/* Color Chooser
*
* Gtk::ColorChooserDialog lets the user choose a color.
*
*/
#include <gtkmm.h>
class Example_ColorSel : public Gtk::Window
{
public:
Example_ColorSel();
~Example_ColorSel() override;
protected:
//Signal handlers:
void on_button_clicked();
bool on_drawing_area_draw(const Cairo::RefPtr<Cairo::Context>& cr);
//Member widgets:
Gtk::Box m_VBox;
Gtk::Frame m_Frame;
Gtk::DrawingArea m_DrawingArea;
Gtk::Button m_Button;
Gdk::RGBA m_Color;
};
//Called by DemoWindow;
Gtk::Window* do_colorsel()
{
return new Example_ColorSel();
}
Example_ColorSel::Example_ColorSel()
: m_VBox(Gtk::ORIENTATION_VERTICAL, 8),
m_Button("_Change the above color", true)
{
set_title("Color Chooser");
set_border_width(8);
m_VBox.set_border_width(8);
add(m_VBox);
// Create the color swatch area
m_Frame.set_shadow_type(Gtk::SHADOW_IN);
m_VBox.pack_start(m_Frame);
// set a fixed size
m_DrawingArea.set_size_request(200, 200);
// set the color
m_Color.set_rgba(0, 0, 1, 1);
m_DrawingArea.signal_draw().connect(sigc::mem_fun(*this, &Example_ColorSel::on_drawing_area_draw));
m_Frame.add(m_DrawingArea);
m_Button.set_halign(Gtk::ALIGN_END);
m_Button.set_valign(Gtk::ALIGN_CENTER);
m_VBox.pack_start(m_Button, Gtk::PACK_SHRINK);
m_Button.signal_clicked().connect(sigc::mem_fun(*this, &Example_ColorSel::on_button_clicked));
show_all();
}
Example_ColorSel::~Example_ColorSel()
{
}
void Example_ColorSel::on_button_clicked()
{
Gtk::ColorChooserDialog dialog("Changing color");
dialog.set_transient_for(*this);
dialog.set_rgba(m_Color);
const int response = dialog.run();
if(response == Gtk::RESPONSE_OK)
{
m_Color = dialog.get_rgba();
}
}
bool Example_ColorSel::on_drawing_area_draw(const Cairo::RefPtr<Cairo::Context>& cr)
{
Gdk::Cairo::set_source_rgba(cr, m_Color);
cr->paint();
return true;
}