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 #include "ev-debug.h"
  33
  34 #define EV_VIEW_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), EV_TYPE_VIEW, EvViewClass))
  35 #define EV_IS_VIEW_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), EV_TYPE_VIEW))
  36 #define EV_VIEW_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), EV_TYPE_VIEW, EvViewClass))
  37
  38 enum {
  39         PROP_0,
  40         PROP_STATUS,
  41         PROP_FIND_STATUS
  42 };
  43
  44 enum {
  45   TARGET_STRING,
  46   TARGET_TEXT,
  47   TARGET_COMPOUND_TEXT,
  48   TARGET_UTF8_STRING,
  49   TARGET_TEXT_BUFFER_CONTENTS
  50 };
  51
  52 static const GtkTargetEntry targets[] = {
  53         { "STRING", 0, TARGET_STRING },
  54         { "TEXT",   0, TARGET_TEXT },
  55         { "COMPOUND_TEXT", 0, TARGET_COMPOUND_TEXT },
  56         { "UTF8_STRING", 0, TARGET_UTF8_STRING },
  57 };
  58
  59 typedef enum {
  60         EV_VIEW_CURSOR_NORMAL,
  61         EV_VIEW_CURSOR_LINK,
  62         EV_VIEW_CURSOR_WAIT
  63 } EvViewCursor;
  64
  65 struct _EvView {
  66         GtkWidget parent_instance;
  67
  68         EvDocument *document;
  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         GdkPoint selection_start;
  81         GdkRectangle selection;
  82         EvViewCursor cursor;
  83
  84         GtkAdjustment *hadjustment;
  85         GtkAdjustment *vadjustment;
  86
  87         int find_page;
  88         int find_result;
  89
  90         double scale;
  91 };
  92
  93 struct _EvViewClass {
  94         GtkWidgetClass parent_class;
  95
  96         void    (*set_scroll_adjustments) (EvView         *view,
  97                                            GtkAdjustment  *hadjustment,
  98                                            GtkAdjustment  *vadjustment);
  99         void    (*scroll_view)            (EvView         *view,
 100                                            GtkScrollType   scroll,
 101                                            gboolean        horizontal);
 102
 103         /* Should this be notify::page? */
 104         void    (*page_changed)           (EvView         *view);
 105 };
 106
 107 static guint page_changed_signal = 0;
 108
 109 static void ev_view_set_scroll_adjustments (EvView         *view,
 110                                             GtkAdjustment  *hadjustment,
 111                                             GtkAdjustment  *vadjustment);
 112
 113 G_DEFINE_TYPE (EvView, ev_view, GTK_TYPE_WIDGET)
 114
 115 /*** Helper functions ***/
 116
 117 static void
 118 view_update_adjustments (EvView *view)
 119 {
 120         int old_x = view->scroll_x;
 121         int old_y = view->scroll_y;
 122
 123         if (view->hadjustment)
 124                 view->scroll_x = view->hadjustment->value;
 125         else
 126                 view->scroll_x = 0;
 127
 128         if (view->vadjustment)
 129                 view->scroll_y = view->vadjustment->value;
 130         else
 131                 view->scroll_y = 0;
 132
 133         if (GTK_WIDGET_REALIZED (view) &&
 134             (view->scroll_x != old_x || view->scroll_y != old_y)) {
 135                 gdk_window_move (view->bin_window, - view->scroll_x, - view->scroll_y);
 136                 gdk_window_process_updates (view->bin_window, TRUE);
 137         }
 138 }
 139
 140 static void
 141 view_set_adjustment_values (EvView         *view,
 142                             GtkOrientation  orientation)
 143 {
 144         GtkWidget *widget = GTK_WIDGET (view);
 145         GtkAdjustment *adjustment;
 146         gboolean value_changed = FALSE;
 147         int requisition;
 148         int allocation;
 149
 150         if (orientation == GTK_ORIENTATION_HORIZONTAL)  {
 151                 requisition = widget->requisition.width;
 152                 allocation = widget->allocation.width;
 153                 adjustment = view->hadjustment;
 154         } else {
 155                 requisition = widget->requisition.height;
 156                 allocation = widget->allocation.height;
 157                 adjustment = view->vadjustment;
 158         }
 159
 160         if (!adjustment)
 161                 return;
 162
 163         adjustment->page_size = allocation;
 164         adjustment->step_increment = allocation * 0.1;
 165         adjustment->page_increment = allocation * 0.9;
 166         adjustment->lower = 0;
 167         adjustment->upper = MAX (allocation, requisition);
 168
 169         if (adjustment->value > adjustment->upper - adjustment->page_size) {
 170                 adjustment->value = adjustment->upper - adjustment->page_size;
 171                 value_changed = TRUE;
 172         }
 173
 174         gtk_adjustment_changed (adjustment);
 175         if (value_changed)
 176                 gtk_adjustment_value_changed (adjustment);
 177 }
 178
 179 /*** Virtual function implementations ***/
 180
 181 static void
 182 ev_view_finalize (GObject *object)
 183 {
 184         EvView *view = EV_VIEW (object);
 185
 186         if (view->document)
 187                 g_object_unref (view->document);
 188
 189         ev_view_set_scroll_adjustments (view, NULL, NULL);
 190
 191         G_OBJECT_CLASS (ev_view_parent_class)->finalize (object);
 192 }
 193
 194 static void
 195 ev_view_destroy (GtkObject *object)
 196 {
 197         EvView *view = EV_VIEW (object);
 198
 199         ev_view_set_scroll_adjustments (view, NULL, NULL);
 200
 201         GTK_OBJECT_CLASS (ev_view_parent_class)->destroy (object);
 202 }
 203
 204 static void
 205 ev_view_size_request (GtkWidget      *widget,
 206                       GtkRequisition *requisition)
 207 {
 208         EvView *view = EV_VIEW (widget);
 209
 210         if (GTK_WIDGET_REALIZED (widget)) {
 211                 if (view->document) {
 212                         ev_document_get_page_size (view->document,
 213                                                    -1,
 214                                                    &requisition->width,
 215                                                    &requisition->height);
 216                 } else {
 217                         requisition->width = 10;
 218                         requisition->height = 10;
 219                 }
 220
 221                 requisition->width += 2;
 222                 requisition->height += 2;
 223         }
 224
 225 }
 226
 227 static void
 228 ev_view_size_allocate (GtkWidget      *widget,
 229                        GtkAllocation  *allocation)
 230 {
 231         EvView *view = EV_VIEW (widget);
 232
 233         GTK_WIDGET_CLASS (ev_view_parent_class)->size_allocate (widget, allocation);
 234
 235         view_set_adjustment_values (view, GTK_ORIENTATION_HORIZONTAL);
 236         view_set_adjustment_values (view, GTK_ORIENTATION_VERTICAL);
 237
 238         if (GTK_WIDGET_REALIZED (widget)) {
 239                 gdk_window_resize (view->bin_window,
 240                                    MAX (widget->allocation.width, widget->requisition.width),
 241                                    MAX (widget->allocation.height, widget->requisition.height));
 242         }
 243 }
 244
 245 static void
 246 ev_view_realize (GtkWidget *widget)
 247 {
 248         EvView *view = EV_VIEW (widget);
 249         GdkWindowAttr attributes;
 250
 251         GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 252
 253         attributes.window_type = GDK_WINDOW_CHILD;
 254         attributes.wclass = GDK_INPUT_OUTPUT;
 255         attributes.visual = gtk_widget_get_visual (widget);
 256         attributes.colormap = gtk_widget_get_colormap (widget);
 257
 258         attributes.x = widget->allocation.x;
 259         attributes.y = widget->allocation.y;
 260         attributes.width = widget->allocation.width;
 261         attributes.height = widget->allocation.height;
 262         attributes.event_mask = 0;
 263
 264         widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
 265                                          &attributes,
 266                                          GDK_WA_X | GDK_WA_Y |
 267                                          GDK_WA_COLORMAP |
 268                                          GDK_WA_VISUAL);
 269         gdk_window_set_user_data (widget->window, widget);
 270         widget->style = gtk_style_attach (widget->style, widget->window);
 271
 272         attributes.x = 0;
 273         attributes.y = 0;
 274         attributes.width = MAX (widget->allocation.width, widget->requisition.width);
 275         attributes.height = MAX (widget->allocation.height, widget->requisition.height);
 276         attributes.event_mask = GDK_EXPOSURE_MASK |
 277                                 GDK_BUTTON_PRESS_MASK |
 278                                 GDK_BUTTON_RELEASE_MASK |
 279                                 GDK_SCROLL_MASK |
 280                                 GDK_KEY_PRESS_MASK |
 281                                 GDK_POINTER_MOTION_MASK;
 282
 283         view->bin_window = gdk_window_new (widget->window,
 284                                            &attributes,
 285                                            GDK_WA_X | GDK_WA_Y |
 286                                            GDK_WA_COLORMAP |
 287                                            GDK_WA_VISUAL);
 288         gdk_window_set_user_data (view->bin_window, widget);
 289         gdk_window_show (view->bin_window);
 290
 291         widget->style = gtk_style_attach (widget->style, view->bin_window);
 292         gdk_window_set_background (view->bin_window, &widget->style->mid[widget->state]);
 293
 294         if (view->document) {
 295                 ev_document_set_target (view->document, view->bin_window);
 296
 297                 /* We can't get page size without a target, so we have to
 298                  * queue a size request at realization. Could be fixed
 299                  * with EvDocument changes to allow setting a GdkScreen
 300                  * without setting a target.
 301                  */
 302                 gtk_widget_queue_resize (widget);
 303         }
 304 }
 305
 306 static void
 307 ev_view_unrealize (GtkWidget *widget)
 308 {
 309         EvView *view = EV_VIEW (widget);
 310
 311         if (view->document)
 312                 ev_document_set_target (view->document, NULL);
 313
 314         gdk_window_set_user_data (view->bin_window, NULL);
 315         gdk_window_destroy (view->bin_window);
 316         view->bin_window = NULL;
 317
 318         GTK_WIDGET_CLASS (ev_view_parent_class)->unrealize (widget);
 319 }
 320
 321 static guint32
 322 ev_gdk_color_to_rgb (const GdkColor *color)
 323 {
 324   guint32 result;
 325   result = (0xff0000 | (color->red & 0xff00));
 326   result <<= 8;
 327   result |= ((color->green & 0xff00) | (color->blue >> 8));
 328   return result;
 329 }
 330
 331 static void
 332 draw_rubberband (GtkWidget *widget, GdkWindow *window,
 333                  const GdkRectangle *rect, guchar alpha)
 334 {
 335         GdkGC *gc;
 336         GdkPixbuf *pixbuf;
 337         GdkColor *fill_color_gdk;
 338         guint fill_color;
 339
 340         fill_color_gdk = gdk_color_copy (&GTK_WIDGET (widget)->style->base[GTK_STATE_SELECTED]);
 341         fill_color = ev_gdk_color_to_rgb (fill_color_gdk) << 8 | alpha;
 342
 343         pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8,
 344                                  rect->width, rect->height);
 345         gdk_pixbuf_fill (pixbuf, fill_color);
 346
 347         gdk_draw_pixbuf (window, NULL, pixbuf,
 348                          0, 0,
 349                          rect->x,rect->y,
 350                          rect->width, rect->height,
 351                          GDK_RGB_DITHER_NONE,
 352                          0, 0);
 353
 354         g_object_unref (pixbuf);
 355
 356         gc = gdk_gc_new (window);
 357         gdk_gc_set_rgb_fg_color (gc, fill_color_gdk);
 358         gdk_draw_rectangle (window, gc, FALSE,
 359                             rect->x, rect->y,
 360                             rect->width - 1,
 361                             rect->height - 1);
 362         g_object_unref (gc);
 363
 364         gdk_color_free (fill_color_gdk);
 365 }
 366
 367 static void
 368 highlight_find_results (EvView *view)
 369 {
 370         EvDocumentFind *find = EV_DOCUMENT_FIND (view->document);
 371         int i, results;
 372
 373         results = ev_document_find_get_n_results (find);
 374
 375         for (i = 0; i < results; i++) {
 376                 GdkRectangle rectangle;
 377                 guchar alpha;
 378
 379                 alpha = (i == view->find_result) ? 0x90 : 0x20;
 380                 ev_document_find_get_result (find, i, &rectangle);
 381                 draw_rubberband (GTK_WIDGET (view), view->bin_window,
 382                                  &rectangle, alpha);
 383         }
 384 }
 385
 386 static void
 387 expose_bin_window (GtkWidget      *widget,
 388                    GdkEventExpose *event)
 389 {
 390         EvView *view = EV_VIEW (widget);
 391         int x_offset, y_offset;
 392
 393         if (view->document == NULL)
 394                 return;
 395
 396         x_offset = MAX (0, (widget->allocation.width -
 397                             widget->requisition.width) / 2);
 398         y_offset = MAX (0, (widget->allocation.height -
 399                             widget->requisition.height) / 2);
 400         gdk_draw_rectangle (view->bin_window,
 401                             widget->style->black_gc,
 402                             FALSE,
 403                             x_offset,
 404                             y_offset,
 405                             widget->requisition.width - 1,
 406                             widget->requisition.height - 1);
 407
 408         ev_document_set_page_offset (view->document,
 409                                      x_offset + 1,
 410                                      y_offset + 1);
 411
 412         LOG ("Render area %d %d %d %d", event->area.x, event->area.y,
 413              event->area.width, event->area.height)
 414
 415         ev_document_render (view->document,
 416                             event->area.x, event->area.y,
 417                             event->area.width, event->area.height);
 418
 419         if (EV_IS_DOCUMENT_FIND (view->document)) {
 420                 highlight_find_results (view);
 421         }
 422
 423         if (view->has_selection) {
 424                 draw_rubberband (widget, view->bin_window,
 425                                  &view->selection, 0x40);
 426         }
 427 }
 428
 429 static gboolean
 430 ev_view_expose_event (GtkWidget      *widget,
 431                       GdkEventExpose *event)
 432 {
 433         EvView *view = EV_VIEW (widget);
 434
 435         if (event->window == view->bin_window)
 436                 expose_bin_window (widget, event);
 437         else
 438                 return GTK_WIDGET_CLASS (ev_view_parent_class)->expose_event (widget, event);
 439
 440         return FALSE;
 441 }
 442
 443 void
 444 ev_view_select_all (EvView *ev_view)
 445 {
 446         GtkWidget *widget = GTK_WIDGET (ev_view);
 447
 448         g_return_if_fail (EV_IS_VIEW (ev_view));
 449
 450         ev_view->has_selection = TRUE;
 451         ev_view->selection.x = ev_view->selection.y = 0;
 452         ev_view->selection.width = widget->requisition.width;
 453         ev_view->selection.height = widget->requisition.height;
 454
 455         gtk_widget_queue_draw (widget);
 456 }
 457
 458 void
 459 ev_view_copy (EvView *ev_view)
 460 {
 461         GtkClipboard *clipboard;
 462         char *text;
 463
 464         text = ev_document_get_text (ev_view->document, &ev_view->selection);
 465         clipboard = gtk_widget_get_clipboard (GTK_WIDGET (ev_view),
 466                                               GDK_SELECTION_CLIPBOARD);
 467         gtk_clipboard_set_text (clipboard, text, -1);
 468         g_free (text);
 469 }
 470
 471 static void
 472 ev_view_primary_get_cb (GtkClipboard     *clipboard,
 473                         GtkSelectionData *selection_data,
 474                         guint             info,
 475                         gpointer          data)
 476 {
 477         EvView *ev_view = EV_VIEW (data);
 478         char *text;
 479
 480         text = ev_document_get_text (ev_view->document, &ev_view->selection);
 481         gtk_selection_data_set_text (selection_data, text, -1);
 482 }
 483
 484 static void
 485 ev_view_primary_clear_cb (GtkClipboard *clipboard,
 486                           gpointer      data)
 487 {
 488         EvView *ev_view = EV_VIEW (data);
 489
 490         ev_view->has_selection = FALSE;
 491 }
 492
 493 static void
 494 ev_view_update_primary_selection (EvView *ev_view)
 495 {
 496         GtkClipboard *clipboard;
 497
 498         clipboard = gtk_widget_get_clipboard (GTK_WIDGET (ev_view),
 499                                               GDK_SELECTION_PRIMARY);
 500
 501         if (ev_view->has_selection) {
 502                 if (!gtk_clipboard_set_with_owner (clipboard,
 503                                                    targets,
 504                                                    G_N_ELEMENTS (targets),
 505                                                    ev_view_primary_get_cb,
 506                                                    ev_view_primary_clear_cb,
 507                                                    G_OBJECT (ev_view)))
 508                         ev_view_primary_clear_cb (clipboard, ev_view);
 509         } else {
 510                 if (gtk_clipboard_get_owner (clipboard) == G_OBJECT (ev_view))
 511                         gtk_clipboard_clear (clipboard);
 512         }
 513 }
 514
 515 static gboolean
 516 ev_view_button_press_event (GtkWidget      *widget,
 517                             GdkEventButton *event)
 518 {
 519         EvView *view = EV_VIEW (widget);
 520
 521         if (!GTK_WIDGET_HAS_FOCUS (widget)) {
 522                 gtk_widget_grab_focus (widget);
 523         }
 524
 525         view->pressed_button = event->button;
 526
 527         switch (event->button) {
 528                 case 1:
 529                         if (view->has_selection) {
 530                                 view->has_selection = FALSE;
 531                                 gtk_widget_queue_draw (widget);
 532                         }
 533
 534                         view->selection_start.x = event->x;
 535                         view->selection_start.y = event->y;
 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
 592 static void
 593 ev_view_set_cursor (EvView *view, EvViewCursor new_cursor)
 594 {
 595         GdkCursor *cursor = NULL;
 596         GdkDisplay *display;
 597         GtkWidget *widget;
 598
 599         if (view->cursor == new_cursor) {
 600                 return;
 601         }
 602
 603         widget = gtk_widget_get_toplevel (GTK_WIDGET (view));
 604         display = gtk_widget_get_display (widget);
 605         view->cursor = new_cursor;
 606
 607         switch (new_cursor) {
 608                 case EV_VIEW_CURSOR_NORMAL:
 609                         gdk_window_set_cursor (widget->window, NULL);
 610                         break;
 611                 case EV_VIEW_CURSOR_LINK:
 612                         cursor = gdk_cursor_new_for_display (display, GDK_HAND2);
 613                         break;
 614                 case EV_VIEW_CURSOR_WAIT:
 615                         cursor = gdk_cursor_new_for_display (display, GDK_WATCH);
 616                         break;
 617         }
 618
 619         if (cursor) {
 620                 gdk_window_set_cursor (widget->window, cursor);
 621                 gdk_cursor_unref (cursor);
 622                 gdk_flush();
 623         }
 624 }
 625
 626 static gboolean
 627 ev_view_motion_notify_event (GtkWidget      *widget,
 628                              GdkEventMotion *event)
 629 {
 630         EvView *view = EV_VIEW (widget);
 631
 632         if (view->pressed_button > 0) {
 633                 view->has_selection = TRUE;
 634                 view->selection.x = MIN (view->selection_start.x, event->x);
 635                 view->selection.y = MIN (view->selection_start.y, event->y);
 636                 view->selection.width = ABS (view->selection_start.x - event->x) + 1;
 637                 view->selection.height = ABS (view->selection_start.y - event->y) + 1;
 638
 639                 gtk_widget_queue_draw (widget);
 640         } else if (view->document) {
 641                 EvLink *link;
 642
 643                 link = ev_document_get_link (view->document, event->x, event->y);
 644                 if (link) {
 645                         char *msg;
 646
 647                         msg = status_message_from_link (link);
 648                         ev_view_set_status (view, msg);
 649                         ev_view_set_cursor (view, EV_VIEW_CURSOR_LINK);
 650                         g_free (msg);
 651
 652                         g_object_unref (link);
 653                 } else {
 654                         ev_view_set_status (view, NULL);
 655                         if (view->cursor == EV_VIEW_CURSOR_LINK) {
 656                                 ev_view_set_cursor (view, EV_VIEW_CURSOR_NORMAL);
 657                         }
 658                 }
 659         }
 660
 661         return TRUE;
 662 }
 663
 664 static gboolean
 665 ev_view_button_release_event (GtkWidget      *widget,
 666                               GdkEventButton *event)
 667 {
 668         EvView *view = EV_VIEW (widget);
 669
 670         view->pressed_button = -1;
 671
 672         if (view->has_selection) {
 673                 ev_view_update_primary_selection (view);
 674         } else if (view->document) {
 675                 EvLink *link;
 676
 677                 link = ev_document_get_link (view->document,
 678                                              event->x,
 679                                              event->y);
 680                 if (link) {
 681                         ev_view_go_to_link (view, link);
 682                         g_object_unref (link);
 683                 }
 684         }
 685
 686         return FALSE;
 687 }
 688
 689 static void
 690 on_adjustment_value_changed (GtkAdjustment  *adjustment,
 691                              EvView *view)
 692 {
 693         view_update_adjustments (view);
 694 }
 695
 696 static void
 697 set_scroll_adjustment (EvView *view,
 698                        GtkOrientation  orientation,
 699                        GtkAdjustment  *adjustment)
 700 {
 701         GtkAdjustment **to_set;
 702
 703         if (orientation == GTK_ORIENTATION_HORIZONTAL)
 704                 to_set = &view->hadjustment;
 705         else
 706                 to_set = &view->vadjustment;
 707
 708         if (*to_set != adjustment) {
 709                 if (*to_set) {
 710                         g_signal_handlers_disconnect_by_func (*to_set,
 711                                                               (gpointer) on_adjustment_value_changed,
 712                                                               view);
 713                         g_object_unref (*to_set);
 714                 }
 715
 716                 *to_set = adjustment;
 717                 view_set_adjustment_values (view, orientation);
 718
 719                 if (*to_set) {
 720                         g_object_ref (*to_set);
 721                         g_signal_connect (*to_set, "value_changed",
 722                                           G_CALLBACK (on_adjustment_value_changed), view);
 723                 }
 724         }
 725 }
 726
 727 static void
 728 ev_view_set_scroll_adjustments (EvView *view,
 729                                 GtkAdjustment  *hadjustment,
 730                                 GtkAdjustment  *vadjustment)
 731 {
 732         set_scroll_adjustment (view, GTK_ORIENTATION_HORIZONTAL, hadjustment);
 733         set_scroll_adjustment (view, GTK_ORIENTATION_VERTICAL, vadjustment);
 734
 735         view_update_adjustments (view);
 736 }
 737
 738 static void
 739 add_scroll_binding (GtkBindingSet  *binding_set,
 740                     guint           keyval,
 741                     GtkScrollType   scroll,
 742                     gboolean        horizontal)
 743 {
 744   guint keypad_keyval = keyval - GDK_Left + GDK_KP_Left;
 745
 746   gtk_binding_entry_add_signal (binding_set, keyval, 0,
 747                                 "scroll_view", 2,
 748                                 GTK_TYPE_SCROLL_TYPE, scroll,
 749                                 G_TYPE_BOOLEAN, horizontal);
 750   gtk_binding_entry_add_signal (binding_set, keypad_keyval, 0,
 751                                 "scroll_view", 2,
 752                                 GTK_TYPE_SCROLL_TYPE, scroll,
 753                                 G_TYPE_BOOLEAN, horizontal);
 754 }
 755
 756 static void
 757 ev_view_scroll_view (EvView *view,
 758                      GtkScrollType scroll,
 759                      gboolean horizontal)
 760 {
 761         if (scroll == GTK_SCROLL_PAGE_BACKWARD) {
 762                 ev_view_set_page (view, ev_view_get_page (view) - 1);
 763         } else if (scroll == GTK_SCROLL_PAGE_FORWARD) {
 764                 ev_view_set_page (view, ev_view_get_page (view) + 1);
 765         } else {
 766                 GtkAdjustment *adjustment;
 767                 double value;
 768
 769                 if (horizontal) {
 770                         adjustment = view->hadjustment;
 771                 } else {
 772                         adjustment = view->vadjustment;
 773                 }
 774
 775                 value = adjustment->value;
 776
 777                 switch (scroll) {
 778                         case GTK_SCROLL_STEP_BACKWARD:
 779                                 value -= adjustment->step_increment;
 780                                 break;
 781                         case GTK_SCROLL_STEP_FORWARD:
 782                                 value += adjustment->step_increment;
 783                                 break;
 784                         default:
 785                                 break;
 786                 }
 787
 788                 value = CLAMP (value, adjustment->lower,
 789                                adjustment->upper - adjustment->page_size);
 790
 791                 gtk_adjustment_set_value (adjustment, value);
 792         }
 793 }
 794
 795 static void
 796 ev_view_set_property (GObject *object,
 797                       guint prop_id,
 798                       const GValue *value,
 799                       GParamSpec *pspec)
 800 {
 801         switch (prop_id)
 802         {
 803                 /* Read only */
 804                 case PROP_STATUS:
 805                 case PROP_FIND_STATUS:
 806                         break;
 807         }
 808 }
 809
 810 static void
 811 ev_view_get_property (GObject *object,
 812                       guint prop_id,
 813                       GValue *value,
 814                       GParamSpec *pspec)
 815 {
 816         EvView *view = EV_VIEW (object);
 817
 818         switch (prop_id)
 819         {
 820                 case PROP_STATUS:
 821                         g_value_set_string (value, view->status);
 822                         break;
 823                 case PROP_FIND_STATUS:
 824                         g_value_set_string (value, view->status);
 825                         break;
 826         }
 827 }
 828
 829 static void
 830 ev_view_class_init (EvViewClass *class)
 831 {
 832         GObjectClass *object_class = G_OBJECT_CLASS (class);
 833         GtkObjectClass *gtk_object_class = GTK_OBJECT_CLASS (class);
 834         GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
 835         GtkBindingSet *binding_set;
 836
 837         object_class->finalize = ev_view_finalize;
 838         object_class->set_property = ev_view_set_property;
 839         object_class->get_property = ev_view_get_property;
 840
 841         widget_class->expose_event = ev_view_expose_event;
 842         widget_class->button_press_event = ev_view_button_press_event;
 843         widget_class->motion_notify_event = ev_view_motion_notify_event;
 844         widget_class->button_release_event = ev_view_button_release_event;
 845         widget_class->size_request = ev_view_size_request;
 846         widget_class->size_allocate = ev_view_size_allocate;
 847         widget_class->realize = ev_view_realize;
 848         widget_class->unrealize = ev_view_unrealize;
 849         gtk_object_class->destroy = ev_view_destroy;
 850
 851         class->set_scroll_adjustments = ev_view_set_scroll_adjustments;
 852         class->scroll_view = ev_view_scroll_view;
 853
 854         widget_class->set_scroll_adjustments_signal =  g_signal_new ("set-scroll-adjustments",
 855                                                                      G_OBJECT_CLASS_TYPE (object_class),
 856                                                                      G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 857                                                                      G_STRUCT_OFFSET (EvViewClass, set_scroll_adjustments),
 858                                                                      NULL, NULL,
 859                                                                      ev_marshal_VOID__OBJECT_OBJECT,
 860                                                                      G_TYPE_NONE, 2,
 861                                                                      GTK_TYPE_ADJUSTMENT,
 862                                                                      GTK_TYPE_ADJUSTMENT);
 863         page_changed_signal = g_signal_new ("page-changed",
 864                                             G_OBJECT_CLASS_TYPE (object_class),
 865                                             G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 866                                             G_STRUCT_OFFSET (EvViewClass, page_changed),
 867                                             NULL, NULL,
 868                                             ev_marshal_VOID__NONE,
 869                                             G_TYPE_NONE, 0);
 870
 871         g_signal_new ("scroll_view",
 872                       G_TYPE_FROM_CLASS (object_class),
 873                       G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 874                       G_STRUCT_OFFSET (EvViewClass, scroll_view),
 875                       NULL, NULL,
 876                       ev_marshal_VOID__ENUM_BOOLEAN,
 877                       G_TYPE_NONE, 2,
 878                       GTK_TYPE_SCROLL_TYPE,
 879                       G_TYPE_BOOLEAN);
 880
 881         g_object_class_install_property (object_class,
 882                                          PROP_STATUS,
 883                                          g_param_spec_string ("status",
 884                                                               "Status Message",
 885                                                               "The status message",
 886                                                               NULL,
 887                                                               G_PARAM_READABLE));
 888
 889         g_object_class_install_property (object_class,
 890                                          PROP_STATUS,
 891                                          g_param_spec_string ("find-status",
 892                                                               "Find Status Message",
 893                                                               "The find status message",
 894                                                               NULL,
 895                                                               G_PARAM_READABLE));
 896
 897         binding_set = gtk_binding_set_by_class (class);
 898
 899         add_scroll_binding (binding_set, GDK_Left,  GTK_SCROLL_STEP_BACKWARD, TRUE);
 900         add_scroll_binding (binding_set, GDK_Right, GTK_SCROLL_STEP_FORWARD,  TRUE);
 901         add_scroll_binding (binding_set, GDK_Up,    GTK_SCROLL_STEP_BACKWARD, FALSE);
 902         add_scroll_binding (binding_set, GDK_Down,  GTK_SCROLL_STEP_FORWARD,  FALSE);
 903
 904         add_scroll_binding (binding_set, GDK_Page_Up,   GTK_SCROLL_PAGE_BACKWARD, FALSE);
 905         add_scroll_binding (binding_set, GDK_Page_Down, GTK_SCROLL_PAGE_FORWARD,  FALSE);
 906 }
 907
 908 static void
 909 ev_view_init (EvView *view)
 910 {
 911         GTK_WIDGET_SET_FLAGS (view, GTK_CAN_FOCUS);
 912
 913         view->scale = 1.0;
 914         view->pressed_button = -1;
 915         view->cursor = EV_VIEW_CURSOR_NORMAL;
 916 }
 917
 918 static void
 919 update_find_status_message (EvView *view)
 920 {
 921         char *message;
 922
 923         if (ev_document_get_page (view->document) == view->find_page) {
 924                 int results;
 925
 926                 results = ev_document_find_get_n_results
 927                                 (EV_DOCUMENT_FIND (view->document));
 928
 929                 message = g_strdup_printf (_("%d found on this page"),
 930                                            results);
 931         } else {
 932                 double percent;
 933
 934                 percent = ev_document_find_get_progress
 935                                 (EV_DOCUMENT_FIND (view->document));
 936
 937                 if (percent >= (1.0 - 1e-10)) {
 938                         message = g_strdup (_("Not found"));
 939                 } else {
 940                         message = g_strdup_printf (_("%3d%% remaining to search"),
 941                                                    (int) ((1.0 - percent) * 100));
 942                 }
 943
 944         }
 945
 946         ev_view_set_find_status (view, message);
 947         g_free (message);
 948 }
 949
 950 static void
 951 set_document_page (EvView *view, int new_page)
 952 {
 953         int page;
 954         int pages;
 955
 956         pages = ev_document_get_n_pages (view->document);
 957         page = CLAMP (new_page, 1, pages);
 958
 959         if (view->document) {
 960                 int old_page = ev_document_get_page (view->document);
 961                 int old_width, old_height;
 962
 963                 ev_document_get_page_size (view->document,
 964                                            -1,
 965                                            &old_width, &old_height);
 966
 967                 if (old_page != page) {
 968                         ev_view_set_cursor (view, EV_VIEW_CURSOR_WAIT);
 969                         ev_document_set_page (view->document, page);
 970                 }
 971
 972                 if (old_page != ev_document_get_page (view->document)) {
 973                         int width, height;
 974
 975                         g_signal_emit (view, page_changed_signal, 0);
 976
 977                         view->has_selection = FALSE;
 978                         ev_document_get_page_size (view->document,
 979                                                    -1,
 980                                                    &width, &height);
 981                         if (width != old_width || height != old_height)
 982                                 gtk_widget_queue_resize (GTK_WIDGET (view));
 983
 984                         gtk_adjustment_set_value (view->vadjustment,
 985                                                   view->vadjustment->lower);
 986                 }
 987
 988                 view->find_page = page;
 989                 view->find_result = 0;
 990
 991                 if (EV_IS_DOCUMENT_FIND (view->document)) {
 992                         update_find_status_message (view);
 993                 }
 994         }
 995 }
 996
 997 #define MARGIN 5
 998
 999 static void
1000 ensure_rectangle_is_visible (EvView *view, GdkRectangle *rect)
1001 {
1002         GtkWidget *widget = GTK_WIDGET (view);
1003         GtkAdjustment *adjustment;
1004         int value;
1005
1006         adjustment = view->vadjustment;
1007
1008         if (rect->y < adjustment->value) {
1009                 value = MAX (adjustment->lower, rect->y - MARGIN);
1010                 gtk_adjustment_set_value (view->vadjustment, value);
1011         } else if (rect->y + rect->height >
1012                    adjustment->value + widget->allocation.height) {
1013                 value = MIN (adjustment->upper, rect->y + rect->height -
1014                              widget->allocation.height + MARGIN);
1015                 gtk_adjustment_set_value (view->vadjustment, value);
1016         }
1017
1018         adjustment = view->hadjustment;
1019
1020         if (rect->x < adjustment->value) {
1021                 value = MAX (adjustment->lower, rect->x - MARGIN);
1022                 gtk_adjustment_set_value (view->hadjustment, value);
1023         } else if (rect->x + rect->height >
1024                    adjustment->value + widget->allocation.width) {
1025                 value = MIN (adjustment->upper, rect->x + rect->width -
1026                              widget->allocation.width + MARGIN);
1027                 gtk_adjustment_set_value (view->hadjustment, value);
1028         }
1029 }
1030
1031 static void
1032 jump_to_find_result (EvView *view)
1033 {
1034         EvDocumentFind *find = EV_DOCUMENT_FIND (view->document);
1035         GdkRectangle rect;
1036         int n_results;
1037
1038         n_results = ev_document_find_get_n_results (find);
1039
1040         if (n_results > view->find_result) {
1041                 ev_document_find_get_result
1042                         (find, view->find_result, &rect);
1043                 ensure_rectangle_is_visible (view, &rect);
1044         }
1045 }
1046
1047 static void
1048 jump_to_find_page (EvView *view)
1049 {
1050         int n_pages, i;
1051
1052         n_pages = ev_document_get_n_pages (view->document);
1053
1054         for (i = 0; i <= n_pages; i++) {
1055                 int has_results;
1056                 int page;
1057
1058                 page = i + view->find_page;
1059                 if (page > n_pages) {
1060                         page = page - n_pages;
1061                 }
1062
1063                 has_results = ev_document_find_page_has_results
1064                                 (EV_DOCUMENT_FIND (view->document), page);
1065                 if (has_results == -1) {
1066                         view->find_page = page;
1067                         break;
1068                 } else if (has_results == 1) {
1069                         set_document_page (view, page);
1070                         jump_to_find_result (view);
1071                         break;
1072                 }
1073         }
1074 }
1075
1076 static void
1077 find_changed_cb (EvDocument *document, int page, EvView *view)
1078 {
1079         jump_to_find_page (view);
1080         jump_to_find_result (view);
1081         update_find_status_message (view);
1082
1083         if (ev_document_get_page (document) == page) {
1084                 gtk_widget_queue_draw (GTK_WIDGET (view));
1085         }
1086 }
1087
1088 static void
1089 document_changed_callback (EvDocument *document,
1090                            EvView     *view)
1091 {
1092         gtk_widget_queue_draw (GTK_WIDGET (view));
1093         ev_view_set_cursor (view, EV_VIEW_CURSOR_NORMAL);
1094 }
1095
1096 /*** Public API ***/
1097
1098 GtkWidget*
1099 ev_view_new (void)
1100 {
1101         return g_object_new (EV_TYPE_VIEW, NULL);
1102 }
1103
1104 void
1105 ev_view_set_document (EvView     *view,
1106                       EvDocument *document)
1107 {
1108         g_return_if_fail (EV_IS_VIEW (view));
1109
1110         if (document != view->document) {
1111                 if (view->document) {
1112                         g_signal_handlers_disconnect_by_func
1113                                 (view->document, find_changed_cb, view);
1114                         g_object_unref (view->document);
1115                 }
1116
1117                 view->document = document;
1118                 view->find_page = 1;
1119                 view->find_result = 0;
1120
1121                 if (view->document) {
1122                         g_object_ref (view->document);
1123                         if (EV_IS_DOCUMENT_FIND (view->document)) {
1124                                 g_signal_connect (view->document,
1125                                                   "find_changed",
1126                                                   G_CALLBACK (find_changed_cb),
1127                                                   view);
1128                         }
1129                         g_signal_connect (view->document,
1130                                           "changed",
1131                                           G_CALLBACK (document_changed_callback),
1132                                           view);
1133                 }
1134
1135                 if (GTK_WIDGET_REALIZED (view))
1136                         ev_document_set_target (view->document, view->bin_window);
1137
1138                 gtk_widget_queue_resize (GTK_WIDGET (view));
1139
1140                 g_signal_emit (view, page_changed_signal, 0);
1141         }
1142 }
1143
1144 static void
1145 go_to_link (EvView *view, EvLink *link)
1146 {
1147         EvLinkType type;
1148         const char *uri;
1149         int page;
1150
1151         type = ev_link_get_link_type (link);
1152
1153         switch (type) {
1154                 case EV_LINK_TYPE_TITLE:
1155                         break;
1156                 case EV_LINK_TYPE_PAGE:
1157                         page = ev_link_get_page (link);
1158                         set_document_page (view, page);
1159                         break;
1160                 case EV_LINK_TYPE_EXTERNAL_URI:
1161                         uri = ev_link_get_uri (link);
1162                         gnome_vfs_url_show (uri);
1163                         break;
1164         }
1165 }
1166
1167 void
1168 ev_view_go_to_link (EvView *view, EvLink *link)
1169 {
1170         go_to_link (view, link);
1171 }
1172
1173 void
1174 ev_view_set_page (EvView *view,
1175                   int     page)
1176 {
1177         g_return_if_fail (EV_IS_VIEW (view));
1178
1179         set_document_page (view, page);
1180 }
1181
1182 int
1183 ev_view_get_page (EvView *view)
1184 {
1185         if (view->document)
1186                 return ev_document_get_page (view->document);
1187         else
1188                 return 1;
1189 }
1190
1191 #define ZOOM_IN_FACTOR  1.2
1192 #define ZOOM_OUT_FACTOR (1.0/ZOOM_IN_FACTOR)
1193
1194 #define MIN_SCALE 0.05409
1195 #define MAX_SCALE 18.4884
1196
1197 static void
1198 ev_view_zoom (EvView   *view,
1199               double    factor,
1200               gboolean  relative)
1201 {
1202         double scale;
1203
1204         if (relative)
1205                 scale = view->scale * factor;
1206         else
1207                 scale = factor;
1208
1209         view->scale = CLAMP (scale, MIN_SCALE, MAX_SCALE);
1210
1211         ev_document_set_scale (view->document, view->scale);
1212
1213         gtk_widget_queue_resize (GTK_WIDGET (view));
1214 }
1215
1216 void
1217 ev_view_zoom_in (EvView *view)
1218 {
1219         ev_view_zoom (view, ZOOM_IN_FACTOR, TRUE);
1220 }
1221
1222 void
1223 ev_view_zoom_out (EvView *view)
1224 {
1225         ev_view_zoom (view, ZOOM_OUT_FACTOR, TRUE);
1226 }
1227
1228 void
1229 ev_view_normal_size (EvView *view)
1230 {
1231         ev_view_zoom (view, 1.0, FALSE);
1232 }
1233
1234 void
1235 ev_view_best_fit (EvView *view)
1236 {
1237         double scale;
1238         int width, height;
1239
1240         width = height = 0;
1241         ev_document_get_page_size (view->document, -1, &width, &height);
1242
1243         scale = 1.0;
1244         if (width != 0 && height != 0) {
1245                 double scale_w, scale_h;
1246
1247                 scale_w = (double)GTK_WIDGET (view)->allocation.width * view->scale / width;
1248                 scale_h = (double)GTK_WIDGET (view)->allocation.height * view->scale / height;
1249
1250                 scale = (scale_w < scale_h) ? scale_w : scale_h;
1251         }
1252
1253         ev_view_zoom (view, scale, FALSE);
1254 }
1255
1256 void
1257 ev_view_fit_width (EvView *view)
1258 {
1259         double scale = 1.0;
1260         int width;
1261
1262         width = 0;
1263         ev_document_get_page_size (view->document, -1, &width, NULL);
1264
1265         scale = 1.0;
1266         if (width != 0)
1267                 scale = (double)GTK_WIDGET (view)->allocation.width * view->scale / width;
1268
1269         ev_view_zoom (view, scale, FALSE);
1270 }
1271
1272 const char *
1273 ev_view_get_status (EvView *view)
1274 {
1275         g_return_val_if_fail (EV_IS_VIEW (view), NULL);
1276
1277         return view->status;
1278 }
1279
1280 const char *
1281 ev_view_get_find_status (EvView *view)
1282 {
1283         g_return_val_if_fail (EV_IS_VIEW (view), NULL);
1284
1285         return view->find_status;
1286 }
1287
1288 void
1289 ev_view_find_next (EvView *view)
1290 {
1291         int n_results, n_pages;
1292         EvDocumentFind *find = EV_DOCUMENT_FIND (view->document);
1293
1294         n_results = ev_document_find_get_n_results (find);
1295         n_pages = ev_document_get_n_pages (view->document);
1296
1297         view->find_result++;
1298
1299         if (view->find_result >= n_results) {
1300                 view->find_result = 0;
1301                 view->find_page++;
1302
1303                 if (view->find_page > n_pages) {
1304                         view->find_page = 1;
1305                 }
1306
1307                 jump_to_find_page (view);
1308         } else {
1309                 jump_to_find_result (view);
1310                 gtk_widget_queue_draw (GTK_WIDGET (view));
1311         }
1312 }
1313
1314 void
1315 ev_view_find_previous (EvView *view)
1316 {
1317         int n_results, n_pages;
1318         EvDocumentFind *find = EV_DOCUMENT_FIND (view->document);
1319
1320         n_results = ev_document_find_get_n_results (find);
1321         n_pages = ev_document_get_n_pages (view->document);
1322
1323         view->find_result--;
1324
1325         if (view->find_result < 0) {
1326                 view->find_result = 0;
1327                 view->find_page--;
1328
1329                 if (view->find_page < 1) {
1330                         view->find_page = n_pages;
1331                 }
1332
1333                 jump_to_find_page (view);
1334         } else {
1335                 jump_to_find_result (view);
1336                 gtk_widget_queue_draw (GTK_WIDGET (view));
1337         }
1338 }