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[evolution] Add cal_shell_content_check_state().

commit 6ec3b5ae147cdf552c323ea66a0f22b753c6970f
Author: Matthew Barnes <mbarnes redhat com>
Date:   Sat Aug 18 09:50:17 2012 -0400

    Add cal_shell_content_check_state().

 modules/calendar/e-cal-shell-content.c |  214 ++++++++++++++++++++++++++++++
 modules/calendar/e-cal-shell-content.h |   15 +--
 modules/calendar/e-cal-shell-view.c    |  222 ++++++++++----------------------
 3 files changed, 289 insertions(+), 162 deletions(-)
---
diff --git a/modules/calendar/e-cal-shell-content.c b/modules/calendar/e-cal-shell-content.c
index b77bbfe..5d8e7e6 100644
--- a/modules/calendar/e-cal-shell-content.c
+++ b/modules/calendar/e-cal-shell-content.c
@@ -558,6 +558,219 @@ cal_shell_content_map (GtkWidget *widget)
 	GTK_WIDGET_CLASS (e_cal_shell_content_parent_class)->map (widget);
 }
 
+/* Helper for cal_shell_content_check_state() */
+static icalproperty *
+cal_shell_content_get_attendee_prop (icalcomponent *icalcomp,
+                                     const gchar *address)
+{
+	icalproperty *prop;
+
+	if (address == NULL || *address == '\0')
+		return NULL;
+
+	prop = icalcomponent_get_first_property (
+		icalcomp, ICAL_ATTENDEE_PROPERTY);
+
+	while (prop != NULL) {
+		const gchar *attendee;
+
+		attendee = icalproperty_get_attendee (prop);
+
+		if (g_str_equal (itip_strip_mailto (attendee), address))
+			return prop;
+
+		prop = icalcomponent_get_next_property (
+			icalcomp, ICAL_ATTENDEE_PROPERTY);
+	}
+
+	return NULL;
+}
+
+/* Helper for cal_shell_content_check_state() */
+static gboolean
+cal_shell_content_icalcomp_is_delegated (icalcomponent *icalcomp,
+                                         const gchar *user_email)
+{
+	icalproperty *prop;
+	icalparameter *param;
+	const gchar *delto = NULL;
+	gboolean is_delegated = FALSE;
+
+	prop = cal_shell_content_get_attendee_prop (icalcomp, user_email);
+
+	if (prop != NULL) {
+		param = icalproperty_get_first_parameter (
+			prop, ICAL_DELEGATEDTO_PARAMETER);
+		if (param != NULL) {
+			delto = icalparameter_get_delegatedto (param);
+			delto = itip_strip_mailto (delto);
+		}
+	} else
+		return FALSE;
+
+	prop = cal_shell_content_get_attendee_prop (icalcomp, delto);
+
+	if (prop != NULL) {
+		const gchar *delfrom = NULL;
+		icalparameter_partstat status = ICAL_PARTSTAT_NONE;
+
+		param = icalproperty_get_first_parameter (
+			prop, ICAL_DELEGATEDFROM_PARAMETER);
+		if (param != NULL) {
+			delfrom = icalparameter_get_delegatedfrom (param);
+			delfrom = itip_strip_mailto (delfrom);
+		}
+		param = icalproperty_get_first_parameter (
+			prop, ICAL_PARTSTAT_PARAMETER);
+		if (param != NULL)
+			status = icalparameter_get_partstat (param);
+		is_delegated =
+			(status != ICAL_PARTSTAT_DECLINED) &&
+			(g_strcmp0 (delfrom, user_email) == 0);
+	}
+
+	return is_delegated;
+}
+
+static guint32
+cal_shell_content_check_state (EShellContent *shell_content)
+{
+	EShell *shell;
+	EShellView *shell_view;
+	EShellBackend *shell_backend;
+	ESourceRegistry *registry;
+	ECalShellContent *cal_shell_content;
+	GnomeCalendar *calendar;
+	ECalendarView *calendar_view;
+	GnomeCalendarViewType view_type;
+	gboolean selection_is_editable = FALSE;
+	gboolean selection_is_instance = FALSE;
+	gboolean selection_is_meeting = FALSE;
+	gboolean selection_is_organizer = FALSE;
+	gboolean selection_is_recurring = FALSE;
+	gboolean selection_can_delegate = FALSE;
+	guint32 state = 0;
+	GList *selected;
+	GList *link;
+	guint n_selected;
+
+	cal_shell_content = E_CAL_SHELL_CONTENT (shell_content);
+
+	shell_view = e_shell_content_get_shell_view (shell_content);
+	shell_backend = e_shell_view_get_shell_backend (shell_view);
+	shell = e_shell_backend_get_shell (shell_backend);
+	registry = e_shell_get_registry (shell);
+
+	calendar = e_cal_shell_content_get_calendar (cal_shell_content);
+	view_type = gnome_calendar_get_view (calendar);
+	calendar_view = gnome_calendar_get_calendar_view (calendar, view_type);
+
+	selected = e_calendar_view_get_selected_events (calendar_view);
+	n_selected = g_list_length (selected);
+
+	/* If we have a selection, assume it's
+	 * editable until we learn otherwise. */
+	if (n_selected > 0)
+		selection_is_editable = TRUE;
+
+	for (link = selected; link != NULL; link = g_list_next (link)) {
+		ECalendarViewEvent *event = link->data;
+		ECalClient *client;
+		ECalComponent *comp;
+		gchar *user_email;
+		icalcomponent *icalcomp;
+		const gchar *capability;
+		gboolean cap_delegate_supported;
+		gboolean cap_delegate_to_many;
+		gboolean icalcomp_is_delegated;
+		gboolean read_only;
+
+		if (!is_comp_data_valid (event))
+			continue;
+
+		client = event->comp_data->client;
+		icalcomp = event->comp_data->icalcomp;
+
+		read_only = e_client_is_readonly (E_CLIENT (client));
+		selection_is_editable &= !read_only;
+
+		selection_is_instance |=
+			e_cal_util_component_is_instance (icalcomp);
+
+		selection_is_meeting =
+			(n_selected == 1) &&
+			e_cal_util_component_has_attendee (icalcomp);
+
+		selection_is_recurring |=
+			e_cal_util_component_is_instance (icalcomp) ||
+			e_cal_util_component_has_recurrences (icalcomp);
+
+		/* XXX The rest of this is rather expensive and
+		 *     only applies if a single event is selected,
+		 *     so continue with the loop iteration if the
+		 *     rest of this is not applicable. */
+		if (n_selected > 1)
+			continue;
+
+		/* XXX This probably belongs in comp-util.c. */
+
+		comp = e_cal_component_new ();
+		e_cal_component_set_icalcomponent (
+			comp, icalcomponent_new_clone (icalcomp));
+		user_email = itip_get_comp_attendee (
+			registry, comp, client);
+
+		selection_is_organizer =
+			e_cal_util_component_has_organizer (icalcomp) &&
+			itip_organizer_is_user (registry, comp, client);
+
+		capability = CAL_STATIC_CAPABILITY_DELEGATE_SUPPORTED;
+		cap_delegate_supported =
+			e_client_check_capability (
+			E_CLIENT (client), capability);
+
+		capability = CAL_STATIC_CAPABILITY_DELEGATE_TO_MANY;
+		cap_delegate_to_many =
+			e_client_check_capability (
+			E_CLIENT (client), capability);
+
+		icalcomp_is_delegated =
+			(user_email != NULL) &&
+			cal_shell_content_icalcomp_is_delegated (
+			icalcomp, user_email);
+
+		selection_can_delegate =
+			cap_delegate_supported &&
+			(cap_delegate_to_many ||
+			(!selection_is_organizer &&
+			 !icalcomp_is_delegated));
+
+		g_free (user_email);
+		g_object_unref (comp);
+	}
+
+	g_list_free (selected);
+
+	if (n_selected == 1)
+		state |= E_CAL_SHELL_CONTENT_SELECTION_SINGLE;
+	if (n_selected > 1)
+		state |= E_CAL_SHELL_CONTENT_SELECTION_MULTIPLE;
+	if (selection_is_editable)
+		state |= E_CAL_SHELL_CONTENT_SELECTION_IS_EDITABLE;
+	if (selection_is_instance)
+		state |= E_CAL_SHELL_CONTENT_SELECTION_IS_INSTANCE;
+	if (selection_is_meeting)
+		state |= E_CAL_SHELL_CONTENT_SELECTION_IS_MEETING;
+	if (selection_is_organizer)
+		state |= E_CAL_SHELL_CONTENT_SELECTION_IS_ORGANIZER;
+	if (selection_is_recurring)
+		state |= E_CAL_SHELL_CONTENT_SELECTION_IS_RECURRING;
+	if (selection_can_delegate)
+		state |= E_CAL_SHELL_CONTENT_SELECTION_CAN_DELEGATE;
+
+	return state;
+}
+
 static void
 cal_shell_content_focus_search_results (EShellContent *shell_content)
 {
@@ -593,6 +806,7 @@ e_cal_shell_content_class_init (ECalShellContentClass *class)
 	widget_class->map = cal_shell_content_map;
 
 	shell_content_class = E_SHELL_CONTENT_CLASS (class);
+	shell_content_class->check_state = cal_shell_content_check_state;
 	shell_content_class->focus_search_results = cal_shell_content_focus_search_results;
 
 	g_object_class_install_property (
diff --git a/modules/calendar/e-cal-shell-content.h b/modules/calendar/e-cal-shell-content.h
index 906fe80..21e971b 100644
--- a/modules/calendar/e-cal-shell-content.h
+++ b/modules/calendar/e-cal-shell-content.h
@@ -59,15 +59,12 @@ typedef struct _ECalShellContentPrivate ECalShellContentPrivate;
 enum {
 	E_CAL_SHELL_CONTENT_SELECTION_SINGLE		= 1 << 0,
 	E_CAL_SHELL_CONTENT_SELECTION_MULTIPLE		= 1 << 1,
-	E_CAL_SHELL_CONTENT_SELECTION_IS_ASSIGNABLE	= 1 << 2,
-	E_CAL_SHELL_CONTENT_SELECTION_IS_COMPLETE	= 1 << 3,
-	E_CAL_SHELL_CONTENT_SELECTION_IS_EDITABLE	= 1 << 4,
-	E_CAL_SHELL_CONTENT_SELECTION_IS_MEETING	= 1 << 5,
-	E_CAL_SHELL_CONTENT_SELECTION_IS_ORGANIZER	= 1 << 6,
-	E_CAL_SHELL_CONTENT_SELECTION_IS_RECURRING	= 1 << 7,
-	E_CAL_SHELL_CONTENT_SELECTION_CAN_ACCEPT	= 1 << 8,
-	E_CAL_SHELL_CONTENT_SELECTION_CAN_DELEGATE	= 1 << 9,
-	E_CAL_SHELL_CONTENT_SELECTION_CAN_SAVE		= 1 << 10
+	E_CAL_SHELL_CONTENT_SELECTION_IS_EDITABLE	= 1 << 2,
+	E_CAL_SHELL_CONTENT_SELECTION_IS_INSTANCE	= 1 << 3,
+	E_CAL_SHELL_CONTENT_SELECTION_IS_MEETING	= 1 << 4,
+	E_CAL_SHELL_CONTENT_SELECTION_IS_ORGANIZER	= 1 << 5,
+	E_CAL_SHELL_CONTENT_SELECTION_IS_RECURRING	= 1 << 6,
+	E_CAL_SHELL_CONTENT_SELECTION_CAN_DELEGATE	= 1 << 7
 };
 
 struct _ECalShellContent {
diff --git a/modules/calendar/e-cal-shell-view.c b/modules/calendar/e-cal-shell-view.c
index 7b90948..ef8b6c5 100644
--- a/modules/calendar/e-cal-shell-view.c
+++ b/modules/calendar/e-cal-shell-view.c
@@ -302,108 +302,41 @@ cal_shell_view_execute_search (EShellView *shell_view)
 	e_shell_view_update_actions (shell_view);
 }
 
-static icalproperty *
-get_attendee_prop (icalcomponent *icalcomp,
-                   const gchar *address)
-{
-
-	icalproperty *prop;
-
-	if (!(address && *address))
-		return NULL;
-
-	prop = icalcomponent_get_first_property (
-		icalcomp, ICAL_ATTENDEE_PROPERTY);
-
-	while (prop != NULL) {
-		const gchar *attendee = icalproperty_get_attendee (prop);
-
-		if (g_str_equal (itip_strip_mailto (attendee), address))
-			return prop;
-
-		prop = icalcomponent_get_next_property (
-			icalcomp, ICAL_ATTENDEE_PROPERTY);
-	}
-
-	return NULL;
-}
-
-static gboolean
-is_delegated (icalcomponent *icalcomp,
-              const gchar *user_email)
-{
-	icalproperty *prop;
-	icalparameter *param;
-	const gchar *delto = NULL;
-
-	prop = get_attendee_prop (icalcomp, user_email);
-
-	if (prop != NULL) {
-		param = icalproperty_get_first_parameter (
-			prop, ICAL_DELEGATEDTO_PARAMETER);
-		if (param != NULL)
-			delto = icalparameter_get_delegatedto (param);
-	} else
-		return FALSE;
-
-	prop = get_attendee_prop (icalcomp, itip_strip_mailto (delto));
-
-	if (prop != NULL) {
-		const gchar *delfrom = NULL;
-		icalparameter_partstat status = ICAL_PARTSTAT_NONE;
-
-		param = icalproperty_get_first_parameter (
-			prop, ICAL_DELEGATEDFROM_PARAMETER);
-		if (param != NULL)
-			delfrom = icalparameter_get_delegatedfrom (param);
-		param = icalproperty_get_first_parameter (
-			prop, ICAL_PARTSTAT_PARAMETER);
-		if (param != NULL)
-			status = icalparameter_get_partstat (param);
-		if ((delfrom != NULL && *delfrom != '\0') &&
-			g_str_equal (itip_strip_mailto (delfrom),
-			user_email) && status != ICAL_PARTSTAT_DECLINED)
-			return TRUE;
-	}
-
-	return FALSE;
-}
-
 static void
 cal_shell_view_update_actions (EShellView *shell_view)
 {
 	ECalShellViewPrivate *priv;
 	ECalShellContent *cal_shell_content;
+	EShellContent *shell_content;
 	EShellSidebar *shell_sidebar;
 	EShellWindow *shell_window;
 	EShell *shell;
 	ESource *source;
 	ESourceRegistry *registry;
-	GnomeCalendarViewType view_type;
 	GnomeCalendar *calendar;
 	ECalModel *model;
-	ECalendarView *view;
 	GtkAction *action;
-	GList *list, *iter;
 	const gchar *model_sexp;
 	gboolean is_searching;
 	gboolean sensitive;
 	guint32 state;
-	gint n_selected;
 
 	/* Be descriptive. */
-	gboolean editable = TRUE;
-	gboolean has_mail_identity;
+	gboolean any_events_selected;
+	gboolean has_mail_identity = FALSE;
 	gboolean has_primary_source;
 	gboolean primary_source_is_writable;
 	gboolean primary_source_is_removable;
 	gboolean primary_source_is_remote_deletable;
 	gboolean primary_source_in_collection;
-	gboolean recurring = FALSE;
-	gboolean is_instance = FALSE;
-	gboolean is_meeting = FALSE;
-	gboolean is_delegatable = FALSE;
-	gboolean refresh_supported = FALSE;
+	gboolean multiple_events_selected;
+	gboolean selection_is_editable;
+	gboolean selection_is_instance;
+	gboolean selection_is_meeting;
+	gboolean selection_is_recurring;
+	gboolean selection_can_delegate;
+	gboolean single_event_selected;
+	gboolean refresh_supported;
 
 	/* Chain up to parent's update_actions() method. */
 	E_SHELL_VIEW_CLASS (parent_class)->update_actions (shell_view);
@@ -431,80 +364,37 @@ cal_shell_view_update_actions (EShellView *shell_view)
 
 	registry = e_shell_get_registry (shell);
 	source = e_source_registry_ref_default_mail_identity (registry);
+	has_mail_identity = (source != NULL);
 	if (source != NULL) {
 		has_mail_identity = TRUE;
 		g_object_unref (source);
-	} else {
-		has_mail_identity = FALSE;
 	}
 
 	cal_shell_content = priv->cal_shell_content;
 	calendar = e_cal_shell_content_get_calendar (cal_shell_content);
-	view_type = gnome_calendar_get_view (calendar);
-	view = gnome_calendar_get_calendar_view (calendar, view_type);
 	model = gnome_calendar_get_model (calendar);
 	model_sexp = e_cal_model_get_search_query (model);
 	is_searching = model_sexp && *model_sexp &&
 		g_strcmp0 (model_sexp, "#t") != 0 &&
 		g_strcmp0 (model_sexp, "(contains? \"summary\"  \"\")") != 0;
 
-	list = e_calendar_view_get_selected_events (view);
-	n_selected = g_list_length (list);
-
-	for (iter = list; iter != NULL; iter = iter->next) {
-		ECalendarViewEvent *event = iter->data;
-		ECalClient *client;
-		ECalComponent *comp;
-		icalcomponent *icalcomp;
-		gchar *user_email = NULL;
-		gboolean user_org = FALSE;
-		gboolean read_only = TRUE;
-
-		if (!is_comp_data_valid (event))
-			continue;
-
-		client = event->comp_data->client;
-		icalcomp = event->comp_data->icalcomp;
-
-		read_only = e_client_is_readonly (E_CLIENT (client));
-		editable = editable && !read_only;
-
-		is_instance |= e_cal_util_component_is_instance (icalcomp);
-
-		recurring |=
-			e_cal_util_component_is_instance (icalcomp) ||
-			e_cal_util_component_has_recurrences (icalcomp);
-
-		/* The following tests only apply if one event is selected. */
-		if (iter != list || n_selected > 1)
-			continue;
-
-		comp = e_cal_component_new ();
-		e_cal_component_set_icalcomponent (
-			comp, icalcomponent_new_clone (icalcomp));
-		user_email = itip_get_comp_attendee (
-			registry, comp, client);
-
-		is_meeting = e_cal_util_component_has_attendee (icalcomp);
-
-		user_org =
-			e_cal_util_component_has_organizer (icalcomp) &&
-			itip_organizer_is_user (registry, comp, client);
-
-		is_delegatable =
-			e_client_check_capability (
-				E_CLIENT (client),
-				CAL_STATIC_CAPABILITY_DELEGATE_SUPPORTED) &&
-			(e_client_check_capability (
-				E_CLIENT (client),
-				CAL_STATIC_CAPABILITY_DELEGATE_TO_MANY) ||
-			(!user_org && !is_delegated (icalcomp, user_email)));
-
-		g_free (user_email);
-		g_object_unref (comp);
-	}
-
-	g_list_free (list);
+	shell_content = e_shell_view_get_shell_content (shell_view);
+	state = e_shell_content_check_state (shell_content);
+
+	single_event_selected =
+		(state & E_CAL_SHELL_CONTENT_SELECTION_SINGLE);
+	multiple_events_selected =
+		(state & E_CAL_SHELL_CONTENT_SELECTION_MULTIPLE);
+	selection_is_editable =
+		(state & E_CAL_SHELL_CONTENT_SELECTION_IS_EDITABLE);
+	selection_is_instance =
+		(state & E_CAL_SHELL_CONTENT_SELECTION_IS_INSTANCE);
+	selection_is_meeting =
+		(state & E_CAL_SHELL_CONTENT_SELECTION_IS_MEETING);
+	selection_is_recurring =
+		(state & E_CAL_SHELL_CONTENT_SELECTION_IS_RECURRING);
+	selection_can_delegate =
+		(state & E_CAL_SHELL_CONTENT_SELECTION_CAN_DELEGATE);
 
 	shell_sidebar = e_shell_view_get_shell_sidebar (shell_view);
 	state = e_shell_sidebar_check_state (shell_sidebar);
@@ -522,6 +412,9 @@ cal_shell_view_update_actions (EShellView *shell_view)
 	refresh_supported =
 		(state & E_CAL_SHELL_SIDEBAR_SOURCE_SUPPORTS_REFRESH);
 
+	any_events_selected =
+		(single_event_selected || multiple_events_selected);
+
 	action = ACTION (CALENDAR_COPY);
 	sensitive = has_primary_source;
 	gtk_action_set_sensitive (action, sensitive);
@@ -558,54 +451,77 @@ cal_shell_view_update_actions (EShellView *shell_view)
 
 	action = ACTION (EVENT_DELEGATE);
 	sensitive =
-		(n_selected == 1) && editable &&
-		is_delegatable && is_meeting;
+		single_event_selected &&
+		selection_is_editable &&
+		selection_can_delegate &&
+		selection_is_meeting;
 	gtk_action_set_sensitive (action, sensitive);
 
 	action = ACTION (EVENT_DELETE);
-	sensitive = (n_selected > 0) && editable && !recurring;
+	sensitive =
+		any_events_selected &&
+		selection_is_editable &&
+		!selection_is_recurring;
 	gtk_action_set_sensitive (action, sensitive);
 
 	action = ACTION (EVENT_DELETE_OCCURRENCE);
-	sensitive = (n_selected > 0) && editable && recurring;
+	sensitive =
+		any_events_selected &&
+		selection_is_editable &&
+		selection_is_recurring;
 	gtk_action_set_sensitive (action, sensitive);
 
 	action = ACTION (EVENT_DELETE_OCCURRENCE_ALL);
-	sensitive = (n_selected > 0) && editable && recurring;
+	sensitive =
+		any_events_selected &&
+		selection_is_editable &&
+		selection_is_recurring;
 	gtk_action_set_sensitive (action, sensitive);
 
 	action = ACTION (EVENT_FORWARD);
-	sensitive = (n_selected == 1);
+	sensitive = single_event_selected;
 	gtk_action_set_sensitive (action, sensitive);
 
 	action = ACTION (EVENT_OCCURRENCE_MOVABLE);
 	sensitive =
-		(n_selected == 1) && editable &&
-		recurring && is_instance;
+		single_event_selected &&
+		selection_is_editable &&
+		selection_is_recurring &&
+		selection_is_instance;
 	gtk_action_set_sensitive (action, sensitive);
 
 	action = ACTION (EVENT_OPEN);
-	sensitive = (n_selected == 1);
+	sensitive = single_event_selected;
 	gtk_action_set_sensitive (action, sensitive);
 
 	action = ACTION (EVENT_PRINT);
-	sensitive = (n_selected == 1);
+	sensitive = single_event_selected;
+	gtk_action_set_sensitive (action, sensitive);
+
+	action = ACTION (EVENT_SAVE_AS);
+	sensitive = single_event_selected;
 	gtk_action_set_sensitive (action, sensitive);
 
 	action = ACTION (EVENT_SCHEDULE);
-	sensitive = (n_selected == 1) && editable && !is_meeting;
+	sensitive =
+		single_event_selected &&
+		selection_is_editable &&
+		!selection_is_meeting;
 	gtk_action_set_sensitive (action, sensitive);
 
 	action = ACTION (EVENT_SCHEDULE_APPOINTMENT);
-	sensitive = (n_selected == 1) && editable && is_meeting;
+	sensitive =
+		single_event_selected &&
+		selection_is_editable &&
+		selection_is_meeting;
 	gtk_action_set_sensitive (action, sensitive);
 
 	action = ACTION (EVENT_REPLY);
-	sensitive = (n_selected == 1) && is_meeting;
+	sensitive = single_event_selected && selection_is_meeting;
 	gtk_action_set_sensitive (action, sensitive);
 
 	action = ACTION (EVENT_REPLY_ALL);
-	sensitive = (n_selected == 1) && is_meeting;
+	sensitive = single_event_selected && selection_is_meeting;
 	gtk_action_set_sensitive (action, sensitive);
 
 	action = ACTION (EVENT_MEETING_NEW);
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