Pileus Git - ~andy/gtk/blob - gtk/gtkframe.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 Lesser 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  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser 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  * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
  22  * file for a list of people on the GTK+ Team.  See the ChangeLog
  23  * files for a list of changes.  These files are distributed with
  24  * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
  25  */
  26
  27 #include <string.h>
  28 #include "gtkframe.h"
  29 #include "gtklabel.h"
  30 #include "gtkintl.h"
  31
  32 #define LABEL_PAD 1
  33 #define LABEL_SIDE_PAD 2
  34
  35 enum {
  36   PROP_0,
  37   PROP_LABEL,
  38   PROP_LABEL_XALIGN,
  39   PROP_LABEL_YALIGN,
  40   PROP_SHADOW,
  41   PROP_LABEL_WIDGET
  42 };
  43
  44
  45 static void gtk_frame_class_init    (GtkFrameClass  *klass);
  46 static void gtk_frame_init          (GtkFrame       *frame);
  47 static void gtk_frame_set_property (GObject      *object,
  48                                     guint         param_id,
  49                                     const GValue *value,
  50                                     GParamSpec   *pspec);
  51 static void gtk_frame_get_property (GObject     *object,
  52                                     guint        param_id,
  53                                     GValue      *value,
  54                                     GParamSpec  *pspec);
  55 static void gtk_frame_paint         (GtkWidget      *widget,
  56                                      GdkRectangle   *area);
  57 static gint gtk_frame_expose        (GtkWidget      *widget,
  58                                      GdkEventExpose *event);
  59 static void gtk_frame_size_request  (GtkWidget      *widget,
  60                                      GtkRequisition *requisition);
  61 static void gtk_frame_size_allocate (GtkWidget      *widget,
  62                                      GtkAllocation  *allocation);
  63 static void gtk_frame_remove        (GtkContainer   *container,
  64                                      GtkWidget      *child);
  65 static void gtk_frame_forall        (GtkContainer   *container,
  66                                      gboolean        include_internals,
  67                                      GtkCallback     callback,
  68                                      gpointer        callback_data);
  69
  70 static void gtk_frame_compute_child_allocation      (GtkFrame      *frame,
  71                                                      GtkAllocation *child_allocation);
  72 static void gtk_frame_real_compute_child_allocation (GtkFrame      *frame,
  73                                                      GtkAllocation *child_allocation);
  74
  75 static GtkBinClass *parent_class = NULL;
  76
  77
  78 GtkType
  79 gtk_frame_get_type (void)
  80 {
  81   static GtkType frame_type = 0;
  82
  83   if (!frame_type)
  84     {
  85       static const GtkTypeInfo frame_info =
  86       {
  87         "GtkFrame",
  88         sizeof (GtkFrame),
  89         sizeof (GtkFrameClass),
  90         (GtkClassInitFunc) gtk_frame_class_init,
  91         (GtkObjectInitFunc) gtk_frame_init,
  92         /* reserved_1 */ NULL,
  93         /* reserved_2 */ NULL,
  94         (GtkClassInitFunc) NULL,
  95       };
  96
  97       frame_type = gtk_type_unique (gtk_bin_get_type (), &frame_info);
  98     }
  99
 100   return frame_type;
 101 }
 102
 103 static void
 104 gtk_frame_class_init (GtkFrameClass *class)
 105 {
 106   GObjectClass *gobject_class;
 107   GtkObjectClass *object_class;
 108   GtkWidgetClass *widget_class;
 109   GtkContainerClass *container_class;
 110
 111   gobject_class = (GObjectClass*) class;
 112   object_class = GTK_OBJECT_CLASS (class);
 113   widget_class = GTK_WIDGET_CLASS (class);
 114   container_class = GTK_CONTAINER_CLASS (class);
 115
 116   parent_class = gtk_type_class (gtk_bin_get_type ());
 117
 118   gobject_class->set_property = gtk_frame_set_property;
 119   gobject_class->get_property = gtk_frame_get_property;
 120
 121   g_object_class_install_property (gobject_class,
 122                                    PROP_LABEL,
 123                                    g_param_spec_string ("label",
 124                                                         _("Label"),
 125                                                         _("Text of the frame's label."),
 126                                                         NULL,
 127                                                         G_PARAM_READABLE |
 128                                                         G_PARAM_WRITABLE));
 129   g_object_class_install_property (gobject_class,
 130                                    PROP_LABEL_XALIGN,
 131                                    g_param_spec_double ("label_xalign",
 132                                                         _("Label xalign"),
 133                                                         _("The horizontal alignment of the label."),
 134                                                         0.0,
 135                                                         1.0,
 136                                                         0.5,
 137                                                         G_PARAM_READABLE |
 138                                                         G_PARAM_WRITABLE));
 139   g_object_class_install_property (gobject_class,
 140                                    PROP_LABEL_YALIGN,
 141                                    g_param_spec_double ("label_yalign",
 142                                                         _("Label yalign"),
 143                                                         _("The vertical alignment of the label."),
 144                                                         0.0,
 145                                                         1.0,
 146                                                         0.5,
 147                                                         G_PARAM_READABLE |
 148                                                         G_PARAM_WRITABLE));
 149   g_object_class_install_property (gobject_class,
 150                                    PROP_SHADOW,
 151                                    g_param_spec_enum ("shadow",
 152                                                       _("Frame shadow"),
 153                                                       _("Appearance of the frame border."),
 154                                                       GTK_TYPE_SHADOW_TYPE,
 155                                                       GTK_SHADOW_ETCHED_IN,
 156                                                       G_PARAM_READABLE | G_PARAM_WRITABLE));
 157
 158   g_object_class_install_property (gobject_class,
 159                                    PROP_LABEL_WIDGET,
 160                                    g_param_spec_object ("label_widget",
 161                                                         _("Label widget"),
 162                                                         _("A widget to display in place of the usual frame label."),
 163                                                         GTK_TYPE_WIDGET,
 164                                                         G_PARAM_READABLE | G_PARAM_WRITABLE));
 165
 166   widget_class->expose_event = gtk_frame_expose;
 167   widget_class->size_request = gtk_frame_size_request;
 168   widget_class->size_allocate = gtk_frame_size_allocate;
 169
 170   container_class->remove = gtk_frame_remove;
 171   container_class->forall = gtk_frame_forall;
 172
 173   class->compute_child_allocation = gtk_frame_real_compute_child_allocation;
 174 }
 175
 176 static void
 177 gtk_frame_init (GtkFrame *frame)
 178 {
 179   frame->label_widget = NULL;
 180   frame->shadow_type = GTK_SHADOW_ETCHED_IN;
 181   frame->label_xalign = 0.0;
 182   frame->label_yalign = 0.5;
 183 }
 184
 185 static void
 186 gtk_frame_set_property (GObject         *object,
 187                         guint            prop_id,
 188                         const GValue    *value,
 189                         GParamSpec      *pspec)
 190 {
 191   GtkFrame *frame;
 192
 193   frame = GTK_FRAME (object);
 194
 195   switch (prop_id)
 196     {
 197     case PROP_LABEL:
 198       gtk_frame_set_label (frame, g_value_get_string (value));
 199       break;
 200     case PROP_LABEL_XALIGN:
 201       gtk_frame_set_label_align (frame, g_value_get_double (value),
 202                                  frame->label_yalign);
 203       break;
 204     case PROP_LABEL_YALIGN:
 205       gtk_frame_set_label_align (frame, frame->label_xalign,
 206                                  g_value_get_double (value));
 207       break;
 208     case PROP_SHADOW:
 209       gtk_frame_set_shadow_type (frame, g_value_get_enum (value));
 210       break;
 211     case PROP_LABEL_WIDGET:
 212       gtk_frame_set_label_widget (frame, g_value_get_object (value));
 213       break;
 214     default:
 215       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 216       break;
 217     }
 218 }
 219
 220 static void
 221 gtk_frame_get_property (GObject         *object,
 222                         guint            prop_id,
 223                         GValue          *value,
 224                         GParamSpec      *pspec)
 225 {
 226   GtkFrame *frame;
 227
 228   frame = GTK_FRAME (object);
 229
 230   switch (prop_id)
 231     {
 232     case PROP_LABEL:
 233       g_value_set_string (value, gtk_frame_get_label (frame));
 234       break;
 235     case PROP_LABEL_XALIGN:
 236       g_value_set_double (value, frame->label_xalign);
 237       break;
 238     case PROP_LABEL_YALIGN:
 239       g_value_set_double (value, frame->label_yalign);
 240       break;
 241     case PROP_SHADOW:
 242       g_value_set_enum (value, frame->shadow_type);
 243       break;
 244     case PROP_LABEL_WIDGET:
 245       g_value_set_object (value,
 246                           frame->label_widget ?
 247                           G_OBJECT (frame->label_widget) : NULL);
 248       break;
 249     default:
 250       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 251       break;
 252     }
 253 }
 254
 255 GtkWidget*
 256 gtk_frame_new (const gchar *label)
 257 {
 258   GtkFrame *frame;
 259
 260   frame = gtk_type_new (gtk_frame_get_type ());
 261
 262   gtk_frame_set_label (frame, label);
 263
 264   return GTK_WIDGET (frame);
 265 }
 266
 267 static void
 268 gtk_frame_remove (GtkContainer *container,
 269                   GtkWidget    *child)
 270 {
 271   GtkFrame *frame = GTK_FRAME (container);
 272
 273   if (frame->label_widget == child)
 274     gtk_frame_set_label_widget (frame, NULL);
 275   else
 276     GTK_CONTAINER_CLASS (parent_class)->remove (container, child);
 277 }
 278
 279 static void
 280 gtk_frame_forall (GtkContainer *container,
 281                   gboolean      include_internals,
 282                   GtkCallback   callback,
 283                   gpointer      callback_data)
 284 {
 285   GtkBin *bin = GTK_BIN (container);
 286   GtkFrame *frame = GTK_FRAME (container);
 287
 288   if (bin->child)
 289     (* callback) (bin->child, callback_data);
 290
 291   if (frame->label_widget)
 292     (* callback) (frame->label_widget, callback_data);
 293 }
 294
 295 void
 296 gtk_frame_set_label (GtkFrame *frame,
 297                      const gchar *label)
 298 {
 299   g_return_if_fail (GTK_IS_FRAME (frame));
 300
 301   if (!label)
 302     {
 303       gtk_frame_set_label_widget (frame, NULL);
 304     }
 305   else
 306     {
 307       GtkWidget *child = gtk_label_new (label);
 308       gtk_widget_show (child);
 309
 310       gtk_frame_set_label_widget (frame, child);
 311     }
 312
 313   g_object_notify (G_OBJECT (frame), "label");
 314 }
 315
 316 /**
 317  * gtk_frame_get_label:
 318  * @frame: a #GtkFrame
 319  *
 320  * If the frame's label widget is a #GtkLabel, return the
 321  * text in the label widget. (The frame will have a #GtkLabel
 322  * for the label widget if a non-%NULL argument was passed
 323  * to gtk_frame_new().)
 324  *
 325  * Return value: the text in the label, or %NULL if there
 326  *               was no label widget or the lable widget was not
 327  *               a #GtkLabel. This value must be freed with g_free().
 328  **/
 329 G_CONST_RETURN gchar *
 330 gtk_frame_get_label (GtkFrame *frame)
 331 {
 332   g_return_val_if_fail (GTK_IS_FRAME (frame), NULL);
 333
 334   if (frame->label_widget && GTK_IS_LABEL (frame->label_widget))
 335     return gtk_label_get_text (GTK_LABEL (frame->label_widget));
 336   else
 337     return NULL;
 338 }
 339
 340 /**
 341  * gtk_frame_set_label_widget:
 342  * @frame: a #GtkFrame
 343  * @label_widget: the new label widget
 344  *
 345  * Set the label widget for the frame. This is the widget that
 346  * will appear embedded in the top edge of the frame as a
 347  * title.
 348  **/
 349 void
 350 gtk_frame_set_label_widget (GtkFrame  *frame,
 351                             GtkWidget *label_widget)
 352 {
 353   gboolean need_resize = FALSE;
 354
 355   g_return_if_fail (GTK_IS_FRAME (frame));
 356   g_return_if_fail (label_widget == NULL || GTK_IS_WIDGET (label_widget));
 357   g_return_if_fail (label_widget == NULL || label_widget->parent == NULL);
 358
 359   if (frame->label_widget == label_widget)
 360     return;
 361
 362   if (frame->label_widget)
 363     {
 364       need_resize = GTK_WIDGET_VISIBLE (frame->label_widget);
 365       gtk_widget_unparent (frame->label_widget);
 366     }
 367
 368   frame->label_widget = label_widget;
 369
 370   if (label_widget)
 371     {
 372       frame->label_widget = label_widget;
 373       gtk_widget_set_parent (label_widget, GTK_WIDGET (frame));
 374       need_resize |= GTK_WIDGET_VISIBLE (label_widget);
 375     }
 376
 377   if (GTK_WIDGET_VISIBLE (frame) && need_resize)
 378     gtk_widget_queue_resize (GTK_WIDGET (frame));
 379
 380   g_object_notify (G_OBJECT (frame), "label_widget");
 381 }
 382
 383 /**
 384  * gtk_frame_get_label_widget:
 385  * @frame: a #GtkFrame
 386  *
 387  * Retrieves the label widget for the frame. See
 388  * gtk_frame_set_label_widget().
 389  *
 390  * Return value: the label widget, or %NULL if there is none.
 391  **/
 392 GtkWidget *
 393 gtk_frame_get_label_widget (GtkFrame *frame)
 394 {
 395   g_return_val_if_fail (GTK_IS_FRAME (frame), NULL);
 396
 397   return frame->label_widget;
 398 }
 399
 400 void
 401 gtk_frame_set_label_align (GtkFrame *frame,
 402                            gfloat    xalign,
 403                            gfloat    yalign)
 404 {
 405   g_return_if_fail (GTK_IS_FRAME (frame));
 406
 407   xalign = CLAMP (xalign, 0.0, 1.0);
 408   yalign = CLAMP (yalign, 0.0, 1.0);
 409
 410   if (xalign != frame->label_xalign)
 411     {
 412       frame->label_xalign = xalign;
 413       g_object_notify (G_OBJECT (frame), "label_xalign");
 414     }
 415
 416   if (yalign != frame->label_yalign)
 417     {
 418       frame->label_yalign = yalign;
 419       g_object_notify (G_OBJECT (frame), "label_yalign");
 420     }
 421
 422   gtk_widget_queue_resize (GTK_WIDGET (frame));
 423 }
 424
 425 /**
 426  * gtk_frame_get_label_align:
 427  * @frame: a #GtkFrame
 428  * @xalign: location to store X alignment of frame's label, or %NULL
 429  * @yalign: location to store X alignment of frame's label, or %NULL
 430  *
 431  * Retrieves the X and Y alignment of the frame's label. See
 432  * gtk_frame_set_label_align().
 433  **/
 434 void
 435 gtk_frame_get_label_align (GtkFrame *frame,
 436                            gfloat   *xalign,
 437                            gfloat   *yalign)
 438 {
 439   g_return_if_fail (GTK_IS_FRAME (frame));
 440
 441   if (xalign)
 442     *xalign = frame->label_xalign;
 443   if (yalign)
 444     *yalign = frame->label_yalign;
 445 }
 446
 447 void
 448 gtk_frame_set_shadow_type (GtkFrame      *frame,
 449                            GtkShadowType  type)
 450 {
 451   g_return_if_fail (GTK_IS_FRAME (frame));
 452
 453   if ((GtkShadowType) frame->shadow_type != type)
 454     {
 455       frame->shadow_type = type;
 456       g_object_notify (G_OBJECT (frame), "shadow");
 457
 458       if (GTK_WIDGET_DRAWABLE (frame))
 459         {
 460           gtk_widget_queue_clear (GTK_WIDGET (frame));
 461         }
 462
 463       gtk_widget_queue_resize (GTK_WIDGET (frame));
 464     }
 465 }
 466
 467 /**
 468  * gtk_frame_get_shadow_type:
 469  * @frame: a #GtkFrame
 470  *
 471  * Retrieves the shadow type of the frame. See
 472  * gtk_frame_set_shadow_type().
 473  *
 474  * Return value: the current shadow type of the frame.
 475  **/
 476 GtkShadowType
 477 gtk_frame_get_shadow_type (GtkFrame *frame)
 478 {
 479   g_return_val_if_fail (GTK_IS_FRAME (frame), GTK_SHADOW_ETCHED_IN);
 480
 481   return frame->shadow_type;
 482 }
 483
 484 static void
 485 gtk_frame_paint (GtkWidget    *widget,
 486                  GdkRectangle *area)
 487 {
 488   GtkFrame *frame;
 489   gint x, y, width, height;
 490
 491   if (GTK_WIDGET_DRAWABLE (widget))
 492     {
 493       frame = GTK_FRAME (widget);
 494
 495       x = frame->child_allocation.x - widget->style->xthickness;
 496       y = frame->child_allocation.y - widget->style->ythickness;
 497       width = frame->child_allocation.width + 2 * widget->style->xthickness;
 498       height =  frame->child_allocation.height + 2 * widget->style->ythickness;
 499
 500       if (frame->label_widget)
 501         {
 502           GtkRequisition child_requisition;
 503           gfloat xalign;
 504           gint height_extra;
 505           gint x2;
 506
 507           gtk_widget_get_child_requisition (frame->label_widget, &child_requisition);
 508
 509           if (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_LTR)
 510             xalign = frame->label_xalign;
 511           else
 512             xalign = 1 - frame->label_xalign;
 513
 514           height_extra = MAX (0, child_requisition.height - widget->style->xthickness);
 515           y -= height_extra * (1 - frame->label_yalign);
 516           height += height_extra * (1 - frame->label_yalign);
 517
 518           x2 = widget->style->xthickness + (frame->child_allocation.width - child_requisition.width - 2 * LABEL_PAD - 2 * LABEL_SIDE_PAD) * xalign + LABEL_SIDE_PAD;
 519
 520
 521           gtk_paint_shadow_gap (widget->style, widget->window,
 522                                 GTK_STATE_NORMAL, frame->shadow_type,
 523                                 area, widget, "frame",
 524                                 x, y, width, height,
 525                                 GTK_POS_TOP,
 526                                 x2, child_requisition.width + 2 * LABEL_PAD);
 527         }
 528        else
 529          gtk_paint_shadow (widget->style, widget->window,
 530                            GTK_STATE_NORMAL, frame->shadow_type,
 531                            area, widget, "frame",
 532                            x, y, width, height);
 533     }
 534 }
 535
 536 static gboolean
 537 gtk_frame_expose (GtkWidget      *widget,
 538                   GdkEventExpose *event)
 539 {
 540   if (GTK_WIDGET_DRAWABLE (widget))
 541     {
 542       gtk_frame_paint (widget, &event->area);
 543
 544       (* GTK_WIDGET_CLASS (parent_class)->expose_event) (widget, event);
 545     }
 546
 547   return FALSE;
 548 }
 549
 550 static void
 551 gtk_frame_size_request (GtkWidget      *widget,
 552                         GtkRequisition *requisition)
 553 {
 554   GtkFrame *frame = GTK_FRAME (widget);
 555   GtkBin *bin = GTK_BIN (widget);
 556   GtkRequisition child_requisition;
 557
 558   if (frame->label_widget && GTK_WIDGET_VISIBLE (frame->label_widget))
 559     {
 560       gtk_widget_size_request (frame->label_widget, &child_requisition);
 561
 562       requisition->width = child_requisition.width + 2 * LABEL_PAD + 2 * LABEL_SIDE_PAD;
 563       requisition->height =
 564         MAX (0, child_requisition.height - GTK_WIDGET (widget)->style->xthickness);
 565     }
 566   else
 567     {
 568       requisition->width = 0;
 569       requisition->height = 0;
 570     }
 571
 572   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 573     {
 574       gtk_widget_size_request (bin->child, &child_requisition);
 575
 576       requisition->width = MAX (requisition->width, child_requisition.width);
 577       requisition->height += child_requisition.height;
 578     }
 579
 580   requisition->width += (GTK_CONTAINER (widget)->border_width +
 581                          GTK_WIDGET (widget)->style->xthickness) * 2;
 582   requisition->height += (GTK_CONTAINER (widget)->border_width +
 583                           GTK_WIDGET (widget)->style->ythickness) * 2;
 584 }
 585
 586 static void
 587 gtk_frame_size_allocate (GtkWidget     *widget,
 588                          GtkAllocation *allocation)
 589 {
 590   GtkFrame *frame = GTK_FRAME (widget);
 591   GtkBin *bin = GTK_BIN (widget);
 592   GtkAllocation new_allocation;
 593
 594   widget->allocation = *allocation;
 595
 596   gtk_frame_compute_child_allocation (frame, &new_allocation);
 597
 598   /* If the child allocation changed, that means that the frame is drawn
 599    * in a new place, so we must redraw the entire widget.
 600    */
 601   if (GTK_WIDGET_MAPPED (widget) &&
 602       (new_allocation.x != frame->child_allocation.x ||
 603        new_allocation.y != frame->child_allocation.y ||
 604        new_allocation.width != frame->child_allocation.width ||
 605        new_allocation.height != frame->child_allocation.height))
 606     gtk_widget_queue_clear (widget);
 607
 608   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 609     gtk_widget_size_allocate (bin->child, &new_allocation);
 610
 611   frame->child_allocation = new_allocation;
 612
 613   if (frame->label_widget && GTK_WIDGET_VISIBLE (frame->label_widget))
 614     {
 615       GtkRequisition child_requisition;
 616       GtkAllocation child_allocation;
 617       gfloat xalign;
 618
 619       gtk_widget_get_child_requisition (frame->label_widget, &child_requisition);
 620
 621       if (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_LTR)
 622         xalign = frame->label_xalign;
 623       else
 624         xalign = 1 - frame->label_xalign;
 625
 626       child_allocation.x = frame->child_allocation.x + LABEL_SIDE_PAD +
 627         (frame->child_allocation.width - child_requisition.width - 2 * LABEL_PAD - 2 * LABEL_SIDE_PAD) * xalign + LABEL_PAD;
 628       child_allocation.width = child_requisition.width;
 629
 630       child_allocation.y = frame->child_allocation.y - child_requisition.height;
 631       child_allocation.height = child_requisition.height;
 632
 633       gtk_widget_size_allocate (frame->label_widget, &child_allocation);
 634     }
 635 }
 636
 637 static void
 638 gtk_frame_compute_child_allocation (GtkFrame      *frame,
 639                                     GtkAllocation *child_allocation)
 640 {
 641   g_return_if_fail (GTK_IS_FRAME (frame));
 642   g_return_if_fail (child_allocation != NULL);
 643
 644   GTK_FRAME_GET_CLASS (frame)->compute_child_allocation (frame, child_allocation);
 645 }
 646
 647 static void
 648 gtk_frame_real_compute_child_allocation (GtkFrame      *frame,
 649                                          GtkAllocation *child_allocation)
 650 {
 651   GtkWidget *widget = GTK_WIDGET (frame);
 652   GtkAllocation *allocation = &widget->allocation;
 653   GtkRequisition child_requisition;
 654   gint top_margin;
 655
 656   if (frame->label_widget)
 657     {
 658       gtk_widget_get_child_requisition (frame->label_widget, &child_requisition);
 659       top_margin = MAX (child_requisition.height, widget->style->ythickness);
 660     }
 661   else
 662     top_margin = widget->style->ythickness;
 663
 664   child_allocation->x = (GTK_CONTAINER (frame)->border_width +
 665                          widget->style->xthickness);
 666   child_allocation->width = MAX(1, (gint)allocation->width - child_allocation->x * 2);
 667
 668   child_allocation->y = (GTK_CONTAINER (frame)->border_width + top_margin);
 669   child_allocation->height = MAX (1, ((gint)allocation->height - child_allocation->y -
 670                                       (gint)GTK_CONTAINER (frame)->border_width -
 671                                       (gint)widget->style->ythickness));
 672
 673   child_allocation->x += allocation->x;
 674   child_allocation->y += allocation->y;
 675 }