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 GType
  80 gtk_frame_get_type (void)
  81 {
  82   static GType frame_type = 0;
  83
  84   if (!frame_type)
  85     {
  86       static const GTypeInfo frame_info =
  87       {
  88         sizeof (GtkFrameClass),
  89         NULL,           /* base_init */
  90         NULL,           /* base_finalize */
  91         (GClassInitFunc) gtk_frame_class_init,
  92         NULL,           /* class_finalize */
  93         NULL,           /* class_data */
  94         sizeof (GtkFrame),
  95         0,              /* n_preallocs */
  96         (GInstanceInitFunc) gtk_frame_init,
  97       };
  98
  99       frame_type = g_type_register_static (GTK_TYPE_BIN, "GtkFrame",
 100                                            &frame_info, 0);
 101     }
 102
 103   return frame_type;
 104 }
 105
 106 static void
 107 gtk_frame_class_init (GtkFrameClass *class)
 108 {
 109   GObjectClass *gobject_class;
 110   GtkWidgetClass *widget_class;
 111   GtkContainerClass *container_class;
 112
 113   gobject_class = (GObjectClass*) class;
 114   widget_class = GTK_WIDGET_CLASS (class);
 115   container_class = GTK_CONTAINER_CLASS (class);
 116
 117   parent_class = g_type_class_peek_parent (class);
 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_float ("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_float ("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_float (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_float (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_float (value, frame->label_xalign);
 246       break;
 247     case PROP_LABEL_YALIGN:
 248       g_value_set_float (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   return g_object_new (GTK_TYPE_FRAME, "label", label, NULL);
 269 }
 270
 271 static void
 272 gtk_frame_remove (GtkContainer *container,
 273                   GtkWidget    *child)
 274 {
 275   GtkFrame *frame = GTK_FRAME (container);
 276
 277   if (frame->label_widget == child)
 278     gtk_frame_set_label_widget (frame, NULL);
 279   else
 280     GTK_CONTAINER_CLASS (parent_class)->remove (container, child);
 281 }
 282
 283 static void
 284 gtk_frame_forall (GtkContainer *container,
 285                   gboolean      include_internals,
 286                   GtkCallback   callback,
 287                   gpointer      callback_data)
 288 {
 289   GtkBin *bin = GTK_BIN (container);
 290   GtkFrame *frame = GTK_FRAME (container);
 291
 292   if (bin->child)
 293     (* callback) (bin->child, callback_data);
 294
 295   if (frame->label_widget)
 296     (* callback) (frame->label_widget, callback_data);
 297 }
 298
 299 void
 300 gtk_frame_set_label (GtkFrame *frame,
 301                      const gchar *label)
 302 {
 303   g_return_if_fail (GTK_IS_FRAME (frame));
 304
 305   if (!label)
 306     {
 307       gtk_frame_set_label_widget (frame, NULL);
 308     }
 309   else
 310     {
 311       GtkWidget *child = gtk_label_new (label);
 312       gtk_widget_show (child);
 313
 314       gtk_frame_set_label_widget (frame, child);
 315     }
 316 }
 317
 318 /**
 319  * gtk_frame_get_label:
 320  * @frame: a #GtkFrame
 321  *
 322  * If the frame's label widget is a #GtkLabel, return the
 323  * text in the label widget. (The frame will have a #GtkLabel
 324  * for the label widget if a non-%NULL argument was passed
 325  * to gtk_frame_new().)
 326  *
 327  * Return value: the text in the label, or %NULL if there
 328  *               was no label widget or the lable widget was not
 329  *               a #GtkLabel. This string is owned by GTK+ and
 330  *               must not be modified or freed.
 331  **/
 332 G_CONST_RETURN gchar *
 333 gtk_frame_get_label (GtkFrame *frame)
 334 {
 335   g_return_val_if_fail (GTK_IS_FRAME (frame), NULL);
 336
 337   if (frame->label_widget && GTK_IS_LABEL (frame->label_widget))
 338     return gtk_label_get_text (GTK_LABEL (frame->label_widget));
 339   else
 340     return NULL;
 341 }
 342
 343 /**
 344  * gtk_frame_set_label_widget:
 345  * @frame: a #GtkFrame
 346  * @label_widget: the new label widget
 347  *
 348  * Set the label widget for the frame. This is the widget that
 349  * will appear embedded in the top edge of the frame as a
 350  * title.
 351  **/
 352 void
 353 gtk_frame_set_label_widget (GtkFrame  *frame,
 354                             GtkWidget *label_widget)
 355 {
 356   gboolean need_resize = FALSE;
 357
 358   g_return_if_fail (GTK_IS_FRAME (frame));
 359   g_return_if_fail (label_widget == NULL || GTK_IS_WIDGET (label_widget));
 360   g_return_if_fail (label_widget == NULL || label_widget->parent == NULL);
 361
 362   if (frame->label_widget == label_widget)
 363     return;
 364
 365   if (frame->label_widget)
 366     {
 367       need_resize = GTK_WIDGET_VISIBLE (frame->label_widget);
 368       gtk_widget_unparent (frame->label_widget);
 369     }
 370
 371   frame->label_widget = label_widget;
 372
 373   if (label_widget)
 374     {
 375       frame->label_widget = label_widget;
 376       gtk_widget_set_parent (label_widget, GTK_WIDGET (frame));
 377       need_resize |= GTK_WIDGET_VISIBLE (label_widget);
 378     }
 379
 380   if (GTK_WIDGET_VISIBLE (frame) && need_resize)
 381     gtk_widget_queue_resize (GTK_WIDGET (frame));
 382
 383   g_object_freeze_notify (G_OBJECT (frame));
 384   g_object_notify (G_OBJECT (frame), "label_widget");
 385   g_object_notify (G_OBJECT (frame), "label");
 386   g_object_thaw_notify (G_OBJECT (frame));
 387 }
 388
 389 /**
 390  * gtk_frame_get_label_widget:
 391  * @frame: a #GtkFrame
 392  *
 393  * Retrieves the label widget for the frame. See
 394  * gtk_frame_set_label_widget().
 395  *
 396  * Return value: the label widget, or %NULL if there is none.
 397  **/
 398 GtkWidget *
 399 gtk_frame_get_label_widget (GtkFrame *frame)
 400 {
 401   g_return_val_if_fail (GTK_IS_FRAME (frame), NULL);
 402
 403   return frame->label_widget;
 404 }
 405
 406 void
 407 gtk_frame_set_label_align (GtkFrame *frame,
 408                            gfloat    xalign,
 409                            gfloat    yalign)
 410 {
 411   g_return_if_fail (GTK_IS_FRAME (frame));
 412
 413   xalign = CLAMP (xalign, 0.0, 1.0);
 414   yalign = CLAMP (yalign, 0.0, 1.0);
 415
 416   g_object_freeze_notify (G_OBJECT (frame));
 417   if (xalign != frame->label_xalign)
 418     {
 419       frame->label_xalign = xalign;
 420       g_object_notify (G_OBJECT (frame), "label_xalign");
 421     }
 422
 423   if (yalign != frame->label_yalign)
 424     {
 425       frame->label_yalign = yalign;
 426       g_object_notify (G_OBJECT (frame), "label_yalign");
 427     }
 428
 429   g_object_thaw_notify (G_OBJECT (frame));
 430   gtk_widget_queue_resize (GTK_WIDGET (frame));
 431 }
 432
 433 /**
 434  * gtk_frame_get_label_align:
 435  * @frame: a #GtkFrame
 436  * @xalign: location to store X alignment of frame's label, or %NULL
 437  * @yalign: location to store X alignment of frame's label, or %NULL
 438  *
 439  * Retrieves the X and Y alignment of the frame's label. See
 440  * gtk_frame_set_label_align().
 441  **/
 442 void
 443 gtk_frame_get_label_align (GtkFrame *frame,
 444                            gfloat   *xalign,
 445                            gfloat   *yalign)
 446 {
 447   g_return_if_fail (GTK_IS_FRAME (frame));
 448
 449   if (xalign)
 450     *xalign = frame->label_xalign;
 451   if (yalign)
 452     *yalign = frame->label_yalign;
 453 }
 454
 455 void
 456 gtk_frame_set_shadow_type (GtkFrame      *frame,
 457                            GtkShadowType  type)
 458 {
 459   g_return_if_fail (GTK_IS_FRAME (frame));
 460
 461   if ((GtkShadowType) frame->shadow_type != type)
 462     {
 463       frame->shadow_type = type;
 464       g_object_notify (G_OBJECT (frame), "shadow_type");
 465
 466       if (GTK_WIDGET_DRAWABLE (frame))
 467         {
 468           gtk_widget_queue_draw (GTK_WIDGET (frame));
 469         }
 470
 471       gtk_widget_queue_resize (GTK_WIDGET (frame));
 472     }
 473 }
 474
 475 /**
 476  * gtk_frame_get_shadow_type:
 477  * @frame: a #GtkFrame
 478  *
 479  * Retrieves the shadow type of the frame. See
 480  * gtk_frame_set_shadow_type().
 481  *
 482  * Return value: the current shadow type of the frame.
 483  **/
 484 GtkShadowType
 485 gtk_frame_get_shadow_type (GtkFrame *frame)
 486 {
 487   g_return_val_if_fail (GTK_IS_FRAME (frame), GTK_SHADOW_ETCHED_IN);
 488
 489   return frame->shadow_type;
 490 }
 491
 492 static void
 493 gtk_frame_paint (GtkWidget    *widget,
 494                  GdkRectangle *area)
 495 {
 496   GtkFrame *frame;
 497   gint x, y, width, height;
 498
 499   if (GTK_WIDGET_DRAWABLE (widget))
 500     {
 501       frame = GTK_FRAME (widget);
 502
 503       x = frame->child_allocation.x - widget->style->xthickness;
 504       y = frame->child_allocation.y - widget->style->ythickness;
 505       width = frame->child_allocation.width + 2 * widget->style->xthickness;
 506       height =  frame->child_allocation.height + 2 * widget->style->ythickness;
 507
 508       if (frame->label_widget)
 509         {
 510           GtkRequisition child_requisition;
 511           gfloat xalign;
 512           gint height_extra;
 513           gint x2;
 514
 515           gtk_widget_get_child_requisition (frame->label_widget, &child_requisition);
 516
 517           if (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_LTR)
 518             xalign = frame->label_xalign;
 519           else
 520             xalign = 1 - frame->label_xalign;
 521
 522           height_extra = MAX (0, child_requisition.height - widget->style->xthickness);
 523           y -= height_extra * (1 - frame->label_yalign);
 524           height += height_extra * (1 - frame->label_yalign);
 525
 526           x2 = widget->style->xthickness + (frame->child_allocation.width - child_requisition.width - 2 * LABEL_PAD - 2 * LABEL_SIDE_PAD) * xalign + LABEL_SIDE_PAD;
 527
 528
 529           gtk_paint_shadow_gap (widget->style, widget->window,
 530                                 GTK_STATE_NORMAL, frame->shadow_type,
 531                                 area, widget, "frame",
 532                                 x, y, width, height,
 533                                 GTK_POS_TOP,
 534                                 x2, child_requisition.width + 2 * LABEL_PAD);
 535         }
 536        else
 537          gtk_paint_shadow (widget->style, widget->window,
 538                            GTK_STATE_NORMAL, frame->shadow_type,
 539                            area, widget, "frame",
 540                            x, y, width, height);
 541     }
 542 }
 543
 544 static gboolean
 545 gtk_frame_expose (GtkWidget      *widget,
 546                   GdkEventExpose *event)
 547 {
 548   if (GTK_WIDGET_DRAWABLE (widget))
 549     {
 550       gtk_frame_paint (widget, &event->area);
 551
 552       (* GTK_WIDGET_CLASS (parent_class)->expose_event) (widget, event);
 553     }
 554
 555   return FALSE;
 556 }
 557
 558 static void
 559 gtk_frame_size_request (GtkWidget      *widget,
 560                         GtkRequisition *requisition)
 561 {
 562   GtkFrame *frame = GTK_FRAME (widget);
 563   GtkBin *bin = GTK_BIN (widget);
 564   GtkRequisition child_requisition;
 565
 566   if (frame->label_widget && GTK_WIDGET_VISIBLE (frame->label_widget))
 567     {
 568       gtk_widget_size_request (frame->label_widget, &child_requisition);
 569
 570       requisition->width = child_requisition.width + 2 * LABEL_PAD + 2 * LABEL_SIDE_PAD;
 571       requisition->height =
 572         MAX (0, child_requisition.height - GTK_WIDGET (widget)->style->xthickness);
 573     }
 574   else
 575     {
 576       requisition->width = 0;
 577       requisition->height = 0;
 578     }
 579
 580   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 581     {
 582       gtk_widget_size_request (bin->child, &child_requisition);
 583
 584       requisition->width = MAX (requisition->width, child_requisition.width);
 585       requisition->height += child_requisition.height;
 586     }
 587
 588   requisition->width += (GTK_CONTAINER (widget)->border_width +
 589                          GTK_WIDGET (widget)->style->xthickness) * 2;
 590   requisition->height += (GTK_CONTAINER (widget)->border_width +
 591                           GTK_WIDGET (widget)->style->ythickness) * 2;
 592 }
 593
 594 static void
 595 gtk_frame_size_allocate (GtkWidget     *widget,
 596                          GtkAllocation *allocation)
 597 {
 598   GtkFrame *frame = GTK_FRAME (widget);
 599   GtkBin *bin = GTK_BIN (widget);
 600   GtkAllocation new_allocation;
 601
 602   widget->allocation = *allocation;
 603
 604   gtk_frame_compute_child_allocation (frame, &new_allocation);
 605
 606   /* If the child allocation changed, that means that the frame is drawn
 607    * in a new place, so we must redraw the entire widget.
 608    */
 609   if (GTK_WIDGET_MAPPED (widget) &&
 610       (new_allocation.x != frame->child_allocation.x ||
 611        new_allocation.y != frame->child_allocation.y ||
 612        new_allocation.width != frame->child_allocation.width ||
 613        new_allocation.height != frame->child_allocation.height))
 614     gdk_window_invalidate_rect (widget->window, &widget->allocation, FALSE);
 615
 616   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 617     gtk_widget_size_allocate (bin->child, &new_allocation);
 618
 619   frame->child_allocation = new_allocation;
 620
 621   if (frame->label_widget && GTK_WIDGET_VISIBLE (frame->label_widget))
 622     {
 623       GtkRequisition child_requisition;
 624       GtkAllocation child_allocation;
 625       gfloat xalign;
 626
 627       gtk_widget_get_child_requisition (frame->label_widget, &child_requisition);
 628
 629       if (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_LTR)
 630         xalign = frame->label_xalign;
 631       else
 632         xalign = 1 - frame->label_xalign;
 633
 634       child_allocation.x = frame->child_allocation.x + LABEL_SIDE_PAD +
 635         (frame->child_allocation.width - child_requisition.width - 2 * LABEL_PAD - 2 * LABEL_SIDE_PAD) * xalign + LABEL_PAD;
 636       child_allocation.width = child_requisition.width;
 637
 638       child_allocation.y = frame->child_allocation.y - child_requisition.height;
 639       child_allocation.height = child_requisition.height;
 640
 641       gtk_widget_size_allocate (frame->label_widget, &child_allocation);
 642     }
 643 }
 644
 645 static void
 646 gtk_frame_compute_child_allocation (GtkFrame      *frame,
 647                                     GtkAllocation *child_allocation)
 648 {
 649   g_return_if_fail (GTK_IS_FRAME (frame));
 650   g_return_if_fail (child_allocation != NULL);
 651
 652   GTK_FRAME_GET_CLASS (frame)->compute_child_allocation (frame, child_allocation);
 653 }
 654
 655 static void
 656 gtk_frame_real_compute_child_allocation (GtkFrame      *frame,
 657                                          GtkAllocation *child_allocation)
 658 {
 659   GtkWidget *widget = GTK_WIDGET (frame);
 660   GtkAllocation *allocation = &widget->allocation;
 661   GtkRequisition child_requisition;
 662   gint top_margin;
 663
 664   if (frame->label_widget)
 665     {
 666       gtk_widget_get_child_requisition (frame->label_widget, &child_requisition);
 667       top_margin = MAX (child_requisition.height, widget->style->ythickness);
 668     }
 669   else
 670     top_margin = widget->style->ythickness;
 671
 672   child_allocation->x = (GTK_CONTAINER (frame)->border_width +
 673                          widget->style->xthickness);
 674   child_allocation->width = MAX(1, (gint)allocation->width - child_allocation->x * 2);
 675
 676   child_allocation->y = (GTK_CONTAINER (frame)->border_width + top_margin);
 677   child_allocation->height = MAX (1, ((gint)allocation->height - child_allocation->y -
 678                                       (gint)GTK_CONTAINER (frame)->border_width -
 679                                       (gint)widget->style->ythickness));
 680
 681   child_allocation->x += allocation->x;
 682   child_allocation->y += allocation->y;
 683 }