void MyFrame::OnUpdateButton(wxUpdateUIEvent& event) { if (m_textCtrl->IsEmpty()) { event.Enable(false); // disable the button if the textctrl is empty } else { event.Enable(true); // enable the button if the textctrl is not empty } } void MyFrame::OnButton(wxCommandEvent& event) { // do something }
void MyFrame::OnUpdateMenuItem(wxUpdateUIEvent& event) { event.Skip(); // skip updating the menu item for now } void MyFrame::OnMenuItem(wxCommandEvent& event) { // do something }In this example, wxUpdateUIEvent is being used to update a menu item's status. The OnUpdateMenuItem function is called whenever the UI needs to be updated, but it is skipping the update for now. The menu item's OnMenuItem function is only called when the menu item is clicked and the UI is not being updated. Package/library: wxWidgets