shell/ev-view.c

   1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8; c-indent-level: 8 -*- */
   2 /* this file is part of evince, a gnome document viewer
   3  *
   4  *  Copyright (C) 2004 Red Hat, Inc
   5  *
   6  * Evince is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * Evince is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include <gtk/gtkalignment.h>
  22 #include <glib/gi18n.h>
  23 #include <gtk/gtkbindings.h>
  24 #include <gtk/gtkselection.h>
  25 #include <gtk/gtkclipboard.h>
  26 #include <gdk/gdkkeysyms.h>
  27 #include <libgnomevfs/gnome-vfs-utils.h>
  28
  29 #include "ev-marshal.h"
  30 #include "ev-view.h"
  31 #include "ev-document-find.h"
  32
  33 #define EV_VIEW_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), EV_TYPE_VIEW, EvViewClass))
  34 #define EV_IS_VIEW_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), EV_TYPE_VIEW))
  35 #define EV_VIEW_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), EV_TYPE_VIEW, EvViewClass))
  36
  37 enum {
  38         PROP_0,
  39         PROP_STATUS,
  40         PROP_FIND_STATUS
  41 };
  42
  43 enum {
  44   TARGET_STRING,
  45   TARGET_TEXT,
  46   TARGET_COMPOUND_TEXT,
  47   TARGET_UTF8_STRING,
  48   TARGET_TEXT_BUFFER_CONTENTS
  49 };
  50
  51 static const GtkTargetEntry targets[] = {
  52         { "STRING", 0, TARGET_STRING },
  53         { "TEXT",   0, TARGET_TEXT },
  54         { "COMPOUND_TEXT", 0, TARGET_COMPOUND_TEXT },
  55         { "UTF8_STRING", 0, TARGET_UTF8_STRING },
  56 };
  57
  58 typedef enum {
  59         EV_VIEW_CURSOR_NORMAL,
  60         EV_VIEW_CURSOR_LINK,
  61         EV_VIEW_CURSOR_WAIT
  62 } EvViewCursor;
  63
  64 struct _EvView {
  65         GtkWidget parent_instance;
  66
  67         EvDocument *document;
  68         EvHistory  *history;
  69
  70         GdkWindow *bin_window;
  71
  72         char *status;
  73         char *find_status;
  74
  75         int scroll_x;
  76         int scroll_y;
  77
  78         gboolean pressed_button;
  79         gboolean has_selection;
  80         GdkPoint selection_start;
  81         GdkRectangle selection;
  82         EvViewCursor cursor;
  83
  84         GtkAdjustment *hadjustment;
  85         GtkAdjustment *vadjustment;
  86
  87         GArray *find_results;
  88         int results_on_this_page;
  89         int next_page_with_result;
  90         double find_percent_complete;
  91
  92         double scale;
  93 };
  94
  95 struct _EvViewClass {
  96         GtkWidgetClass parent_class;
  97
  98         void    (*set_scroll_adjustments) (EvView         *view,
  99                                            GtkAdjustment  *hadjustment,
 100                                            GtkAdjustment  *vadjustment);
 101         void    (*scroll_view)            (EvView         *view,
 102                                            GtkScrollType   scroll,
 103                                            gboolean        horizontal);
 104
 105         /* Should this be notify::page? */
 106         void    (*page_changed)           (EvView         *view);
 107 };
 108
 109 static guint page_changed_signal = 0;
 110
 111 static void ev_view_set_scroll_adjustments (EvView         *view,
 112                                             GtkAdjustment  *hadjustment,
 113                                             GtkAdjustment  *vadjustment);
 114
 115 G_DEFINE_TYPE (EvView, ev_view, GTK_TYPE_WIDGET)
 116
 117 /*** Helper functions ***/
 118
 119 static void
 120 view_update_adjustments (EvView *view)
 121 {
 122         int old_x = view->scroll_x;
 123         int old_y = view->scroll_y;
 124
 125         if (view->hadjustment)
 126                 view->scroll_x = view->hadjustment->value;
 127         else
 128                 view->scroll_x = 0;
 129
 130         if (view->vadjustment)
 131                 view->scroll_y = view->vadjustment->value;
 132         else
 133                 view->scroll_y = 0;
 134
 135         if (GTK_WIDGET_REALIZED (view) &&
 136             (view->scroll_x != old_x || view->scroll_y != old_y)) {
 137                 gdk_window_move (view->bin_window, - view->scroll_x, - view->scroll_y);
 138                 gdk_window_process_updates (view->bin_window, TRUE);
 139         }
 140 }
 141
 142 static void
 143 view_set_adjustment_values (EvView         *view,
 144                             GtkOrientation  orientation)
 145 {
 146         GtkWidget *widget = GTK_WIDGET (view);
 147         GtkAdjustment *adjustment;
 148         gboolean value_changed = FALSE;
 149         int requisition;
 150         int allocation;
 151
 152         if (orientation == GTK_ORIENTATION_HORIZONTAL)  {
 153                 requisition = widget->requisition.width;
 154                 allocation = widget->allocation.width;
 155                 adjustment = view->hadjustment;
 156         } else {
 157                 requisition = widget->requisition.height;
 158                 allocation = widget->allocation.height;
 159                 adjustment = view->vadjustment;
 160         }
 161
 162         if (!adjustment)
 163                 return;
 164
 165         adjustment->page_size = allocation;
 166         adjustment->step_increment = allocation * 0.1;
 167         adjustment->page_increment = allocation * 0.9;
 168         adjustment->lower = 0;
 169         adjustment->upper = MAX (allocation, requisition);
 170
 171         if (adjustment->value > adjustment->upper - adjustment->page_size) {
 172                 adjustment->value = adjustment->upper - adjustment->page_size;
 173                 value_changed = TRUE;
 174         }
 175
 176         gtk_adjustment_changed (adjustment);
 177         if (value_changed)
 178                 gtk_adjustment_value_changed (adjustment);
 179 }
 180
 181 /*** Virtual function implementations ***/
 182
 183 static void
 184 ev_view_finalize (GObject *object)
 185 {
 186         EvView *view = EV_VIEW (object);
 187
 188         if (view->document)
 189                 g_object_unref (view->document);
 190
 191         if (view->history)
 192                 g_object_unref (view->history);
 193
 194         ev_view_set_scroll_adjustments (view, NULL, NULL);
 195
 196         g_array_free (view->find_results, TRUE);
 197         view->find_results = NULL;
 198
 199         G_OBJECT_CLASS (ev_view_parent_class)->finalize (object);
 200 }
 201
 202 static void
 203 ev_view_destroy (GtkObject *object)
 204 {
 205         EvView *view = EV_VIEW (object);
 206
 207         ev_view_set_scroll_adjustments (view, NULL, NULL);
 208
 209         GTK_OBJECT_CLASS (ev_view_parent_class)->destroy (object);
 210 }
 211
 212 static void
 213 ev_view_size_request (GtkWidget      *widget,
 214                       GtkRequisition *requisition)
 215 {
 216         EvView *view = EV_VIEW (widget);
 217
 218         if (GTK_WIDGET_REALIZED (widget)) {
 219                 if (view->document) {
 220                         ev_document_get_page_size (view->document,
 221                                                    &requisition->width,
 222                                                    &requisition->height);
 223                 } else {
 224                         requisition->width = 10;
 225                         requisition->height = 10;
 226                 }
 227
 228                 requisition->width += 2;
 229                 requisition->height += 2;
 230         }
 231
 232 }
 233
 234 static void
 235 ev_view_size_allocate (GtkWidget      *widget,
 236                        GtkAllocation  *allocation)
 237 {
 238         EvView *view = EV_VIEW (widget);
 239
 240         GTK_WIDGET_CLASS (ev_view_parent_class)->size_allocate (widget, allocation);
 241
 242         view_set_adjustment_values (view, GTK_ORIENTATION_HORIZONTAL);
 243         view_set_adjustment_values (view, GTK_ORIENTATION_VERTICAL);
 244
 245         if (GTK_WIDGET_REALIZED (widget)) {
 246                 gdk_window_resize (view->bin_window,
 247                                    MAX (widget->allocation.width, widget->requisition.width),
 248                                    MAX (widget->allocation.height, widget->requisition.height));
 249         }
 250 }
 251
 252 static void
 253 ev_view_realize (GtkWidget *widget)
 254 {
 255         EvView *view = EV_VIEW (widget);
 256         GdkWindowAttr attributes;
 257
 258         GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 259
 260         attributes.window_type = GDK_WINDOW_CHILD;
 261         attributes.wclass = GDK_INPUT_OUTPUT;
 262         attributes.visual = gtk_widget_get_visual (widget);
 263         attributes.colormap = gtk_widget_get_colormap (widget);
 264
 265         attributes.x = widget->allocation.x;
 266         attributes.y = widget->allocation.y;
 267         attributes.width = widget->allocation.width;
 268         attributes.height = widget->allocation.height;
 269         attributes.event_mask = 0;
 270
 271         widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
 272                                          &attributes,
 273                                          GDK_WA_X | GDK_WA_Y |
 274                                          GDK_WA_COLORMAP |
 275                                          GDK_WA_VISUAL);
 276         gdk_window_set_user_data (widget->window, widget);
 277         widget->style = gtk_style_attach (widget->style, widget->window);
 278
 279         attributes.x = 0;
 280         attributes.y = 0;
 281         attributes.width = MAX (widget->allocation.width, widget->requisition.width);
 282         attributes.height = MAX (widget->allocation.height, widget->requisition.height);
 283         attributes.event_mask = GDK_EXPOSURE_MASK |
 284                                 GDK_BUTTON_PRESS_MASK |
 285                                 GDK_BUTTON_RELEASE_MASK |
 286                                 GDK_SCROLL_MASK |
 287                                 GDK_KEY_PRESS_MASK |
 288                                 GDK_POINTER_MOTION_MASK;
 289
 290         view->bin_window = gdk_window_new (widget->window,
 291                                            &attributes,
 292                                            GDK_WA_X | GDK_WA_Y |
 293                                            GDK_WA_COLORMAP |
 294                                            GDK_WA_VISUAL);
 295         gdk_window_set_user_data (view->bin_window, widget);
 296         gdk_window_show (view->bin_window);
 297
 298         widget->style = gtk_style_attach (widget->style, view->bin_window);
 299         gdk_window_set_background (view->bin_window, &widget->style->mid[widget->state]);
 300
 301         if (view->document) {
 302                 ev_document_set_target (view->document, view->bin_window);
 303
 304                 /* We can't get page size without a target, so we have to
 305                  * queue a size request at realization. Could be fixed
 306                  * with EvDocument changes to allow setting a GdkScreen
 307                  * without setting a target.
 308                  */
 309                 gtk_widget_queue_resize (widget);
 310         }
 311 }
 312
 313 static void
 314 ev_view_unrealize (GtkWidget *widget)
 315 {
 316         EvView *view = EV_VIEW (widget);
 317
 318         if (view->document)
 319                 ev_document_set_target (view->document, NULL);
 320
 321         gdk_window_set_user_data (view->bin_window, NULL);
 322         gdk_window_destroy (view->bin_window);
 323         view->bin_window = NULL;
 324
 325         GTK_WIDGET_CLASS (ev_view_parent_class)->unrealize (widget);
 326 }
 327
 328 static guint32
 329 ev_gdk_color_to_rgb (const GdkColor *color)
 330 {
 331   guint32 result;
 332   result = (0xff0000 | (color->red & 0xff00));
 333   result <<= 8;
 334   result |= ((color->green & 0xff00) | (color->blue >> 8));
 335   return result;
 336 }
 337
 338 static void
 339 draw_rubberband (GtkWidget *widget, GdkWindow *window, const GdkRectangle *rect)
 340 {
 341         GdkGC *gc;
 342         GdkPixbuf *pixbuf;
 343         GdkColor *fill_color_gdk;
 344         guint fill_color;
 345
 346         fill_color_gdk = gdk_color_copy (&GTK_WIDGET (widget)->style->base[GTK_STATE_SELECTED]);
 347         fill_color = ev_gdk_color_to_rgb (fill_color_gdk) << 8 | 0x40;
 348
 349         pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8,
 350                                  rect->width, rect->height);
 351         gdk_pixbuf_fill (pixbuf, fill_color);
 352
 353         gdk_draw_pixbuf (window, NULL, pixbuf,
 354                          0, 0,
 355                          rect->x,rect->y,
 356                          rect->width, rect->height,
 357                          GDK_RGB_DITHER_NONE,
 358                          0, 0);
 359
 360         g_object_unref (pixbuf);
 361
 362         gc = gdk_gc_new (window);
 363         gdk_gc_set_rgb_fg_color (gc, fill_color_gdk);
 364         gdk_draw_rectangle (window, gc, FALSE,
 365                             rect->x, rect->y,
 366                             rect->width - 1,
 367                             rect->height - 1);
 368         g_object_unref (gc);
 369
 370         gdk_color_free (fill_color_gdk);
 371 }
 372
 373 static void
 374 expose_bin_window (GtkWidget      *widget,
 375                    GdkEventExpose *event)
 376 {
 377         EvView *view = EV_VIEW (widget);
 378         int i, current_page;
 379         int x_offset, y_offset;
 380         const EvFindResult *results;
 381
 382         if (view->document == NULL)
 383                 return;
 384
 385         x_offset = MAX (0, (widget->allocation.width -
 386                             widget->requisition.width) / 2);
 387         y_offset = MAX (0, (widget->allocation.height -
 388                             widget->requisition.height) / 2);
 389         gdk_draw_rectangle (view->bin_window,
 390                             widget->style->black_gc,
 391                             FALSE,
 392                             x_offset,
 393                             y_offset,
 394                             widget->requisition.width - 1,
 395                             widget->requisition.height - 1);
 396
 397         ev_document_set_page_offset (view->document,
 398                                      x_offset + 1,
 399                                      y_offset + 1);
 400
 401         ev_document_render (view->document,
 402                             event->area.x, event->area.y,
 403                             event->area.width, event->area.height);
 404
 405         results = (EvFindResult*) view->find_results->data;
 406         current_page = ev_document_get_page (view->document);
 407         i = 0;
 408         while (i < view->find_results->len) {
 409 #if 0
 410                 g_printerr ("highlighting result %d page %d at %d,%d %dx%d\n",
 411                             i, results[i].page_num,
 412                             results[i].highlight_area.x,
 413                             results[i].highlight_area.y,
 414                             results[i].highlight_area.width,
 415                             results[i].highlight_area.height);
 416 #endif
 417                 if (results[i].page_num == current_page) {
 418                         GdkRectangle highlight_area_fixed;
 419                         highlight_area_fixed.x = results[i].highlight_area.x + x_offset + 1;
 420                         highlight_area_fixed.y = results[i].highlight_area.y + y_offset + 1;
 421                         highlight_area_fixed.width = results[i].highlight_area.width;
 422                         highlight_area_fixed.height = results[i].highlight_area.height;
 423
 424                         draw_rubberband (widget, view->bin_window,
 425                                          &highlight_area_fixed);
 426                 }
 427                 ++i;
 428         }
 429
 430         if (view->has_selection) {
 431                 draw_rubberband (widget, view->bin_window, &view->selection);
 432         }
 433 }
 434
 435 static gboolean
 436 ev_view_expose_event (GtkWidget      *widget,
 437                       GdkEventExpose *event)
 438 {
 439         EvView *view = EV_VIEW (widget);
 440
 441         if (event->window == view->bin_window)
 442                 expose_bin_window (widget, event);
 443         else
 444                 return GTK_WIDGET_CLASS (ev_view_parent_class)->expose_event (widget, event);
 445
 446         return FALSE;
 447 }
 448
 449 void
 450 ev_view_select_all (EvView *ev_view)
 451 {
 452         GtkWidget *widget = GTK_WIDGET (ev_view);
 453
 454         g_return_if_fail (EV_IS_VIEW (ev_view));
 455
 456         ev_view->has_selection = TRUE;
 457         ev_view->selection.x = ev_view->selection.y = 0;
 458         ev_view->selection.width = widget->requisition.width;
 459         ev_view->selection.height = widget->requisition.height;
 460
 461         gtk_widget_queue_draw (widget);
 462 }
 463
 464 void
 465 ev_view_copy (EvView *ev_view)
 466 {
 467         GtkClipboard *clipboard;
 468         char *text;
 469
 470         text = ev_document_get_text (ev_view->document, &ev_view->selection);
 471         clipboard = gtk_widget_get_clipboard (GTK_WIDGET (ev_view),
 472                                               GDK_SELECTION_CLIPBOARD);
 473         gtk_clipboard_set_text (clipboard, text, -1);
 474         g_free (text);
 475 }
 476
 477 static void
 478 ev_view_primary_get_cb (GtkClipboard     *clipboard,
 479                         GtkSelectionData *selection_data,
 480                         guint             info,
 481                         gpointer          data)
 482 {
 483         EvView *ev_view = EV_VIEW (data);
 484         char *text;
 485
 486         text = ev_document_get_text (ev_view->document, &ev_view->selection);
 487         gtk_selection_data_set_text (selection_data, text, -1);
 488 }
 489
 490 static void
 491 ev_view_primary_clear_cb (GtkClipboard *clipboard,
 492                           gpointer      data)
 493 {
 494         EvView *ev_view = EV_VIEW (data);
 495
 496         ev_view->has_selection = FALSE;
 497 }
 498
 499 static void
 500 ev_view_update_primary_selection (EvView *ev_view)
 501 {
 502         GtkClipboard *clipboard;
 503
 504         clipboard = gtk_widget_get_clipboard (GTK_WIDGET (ev_view),
 505                                               GDK_SELECTION_PRIMARY);
 506
 507         if (ev_view->has_selection) {
 508                 if (!gtk_clipboard_set_with_owner (clipboard,
 509                                                    targets,
 510                                                    G_N_ELEMENTS (targets),
 511                                                    ev_view_primary_get_cb,
 512                                                    ev_view_primary_clear_cb,
 513                                                    G_OBJECT (ev_view)))
 514                         ev_view_primary_clear_cb (clipboard, ev_view);
 515         } else {
 516                 if (gtk_clipboard_get_owner (clipboard) == G_OBJECT (ev_view))
 517                         gtk_clipboard_clear (clipboard);
 518         }
 519 }
 520
 521 static gboolean
 522 ev_view_button_press_event (GtkWidget      *widget,
 523                             GdkEventButton *event)
 524 {
 525         EvView *view = EV_VIEW (widget);
 526
 527         if (!GTK_WIDGET_HAS_FOCUS (widget)) {
 528                 gtk_widget_grab_focus (widget);
 529         }
 530
 531         view->pressed_button = event->button;
 532
 533         switch (event->button) {
 534                 case 1:
 535                         if (view->has_selection) {
 536                                 view->has_selection = FALSE;
 537                                 gtk_widget_queue_draw (widget);
 538                         }
 539
 540                         view->selection_start.x = event->x;
 541                         view->selection_start.y = event->y;
 542                         break;
 543         }
 544
 545         return TRUE;
 546 }
 547
 548 static char *
 549 status_message_from_link (EvLink *link)
 550 {
 551         EvLinkType type;
 552         char *msg;
 553         int page;
 554
 555         type = ev_link_get_link_type (link);
 556
 557         switch (type) {
 558                 case EV_LINK_TYPE_TITLE:
 559                         msg = g_strdup (ev_link_get_title (link));
 560                         break;
 561                 case EV_LINK_TYPE_PAGE:
 562                         page = ev_link_get_page (link);
 563                         msg = g_strdup_printf (_("Go to page %d"), page);
 564                         break;
 565                 case EV_LINK_TYPE_EXTERNAL_URI:
 566                         msg = g_strdup (ev_link_get_uri (link));
 567                         break;
 568                 default:
 569                         msg = NULL;
 570         }
 571
 572         return msg;
 573 }
 574
 575 static void
 576 ev_view_set_status (EvView *view, const char *message)
 577 {
 578         g_return_if_fail (EV_IS_VIEW (view));
 579
 580         if (message != view->status) {
 581                 g_free (view->status);
 582                 view->status = g_strdup (message);
 583                 g_object_notify (G_OBJECT (view), "status");
 584         }
 585 }
 586
 587 static void
 588 ev_view_set_find_status (EvView *view, const char *message)
 589 {
 590         g_return_if_fail (EV_IS_VIEW (view));
 591
 592         g_free (view->find_status);
 593         view->find_status = g_strdup (message);
 594         g_object_notify (G_OBJECT (view), "find-status");
 595 }
 596
 597 static void
 598 ev_view_set_cursor (EvView *view, EvViewCursor new_cursor)
 599 {
 600         GdkCursor *cursor = NULL;
 601         GdkDisplay *display;
 602         GtkWidget *widget;
 603
 604         if (view->cursor == new_cursor) {
 605                 return;
 606         }
 607
 608         widget = gtk_widget_get_toplevel (GTK_WIDGET (view));
 609         display = gtk_widget_get_display (widget);
 610         view->cursor = new_cursor;
 611
 612         switch (new_cursor) {
 613                 case EV_VIEW_CURSOR_NORMAL:
 614                         gdk_window_set_cursor (widget->window, NULL);
 615                         break;
 616                 case EV_VIEW_CURSOR_LINK:
 617                         cursor = gdk_cursor_new_for_display (display, GDK_HAND2);
 618                         break;
 619                 case EV_VIEW_CURSOR_WAIT:
 620                         cursor = gdk_cursor_new_for_display (display, GDK_WATCH);
 621                         break;
 622         }
 623
 624         if (cursor) {
 625                 gdk_window_set_cursor (widget->window, cursor);
 626                 gdk_cursor_unref (cursor);
 627                 gdk_flush();
 628         }
 629 }
 630
 631 static gboolean
 632 ev_view_motion_notify_event (GtkWidget      *widget,
 633                              GdkEventMotion *event)
 634 {
 635         EvView *view = EV_VIEW (widget);
 636
 637         if (view->pressed_button > 0) {
 638                 view->has_selection = TRUE;
 639                 view->selection.x = MIN (view->selection_start.x, event->x);
 640                 view->selection.y = MIN (view->selection_start.y, event->y);
 641                 view->selection.width = ABS (view->selection_start.x - event->x) + 1;
 642                 view->selection.height = ABS (view->selection_start.y - event->y) + 1;
 643         } else if (view->document) {
 644                 EvLink *link;
 645
 646                 link = ev_document_get_link (view->document, event->x, event->y);
 647                 if (link) {
 648                         char *msg;
 649
 650                         msg = status_message_from_link (link);
 651                         ev_view_set_status (view, msg);
 652                         ev_view_set_cursor (view, EV_VIEW_CURSOR_LINK);
 653                         g_free (msg);
 654
 655                         g_object_unref (link);
 656                 } else {
 657                         ev_view_set_status (view, NULL);
 658                         if (view->cursor == EV_VIEW_CURSOR_LINK) {
 659                                 ev_view_set_cursor (view, EV_VIEW_CURSOR_NORMAL);
 660                         }
 661                 }
 662         }
 663
 664         gtk_widget_queue_draw (widget);
 665
 666         return TRUE;
 667 }
 668
 669 static gboolean
 670 ev_view_button_release_event (GtkWidget      *widget,
 671                               GdkEventButton *event)
 672 {
 673         EvView *view = EV_VIEW (widget);
 674
 675         view->pressed_button = -1;
 676
 677         if (view->has_selection) {
 678                 ev_view_update_primary_selection (view);
 679         } else if (view->document) {
 680                 EvLink *link;
 681
 682                 link = ev_document_get_link (view->document,
 683                                              event->x,
 684                                              event->y);
 685                 if (link) {
 686                         ev_view_go_to_link (view, link);
 687                         g_object_unref (link);
 688                 }
 689         }
 690
 691         return FALSE;
 692 }
 693
 694 static void
 695 on_adjustment_value_changed (GtkAdjustment  *adjustment,
 696                              EvView *view)
 697 {
 698         view_update_adjustments (view);
 699 }
 700
 701 static void
 702 set_scroll_adjustment (EvView *view,
 703                        GtkOrientation  orientation,
 704                        GtkAdjustment  *adjustment)
 705 {
 706         GtkAdjustment **to_set;
 707
 708         if (orientation == GTK_ORIENTATION_HORIZONTAL)
 709                 to_set = &view->hadjustment;
 710         else
 711                 to_set = &view->vadjustment;
 712
 713         if (*to_set != adjustment) {
 714                 if (*to_set) {
 715                         g_signal_handlers_disconnect_by_func (*to_set,
 716                                                               (gpointer) on_adjustment_value_changed,
 717                                                               view);
 718                         g_object_unref (*to_set);
 719                 }
 720
 721                 *to_set = adjustment;
 722                 view_set_adjustment_values (view, orientation);
 723
 724                 if (*to_set) {
 725                         g_object_ref (*to_set);
 726                         g_signal_connect (*to_set, "value_changed",
 727                                           G_CALLBACK (on_adjustment_value_changed), view);
 728                 }
 729         }
 730 }
 731
 732 static void
 733 ev_view_set_scroll_adjustments (EvView *view,
 734                                 GtkAdjustment  *hadjustment,
 735                                 GtkAdjustment  *vadjustment)
 736 {
 737         set_scroll_adjustment (view, GTK_ORIENTATION_HORIZONTAL, hadjustment);
 738         set_scroll_adjustment (view, GTK_ORIENTATION_VERTICAL, vadjustment);
 739
 740         view_update_adjustments (view);
 741 }
 742
 743 static void
 744 add_scroll_binding (GtkBindingSet  *binding_set,
 745                     guint           keyval,
 746                     GtkScrollType   scroll,
 747                     gboolean        horizontal)
 748 {
 749   guint keypad_keyval = keyval - GDK_Left + GDK_KP_Left;
 750
 751   gtk_binding_entry_add_signal (binding_set, keyval, 0,
 752                                 "scroll_view", 2,
 753                                 GTK_TYPE_SCROLL_TYPE, scroll,
 754                                 G_TYPE_BOOLEAN, horizontal);
 755   gtk_binding_entry_add_signal (binding_set, keypad_keyval, 0,
 756                                 "scroll_view", 2,
 757                                 GTK_TYPE_SCROLL_TYPE, scroll,
 758                                 G_TYPE_BOOLEAN, horizontal);
 759 }
 760
 761 static void
 762 ev_view_scroll_view (EvView *view,
 763                      GtkScrollType scroll,
 764                      gboolean horizontal)
 765 {
 766         if (scroll == GTK_SCROLL_PAGE_BACKWARD) {
 767                 ev_view_set_page (view, ev_view_get_page (view) - 1);
 768         } else if (scroll == GTK_SCROLL_PAGE_FORWARD) {
 769                 ev_view_set_page (view, ev_view_get_page (view) + 1);
 770         } else {
 771                 GtkAdjustment *adjustment;
 772                 double value;
 773
 774                 if (horizontal) {
 775                         adjustment = view->hadjustment;
 776                 } else {
 777                         adjustment = view->vadjustment;
 778                 }
 779
 780                 value = adjustment->value;
 781
 782                 switch (scroll) {
 783                         case GTK_SCROLL_STEP_BACKWARD:
 784                                 value -= adjustment->step_increment;
 785                                 break;
 786                         case GTK_SCROLL_STEP_FORWARD:
 787                                 value += adjustment->step_increment;
 788                                 break;
 789                         default:
 790                                 break;
 791                 }
 792
 793                 value = CLAMP (value, adjustment->lower,
 794                                adjustment->upper - adjustment->page_size);
 795
 796                 gtk_adjustment_set_value (adjustment, value);
 797         }
 798 }
 799
 800 static void
 801 ev_view_set_property (GObject *object,
 802                       guint prop_id,
 803                       const GValue *value,
 804                       GParamSpec *pspec)
 805 {
 806         switch (prop_id)
 807         {
 808                 /* Read only */
 809                 case PROP_STATUS:
 810                 case PROP_FIND_STATUS:
 811                         break;
 812         }
 813 }
 814
 815 static void
 816 ev_view_get_property (GObject *object,
 817                       guint prop_id,
 818                       GValue *value,
 819                       GParamSpec *pspec)
 820 {
 821         EvView *view = EV_VIEW (object);
 822
 823         switch (prop_id)
 824         {
 825                 case PROP_STATUS:
 826                         g_value_set_string (value, view->status);
 827                         break;
 828                 case PROP_FIND_STATUS:
 829                         g_value_set_string (value, view->status);
 830                         break;
 831         }
 832 }
 833
 834 static void
 835 ev_view_class_init (EvViewClass *class)
 836 {
 837         GObjectClass *object_class = G_OBJECT_CLASS (class);
 838         GtkObjectClass *gtk_object_class = GTK_OBJECT_CLASS (class);
 839         GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
 840         GtkBindingSet *binding_set;
 841
 842         object_class->finalize = ev_view_finalize;
 843         object_class->set_property = ev_view_set_property;
 844         object_class->get_property = ev_view_get_property;
 845
 846         widget_class->expose_event = ev_view_expose_event;
 847         widget_class->button_press_event = ev_view_button_press_event;
 848         widget_class->motion_notify_event = ev_view_motion_notify_event;
 849         widget_class->button_release_event = ev_view_button_release_event;
 850         widget_class->size_request = ev_view_size_request;
 851         widget_class->size_allocate = ev_view_size_allocate;
 852         widget_class->realize = ev_view_realize;
 853         widget_class->unrealize = ev_view_unrealize;
 854         gtk_object_class->destroy = ev_view_destroy;
 855
 856         class->set_scroll_adjustments = ev_view_set_scroll_adjustments;
 857         class->scroll_view = ev_view_scroll_view;
 858
 859         widget_class->set_scroll_adjustments_signal =  g_signal_new ("set-scroll-adjustments",
 860                                                                      G_OBJECT_CLASS_TYPE (object_class),
 861                                                                      G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 862                                                                      G_STRUCT_OFFSET (EvViewClass, set_scroll_adjustments),
 863                                                                      NULL, NULL,
 864                                                                      ev_marshal_VOID__OBJECT_OBJECT,
 865                                                                      G_TYPE_NONE, 2,
 866                                                                      GTK_TYPE_ADJUSTMENT,
 867                                                                      GTK_TYPE_ADJUSTMENT);
 868         page_changed_signal = g_signal_new ("page-changed",
 869                                             G_OBJECT_CLASS_TYPE (object_class),
 870                                             G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 871                                             G_STRUCT_OFFSET (EvViewClass, page_changed),
 872                                             NULL, NULL,
 873                                             ev_marshal_VOID__NONE,
 874                                             G_TYPE_NONE, 0);
 875
 876         g_signal_new ("scroll_view",
 877                       G_TYPE_FROM_CLASS (object_class),
 878                       G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 879                       G_STRUCT_OFFSET (EvViewClass, scroll_view),
 880                       NULL, NULL,
 881                       ev_marshal_VOID__ENUM_BOOLEAN,
 882                       G_TYPE_NONE, 2,
 883                       GTK_TYPE_SCROLL_TYPE,
 884                       G_TYPE_BOOLEAN);
 885
 886         g_object_class_install_property (object_class,
 887                                          PROP_STATUS,
 888                                          g_param_spec_string ("status",
 889                                                               "Status Message",
 890                                                               "The status message",
 891                                                               NULL,
 892                                                               G_PARAM_READABLE));
 893
 894         g_object_class_install_property (object_class,
 895                                          PROP_STATUS,
 896                                          g_param_spec_string ("find-status",
 897                                                               "Find Status Message",
 898                                                               "The find status message",
 899                                                               NULL,
 900                                                               G_PARAM_READABLE));
 901
 902         binding_set = gtk_binding_set_by_class (class);
 903
 904         add_scroll_binding (binding_set, GDK_Left,  GTK_SCROLL_STEP_BACKWARD, TRUE);
 905         add_scroll_binding (binding_set, GDK_Right, GTK_SCROLL_STEP_FORWARD,  TRUE);
 906         add_scroll_binding (binding_set, GDK_Up,    GTK_SCROLL_STEP_BACKWARD, FALSE);
 907         add_scroll_binding (binding_set, GDK_Down,  GTK_SCROLL_STEP_FORWARD,  FALSE);
 908
 909         add_scroll_binding (binding_set, GDK_Page_Up,   GTK_SCROLL_PAGE_BACKWARD, FALSE);
 910         add_scroll_binding (binding_set, GDK_Page_Down, GTK_SCROLL_PAGE_FORWARD,  FALSE);
 911 }
 912
 913 static void
 914 ev_view_init (EvView *view)
 915 {
 916         GTK_WIDGET_SET_FLAGS (view, GTK_CAN_FOCUS);
 917
 918         view->scale = 1.0;
 919         view->pressed_button = -1;
 920         view->cursor = EV_VIEW_CURSOR_NORMAL;
 921
 922         view->find_results = g_array_new (FALSE,
 923                                           FALSE,
 924                                           sizeof (EvFindResult));
 925         view->results_on_this_page = 0;
 926         view->next_page_with_result = 0;
 927 }
 928
 929 static char *
 930 ev_view_get_find_status_message (EvView *view)
 931 {
 932         if (view->find_results->len == 0) {
 933                 if (view->find_percent_complete >= (1.0 - 1e-10)) {
 934                         return g_strdup (_("Not found"));
 935                 } else {
 936                         return g_strdup_printf (_("%3d%% remaining to search"),
 937                                                 (int) ((1.0 - view->find_percent_complete) * 100));
 938                 }
 939         } else if (view->results_on_this_page == 0) {
 940                 g_assert (view->next_page_with_result != 0);
 941                 return g_strdup_printf (_("Found on page %d"),
 942                                         view->next_page_with_result);
 943         } else {
 944                 return g_strdup_printf (_("%d found on this page"),
 945                                         view->results_on_this_page);
 946         }
 947 }
 948
 949 static void
 950 update_find_results (EvView *view)
 951 {
 952         const EvFindResult *results;
 953         int i;
 954         int on_this_page;
 955         int next_page_with_result;
 956         int earliest_page_with_result;
 957         int current_page;
 958         gboolean counts_changed;
 959
 960         results = (EvFindResult*) view->find_results->data;
 961         current_page = ev_document_get_page (view->document);
 962         next_page_with_result = 0;
 963         on_this_page = 0;
 964         earliest_page_with_result = 0;
 965
 966         i = 0;
 967         while (i < view->find_results->len) {
 968                 if (results[i].page_num == current_page) {
 969                         ++on_this_page;
 970                 } else {
 971                         int delta = results[i].page_num - current_page;
 972
 973                         if (delta > 0 && /* result on later page */
 974                             (next_page_with_result == 0 ||
 975                              results[i].page_num < next_page_with_result))
 976                                 next_page_with_result = results[i].page_num;
 977
 978                         if (delta < 0 && /* result on a previous page */
 979                             (earliest_page_with_result == 0 ||
 980                              results[i].page_num < earliest_page_with_result))
 981                                 earliest_page_with_result = results[i].page_num;
 982                 }
 983                 ++i;
 984         }
 985
 986         /* If earliest page is just the current page, there is no earliest page */
 987         if (earliest_page_with_result == current_page)
 988                 earliest_page_with_result = 0;
 989
 990         /* If no next page, then wrap and the wrapped page is the next page */
 991         if (next_page_with_result == 0)
 992                 next_page_with_result = earliest_page_with_result;
 993
 994         counts_changed = FALSE;
 995         if (on_this_page != view->results_on_this_page ||
 996             next_page_with_result != view->next_page_with_result) {
 997                 view->results_on_this_page = on_this_page;
 998                 view->next_page_with_result = next_page_with_result;
 999                 counts_changed = TRUE;
1000         }
1001
1002         if (counts_changed ||
1003             view->find_results->len == 0) {
1004                 char *message;
1005
1006                 message = ev_view_get_find_status_message (view);
1007                 ev_view_set_find_status (view, message);
1008                 g_free (message);
1009         }
1010 }
1011
1012 static void
1013 found_results_callback (EvDocument         *document,
1014                         const EvFindResult *results,
1015                         int                 n_results,
1016                         double              percent_complete,
1017                         void               *data)
1018 {
1019   EvView *view = EV_VIEW (data);
1020
1021   g_array_set_size (view->find_results, 0);
1022
1023   if (n_results > 0)
1024           g_array_append_vals (view->find_results,
1025                                results, n_results);
1026
1027 #if 0
1028   {
1029           int i;
1030
1031           g_printerr ("%d results %d%%: ", n_results,
1032                       (int) (percent_complete * 100));
1033           i = 0;
1034           while (i < n_results) {
1035                   g_printerr ("%d ", results[i].page_num);
1036                   ++i;
1037           }
1038           g_printerr ("\n");
1039   }
1040 #endif
1041
1042   view->find_percent_complete = percent_complete;
1043   update_find_results (view);
1044
1045   gtk_widget_queue_draw (GTK_WIDGET (view));
1046 }
1047
1048 static void
1049 document_changed_callback (EvDocument *document,
1050                            EvView     *view)
1051 {
1052         gtk_widget_queue_draw (GTK_WIDGET (view));
1053         ev_view_set_cursor (view, EV_VIEW_CURSOR_NORMAL);
1054 }
1055
1056 /*** Public API ***/
1057
1058 GtkWidget*
1059 ev_view_new (void)
1060 {
1061         return g_object_new (EV_TYPE_VIEW, NULL);
1062 }
1063
1064 void
1065 ev_view_set_document (EvView     *view,
1066                       EvDocument *document)
1067 {
1068         g_return_if_fail (EV_IS_VIEW (view));
1069
1070         if (document != view->document) {
1071                 if (view->document) {
1072                         g_signal_handlers_disconnect_by_func (view->document,
1073                                                               found_results_callback,
1074                                                               view);
1075                         g_array_set_size (view->find_results, 0);
1076                         view->results_on_this_page = 0;
1077                         view->next_page_with_result = 0;
1078
1079                         g_object_unref (view->document);
1080                 }
1081
1082                 view->document = document;
1083
1084                 if (view->document) {
1085                         g_object_ref (view->document);
1086                         if (EV_IS_DOCUMENT_FIND (view->document))
1087                                 g_signal_connect (view->document,
1088                                                   "found",
1089                                                   G_CALLBACK (found_results_callback),
1090                                                   view);
1091                         g_signal_connect (view->document,
1092                                           "changed",
1093                                           G_CALLBACK (document_changed_callback),
1094                                           view);
1095                 }
1096
1097                 if (GTK_WIDGET_REALIZED (view))
1098                         ev_document_set_target (view->document, view->bin_window);
1099
1100                 gtk_widget_queue_resize (GTK_WIDGET (view));
1101
1102                 g_signal_emit (view, page_changed_signal, 0);
1103         }
1104 }
1105
1106 static void
1107 set_document_page (EvView *view, int page)
1108 {
1109         if (view->document) {
1110                 int old_page = ev_document_get_page (view->document);
1111                 int old_width, old_height;
1112
1113                 ev_document_get_page_size (view->document,
1114                                            &old_width, &old_height);
1115
1116                 if (old_page != page) {
1117                         ev_view_set_cursor (view, EV_VIEW_CURSOR_WAIT);
1118                         ev_document_set_page (view->document, page);
1119                 }
1120
1121                 if (old_page != ev_document_get_page (view->document)) {
1122                         int width, height;
1123
1124                         g_signal_emit (view, page_changed_signal, 0);
1125
1126                         view->has_selection = FALSE;
1127                         ev_document_get_page_size (view->document,
1128                                                    &width, &height);
1129                         if (width != old_width || height != old_height)
1130                                 gtk_widget_queue_resize (GTK_WIDGET (view));
1131
1132                         view->find_percent_complete = 0.0;
1133                         update_find_results (view);
1134                 }
1135         }
1136 }
1137
1138 static void
1139 go_to_link (EvView *view, EvLink *link)
1140 {
1141         EvLinkType type;
1142         const char *uri;
1143         int page;
1144
1145         type = ev_link_get_link_type (link);
1146
1147         switch (type) {
1148                 case EV_LINK_TYPE_TITLE:
1149                         break;
1150                 case EV_LINK_TYPE_PAGE:
1151                         page = ev_link_get_page (link);
1152                         set_document_page (view, page);
1153                         break;
1154                 case EV_LINK_TYPE_EXTERNAL_URI:
1155                         uri = ev_link_get_uri (link);
1156                         gnome_vfs_url_show (uri);
1157                         break;
1158         }
1159 }
1160
1161 void
1162 ev_view_go_to_link (EvView *view, EvLink *link)
1163 {
1164         EvLinkType type;
1165
1166         go_to_link (view, link);
1167
1168         type = ev_link_get_link_type (link);
1169         if (type == EV_LINK_TYPE_PAGE) {
1170                 ev_history_add_link (view->history, link);
1171         }
1172 }
1173
1174 static void
1175 go_to_index (EvView *view, int index)
1176 {
1177         EvLink *link;
1178
1179         link = ev_history_get_link_nth (view->history, index);
1180         g_return_if_fail (link != NULL);
1181
1182         go_to_link (view, link);
1183 }
1184
1185 gboolean
1186 ev_view_can_go_back (EvView *view)
1187 {
1188         int index, n;
1189
1190         if (view->history == NULL) {
1191                 return FALSE;
1192         }
1193
1194         index = ev_history_get_current_index (view->history);
1195         n = ev_history_get_n_links (view->history);
1196
1197         if (n > 0) {
1198                 return index != MAX (0, index - 1);
1199         } else {
1200                 return FALSE;
1201         }
1202 }
1203
1204 void
1205 ev_view_go_back (EvView *view)
1206 {
1207         int index, n;
1208
1209         g_return_if_fail (EV_IS_HISTORY (view->history));
1210
1211         index = ev_history_get_current_index (view->history);
1212         n = ev_history_get_n_links (view->history);
1213
1214         if (n > 0) {
1215                 index = MAX (0, index - 1);
1216                 ev_history_set_current_index (view->history, index);
1217         }
1218 }
1219
1220 gboolean
1221 ev_view_can_go_forward (EvView *view)
1222 {
1223         int index, n;
1224
1225         if (view->history == NULL) {
1226                 return FALSE;
1227         }
1228
1229         index = ev_history_get_current_index (view->history);
1230         n = ev_history_get_n_links (view->history);
1231
1232         if (n > 0) {
1233                 return  index != MIN (n - 1, index + 1);
1234         } else {
1235                 return FALSE;
1236         }
1237 }
1238
1239 void
1240 ev_view_go_forward (EvView *view)
1241 {
1242         int index, n;
1243
1244         g_return_if_fail (EV_IS_HISTORY (view->history));
1245
1246         index = ev_history_get_current_index (view->history);
1247         n = ev_history_get_n_links (view->history);
1248
1249         if (n > 0) {
1250                 index = MIN (n - 1, index + 1);
1251                 ev_history_set_current_index (view->history, index);
1252         }
1253 }
1254
1255
1256 void
1257 ev_view_set_page (EvView *view,
1258                   int     page)
1259 {
1260         g_return_if_fail (EV_IS_VIEW (view));
1261         g_return_if_fail (EV_IS_HISTORY (view->history));
1262
1263         set_document_page (view, page);
1264         ev_history_add_page (view->history, page);
1265 }
1266
1267 int
1268 ev_view_get_page (EvView *view)
1269 {
1270         if (view->document)
1271                 return ev_document_get_page (view->document);
1272         else
1273                 return 1;
1274 }
1275
1276 #define ZOOM_IN_FACTOR  1.2
1277 #define ZOOM_OUT_FACTOR (1.0/ZOOM_IN_FACTOR)
1278
1279 #define MIN_SCALE 0.05409
1280 #define MAX_SCALE 18.4884
1281
1282 static void
1283 ev_view_zoom (EvView   *view,
1284               double    factor,
1285               gboolean  relative)
1286 {
1287         double scale;
1288
1289         if (relative)
1290                 scale = view->scale * factor;
1291         else
1292                 scale = factor;
1293
1294         view->scale = CLAMP (scale, MIN_SCALE, MAX_SCALE);
1295
1296         ev_document_set_scale (view->document, view->scale);
1297
1298         gtk_widget_queue_resize (GTK_WIDGET (view));
1299 }
1300
1301 void
1302 ev_view_zoom_in (EvView *view)
1303 {
1304         ev_view_zoom (view, ZOOM_IN_FACTOR, TRUE);
1305 }
1306
1307 void
1308 ev_view_zoom_out (EvView *view)
1309 {
1310         ev_view_zoom (view, ZOOM_OUT_FACTOR, TRUE);
1311 }
1312
1313 void
1314 ev_view_normal_size (EvView *view)
1315 {
1316         ev_view_zoom (view, 1.0, FALSE);
1317 }
1318
1319 void
1320 ev_view_best_fit (EvView *view)
1321 {
1322         double scale;
1323         int width, height;
1324
1325         width = height = 0;
1326         ev_document_get_page_size (view->document, &width, &height);
1327
1328         scale = 1.0;
1329         if (width != 0 && height != 0) {
1330                 double scale_w, scale_h;
1331
1332                 scale_w = (double)GTK_WIDGET (view)->allocation.width * view->scale / width;
1333                 scale_h = (double)GTK_WIDGET (view)->allocation.height * view->scale / height;
1334
1335                 scale = (scale_w < scale_h) ? scale_w : scale_h;
1336         }
1337
1338         ev_view_zoom (view, scale, FALSE);
1339 }
1340
1341 void
1342 ev_view_fit_width (EvView *view)
1343 {
1344         double scale = 1.0;
1345         int width;
1346
1347         width = 0;
1348         ev_document_get_page_size (view->document, &width, NULL);
1349
1350         scale = 1.0;
1351         if (width != 0)
1352                 scale = (double)GTK_WIDGET (view)->allocation.width * view->scale / width;
1353
1354         ev_view_zoom (view, scale, FALSE);
1355 }
1356
1357 static void
1358 history_index_changed_cb (EvHistory  *history,
1359                           GParamSpec *pspec,
1360                           EvView     *view)
1361 {
1362         int index;
1363
1364         index = ev_history_get_current_index (history);
1365         go_to_index (view, index);
1366 }
1367
1368 void
1369 ev_view_set_history (EvView     *view,
1370                      EvHistory  *history)
1371 {
1372         if (view->history) {
1373                 g_object_unref (view->history);
1374         }
1375
1376         view->history = g_object_ref (history);
1377         ev_history_add_page (view->history, ev_view_get_page (view));
1378
1379         g_signal_connect (view->history, "notify::index",
1380                           G_CALLBACK (history_index_changed_cb),
1381                           view);
1382 }
1383
1384 const char *
1385 ev_view_get_status (EvView *view)
1386 {
1387         g_return_val_if_fail (EV_IS_VIEW (view), NULL);
1388
1389         return view->status;
1390 }
1391
1392 const char *
1393 ev_view_get_find_status (EvView *view)
1394 {
1395         g_return_val_if_fail (EV_IS_VIEW (view), NULL);
1396
1397         return view->find_status;
1398 }
1399
1400