src/ui_tree_edit.c

   1 /*
   2  * (SLIK) SimpLIstic sKin functions
   3  * (C) 2004 John Ellis
   4  * Copyright (C) 2008 - 2009 The Geeqie Team
   5  *
   6  * Author: John Ellis
   7  *
   8  * This software is released under the GNU General Public License (GNU GPL).
   9  * Please read the included file COPYING for more information.
  10  * This software comes with no warranty of any kind, use at your own risk!
  11  */
  12
  13 #ifdef HAVE_CONFIG_H
  14 #  include "config.h"
  15 #endif
  16 #include "intl.h"
  17
  18 #include <stdio.h>
  19 #include <stdlib.h>
  20 #include <string.h>
  21
  22 #include <gtk/gtk.h>
  23 #include <gdk/gdkkeysyms.h>
  24
  25 #include "ui_tree_edit.h"
  26
  27 /*
  28  *-------------------------------------------------------------------
  29  * cell popup editor
  30  *-------------------------------------------------------------------
  31  */
  32
  33 static void tree_edit_close(TreeEditData *ted)
  34 {
  35         gtk_grab_remove(ted->window);
  36         gdk_keyboard_ungrab(GDK_CURRENT_TIME);
  37         gdk_pointer_ungrab(GDK_CURRENT_TIME);
  38
  39         gtk_widget_destroy(ted->window);
  40
  41         g_free(ted->old_name);
  42         g_free(ted->new_name);
  43         gtk_tree_path_free(ted->path);
  44
  45         g_free(ted);
  46 }
  47
  48 static void tree_edit_do(TreeEditData *ted)
  49 {
  50         ted->new_name = g_strdup(gtk_entry_get_text(GTK_ENTRY(ted->entry)));
  51
  52         if (strcmp(ted->new_name, ted->old_name) != 0)
  53                 {
  54                 if (ted->edit_func)
  55                         {
  56                         if (ted->edit_func(ted, ted->old_name, ted->new_name, ted->edit_data))
  57                                 {
  58                                 /* hmm, should the caller be required to set text instead ? */
  59                                 }
  60                         }
  61                 }
  62 }
  63
  64 static gboolean tree_edit_click_end_cb(GtkWidget *widget, GdkEventButton *event, gpointer data)
  65 {
  66         TreeEditData *ted = data;
  67
  68         tree_edit_do(ted);
  69         tree_edit_close(ted);
  70
  71         return TRUE;
  72 }
  73
  74 static gboolean tree_edit_click_cb(GtkWidget *widget, GdkEventButton *event, gpointer data)
  75 {
  76         TreeEditData *ted = data;
  77
  78         gint x, y;
  79         gint w, h;
  80
  81         gint xr, yr;
  82
  83         xr = (gint)event->x_root;
  84         yr = (gint)event->y_root;
  85
  86         gdk_window_get_origin(ted->window->window, &x, &y);
  87         gdk_drawable_get_size(ted->window->window, &w, &h);
  88
  89         if (xr < x || yr < y || xr > x + w || yr > y + h)
  90                 {
  91                 /* gobble the release event, so it does not propgate to an underlying widget */
  92                 g_signal_connect(G_OBJECT(ted->window), "button_release_event",
  93                                  G_CALLBACK(tree_edit_click_end_cb), ted);
  94                 return TRUE;
  95                 }
  96         return FALSE;
  97 }
  98
  99 static gboolean tree_edit_key_press_cb(GtkWidget *widget, GdkEventKey *event, gpointer data)
 100 {
 101         TreeEditData *ted = data;
 102
 103         switch (event->keyval)
 104                 {
 105                 case GDK_Return:
 106                 case GDK_KP_Enter:
 107                 case GDK_Tab:           /* ok, we are going to intercept the focus change
 108                                            from keyboard and act like return was hit */
 109                 case GDK_ISO_Left_Tab:
 110                 case GDK_Up:
 111                 case GDK_Down:
 112                 case GDK_KP_Up:
 113                 case GDK_KP_Down:
 114                 case GDK_KP_Left:
 115                 case GDK_KP_Right:
 116                         tree_edit_do(ted);
 117                         tree_edit_close(ted);
 118                         break;
 119                 case GDK_Escape:
 120                         tree_edit_close(ted);
 121                         break;
 122                 default:
 123                         break;
 124                 }
 125
 126         return FALSE;
 127 }
 128
 129 static gboolean tree_edit_by_path_idle_cb(gpointer data)
 130 {
 131         TreeEditData *ted = data;
 132         GdkRectangle rect;
 133         gint x, y, w, h;        /* geometry of cell within tree */
 134         gint wx, wy;            /* geometry of tree from root window */
 135         gint sx, sw;
 136
 137         gtk_tree_view_get_cell_area(ted->tree, ted->path, ted->column, &rect);
 138
 139         x = rect.x;
 140         y = rect.y;
 141         w = rect.width + 4;
 142         h = rect.height + 4;
 143
 144         if (gtk_tree_view_column_cell_get_position(ted->column, ted->cell, &sx, &sw))
 145                 {
 146                 x += sx;
 147                 w = MAX(w - sx, sw);
 148                 }
 149
 150         gdk_window_get_origin(gtk_tree_view_get_bin_window(ted->tree), &wx, &wy);
 151
 152         x += wx - 2; /* the -val is to 'fix' alignment of entry position */
 153         y += wy - 2;
 154
 155         /* now show it */
 156         gtk_widget_set_size_request(ted->window, w, h);
 157         gtk_widget_realize(ted->window);
 158         gtk_window_move(GTK_WINDOW(ted->window), x, y);
 159         gtk_window_resize(GTK_WINDOW(ted->window), w, h);
 160         gtk_widget_show(ted->window);
 161
 162         /* grab it */
 163         gtk_widget_grab_focus(ted->entry);
 164         /* explicitely set the focus flag for the entry, for some reason on popup windows this
 165          * is not set, and causes no edit cursor to appear ( popups not allowed focus? )
 166          */
 167         GTK_WIDGET_SET_FLAGS(ted->entry, GTK_HAS_FOCUS);
 168         gtk_grab_add(ted->window);
 169         gdk_pointer_grab(ted->window->window, TRUE,
 170                          GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK | GDK_BUTTON_MOTION_MASK,
 171                          NULL, NULL, GDK_CURRENT_TIME);
 172         gdk_keyboard_grab(ted->window->window, TRUE, GDK_CURRENT_TIME);
 173
 174         return FALSE;
 175 }
 176
 177 gboolean tree_edit_by_path(GtkTreeView *tree, GtkTreePath *tpath, gint column, const gchar *text,
 178                            gboolean (*edit_func)(TreeEditData *, const gchar *, const gchar *, gpointer), gpointer data)
 179 {
 180         TreeEditData *ted;
 181         GtkTreeViewColumn *tcolumn;
 182         GtkCellRenderer *cell = NULL;
 183         GList *list;
 184         GList *work;
 185
 186         if (!edit_func) return FALSE;
 187         if (!GTK_WIDGET_VISIBLE(tree)) return FALSE;
 188
 189         tcolumn = gtk_tree_view_get_column(tree, column);
 190         if (!tcolumn) return FALSE;
 191
 192 #if GTK_CHECK_VERSION(2,18,0)
 193         list = gtk_cell_layout_get_cells(GTK_CELL_LAYOUT(tcolumn));
 194 #else
 195         list = gtk_tree_view_column_get_cell_renderers(tcolumn);
 196 #endif
 197         work = list;
 198         while (work && !cell)
 199                 {
 200                 cell = work->data;
 201                 if (!GTK_IS_CELL_RENDERER_TEXT(cell))
 202                         {
 203                         cell = NULL;
 204                         }
 205                 work = work->next;
 206                 }
 207
 208         g_list_free(list);
 209         if (!cell) return FALSE;
 210
 211         if (!text) text = "";
 212
 213         ted = g_new0(TreeEditData, 1);
 214
 215         ted->old_name = g_strdup(text);
 216
 217         ted->edit_func = edit_func;
 218         ted->edit_data = data;
 219
 220         ted->tree = tree;
 221         ted->path = gtk_tree_path_copy(tpath);
 222         ted->column = tcolumn;
 223         ted->cell = cell;
 224
 225         gtk_tree_view_scroll_to_cell(ted->tree, ted->path, ted->column, FALSE, 0.0, 0.0);
 226
 227         /* create the window */
 228
 229         ted->window = gtk_window_new(GTK_WINDOW_POPUP);
 230         gtk_window_set_resizable(GTK_WINDOW(ted->window), FALSE);
 231         g_signal_connect(G_OBJECT(ted->window), "button_press_event",
 232                          G_CALLBACK(tree_edit_click_cb), ted);
 233         g_signal_connect(G_OBJECT(ted->window), "key_press_event",
 234                          G_CALLBACK(tree_edit_key_press_cb), ted);
 235
 236         ted->entry = gtk_entry_new();
 237         gtk_entry_set_text(GTK_ENTRY(ted->entry), ted->old_name);
 238         gtk_editable_select_region(GTK_EDITABLE(ted->entry), 0, strlen(ted->old_name));
 239         gtk_container_add(GTK_CONTAINER(ted->window), ted->entry);
 240         gtk_widget_show(ted->entry);
 241
 242         /* due to the fact that gtktreeview scrolls in an idle loop, we cannot
 243          * reliably get the cell position until those scroll priority signals are processed
 244          */
 245         g_idle_add_full(G_PRIORITY_DEFAULT_IDLE - 2, tree_edit_by_path_idle_cb, ted, NULL);
 246
 247         return TRUE;
 248 }
 249
 250 /*
 251  *-------------------------------------------------------------------
 252  * tree cell position retrieval
 253  *-------------------------------------------------------------------
 254  */
 255
 256 gboolean tree_view_get_cell_origin(GtkTreeView *widget, GtkTreePath *tpath, gint column, gboolean text_cell_only,
 257                                    gint *x, gint *y, gint *width, gint *height)
 258 {
 259         gint x_origin, y_origin;
 260         gint x_offset, y_offset;
 261         gint header_size;
 262         GtkTreeViewColumn *tv_column;
 263         GdkRectangle rect;
 264
 265         tv_column = gtk_tree_view_get_column(widget, column);
 266         if (!tv_column || !tpath) return FALSE;
 267
 268         /* hmm, appears the rect will not account for X scroll, but does for Y scroll
 269          * use x_offset instead for X scroll (sigh)
 270          */
 271         gtk_tree_view_get_cell_area(widget, tpath, tv_column, &rect);
 272 #if GTK_CHECK_VERSION(2,12,0)
 273         gtk_tree_view_convert_tree_to_widget_coords(widget, 0, 0, &x_offset, &y_offset);
 274 #else
 275         gtk_tree_view_tree_to_widget_coords(widget, 0, 0, &x_offset, &y_offset);
 276 #endif
 277         gdk_window_get_origin(GTK_WIDGET(widget)->window, &x_origin, &y_origin);
 278
 279         if (gtk_tree_view_get_headers_visible(widget))
 280                 {
 281                 header_size = tv_column->button->allocation.height;
 282                 }
 283         else
 284                 {
 285                 header_size = 0;
 286                 }
 287
 288         if (text_cell_only)
 289                 {
 290                 GtkCellRenderer *cell = NULL;
 291                 GList *renderers;
 292                 GList *work;
 293                 gint cell_x;
 294                 gint cell_width;
 295
 296 #if GTK_CHECK_VERSION(2,18,0)
 297                 renderers = gtk_cell_layout_get_cells(GTK_CELL_LAYOUT(tv_column));
 298 #else
 299                 renderers = gtk_tree_view_column_get_cell_renderers(tv_column);
 300 #endif
 301                 work = renderers;
 302                 while (work && !cell)
 303                         {
 304                         cell = work->data;
 305                         work = work->next;
 306                         if (!GTK_IS_CELL_RENDERER_TEXT(cell)) cell = NULL;
 307                         }
 308                 g_list_free(renderers);
 309
 310                 if (!cell) return FALSE;
 311
 312                 if (!gtk_tree_view_column_cell_get_position(tv_column, cell, &cell_x, &cell_width))
 313                         {
 314                         cell_x = 0;
 315                         cell_width = rect.width;
 316                         }
 317                 *x = x_origin + x_offset + rect.x + cell_x;
 318                 *width = cell_width;
 319                 }
 320         else
 321                 {
 322                 *x = x_origin + x_offset + rect.x;
 323                 *width = rect.width;
 324                 }
 325         *y = y_origin + rect.y + header_size;
 326         *height = rect.height;
 327         return TRUE;
 328 }
 329
 330 void tree_view_get_cell_clamped(GtkTreeView *widget, GtkTreePath *tpath, gint column, gboolean text_cell_only,
 331                                 gint *x, gint *y, gint *width, gint *height)
 332 {
 333         gint wx, wy, ww, wh;
 334         GdkWindow *window;
 335
 336         window = GTK_WIDGET(widget)->window;
 337         gdk_window_get_origin(window, &wx, &wy);
 338         gdk_drawable_get_size(window, &ww, &wh);
 339         if (!tree_view_get_cell_origin(widget, tpath, column, text_cell_only, x,  y, width, height))
 340                 {
 341                 *x = wx;
 342                 *y = wy;
 343                 *width = ww;
 344                 *height = wh;
 345                 return;
 346                 }
 347
 348         *width = MIN(*width, ww);
 349         *x = CLAMP(*x, wx, wx + ww - (*width));
 350         *y = CLAMP(*y, wy, wy + wh);
 351         *height = MIN(*height, wy + wh - (*y));
 352 }
 353
 354 #if GTK_CHECK_VERSION(2,8,0)
 355 /* an implementation that uses gtk_tree_view_get_visible_range */
 356 gint tree_view_row_get_visibility(GtkTreeView *widget, GtkTreeIter *iter, gboolean fully_visible)
 357 {
 358         GtkTreeModel *store;
 359         GtkTreePath *tpath, *start_path, *end_path;
 360         gint ret = 0;
 361
 362         if (!gtk_tree_view_get_visible_range(widget, &start_path, &end_path)) return -1; /* we will most probably scroll down, needed for tree_view_row_make_visible */
 363
 364         store = gtk_tree_view_get_model(widget);
 365         tpath = gtk_tree_model_get_path(store, iter);
 366
 367         if (fully_visible)
 368                 {
 369                 if (gtk_tree_path_compare(tpath, start_path) <= 0)
 370                         {
 371                         ret = -1;
 372                         }
 373                 else if (gtk_tree_path_compare(tpath, end_path) >= 0)
 374                         {
 375                         ret = 1;
 376                         }
 377                 }
 378         else
 379                 {
 380                 if (gtk_tree_path_compare(tpath, start_path) < 0)
 381                         {
 382                         ret = -1;
 383                         }
 384                 else if (gtk_tree_path_compare(tpath, end_path) > 0)
 385                         {
 386                         ret = 1;
 387                         }
 388                 }
 389
 390         gtk_tree_path_free(tpath);
 391         gtk_tree_path_free(start_path);
 392         gtk_tree_path_free(end_path);
 393         return ret;
 394 }
 395
 396 #else
 397 /* an implementation that uses gtk_tree_view_get_visible_rect, it seems to be more error prone than the variant above */
 398
 399 gint tree_view_row_get_visibility(GtkTreeView *widget, GtkTreeIter *iter, gboolean fully_visible)
 400 {
 401         GtkTreeModel *store;
 402         GtkTreePath *tpath;
 403         gint cx, cy;
 404
 405         GdkRectangle vrect;
 406         GdkRectangle crect;
 407
 408         if (!GTK_WIDGET_REALIZED(GTK_WIDGET(widget))) return -1; /* we will most probably scroll down, needed for tree_view_row_make_visible */
 409
 410         store = gtk_tree_view_get_model(widget);
 411         tpath = gtk_tree_model_get_path(store, iter);
 412
 413         gtk_tree_view_get_visible_rect(widget, &vrect);
 414         gtk_tree_view_get_cell_area(widget, tpath, NULL, &crect);
 415         gtk_tree_path_free(tpath);
 416
 417
 418 #if GTK_CHECK_VERSION(2,12,0)
 419         gtk_tree_view_convert_widget_to_tree_coords(widget, crect.x, crect.y, &cx, &cy);
 420 #else
 421         gtk_tree_view_widget_to_tree_coords(widget, crect.x, crect.y, &cx, &cy);
 422 #endif
 423
 424         if (fully_visible)
 425                 {
 426                 if (cy < vrect.y) return -1;
 427                 if (cy + crect.height > vrect.y + vrect.height) return 1;
 428                 return 0;
 429                 }
 430
 431         if (cy + crect.height < vrect.y) return -1;
 432         if (cy > vrect.y + vrect.height) return 1;
 433         return 0;
 434 }
 435 #endif
 436
 437 gint tree_view_row_make_visible(GtkTreeView *widget, GtkTreeIter *iter, gboolean center)
 438 {
 439         GtkTreePath *tpath;
 440         gint vis;
 441
 442         vis = tree_view_row_get_visibility(widget, iter, TRUE);
 443
 444         tpath = gtk_tree_model_get_path(gtk_tree_view_get_model(widget), iter);
 445         if (center && vis != 0)
 446                 {
 447                 gtk_tree_view_scroll_to_cell(widget, tpath, NULL, TRUE, 0.5, 0.0);
 448                 }
 449         else if (vis < 0)
 450                 {
 451                 gtk_tree_view_scroll_to_cell(widget, tpath, NULL, TRUE, 0.0, 0.0);
 452                 }
 453         else if (vis > 0)
 454                 {
 455                 gtk_tree_view_scroll_to_cell(widget, tpath, NULL, TRUE, 1.0, 0.0);
 456                 }
 457         gtk_tree_path_free(tpath);
 458
 459         return vis;
 460 }
 461
 462 gboolean tree_view_move_cursor_away(GtkTreeView *widget, GtkTreeIter *iter, gboolean only_selected)
 463 {
 464         GtkTreeModel *store;
 465         GtkTreePath *tpath;
 466         GtkTreePath *fpath;
 467         gboolean move = FALSE;
 468
 469         if (!iter) return FALSE;
 470
 471         store = gtk_tree_view_get_model(widget);
 472         tpath = gtk_tree_model_get_path(store, iter);
 473         gtk_tree_view_get_cursor(widget, &fpath, NULL);
 474
 475         if (fpath && gtk_tree_path_compare(tpath, fpath) == 0)
 476                 {
 477                 GtkTreeSelection *selection;
 478
 479                 selection = gtk_tree_view_get_selection(widget);
 480
 481                 if (!only_selected ||
 482                     gtk_tree_selection_path_is_selected(selection, tpath))
 483                         {
 484                         GtkTreeIter current;
 485
 486                         current = *iter;
 487                         if (gtk_tree_model_iter_next(store, &current))
 488                                 {
 489                                 gtk_tree_path_next(tpath);
 490                                 move = TRUE;
 491                                 }
 492                         else if (gtk_tree_path_prev(tpath) &&
 493                                  gtk_tree_model_get_iter(store, &current, tpath))
 494                                 {
 495                                 move = TRUE;
 496                                 }
 497
 498                         if (move)
 499                                 {
 500                                 gtk_tree_view_set_cursor(widget, tpath, NULL, FALSE);
 501                                 }
 502                         }
 503                 }
 504
 505         gtk_tree_path_free(tpath);
 506         if (fpath) gtk_tree_path_free(fpath);
 507
 508         return move;
 509 }
 510
 511 gint tree_path_to_row(GtkTreePath *tpath)
 512 {
 513         gint *indices;
 514
 515         indices = gtk_tree_path_get_indices(tpath);
 516         if (indices) return indices[0];
 517
 518         return -1;
 519 }
 520
 521
 522 /*
 523  *-------------------------------------------------------------------
 524  * color utilities
 525  *-------------------------------------------------------------------
 526  */
 527
 528 void shift_color(GdkColor *src, gshort val, gint direction)
 529 {
 530         gshort cs;
 531
 532         if (val == -1)
 533                 {
 534                 val = STYLE_SHIFT_STANDARD;
 535                 }
 536         else
 537                 {
 538                 val = CLAMP(val, 1, 100);
 539                 }
 540         cs = 0xffff / 100 * val;
 541
 542         /* up or down ? */
 543         if (direction < 0 ||
 544             (direction == 0 &&((gint)src->red + (gint)src->green + (gint)src->blue) / 3 > 0xffff / 2))
 545                 {
 546                 src->red = MAX(0 , src->red - cs);
 547                 src->green = MAX(0 , src->green - cs);
 548                 src->blue = MAX(0 , src->blue - cs);
 549                 }
 550         else
 551                 {
 552                 src->red = MIN(0xffff, src->red + cs);
 553                 src->green = MIN(0xffff, src->green + cs);
 554                 src->blue = MIN(0xffff, src->blue + cs);
 555                 }
 556 }
 557
 558 /* darkens or lightens a style's color for given state
 559  * esp. useful for alternating dark/light in (c)lists
 560  */
 561 void style_shift_color(GtkStyle *style, GtkStateType type, gshort shift_value, gint direction)
 562 {
 563         if (!style) return;
 564
 565         shift_color(&style->base[type], shift_value, direction);
 566         shift_color(&style->bg[type], shift_value, direction);
 567 }
 568
 569 /*
 570  *-------------------------------------------------------------------
 571  * auto scroll by mouse position
 572  *-------------------------------------------------------------------
 573  */
 574
 575 #define AUTO_SCROLL_DEFAULT_SPEED 100
 576 #define AUTO_SCROLL_DEFAULT_REGION 20
 577
 578 typedef struct _AutoScrollData AutoScrollData;
 579 struct _AutoScrollData
 580 {
 581         guint timer_id; /* event source id */
 582         gint region_size;
 583         GtkWidget *widget;
 584         GtkAdjustment *adj;
 585         gint max_step;
 586
 587         gint (*notify_func)(GtkWidget *, gint, gint, gpointer);
 588         gpointer notify_data;
 589 };
 590
 591 void widget_auto_scroll_stop(GtkWidget *widget)
 592 {
 593         AutoScrollData *sd;
 594
 595         sd = g_object_get_data(G_OBJECT(widget), "autoscroll");
 596         if (!sd) return;
 597         g_object_set_data(G_OBJECT(widget), "autoscroll", NULL);
 598
 599         if (sd->timer_id) g_source_remove(sd->timer_id);
 600         g_free(sd);
 601 }
 602
 603 static gboolean widget_auto_scroll_cb(gpointer data)
 604 {
 605         AutoScrollData *sd = data;
 606         GdkWindow *window;
 607         gint x, y;
 608         gint w, h;
 609         gint amt = 0;
 610
 611         if (sd->max_step < sd->region_size)
 612                 {
 613                 sd->max_step = MIN(sd->region_size, sd->max_step + 2);
 614                 }
 615
 616         window = sd->widget->window;
 617         gdk_window_get_pointer(window, &x, &y, NULL);
 618         gdk_drawable_get_size(window, &w, &h);
 619
 620         if (x < 0 || x >= w || y < 0 || y >= h)
 621                 {
 622                 sd->timer_id = 0;
 623                 widget_auto_scroll_stop(sd->widget);
 624                 return FALSE;
 625                 }
 626
 627         if (h < sd->region_size * 3)
 628                 {
 629                 /* height is cramped, nicely divide into three equal regions */
 630                 if (y < h / 3 || y > h / 3 * 2)
 631                         {
 632                         amt = (y < h / 2) ? 0 - ((h / 2) - y) : y - (h / 2);
 633                         }
 634                 }
 635         else if (y < sd->region_size)
 636                 {
 637                 amt = 0 - (sd->region_size - y);
 638                 }
 639         else if (y >= h - sd->region_size)
 640                 {
 641                 amt = y - (h - sd->region_size);
 642                 }
 643
 644         if (amt != 0)
 645                 {
 646                 amt = CLAMP(amt, 0 - sd->max_step, sd->max_step);
 647
 648                 if (sd->adj->value != CLAMP(sd->adj->value + amt, sd->adj->lower, sd->adj->upper - sd->adj->page_size))
 649                         {
 650                         /* only notify when scrolling is needed */
 651                         if (sd->notify_func && !sd->notify_func(sd->widget, x, y, sd->notify_data))
 652                                 {
 653                                 sd->timer_id = 0;
 654                                 widget_auto_scroll_stop(sd->widget);
 655                                 return FALSE;
 656                                 }
 657
 658                         gtk_adjustment_set_value(sd->adj,
 659                                 CLAMP(sd->adj->value + amt, sd->adj->lower, sd->adj->upper - sd->adj->page_size));
 660                         }
 661                 }
 662
 663         return TRUE;
 664 }
 665
 666 gint widget_auto_scroll_start(GtkWidget *widget, GtkAdjustment *v_adj, gint scroll_speed, gint region_size,
 667                               gint (*notify_func)(GtkWidget *widget, gint x, gint y, gpointer data), gpointer notify_data)
 668 {
 669         AutoScrollData *sd;
 670
 671         if (!widget || !v_adj) return 0;
 672         if (g_object_get_data(G_OBJECT(widget), "autoscroll")) return 0;
 673         if (scroll_speed < 1) scroll_speed = AUTO_SCROLL_DEFAULT_SPEED;
 674         if (region_size < 1) region_size = AUTO_SCROLL_DEFAULT_REGION;
 675
 676         sd = g_new0(AutoScrollData, 1);
 677         sd->widget = widget;
 678         sd->adj = v_adj;
 679         sd->region_size = region_size;
 680         sd->max_step = 1;
 681         sd->timer_id = g_timeout_add(scroll_speed, widget_auto_scroll_cb, sd);
 682
 683         sd->notify_func = notify_func;
 684         sd->notify_data = notify_data;
 685
 686         g_object_set_data(G_OBJECT(widget), "autoscroll", sd);
 687
 688         return scroll_speed;
 689 }
 690
 691
 692 /*
 693  *-------------------------------------------------------------------
 694  * GList utils
 695  *-------------------------------------------------------------------
 696  */
 697
 698 GList *uig_list_insert_link(GList *list, GList *link, gpointer data)
 699 {
 700         GList *new_list;
 701
 702         if (!list || link == list) return g_list_prepend(list, data);
 703         if (!link) return g_list_append(list, data);
 704
 705         new_list = g_list_alloc();
 706         new_list->data = data;
 707
 708         if (link->prev)
 709                 {
 710                 link->prev->next = new_list;
 711                 new_list->prev = link->prev;
 712                 }
 713         else
 714                 {
 715                 list = new_list;
 716                 }
 717         link->prev = new_list;
 718         new_list->next = link;
 719
 720         return list;
 721 }
 722
 723 GList *uig_list_insert_list(GList *parent, GList *insert_link, GList *list)
 724 {
 725         GList *end;
 726
 727         if (!insert_link) return g_list_concat(parent, list);
 728         if (insert_link == parent) return g_list_concat(list, parent);
 729         if (!parent) return list;
 730         if (!list) return parent;
 731
 732         end  = g_list_last(list);
 733
 734         if (insert_link->prev) insert_link->prev->next = list;
 735         list->prev = insert_link->prev;
 736         insert_link->prev = end;
 737         end->next = insert_link;
 738
 739         return parent;
 740 }
 741 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */