<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Full Example</title> <link rel="stylesheet" type="text/css" href="style.css"> <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> <link rel="home" href="index.html" title="Programming with gtkmm 3"> <link rel="up" href="chapter-combobox.html" title="Chapter 10. Combo Boxes"> <link rel="prev" href="sec-combobox-changes.html" title="Responding to changes"> <link rel="next" href="combobox-example-simple.html" title="Simple Text Example"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr><th colspan="3" align="center">Full Example</th></tr> <tr> <td width="20%" align="left"> <a accesskey="p" href="sec-combobox-changes.html"><img src="icons/prev.png" alt="Prev"></a> </td> <th width="60%" align="center">Chapter 10. Combo Boxes</th> <td width="20%" align="right"> <a accesskey="n" href="combobox-example-simple.html"><img src="icons/next.png" alt="Next"></a> </td> </tr> </table> <hr> </div> <div class="sect1"> <div class="titlepage"><div><div><h2 class="title" style="clear: both"> <a name="combobox-example-full"></a>Full Example</h2></div></div></div> <div class="figure"> <a name="figure-combobox-complex"></a><p class="title"><b>Figure 10.1. ComboBox</b></p> <div class="figure-contents"><div class="screenshot"><div><img src="figures/combobox_complex.png" alt="ComboBox"></div></div></div> </div> <br class="figure-break"><p><a class="ulink" href="http://git.gnome.org/browse/gtkmm-documentation/tree/examples/book/combobox/complex?h=gtkmm-3-24" target="_top">Source Code</a></p> <p>File: <code class="filename">examplewindow.h</code> (For use with gtkmm 3, not gtkmm 2) </p> <pre class="programlisting"> #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 </pre> <p>File: <code class="filename">main.cc</code> (For use with gtkmm 3, not gtkmm 2) </p> <pre class="programlisting"> #include "examplewindow.h" #include <gtkmm/application.h> int main(int argc, char *argv[]) { auto app = Gtk::Application::create(argc, argv, "org.gtkmm.example"); ExampleWindow window; //Shows the window and returns when it is closed. return app->run(window); } </pre> <p>File: <code class="filename">examplewindow.cc</code> (For use with gtkmm 3, not gtkmm 2) </p> <pre class="programlisting"> #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: Gtk::TreeModel::Row row = *(m_refTreeModel->append()); 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(row); /* Gtk::TreeModel::Row 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) //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. add(m_Combo); //Connect signal handler: m_Combo.signal_changed().connect( sigc::mem_fun(*this, &ExampleWindow::on_combo_changed) ); show_all_children(); } 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() { Gtk::TreeModel::iterator iter = m_Combo.get_active(); if(iter) { Gtk::TreeModel::Row 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; } </pre> </div> <div class="navfooter"> <hr> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"> <a accesskey="p" href="sec-combobox-changes.html"><img src="icons/prev.png" alt="Prev"></a> </td> <td width="20%" align="center"><a accesskey="u" href="chapter-combobox.html"><img src="icons/up.png" alt="Up"></a></td> <td width="40%" align="right"> <a accesskey="n" href="combobox-example-simple.html"><img src="icons/next.png" alt="Next"></a> </td> </tr> <tr> <td width="40%" align="left" valign="top">Responding to changes </td> <td width="20%" align="center"><a accesskey="h" href="index.html"><img src="icons/home.png" alt="Home"></a></td> <td width="40%" align="right" valign="top"> Simple Text Example</td> </tr> </table> </div> </body> </html>