Introduce ESelectable and EFocusTracker.

EFocusTracker tracks the input focus within a window and helps keep
the sensitivity of "selectable" actions in the main menu up-to-date.
Selectable actions include Cut, Copy, Paste, Select All and Delete.

EFocusTracker has built-in support for widgets that implement the
GtkEditable interface such as GtkEntry and GtkTextView.  It also
supports custom widgets that implement the ESelectable interface,
which is a subset of GtkEditable and can apply to anything that
displays selectable content (esp. tree views and ETables).

This commit integrates EFocusTracker with EShellWindow, CompEditor,
EMsgComposer, and ESignatureManager.

It also bumps the GtkHTML requirement to 2.29.5 to utilize the new
GtkhtmlEditor:html constructor property.

2 files changed, 154 insertions, 80 deletions

diff --git a/addressbook/gui/widgets/e-addressbook-view.c b/addressbook/gui/widgets/e-addressbook-view.c
index a48ea8c351..91fdb16e4b 100644
--- a/addressbook/gui/widgets/e-addressbook-view.c
+++ b/addressbook/gui/widgets/e-addressbook-view.c
@@ -28,6 +28,7 @@
 #include <table/e-table-model.h>
 #include <table/e-cell-date.h>
 #include <misc/e-gui-utils.h>
+#include <misc/e-selectable.h>
 #include <widgets/menus/gal-view-factory-etable.h>
 #include <filter/e-rule-editor.h>
 #include <widgets/menus/gal-view-etable.h>
@@ -539,6 +540,140 @@ addressbook_view_constructed (GObject *object)
 }
 
 static void
+addressbook_view_update_actions (ESelectable *selectable,
+                                 EFocusTracker *focus_tracker,
+                                 GdkAtom *clipboard_targets,
+                                 gint n_clipboard_targets)
+{
+	EAddressbookView *view;
+	EAddressbookModel *model;
+	ESelectionModel *selection_model;
+	GtkAction *action;
+	gboolean clipboard_has_directory;
+	gboolean source_is_editable;
+	gboolean sensitive;
+	const gchar *tooltip;
+	gint n_contacts;
+	gint n_selected;
+
+	view = E_ADDRESSBOOK_VIEW (selectable);
+	model = e_addressbook_view_get_model (view);
+	selection_model = e_addressbook_view_get_selection_model (view);
+
+	source_is_editable = e_addressbook_model_get_editable (model);
+	n_contacts = (selection_model != NULL) ?
+		e_selection_model_row_count (selection_model) : 0;
+	n_selected = (selection_model != NULL) ?
+		e_selection_model_selected_count (selection_model) : 0;
+
+	clipboard_has_directory = (clipboard_targets != NULL) &&
+		e_targets_include_directory (
+		clipboard_targets, n_clipboard_targets);
+
+	action = e_focus_tracker_get_cut_clipboard_action (focus_tracker);
+	sensitive = source_is_editable && (n_selected > 0);
+	tooltip = _("Cut selected contacts to the clipboard");
+	gtk_action_set_sensitive (action, sensitive);
+	gtk_action_set_tooltip (action, tooltip);
+
+	action = e_focus_tracker_get_copy_clipboard_action (focus_tracker);
+	sensitive = (n_selected > 0);
+	tooltip = _("Copy selected contacts to the clipboard");
+	gtk_action_set_sensitive (action, sensitive);
+	gtk_action_set_tooltip (action, tooltip);
+
+	action = e_focus_tracker_get_paste_clipboard_action (focus_tracker);
+	sensitive = source_is_editable && clipboard_has_directory;
+	tooltip = _("Paste contacts from the clipboard");
+	gtk_action_set_sensitive (action, sensitive);
+	gtk_action_set_tooltip (action, tooltip);
+
+	action = e_focus_tracker_get_select_all_action (focus_tracker);
+	sensitive = (n_contacts > 0);
+	tooltip = _("Select all visible contacts");
+	gtk_action_set_sensitive (action, sensitive);
+	gtk_action_set_tooltip (action, tooltip);
+}
+
+static void
+addressbook_view_cut_clipboard (ESelectable *selectable)
+{
+	EAddressbookView *view;
+
+	view = E_ADDRESSBOOK_VIEW (selectable);
+
+	e_selectable_copy_clipboard (selectable);
+	e_addressbook_view_delete_selection (view, FALSE);
+}
+
+static void
+addressbook_view_copy_clipboard (ESelectable *selectable)
+{
+	EAddressbookView *view;
+	GtkClipboard *clipboard;
+	GList *contact_list;
+	gchar *string;
+
+	view = E_ADDRESSBOOK_VIEW (selectable);
+	clipboard = gtk_clipboard_get (GDK_SELECTION_CLIPBOARD);
+
+	contact_list = e_addressbook_view_get_selected (view);
+
+	string = eab_contact_list_to_string (contact_list);
+	e_clipboard_set_directory (clipboard, string, -1);
+	g_free (string);
+
+	g_list_foreach (contact_list, (GFunc) g_object_unref, NULL);
+	g_list_free (contact_list);
+}
+
+static void
+addressbook_view_paste_clipboard (ESelectable *selectable)
+{
+	EBook *book;
+	EAddressbookView *view;
+	EAddressbookModel *model;
+	GtkClipboard *clipboard;
+	GList *contact_list, *iter;
+	gchar *string;
+
+	view = E_ADDRESSBOOK_VIEW (selectable);
+	clipboard = gtk_clipboard_get (GDK_SELECTION_CLIPBOARD);
+
+	if (!e_clipboard_wait_is_directory_available (clipboard))
+		return;
+
+	model = e_addressbook_view_get_model (view);
+	book = e_addressbook_model_get_book (model);
+
+	string = e_clipboard_wait_for_directory (clipboard);
+	contact_list = eab_contact_list_from_string (string);
+	g_free (string);
+
+	for (iter = contact_list; iter != NULL; iter = iter->next) {
+		EContact *contact = iter->data;
+
+		eab_merging_book_add_contact (book, contact, NULL, NULL);
+	}
+
+	g_list_foreach (contact_list, (GFunc) g_object_unref, NULL);
+	g_list_free (contact_list);
+}
+
+static void
+addressbook_view_select_all (ESelectable *selectable)
+{
+	EAddressbookView *view;
+	ESelectionModel *selection_model;
+
+	view = E_ADDRESSBOOK_VIEW (selectable);
+	selection_model = e_addressbook_view_get_selection_model (view);
+
+	if (selection_model != NULL)
+		e_selection_model_select_all (selection_model);
+}
+
+static void
 addressbook_view_class_init (EAddressbookViewClass *class)
 {
 	GObjectClass *object_class;
@@ -641,6 +776,16 @@ addressbook_view_init (EAddressbookView *view)
 		GTK_SCROLLED_WINDOW (view), GTK_SHADOW_IN);
 }
 
+static void
+addressbook_view_selectable_init (ESelectableInterface *interface)
+{
+	interface->update_actions = addressbook_view_update_actions;
+	interface->cut_clipboard = addressbook_view_cut_clipboard;
+	interface->copy_clipboard = addressbook_view_copy_clipboard;
+	interface->paste_clipboard = addressbook_view_paste_clipboard;
+	interface->select_all = addressbook_view_select_all;
+}
+
 GType
 e_addressbook_view_get_type (void)
 {
@@ -660,9 +805,18 @@ e_addressbook_view_get_type (void)
 			NULL   /* value_table */
 		};
 
+		static const GInterfaceInfo selectable_info = {
+			(GInterfaceInitFunc) addressbook_view_selectable_init,
+			(GInterfaceFinalizeFunc) NULL,
+			NULL   /* interface_data */
+		};
+
 		type = g_type_register_static (
 			GTK_TYPE_SCROLLED_WINDOW, "EAddressbookView",
 			&type_info, 0);
+
+		g_type_add_interface_static (
+			type, E_TYPE_SELECTABLE, &selectable_info);
 	}
 
 	return type;
@@ -1238,82 +1392,6 @@ e_addressbook_view_view (EAddressbookView *view)
 }
 
 void
-e_addressbook_view_cut (EAddressbookView *view)
-{
-	g_return_if_fail (E_IS_ADDRESSBOOK_VIEW (view));
-
-	e_addressbook_view_copy (view);
-	e_addressbook_view_delete_selection (view, FALSE);
-}
-
-void
-e_addressbook_view_copy (EAddressbookView *view)
-{
-	GtkClipboard *clipboard;
-	GList *contact_list;
-	gchar *string;
-
-	g_return_if_fail (E_IS_ADDRESSBOOK_VIEW (view));
-
-	clipboard = gtk_clipboard_get (GDK_SELECTION_CLIPBOARD);
-
-	contact_list = e_addressbook_view_get_selected (view);
-
-	string = eab_contact_list_to_string (contact_list);
-	e_clipboard_set_directory (clipboard, string, -1);
-	g_free (string);
-
-	g_list_foreach (contact_list, (GFunc) g_object_unref, NULL);
-	g_list_free (contact_list);
-}
-
-void
-e_addressbook_view_paste (EAddressbookView *view)
-{
-	EBook *book;
-	EAddressbookModel *model;
-	GtkClipboard *clipboard;
-	GList *contact_list, *iter;
-	gchar *string;
-
-	g_return_if_fail (E_IS_ADDRESSBOOK_VIEW (view));
-
-	clipboard = gtk_clipboard_get (GDK_SELECTION_CLIPBOARD);
-
-	if (!e_clipboard_wait_is_directory_available (clipboard))
-		return;
-
-	model = e_addressbook_view_get_model (view);
-	book = e_addressbook_model_get_book (model);
-
-	string = e_clipboard_wait_for_directory (clipboard);
-	contact_list = eab_contact_list_from_string (string);
-	g_free (string);
-
-	for (iter = contact_list; iter != NULL; iter = iter->next) {
-		EContact *contact = iter->data;
-
-		eab_merging_book_add_contact (book, contact, NULL, NULL);
-	}
-
-	g_list_foreach (contact_list, (GFunc) g_object_unref, NULL);
-	g_list_free (contact_list);
-}
-
-void
-e_addressbook_view_select_all (EAddressbookView *view)
-{
-	ESelectionModel *model;
-
-	g_return_if_fail (E_IS_ADDRESSBOOK_VIEW (view));
-
-	model = e_addressbook_view_get_selection_model (view);
-	g_return_if_fail (model);
-
-	e_selection_model_select_all (model);
-}
-
-void
 e_addressbook_view_show_all (EAddressbookView *view)
 {
 	g_return_if_fail (E_IS_ADDRESSBOOK_VIEW (view));
diff --git a/addressbook/gui/widgets/e-addressbook-view.h b/addressbook/gui/widgets/e-addressbook-view.h
index 319d060b89..55f114a538 100644
--- a/addressbook/gui/widgets/e-addressbook-view.h
+++ b/addressbook/gui/widgets/e-addressbook-view.h
@@ -103,10 +103,6 @@ void		e_addressbook_view_print	(EAddressbookView *view,
 void		e_addressbook_view_delete_selection
 						(EAddressbookView *view,
 						 gboolean is_delete);
-void		e_addressbook_view_cut		(EAddressbookView *view);
-void		e_addressbook_view_copy		(EAddressbookView *view);
-void		e_addressbook_view_paste	(EAddressbookView *view);
-void		e_addressbook_view_select_all	(EAddressbookView *view);
 void		e_addressbook_view_show_all	(EAddressbookView *view);
 void		e_addressbook_view_stop		(EAddressbookView *view);
 void		e_addressbook_view_copy_to_folder