[evolution/relayout-composer] Hide the From header if only one account is set up

[Federico Mena Quintero <federico src gnome org>]

commit ac2ef9fb41e51292b379c6dee62dd765f783dae0
Author: Federico Mena Quintero <federico novell com>
Date:   Tue May 4 13:39:23 2010 -0500

    Hide the From header if only one account is set up
    
    This lets us save vertical space in the mail composer
    in the common case where the user has only a single
    email account configured - then he doesn't need to
    choose which account to send from.
    
    Signed-off-by: Federico Mena Quintero <federico novell com>

 composer/e-composer-header-table.c |   44 ++++++++++++++++++++++++++++-------
 1 files changed, 35 insertions(+), 9 deletions(-)
---
diff --git a/composer/e-composer-header-table.c b/composer/e-composer-header-table.c
index f8ea8df..8a252c6 100644
--- a/composer/e-composer-header-table.c
+++ b/composer/e-composer-header-table.c
@@ -276,6 +276,27 @@ skip_custom:
 	return new_destinations;
 }
 
+static int
+count_from_accounts (EComposerHeaderTable *table)
+{
+	EComposerHeader *header;
+	EAccountComboBox *combo_box;
+
+	header = e_composer_header_table_get_header (table, E_COMPOSER_HEADER_FROM);
+	combo_box = E_ACCOUNT_COMBO_BOX (header->input_widget);
+
+	return e_account_combo_box_count_displayed_accounts (combo_box);
+}
+
+static gboolean
+from_header_should_be_visible (EComposerHeaderTable *table)
+{
+	int num_accounts;
+
+	num_accounts = count_from_accounts (table);
+	return (num_accounts > 1);
+}
+
 static void
 composer_header_table_setup_mail_headers (EComposerHeaderTable *table)
 {
@@ -288,6 +309,8 @@ composer_header_table_setup_mail_headers (EComposerHeaderTable *table)
 		EComposerHeader *header;
 		const gchar *key;
 		guint binding_id;
+		gboolean sensitive;
+		gboolean visible;
 
 		binding_id = table->priv->gconf_bindings[ii];
 		header = e_composer_header_table_get_header (table, ii);
@@ -304,10 +327,6 @@ composer_header_table_setup_mail_headers (EComposerHeaderTable *table)
 				key = COMPOSER_GCONF_PREFIX "/show_mail_cc";
 				break;
 
-			case E_COMPOSER_HEADER_FROM:
-				key = COMPOSER_GCONF_PREFIX "/show_mail_from";
-				break;
-
 			case E_COMPOSER_HEADER_REPLY_TO:
 				key = COMPOSER_GCONF_PREFIX "/show_mail_reply_to";
 				break;
@@ -318,22 +337,29 @@ composer_header_table_setup_mail_headers (EComposerHeaderTable *table)
 		}
 
 		switch (ii) {
+			case E_COMPOSER_HEADER_FROM:
+				sensitive = TRUE;
+				visible = from_header_should_be_visible (table);
+				break;
+
 			case E_COMPOSER_HEADER_BCC:
 			case E_COMPOSER_HEADER_CC:
-			case E_COMPOSER_HEADER_FROM:
 			case E_COMPOSER_HEADER_REPLY_TO:
 			case E_COMPOSER_HEADER_SUBJECT:
 			case E_COMPOSER_HEADER_TO:
-				e_composer_header_set_sensitive (header, TRUE);
-				e_composer_header_set_visible (header, TRUE);
+				sensitive = TRUE;
+				visible = TRUE;
 				break;
 
 			default:
-				e_composer_header_set_sensitive (header, FALSE);
-				e_composer_header_set_visible (header, FALSE);
+				sensitive = FALSE;
+				visible = FALSE;
 				break;
 		}
 
+		e_composer_header_set_sensitive (header, sensitive);
+		e_composer_header_set_visible (header, visible);
+
 		if (key != NULL)
 			binding_id = gconf_bridge_bind_property (
 				bridge, key, G_OBJECT (header), "visible");