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