Check that view->view != NULL. (save_contact_cb): Check that view->view !=

2001-10-11  Jon Trowbridge  <trow@ximian.com>

        * gui/component/addressbook.c (new_contact_cb): Check that
        view->view != NULL.
        (save_contact_cb): Check that view->view != NULL.
        (search_cb): Check that view->view != NULL.
        (delete_contact_cb): Check that view->view != NULL.
        (print_cb): Check that view->view != NULL.
        (print_preview_cb): Check that view->view != NULL.
        (stop_loading_cb): Check that view->view != NULL.
        (cut_contacts_cb): Check that view->view != NULL.
        (copy_contacts_cb): Check that view->view != NULL.
        (paste_contacts_cb): Check that view->view != NULL.
        (select_all_contacts_cb): Check that view->view != NULL.
        (send_contact_cb): Check that view->view != NULL.
        (send_contact_to_cb): Check that view->view != NULL.
        (update_command_state): Check that view->view != NULL.  Hold a
        reference to the AddressbookView for the duration of the function,
        in case we exit during bonobo-reentrancy.
        (addressbook_view_ref): Added.
        (addressbook_view_unref): Added.  Simple ref counting for
        AddressbookView objects.
        (addressbook_view_clear): Zero out an AddressbookView.  This is
        now separated from the deallocation of the AddressbookView object,
        so that we don't leave a dangling pointer if we exit during
        bonobo-reentrancy in update_command_state. (Which often seems to
        happen if we exit while addressbook operations are going on.)
        (destroy_callback): Replace previous call to addressbook_view_free
        with addressbook_view_clear/addressbook_view_unref calls.
        (addressbook_factory_new_control): Initialize the reference count
        in the AddressbookView object.

        * gui/widgets/e-addressbook-view.c (e_addressbook_view_destroy):
        Carefully zero out our destroyed object.
        (command_state_change): Hold a reference to ourselves during the
        signal emission.
        (get_selected_cards): Ref cards as we add them to the list.
        (e_addressbook_view_stop): Check for view != NULL.
        (e_addressbook_view_can_create): Check for view != NULL.
        (e_addressbook_view_can_print): Check for view != NULL.
        (e_addressbook_view_can_save_as): Check for view != NULL.
        (e_addressbook_view_can_send): Check for view != NULL.
        (e_addressbook_view_can_send_to): Check for view != NULL.
        (e_addressbook_view_can_delete): Check for view != NULL.
        (e_addressbook_view_can_cut): Check for view != NULL.
        (e_addressbook_view_can_copy): Check for view != NULL.
        (e_addressbook_view_can_paste): Check for view != NULL.
        (e_addressbook_view_can_select_all): Check for view != NULL.
        (e_addressbook_view_can_stop): Check for view != NULL.

        * gui/widgets/e-addressbook-model.c (addressbook_destroy): Be
        careful about zeroing out our destroyed object.

        * backend/ebook/e-book-view.c (e_book_view_stop): Added.  Stops
        event processing in the underlying listener.

svn path=/trunk/; revision=13578

3 files changed, 140 insertions, 55 deletions

diff --git a/addressbook/gui/component/addressbook.c b/addressbook/gui/component/addressbook.c
index 6b4108046f..8dc978f603 100644
--- a/addressbook/gui/component/addressbook.c
+++ b/addressbook/gui/component/addressbook.c
@@ -55,6 +55,7 @@ static GdkPixbuf *progress_icon[2] = { NULL, NULL };
 #define PROPERTY_FOLDER_URI_IDX      1
 
 typedef struct {
+	gint refs;
 	EAddressbookView *view;
 	ESearchBar *search;
 	GtkWidget *vbox;
@@ -65,19 +66,24 @@ typedef struct {
 	char *passwd;
 } AddressbookView;
 
+static void addressbook_view_ref (AddressbookView *);
+static void addressbook_view_unref (AddressbookView *);
+
 static void
 new_contact_cb (BonoboUIComponent *uih, void *user_data, const char *path)
 {
 	EBook *book;
 	AddressbookView *view = (AddressbookView *) user_data;
 
-	gtk_object_get(GTK_OBJECT(view->view),
-		       "book", &book,
-		       NULL);
+	if (view->view) {
+		gtk_object_get(GTK_OBJECT(view->view),
+			       "book", &book,
+			       NULL);
 
-	g_assert (E_IS_BOOK (book));
+		g_assert (E_IS_BOOK (book));
 
-	e_addressbook_show_contact_editor (book, e_card_new(""), TRUE, e_addressbook_view_can_create(view->view));
+		e_addressbook_show_contact_editor (book, e_card_new(""), TRUE, e_addressbook_view_can_create(view->view));
+	}
 }
 
 static void
@@ -86,20 +92,23 @@ new_contact_list_cb (BonoboUIComponent *uih, void *user_data, const char *path)
 	EBook *book;
 	AddressbookView *view = (AddressbookView *) user_data;
 
-	gtk_object_get(GTK_OBJECT(view->view),
-		       "book", &book,
-		       NULL);
+	if (view->view) {
+		gtk_object_get(GTK_OBJECT(view->view),
+			       "book", &book,
+			       NULL);
 
-	g_assert (E_IS_BOOK (book));
+		g_assert (E_IS_BOOK (book));
 
-	e_addressbook_show_contact_list_editor (book, e_card_new(""), TRUE, e_addressbook_view_can_create(view->view));
+		e_addressbook_show_contact_list_editor (book, e_card_new(""), TRUE, e_addressbook_view_can_create(view->view));
+	}
 }
 
 static void
 save_contact_cb (BonoboUIComponent *uih, void *user_data, const char *path)
 {
 	AddressbookView *view = (AddressbookView *) user_data;
-	e_addressbook_view_save_as(view->view);
+	if (view->view)
+		e_addressbook_view_save_as(view->view);
 }
 
 static void
@@ -113,77 +122,88 @@ search_cb (BonoboUIComponent *uih, void *user_data, const char *path)
 {
 	AddressbookView *view = (AddressbookView *) user_data;
 
-	gtk_widget_show(e_addressbook_search_dialog_new(view->view));
+	if (view->view)
+		gtk_widget_show(e_addressbook_search_dialog_new(view->view));
 }
 
 static void
 delete_contact_cb (BonoboUIComponent *uih, void *user_data, const char *path)
 {
 	AddressbookView *view = (AddressbookView *) user_data;
-	e_addressbook_view_delete_selection(view->view);
+	if (view->view)
+		e_addressbook_view_delete_selection(view->view);
 }
 
 static void
 print_cb (BonoboUIComponent *uih, void *user_data, const char *path)
 {
 	AddressbookView *view = (AddressbookView *) user_data;
-	e_addressbook_view_print(view->view);
+	if (view->view)
+		e_addressbook_view_print(view->view);
 }
 
 static void
 print_preview_cb (BonoboUIComponent *uih, void *user_data, const char *path)
 {
 	AddressbookView *view = (AddressbookView *) user_data;
-	e_addressbook_view_print_preview(view->view);
+	if (view->view)
+		e_addressbook_view_print_preview(view->view);
 }
 
 static void
 stop_loading_cb (BonoboUIComponent *uih, void *user_data, const char *path)
 {
 	AddressbookView *view = (AddressbookView *) user_data;
-	e_addressbook_view_stop(view->view);
+	if (view->view)
+		e_addressbook_view_stop(view->view);
 }
 
 static void
 cut_contacts_cb (BonoboUIComponent *uih, void *user_data, const char *path)
 {
 	AddressbookView *view = (AddressbookView *) user_data;
-	e_addressbook_view_cut(view->view);
+	if (view->view)
+		e_addressbook_view_cut(view->view);
 }
 
 static void
 copy_contacts_cb (BonoboUIComponent *uih, void *user_data, const char *path)
 {
 	AddressbookView *view = (AddressbookView *) user_data;
-	e_addressbook_view_copy(view->view);
+	if (view->view)
+		e_addressbook_view_copy(view->view);
 }
 
 static void
 paste_contacts_cb (BonoboUIComponent *uih, void *user_data, const char *path)
 {
 	AddressbookView *view = (AddressbookView *) user_data;
-	e_addressbook_view_paste(view->view);
+	if (view->view)
+		e_addressbook_view_paste(view->view);
 }
 
 static void
 select_all_contacts_cb (BonoboUIComponent *uih, void *user_data, const char *path)
 {
 	AddressbookView *view = (AddressbookView *) user_data;
-	e_addressbook_view_select_all (view->view);
+	if (view->view)
+		e_addressbook_view_select_all (view->view);
 }
 
 static void
 send_contact_cb (BonoboUIComponent *uih, void *user_data, const char *path)
 {
 	AddressbookView *view = (AddressbookView *) user_data;
-	e_addressbook_view_send(view->view);
+	if (view->view)
+		e_addressbook_view_send (view->view);
 }
 
 static void
 send_contact_to_cb (BonoboUIComponent *uih, void *user_data, const char *path)
 {
 	AddressbookView *view = (AddressbookView *) user_data;
-	e_addressbook_view_send_to(view->view);
+	if (view->view)
+		e_addressbook_view_send_to (view->view);
 }
 
 static void
@@ -195,7 +215,15 @@ forget_passwords_cb (BonoboUIComponent *uih, void *user_data, const char *path)
 static void
 update_command_state (EAddressbookView *eav, AddressbookView *view)
 {
-	BonoboUIComponent *uic = bonobo_control_get_ui_component (view->control);
+	BonoboUIComponent *uic;
+
+	if (view->view == NULL)
+		return;
+
+	addressbook_view_ref (view);
+
+	uic = bonobo_control_get_ui_component (view->control);
+	
 
 	/* New Contact */
 	bonobo_ui_component_set_prop (uic,
@@ -263,6 +291,8 @@ update_command_state (EAddressbookView *eav, AddressbookView *view)
 				      "/commands/ContactStop",
 				      "sensitive",
 				      e_addressbook_view_can_stop (view->view) ? "1" : "0", NULL);
+
+	addressbook_view_unref (view);
 }
 
 static void
@@ -366,21 +396,51 @@ control_activate_cb (BonoboControl *control,
 }
 
 static void
-addressbook_view_free(AddressbookView *view)
+addressbook_view_ref (AddressbookView *view)
+{
+	g_assert (view->refs > 0);
+	++view->refs;
+}
+
+static void
+addressbook_view_unref (AddressbookView *view)
+{
+	g_assert (view->refs > 0);
+	--view->refs;
+	if (view->refs == 0)
+		g_free (view);
+}
+
+static void
+addressbook_view_clear (AddressbookView *view)
 {
 	EBook *book;
-	
-	gtk_object_get(GTK_OBJECT(view->view),
-		       "book", &book,
-		       NULL);
-	if (view->uri)
+
+	if (view->uri && view->view) {
+		gtk_object_get(GTK_OBJECT(view->view),
+			       "book", &book,
+			       NULL);
 		gtk_object_unref (GTK_OBJECT (book));
+	}
 	
-	if (view->properties)
-		bonobo_object_unref(BONOBO_OBJECT(view->properties));
+	if (view->properties) {
+		bonobo_object_unref (BONOBO_OBJECT(view->properties));
+		view->properties = NULL;
+	}
+
+	if (view->view) {
+		gtk_widget_destroy (GTK_WIDGET (view->view));
+		view->view = NULL;
+	}
+		
 	g_free(view->passwd);
+	view->passwd = NULL;
+
 	g_free(view->uri);
-	g_free(view);
+	view->uri = NULL;
+
+	if (view->refs == 0)
+		g_free(view);
 }
 
 static void
@@ -447,10 +507,14 @@ book_open_cb (EBook *book, EBookStatus status, gpointer closure)
 	}
 }
 
-static void destroy_callback(GtkWidget *widget, gpointer data)
+static void
+destroy_callback(GtkWidget *widget, gpointer data)
 {
 	AddressbookView *view = data;
-	addressbook_view_free(view);
+	if (view->view && view->view->model && view->view->model->book_view)
+		e_book_view_stop (view->view->model->book_view);
+	addressbook_view_clear (view);
+	addressbook_view_unref (view);
 }
 
 static void
@@ -863,6 +927,7 @@ addressbook_factory_new_control (void)
 	gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
 
 	view = g_new0 (AddressbookView, 1);
+	view->refs = 1;
 
 	view->vbox = gtk_vbox_new (FALSE, 0);
 
diff --git a/addressbook/gui/widgets/e-addressbook-model.c b/addressbook/gui/widgets/e-addressbook-model.c
index fd67d5fd23..a93ae6aa28 100644
--- a/addressbook/gui/widgets/e-addressbook-model.c
+++ b/addressbook/gui/widgets/e-addressbook-model.c
@@ -75,8 +75,9 @@ remove_book_view(EAddressbookModel *model)
 
 	model->search_in_progress = FALSE;
 
-	if (model->book_view)
+	if (model->book_view) {
 		gtk_object_unref(GTK_OBJECT(model->book_view));
+	}
 
 	model->book_view = NULL;
 }
@@ -87,8 +88,10 @@ addressbook_destroy(GtkObject *object)
 	EAddressbookModel *model = E_ADDRESSBOOK_MODEL(object);
 	int i;
 
-	if (model->get_view_idle)
+	if (model->get_view_idle) {
 		g_source_remove(model->get_view_idle);
+		model->get_view_idle = 0;
+	}
 
 	remove_book_view(model);
 
@@ -100,12 +103,15 @@ addressbook_destroy(GtkObject *object)
 		model->writable_status_id = 0;
 
 		gtk_object_unref(GTK_OBJECT(model->book));
+		model->book = NULL;
 	}
 
 	for ( i = 0; i < model->data_count; i++ ) {
 		gtk_object_unref(GTK_OBJECT(model->data[i]));
 	}
+
 	g_free(model->data);
+	model->data = NULL;
 }
 
 static void
diff --git a/addressbook/gui/widgets/e-addressbook-view.c b/addressbook/gui/widgets/e-addressbook-view.c
index 8c0bed0939..c12e14dcbe 100644
--- a/addressbook/gui/widgets/e-addressbook-view.c
+++ b/addressbook/gui/widgets/e-addressbook-view.c
@@ -257,12 +257,18 @@ e_addressbook_view_destroy (GtkObject *object)
 {
 	EAddressbookView *eav = E_ADDRESSBOOK_VIEW(object);
 
-	if (eav->model)
+	if (eav->model) {
 		gtk_object_unref(GTK_OBJECT(eav->model));
+		eav->model = NULL;
+	}
 
-	if (eav->book)
+	if (eav->book) {
 		gtk_object_unref(GTK_OBJECT(eav->book));
+		eav->book = NULL;
+	}
+
 	g_free(eav->query);
+	eav->query = NULL;
 
 	if (eav->view_collection) {
 		gtk_object_unref (GTK_OBJECT (eav->view_collection));
@@ -280,8 +286,10 @@ e_addressbook_view_destroy (GtkObject *object)
 		eav->clipboard_cards = NULL;
 	}
 		
-	if (eav->invisible)
+	if (eav->invisible) {
 		gtk_widget_destroy (eav->invisible);
+		eav->invisible = NULL;
+	}
 
 	if (GTK_OBJECT_CLASS(parent_class)->destroy)
 		GTK_OBJECT_CLASS(parent_class)->destroy(object);
@@ -858,8 +866,9 @@ writable_status (GtkObject *object, gboolean writable, EAddressbookView *eav)
 static void
 command_state_change (EAddressbookView *eav)
 {
-	gtk_signal_emit (GTK_OBJECT (eav),
-			 e_addressbook_view_signals [COMMAND_STATE_CHANGE]);
+	gtk_object_ref (GTK_OBJECT (eav)); /* who knows what might happen during this emission? */
+	gtk_signal_emit (GTK_OBJECT (eav), e_addressbook_view_signals [COMMAND_STATE_CHANGE]);
+	gtk_object_unref (GTK_OBJECT (eav));
 }
 
 #ifdef JUST_FOR_TRANSLATORS
@@ -1409,6 +1418,8 @@ get_selected_cards (EAddressbookView *view)
 
 	for (iterator = list; iterator; iterator = iterator->next) {
 		iterator->data = e_addressbook_model_card_at (view->model, GPOINTER_TO_INT (iterator->data));
+		if (iterator->data)
+			gtk_object_ref (iterator->data);
 	}
 	list = g_list_reverse (list);
 	return list;
@@ -1485,7 +1496,8 @@ e_addressbook_view_show_all(EAddressbookView *view)
 void
 e_addressbook_view_stop(EAddressbookView *view)
 {
-	e_addressbook_model_stop (view->model);
+	if (view)
+		e_addressbook_model_stop (view->model);
 }
 
 static gboolean
@@ -1503,64 +1515,66 @@ e_addressbook_view_selection_nonempty (EAddressbookView  *view)
 gboolean
 e_addressbook_view_can_create (EAddressbookView  *view)
 {
-	return e_addressbook_model_editable (view->model);
+	return view ? e_addressbook_model_editable (view->model) : FALSE;
 }
 
 gboolean
 e_addressbook_view_can_print (EAddressbookView  *view)
 {
-	return e_addressbook_view_selection_nonempty (view);
+	return view ? e_addressbook_view_selection_nonempty (view) : FALSE;
 }
 
 gboolean
 e_addressbook_view_can_save_as (EAddressbookView  *view)
 {
-	return e_addressbook_view_selection_nonempty (view);
+	return view ? e_addressbook_view_selection_nonempty (view) : FALSE;
 }
 
-gboolean   e_addressbook_view_can_send (EAddressbookView  *view)
+gboolean 
+e_addressbook_view_can_send (EAddressbookView  *view)
 {
-	return e_addressbook_view_selection_nonempty (view);
+	return view ? e_addressbook_view_selection_nonempty (view) : FALSE;
 }
 
-gboolean   e_addressbook_view_can_send_to (EAddressbookView  *view)
+gboolean   
+e_addressbook_view_can_send_to (EAddressbookView  *view)
 {
-	return e_addressbook_view_selection_nonempty (view);
+	return view ? e_addressbook_view_selection_nonempty (view) : FALSE;
 }
 
 gboolean
 e_addressbook_view_can_delete (EAddressbookView  *view)
 {
-	return e_addressbook_view_selection_nonempty (view) && e_addressbook_model_editable (view->model);
+	return view ? e_addressbook_view_selection_nonempty (view) && e_addressbook_model_editable (view->model) : FALSE;
 }
 
 gboolean
 e_addressbook_view_can_cut (EAddressbookView *view)
 {
-	return e_addressbook_view_selection_nonempty (view) && e_addressbook_model_editable (view->model);
+	return view ? e_addressbook_view_selection_nonempty (view) && e_addressbook_model_editable (view->model) : FALSE;
 }
 
 gboolean
 e_addressbook_view_can_copy (EAddressbookView *view)
 {
-	return e_addressbook_view_selection_nonempty (view);
+	return view ? e_addressbook_view_selection_nonempty (view) : FALSE;
 }
 
 gboolean
 e_addressbook_view_can_paste (EAddressbookView *view)
 {
-	return e_addressbook_model_editable (view->model);
+	return view ? e_addressbook_model_editable (view->model) : FALSE;
 }
 
 gboolean
 e_addressbook_view_can_select_all (EAddressbookView *view)
 {
-	return e_addressbook_model_card_count (view->model) != 0;
+	return view ? e_addressbook_model_card_count (view->model) != 0 : FALSE;
 }
 
 gboolean
 e_addressbook_view_can_stop (EAddressbookView  *view)
 {
-	return e_addressbook_model_can_stop (view->model);
+	return view ? e_addressbook_model_can_stop (view->model) : FALSE;
 }