[gtk+] Support GtkWidget expand properties in GtkNotebook

[Matthias Clasen <matthiasc src gnome org>]

commit 7791013754b64728d7bfe707c4a51abf0051813f
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Oct 11 15:23:03 2010 -0400

    Support GtkWidget expand properties in GtkNotebook
    
    We expand a tab if either tab-expand is set, or the generic widget
    expand property in the correct direction is set. And we do not
    propagate expand flags from tab labels to the notebook, only
    the expand flags from the pages.

 gtk/gtknotebook.c |   50 ++++++++++++++++++++++++++++++++++++++++++++++++--
 1 files changed, 48 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtknotebook.c b/gtk/gtknotebook.c
index beb19d8..b8a0997 100644
--- a/gtk/gtknotebook.c
+++ b/gtk/gtknotebook.c
@@ -587,6 +587,39 @@ gtk_object_handled_accumulator (GSignalInvocationHint *ihint,
 }
 
 static void
+gtk_notebook_compute_expand (GtkContainer *container,
+                             gboolean     *hexpand_p,
+                             gboolean     *vexpand_p)
+{
+  GtkNotebook *notebook = GTK_NOTEBOOK (container);
+  GtkNotebookPrivate *priv = notebook->priv;
+  gboolean hexpand;
+  gboolean vexpand;
+  GList *list;
+  GtkNotebookPage *page;
+
+  hexpand = FALSE;
+  vexpand = FALSE;
+
+  for (list = priv->children; list; list = list->next)
+    {
+      page = list->data;
+
+      hexpand = hexpand ||
+        gtk_widget_compute_expand (page->child, GTK_ORIENTATION_HORIZONTAL);
+
+      vexpand = vexpand ||
+        gtk_widget_compute_expand (page->child, GTK_ORIENTATION_VERTICAL);
+
+      if (hexpand & vexpand)
+        break;
+    }
+
+  *hexpand_p = hexpand;
+  *vexpand_p = vexpand;
+}
+
+static void
 gtk_notebook_class_init (GtkNotebookClass *class)
 {
   GObjectClass   *gobject_class = G_OBJECT_CLASS (class);
@@ -623,6 +656,7 @@ gtk_notebook_class_init (GtkNotebookClass *class)
   widget_class->drag_drop = gtk_notebook_drag_drop;
   widget_class->drag_data_get = gtk_notebook_drag_data_get;
   widget_class->drag_data_received = gtk_notebook_drag_data_received;
+  widget_class->compute_expand = gtk_notebook_compute_expand;
 
   container_class->add = gtk_notebook_add;
   container_class->remove = gtk_notebook_remove;
@@ -5423,9 +5457,14 @@ gtk_notebook_calculate_shown_tabs (GtkNotebook *notebook,
     }
   else /* !show_arrows */
     {
+      GtkOrientation tab_expand_orientation;
       gint c = 0;
       *n = 0;
 
+      if (priv->tab_pos == GTK_POS_TOP || priv->tab_pos == GTK_POS_BOTTOM)
+        tab_expand_orientation = GTK_ORIENTATION_HORIZONTAL;
+      else
+        tab_expand_orientation = GTK_ORIENTATION_VERTICAL;
       *remaining_space = max - min - tab_overlap - tab_space;
       children = priv->children;
       priv->first_tab = gtk_notebook_search_page (notebook, NULL,
@@ -5441,7 +5480,8 @@ gtk_notebook_calculate_shown_tabs (GtkNotebook *notebook,
 
 	  c++;
 
-	  if (page->expand)
+	  if (page->expand ||
+              (gtk_widget_compute_expand (page->tab_label, tab_expand_orientation)))
 	    (*n)++;
 	}
 
@@ -5501,6 +5541,7 @@ gtk_notebook_calculate_tabs_allocation (GtkNotebook  *notebook,
   guint border_width;
   gboolean gap_left, packing_changed;
   GtkAllocation child_allocation = { 0, };
+  GtkOrientation tab_expand_orientation;
 
   widget = GTK_WIDGET (notebook);
   container = GTK_CONTAINER (notebook);
@@ -5550,6 +5591,11 @@ gtk_notebook_calculate_tabs_allocation (GtkNotebook  *notebook,
   bottom_y = top_y + priv->cur_page->allocation.height;
   gap_left = packing_changed = FALSE;
 
+  if (priv->tab_pos == GTK_POS_TOP || priv->tab_pos == GTK_POS_BOTTOM)
+    tab_expand_orientation = GTK_ORIENTATION_HORIZONTAL;
+  else
+    tab_expand_orientation = GTK_ORIENTATION_VERTICAL;
+
   while (*children && *children != last_child)
     {
       page = (*children)->data;
@@ -5576,7 +5622,7 @@ gtk_notebook_calculate_tabs_allocation (GtkNotebook  *notebook,
 	continue;
 
       tab_extra_space = 0;
-      if (*expanded_tabs && (showarrow || page->expand || priv->homogeneous))
+      if (*expanded_tabs && (showarrow || page->expand || gtk_widget_compute_expand (page->tab_label, tab_expand_orientation) || priv->homogeneous))
 	{
 	  tab_extra_space = *remaining_space / *expanded_tabs;
 	  *remaining_space -= tab_extra_space;