Pileus Git - ~andy/gtk/blob - gtk/gtkvbox.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  * Modified by the GTK+ Team and others 1997-1999.  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 "gtkvbox.h"
  28
  29
  30 static void gtk_vbox_class_init    (GtkVBoxClass   *klass);
  31 static void gtk_vbox_init          (GtkVBox        *box);
  32 static void gtk_vbox_size_request  (GtkWidget      *widget,
  33                                     GtkRequisition *requisition);
  34 static void gtk_vbox_size_allocate (GtkWidget      *widget,
  35                                     GtkAllocation  *allocation);
  36
  37
  38 GtkType
  39 gtk_vbox_get_type (void)
  40 {
  41   static GtkType vbox_type = 0;
  42
  43   if (!vbox_type)
  44     {
  45       static const GtkTypeInfo vbox_info =
  46       {
  47         "GtkVBox",
  48         sizeof (GtkVBox),
  49         sizeof (GtkVBoxClass),
  50         (GtkClassInitFunc) gtk_vbox_class_init,
  51         (GtkObjectInitFunc) gtk_vbox_init,
  52         /* reserved_1 */ NULL,
  53         /* reserved_2 */ NULL,
  54         (GtkClassInitFunc) NULL,
  55       };
  56
  57       vbox_type = gtk_type_unique (GTK_TYPE_BOX, &vbox_info);
  58     }
  59
  60   return vbox_type;
  61 }
  62
  63 static void
  64 gtk_vbox_class_init (GtkVBoxClass *class)
  65 {
  66   GtkWidgetClass *widget_class;
  67
  68   widget_class = (GtkWidgetClass*) class;
  69
  70   widget_class->size_request = gtk_vbox_size_request;
  71   widget_class->size_allocate = gtk_vbox_size_allocate;
  72 }
  73
  74 static void
  75 gtk_vbox_init (GtkVBox *vbox)
  76 {
  77 }
  78
  79 GtkWidget*
  80 gtk_vbox_new (gboolean homogeneous,
  81               gint spacing)
  82 {
  83   GtkVBox *vbox;
  84
  85   vbox = gtk_type_new (gtk_vbox_get_type ());
  86
  87   GTK_BOX (vbox)->spacing = spacing;
  88   GTK_BOX (vbox)->homogeneous = homogeneous ? TRUE : FALSE;
  89
  90   return GTK_WIDGET (vbox);
  91 }
  92
  93
  94 static void
  95 gtk_vbox_size_request (GtkWidget      *widget,
  96                        GtkRequisition *requisition)
  97 {
  98   GtkBox *box;
  99   GtkBoxChild *child;
 100   GtkRequisition child_requisition;
 101   GList *children;
 102   gint nvis_children;
 103   gint height;
 104
 105   g_return_if_fail (widget != NULL);
 106   g_return_if_fail (GTK_IS_VBOX (widget));
 107   g_return_if_fail (requisition != NULL);
 108
 109   box = GTK_BOX (widget);
 110   requisition->width = 0;
 111   requisition->height = 0;
 112   nvis_children = 0;
 113
 114   children = box->children;
 115   while (children)
 116     {
 117       child = children->data;
 118       children = children->next;
 119
 120       if (GTK_WIDGET_VISIBLE (child->widget))
 121         {
 122           gtk_widget_size_request (child->widget, &child_requisition);
 123
 124           if (box->homogeneous)
 125             {
 126               height = child_requisition.height + child->padding * 2;
 127               requisition->height = MAX (requisition->height, height);
 128             }
 129           else
 130             {
 131               requisition->height += child_requisition.height + child->padding * 2;
 132             }
 133
 134           requisition->width = MAX (requisition->width, child_requisition.width);
 135
 136           nvis_children += 1;
 137         }
 138     }
 139
 140   if (nvis_children > 0)
 141     {
 142       if (box->homogeneous)
 143         requisition->height *= nvis_children;
 144       requisition->height += (nvis_children - 1) * box->spacing;
 145     }
 146
 147   requisition->width += GTK_CONTAINER (box)->border_width * 2;
 148   requisition->height += GTK_CONTAINER (box)->border_width * 2;
 149 }
 150
 151 static void
 152 gtk_vbox_size_allocate (GtkWidget     *widget,
 153                         GtkAllocation *allocation)
 154 {
 155   GtkBox *box;
 156   GtkBoxChild *child;
 157   GList *children;
 158   GtkAllocation child_allocation;
 159   gint nvis_children;
 160   gint nexpand_children;
 161   gint child_height;
 162   gint height;
 163   gint extra;
 164   gint y;
 165
 166   g_return_if_fail (widget != NULL);
 167   g_return_if_fail (GTK_IS_VBOX (widget));
 168   g_return_if_fail (allocation != NULL);
 169
 170   box = GTK_BOX (widget);
 171   widget->allocation = *allocation;
 172
 173   nvis_children = 0;
 174   nexpand_children = 0;
 175   children = box->children;
 176
 177   while (children)
 178     {
 179       child = children->data;
 180       children = children->next;
 181
 182       if (GTK_WIDGET_VISIBLE (child->widget))
 183         {
 184           nvis_children += 1;
 185           if (child->expand)
 186             nexpand_children += 1;
 187         }
 188     }
 189
 190   if (nvis_children > 0)
 191     {
 192       if (box->homogeneous)
 193         {
 194           height = (allocation->height -
 195                    GTK_CONTAINER (box)->border_width * 2 -
 196                    (nvis_children - 1) * box->spacing);
 197           extra = height / nvis_children;
 198         }
 199       else if (nexpand_children > 0)
 200         {
 201           height = (gint) allocation->height - (gint) widget->requisition.height;
 202           extra = height / nexpand_children;
 203         }
 204       else
 205         {
 206           height = 0;
 207           extra = 0;
 208         }
 209
 210       y = allocation->y + GTK_CONTAINER (box)->border_width;
 211       child_allocation.x = allocation->x + GTK_CONTAINER (box)->border_width;
 212       child_allocation.width = MAX (1, (gint) allocation->width - (gint) GTK_CONTAINER (box)->border_width * 2);
 213
 214       children = box->children;
 215       while (children)
 216         {
 217           child = children->data;
 218           children = children->next;
 219
 220           if ((child->pack == GTK_PACK_START) && GTK_WIDGET_VISIBLE (child->widget))
 221             {
 222               if (box->homogeneous)
 223                 {
 224                   if (nvis_children == 1)
 225                     child_height = height;
 226                   else
 227                     child_height = extra;
 228
 229                   nvis_children -= 1;
 230                   height -= extra;
 231                 }
 232               else
 233                 {
 234                   GtkRequisition child_requisition;
 235
 236                   gtk_widget_get_child_requisition (child->widget, &child_requisition);
 237                   child_height = child_requisition.height + child->padding * 2;
 238
 239                   if (child->expand)
 240                     {
 241                       if (nexpand_children == 1)
 242                         child_height += height;
 243                       else
 244                         child_height += extra;
 245
 246                       nexpand_children -= 1;
 247                       height -= extra;
 248                     }
 249                 }
 250
 251               if (child->fill)
 252                 {
 253                   child_allocation.height = MAX (1, child_height - (gint)child->padding * 2);
 254                   child_allocation.y = y + child->padding;
 255                 }
 256               else
 257                 {
 258                   GtkRequisition child_requisition;
 259
 260                   gtk_widget_get_child_requisition (child->widget, &child_requisition);
 261                   child_allocation.height = child_requisition.height;
 262                   child_allocation.y = y + (child_height - child_allocation.height) / 2;
 263                 }
 264
 265               gtk_widget_size_allocate (child->widget, &child_allocation);
 266
 267               y += child_height + box->spacing;
 268             }
 269         }
 270
 271       y = allocation->y + allocation->height - GTK_CONTAINER (box)->border_width;
 272
 273       children = box->children;
 274       while (children)
 275         {
 276           child = children->data;
 277           children = children->next;
 278
 279           if ((child->pack == GTK_PACK_END) && GTK_WIDGET_VISIBLE (child->widget))
 280             {
 281               GtkRequisition child_requisition;
 282               gtk_widget_get_child_requisition (child->widget, &child_requisition);
 283
 284               if (box->homogeneous)
 285                 {
 286                   if (nvis_children == 1)
 287                     child_height = height;
 288                   else
 289                     child_height = extra;
 290
 291                   nvis_children -= 1;
 292                   height -= extra;
 293                 }
 294               else
 295                 {
 296                   child_height = child_requisition.height + child->padding * 2;
 297
 298                   if (child->expand)
 299                     {
 300                       if (nexpand_children == 1)
 301                         child_height += height;
 302                       else
 303                         child_height += extra;
 304
 305                       nexpand_children -= 1;
 306                       height -= extra;
 307                     }
 308                 }
 309
 310               if (child->fill)
 311                 {
 312                   child_allocation.height = MAX (1, child_height - (gint)child->padding * 2);
 313                   child_allocation.y = y + child->padding - child_height;
 314                 }
 315               else
 316                 {
 317                   child_allocation.height = child_requisition.height;
 318                   child_allocation.y = y + (child_height - child_allocation.height) / 2 - child_height;
 319                 }
 320
 321               gtk_widget_size_allocate (child->widget, &child_allocation);
 322
 323               y -= (child_height + box->spacing);
 324             }
 325         }
 326     }
 327 }