File: examplewindow.h
(For use with gtkmm 4)
#ifndef GTKMM_EXAMPLEWINDOW_H #define GTKMM_EXAMPLEWINDOW_H #include <gtkmm/window.h> #include <gtkmm/comboboxtext.h> #include <gtkmm/liststore.h> class ExampleWindow : public Gtk::Window { public: ExampleWindow(); virtual ~ExampleWindow(); protected: void on_cell_data_extra(const Gtk::TreeModel::const_iterator& iter); //Signal handlers: void on_combo_changed(); //Tree model columns: class ModelColumns : public Gtk::TreeModel::ColumnRecord { public: ModelColumns() { add(m_col_id); add(m_col_name); add(m_col_extra);} Gtk::TreeModelColumn<int> m_col_id; Gtk::TreeModelColumn<Glib::ustring> m_col_name; Gtk::TreeModelColumn<Glib::ustring> m_col_extra; }; ModelColumns m_Columns; //Child widgets: Gtk::ComboBox m_Combo; Gtk::CellRendererText m_cell; Glib::RefPtr<Gtk::ListStore> m_refTreeModel; }; #endif //GTKMM_EXAMPLEWINDOW_H
File: examplewindow.cc
(For use with gtkmm 4)
#include "examplewindow.h" #include <iostream> ExampleWindow::ExampleWindow() { set_title("ComboBox example"); //Create the Tree model: //m_refTreeModel = Gtk::TreeStore::create(m_Columns); m_refTreeModel = Gtk::ListStore::create(m_Columns); m_Combo.set_model(m_refTreeModel); //Fill the ComboBox's Tree Model: auto iter = m_refTreeModel->append(); auto row = *iter; row[m_Columns.m_col_id] = 1; row[m_Columns.m_col_name] = "Billy Bob"; row[m_Columns.m_col_extra] = "something"; m_Combo.set_active(iter); /* auto childrow = *(m_refTreeModel->append(row.children())); childrow[m_Columns.m_col_id] = 11; childrow[m_Columns.m_col_name] = "Billy Bob Junior"; childrow = *(m_refTreeModel->append(row.children())); childrow[m_Columns.m_col_id] = 12; childrow[m_Columns.m_col_name] = "Sue Bob"; */ row = *(m_refTreeModel->append()); row[m_Columns.m_col_id] = 2; row[m_Columns.m_col_name] = "Joey Jojo"; row[m_Columns.m_col_extra] = "yadda"; row = *(m_refTreeModel->append()); row[m_Columns.m_col_id] = 3; row[m_Columns.m_col_name] = "Rob McRoberts"; row[m_Columns.m_col_extra] = ""; /* childrow = *(m_refTreeModel->append(row.children())); childrow[m_Columns.m_col_id] = 31; childrow[m_Columns.m_col_name] = "Xavier McRoberts"; */ //Add the model columns to the Combo (which is a kind of view), //rendering them in the default way: m_Combo.pack_start(m_Columns.m_col_id); m_Combo.pack_start(m_Columns.m_col_name); //An example of adding a cell renderer manually, //instead of using pack_start(model_column, Gtk::PackOptions::EXPAND_WIDGET) //so we have more control: m_Combo.set_cell_data_func(m_cell, sigc::mem_fun(*this, &ExampleWindow::on_cell_data_extra)); m_Combo.pack_start(m_cell); //Add the ComboBox to the window. set_child(m_Combo); //Connect signal handler: m_Combo.signal_changed().connect( sigc::mem_fun(*this, &ExampleWindow::on_combo_changed) ); } ExampleWindow::~ExampleWindow() { } void ExampleWindow::on_cell_data_extra(const Gtk::TreeModel::const_iterator& iter) { auto row = *iter; const Glib::ustring extra = row[m_Columns.m_col_extra]; //Some arbitrary logic just to show that this is where you can do such things: //Transform the value, deciding how to represent it as text: if(extra.empty()) m_cell.property_text() = "(none)"; else m_cell.property_text() = "-" + extra + "-"; //Change other cell renderer properties too: m_cell.property_foreground() = (extra == "yadda" ? "red" : "green"); } void ExampleWindow::on_combo_changed() { const auto iter = m_Combo.get_active(); if(iter) { const auto row = *iter; if(row) { //Get the data for the selected row, using our knowledge of the tree //model: int id = row[m_Columns.m_col_id]; Glib::ustring name = row[m_Columns.m_col_name]; std::cout << " ID=" << id << ", name=" << name << std::endl; } } else std::cout << "invalid iter" << std::endl; }
File: main.cc
(For use with gtkmm 4)
#include "examplewindow.h" #include <gtkmm/application.h> int main(int argc, char *argv[]) { auto app = Gtk::Application::create("org.gtkmm.example"); //Shows the window and returns when it is closed. return app->make_window_and_run<ExampleWindow>(argc, argv); }