src/gtkticker.c

   1 /* GTK - The GIMP Toolkit
   2  * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Library General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 /*
  21  * GtkTicker Copyright 2000 Syd Logan
  22  */
  23
  24 #include "gtkticker.h"
  25 #include <gtk/gtk.h>
  26
  27 static void gtk_ticker_compute_offsets (GtkTicker    *ticker);
  28 static void gtk_ticker_class_init    (GtkTickerClass    *klass);
  29 static void gtk_ticker_init          (GtkTicker         *ticker);
  30 static void gtk_ticker_map           (GtkWidget        *widget);
  31 static void gtk_ticker_realize       (GtkWidget        *widget);
  32 static void gtk_ticker_size_request  (GtkWidget        *widget,
  33                                      GtkRequisition   *requisition);
  34 static void gtk_ticker_size_allocate (GtkWidget        *widget,
  35                                      GtkAllocation    *allocation);
  36 static void gtk_ticker_paint         (GtkWidget        *widget,
  37                                      GdkRectangle     *area);
  38 static void gtk_ticker_draw          (GtkWidget        *widget,
  39                                      GdkRectangle     *area);
  40 static gint gtk_ticker_expose        (GtkWidget        *widget,
  41                                      GdkEventExpose   *event);
  42 static void gtk_ticker_add_real      (GtkContainer     *container,
  43                                      GtkWidget        *widget);
  44 static void gtk_ticker_remove_real   (GtkContainer     *container,
  45                                      GtkWidget        *widget);
  46 static void gtk_ticker_forall        (GtkContainer     *container,
  47                                      gboolean          include_internals,
  48                                      GtkCallback       callback,
  49                                      gpointer          callback_data);
  50 static GtkType gtk_ticker_child_type (GtkContainer     *container);
  51
  52
  53 static GtkContainerClass *parent_class = NULL;
  54
  55
  56 GtkType
  57 gtk_ticker_get_type (void)
  58 {
  59   static GtkType ticker_type = 0;
  60
  61   if (!ticker_type)
  62     {
  63       static const GtkTypeInfo ticker_info =
  64       {
  65         "GtkTicker",
  66         sizeof (GtkTicker),
  67         sizeof (GtkTickerClass),
  68         (GtkClassInitFunc) gtk_ticker_class_init,
  69         (GtkObjectInitFunc) gtk_ticker_init,
  70         /* reserved_1 */ NULL,
  71         /* reserved_2 */ NULL,
  72         (GtkClassInitFunc) NULL,
  73       };
  74
  75       ticker_type = gtk_type_unique (GTK_TYPE_CONTAINER, &ticker_info);
  76     }
  77
  78   return ticker_type;
  79 }
  80
  81 static void
  82 gtk_ticker_class_init (GtkTickerClass *class)
  83 {
  84   GtkObjectClass *object_class;
  85   GtkWidgetClass *widget_class;
  86   GtkContainerClass *container_class;
  87
  88   object_class = (GtkObjectClass*) class;
  89   widget_class = (GtkWidgetClass*) class;
  90   container_class = (GtkContainerClass*) class;
  91
  92   parent_class = gtk_type_class (GTK_TYPE_CONTAINER);
  93
  94   widget_class->map = gtk_ticker_map;
  95   widget_class->realize = gtk_ticker_realize;
  96   widget_class->size_request = gtk_ticker_size_request;
  97   widget_class->size_allocate = gtk_ticker_size_allocate;
  98 #if ! GTK_CHECK_VERSION(1,3,0)
  99   widget_class->draw = gtk_ticker_draw;
 100 #endif
 101   widget_class->expose_event = gtk_ticker_expose;
 102
 103   container_class->add = gtk_ticker_add_real;
 104   container_class->remove = gtk_ticker_remove_real;
 105   container_class->forall = gtk_ticker_forall;
 106   container_class->child_type = gtk_ticker_child_type;
 107 }
 108
 109 static GtkType
 110 gtk_ticker_child_type (GtkContainer *container)
 111 {
 112   return GTK_TYPE_WIDGET;
 113 }
 114
 115 static void
 116 gtk_ticker_init (GtkTicker *ticker)
 117 {
 118   GTK_WIDGET_UNSET_FLAGS (ticker, GTK_NO_WINDOW);
 119
 120   ticker->interval = (guint) 200;
 121   ticker->scootch = (guint) 2;
 122   ticker->children = NULL;
 123   ticker->timer = 0;
 124   ticker->dirty = TRUE;
 125 }
 126
 127 GtkWidget*
 128 gtk_ticker_new (void)
 129 {
 130   GtkTicker *ticker;
 131
 132   ticker = gtk_type_new (GTK_TYPE_TICKER);
 133   return GTK_WIDGET (ticker);
 134 }
 135
 136 static void
 137 gtk_ticker_put (GtkTicker       *ticker,
 138                GtkWidget      *widget)
 139 {
 140   GtkTickerChild *child_info;
 141
 142   g_return_if_fail (ticker != NULL);
 143   g_return_if_fail (GTK_IS_TICKER (ticker));
 144   g_return_if_fail (widget != NULL);
 145
 146   child_info = g_new(GtkTickerChild, 1);
 147   child_info->widget = widget;
 148   child_info->x = 0;
 149
 150   gtk_widget_set_parent(widget, GTK_WIDGET (ticker));
 151
 152   ticker->children = g_list_append (ticker->children, child_info);
 153
 154   if (GTK_WIDGET_REALIZED (ticker))
 155     gtk_widget_realize (widget);
 156
 157   if (GTK_WIDGET_VISIBLE (ticker) && GTK_WIDGET_VISIBLE (widget))
 158     {
 159       if (GTK_WIDGET_MAPPED (ticker))
 160         gtk_widget_map (widget);
 161
 162       gtk_widget_queue_resize (GTK_WIDGET (ticker));
 163     }
 164 }
 165
 166 void
 167 gtk_ticker_set_interval (GtkTicker *ticker, gint interval )
 168 {
 169   g_return_if_fail (ticker != NULL);
 170   g_return_if_fail (GTK_IS_TICKER (ticker));
 171
 172   if ( interval < 0 )
 173         interval = 200;
 174   ticker->interval = interval;
 175
 176 }
 177
 178 guint
 179 gtk_ticker_get_interval (GtkTicker *ticker )
 180 {
 181   g_return_val_if_fail (ticker != NULL, -1);
 182   g_return_val_if_fail (GTK_IS_TICKER (ticker), -1);
 183
 184   return ticker->interval;
 185 }
 186
 187 void
 188 gtk_ticker_set_scootch (GtkTicker *ticker, gint scootch )
 189 {
 190   g_return_if_fail (ticker != NULL);
 191   g_return_if_fail (GTK_IS_TICKER (ticker));
 192
 193   if ( scootch <= 0 )
 194         scootch = 2;
 195   ticker->scootch = scootch;
 196   ticker->dirty = TRUE;
 197 }
 198
 199 guint
 200 gtk_ticker_get_scootch (GtkTicker *ticker )
 201 {
 202   g_return_val_if_fail (ticker != NULL, -1);
 203   g_return_val_if_fail (GTK_IS_TICKER (ticker), -1);
 204
 205   return ticker->scootch;
 206 }
 207
 208 void
 209 gtk_ticker_set_spacing (GtkTicker *ticker, gint spacing )
 210 {
 211   g_return_if_fail (ticker != NULL);
 212   g_return_if_fail (GTK_IS_TICKER (ticker));
 213
 214   if ( spacing < 0 )
 215         spacing = 0;
 216   ticker->spacing = spacing;
 217   ticker->dirty = TRUE;
 218
 219 }
 220
 221 static int
 222 ticker_timeout( gpointer data )
 223 {
 224         GtkTicker *ticker = (GtkTicker *) data;
 225
 226         if (GTK_WIDGET_VISIBLE (ticker))
 227                 gtk_widget_queue_resize (GTK_WIDGET (ticker));
 228
 229         return( TRUE );
 230 }
 231
 232 void
 233 gtk_ticker_start_scroll(GtkTicker *ticker)
 234 {
 235         g_return_if_fail (ticker != NULL);
 236         g_return_if_fail (GTK_IS_TICKER (ticker));
 237         if ( ticker->timer != 0 )
 238                 return;
 239         ticker->timer = g_timeout_add(ticker->interval,
 240                 ticker_timeout, ticker);
 241 }
 242
 243 void
 244 gtk_ticker_stop_scroll(GtkTicker *ticker)
 245 {
 246         g_return_if_fail (ticker != NULL);
 247         g_return_if_fail (GTK_IS_TICKER (ticker));
 248         if ( ticker->timer == 0 )
 249                 return;
 250         g_source_remove(ticker->timer);
 251         ticker->timer = 0;
 252
 253 }
 254
 255 guint
 256 gtk_ticker_get_spacing (GtkTicker *ticker )
 257 {
 258   g_return_val_if_fail (ticker != NULL, -1);
 259   g_return_val_if_fail (GTK_IS_TICKER (ticker), -1);
 260
 261   return ticker->spacing;
 262 }
 263
 264 static void
 265 gtk_ticker_map (GtkWidget *widget)
 266 {
 267   GtkTicker *ticker;
 268   GtkTickerChild *child;
 269   GList *children;
 270
 271   g_return_if_fail (widget != NULL);
 272   g_return_if_fail (GTK_IS_TICKER (widget));
 273
 274   GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
 275   ticker = GTK_TICKER (widget);
 276
 277   children = ticker->children;
 278   while (children)
 279     {
 280       child = children->data;
 281       children = children->next;
 282
 283       if (GTK_WIDGET_VISIBLE (child->widget) &&
 284           !GTK_WIDGET_MAPPED (child->widget))
 285         gtk_widget_map (child->widget);
 286     }
 287
 288   gdk_window_show (widget->window);
 289 }
 290
 291 static void
 292 gtk_ticker_realize (GtkWidget *widget)
 293 {
 294   GdkWindowAttr attributes;
 295   gint attributes_mask;
 296
 297   g_return_if_fail (widget != NULL);
 298   g_return_if_fail (GTK_IS_TICKER (widget));
 299
 300   GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 301
 302   attributes.window_type = GDK_WINDOW_CHILD;
 303   attributes.x = widget->allocation.x;
 304   attributes.y = widget->allocation.y;
 305   attributes.width = widget->allocation.width;
 306   attributes.height = widget->allocation.height;
 307   attributes.wclass = GDK_INPUT_OUTPUT;
 308   attributes.visual = gtk_widget_get_visual (widget);
 309   attributes.colormap = gtk_widget_get_colormap (widget);
 310   attributes.event_mask = gtk_widget_get_events (widget);
 311   attributes.event_mask |= GDK_EXPOSURE_MASK | GDK_BUTTON_PRESS_MASK;
 312
 313   attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 314
 315   widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
 316         &attributes, attributes_mask);
 317   gdk_window_set_user_data (widget->window, widget);
 318
 319   widget->style = gtk_style_attach (widget->style, widget->window);
 320   gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
 321 }
 322
 323 static void
 324 gtk_ticker_size_request (GtkWidget      *widget,
 325                         GtkRequisition *requisition)
 326 {
 327   GtkTicker *ticker;
 328   GtkTickerChild *child;
 329   GList *children;
 330   GtkRequisition child_requisition;
 331
 332   g_return_if_fail (widget != NULL);
 333   g_return_if_fail (GTK_IS_TICKER (widget));
 334   g_return_if_fail (requisition != NULL);
 335
 336   ticker = GTK_TICKER (widget);
 337   requisition->width = 0;
 338   requisition->height = 0;
 339
 340   children = ticker->children;
 341   while (children)
 342     {
 343       child = children->data;
 344       children = children->next;
 345
 346       if (GTK_WIDGET_VISIBLE (child->widget))
 347         {
 348           gtk_widget_size_request (child->widget, &child_requisition);
 349
 350           requisition->height = MAX (requisition->height,
 351                                      child_requisition.height);
 352           requisition->width += child_requisition.width + ticker->spacing;
 353         }
 354     }
 355   if ( requisition->width > ticker->spacing )
 356         requisition->width -= ticker->spacing;
 357
 358   requisition->height += GTK_CONTAINER (ticker)->border_width * 2;
 359   requisition->width += GTK_CONTAINER (ticker)->border_width * 2;
 360 }
 361
 362 static void
 363 gtk_ticker_compute_offsets (GtkTicker *ticker)
 364 {
 365   GtkTickerChild *child;
 366   GtkRequisition child_requisition;
 367   GList *children;
 368   guint16 border_width;
 369
 370   g_return_if_fail (ticker != NULL);
 371   g_return_if_fail (GTK_IS_TICKER(ticker));
 372
 373   border_width = GTK_CONTAINER (ticker)->border_width;
 374
 375   ticker->width = GTK_WIDGET(ticker)->allocation.width;
 376   ticker->total = 0;
 377   children = ticker->children;
 378   while (children) {
 379       child = children->data;
 380
 381       child->x = 0;
 382       if (GTK_WIDGET_VISIBLE (child->widget)) {
 383           gtk_widget_get_child_requisition (child->widget, &child_requisition);
 384           child->offset = ticker->total;
 385           ticker->total +=
 386                 child_requisition.width + border_width + ticker->spacing;
 387       }
 388       children = children->next;
 389   }
 390   ticker->dirty = FALSE;
 391 }
 392
 393 static void
 394 gtk_ticker_size_allocate (GtkWidget     *widget,
 395                          GtkAllocation *allocation)
 396 {
 397   GtkTicker *ticker;
 398   GtkTickerChild *child;
 399   GtkAllocation child_allocation;
 400   GtkRequisition child_requisition;
 401   GList *children;
 402   guint16 border_width;
 403
 404   g_return_if_fail (widget != NULL);
 405   g_return_if_fail (GTK_IS_TICKER(widget));
 406   g_return_if_fail (allocation != NULL);
 407
 408   ticker = GTK_TICKER (widget);
 409
 410   if ( GTK_WIDGET(ticker)->allocation.width != ticker->width )
 411         ticker->dirty = TRUE;
 412
 413   if ( ticker->dirty == TRUE ) {
 414         gtk_ticker_compute_offsets( ticker );
 415   }
 416
 417   widget->allocation = *allocation;
 418   if (GTK_WIDGET_REALIZED (widget))
 419     gdk_window_move_resize (widget->window,
 420                             allocation->x,
 421                             allocation->y,
 422                             allocation->width,
 423                             allocation->height);
 424
 425   border_width = GTK_CONTAINER (ticker)->border_width;
 426
 427   children = ticker->children;
 428   while (children)
 429     {
 430       child = children->data;
 431       child->x -= ticker->scootch;
 432
 433       if (GTK_WIDGET_VISIBLE (child->widget)) {
 434           gtk_widget_get_child_requisition (child->widget, &child_requisition);
 435           child_allocation.width = child_requisition.width;
 436           child_allocation.x = child->offset + border_width + child->x;
 437           if ( ( child_allocation.x + child_allocation.width ) < GTK_WIDGET(ticker)->allocation.x  ) {
 438                 if ( ticker->total >=  GTK_WIDGET(ticker)->allocation.width ) {
 439                         child->x += GTK_WIDGET(ticker)->allocation.x + GTK_WIDGET(ticker)->allocation.width + ( ticker->total - ( GTK_WIDGET(ticker)->allocation.x + GTK_WIDGET(ticker)->allocation.width ) );
 440                 }
 441                 else {
 442                         child->x += GTK_WIDGET(ticker)->allocation.x + GTK_WIDGET(ticker)->allocation.width;
 443                 }
 444           }
 445           child_allocation.y = border_width;
 446           child_allocation.height = child_requisition.height;
 447           gtk_widget_size_allocate (child->widget, &child_allocation);
 448       }
 449       children = children->next;
 450     }
 451 }
 452
 453 static void
 454 gtk_ticker_paint (GtkWidget    *widget,
 455                  GdkRectangle *area)
 456 {
 457   g_return_if_fail (widget != NULL);
 458   g_return_if_fail (GTK_IS_TICKER (widget));
 459   g_return_if_fail (area != NULL);
 460
 461   if (GTK_WIDGET_DRAWABLE (widget))
 462     gdk_window_clear_area (widget->window, 0, 0, widget->allocation.width,
 463         widget->allocation.height);
 464 }
 465
 466 static void
 467 gtk_ticker_draw (GtkWidget    *widget,
 468                 GdkRectangle *area)
 469 {
 470   GtkTicker *ticker;
 471   GtkTickerChild *child;
 472   GList *children;
 473
 474   g_return_if_fail (widget != NULL);
 475   g_return_if_fail (GTK_IS_TICKER (widget));
 476
 477   if (GTK_WIDGET_DRAWABLE (widget))
 478     {
 479       ticker = GTK_TICKER (widget);
 480       gtk_ticker_paint (widget, area);
 481
 482       children = ticker->children;
 483       while (children)
 484         {
 485           child = children->data;
 486           children = children->next;
 487             gtk_widget_draw (child->widget, NULL);
 488         }
 489     }
 490 }
 491
 492 static gint
 493 gtk_ticker_expose (GtkWidget *widget, GdkEventExpose *event)
 494 {
 495   GtkTicker *ticker;
 496   GtkTickerChild *child;
 497   GdkEventExpose child_event;
 498   GList *children;
 499
 500   g_return_val_if_fail (widget != NULL, FALSE);
 501   g_return_val_if_fail (GTK_IS_TICKER (widget), FALSE);
 502   g_return_val_if_fail (event != NULL, FALSE);
 503
 504   if (GTK_WIDGET_DRAWABLE (widget))
 505     {
 506       ticker = GTK_TICKER (widget);
 507
 508       child_event = *event;
 509
 510       children = ticker->children;
 511       while (children)
 512         {
 513           child = children->data;
 514           children = children->next;
 515
 516           if (GTK_WIDGET_NO_WINDOW (child->widget) &&
 517               gtk_widget_intersect (child->widget, &event->area,
 518                         &child_event.area))
 519             gtk_widget_event (child->widget, (GdkEvent*) &child_event);
 520         }
 521     }
 522
 523   return FALSE;
 524 }
 525
 526 void
 527 gtk_ticker_add(GtkTicker *ticker, GtkWidget *widget)
 528 {
 529         gtk_ticker_add_real( GTK_CONTAINER( ticker ), widget );
 530         ticker->dirty = TRUE;
 531 }
 532
 533 void
 534 gtk_ticker_remove(GtkTicker *ticker, GtkWidget *widget)
 535 {
 536         gtk_ticker_remove_real( GTK_CONTAINER( ticker ), widget );
 537         ticker->dirty = TRUE;
 538 }
 539
 540 static void
 541 gtk_ticker_add_real(GtkContainer *container,
 542                GtkWidget    *widget)
 543 {
 544   g_return_if_fail (container != NULL);
 545   g_return_if_fail (GTK_IS_TICKER (container));
 546   g_return_if_fail (widget != NULL);
 547
 548   gtk_ticker_put(GTK_TICKER (container), widget);
 549 }
 550
 551 static void
 552 gtk_ticker_remove_real(GtkContainer *container,
 553                   GtkWidget    *widget)
 554 {
 555   GtkTicker *ticker;
 556   GtkTickerChild *child;
 557   GList *children;
 558
 559   g_return_if_fail (container != NULL);
 560   g_return_if_fail (GTK_IS_TICKER (container));
 561   g_return_if_fail (widget != NULL);
 562
 563   ticker = GTK_TICKER (container);
 564
 565   children = ticker->children;
 566   while (children)
 567     {
 568       child = children->data;
 569
 570       if (child->widget == widget)
 571         {
 572           gboolean was_visible = GTK_WIDGET_VISIBLE (widget);
 573
 574           gtk_widget_unparent (widget);
 575
 576           ticker->children = g_list_remove_link (ticker->children, children);
 577           g_list_free (children);
 578           g_free (child);
 579
 580           if (was_visible && GTK_WIDGET_VISIBLE (container))
 581             gtk_widget_queue_resize (GTK_WIDGET (container));
 582
 583           break;
 584         }
 585
 586       children = children->next;
 587     }
 588 }
 589
 590 static void
 591 gtk_ticker_forall (GtkContainer *container,
 592                   gboolean      include_internals,
 593                   GtkCallback   callback,
 594                   gpointer      callback_data)
 595 {
 596   GtkTicker *ticker;
 597   GtkTickerChild *child;
 598   GList *children;
 599
 600   g_return_if_fail (container != NULL);
 601   g_return_if_fail (GTK_IS_TICKER (container));
 602   g_return_if_fail (callback != NULL);
 603
 604   ticker = GTK_TICKER (container);
 605
 606   children = ticker->children;
 607   while (children)
 608     {
 609       child = children->data;
 610       children = children->next;
 611
 612       (* callback) (child->widget, callback_data);
 613     }
 614 }