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         LOG ("Finalize");
 187
 188         if (view->document)
 189                 g_object_unref (view->document);
 190
 191         ev_view_set_scroll_adjustments (view, NULL, NULL);
 192
 193         G_OBJECT_CLASS (ev_view_parent_class)->finalize (object);
 194 }
 195
 196 static void
 197 ev_view_destroy (GtkObject *object)
 198 {
 199         EvView *view = EV_VIEW (object);
 200
 201         ev_view_set_scroll_adjustments (view, NULL, NULL);
 202
 203         GTK_OBJECT_CLASS (ev_view_parent_class)->destroy (object);
 204 }
 205
 206 static void
 207 ev_view_size_request (GtkWidget      *widget,
 208                       GtkRequisition *requisition)
 209 {
 210         EvView *view = EV_VIEW (widget);
 211
 212         if (GTK_WIDGET_REALIZED (widget)) {
 213                 if (view->document) {
 214                         ev_document_get_page_size (view->document,
 215                                                    -1,
 216                                                    &requisition->width,
 217                                                    &requisition->height);
 218                 } else {
 219                         requisition->width = 10;
 220                         requisition->height = 10;
 221                 }
 222
 223                 requisition->width += 2;
 224                 requisition->height += 2;
 225         }
 226
 227 }
 228
 229 static void
 230 ev_view_size_allocate (GtkWidget      *widget,
 231                        GtkAllocation  *allocation)
 232 {
 233         EvView *view = EV_VIEW (widget);
 234
 235         GTK_WIDGET_CLASS (ev_view_parent_class)->size_allocate (widget, allocation);
 236
 237         view_set_adjustment_values (view, GTK_ORIENTATION_HORIZONTAL);
 238         view_set_adjustment_values (view, GTK_ORIENTATION_VERTICAL);
 239
 240         if (GTK_WIDGET_REALIZED (widget)) {
 241                 gdk_window_resize (view->bin_window,
 242                                    MAX (widget->allocation.width, widget->requisition.width),
 243                                    MAX (widget->allocation.height, widget->requisition.height));
 244         }
 245 }
 246
 247 static void
 248 ev_view_realize (GtkWidget *widget)
 249 {
 250         EvView *view = EV_VIEW (widget);
 251         GdkWindowAttr attributes;
 252
 253         GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 254
 255         attributes.window_type = GDK_WINDOW_CHILD;
 256         attributes.wclass = GDK_INPUT_OUTPUT;
 257         attributes.visual = gtk_widget_get_visual (widget);
 258         attributes.colormap = gtk_widget_get_colormap (widget);
 259
 260         attributes.x = widget->allocation.x;
 261         attributes.y = widget->allocation.y;
 262         attributes.width = widget->allocation.width;
 263         attributes.height = widget->allocation.height;
 264         attributes.event_mask = 0;
 265
 266         widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
 267                                          &attributes,
 268                                          GDK_WA_X | GDK_WA_Y |
 269                                          GDK_WA_COLORMAP |
 270                                          GDK_WA_VISUAL);
 271         gdk_window_set_user_data (widget->window, widget);
 272         widget->style = gtk_style_attach (widget->style, widget->window);
 273
 274         attributes.x = 0;
 275         attributes.y = 0;
 276         attributes.width = MAX (widget->allocation.width, widget->requisition.width);
 277         attributes.height = MAX (widget->allocation.height, widget->requisition.height);
 278         attributes.event_mask = GDK_EXPOSURE_MASK |
 279                                 GDK_BUTTON_PRESS_MASK |
 280                                 GDK_BUTTON_RELEASE_MASK |
 281                                 GDK_SCROLL_MASK |
 282                                 GDK_KEY_PRESS_MASK |
 283                                 GDK_POINTER_MOTION_MASK;
 284
 285         view->bin_window = gdk_window_new (widget->window,
 286                                            &attributes,
 287                                            GDK_WA_X | GDK_WA_Y |
 288                                            GDK_WA_COLORMAP |
 289                                            GDK_WA_VISUAL);
 290         gdk_window_set_user_data (view->bin_window, widget);
 291         gdk_window_show (view->bin_window);
 292
 293         widget->style = gtk_style_attach (widget->style, view->bin_window);
 294         gdk_window_set_background (view->bin_window, &widget->style->mid[widget->state]);
 295
 296         if (view->document) {
 297                 ev_document_set_target (view->document, view->bin_window);
 298
 299                 /* We can't get page size without a target, so we have to
 300                  * queue a size request at realization. Could be fixed
 301                  * with EvDocument changes to allow setting a GdkScreen
 302                  * without setting a target.
 303                  */
 304                 gtk_widget_queue_resize (widget);
 305         }
 306 }
 307
 308 static void
 309 ev_view_unrealize (GtkWidget *widget)
 310 {
 311         EvView *view = EV_VIEW (widget);
 312
 313         if (view->document)
 314                 ev_document_set_target (view->document, NULL);
 315
 316         gdk_window_set_user_data (view->bin_window, NULL);
 317         gdk_window_destroy (view->bin_window);
 318         view->bin_window = NULL;
 319
 320         GTK_WIDGET_CLASS (ev_view_parent_class)->unrealize (widget);
 321 }
 322
 323 static guint32
 324 ev_gdk_color_to_rgb (const GdkColor *color)
 325 {
 326   guint32 result;
 327   result = (0xff0000 | (color->red & 0xff00));
 328   result <<= 8;
 329   result |= ((color->green & 0xff00) | (color->blue >> 8));
 330   return result;
 331 }
 332
 333 static void
 334 draw_rubberband (GtkWidget *widget, GdkWindow *window,
 335                  const GdkRectangle *rect, guchar alpha)
 336 {
 337         GdkGC *gc;
 338         GdkPixbuf *pixbuf;
 339         GdkColor *fill_color_gdk;
 340         guint fill_color;
 341
 342         fill_color_gdk = gdk_color_copy (&GTK_WIDGET (widget)->style->base[GTK_STATE_SELECTED]);
 343         fill_color = ev_gdk_color_to_rgb (fill_color_gdk) << 8 | alpha;
 344
 345         pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8,
 346                                  rect->width, rect->height);
 347         gdk_pixbuf_fill (pixbuf, fill_color);
 348
 349         gdk_draw_pixbuf (window, NULL, pixbuf,
 350                          0, 0,
 351                          rect->x,rect->y,
 352                          rect->width, rect->height,
 353                          GDK_RGB_DITHER_NONE,
 354                          0, 0);
 355
 356         g_object_unref (pixbuf);
 357
 358         gc = gdk_gc_new (window);
 359         gdk_gc_set_rgb_fg_color (gc, fill_color_gdk);
 360         gdk_draw_rectangle (window, gc, FALSE,
 361                             rect->x, rect->y,
 362                             rect->width - 1,
 363                             rect->height - 1);
 364         g_object_unref (gc);
 365
 366         gdk_color_free (fill_color_gdk);
 367 }
 368
 369 static void
 370 highlight_find_results (EvView *view)
 371 {
 372         EvDocumentFind *find = EV_DOCUMENT_FIND (view->document);
 373         int i, results;
 374
 375         results = ev_document_find_get_n_results (find);
 376
 377         for (i = 0; i < results; i++) {
 378                 GdkRectangle rectangle;
 379                 guchar alpha;
 380
 381                 alpha = (i == view->find_result) ? 0x90 : 0x20;
 382                 ev_document_find_get_result (find, i, &rectangle);
 383                 draw_rubberband (GTK_WIDGET (view), view->bin_window,
 384                                  &rectangle, alpha);
 385         }
 386 }
 387
 388 static void
 389 expose_bin_window (GtkWidget      *widget,
 390                    GdkEventExpose *event)
 391 {
 392         EvView *view = EV_VIEW (widget);
 393         int x_offset, y_offset;
 394
 395         if (view->document == NULL)
 396                 return;
 397
 398         x_offset = MAX (0, (widget->allocation.width -
 399                             widget->requisition.width) / 2);
 400         y_offset = MAX (0, (widget->allocation.height -
 401                             widget->requisition.height) / 2);
 402         gdk_draw_rectangle (view->bin_window,
 403                             widget->style->black_gc,
 404                             FALSE,
 405                             x_offset,
 406                             y_offset,
 407                             widget->requisition.width - 1,
 408                             widget->requisition.height - 1);
 409
 410         ev_document_set_page_offset (view->document,
 411                                      x_offset + 1,
 412                                      y_offset + 1);
 413
 414         LOG ("Render area %d %d %d %d", event->area.x, event->area.y,
 415              event->area.width, event->area.height);
 416
 417         ev_document_render (view->document,
 418                             event->area.x, event->area.y,
 419                             event->area.width, event->area.height);
 420
 421         if (EV_IS_DOCUMENT_FIND (view->document)) {
 422                 highlight_find_results (view);
 423         }
 424
 425         if (view->has_selection) {
 426                 draw_rubberband (widget, view->bin_window,
 427                                  &view->selection, 0x40);
 428         }
 429 }
 430
 431 static gboolean
 432 ev_view_expose_event (GtkWidget      *widget,
 433                       GdkEventExpose *event)
 434 {
 435         EvView *view = EV_VIEW (widget);
 436
 437         if (event->window == view->bin_window)
 438                 expose_bin_window (widget, event);
 439         else
 440                 return GTK_WIDGET_CLASS (ev_view_parent_class)->expose_event (widget, event);
 441
 442         return FALSE;
 443 }
 444
 445 void
 446 ev_view_select_all (EvView *ev_view)
 447 {
 448         GtkWidget *widget = GTK_WIDGET (ev_view);
 449
 450         g_return_if_fail (EV_IS_VIEW (ev_view));
 451
 452         ev_view->has_selection = TRUE;
 453         ev_view->selection.x = ev_view->selection.y = 0;
 454         ev_view->selection.width = widget->requisition.width;
 455         ev_view->selection.height = widget->requisition.height;
 456
 457         gtk_widget_queue_draw (widget);
 458 }
 459
 460 void
 461 ev_view_copy (EvView *ev_view)
 462 {
 463         GtkClipboard *clipboard;
 464         char *text;
 465
 466         text = ev_document_get_text (ev_view->document, &ev_view->selection);
 467         clipboard = gtk_widget_get_clipboard (GTK_WIDGET (ev_view),
 468                                               GDK_SELECTION_CLIPBOARD);
 469         gtk_clipboard_set_text (clipboard, text, -1);
 470         g_free (text);
 471 }
 472
 473 static void
 474 ev_view_primary_get_cb (GtkClipboard     *clipboard,
 475                         GtkSelectionData *selection_data,
 476                         guint             info,
 477                         gpointer          data)
 478 {
 479         EvView *ev_view = EV_VIEW (data);
 480         char *text;
 481
 482         text = ev_document_get_text (ev_view->document, &ev_view->selection);
 483         gtk_selection_data_set_text (selection_data, text, -1);
 484 }
 485
 486 static void
 487 ev_view_primary_clear_cb (GtkClipboard *clipboard,
 488                           gpointer      data)
 489 {
 490         EvView *ev_view = EV_VIEW (data);
 491
 492         ev_view->has_selection = FALSE;
 493 }
 494
 495 static void
 496 ev_view_update_primary_selection (EvView *ev_view)
 497 {
 498         GtkClipboard *clipboard;
 499
 500         clipboard = gtk_widget_get_clipboard (GTK_WIDGET (ev_view),
 501                                               GDK_SELECTION_PRIMARY);
 502
 503         if (ev_view->has_selection) {
 504                 if (!gtk_clipboard_set_with_owner (clipboard,
 505                                                    targets,
 506                                                    G_N_ELEMENTS (targets),
 507                                                    ev_view_primary_get_cb,
 508                                                    ev_view_primary_clear_cb,
 509                                                    G_OBJECT (ev_view)))
 510                         ev_view_primary_clear_cb (clipboard, ev_view);
 511         } else {
 512                 if (gtk_clipboard_get_owner (clipboard) == G_OBJECT (ev_view))
 513                         gtk_clipboard_clear (clipboard);
 514         }
 515 }
 516
 517 static gboolean
 518 ev_view_button_press_event (GtkWidget      *widget,
 519                             GdkEventButton *event)
 520 {
 521         EvView *view = EV_VIEW (widget);
 522
 523         if (!GTK_WIDGET_HAS_FOCUS (widget)) {
 524                 gtk_widget_grab_focus (widget);
 525         }
 526
 527         view->pressed_button = event->button;
 528
 529         switch (event->button) {
 530                 case 1:
 531                         if (view->has_selection) {
 532                                 view->has_selection = FALSE;
 533                                 gtk_widget_queue_draw (widget);
 534                         }
 535
 536                         view->selection_start.x = event->x;
 537                         view->selection_start.y = event->y;
 538                         break;
 539         }
 540
 541         return TRUE;
 542 }
 543
 544 static char *
 545 status_message_from_link (EvLink *link)
 546 {
 547         EvLinkType type;
 548         char *msg;
 549         int page;
 550
 551         type = ev_link_get_link_type (link);
 552
 553         switch (type) {
 554                 case EV_LINK_TYPE_TITLE:
 555                         msg = g_strdup (ev_link_get_title (link));
 556                         break;
 557                 case EV_LINK_TYPE_PAGE:
 558                         page = ev_link_get_page (link);
 559                         msg = g_strdup_printf (_("Go to page %d"), page);
 560                         break;
 561                 case EV_LINK_TYPE_EXTERNAL_URI:
 562                         msg = g_strdup (ev_link_get_uri (link));
 563                         break;
 564                 default:
 565                         msg = NULL;
 566         }
 567
 568         return msg;
 569 }
 570
 571 static void
 572 ev_view_set_status (EvView *view, const char *message)
 573 {
 574         g_return_if_fail (EV_IS_VIEW (view));
 575
 576         if (message != view->status) {
 577                 g_free (view->status);
 578                 view->status = g_strdup (message);
 579                 g_object_notify (G_OBJECT (view), "status");
 580         }
 581 }
 582
 583 static void
 584 ev_view_set_find_status (EvView *view, const char *message)
 585 {
 586         g_return_if_fail (EV_IS_VIEW (view));
 587
 588         g_free (view->find_status);
 589         view->find_status = g_strdup (message);
 590         g_object_notify (G_OBJECT (view), "find-status");
 591 }
 592
 593
 594 static void
 595 ev_view_set_cursor (EvView *view, EvViewCursor new_cursor)
 596 {
 597         GdkCursor *cursor = NULL;
 598         GdkDisplay *display;
 599         GtkWidget *widget;
 600
 601         if (view->cursor == new_cursor) {
 602                 return;
 603         }
 604
 605         widget = gtk_widget_get_toplevel (GTK_WIDGET (view));
 606         display = gtk_widget_get_display (widget);
 607         view->cursor = new_cursor;
 608
 609         switch (new_cursor) {
 610                 case EV_VIEW_CURSOR_NORMAL:
 611                         gdk_window_set_cursor (widget->window, NULL);
 612                         break;
 613                 case EV_VIEW_CURSOR_LINK:
 614                         cursor = gdk_cursor_new_for_display (display, GDK_HAND2);
 615                         break;
 616                 case EV_VIEW_CURSOR_WAIT:
 617                         cursor = gdk_cursor_new_for_display (display, GDK_WATCH);
 618                         break;
 619         }
 620
 621         if (cursor) {
 622                 gdk_window_set_cursor (widget->window, cursor);
 623                 gdk_cursor_unref (cursor);
 624                 gdk_flush();
 625         }
 626 }
 627
 628 static gboolean
 629 ev_view_motion_notify_event (GtkWidget      *widget,
 630                              GdkEventMotion *event)
 631 {
 632         EvView *view = EV_VIEW (widget);
 633
 634         if (view->pressed_button > 0) {
 635                 view->has_selection = TRUE;
 636                 view->selection.x = MIN (view->selection_start.x, event->x);
 637                 view->selection.y = MIN (view->selection_start.y, event->y);
 638                 view->selection.width = ABS (view->selection_start.x - event->x) + 1;
 639                 view->selection.height = ABS (view->selection_start.y - event->y) + 1;
 640
 641                 gtk_widget_queue_draw (widget);
 642         } else if (view->document) {
 643                 EvLink *link;
 644
 645                 link = ev_document_get_link (view->document, event->x, event->y);
 646                 if (link) {
 647                         char *msg;
 648
 649                         msg = status_message_from_link (link);
 650                         ev_view_set_status (view, msg);
 651                         ev_view_set_cursor (view, EV_VIEW_CURSOR_LINK);
 652                         g_free (msg);
 653
 654                         g_object_unref (link);
 655                 } else {
 656                         ev_view_set_status (view, NULL);
 657                         if (view->cursor == EV_VIEW_CURSOR_LINK) {
 658                                 ev_view_set_cursor (view, EV_VIEW_CURSOR_NORMAL);
 659                         }
 660                 }
 661         }
 662
 663         return TRUE;
 664 }
 665
 666 static gboolean
 667 ev_view_button_release_event (GtkWidget      *widget,
 668                               GdkEventButton *event)
 669 {
 670         EvView *view = EV_VIEW (widget);
 671
 672         view->pressed_button = -1;
 673
 674         if (view->has_selection) {
 675                 ev_view_update_primary_selection (view);
 676         } else if (view->document) {
 677                 EvLink *link;
 678
 679                 link = ev_document_get_link (view->document,
 680                                              event->x,
 681                                              event->y);
 682                 if (link) {
 683                         ev_view_go_to_link (view, link);
 684                         g_object_unref (link);
 685                 }
 686         }
 687
 688         return FALSE;
 689 }
 690
 691 static void
 692 on_adjustment_value_changed (GtkAdjustment  *adjustment,
 693                              EvView *view)
 694 {
 695         view_update_adjustments (view);
 696 }
 697
 698 static void
 699 set_scroll_adjustment (EvView *view,
 700                        GtkOrientation  orientation,
 701                        GtkAdjustment  *adjustment)
 702 {
 703         GtkAdjustment **to_set;
 704
 705         if (orientation == GTK_ORIENTATION_HORIZONTAL)
 706                 to_set = &view->hadjustment;
 707         else
 708                 to_set = &view->vadjustment;
 709
 710         if (*to_set != adjustment) {
 711                 if (*to_set) {
 712                         g_signal_handlers_disconnect_by_func (*to_set,
 713                                                               (gpointer) on_adjustment_value_changed,
 714                                                               view);
 715                         g_object_unref (*to_set);
 716                 }
 717
 718                 *to_set = adjustment;
 719                 view_set_adjustment_values (view, orientation);
 720
 721                 if (*to_set) {
 722                         g_object_ref (*to_set);
 723                         g_signal_connect (*to_set, "value_changed",
 724                                           G_CALLBACK (on_adjustment_value_changed), view);
 725                 }
 726         }
 727 }
 728
 729 static void
 730 ev_view_set_scroll_adjustments (EvView *view,
 731                                 GtkAdjustment  *hadjustment,
 732                                 GtkAdjustment  *vadjustment)
 733 {
 734         set_scroll_adjustment (view, GTK_ORIENTATION_HORIZONTAL, hadjustment);
 735         set_scroll_adjustment (view, GTK_ORIENTATION_VERTICAL, vadjustment);
 736
 737         view_update_adjustments (view);
 738 }
 739
 740 static void
 741 add_scroll_binding (GtkBindingSet  *binding_set,
 742                     guint           keyval,
 743                     GtkScrollType   scroll,
 744                     gboolean        horizontal)
 745 {
 746   guint keypad_keyval = keyval - GDK_Left + GDK_KP_Left;
 747
 748   gtk_binding_entry_add_signal (binding_set, keyval, 0,
 749                                 "scroll_view", 2,
 750                                 GTK_TYPE_SCROLL_TYPE, scroll,
 751                                 G_TYPE_BOOLEAN, horizontal);
 752   gtk_binding_entry_add_signal (binding_set, keypad_keyval, 0,
 753                                 "scroll_view", 2,
 754                                 GTK_TYPE_SCROLL_TYPE, scroll,
 755                                 G_TYPE_BOOLEAN, horizontal);
 756 }
 757
 758 static void
 759 ev_view_scroll_view (EvView *view,
 760                      GtkScrollType scroll,
 761                      gboolean horizontal)
 762 {
 763         if (scroll == GTK_SCROLL_PAGE_BACKWARD) {
 764                 ev_view_set_page (view, ev_view_get_page (view) - 1);
 765         } else if (scroll == GTK_SCROLL_PAGE_FORWARD) {
 766                 ev_view_set_page (view, ev_view_get_page (view) + 1);
 767         } else {
 768                 GtkAdjustment *adjustment;
 769                 double value;
 770
 771                 if (horizontal) {
 772                         adjustment = view->hadjustment;
 773                 } else {
 774                         adjustment = view->vadjustment;
 775                 }
 776
 777                 value = adjustment->value;
 778
 779                 switch (scroll) {
 780                         case GTK_SCROLL_STEP_BACKWARD:
 781                                 value -= adjustment->step_increment;
 782                                 break;
 783                         case GTK_SCROLL_STEP_FORWARD:
 784                                 value += adjustment->step_increment;
 785                                 break;
 786                         default:
 787                                 break;
 788                 }
 789
 790                 value = CLAMP (value, adjustment->lower,
 791                                adjustment->upper - adjustment->page_size);
 792
 793                 gtk_adjustment_set_value (adjustment, value);
 794         }
 795 }
 796
 797 static void
 798 ev_view_set_property (GObject *object,
 799                       guint prop_id,
 800                       const GValue *value,
 801                       GParamSpec *pspec)
 802 {
 803         switch (prop_id)
 804         {
 805                 /* Read only */
 806                 case PROP_STATUS:
 807                 case PROP_FIND_STATUS:
 808                         break;
 809         }
 810 }
 811
 812 static void
 813 ev_view_get_property (GObject *object,
 814                       guint prop_id,
 815                       GValue *value,
 816                       GParamSpec *pspec)
 817 {
 818         EvView *view = EV_VIEW (object);
 819
 820         switch (prop_id)
 821         {
 822                 case PROP_STATUS:
 823                         g_value_set_string (value, view->status);
 824                         break;
 825                 case PROP_FIND_STATUS:
 826                         g_value_set_string (value, view->status);
 827                         break;
 828         }
 829 }
 830
 831 static void
 832 ev_view_class_init (EvViewClass *class)
 833 {
 834         GObjectClass *object_class = G_OBJECT_CLASS (class);
 835         GtkObjectClass *gtk_object_class = GTK_OBJECT_CLASS (class);
 836         GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
 837         GtkBindingSet *binding_set;
 838
 839         object_class->finalize = ev_view_finalize;
 840         object_class->set_property = ev_view_set_property;
 841         object_class->get_property = ev_view_get_property;
 842
 843         widget_class->expose_event = ev_view_expose_event;
 844         widget_class->button_press_event = ev_view_button_press_event;
 845         widget_class->motion_notify_event = ev_view_motion_notify_event;
 846         widget_class->button_release_event = ev_view_button_release_event;
 847         widget_class->size_request = ev_view_size_request;
 848         widget_class->size_allocate = ev_view_size_allocate;
 849         widget_class->realize = ev_view_realize;
 850         widget_class->unrealize = ev_view_unrealize;
 851         gtk_object_class->destroy = ev_view_destroy;
 852
 853         class->set_scroll_adjustments = ev_view_set_scroll_adjustments;
 854         class->scroll_view = ev_view_scroll_view;
 855
 856         widget_class->set_scroll_adjustments_signal =  g_signal_new ("set-scroll-adjustments",
 857                                                                      G_OBJECT_CLASS_TYPE (object_class),
 858                                                                      G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 859                                                                      G_STRUCT_OFFSET (EvViewClass, set_scroll_adjustments),
 860                                                                      NULL, NULL,
 861                                                                      ev_marshal_VOID__OBJECT_OBJECT,
 862                                                                      G_TYPE_NONE, 2,
 863                                                                      GTK_TYPE_ADJUSTMENT,
 864                                                                      GTK_TYPE_ADJUSTMENT);
 865         page_changed_signal = g_signal_new ("page-changed",
 866                                             G_OBJECT_CLASS_TYPE (object_class),
 867                                             G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 868                                             G_STRUCT_OFFSET (EvViewClass, page_changed),
 869                                             NULL, NULL,
 870                                             ev_marshal_VOID__NONE,
 871                                             G_TYPE_NONE, 0);
 872
 873         g_signal_new ("scroll_view",
 874                       G_TYPE_FROM_CLASS (object_class),
 875                       G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 876                       G_STRUCT_OFFSET (EvViewClass, scroll_view),
 877                       NULL, NULL,
 878                       ev_marshal_VOID__ENUM_BOOLEAN,
 879                       G_TYPE_NONE, 2,
 880                       GTK_TYPE_SCROLL_TYPE,
 881                       G_TYPE_BOOLEAN);
 882
 883         g_object_class_install_property (object_class,
 884                                          PROP_STATUS,
 885                                          g_param_spec_string ("status",
 886                                                               "Status Message",
 887                                                               "The status message",
 888                                                               NULL,
 889                                                               G_PARAM_READABLE));
 890
 891         g_object_class_install_property (object_class,
 892                                          PROP_STATUS,
 893                                          g_param_spec_string ("find-status",
 894                                                               "Find Status Message",
 895                                                               "The find status message",
 896                                                               NULL,
 897                                                               G_PARAM_READABLE));
 898
 899         binding_set = gtk_binding_set_by_class (class);
 900
 901         add_scroll_binding (binding_set, GDK_Left,  GTK_SCROLL_STEP_BACKWARD, TRUE);
 902         add_scroll_binding (binding_set, GDK_Right, GTK_SCROLL_STEP_FORWARD,  TRUE);
 903         add_scroll_binding (binding_set, GDK_Up,    GTK_SCROLL_STEP_BACKWARD, FALSE);
 904         add_scroll_binding (binding_set, GDK_Down,  GTK_SCROLL_STEP_FORWARD,  FALSE);
 905
 906         add_scroll_binding (binding_set, GDK_Page_Up,   GTK_SCROLL_PAGE_BACKWARD, FALSE);
 907         add_scroll_binding (binding_set, GDK_Page_Down, GTK_SCROLL_PAGE_FORWARD,  FALSE);
 908 }
 909
 910 static void
 911 ev_view_init (EvView *view)
 912 {
 913         GTK_WIDGET_SET_FLAGS (view, GTK_CAN_FOCUS);
 914
 915         view->scale = 1.0;
 916         view->pressed_button = -1;
 917         view->cursor = EV_VIEW_CURSOR_NORMAL;
 918 }
 919
 920 static void
 921 update_find_status_message (EvView *view)
 922 {
 923         char *message;
 924
 925         if (ev_document_get_page (view->document) == view->find_page) {
 926                 int results;
 927
 928                 results = ev_document_find_get_n_results
 929                                 (EV_DOCUMENT_FIND (view->document));
 930
 931                 message = g_strdup_printf (_("%d found on this page"),
 932                                            results);
 933         } else {
 934                 double percent;
 935
 936                 percent = ev_document_find_get_progress
 937                                 (EV_DOCUMENT_FIND (view->document));
 938
 939                 if (percent >= (1.0 - 1e-10)) {
 940                         message = g_strdup (_("Not found"));
 941                 } else {
 942                         message = g_strdup_printf (_("%3d%% remaining to search"),
 943                                                    (int) ((1.0 - percent) * 100));
 944                 }
 945
 946         }
 947
 948         ev_view_set_find_status (view, message);
 949         g_free (message);
 950 }
 951
 952 static void
 953 set_document_page (EvView *view, int new_page)
 954 {
 955         int page;
 956         int pages;
 957
 958         pages = ev_document_get_n_pages (view->document);
 959         page = CLAMP (new_page, 1, pages);
 960
 961         if (view->document) {
 962                 int old_page = ev_document_get_page (view->document);
 963                 int old_width, old_height;
 964
 965                 ev_document_get_page_size (view->document,
 966                                            -1,
 967                                            &old_width, &old_height);
 968
 969                 if (old_page != page) {
 970                         ev_view_set_cursor (view, EV_VIEW_CURSOR_WAIT);
 971                         ev_document_set_page (view->document, page);
 972                 }
 973
 974                 if (old_page != ev_document_get_page (view->document)) {
 975                         int width, height;
 976
 977                         g_signal_emit (view, page_changed_signal, 0);
 978
 979                         view->has_selection = FALSE;
 980                         ev_document_get_page_size (view->document,
 981                                                    -1,
 982                                                    &width, &height);
 983                         if (width != old_width || height != old_height)
 984                                 gtk_widget_queue_resize (GTK_WIDGET (view));
 985
 986                         gtk_adjustment_set_value (view->vadjustment,
 987                                                   view->vadjustment->lower);
 988                 }
 989
 990                 view->find_page = page;
 991                 view->find_result = 0;
 992
 993                 if (EV_IS_DOCUMENT_FIND (view->document)) {
 994                         update_find_status_message (view);
 995                 }
 996         }
 997 }
 998
 999 #define MARGIN 5
1000
1001 static void
1002 ensure_rectangle_is_visible (EvView *view, GdkRectangle *rect)
1003 {
1004         GtkWidget *widget = GTK_WIDGET (view);
1005         GtkAdjustment *adjustment;
1006         int value;
1007
1008         adjustment = view->vadjustment;
1009
1010         if (rect->y < adjustment->value) {
1011                 value = MAX (adjustment->lower, rect->y - MARGIN);
1012                 gtk_adjustment_set_value (view->vadjustment, value);
1013         } else if (rect->y + rect->height >
1014                    adjustment->value + widget->allocation.height) {
1015                 value = MIN (adjustment->upper, rect->y + rect->height -
1016                              widget->allocation.height + MARGIN);
1017                 gtk_adjustment_set_value (view->vadjustment, value);
1018         }
1019
1020         adjustment = view->hadjustment;
1021
1022         if (rect->x < adjustment->value) {
1023                 value = MAX (adjustment->lower, rect->x - MARGIN);
1024                 gtk_adjustment_set_value (view->hadjustment, value);
1025         } else if (rect->x + rect->height >
1026                    adjustment->value + widget->allocation.width) {
1027                 value = MIN (adjustment->upper, rect->x + rect->width -
1028                              widget->allocation.width + MARGIN);
1029                 gtk_adjustment_set_value (view->hadjustment, value);
1030         }
1031 }
1032
1033 static void
1034 jump_to_find_result (EvView *view)
1035 {
1036         EvDocumentFind *find = EV_DOCUMENT_FIND (view->document);
1037         GdkRectangle rect;
1038         int n_results;
1039
1040         n_results = ev_document_find_get_n_results (find);
1041
1042         if (n_results > view->find_result) {
1043                 ev_document_find_get_result
1044                         (find, view->find_result, &rect);
1045                 ensure_rectangle_is_visible (view, &rect);
1046         }
1047 }
1048
1049 static void
1050 jump_to_find_page (EvView *view)
1051 {
1052         int n_pages, i;
1053
1054         n_pages = ev_document_get_n_pages (view->document);
1055
1056         for (i = 0; i <= n_pages; i++) {
1057                 int has_results;
1058                 int page;
1059
1060                 page = i + view->find_page;
1061                 if (page > n_pages) {
1062                         page = page - n_pages;
1063                 }
1064
1065                 has_results = ev_document_find_page_has_results
1066                                 (EV_DOCUMENT_FIND (view->document), page);
1067                 if (has_results == -1) {
1068                         view->find_page = page;
1069                         break;
1070                 } else if (has_results == 1) {
1071                         set_document_page (view, page);
1072                         jump_to_find_result (view);
1073                         break;
1074                 }
1075         }
1076 }
1077
1078 static void
1079 find_changed_cb (EvDocument *document, int page, EvView *view)
1080 {
1081         jump_to_find_page (view);
1082         jump_to_find_result (view);
1083         update_find_status_message (view);
1084
1085         if (ev_document_get_page (document) == page) {
1086                 gtk_widget_queue_draw (GTK_WIDGET (view));
1087         }
1088 }
1089
1090 static void
1091 document_changed_callback (EvDocument *document,
1092                            EvView     *view)
1093 {
1094         gtk_widget_queue_draw (GTK_WIDGET (view));
1095         ev_view_set_cursor (view, EV_VIEW_CURSOR_NORMAL);
1096 }
1097
1098 /*** Public API ***/
1099
1100 GtkWidget*
1101 ev_view_new (void)
1102 {
1103         return g_object_new (EV_TYPE_VIEW, NULL);
1104 }
1105
1106 void
1107 ev_view_set_document (EvView     *view,
1108                       EvDocument *document)
1109 {
1110         g_return_if_fail (EV_IS_VIEW (view));
1111
1112         if (document != view->document) {
1113                 if (view->document) {
1114                         g_signal_handlers_disconnect_by_func
1115                                 (view->document, find_changed_cb, view);
1116                         g_object_unref (view->document);
1117                 }
1118
1119                 view->document = document;
1120                 view->find_page = 1;
1121                 view->find_result = 0;
1122
1123                 if (view->document) {
1124                         g_object_ref (view->document);
1125                         if (EV_IS_DOCUMENT_FIND (view->document)) {
1126                                 g_signal_connect (view->document,
1127                                                   "find_changed",
1128                                                   G_CALLBACK (find_changed_cb),
1129                                                   view);
1130                         }
1131                         g_signal_connect (view->document,
1132                                           "changed",
1133                                           G_CALLBACK (document_changed_callback),
1134                                           view);
1135                 }
1136
1137                 if (GTK_WIDGET_REALIZED (view))
1138                         ev_document_set_target (view->document, view->bin_window);
1139
1140                 gtk_widget_queue_resize (GTK_WIDGET (view));
1141
1142                 g_signal_emit (view, page_changed_signal, 0);
1143         }
1144 }
1145
1146 static void
1147 go_to_link (EvView *view, EvLink *link)
1148 {
1149         EvLinkType type;
1150         const char *uri;
1151         int page;
1152
1153         type = ev_link_get_link_type (link);
1154
1155         switch (type) {
1156                 case EV_LINK_TYPE_TITLE:
1157                         break;
1158                 case EV_LINK_TYPE_PAGE:
1159                         page = ev_link_get_page (link);
1160                         set_document_page (view, page);
1161                         break;
1162                 case EV_LINK_TYPE_EXTERNAL_URI:
1163                         uri = ev_link_get_uri (link);
1164                         gnome_vfs_url_show (uri);
1165                         break;
1166         }
1167 }
1168
1169 void
1170 ev_view_go_to_link (EvView *view, EvLink *link)
1171 {
1172         go_to_link (view, link);
1173 }
1174
1175 void
1176 ev_view_set_page (EvView *view,
1177                   int     page)
1178 {
1179         g_return_if_fail (EV_IS_VIEW (view));
1180
1181         set_document_page (view, page);
1182 }
1183
1184 int
1185 ev_view_get_page (EvView *view)
1186 {
1187         if (view->document)
1188                 return ev_document_get_page (view->document);
1189         else
1190                 return 1;
1191 }
1192
1193 #define ZOOM_IN_FACTOR  1.2
1194 #define ZOOM_OUT_FACTOR (1.0/ZOOM_IN_FACTOR)
1195
1196 #define MIN_SCALE 0.05409
1197 #define MAX_SCALE 18.4884
1198
1199 static void
1200 ev_view_zoom (EvView   *view,
1201               double    factor,
1202               gboolean  relative)
1203 {
1204         double scale;
1205
1206         if (relative)
1207                 scale = view->scale * factor;
1208         else
1209                 scale = factor;
1210
1211         view->scale = CLAMP (scale, MIN_SCALE, MAX_SCALE);
1212
1213         ev_document_set_scale (view->document, view->scale);
1214
1215         gtk_widget_queue_resize (GTK_WIDGET (view));
1216 }
1217
1218 void
1219 ev_view_zoom_in (EvView *view)
1220 {
1221         ev_view_zoom (view, ZOOM_IN_FACTOR, TRUE);
1222 }
1223
1224 void
1225 ev_view_zoom_out (EvView *view)
1226 {
1227         ev_view_zoom (view, ZOOM_OUT_FACTOR, TRUE);
1228 }
1229
1230 void
1231 ev_view_normal_size (EvView *view)
1232 {
1233         ev_view_zoom (view, 1.0, FALSE);
1234 }
1235
1236 /* Unfortunately this is not idempotent (!) (numerical stability
1237  * issues because width and height are rounded)
1238  *
1239  * One more reason to make this a toggle and not a command */
1240 void
1241 ev_view_best_fit (EvView *view, int allocation_width, int allocation_height)
1242 {
1243         double scale;
1244         int available_width, available_height;
1245         int width, height;
1246
1247         width = height = 0;
1248         /* This is the bad part. You could make it stable by doing
1249          * ev_document_set_scale 1.0. But at least with pdf this means
1250          * redrawing the whole page */
1251         ev_document_get_page_size (view->document, -1, &width, &height);
1252
1253         LOG ("Best fit %d %d", allocation_width, allocation_height);
1254
1255         scale = 1.0;
1256         if (width != 0 && height != 0) {
1257                 double scale_w, scale_h;
1258
1259                 available_width = MAX (1, allocation_width - 2); /* 1 px border left and right */
1260                 available_height = MAX (1, allocation_height - 2); /* 1 px border above and below */
1261
1262                 scale_w = (double)available_width * view->scale / (width + 0.5);
1263                 scale_h = (double)available_height * view->scale / (height + 0.5);
1264
1265                 scale = (scale_w < scale_h) ? scale_w : scale_h;
1266         }
1267
1268         ev_view_zoom (view, scale, FALSE);
1269 }
1270
1271 void
1272 ev_view_fit_width (EvView *view, int allocation_width, int allocation_height,
1273                    int vsb_width)
1274 {
1275         int available_width, available_height;
1276         int width, height;
1277         double scale = 1.0;
1278
1279         width = height = 0;
1280         ev_document_get_page_size (view->document, -1, &width, &height);
1281
1282         scale = 1.0;
1283         if (width != 0) {
1284                 available_width = MAX (1, allocation_width - 2); /* 1px border */
1285                 available_height = MAX (1, allocation_height - 2); /* 1px border */
1286
1287                 scale = (double)available_width * view->scale / (width + 0.5);
1288
1289                 if ((height + 0.5) * scale / view->scale > available_height)
1290                         scale = ((double)(available_width - vsb_width) * view->scale /
1291                                  (width + 0.5));
1292         }
1293
1294         ev_view_zoom (view, scale, FALSE);
1295 }
1296
1297 const char *
1298 ev_view_get_status (EvView *view)
1299 {
1300         g_return_val_if_fail (EV_IS_VIEW (view), NULL);
1301
1302         return view->status;
1303 }
1304
1305 const char *
1306 ev_view_get_find_status (EvView *view)
1307 {
1308         g_return_val_if_fail (EV_IS_VIEW (view), NULL);
1309
1310         return view->find_status;
1311 }
1312
1313 void
1314 ev_view_find_next (EvView *view)
1315 {
1316         int n_results, n_pages;
1317         EvDocumentFind *find = EV_DOCUMENT_FIND (view->document);
1318
1319         n_results = ev_document_find_get_n_results (find);
1320         n_pages = ev_document_get_n_pages (view->document);
1321
1322         view->find_result++;
1323
1324         if (view->find_result >= n_results) {
1325                 view->find_result = 0;
1326                 view->find_page++;
1327
1328                 if (view->find_page > n_pages) {
1329                         view->find_page = 1;
1330                 }
1331
1332                 jump_to_find_page (view);
1333         } else {
1334                 jump_to_find_result (view);
1335                 gtk_widget_queue_draw (GTK_WIDGET (view));
1336         }
1337 }
1338
1339 void
1340 ev_view_find_previous (EvView *view)
1341 {
1342         int n_results, n_pages;
1343         EvDocumentFind *find = EV_DOCUMENT_FIND (view->document);
1344
1345         n_results = ev_document_find_get_n_results (find);
1346         n_pages = ev_document_get_n_pages (view->document);
1347
1348         view->find_result--;
1349
1350         if (view->find_result < 0) {
1351                 view->find_result = 0;
1352                 view->find_page--;
1353
1354                 if (view->find_page < 1) {
1355                         view->find_page = n_pages;
1356                 }
1357
1358                 jump_to_find_page (view);
1359         } else {
1360                 jump_to_find_result (view);
1361                 gtk_widget_queue_draw (GTK_WIDGET (view));
1362         }
1363 }