1 /* Color Chooser
2 *
3 * Gtk::ColorChooserDialog lets the user choose a color.
4 *
5 */
6
7 #include <gtkmm.h>
8
9 class Example_ColorSel : public Gtk::Window
10 {
11 public:
12 Example_ColorSel();
13 ~Example_ColorSel() override;
14
15 protected:
16 //Signal handlers:
17 void on_button_clicked();
18 bool on_drawing_area_draw(const Cairo::RefPtr<Cairo::Context>& cr);
19
20 //Member widgets:
21 Gtk::Box m_VBox;
22 Gtk::Frame m_Frame;
23 Gtk::DrawingArea m_DrawingArea;
24 Gtk::Button m_Button;
25 Gdk::RGBA m_Color;
26 };
27
28 //Called by DemoWindow;
do_colorsel()29 Gtk::Window* do_colorsel()
30 {
31 return new Example_ColorSel();
32 }
33
Example_ColorSel()34 Example_ColorSel::Example_ColorSel()
35 : m_VBox(Gtk::ORIENTATION_VERTICAL, 8),
36 m_Button("_Change the above color", true)
37 {
38 set_title("Color Chooser");
39 set_border_width(8);
40
41 m_VBox.set_border_width(8);
42 add(m_VBox);
43
44 // Create the color swatch area
45 m_Frame.set_shadow_type(Gtk::SHADOW_IN);
46 m_VBox.pack_start(m_Frame);
47
48 // set a fixed size
49 m_DrawingArea.set_size_request(200, 200);
50
51 // set the color
52 m_Color.set_rgba(0, 0, 1, 1);
53 m_DrawingArea.signal_draw().connect(sigc::mem_fun(*this, &Example_ColorSel::on_drawing_area_draw));
54
55 m_Frame.add(m_DrawingArea);
56
57 m_Button.set_halign(Gtk::ALIGN_END);
58 m_Button.set_valign(Gtk::ALIGN_CENTER);
59
60 m_VBox.pack_start(m_Button, Gtk::PACK_SHRINK);
61
62 m_Button.signal_clicked().connect(sigc::mem_fun(*this, &Example_ColorSel::on_button_clicked));
63
64 show_all();
65 }
66
~Example_ColorSel()67 Example_ColorSel::~Example_ColorSel()
68 {
69 }
70
on_button_clicked()71 void Example_ColorSel::on_button_clicked()
72 {
73 Gtk::ColorChooserDialog dialog("Changing color");
74 dialog.set_transient_for(*this);
75 dialog.set_rgba(m_Color);
76
77 const int response = dialog.run();
78
79 if(response == Gtk::RESPONSE_OK)
80 {
81 m_Color = dialog.get_rgba();
82 }
83 }
84
on_drawing_area_draw(const Cairo::RefPtr<Cairo::Context> & cr)85 bool Example_ColorSel::on_drawing_area_draw(const Cairo::RefPtr<Cairo::Context>& cr)
86 {
87 Gdk::Cairo::set_source_rgba(cr, m_Color);
88 cr->paint();
89
90 return true;
91 }
92
93