CODEWITHSUNDEEP
cgtkrefreshwidget
TheUnexpected
TheUnexpected

Reputation: 3165

Remove GTK+ container children, repopulate it, then refresh

I'm into a problem with a GTK+ C application. I have a container that, when starting the application, contains a button. During the running an user interation must cause this widget to contain more of them.
I need to write a function that removes all the "old" inner buttons, then adds all the ones from a list and finally refresh the view. This is what I'm writing but some parts are missing (TODOs)

void refresh_sequence_panel() 
{
    GSList* iterator = NULL;
    GtkWidget* button;

    // TODO: Here the container must be empty

    // Now add all the buttons
    for (iterator = steps; iterator; iterator = iterator->next) {
       button = gtk_button_new_from_stock(GTK_STOCK_ADD);
       gtk_widget_set_size_request(button, SEQ_BUTTON_W, SEQ_BUTTON_H);
       gtk_box_pack_start(GTK_BOX(sequence_panel), button, FALSE, FALSE, 5);
       handler_id = g_signal_connect(G_OBJECT(button), "clicked", G_CALLBACK(seq_popup), GTK_BOX(sequence_panel));
    }

    // TODO: Now refresh the view, so I can see the changes...
}

Hope that someone can help, thanks!

Upvotes: 10

Views: 16056

Answers (4)

GingerPlusPlus
GingerPlusPlus

Reputation: 5606

One-liner:

gtk_container_foreach (GTK_CONTAINER (container), (void*) gtk_widget_destroy, NULL);

Upvotes: 1

Lautaro
Lautaro

Reputation: 113

This one worked for me (it's a variation of unwind's answer):

Glib::ListHandle<Widget*> childList = this->get_children();
Glib::ListHandle<Widget*>::iterator it = childList.begin();

while (it != childList.end()) {
    remove(*(*it));
    it++;
}

(GTKMM 2.4)

Upvotes: 0

mili
mili

Reputation: 3802

Here is the method that I followed. Because I am using gtkmm on c++

Gtk::Box_Helpers::BoxList *childList = &vboxImgLst->children();
Box_Helpers::BoxList::iterator start = childList->begin();
Box_Helpers::BoxList::iterator end = childList->end();

childList->erase(start, end);

where vboxImgLst is,

VBox *vboxImgLst;

Hope this will help to someone who are using gtkmm and c++.

Thanks

Upvotes: 0

unwind
unwind

Reputation: 399833

Removing all children:

GList *children, *iter;

children = gtk_container_get_children(GTK_CONTAINER(container));
for(iter = children; iter != NULL; iter = g_list_next(iter))
  gtk_widget_destroy(GTK_WIDGET(iter->data));
g_list_free(children);

Note that the above just deletes each child widget directly, rather than asking the container to remove it (with gtk_container_remove()), this is recommended by the documentation and matches what you intend, so it's fine in my opinion.

There's no point in "refreshing the view", as long as you actually add and show the newly built widgets to the container. GTK+ is event-based, and adding children to a container makes the container realize it needs to refresh its visual appearance automatically.

Upvotes: 16

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