+/** @brief Recursion step for choose_get_visible()
+ * @param parent A visible node, or NULL for the root
+ * @param callback Called for each visible node
+ * @param userdata Passed to @p callback
+ *
+ * If @p callback returns nonzero, the walk stops immediately.
+ */
+static int choose_visible_recurse(GtkTreeIter *parent,
+ int (*callback)(GtkTreeIter *it,
+ int isfile,
+ void *userdata),
+ void *userdata) {
+ int expanded;
+ if(parent) {
+ /* Skip placeholders */
+ if(choose_is_placeholder(parent))
+ return 0;
+ const int isfile = choose_is_file(parent);
+ if(callback(parent, isfile, userdata))
+ return 1;
+ if(isfile)
+ return 0; /* Files never have children */
+ GtkTreePath *parent_path
+ = gtk_tree_model_get_path(GTK_TREE_MODEL(choose_store),
+ parent);
+ expanded = gtk_tree_view_row_expanded(GTK_TREE_VIEW(choose_view),
+ parent_path);
+ gtk_tree_path_free(parent_path);
+ } else
+ expanded = 1;
+ /* See if parent is expanded */
+ if(expanded) {
+ /* Parent is expanded, visit all its children */
+ GtkTreeIter it[1];
+ gboolean itv = gtk_tree_model_iter_children(GTK_TREE_MODEL(choose_store),
+ it,
+ parent);
+ while(itv) {
+ if(choose_visible_recurse(it, callback, userdata))
+ return TRUE;
+ itv = gtk_tree_model_iter_next(GTK_TREE_MODEL(choose_store), it);
+ }
+ }
+ return 0;
+}
+
+static void choose_visible_visit(int (*callback)(GtkTreeIter *it,
+ int isfile,
+ void *userdata),
+ void *userdata) {
+ choose_visible_recurse(NULL, callback, userdata);
+}
+
+static int choose_selectall_sensitive_callback
+ (GtkTreeIter attribute((unused)) *it,
+ int isfile,
+ void *userdata) {
+ if(isfile) {
+ *(int *)userdata = 1;
+ return 1;
+ }
+ return 0;
+}
+
+/** @brief Should 'select all' be sensitive?
+ *
+ * Yes if there are visible files.
+ */