src/ui_tree_edit.c

   1 /*
   2  * (SLIK) SimpLIstic sKin functions
   3  * (C) 2004 John Ellis
   4  * Copyright (C) 2008 - 2012 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         GdkWindow *window = gtk_widget_get_window(ted->window);
  78
  79         gint x, y;
  80         gint w, h;
  81
  82         gint xr, yr;
  83
  84         xr = (gint)event->x_root;
  85         yr = (gint)event->y_root;
  86
  87         gdk_window_get_origin(window, &x, &y);
  88         w = gdk_window_get_width(window);
  89         h = gdk_window_get_height(window);
  90
  91         if (xr < x || yr < y || xr > x + w || yr > y + h)
  92                 {
  93                 /* gobble the release event, so it does not propgate to an underlying widget */
  94                 g_signal_connect(G_OBJECT(ted->window), "button_release_event",
  95                                  G_CALLBACK(tree_edit_click_end_cb), ted);
  96                 return TRUE;
  97                 }
  98         return FALSE;
  99 }
 100
 101 static gboolean tree_edit_key_press_cb(GtkWidget *widget, GdkEventKey *event, gpointer data)
 102 {
 103         TreeEditData *ted = data;
 104
 105         switch (event->keyval)
 106                 {
 107                 case GDK_Return:
 108                 case GDK_KP_Enter:
 109                 case GDK_Tab:           /* ok, we are going to intercept the focus change
 110                                            from keyboard and act like return was hit */
 111                 case GDK_ISO_Left_Tab:
 112                 case GDK_Up:
 113                 case GDK_Down:
 114                 case GDK_KP_Up:
 115                 case GDK_KP_Down:
 116                 case GDK_KP_Left:
 117                 case GDK_KP_Right:
 118                         tree_edit_do(ted);
 119                         tree_edit_close(ted);
 120                         break;
 121                 case GDK_Escape:
 122                         tree_edit_close(ted);
 123                         break;
 124                 default:
 125                         break;
 126                 }
 127
 128         return FALSE;
 129 }
 130
 131 static gboolean tree_edit_by_path_idle_cb(gpointer data)
 132 {
 133         TreeEditData *ted = data;
 134         GdkRectangle rect;
 135         gint x, y, w, h;        /* geometry of cell within tree */
 136         gint wx, wy;            /* geometry of tree from root window */
 137         gint sx, sw;
 138
 139         gtk_tree_view_get_cell_area(ted->tree, ted->path, ted->column, &rect);
 140
 141         x = rect.x;
 142         y = rect.y;
 143         w = rect.width + 4;
 144         h = rect.height + 4;
 145
 146         if (gtk_tree_view_column_cell_get_position(ted->column, ted->cell, &sx, &sw))
 147                 {
 148                 x += sx;
 149                 w = MAX(w - sx, sw);
 150                 }
 151
 152         gdk_window_get_origin(gtk_tree_view_get_bin_window(ted->tree), &wx, &wy);
 153
 154         x += wx - 2; /* the -val is to 'fix' alignment of entry position */
 155         y += wy - 2;
 156
 157         /* now show it */
 158         gtk_widget_set_size_request(ted->window, w, h);
 159         gtk_widget_realize(ted->window);
 160         gtk_window_move(GTK_WINDOW(ted->window), x, y);
 161         gtk_window_resize(GTK_WINDOW(ted->window), w, h);
 162         gtk_widget_show(ted->window);
 163
 164         /* grab it */
 165         gtk_widget_grab_focus(ted->entry);
 166         /* explicitely set the focus flag for the entry, for some reason on popup windows this
 167          * is not set, and causes no edit cursor to appear ( popups not allowed focus? )
 168          */
 169         gtk_widget_grab_focus(ted->entry);
 170         gtk_grab_add(ted->window);
 171         gdk_pointer_grab(gtk_widget_get_window(ted->window), TRUE,
 172                          GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK | GDK_BUTTON_MOTION_MASK,
 173                          NULL, NULL, GDK_CURRENT_TIME);
 174         gdk_keyboard_grab(gtk_widget_get_window(ted->window), TRUE, GDK_CURRENT_TIME);
 175
 176         return FALSE;
 177 }
 178
 179 gboolean tree_edit_by_path(GtkTreeView *tree, GtkTreePath *tpath, gint column, const gchar *text,
 180                            gboolean (*edit_func)(TreeEditData *, const gchar *, const gchar *, gpointer), gpointer data)
 181 {
 182         TreeEditData *ted;
 183         GtkTreeViewColumn *tcolumn;
 184         GtkCellRenderer *cell = NULL;
 185         GList *list;
 186         GList *work;
 187
 188         if (!edit_func) return FALSE;
 189 #if GTK_CHECK_VERSION(2,20,0)
 190         if (!gtk_widget_get_visible(GTK_WIDGET(tree))) return FALSE;
 191 #else
 192         if (!GTK_WIDGET_VISIBLE(tree)) return FALSE;
 193 #endif
 194
 195         tcolumn = gtk_tree_view_get_column(tree, column);
 196         if (!tcolumn) return FALSE;
 197
 198 #if GTK_CHECK_VERSION(2,18,0)
 199         list = gtk_cell_layout_get_cells(GTK_CELL_LAYOUT(tcolumn));
 200 #else
 201         list = gtk_tree_view_column_get_cell_renderers(tcolumn);
 202 #endif
 203         work = list;
 204         while (work && !cell)
 205                 {
 206                 cell = work->data;
 207                 if (!GTK_IS_CELL_RENDERER_TEXT(cell))
 208                         {
 209                         cell = NULL;
 210                         }
 211                 work = work->next;
 212                 }
 213
 214         g_list_free(list);
 215         if (!cell) return FALSE;
 216
 217         if (!text) text = "";
 218
 219         ted = g_new0(TreeEditData, 1);
 220
 221         ted->old_name = g_strdup(text);
 222
 223         ted->edit_func = edit_func;
 224         ted->edit_data = data;
 225
 226         ted->tree = tree;
 227         ted->path = gtk_tree_path_copy(tpath);
 228         ted->column = tcolumn;
 229         ted->cell = cell;
 230
 231         gtk_tree_view_scroll_to_cell(ted->tree, ted->path, ted->column, FALSE, 0.0, 0.0);
 232
 233         /* create the window */
 234
 235         ted->window = gtk_window_new(GTK_WINDOW_POPUP);
 236         gtk_window_set_resizable(GTK_WINDOW(ted->window), FALSE);
 237         g_signal_connect(G_OBJECT(ted->window), "button_press_event",
 238                          G_CALLBACK(tree_edit_click_cb), ted);
 239         g_signal_connect(G_OBJECT(ted->window), "key_press_event",
 240                          G_CALLBACK(tree_edit_key_press_cb), ted);
 241
 242         ted->entry = gtk_entry_new();
 243         gtk_entry_set_text(GTK_ENTRY(ted->entry), ted->old_name);
 244         gtk_editable_select_region(GTK_EDITABLE(ted->entry), 0, strlen(ted->old_name));
 245         gtk_container_add(GTK_CONTAINER(ted->window), ted->entry);
 246         gtk_widget_show(ted->entry);
 247
 248         /* due to the fact that gtktreeview scrolls in an idle loop, we cannot
 249          * reliably get the cell position until those scroll priority signals are processed
 250          */
 251         g_idle_add_full(G_PRIORITY_DEFAULT_IDLE - 2, tree_edit_by_path_idle_cb, ted, NULL);
 252
 253         return TRUE;
 254 }
 255
 256 /*
 257  *-------------------------------------------------------------------
 258  * tree cell position retrieval
 259  *-------------------------------------------------------------------
 260  */
 261
 262 gboolean tree_view_get_cell_origin(GtkTreeView *widget, GtkTreePath *tpath, gint column, gboolean text_cell_only,
 263                                    gint *x, gint *y, gint *width, gint *height)
 264 {
 265         gint x_origin, y_origin;
 266         gint x_offset, y_offset;
 267         gint header_size;
 268         GtkTreeViewColumn *tv_column;
 269         GdkRectangle rect;
 270
 271         tv_column = gtk_tree_view_get_column(widget, column);
 272         if (!tv_column || !tpath) return FALSE;
 273
 274         /* hmm, appears the rect will not account for X scroll, but does for Y scroll
 275          * use x_offset instead for X scroll (sigh)
 276          */
 277         gtk_tree_view_get_cell_area(widget, tpath, tv_column, &rect);
 278 #if GTK_CHECK_VERSION(2,12,0)
 279         gtk_tree_view_convert_tree_to_widget_coords(widget, 0, 0, &x_offset, &y_offset);
 280 #else
 281         gtk_tree_view_tree_to_widget_coords(widget, 0, 0, &x_offset, &y_offset);
 282 #endif
 283         gdk_window_get_origin(gtk_widget_get_window(GTK_WIDGET(widget)), &x_origin, &y_origin);
 284
 285         if (gtk_tree_view_get_headers_visible(widget))
 286                 {
 287                 GtkAllocation allocation;
 288 #if GTK_CHECK_VERSION(3,0,0)
 289                 gtk_widget_get_allocation(gtk_tree_view_column_get_button(tv_column), &allocation);
 290 #else
 291                 gtk_widget_get_allocation(tv_column->button, &allocation);
 292 #endif
 293                 header_size = allocation.height;
 294                 }
 295         else
 296                 {
 297                 header_size = 0;
 298                 }
 299
 300         if (text_cell_only)
 301                 {
 302                 GtkCellRenderer *cell = NULL;
 303                 GList *renderers;
 304                 GList *work;
 305                 gint cell_x;
 306                 gint cell_width;
 307
 308 #if GTK_CHECK_VERSION(2,18,0)
 309                 renderers = gtk_cell_layout_get_cells(GTK_CELL_LAYOUT(tv_column));
 310 #else
 311                 renderers = gtk_tree_view_column_get_cell_renderers(tv_column);
 312 #endif
 313                 work = renderers;
 314                 while (work && !cell)
 315                         {
 316                         cell = work->data;
 317                         work = work->next;
 318                         if (!GTK_IS_CELL_RENDERER_TEXT(cell)) cell = NULL;
 319                         }
 320                 g_list_free(renderers);
 321
 322                 if (!cell) return FALSE;
 323
 324                 if (!gtk_tree_view_column_cell_get_position(tv_column, cell, &cell_x, &cell_width))
 325                         {
 326                         cell_x = 0;
 327                         cell_width = rect.width;
 328                         }
 329                 *x = x_origin + x_offset + rect.x + cell_x;
 330                 *width = cell_width;
 331                 }
 332         else
 333                 {
 334                 *x = x_origin + x_offset + rect.x;
 335                 *width = rect.width;
 336                 }
 337         *y = y_origin + rect.y + header_size;
 338         *height = rect.height;
 339         return TRUE;
 340 }
 341
 342 void tree_view_get_cell_clamped(GtkTreeView *widget, GtkTreePath *tpath, gint column, gboolean text_cell_only,
 343                                 gint *x, gint *y, gint *width, gint *height)
 344 {
 345         gint wx, wy, ww, wh;
 346         GdkWindow *window;
 347
 348         window = gtk_widget_get_window(GTK_WIDGET(widget));
 349         gdk_window_get_origin(window, &wx, &wy);
 350
 351         ww = gdk_window_get_width(window);
 352         wh = gdk_window_get_height(window);
 353
 354         if (!tree_view_get_cell_origin(widget, tpath, column, text_cell_only, x,  y, width, height))
 355                 {
 356                 *x = wx;
 357                 *y = wy;
 358                 *width = ww;
 359                 *height = wh;
 360                 return;
 361                 }
 362
 363         *width = MIN(*width, ww);
 364         *x = CLAMP(*x, wx, wx + ww - (*width));
 365         *y = CLAMP(*y, wy, wy + wh);
 366         *height = MIN(*height, wy + wh - (*y));
 367 }
 368
 369 #if GTK_CHECK_VERSION(2,8,0)
 370 /* an implementation that uses gtk_tree_view_get_visible_range */
 371 gint tree_view_row_get_visibility(GtkTreeView *widget, GtkTreeIter *iter, gboolean fully_visible)
 372 {
 373         GtkTreeModel *store;
 374         GtkTreePath *tpath, *start_path, *end_path;
 375         gint ret = 0;
 376
 377         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 */
 378
 379         store = gtk_tree_view_get_model(widget);
 380         tpath = gtk_tree_model_get_path(store, iter);
 381
 382         if (fully_visible)
 383                 {
 384                 if (gtk_tree_path_compare(tpath, start_path) <= 0)
 385                         {
 386                         ret = -1;
 387                         }
 388                 else if (gtk_tree_path_compare(tpath, end_path) >= 0)
 389                         {
 390                         ret = 1;
 391                         }
 392                 }
 393         else
 394                 {
 395                 if (gtk_tree_path_compare(tpath, start_path) < 0)
 396                         {
 397                         ret = -1;
 398                         }
 399                 else if (gtk_tree_path_compare(tpath, end_path) > 0)
 400                         {
 401                         ret = 1;
 402                         }
 403                 }
 404
 405         gtk_tree_path_free(tpath);
 406         gtk_tree_path_free(start_path);
 407         gtk_tree_path_free(end_path);
 408         return ret;
 409 }
 410
 411 #else
 412 /* an implementation that uses gtk_tree_view_get_visible_rect, it seems to be more error prone than the variant above */
 413
 414 gint tree_view_row_get_visibility(GtkTreeView *widget, GtkTreeIter *iter, gboolean fully_visible)
 415 {
 416         GtkTreeModel *store;
 417         GtkTreePath *tpath;
 418         gint cx, cy;
 419
 420         GdkRectangle vrect;
 421         GdkRectangle crect;
 422
 423         if (!GTK_WIDGET_REALIZED(GTK_WIDGET(widget))) return -1; /* we will most probably scroll down, needed for tree_view_row_make_visible */
 424
 425         store = gtk_tree_view_get_model(widget);
 426         tpath = gtk_tree_model_get_path(store, iter);
 427
 428         gtk_tree_view_get_visible_rect(widget, &vrect);
 429         gtk_tree_view_get_cell_area(widget, tpath, NULL, &crect);
 430         gtk_tree_path_free(tpath);
 431
 432
 433 #if GTK_CHECK_VERSION(2,12,0)
 434         gtk_tree_view_convert_widget_to_tree_coords(widget, crect.x, crect.y, &cx, &cy);
 435 #else
 436         gtk_tree_view_widget_to_tree_coords(widget, crect.x, crect.y, &cx, &cy);
 437 #endif
 438
 439         if (fully_visible)
 440                 {
 441                 if (cy < vrect.y) return -1;
 442                 if (cy + crect.height > vrect.y + vrect.height) return 1;
 443                 return 0;
 444                 }
 445
 446         if (cy + crect.height < vrect.y) return -1;
 447         if (cy > vrect.y + vrect.height) return 1;
 448         return 0;
 449 }
 450 #endif
 451
 452 gint tree_view_row_make_visible(GtkTreeView *widget, GtkTreeIter *iter, gboolean center)
 453 {
 454         GtkTreePath *tpath;
 455         gint vis;
 456
 457         vis = tree_view_row_get_visibility(widget, iter, TRUE);
 458
 459         tpath = gtk_tree_model_get_path(gtk_tree_view_get_model(widget), iter);
 460         if (center && vis != 0)
 461                 {
 462                 gtk_tree_view_scroll_to_cell(widget, tpath, NULL, TRUE, 0.5, 0.0);
 463                 }
 464         else if (vis < 0)
 465                 {
 466                 gtk_tree_view_scroll_to_cell(widget, tpath, NULL, TRUE, 0.0, 0.0);
 467                 }
 468         else if (vis > 0)
 469                 {
 470                 gtk_tree_view_scroll_to_cell(widget, tpath, NULL, TRUE, 1.0, 0.0);
 471                 }
 472         gtk_tree_path_free(tpath);
 473
 474         return vis;
 475 }
 476
 477 gboolean tree_view_move_cursor_away(GtkTreeView *widget, GtkTreeIter *iter, gboolean only_selected)
 478 {
 479         GtkTreeModel *store;
 480         GtkTreePath *tpath;
 481         GtkTreePath *fpath;
 482         gboolean move = FALSE;
 483
 484         if (!iter) return FALSE;
 485
 486         store = gtk_tree_view_get_model(widget);
 487         tpath = gtk_tree_model_get_path(store, iter);
 488         gtk_tree_view_get_cursor(widget, &fpath, NULL);
 489
 490         if (fpath && gtk_tree_path_compare(tpath, fpath) == 0)
 491                 {
 492                 GtkTreeSelection *selection;
 493
 494                 selection = gtk_tree_view_get_selection(widget);
 495
 496                 if (!only_selected ||
 497                     gtk_tree_selection_path_is_selected(selection, tpath))
 498                         {
 499                         GtkTreeIter current;
 500
 501                         current = *iter;
 502                         if (gtk_tree_model_iter_next(store, &current))
 503                                 {
 504                                 gtk_tree_path_next(tpath);
 505                                 move = TRUE;
 506                                 }
 507                         else if (gtk_tree_path_prev(tpath) &&
 508                                  gtk_tree_model_get_iter(store, &current, tpath))
 509                                 {
 510                                 move = TRUE;
 511                                 }
 512
 513                         if (move)
 514                                 {
 515                                 gtk_tree_view_set_cursor(widget, tpath, NULL, FALSE);
 516                                 }
 517                         }
 518                 }
 519
 520         gtk_tree_path_free(tpath);
 521         if (fpath) gtk_tree_path_free(fpath);
 522
 523         return move;
 524 }
 525
 526 gint tree_path_to_row(GtkTreePath *tpath)
 527 {
 528         gint *indices;
 529
 530         indices = gtk_tree_path_get_indices(tpath);
 531         if (indices) return indices[0];
 532
 533         return -1;
 534 }
 535
 536
 537 /*
 538  *-------------------------------------------------------------------
 539  * color utilities
 540  *-------------------------------------------------------------------
 541  */
 542
 543 void shift_color(GdkColor *src, gshort val, gint direction)
 544 {
 545         gshort cs;
 546
 547         if (val == -1)
 548                 {
 549                 val = STYLE_SHIFT_STANDARD;
 550                 }
 551         else
 552                 {
 553                 val = CLAMP(val, 1, 100);
 554                 }
 555         cs = 0xffff / 100 * val;
 556
 557         /* up or down ? */
 558         if (direction < 0 ||
 559             (direction == 0 &&((gint)src->red + (gint)src->green + (gint)src->blue) / 3 > 0xffff / 2))
 560                 {
 561                 src->red = MAX(0 , src->red - cs);
 562                 src->green = MAX(0 , src->green - cs);
 563                 src->blue = MAX(0 , src->blue - cs);
 564                 }
 565         else
 566                 {
 567                 src->red = MIN(0xffff, src->red + cs);
 568                 src->green = MIN(0xffff, src->green + cs);
 569                 src->blue = MIN(0xffff, src->blue + cs);
 570                 }
 571 }
 572
 573 /* darkens or lightens a style's color for given state
 574  * esp. useful for alternating dark/light in (c)lists
 575  */
 576 void style_shift_color(GtkStyle *style, GtkStateType type, gshort shift_value, gint direction)
 577 {
 578         if (!style) return;
 579
 580         shift_color(&style->base[type], shift_value, direction);
 581         shift_color(&style->bg[type], shift_value, direction);
 582 }
 583
 584 /*
 585  *-------------------------------------------------------------------
 586  * auto scroll by mouse position
 587  *-------------------------------------------------------------------
 588  */
 589
 590 #define AUTO_SCROLL_DEFAULT_SPEED 100
 591 #define AUTO_SCROLL_DEFAULT_REGION 20
 592
 593 typedef struct _AutoScrollData AutoScrollData;
 594 struct _AutoScrollData
 595 {
 596         guint timer_id; /* event source id */
 597         gint region_size;
 598         GtkWidget *widget;
 599         GtkAdjustment *adj;
 600         gint max_step;
 601
 602         gint (*notify_func)(GtkWidget *, gint, gint, gpointer);
 603         gpointer notify_data;
 604 };
 605
 606 void widget_auto_scroll_stop(GtkWidget *widget)
 607 {
 608         AutoScrollData *sd;
 609
 610         sd = g_object_get_data(G_OBJECT(widget), "autoscroll");
 611         if (!sd) return;
 612         g_object_set_data(G_OBJECT(widget), "autoscroll", NULL);
 613
 614         if (sd->timer_id) g_source_remove(sd->timer_id);
 615         g_free(sd);
 616 }
 617
 618 static gboolean widget_auto_scroll_cb(gpointer data)
 619 {
 620         AutoScrollData *sd = data;
 621         GdkWindow *window;
 622         gint x, y;
 623         gint w, h;
 624         gint amt = 0;
 625
 626         if (sd->max_step < sd->region_size)
 627                 {
 628                 sd->max_step = MIN(sd->region_size, sd->max_step + 2);
 629                 }
 630
 631         window = gtk_widget_get_window(sd->widget);
 632         gdk_window_get_pointer(window, &x, &y, NULL);
 633         w = gdk_window_get_width(window);
 634         h = gdk_window_get_height(window);
 635
 636         if (x < 0 || x >= w || y < 0 || y >= h)
 637                 {
 638                 sd->timer_id = 0;
 639                 widget_auto_scroll_stop(sd->widget);
 640                 return FALSE;
 641                 }
 642
 643         if (h < sd->region_size * 3)
 644                 {
 645                 /* height is cramped, nicely divide into three equal regions */
 646                 if (y < h / 3 || y > h / 3 * 2)
 647                         {
 648                         amt = (y < h / 2) ? 0 - ((h / 2) - y) : y - (h / 2);
 649                         }
 650                 }
 651         else if (y < sd->region_size)
 652                 {
 653                 amt = 0 - (sd->region_size - y);
 654                 }
 655         else if (y >= h - sd->region_size)
 656                 {
 657                 amt = y - (h - sd->region_size);
 658                 }
 659
 660         if (amt != 0)
 661                 {
 662                 amt = CLAMP(amt, 0 - sd->max_step, sd->max_step);
 663
 664                 if (gtk_adjustment_get_value(sd->adj) != CLAMP(gtk_adjustment_get_value(sd->adj) + amt, gtk_adjustment_get_lower(sd->adj), gtk_adjustment_get_upper(sd->adj) - gtk_adjustment_get_page_size(sd->adj)))
 665                         {
 666                         /* only notify when scrolling is needed */
 667                         if (sd->notify_func && !sd->notify_func(sd->widget, x, y, sd->notify_data))
 668                                 {
 669                                 sd->timer_id = 0;
 670                                 widget_auto_scroll_stop(sd->widget);
 671                                 return FALSE;
 672                                 }
 673
 674                         gtk_adjustment_set_value(sd->adj,
 675                                 CLAMP(gtk_adjustment_get_value(sd->adj) + amt, gtk_adjustment_get_lower(sd->adj), gtk_adjustment_get_upper(sd->adj) - gtk_adjustment_get_page_size(sd->adj)));
 676                         }
 677                 }
 678
 679         return TRUE;
 680 }
 681
 682 gint widget_auto_scroll_start(GtkWidget *widget, GtkAdjustment *v_adj, gint scroll_speed, gint region_size,
 683                               gint (*notify_func)(GtkWidget *widget, gint x, gint y, gpointer data), gpointer notify_data)
 684 {
 685         AutoScrollData *sd;
 686
 687         if (!widget || !v_adj) return 0;
 688         if (g_object_get_data(G_OBJECT(widget), "autoscroll")) return 0;
 689         if (scroll_speed < 1) scroll_speed = AUTO_SCROLL_DEFAULT_SPEED;
 690         if (region_size < 1) region_size = AUTO_SCROLL_DEFAULT_REGION;
 691
 692         sd = g_new0(AutoScrollData, 1);
 693         sd->widget = widget;
 694         sd->adj = v_adj;
 695         sd->region_size = region_size;
 696         sd->max_step = 1;
 697         sd->timer_id = g_timeout_add(scroll_speed, widget_auto_scroll_cb, sd);
 698
 699         sd->notify_func = notify_func;
 700         sd->notify_data = notify_data;
 701
 702         g_object_set_data(G_OBJECT(widget), "autoscroll", sd);
 703
 704         return scroll_speed;
 705 }
 706
 707
 708 /*
 709  *-------------------------------------------------------------------
 710  * GList utils
 711  *-------------------------------------------------------------------
 712  */
 713
 714 GList *uig_list_insert_link(GList *list, GList *link, gpointer data)
 715 {
 716         GList *new_list;
 717
 718         if (!list || link == list) return g_list_prepend(list, data);
 719         if (!link) return g_list_append(list, data);
 720
 721         new_list = g_list_alloc();
 722         new_list->data = data;
 723
 724         if (link->prev)
 725                 {
 726                 link->prev->next = new_list;
 727                 new_list->prev = link->prev;
 728                 }
 729         else
 730                 {
 731                 list = new_list;
 732                 }
 733         link->prev = new_list;
 734         new_list->next = link;
 735
 736         return list;
 737 }
 738
 739 GList *uig_list_insert_list(GList *parent, GList *insert_link, GList *list)
 740 {
 741         GList *end;
 742
 743         if (!insert_link) return g_list_concat(parent, list);
 744         if (insert_link == parent) return g_list_concat(list, parent);
 745         if (!parent) return list;
 746         if (!list) return parent;
 747
 748         end  = g_list_last(list);
 749
 750         if (insert_link->prev) insert_link->prev->next = list;
 751         list->prev = insert_link->prev;
 752         insert_link->prev = end;
 753         end->next = insert_link;
 754
 755         return parent;
 756 }
 757 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */