cursor (widget->window, cursor);
 616                 gdk_cursor_unref (cursor);
 617                 gdk_flush();
 618         }
 619 }
 620
 621 static gboolean
 622 ev_view_motion_notify_event (GtkWidget      *widget,
 623                              GdkEventMotion *event)
 624 {
 625         EvView *view = EV_VIEW (widget);
 626
 627         if (view->pressed_button > 0) {
 628                 view->has_selection = TRUE;
 629                 view->selection.x = MIN (view->selection_start.x, event->x);
 630                 view->selection.y = MIN (view->selection_start.y, event->y);
 631                 view->selection.width = ABS (view->selection_start.x - event->x) + 1;
 632                 view->selection.height = ABS (view->selection_start.y - event->y) + 1;
 633
 634                 gtk_widget_queue_draw (widget);
 635         } else if (view->document) {
 636                 EvLink *link;
 637
 638                 link = ev_document_get_link (view->document, event->x, event->y);
 639                 if (link) {
 640                         char *msg;
 641
 642                         msg = status_message_from_link (link);
 643                         ev_view_set_status (view, msg);
 644                         ev_view_set_cursor (view, EV_VIEW_CURSOR_LINK);
 645                         g_free (msg);
 646
 647                         g_object_unref (link);
 648                 } else {
 649                         ev_view_set_status (view, NULL);
 650                         if (view->cursor == EV_VIEW_CURSOR_LINK) {
 651                                 ev_view_set_cursor (view, EV_VIEW_CURSOR_NORMAL);
 652                         }
 653                 }
 654         }
 655
 656         return TRUE;
 657 }
 658
 659 static gboolean
 660 ev_view_button_release_event (GtkWidget      *widget,
 661                               GdkEventButton *event)
 662 {
 663         EvView *view = EV_VIEW (widget);
 664
 665         view->pressed_button = -1;
 666
 667         if (view->has_selection) {
 668                 ev_view_update_primary_selection (view);
 669         } else if (view->document) {
 670                 EvLink *link;
 671
 672                 link = ev_document_get_link (view->document,
 673                                              event->x,
 674                                              event->y);
 675                 if (link) {
 676                         ev_view_go_to_link (view, link);
 677                         g_object_unref (link);
 678                 }
 679         }
 680
 681         return FALSE;
 682 }
 683
 684 static void
 685 on_adjustment_value_changed (GtkAdjustment  *adjustment,
 686                              EvView *view)
 687 {
 688         view_update_adjustments (view);
 689 }
 690
 691 static void
 692 set_scroll_adjustment (EvView *view,
 693                        GtkOrientation  orientation,
 694                        GtkAdjustment  *adjustment)
 695 {
 696         GtkAdjustment **to_set;
 697
 698         if (orientation == GTK_ORIENTATION_HORIZONTAL)
 699                 to_set = &view->hadjustment;
 700         else
 701                 to_set = &view->vadjustment;
 702
 703         if (*to_set != adjustment) {
 704                 if (*to_set) {
 705                         g_signal_handlers_disconnect_by_func (*to_set,
 706                                                               (gpointer) on_adjustment_value_changed,
 707                                                               view);
 708                         g_object_unref (*to_set);
 709                 }
 710
 711                 *to_set = adjustment;
 712                 view_set_adjustment_values (view, orientation);
 713
 714                 if (*to_set) {
 715                         g_object_ref (*to_set);
 716                         g_signal_connect (*to_set, "value_changed",
 717                                           G_CALLBACK (on_adjustment_value_changed), view);
 718                 }
 719         }
 720 }
 721
 722 static void
 723 ev_view_set_scroll_adjustments (EvView *view,
 724                                 GtkAdjustment  *hadjustment,
 725                                 GtkAdjustment  *vadjustment)
 726 {
 727         set_scroll_adjustment (view, GTK_ORIENTATION_HORIZONTAL, hadjustment);
 728         set_scroll_adjustment (view, GTK_ORIENTATION_VERTICAL, vadjustment);
 729
 730         view_update_adjustments (view);
 731 }
 732
 733 static void
 734 add_scroll_binding (GtkBindingSet  *binding_set,
 735                     guint           keyval,
 736                     GtkScrollType   scroll,
 737                     gboolean        horizontal)
 738 {
 739   guint keypad_keyval = keyval - GDK_Left + GDK_KP_Left;
 740
 741   gtk_binding_entry_add_signal (binding_set, keyval, 0,
 742                                 "scroll_view", 2,
 743                                 GTK_TYPE_SCROLL_TYPE, scroll,
 744                                 G_TYPE_BOOLEAN, horizontal);
 745   gtk_binding_entry_add_signal (binding_set, keypad_keyval, 0,
 746                                 "scroll_view", 2,
 747                                 GTK_TYPE_SCROLL_TYPE, scroll,
 748                                 G_TYPE_BOOLEAN, horizontal);
 749 }
 750
 751 static void
 752 ev_view_scroll_view (EvView *view,
 753                      GtkScrollType scroll,
 754                      gboolean horizontal)
 755 {
 756         if (scroll == GTK_SCROLL_PAGE_BACKWARD) {
 757                 ev_view_set_page (view, ev_view_get_page (view) - 1);
 758         } else if (scroll == GTK_SCROLL_PAGE_FORWARD) {
 759                 ev_view_set_page (view, ev_view_get_page (view) + 1);
 760         } else {
 761                 GtkAdjustment *adjustment;
 762                 double value;
 763
 764                 if (horizontal) {
 765                         adjustment = view->hadjustment;
 766                 } else {
 767                         adjustment = view->vadjustment;
 768                 }
 769
 770                 value = adjustment->value;
 771
 772                 switch (scroll) {
 773                         case GTK_SCROLL_STEP_BACKWARD:
 774                                 value -= adjustment->step_increment;
 775                                 break;
 776                         case GTK_SCROLL_STEP_FORWARD:
 777                                 value += adjustment->step_increment;
 778                                 break;
 779                         default:
 780                                 break;
 781                 }
 782
 783                 value = CLAMP (value, adjustment->lower,
 784                                adjustment->upper - adjustment->page_size);
 785
 786                 gtk_adjustment_set_value (adjustment, value);
 787         }
 788 }
 789
 790 static void
 791 ev_view_set_property (GObject *object,
 792                       guint prop_id,
 793                       const GValue *value,
 794                       GParamSpec *pspec)
 795 {
 796         switch (prop_id)
 797         {
 798                 /* Read only */
 799                 case PROP_STATUS:
 800                 case PROP_FIND_STATUS:
 801                         break;
 802         }
 803 }
 804
 805 static void
 806 ev_view_get_property (GObject *object,
 807                       guint prop_id,
 808                       GValue *value,
 809                       GParamSpec *pspec)
 810 {
 811         EvView *view = EV_VIEW (object);
 812
 813         switch (prop_id)
 814         {
 815                 case PROP_STATUS:
 816                         g_value_set_string (value, view->status);
 817                         break;
 818                 case PROP_FIND_STATUS:
 819                         g_value_set_string (value, view->status);
 820                         break;
 821         }
 822 }
 823
 824 static void
 825 ev_view_class_init (EvViewClass *class)
 826 {
 827         GObjectClass *object_class = G_OBJECT_CLASS (class);
 828         GtkObjectClass *gtk_object_class = GTK_OBJECT_CLASS (class);
 829         GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
 830         GtkBindingSet *binding_set;
 831
 832         object_class->finalize = ev_view_finalize;
 833         object_class->set_property = ev_view_set_property;
 834         object_class->get_property = ev_view_get_property;
 835
 836         widget_class->expose_event = ev_view_expose_event;
 837         widget_class->button_press_event = ev_view_button_press_event;
 838         widget_class->motion_notify_event = ev_view_motion_notify_event;
 839         widget_class->button_release_event = ev_view_button_release_event;
 840         widget_class->size_request = ev_view_size_request;
 841         widget_class->size_allocate = ev_view_size_allocate;
 842         widget_class->realize = ev_view_realize;
 843         widget_class->unrealize = ev_view_unrealize;
 844         gtk_object_class->destroy = ev_view_destroy;
 845
 846         class->set_scroll_adjustments = ev_view_set_scroll_adjustments;
 847         class->scroll_view = ev_view_scroll_view;
 848
 849         widget_class->set_scroll_adjustments_signal =  g_signal_new ("set-scroll-adjustments",
 850                                                                      G_OBJECT_CLASS_TYPE (object_class),
 851                                                                      G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 852                                                                      G_STRUCT_OFFSET (EvViewClass, set_scroll_adjustments),
 853                                                                      NULL, NULL,
 854                                                                      ev_marshal_VOID__OBJECT_OBJECT,
 855                                                                      G_TYPE_NONE, 2,
 856                                                                      GTK_TYPE_ADJUSTMENT,
 857                                                                      GTK_TYPE_ADJUSTMENT);
 858         page_changed_signal = g_signal_new ("page-changed",
 859                                             G_OBJECT_CLASS_TYPE (object_class),
 860                                             G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 861                                             G_STRUCT_OFFSET (EvViewClass, page_changed),
 862                                             NULL, NULL,
 863                                             ev_marshal_VOID__NONE,
 864                                             G_TYPE_NONE, 0);
 865
 866         g_signal_new ("scroll_view",
 867                       G_TYPE_FROM_CLASS (object_class),
 868                       G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 869                       G_STRUCT_OFFSET (EvViewClass, scroll_view),
 870                       NULL, NULL,
 871                       ev_marshal_VOID__ENUM_BOOLEAN,
 872                       G_TYPE_NONE, 2,
 873                       GTK_TYPE_SCROLL_TYPE,
 874                       G_TYPE_BOOLEAN);
 875
 876         g_object_class_install_property (object_class,
 877                                          PROP_STATUS,
 878                                          g_param_spec_string ("status",
 879                                                               "Status Message",
 880                                                               "The status message",
 881                                                               NULL,
 882                                                               G_PARAM_READABLE));
 883
 884         g_object_class_install_property (object_class,
 885                                          PROP_STATUS,
 886                                          g_param_spec_string ("find-status",
 887                                                               "Find Status Message",
 888                                                               "The find status message",
 889                                                               NULL,
 890                                                               G_PARAM_READABLE));
 891
 892         binding_set = gtk_binding_set_by_class (class);
 893
 894         add_scroll_binding (binding_set, GDK_Left,  GTK_SCROLL_STEP_BACKWARD, TRUE);
 895         add_scroll_binding (binding_set, GDK_Right, GTK_SCROLL_STEP_FORWARD,  TRUE);
 896         add_scroll_binding (binding_set, GDK_Up,    GTK_SCROLL_STEP_BACKWARD, FALSE);
 897         add_scroll_binding (binding_set, GDK_Down,  GTK_SCROLL_STEP_FORWARD,  FALSE);
 898
 899         add_scroll_binding (binding_set, GDK_Page_Up,   GTK_SCROLL_PAGE_BACKWARD, FALSE);
 900         add_scroll_binding (binding_set, GDK_Page_Down, GTK_SCROLL_PAGE_FORWARD,  FALSE);
 901 }
 902
 903 static void
 904 ev_view_init (EvView *view)
 905 {
 906         GTK_WIDGET_SET_FLAGS (view, GTK_CAN_FOCUS);
 907
 908         view->scale = 1.0;
 909         view->pressed_button = -1;
 910         view->cursor = EV_VIEW_CURSOR_NORMAL;
 911 }
 912
 913 static void
 914 update_find_status_message (EvView *view)
 915 {
 916         char *message;
 917
 918         if (ev_document_get_page (view->document) == view->find_page) {
 919                 int results;
 920
 921                 results = ev_document_find_get_n_results
 922                                 (EV_DOCUMENT_FIND (view->document));
 923
 924                 message = g_strdup_printf (_("%d found on this page"),
 925                                            results);
 926         } else {
 927                 double percent;
 928
 929                 percent = ev_document_find_get_progress
 930                                 (EV_DOCUMENT_FIND (view->document));
 931
 932                 if (percent >= (1.0 - 1e-10)) {
 933                         message = g_strdup (_("Not found"));
 934                 } else {
 935                         message = g_strdup_printf (_("%3d%% remaining to search"),
 936                                                    (int) ((1.0 - percent) * 100));
 937                 }
 938
 939         }
 940
 941         ev_view_set_find_status (view, message);
 942         g_free (message);
 943 }
 944
 945 static void
 946 set_document_page (EvView *view, int page)
 947 {
 948         if (view->document) {
 949                 int old_page = ev_document_get_page (view->document);
 950                 int old_width, old_height;
 951
 952                 ev_document_get_page_size (view->document,
 953                                            &old_width, &old_height);
 954
 955                 if (old_page != page) {
 956                         ev_view_set_cursor (view, EV_VIEW_CURSOR_WAIT);
 957                         ev_document_set_page (view->document, page);
 958                 }
 959
 960                 if (old_page != ev_document_get_page (view->document)) {
 961                         int width, height;
 962
 963                         g_signal_emit (view, page_changed_signal, 0);
 964
 965                         view->has_selection = FALSE;
 966                         ev_document_get_page_size (view->document,
 967                                                    &width, &height);
 968                         if (width != old_width || height != old_height)
 969                                 gtk_widget_queue_resize (GTK_WIDGET (view));
 970
 971                         gtk_adjustment_set_value (view->vadjustment,
 972                                                   view->vadjustment->lower);
 973                 }
 974
 975                 view->find_page = page;
 976                 view->find_result = 0;
 977                 update_find_status_message (view);
 978         }
 979 }
 980
 981 #define MARGIN 5
 982
 983 static void
 984 ensure_rectangle_is_visible (EvView *view, GdkRectangle *rect)
 985 {
 986         GtkWidget *widget = GTK_WIDGET (view);
 987         GtkAdjustment *adjustment;
 988         int value;
 989
 990         adjustment = view->vadjustment;
 991
 992         if (rect->y < adjustment->value) {
 993                 value = MAX (adjustment->lower, rect->y - MARGIN);
 994                 gtk_adjustment_set_value (view->vadjustment, value);
 995         } else if (rect->y + rect->height >
 996                    adjustment->value + widget->allocation.height) {
 997                 value = MIN (adjustment->upper, rect->y + rect->height -
 998                              widget->allocation.height + MARGIN);
 999                 gtk_adjustment_set_value (view->vadjustment, value);
1000         }
1001
1002         adjustment = view->hadjustment;
1003
1004         if (rect->x < adjustment->value) {
1005                 value = MAX (adjustment->lower, rect->x - MARGIN);
1006                 gtk_adjustment_set_value (view->hadjustment, value);
1007         } else if (rect->x + rect->height >
1008                    adjustment->value + widget->allocation.width) {
1009                 value = MIN (adjustment->upper, rect->x + rect->width -
1010                              widget->allocation.width + MARGIN);
1011                 gtk_adjustment_set_value (view->hadjustment, value);
1012         }
1013 }
1014
1015 static void
1016 jump_to_find_result (EvView *view)
1017 {
1018         GdkRectangle rect;
1019
1020         ev_document_find_get_result (EV_DOCUMENT_FIND (view->document),
1021                                      view->find_result, &rect);
1022         ensure_rectangle_is_visible (view, &rect);
1023 }
1024
1025 static void
1026 jump_to_find_page (EvView *view)
1027 {
1028         int n_pages, i;
1029
1030         n_pages = ev_document_get_n_pages (view->document);
1031
1032         for (i = 0; i <= n_pages; i++) {
1033                 int has_results;
1034                 int page;
1035
1036                 page = i + view->find_page;
1037                 if (page > n_pages) {
1038                         page = page - n_pages;
1039                 }
1040
1041                 has_results = ev_document_find_page_has_results
1042                                 (EV_DOCUMENT_FIND (view->document), page);
1043                 if (has_results == -1) {
1044                         view->find_page = page;
1045                         break;
1046                 } else if (has_results == 1) {
1047                         set_document_page (view, page);
1048                         jump_to_find_result (view);
1049                         break;
1050                 }
1051         }
1052 }
1053
1054 static void
1055 find_changed_cb (EvDocument *document, int page, EvView *view)
1056 {
1057         jump_to_find_page (view);
1058         jump_to_find_result (view);
1059         update_find_status_message (view);
1060
1061         if (ev_document_get_page (document) == page) {
1062                 gtk_widget_queue_draw (GTK_WIDGET (view));
1063         }
1064 }
1065
1066 static void
1067 document_changed_callback (EvDocument *document,
1068                            EvView     *view)
1069 {
1070         gtk_widget_queue_draw (GTK_WIDGET (view));
1071         ev_view_set_cursor (view, EV_VIEW_CURSOR_NORMAL);
1072 }
1073
1074 /*** Public API ***/
1075
1076 GtkWidget*
1077 ev_view_new (void)
1078 {
1079         return g_object_new (EV_TYPE_VIEW, NULL);
1080 }
1081
1082 void
1083 ev_view_set_document (EvView     *view,
1084                       EvDocument *document)
1085 {
1086         g_return_if_fail (EV_IS_VIEW (view));
1087
1088         if (document != view->document) {
1089                 if (view->document) {
1090                         g_signal_handlers_disconnect_by_func (view->document,
1091                                                               find_changed_cb,
1092                                                               view);
1093                         g_object_unref (view->document);
1094                 }
1095
1096                 view->document = document;
1097                 view->find_page = 1;
1098                 view->find_result = 0;
1099
1100                 if (view->document) {
1101                         g_object_ref (view->document);
1102                         if (EV_IS_DOCUMENT_FIND (view->document))
1103                                 g_signal_connect (view->document,
1104                                                   "find_changed",
1105                                                   G_CALLBACK (find_changed_cb),
1106                                                   view);
1107                         g_signal_connect (view->document,
1108                                           "changed",
1109                                           G_CALLBACK (document_changed_callback),
1110                                           view);
1111                 }
1112
1113                 if (GTK_WIDGET_REALIZED (view))
1114                         ev_document_set_target (view->document, view->bin_window);
1115
1116                 gtk_widget_queue_resize (GTK_WIDGET (view));
1117
1118                 g_signal_emit (view, page_changed_signal, 0);
1119         }
1120 }
1121
1122 static void
1123 go_to_link (EvView *view, EvLink *link)
1124 {
1125         EvLinkType type;
1126         const char *uri;
1127         int page;
1128
1129         type = ev_link_get_link_type (link);
1130
1131         switch (type) {
1132                 case EV_LINK_TYPE_TITLE:
1133                         break;
1134                 case EV_LINK_TYPE_PAGE:
1135                         page = ev_link_get_page (link);
1136                         set_document_page (view, page);
1137                         break;
1138                 case EV_LINK_TYPE_EXTERNAL_URI:
1139                         uri = ev_link_get_uri (link);
1140                         gnome_vfs_url_show (uri);
1141                         break;
1142         }
1143 }
1144
1145 void
1146 ev_view_go_to_link (EvView *view, EvLink *link)
1147 {
1148         go_to_link (view, link);
1149 }
1150
1151 void
1152 ev_view_set_page (EvView *view,
1153                   int     page)
1154 {
1155         g_return_if_fail (EV_IS_VIEW (view));
1156
1157         set_document_page (view, page);
1158 }
1159
1160 int
1161 ev_view_get_page (EvView *view)
1162 {
1163         if (view->document)
1164                 return ev_document_get_page (view->document);
1165         else
1166                 return 1;
1167 }
1168
1169 #define ZOOM_IN_FACTOR  1.2
1170 #define ZOOM_OUT_FACTOR (1.0/ZOOM_IN_FACTOR)
1171
1172 #define MIN_SCALE 0.05409
1173 #define MAX_SCALE 18.4884
1174
1175 static void
1176 ev_view_zoom (EvView   *view,
1177               double    factor,
1178               gboolean  relative)
1179 {
1180         double scale;
1181
1182         if (relative)
1183                 scale = view->scale * factor;
1184         else
1185                 scale = factor;
1186
1187         view->scale = CLAMP (scale, MIN_SCALE, MAX_SCALE);
1188
1189         ev_document_set_scale (view->document, view->scale);
1190
1191         gtk_widget_queue_resize (GTK_WIDGET (view));
1192 }
1193
1194 void
1195 ev_view_zoom_in (EvView *view)
1196 {
1197         ev_view_zoom (view, ZOOM_IN_FACTOR, TRUE);
1198 }
1199
1200 void
1201 ev_view_zoom_out (EvView *view)
1202 {
1203         ev_view_zoom (view, ZOOM_OUT_FACTOR, TRUE);
1204 }
1205
1206 void
1207 ev_view_normal_size (EvView *view)
1208 {
1209         ev_view_zoom (view, 1.0, FALSE);
1210 }
1211
1212 void
1213 ev_view_best_fit (EvView *view)
1214 {
1215         double scale;
1216         int width, height;
1217
1218         width = height = 0;
1219         ev_document_get_page_size (view->document, &width, &height);
1220
1221         scale = 1.0;
1222         if (width != 0 && height != 0) {
1223                 double scale_w, scale_h;
1224
1225                 scale_w = (double)GTK_WIDGET (view)->allocation.width * view->scale / width;
1226                 scale_h = (double)GTK_WIDGET (view)->allocation.height * view->scale / height;
1227
1228                 scale = (scale_w < scale_h) ? scale_w : scale_h;
1229         }
1230
1231         ev_view_zoom (view, scale, FALSE);
1232 }
1233
1234 void
1235 ev_view_fit_width (EvView *view)
1236 {
1237         double scale = 1.0;
1238         int width;
1239
1240         width = 0;
1241         ev_document_get_page_size (view->document, &width, NULL);
1242
1243         scale = 1.0;
1244         if (width != 0)
1245                 scale = (double)GTK_WIDGET (view)->allocation.width * view->scale / width;
1246
1247         ev_view_zoom (view, scale, FALSE);
1248 }
1249
1250 const char *
1251 ev_view_get_status (EvView *view)
1252 {
1253         g_return_val_if_fail (EV_IS_VIEW (view), NULL);
1254
1255         return view->status;
1256 }
1257
1258 const char *
1259 ev_view_get_find_status (EvView *view)
1260 {
1261         g_return_val_if_fail (EV_IS_VIEW (view), NULL);
1262
1263         return view->find_status;
1264 }
1265
1266 void
1267 ev_view_find_next (EvView *view)
1268 {
1269         int n_results, n_pages;
1270         EvDocumentFind *find = EV_DOCUMENT_FIND (view->document);
1271
1272         n_results = ev_document_find_get_n_results (find);
1273         n_pages = ev_document_get_n_pages (view->document);
1274
1275         view->find_result++;
1276
1277         if (view->find_result >= n_results) {
1278                 view->find_result = 0;
1279                 view->find_page++;
1280
1281                 if (view->find_page > n_pages) {
1282                         view->find_page = 1;
1283                 }
1284
1285                 jump_to_find_page (view);
1286         } else {
1287                 jump_to_find_result (view);
1288                 gtk_widget_queue_draw (GTK_WIDGET (view));
1289         }
1290 }
1291
1292 void
1293 ev_view_find_previous (EvView *view)
1294 {
1295         int n_results, n_pages;
1296         EvDocumentFind *find = EV_DOCUMENT_FIND (view->document);
1297
1298         n_results = ev_document_find_get_n_results (find);
1299         n_pages = ev_document_get_n_pages (view->document);
1300
1301         view->find_result--;
1302
1303         if (view->find_result < 0) {
1304                 view->find_result = 0;
1305                 view->find_page--;
1306
1307                 if (view->find_page < 1) {
1308                         view->find_page = n_pages;
1309                 }
1310
1311                 jump_to_find_page (view);
1312         } else {
1313                 jump_to_find_result (view);
1314                 gtk_widget_queue_draw (GTK_WIDGET (view));
1315         }
1316 }