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_SHADOW_TYPE,
  42   PROP_LABEL_WIDGET
  43 };
  44
  45
  46 static void gtk_frame_class_init    (GtkFrameClass  *klass);
  47 static void gtk_frame_init          (GtkFrame       *frame);
  48 static void gtk_frame_set_property (GObject      *object,
  49                                     guint         param_id,
  50                                     const GValue *value,
  51                                     GParamSpec   *pspec);
  52 static void gtk_frame_get_property (GObject     *object,
  53                                     guint        param_id,
  54                                     GValue      *value,
  55                                     GParamSpec  *pspec);
  56 static void gtk_frame_paint         (GtkWidget      *widget,
  57                                      GdkRectangle   *area);
  58 static gint gtk_frame_expose        (GtkWidget      *widget,
  59                                      GdkEventExpose *event);
  60 static void gtk_frame_size_request  (GtkWidget      *widget,
  61                                      GtkRequisition *requisition);
  62 static void gtk_frame_size_allocate (GtkWidget      *widget,
  63                                      GtkAllocation  *allocation);
  64 static void gtk_frame_remove        (GtkContainer   *container,
  65                                      GtkWidget      *child);
  66 static void gtk_frame_forall        (GtkContainer   *container,
  67                                      gboolean        include_internals,
  68                                      GtkCallback     callback,
  69                                      gpointer        callback_data);
  70
  71 static void gtk_frame_compute_child_allocation      (GtkFrame      *frame,
  72                                                      GtkAllocation *child_allocation);
  73 static void gtk_frame_real_compute_child_allocation (GtkFrame      *frame,
  74                                                      GtkAllocation *child_allocation);
  75
  76 static GtkBinClass *parent_class = NULL;
  77
  78
  79 GtkType
  80 gtk_frame_get_type (void)
  81 {
  82   static GtkType frame_type = 0;
  83
  84   if (!frame_type)
  85     {
  86       static const GtkTypeInfo frame_info =
  87       {
  88         "GtkFrame",
  89         sizeof (GtkFrame),
  90         sizeof (GtkFrameClass),
  91         (GtkClassInitFunc) gtk_frame_class_init,
  92         (GtkObjectInitFunc) gtk_frame_init,
  93         /* reserved_1 */ NULL,
  94         /* reserved_2 */ NULL,
  95         (GtkClassInitFunc) NULL,
  96       };
  97
  98       frame_type = gtk_type_unique (gtk_bin_get_type (), &frame_info);
  99     }
 100
 101   return frame_type;
 102 }
 103
 104 static void
 105 gtk_frame_class_init (GtkFrameClass *class)
 106 {
 107   GObjectClass *gobject_class;
 108   GtkObjectClass *object_class;
 109   GtkWidgetClass *widget_class;
 110   GtkContainerClass *container_class;
 111
 112   gobject_class = (GObjectClass*) class;
 113   object_class = GTK_OBJECT_CLASS (class);
 114   widget_class = GTK_WIDGET_CLASS (class);
 115   container_class = GTK_CONTAINER_CLASS (class);
 116
 117   parent_class = gtk_type_class (gtk_bin_get_type ());
 118
 119   gobject_class->set_property = gtk_frame_set_property;
 120   gobject_class->get_property = gtk_frame_get_property;
 121
 122   g_object_class_install_property (gobject_class,
 123                                    PROP_LABEL,
 124                                    g_param_spec_string ("label",
 125                                                         _("Label"),
 126                                                         _("Text of the frame's label."),
 127                                                         NULL,
 128                                                         G_PARAM_READABLE |
 129                                                         G_PARAM_WRITABLE));
 130   g_object_class_install_property (gobject_class,
 131                                    PROP_LABEL_XALIGN,
 132                                    g_param_spec_double ("label_xalign",
 133                                                         _("Label xalign"),
 134                                                         _("The horizontal alignment of the label."),
 135                                                         0.0,
 136                                                         1.0,
 137                                                         0.5,
 138                                                         G_PARAM_READABLE |
 139                                                         G_PARAM_WRITABLE));
 140   g_object_class_install_property (gobject_class,
 141                                    PROP_LABEL_YALIGN,
 142                                    g_param_spec_double ("label_yalign",
 143                                                         _("Label yalign"),
 144                                                         _("The vertical alignment of the label."),
 145                                                         0.0,
 146                                                         1.0,
 147                                                         0.5,
 148                                                         G_PARAM_READABLE |
 149                                                         G_PARAM_WRITABLE));
 150   g_object_class_install_property (gobject_class,
 151                                    PROP_SHADOW,
 152                                    g_param_spec_enum ("shadow", NULL,
 153                                                       _("Deprecated property, use shadow_type instead."),
 154                                                       GTK_TYPE_SHADOW_TYPE,
 155                                                       GTK_SHADOW_ETCHED_IN,
 156                                                       G_PARAM_READABLE | G_PARAM_WRITABLE));
 157   g_object_class_install_property (gobject_class,
 158                                    PROP_SHADOW_TYPE,
 159                                    g_param_spec_enum ("shadow_type",
 160                                                       _("Frame shadow"),
 161                                                       _("Appearance of the frame border."),
 162                                                       GTK_TYPE_SHADOW_TYPE,
 163                                                       GTK_SHADOW_ETCHED_IN,
 164                                                       G_PARAM_READABLE | G_PARAM_WRITABLE));
 165
 166   g_object_class_install_property (gobject_class,
 167                                    PROP_LABEL_WIDGET,
 168                                    g_param_spec_object ("label_widget",
 169                                                         _("Label widget"),
 170                                                         _("A widget to display in place of the usual frame label."),
 171                                                         GTK_TYPE_WIDGET,
 172                                                         G_PARAM_READABLE | G_PARAM_WRITABLE));
 173
 174   widget_class->expose_event = gtk_frame_expose;
 175   widget_class->size_request = gtk_frame_size_request;
 176   widget_class->size_allocate = gtk_frame_size_allocate;
 177
 178   container_class->remove = gtk_frame_remove;
 179   container_class->forall = gtk_frame_forall;
 180
 181   class->compute_child_allocation = gtk_frame_real_compute_child_allocation;
 182 }
 183
 184 static void
 185 gtk_frame_init (GtkFrame *frame)
 186 {
 187   frame->label_widget = NULL;
 188   frame->shadow_type = GTK_SHADOW_ETCHED_IN;
 189   frame->label_xalign = 0.0;
 190   frame->label_yalign = 0.5;
 191 }
 192
 193 static void
 194 gtk_frame_set_property (GObject         *object,
 195                         guint            prop_id,
 196                         const GValue    *value,
 197                         GParamSpec      *pspec)
 198 {
 199   GtkFrame *frame;
 200
 201   frame = GTK_FRAME (object);
 202
 203   switch (prop_id)
 204     {
 205     case PROP_LABEL:
 206       gtk_frame_set_label (frame, g_value_get_string (value));
 207       break;
 208     case PROP_LABEL_XALIGN:
 209       gtk_frame_set_label_align (frame, g_value_get_double (value),
 210                                  frame->label_yalign);
 211       break;
 212     case PROP_LABEL_YALIGN:
 213       gtk_frame_set_label_align (frame, frame->label_xalign,
 214                                  g_value_get_double (value));
 215       break;
 216     case PROP_SHADOW:
 217     case PROP_SHADOW_TYPE:
 218       gtk_frame_set_shadow_type (frame, g_value_get_enum (value));
 219       break;
 220     case PROP_LABEL_WIDGET:
 221       gtk_frame_set_label_widget (frame, g_value_get_object (value));
 222       break;
 223     default:
 224       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 225       break;
 226     }
 227 }
 228
 229 static void
 230 gtk_frame_get_property (GObject         *object,
 231                         guint            prop_id,
 232                         GValue          *value,
 233                         GParamSpec      *pspec)
 234 {
 235   GtkFrame *frame;
 236
 237   frame = GTK_FRAME (object);
 238
 239   switch (prop_id)
 240     {
 241     case PROP_LABEL:
 242       g_value_set_string (value, gtk_frame_get_label (frame));
 243       break;
 244     case PROP_LABEL_XALIGN:
 245       g_value_set_double (value, frame->label_xalign);
 246       break;
 247     case PROP_LABEL_YALIGN:
 248       g_value_set_double (value, frame->label_yalign);
 249       break;
 250     case PROP_SHADOW:
 251     case PROP_SHADOW_TYPE:
 252       g_value_set_enum (value, frame->shadow_type);
 253       break;
 254     case PROP_LABEL_WIDGET:
 255       g_value_set_object (value,
 256                           frame->label_widget ?
 257                           G_OBJECT (frame->label_widget) : NULL);
 258       break;
 259     default:
 260       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 261       break;
 262     }
 263 }
 264
 265 GtkWidget*
 266 gtk_frame_new (const gchar *label)
 267 {
 268   GtkFrame *frame;
 269
 270   frame = gtk_type_new (gtk_frame_get_type ());
 271
 272   gtk_frame_set_label (frame, label);
 273
 274   return GTK_WIDGET (frame);
 275 }
 276
 277 static void
 278 gtk_frame_remove (GtkContainer *container,
 279                   GtkWidget    *child)
 280 {
 281   GtkFrame *frame = GTK_FRAME (container);
 282
 283   if (frame->label_widget == child)
 284     gtk_frame_set_label_widget (frame, NULL);
 285   else
 286     GTK_CONTAINER_CLASS (parent_class)->remove (container, child);
 287 }
 288
 289 static void
 290 gtk_frame_forall (GtkContainer *container,
 291                   gboolean      include_internals,
 292                   GtkCallback   callback,
 293                   gpointer      callback_data)
 294 {
 295   GtkBin *bin = GTK_BIN (container);
 296   GtkFrame *frame = GTK_FRAME (container);
 297
 298   if (bin->child)
 299     (* callback) (bin->child, callback_data);
 300
 301   if (frame->label_widget)
 302     (* callback) (frame->label_widget, callback_data);
 303 }
 304
 305 void
 306 gtk_frame_set_label (GtkFrame *frame,
 307                      const gchar *label)
 308 {
 309   g_return_if_fail (GTK_IS_FRAME (frame));
 310
 311   if (!label)
 312     {
 313       gtk_frame_set_label_widget (frame, NULL);
 314     }
 315   else
 316     {
 317       GtkWidget *child = gtk_label_new (label);
 318       gtk_widget_show (child);
 319
 320       gtk_frame_set_label_widget (frame, child);
 321     }
 322
 323   g_object_notify (G_OBJECT (frame), "label");
 324 }
 325
 326 /**
 327  * gtk_frame_get_label:
 328  * @frame: a #GtkFrame
 329  *
 330  * If the frame's label widget is a #GtkLabel, return the
 331  * text in the label widget. (The frame will have a #GtkLabel
 332  * for the label widget if a non-%NULL argument was passed
 333  * to gtk_frame_new().)
 334  *
 335  * Return value: the text in the label, or %NULL if there
 336  *               was no label widget or the lable widget was not
 337  *               a #GtkLabel. This value must be freed with g_free().
 338  **/
 339 G_CONST_RETURN gchar *
 340 gtk_frame_get_label (GtkFrame *frame)
 341 {
 342   g_return_val_if_fail (GTK_IS_FRAME (frame), NULL);
 343
 344   if (frame->label_widget && GTK_IS_LABEL (frame->label_widget))
 345     return gtk_label_get_text (GTK_LABEL (frame->label_widget));
 346   else
 347     return NULL;
 348 }
 349
 350 /**
 351  * gtk_frame_set_label_widget:
 352  * @frame: a #GtkFrame
 353  * @label_widget: the new label widget
 354  *
 355  * Set the label widget for the frame. This is the widget that
 356  * will appear embedded in the top edge of the frame as a
 357  * title.
 358  **/
 359 void
 360 gtk_frame_set_label_widget (GtkFrame  *frame,
 361                             GtkWidget *label_widget)
 362 {
 363   gboolean need_resize = FALSE;
 364
 365   g_return_if_fail (GTK_IS_FRAME (frame));
 366   g_return_if_fail (label_widget == NULL || GTK_IS_WIDGET (label_widget));
 367   g_return_if_fail (label_widget == NULL || label_widget->parent == NULL);
 368
 369   if (frame->label_widget == label_widget)
 370     return;
 371
 372   if (frame->label_widget)
 373     {
 374       need_resize = GTK_WIDGET_VISIBLE (frame->label_widget);
 375       gtk_widget_unparent (frame->label_widget);
 376     }
 377
 378   frame->label_widget = label_widget;
 379
 380   if (label_widget)
 381     {
 382       frame->label_widget = label_widget;
 383       gtk_widget_set_parent (label_widget, GTK_WIDGET (frame));
 384       need_resize |= GTK_WIDGET_VISIBLE (label_widget);
 385     }
 386
 387   if (GTK_WIDGET_VISIBLE (frame) && need_resize)
 388     gtk_widget_queue_resize (GTK_WIDGET (frame));
 389
 390   g_object_notify (G_OBJECT (frame), "label_widget");
 391 }
 392
 393 /**
 394  * gtk_frame_get_label_widget:
 395  * @frame: a #GtkFrame
 396  *
 397  * Retrieves the label widget for the frame. See
 398  * gtk_frame_set_label_widget().
 399  *
 400  * Return value: the label widget, or %NULL if there is none.
 401  **/
 402 GtkWidget *
 403 gtk_frame_get_label_widget (GtkFrame *frame)
 404 {
 405   g_return_val_if_fail (GTK_IS_FRAME (frame), NULL);
 406
 407   return frame->label_widget;
 408 }
 409
 410 void
 411 gtk_frame_set_label_align (GtkFrame *frame,
 412                            gfloat    xalign,
 413                            gfloat    yalign)
 414 {
 415   g_return_if_fail (GTK_IS_FRAME (frame));
 416
 417   xalign = CLAMP (xalign, 0.0, 1.0);
 418   yalign = CLAMP (yalign, 0.0, 1.0);
 419
 420   if (xalign != frame->label_xalign)
 421     {
 422       frame->label_xalign = xalign;
 423       g_object_notify (G_OBJECT (frame), "label_xalign");
 424     }
 425
 426   if (yalign != frame->label_yalign)
 427     {
 428       frame->label_yalign = yalign;
 429       g_object_notify (G_OBJECT (frame), "label_yalign");
 430     }
 431
 432   gtk_widget_queue_resize (GTK_WIDGET (frame));
 433 }
 434
 435 /**
 436  * gtk_frame_get_label_align:
 437  * @frame: a #GtkFrame
 438  * @xalign: location to store X alignment of frame's label, or %NULL
 439  * @yalign: location to store X alignment of frame's label, or %NULL
 440  *
 441  * Retrieves the X and Y alignment of the frame's label. See
 442  * gtk_frame_set_label_align().
 443  **/
 444 void
 445 gtk_frame_get_label_align (GtkFrame *frame,
 446                            gfloat   *xalign,
 447                            gfloat   *yalign)
 448 {
 449   g_return_if_fail (GTK_IS_FRAME (frame));
 450
 451   if (xalign)
 452     *xalign = frame->label_xalign;
 453   if (yalign)
 454     *yalign = frame->label_yalign;
 455 }
 456
 457 void
 458 gtk_frame_set_shadow_type (GtkFrame      *frame,
 459                            GtkShadowType  type)
 460 {
 461   g_return_if_fail (GTK_IS_FRAME (frame));
 462
 463   if ((GtkShadowType) frame->shadow_type != type)
 464     {
 465       frame->shadow_type = type;
 466       g_object_notify (G_OBJECT (frame), "shadow_type");
 467
 468       if (GTK_WIDGET_DRAWABLE (frame))
 469         {
 470           gtk_widget_queue_clear (GTK_WIDGET (frame));
 471         }
 472
 473       gtk_widget_queue_resize (GTK_WIDGET (frame));
 474     }
 475 }
 476
 477 /**
 478  * gtk_frame_get_shadow_type:
 479  * @frame: a #GtkFrame
 480  *
 481  * Retrieves the shadow type of the frame. See
 482  * gtk_frame_set_shadow_type().
 483  *
 484  * Return value: the current shadow type of the frame.
 485  **/
 486 GtkShadowType
 487 gtk_frame_get_shadow_type (GtkFrame *frame)
 488 {
 489   g_return_val_if_fail (GTK_IS_FRAME (frame), GTK_SHADOW_ETCHED_IN);
 490
 491   return frame->shadow_type;
 492 }
 493
 494 static void
 495 gtk_frame_paint (GtkWidget    *widget,
 496                  GdkRectangle *area)
 497 {
 498   GtkFrame *frame;
 499   gint x, y, width, height;
 500
 501   if (GTK_WIDGET_DRAWABLE (widget))
 502     {
 503       frame = GTK_FRAME (widget);
 504
 505       x = frame->child_allocation.x - widget->style->xthickness;
 506       y = frame->child_allocation.y - widget->style->ythickness;
 507       width = frame->child_allocation.width + 2 * widget->style->xthickness;
 508       height =  frame->child_allocation.height + 2 * widget->style->ythickness;
 509
 510       if (frame->label_widget)
 511         {
 512           GtkRequisition child_requisition;
 513           gfloat xalign;
 514           gint height_extra;
 515           gint x2;
 516
 517           gtk_widget_get_child_requisition (frame->label_widget, &child_requisition);
 518
 519           if (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_LTR)
 520             xalign = frame->label_xalign;
 521           else
 522             xalign = 1 - frame->label_xalign;
 523
 524           height_extra = MAX (0, child_requisition.height - widget->style->xthickness);
 525           y -= height_extra * (1 - frame->label_yalign);
 526           height += height_extra * (1 - frame->label_yalign);
 527
 528           x2 = widget->style->xthickness + (frame->child_allocation.width - child_requisition.width - 2 * LABEL_PAD - 2 * LABEL_SIDE_PAD) * xalign + LABEL_SIDE_PAD;
 529
 530
 531           gtk_paint_shadow_gap (widget->style, widget->window,
 532                                 GTK_STATE_NORMAL, frame->shadow_type,
 533                                 area, widget, "frame",
 534                                 x, y, width, height,
 535                                 GTK_POS_TOP,
 536                                 x2, child_requisition.width + 2 * LABEL_PAD);
 537         }
 538        else
 539          gtk_paint_shadow (widget->style, widget->window,
 540                            GTK_STATE_NORMAL, frame->shadow_type,
 541                            area, widget, "frame",
 542                            x, y, width, height);
 543     }
 544 }
 545
 546 static gboolean
 547 gtk_frame_expose (GtkWidget      *widget,
 548                   GdkEventExpose *event)
 549 {
 550   if (GTK_WIDGET_DRAWABLE (widget))
 551     {
 552       gtk_frame_paint (widget, &event->area);
 553
 554       (* GTK_WIDGET_CLASS (parent_class)->expose_event) (widget, event);
 555     }
 556
 557   return FALSE;
 558 }
 559
 560 static void
 561 gtk_frame_size_request (GtkWidget      *widget,
 562                         GtkRequisition *requisition)
 563 {
 564   GtkFrame *frame = GTK_FRAME (widget);
 565   GtkBin *bin = GTK_BIN (widget);
 566   GtkRequisition child_requisition;
 567
 568   if (frame->label_widget && GTK_WIDGET_VISIBLE (frame->label_widget))
 569     {
 570       gtk_widget_size_request (frame->label_widget, &child_requisition);
 571
 572       requisition->width = child_requisition.width + 2 * LABEL_PAD + 2 * LABEL_SIDE_PAD;
 573       requisition->height =
 574         MAX (0, child_requisition.height - GTK_WIDGET (widget)->style->xthickness);
 575     }
 576   else
 577     {
 578       requisition->width = 0;
 579       requisition->height = 0;
 580     }
 581
 582   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 583     {
 584       gtk_widget_size_request (bin->child, &child_requisition);
 585
 586       requisition->width = MAX (requisition->width, child_requisition.width);
 587       requisition->height += child_requisition.height;
 588     }
 589
 590   requisition->width += (GTK_CONTAINER (widget)->border_width +
 591                          GTK_WIDGET (widget)->style->xthickness) * 2;
 592   requisition->height += (GTK_CONTAINER (widget)->border_width +
 593                           GTK_WIDGET (widget)->style->ythickness) * 2;
 594 }
 595
 596 static void
 597 gtk_frame_size_allocate (GtkWidget     *widget,
 598                          GtkAllocation *allocation)
 599 {
 600   GtkFrame *frame = GTK_FRAME (widget);
 601   GtkBin *bin = GTK_BIN (widget);
 602   GtkAllocation new_allocation;
 603
 604   widget->allocation = *allocation;
 605
 606   gtk_frame_compute_child_allocation (frame, &new_allocation);
 607
 608   /* If the child allocation changed, that means that the frame is drawn
 609    * in a new place, so we must redraw the entire widget.
 610    */
 611   if (GTK_WIDGET_MAPPED (widget) &&
 612       (new_allocation.x != frame->child_allocation.x ||
 613        new_allocation.y != frame->child_allocation.y ||
 614        new_allocation.width != frame->child_allocation.width ||
 615        new_allocation.height != frame->child_allocation.height))
 616     gdk_window_invalidate_rect (widget->window, &widget->allocation, FALSE);
 617
 618   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 619     gtk_widget_size_allocate (bin->child, &new_allocation);
 620
 621   frame->child_allocation = new_allocation;
 622
 623   if (frame->label_widget && GTK_WIDGET_VISIBLE (frame->label_widget))
 624     {
 625       GtkRequisition child_requisition;
 626       GtkAllocation child_allocation;
 627       gfloat xalign;
 628
 629       gtk_widget_get_child_requisition (frame->label_widget, &child_requisition);
 630
 631       if (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_LTR)
 632         xalign = frame->label_xalign;
 633       else
 634         xalign = 1 - frame->label_xalign;
 635
 636       child_allocation.x = frame->child_allocation.x + LABEL_SIDE_PAD +
 637         (frame->child_allocation.width - child_requisition.width - 2 * LABEL_PAD - 2 * LABEL_SIDE_PAD) * xalign + LABEL_PAD;
 638       child_allocation.width = child_requisition.width;
 639
 640       child_allocation.y = frame->child_allocation.y - child_requisition.height;
 641       child_allocation.height = child_requisition.height;
 642
 643       gtk_widget_size_allocate (frame->label_widget, &child_allocation);
 644     }
 645 }
 646
 647 static void
 648 gtk_frame_compute_child_allocation (GtkFrame      *frame,
 649                                     GtkAllocation *child_allocation)
 650 {
 651   g_return_if_fail (GTK_IS_FRAME (frame));
 652   g_return_if_fail (child_allocation != NULL);
 653
 654   GTK_FRAME_GET_CLASS (frame)->compute_child_allocation (frame, child_allocation);
 655 }
 656
 657 static void
 658 gtk_frame_real_compute_child_allocation (GtkFrame      *frame,
 659                                          GtkAllocation *child_allocation)
 660 {
 661   GtkWidget *widget = GTK_WIDGET (frame);
 662   GtkAllocation *allocation = &widget->allocation;
 663   GtkRequisition child_requisition;
 664   gint top_margin;
 665
 666   if (frame->label_widget)
 667     {
 668       gtk_widget_get_child_requisition (frame->label_widget, &child_requisition);
 669       top_margin = MAX (child_requisition.height, widget->style->ythickness);
 670     }
 671   else
 672     top_margin = widget->style->ythickness;
 673
 674   child_allocation->x = (GTK_CONTAINER (frame)->border_width +
 675                          widget->style->xthickness);
 676   child_allocation->width = MAX(1, (gint)allocation->width - child_allocation->x * 2);
 677
 678   child_allocation->y = (GTK_CONTAINER (frame)->border_width + top_margin);
 679   child_allocation->height = MAX (1, ((gint)allocation->height - child_allocation->y -
 680                                       (gint)GTK_CONTAINER (frame)->border_width -
 681                                       (gint)widget->style->ythickness));
 682
 683   child_allocation->x += allocation->x;
 684   child_allocation->y += allocation->y;
 685 }