Examples
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## Examples

### Simple Example

Figure 9.1. TextView

Source Code

File: examplewindow.h

    #ifndef GTKMM_EXAMPLEWINDOW_H
    #define GTKMM_EXAMPLEWINDOW_H

    #include <gtkmm.h>

    class ExampleWindow : public Gtk::Window
    {
    public:
      ExampleWindow();
      virtual ~ExampleWindow();

    protected:

      virtual void fill_buffers();

      //Signal handlers:
      virtual void on_button_quit();
      virtual void on_button_buffer1();
      virtual void on_button_buffer2();

      //Child widgets:
      Gtk::VBox m_VBox;

      Gtk::ScrolledWindow m_ScrolledWindow;
      Gtk::TextView m_TextView;

      Glib::RefPtr<Gtk::TextBuffer> m_refTextBuffer1, m_refTextBuffer2;

      Gtk::HButtonBox m_ButtonBox;
      Gtk::Button m_Button_Quit, m_Button_Buffer1, m_Button_Buffer2;
    };

    #endif //GTKMM_EXAMPLEWINDOW_H

File: examplewindow.cc

    #include "examplewindow.h"

    ExampleWindow::ExampleWindow()
    : m_Button_Quit(Gtk::Stock::QUIT),
      m_Button_Buffer1("Use buffer 1"),
      m_Button_Buffer2("Use buffer 2")
    {
      set_title("Gtk::TextView example");
      set_border_width(5);
      set_default_size(400, 200);

      add(m_VBox);

      //Add the TreeView, inside a ScrolledWindow, with the button underneath:
      m_ScrolledWindow.add(m_TextView);

      //Only show the scrollbars when they are necessary:
      m_ScrolledWindow.set_policy(Gtk::POLICY_AUTOMATIC, Gtk::POLICY_AUTOMATIC);

      m_VBox.pack_start(m_ScrolledWindow);

      //Add buttons:
      m_VBox.pack_start(m_ButtonBox, Gtk::PACK_SHRINK);

      m_ButtonBox.pack_start(m_Button_Buffer1, Gtk::PACK_SHRINK);
      m_ButtonBox.pack_start(m_Button_Buffer2, Gtk::PACK_SHRINK);
      m_ButtonBox.pack_start(m_Button_Quit, Gtk::PACK_SHRINK);
      m_ButtonBox.set_border_width(5);
      m_ButtonBox.set_spacing(5);
      m_ButtonBox.set_layout(Gtk::BUTTONBOX_END);

      //Connect signals:
      m_Button_Quit.signal_clicked().connect( SigC::slot(*this, &ExampleWindow::on_button_quit) );
      m_Button_Buffer1.signal_clicked().connect( SigC::slot(*this, &ExampleWindow::on_button_buffer1) );
      m_Button_Buffer2.signal_clicked().connect( SigC::slot(*this, &ExampleWindow::on_button_buffer2) );

      fill_buffers();
      on_button_buffer1();

      show_all_children();
    }

    void ExampleWindow::fill_buffers()
    {
      //Create the first TextBuffer:
      m_refTextBuffer1 = Gtk::TextBuffer::create();
      m_refTextBuffer1->set_text("This is the text from TextBuffer #1.");

      //Create a TagTable:
      Glib::RefPtr<Gtk::TextBuffer::TagTable> refTagTable = m_refTextBuffer1->get_tag_table();

      //Apply color to some text.

      //Create the tags:
      Glib::RefPtr<Gtk::TextBuffer::Tag> refTagOrange = Gtk::TextBuffer::Tag::create("example-orange"); //We give it an arbitrary name.
      refTagOrange->property_background() = "orange";
      refTagTable->add(refTagOrange);

      Glib::RefPtr<Gtk::TextBuffer::Tag> refTagBold = Gtk::TextBuffer::Tag::create("example-bold"); //We give it an arbitrary name.
      refTagBold->property_weight() = Pango::WEIGHT_BOLD;
      refTagTable->add(refTagBold);

      //Use a tag:
      m_refTextBuffer1->apply_tag(refTagOrange, m_refTextBuffer1->begin(), m_refTextBuffer1->get_iter_at_offset(4));

      //Fill the second buffer, using the tags as we add the text:
      m_refTextBuffer2 = Gtk::TextBuffer::create(refTagTable); //share the TagTable. A future gtkmm will have a set_tag_table() method.
      m_refTextBuffer2->set_text("This is some alternative text, from TextBuffer #2.");
      m_refTextBuffer2->insert_with_tag(m_refTextBuffer2->end(), "\nAnd here is some more", refTagOrange);
      m_refTextBuffer2->insert_with_tag(m_refTextBuffer2->end(), "\nAnd some more.", refTagBold);
    }

    ExampleWindow::~ExampleWindow()
    {
    }

    void ExampleWindow::on_button_quit()
    {
      hide();
    }

    void ExampleWindow::on_button_buffer1()
    {
      m_TextView.set_buffer(m_refTextBuffer1);
    }

    void ExampleWindow::on_button_buffer2()
    {
      m_TextView.set_buffer(m_refTextBuffer2);
    }

File: main.cc

    #include <gtkmm/main.h>
    #include "examplewindow.h"

    int main(int argc, char *argv[])
    {
      Gtk::Main kit(argc, argv);

      ExampleWindow window;
      Gtk::Main::run(window); //Shows the window and returns when it is closed.

      return 0;
    }

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