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/* Size Groups
*
* Gtk::SizeGroup provides a mechanism for grouping a number of
* widgets together so they all request the same amount of space.
* This is typically useful when you want a column of widgets to
* have the same size, but you can't use a Gtk::Grid widget.
*
* Note that size groups only affect the amount of space requested,
* not the size that the widgets finally receive. If you want the
* widgets in a Gtk::SizeGroup to actually be the same size, you need
* to pack them in such a way that they get the size they request
* and not more. For example, if you are packing your widgets
* into a table, you would not include the Gtk::FILL flag.
*/
#include <gtkmm.h>
#include <list>
class Example_SizeGroup : public Gtk::Window
{
public:
Example_SizeGroup();
~Example_SizeGroup() override;
protected:
//Signal handlers:
void on_checkbutton_toggled();
void on_close();
using type_listStrings = std::list<Glib::ustring>;
void add_row(Gtk::Grid& grid, int row, const Glib::RefPtr<Gtk::SizeGroup>& size_group,
const Glib::ustring& label_text, const std::list<Glib::ustring>& options);
Gtk::ComboBoxText* create_combobox(const std::list<Glib::ustring>& strings);
//Member widgets:
Gtk::Frame m_Frame_Color, m_Frame_Line;
Gtk::Box m_VBox;
Glib::RefPtr<Gtk::SizeGroup> m_refSizeGroup;
Gtk::Grid m_Grid_Color, m_Grid_Line;
Gtk::CheckButton m_CheckButton;
Gtk::Button m_CloseButton;
};
//Called by DemoWindow;
Gtk::Window* do_sizegroup()
{
return new Example_SizeGroup();
}
Example_SizeGroup::Example_SizeGroup()
: m_Frame_Color("Color Options"),
m_Frame_Line("Line Options"),
m_VBox(Gtk::ORIENTATION_VERTICAL, 5),
m_CheckButton("_Enable grouping", true),
m_CloseButton("_Close", true)
{
set_title("Gtk::SizeGroup");
set_resizable(false);
add(m_VBox);
m_VBox.set_border_width(5);
m_refSizeGroup = Gtk::SizeGroup::create(Gtk::SIZE_GROUP_HORIZONTAL),
// Create one frame holding color options
m_VBox.pack_start(m_Frame_Color);
m_Grid_Color.set_border_width(5);
m_Grid_Color.set_row_spacing(5);
m_Grid_Color.set_column_spacing(10);
m_Frame_Color.add(m_Grid_Color);
const type_listStrings color_options{"Red", "Green", "Blue"};
add_row(m_Grid_Color, 0, m_refSizeGroup, "_Foreground", color_options);
add_row(m_Grid_Color, 1, m_refSizeGroup, "_Background", color_options);
// and another frame holding line style options
m_VBox.pack_start(m_Frame_Line, Gtk::PACK_SHRINK);
m_Grid_Line.set_border_width(5);
m_Grid_Line.set_row_spacing(5);
m_Grid_Line.set_column_spacing(10);
m_Frame_Line.add(m_Grid_Line);
const type_listStrings dash_options{"Solid", "Dashed", "Dotted"};
add_row(m_Grid_Line, 0, m_refSizeGroup, "_Dashing", dash_options);
const type_listStrings end_options{"Square", "Round", "Double Arrow"};
add_row(m_Grid_Line, 1, m_refSizeGroup, "_Line ends", end_options);
// and a check button to turn grouping on and off
m_VBox.pack_start(m_CheckButton, Gtk::PACK_SHRINK);
m_CheckButton.set_active();
m_CheckButton.signal_toggled().connect(sigc::mem_fun(*this, &Example_SizeGroup::on_checkbutton_toggled));
// and finally a close button
m_VBox.pack_start(m_CloseButton, Gtk::PACK_SHRINK);
m_CloseButton.set_halign(Gtk::ALIGN_END);
m_CloseButton.signal_clicked().connect(sigc::mem_fun(*this, &Example_SizeGroup::on_close));
show_all();
}
Example_SizeGroup::~Example_SizeGroup()
{
}
void Example_SizeGroup::on_checkbutton_toggled()
{
// Gtk::SIZE_GROUP_NONE is not generally useful, but is useful
// here to show the effect of Gtk::SIZE_GROUP_HORIZONTAL by contrast.
Gtk::SizeGroupMode new_mode = Gtk::SIZE_GROUP_HORIZONTAL;
if (!m_CheckButton.get_active())
new_mode = Gtk::SIZE_GROUP_NONE;
m_refSizeGroup->set_mode(new_mode);
}
void Example_SizeGroup::add_row(Gtk::Grid& grid, int row,
const Glib::RefPtr<Gtk::SizeGroup>& size_group,
const Glib::ustring& label_text,
const std::list<Glib::ustring>& options)
{
auto pLabel = Gtk::make_managed<Gtk::Label>(label_text, Gtk::ALIGN_START, Gtk::ALIGN_BASELINE, true);
pLabel->set_hexpand();
grid.attach(*pLabel, 0, row, 1, 1);
auto pComboBoxText = create_combobox(options);
pLabel->set_mnemonic_widget(*pComboBoxText);
pComboBoxText->set_halign(Gtk::ALIGN_END);
pComboBoxText->set_valign(Gtk::ALIGN_BASELINE);
size_group->add_widget(*pComboBoxText);
grid.attach(*pComboBoxText, 1, row, 1, 1);
}
// Convenience function to create an option menu holding a number of strings
Gtk::ComboBoxText* Example_SizeGroup::create_combobox(const std::list<Glib::ustring>& strings)
{
auto pCombo = Gtk::make_managed<Gtk::ComboBoxText>();
for(const auto& str : strings)
{
pCombo->append(str);
}
pCombo->set_active(0);
return pCombo;
}
void Example_SizeGroup::on_close()
{
hide();
}
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