I like option 2. Strange that I didn't think of it, as this exactly what
I usually do for std::vector (although the performance of deleting from
the middle of a vector is obviously not good)
David Nečas (Yeti) wrote:
> On Fri, Jul 21, 2006 at 11:23:40PM +0100, Christopher Backhouse wrote:
>> so - I loop through the selection, converting all the paths into
>> references and put them in a new list.
>> Then I loop through that list, convert the references back to iters so i
>> can remove them from the tree.
>> It also seems to be impossible to convert a reference to an iter - so I
>> have to go via a path.
>> All in all not the prettiest code, but at least it works.
>> If there is a neater solution I would be happy to hear about it
>
> This method is quite general, but it has indeed a large
> overhead. See the attached example for two simplier
> methods.
>
> Yeti
>
>
> --
> Anonyms eat their boogers.
>
>
> ==========================================================================
> #include <gtk/gtk.h>
>
> static void
> add_iter(GtkTreeModel *model,
> GtkTreePath *path,
> GtkTreeIter *piter,
> gpointer userdata)
> {
> GArray *sel = (GArray*)userdata;
> GtkTreeIter iter = *piter;
>
> g_array_append_val(sel, iter);
> }
>
> static void
> remove1(GtkTreeSelection *selection)
> {
> GtkTreeView *treeview;
> GtkListStore *store;
> GArray *sel;
> guint i;
>
> treeview = gtk_tree_selection_get_tree_view(selection);
> store = GTK_LIST_STORE(gtk_tree_view_get_model(treeview));
>
> sel = g_array_new(FALSE, FALSE, sizeof(GtkTreeIter));
> /* This needs persistent iters */
> gtk_tree_selection_selected_foreach(selection, add_iter, sel);
> gtk_tree_selection_unselect_all(selection);
> for (i = 0; i < sel->len; i++) {
> GtkTreeIter *iter = &g_array_index(sel, GtkTreeIter, i);
>
> gtk_list_store_remove(store, iter);
> }
> g_array_free(sel, TRUE);
> }
>
> static void
> remove2(GtkTreeSelection *selection)
> {
> GtkTreeModel *model;
> GtkListStore *store;
> GList *sel, *l;
>
> sel = gtk_tree_selection_get_selected_rows(selection, &model);
> gtk_tree_selection_unselect_all(selection);
> store = GTK_LIST_STORE(model);
> /* This assumes paths are in order. Although it works there is no such
> * guarantee in Gtk+ API docs, so maybe a sort is necessary. */
> sel = g_list_reverse(sel);
> for (l = sel; l; l = g_list_next(l)) {
> GtkTreeIter iter;
> GtkTreePath *path = (GtkTreePath*)l->data;
>
> gtk_tree_model_get_iter(model, &iter, path);
> gtk_list_store_remove(store, &iter);
> gtk_tree_path_free(path);
> }
> g_list_free(sel);
> }
>
> /* This is gross */
> static void
> fill(GtkListStore *store)
> {
> GtkTreeIter iter;
> guint i;
>
> gtk_list_store_clear(store);
>
> for (i = 0; i < 20; i++) {
> gtk_list_store_append(store, &iter);
> gtk_list_store_set(store, &iter, 0, i, -1);
> }
> }
>
> int
> main(int argc, char *argv[])
> {
> GtkWidget *window, *treeview, *vbox, *button;
> GtkTreeViewColumn *column;
> GtkCellRenderer *renderer;
> GtkTreeSelection *selection;
> GtkListStore *store;
>
> gtk_init(&argc, &argv);
>
> store = gtk_list_store_new(1, G_TYPE_UINT);
> fill(store);
>
> window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
> g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL);
>
> vbox = gtk_vbox_new(FALSE, 0);
> gtk_container_add(GTK_CONTAINER(window), vbox);
>
> treeview = gtk_tree_view_new_with_model(GTK_TREE_MODEL(store));
> gtk_tree_view_set_headers_visible(GTK_TREE_VIEW(treeview), FALSE);
>
> renderer = gtk_cell_renderer_text_new();
> column = gtk_tree_view_column_new();
> gtk_cell_layout_pack_start(GTK_CELL_LAYOUT(column), renderer, TRUE);
> gtk_cell_layout_add_attribute(GTK_CELL_LAYOUT(column), renderer, "text",
> 0);
> gtk_tree_view_append_column(GTK_TREE_VIEW(treeview), column);
> gtk_box_pack_start(GTK_BOX(vbox), treeview, TRUE, TRUE, 0);
>
> selection = gtk_tree_view_get_selection(GTK_TREE_VIEW(treeview));
> gtk_tree_selection_set_mode(selection, GTK_SELECTION_MULTIPLE);
>
> button = gtk_button_new_from_stock(GTK_STOCK_REMOVE);
> gtk_box_pack_start(GTK_BOX(vbox), button, FALSE, FALSE, 0);
> g_signal_connect_swapped(button, "clicked", G_CALLBACK(remove1),
> selection);
>
> button = gtk_button_new_from_stock(GTK_STOCK_DELETE);
> gtk_box_pack_start(GTK_BOX(vbox), button, FALSE, FALSE, 0);
> g_signal_connect_swapped(button, "clicked", G_CALLBACK(remove2),
> selection);
>
> button = gtk_button_new_with_mnemonic("_Fill");
> gtk_box_pack_start(GTK_BOX(vbox), button, FALSE, FALSE, 0);
> g_signal_connect_swapped(button, "clicked", G_CALLBACK(fill), store);
>
> gtk_widget_show_all(window);
> gtk_main();
>
> return 0;
> }
>
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>
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