Switching label to be 'switch from'

1 files changed, 113 insertions, 4 deletions

diff --git a/src/indicator-session.c b/src/indicator-session.c
index dda8c76..1b9629b 100644
--- a/src/indicator-session.c
+++ b/src/indicator-session.c
@@ -22,6 +22,7 @@ with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #include <glib.h>
 #include <glib-object.h>
+#include <glib/gi18n.h>
 #include <gtk/gtk.h>
 #include <libdbusmenu-gtk/menu.h>
 
@@ -33,6 +34,7 @@ with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include <libindicator/indicator-service-manager.h>
 
 #include "dbus-shared-names.h"
+#include "dbusmenu-shared.h"
 
 #define INDICATOR_SESSION_TYPE            (indicator_session_get_type ())
 #define INDICATOR_SESSION(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), INDICATOR_SESSION_TYPE, IndicatorSession))
@@ -51,6 +53,8 @@ struct _IndicatorSessionClass {
 struct _IndicatorSession {
 	IndicatorObject parent;
 	IndicatorServiceManager * service;
+	GtkImage * status_image;
+	DbusmenuGtkMenu * menu;
 };
 
 GType indicator_session_get_type (void);
@@ -63,6 +67,7 @@ INDICATOR_SET_TYPE(INDICATOR_SESSION_TYPE)
 static GtkLabel * get_label (IndicatorObject * io);
 static GtkImage * get_icon (IndicatorObject * io);
 static GtkMenu * get_menu (IndicatorObject * io);
+static gboolean build_menu_switch (DbusmenuMenuitem * newitem, DbusmenuMenuitem * parent, DbusmenuClient * client);
 
 static void indicator_session_class_init (IndicatorSessionClass *klass);
 static void indicator_session_init       (IndicatorSession *self);
@@ -96,6 +101,12 @@ indicator_session_init (IndicatorSession *self)
 	/* Now let's fire these guys up. */
 	self->service = indicator_service_manager_new_version(INDICATOR_SESSION_DBUS_NAME, INDICATOR_SESSION_DBUS_VERSION);
 
+	self->status_image = GTK_IMAGE(gtk_image_new_from_icon_name("system-shutdown-panel", GTK_ICON_SIZE_MENU));
+	self->menu = dbusmenu_gtkmenu_new(INDICATOR_SESSION_DBUS_NAME, INDICATOR_SESSION_DBUS_OBJECT);
+
+	DbusmenuClient * client = DBUSMENU_CLIENT(dbusmenu_gtkmenu_get_client(self->menu));
+	dbusmenu_client_add_type_handler(client, MENU_SWITCH_TYPE, build_menu_switch);
+
 	return;
 }
 
@@ -130,9 +141,8 @@ get_label (IndicatorObject * io)
 static GtkImage *
 get_icon (IndicatorObject * io)
 {
-	GtkImage * status_image = GTK_IMAGE(gtk_image_new_from_icon_name("system-shutdown-panel", GTK_ICON_SIZE_MENU));
-	gtk_widget_show(GTK_WIDGET(status_image));
-	return status_image;
+	gtk_widget_show(GTK_WIDGET(INDICATOR_SESSION(io)->status_image));
+	return INDICATOR_SESSION(io)->status_image;
 }
 
 /* Indicator based function to get the menu for the whole
@@ -141,7 +151,106 @@ get_icon (IndicatorObject * io)
 static GtkMenu *
 get_menu (IndicatorObject * io)
 {
-	return GTK_MENU(dbusmenu_gtkmenu_new(INDICATOR_SESSION_DBUS_NAME, INDICATOR_SESSION_DBUS_OBJECT));
+	return GTK_MENU(INDICATOR_SESSION(io)->menu);
+}
+
+static void
+switch_property_change (DbusmenuMenuitem * item, const gchar * property, const GValue * value, gpointer user_data)
+{
+	if (g_strcmp0(property, MENU_SWITCH_USER) != 0) {
+		return;
+	}
+	
+	GtkMenuItem * gmi = dbusmenu_gtkclient_menuitem_get(DBUSMENU_GTKCLIENT(user_data), item);
+	gchar * finalstring = NULL;
+	gboolean set_ellipsize = FALSE;
+
+	/* If there's a NULL string of some type, then we want to
+	   go back to our old 'Switch User' which isn't great but
+	   eh, this error condition should never happen. */
+	if (value == NULL || g_value_get_string(value) == NULL || g_value_get_string(value)[0] == '\0') {
+		finalstring = _("Switch User...");
+		set_ellipsize = FALSE;
+	}
+
+	if (finalstring == NULL) {
+		const gchar * username = g_value_get_string(value);
+		GtkStyle * style = gtk_widget_get_style(GTK_WIDGET(gmi));
+
+		PangoLayout * layout = pango_layout_new(gtk_widget_get_pango_context(GTK_WIDGET(gmi)));
+		pango_layout_set_text(layout, username, -1);
+		pango_layout_set_font_description(layout, style->font_desc);
+
+		gint width;
+		pango_layout_get_pixel_size(layout, &width, NULL);
+		g_debug("Username width %dpx", width);
+
+		gint point = pango_font_description_get_size(style->font_desc);
+		g_debug("Font size %f pt", (gfloat)point / PANGO_SCALE);
+
+		gdouble dpi = gdk_screen_get_resolution(gdk_screen_get_default());
+		g_debug("Screen DPI %f", dpi);
+
+		gdouble pixels_per_em = ((point * dpi) / 72.0f) / PANGO_SCALE;
+		gdouble ems = width / pixels_per_em;
+		g_debug("Username width %fem", ems);
+
+		/* TODO: We need some way to remove the elipsis from appearing
+		         twice in the label.  Not sure how to do that yet. */
+		finalstring = g_strdup_printf(_("Switch from %s..."), username);
+		if (ems >= 20.0f) {
+			set_ellipsize = TRUE;
+		} else {
+			set_ellipsize = FALSE;
+		}
+	}
+
+	gtk_menu_item_set_label(gmi, finalstring);
+
+	GtkLabel * label = GTK_LABEL(gtk_bin_get_child(GTK_BIN(gmi)));
+	if (label != NULL) {
+		if (set_ellipsize) {
+			gtk_label_set_ellipsize(label, PANGO_ELLIPSIZE_END);
+		} else {
+			gtk_label_set_ellipsize(label, PANGO_ELLIPSIZE_NONE);
+		}
+	}
+
+	return;
+}
+
+static const gchar * dbusmenu_item_data = "dbusmenu-item";
+
+/* Callback for when the style changes so we can reevaluate the
+   size of the user name with the potentially new font. */
+static void
+switch_style_set (GtkWidget * widget, GtkStyle * prev_style, gpointer user_data)
+{
+	DbusmenuGtkClient * client = DBUSMENU_GTKCLIENT(user_data);
+	DbusmenuMenuitem * mi = DBUSMENU_MENUITEM(g_object_get_data(G_OBJECT(widget), dbusmenu_item_data));
+
+	switch_property_change(mi, MENU_SWITCH_USER, dbusmenu_menuitem_property_get_value(mi, MENU_SWITCH_USER), client);
+	return;
 }
 
 
+/* This function checks to see if the user name is short enough
+   to not need ellipsing itself, or if, it will get ellipsed by
+   the standard label processor. */
+static gboolean
+build_menu_switch (DbusmenuMenuitem * newitem, DbusmenuMenuitem * parent, DbusmenuClient * client)
+{
+	GtkMenuItem * gmi = GTK_MENU_ITEM(gtk_menu_item_new());
+	if (gmi == NULL) {
+		return FALSE;
+	}
+	g_object_set_data(G_OBJECT(gmi), dbusmenu_item_data, newitem);
+
+	dbusmenu_gtkclient_newitem_base(DBUSMENU_GTKCLIENT(client), newitem, gmi, parent);
+
+	g_signal_connect(G_OBJECT(newitem), DBUSMENU_MENUITEM_SIGNAL_PROPERTY_CHANGED, G_CALLBACK(switch_property_change), client);
+	g_signal_connect(G_OBJECT(gmi), "style-set", G_CALLBACK(switch_style_set), client);
+	switch_property_change(newitem, MENU_SWITCH_USER, dbusmenu_menuitem_property_get_value(newitem, MENU_SWITCH_USER), client);
+
+	return TRUE;
+}