[evolution/wip/gsettings] Limit the size of tab labels to a reasonable size

[Rodrigo Moya <rodrigo src gnome org>]

commit ad593d8365ec053bc2f421aeeaa6d3de292f33e6
Author: Gustavo Noronha Silva <gustavo noronha collabora com>
Date:   Tue Jun 21 09:53:55 2011 -0300

    Limit the size of tab labels to a reasonable size
    
    We use half the size allocated to the whole view as a reference, and
    force the label to be at most that size, taking advantage of ellipsis
    otherwise. Notice that we also force the natural size as the requested
    size if it is not too big as well, because labels ellipsisized using
    the minimum size usually, which is undesired.
    
    This is a fix for https://bugs.meego.com/show_bug.cgi?id=18313

 mail/e-mail-notebook-view.c |   41 +++++++++++++++++++++++++++++++++++++++++
 1 files changed, 41 insertions(+), 0 deletions(-)
---
diff --git a/mail/e-mail-notebook-view.c b/mail/e-mail-notebook-view.c
index 544902d..c4e0ed3 100644
--- a/mail/e-mail-notebook-view.c
+++ b/mail/e-mail-notebook-view.c
@@ -368,21 +368,62 @@ tab_remove_gtk_cb (GtkWidget *button,
 
 }
 
+static void
+adjust_label_size_request (GtkWidget *view,
+			   GtkAllocation *allocation,
+			   GtkWidget *label)
+{
+	GtkRequisition requisition;
+	int max_width = allocation->width / 2;
+
+	/* We make sure the label is not over-ellipisized, but doesn't
+	 * get too big to cause the tab to not fit either. */
+	gtk_widget_get_preferred_size (label, NULL, &requisition);
+	if (requisition.width < max_width)
+		gtk_widget_set_size_request (label, requisition.width, -1);
+	else
+		gtk_widget_set_size_request (label, max_width, -1);
+}
+
+static void
+disconnect_label_adjusting (EMailNotebookView *view,
+			    GtkWidget *label)
+{
+	g_signal_handlers_disconnect_by_func (
+		view,
+		adjust_label_size_request,
+		label);
+}
+
 static GtkWidget *
 create_tab_label (EMailNotebookView *view,
 		  EMailView *page,
 		  const gchar *str)
 {
 	GtkWidget *container, *widget;
+	GtkAllocation allocation;
 
 	widget = gtk_hbox_new (FALSE, 0);
 	gtk_widget_show (widget);
 	container = widget;
 
 	widget = gtk_label_new (str);
+	gtk_label_set_ellipsize (GTK_LABEL (widget), PANGO_ELLIPSIZE_END);
 	gtk_widget_show (widget);
 	gtk_box_pack_start (GTK_BOX (container), widget, TRUE, FALSE, 0);
 
+	gtk_widget_get_allocation (GTK_WIDGET (view), &allocation);
+	adjust_label_size_request (GTK_WIDGET (view), &allocation, widget);
+
+	g_signal_connect (
+		view, "size-allocate",
+		G_CALLBACK (adjust_label_size_request), widget);
+
+	g_object_weak_ref (
+		G_OBJECT (widget),
+		(GWeakNotify) disconnect_label_adjusting,
+		view);
+
 	widget = gtk_button_new ();
 	gtk_button_set_relief (GTK_BUTTON (widget), GTK_RELIEF_NONE);
 	gtk_button_set_image (