Re: Gtk::ToggleButton

["Andrew E. Makeev" <andrew solvo ru>]

Alex Buell wrote:

> Following a recent post about Gtk::Button and changing its state to
> depressed and redrawing with different colours, I wrote the code as
> below. I can initially set the colour when creating the button, but
> I don't seem to be able to change its colour later - see set_color().
> Any ideas on how I can force the button to redraw itself with new color?
> Thanks.
>
> #include <iostream>
> #include <gtkmm.h>
>
> namespace Gtk
> {
> 	class DepressedToggleButton : public Gtk::ToggleButton
> 	{
> 	public:
> 		DepressedToggleButton() : color(Gdk::Color("grey")) {}
> 		DepressedToggleButton(Gdk::Color c) : color(c) {}
> 		~DepressedToggleButton() {}
>
>  
Why did you use Gtk:STATE_INSENSITIVE only? You had to use all possible 
button states with appropriate color values to see different background.

> 		void set_color(Gdk::Color c) 
> 		{ 
> 			color = c;
> 			modify_bg(Gtk::STATE_INSENSITIVE, color);
> 			queue_draw(); // need to force the button to
> redraw with new color - HOW?!? }
>
> 		Gdk::Color get_color()
> 		{
> 			return color;
> 		}
>
> 	protected:
> 		virtual bool on_expose_event(GdkEventExpose* event);
> 		Gdk::Color color;
> 	};
>
>  
you don't need to override on_expose_event to change color.

> 	bool DepressedToggleButton::on_expose_event(GdkEventExpose*
> event) {
> 		modify_bg(Gtk::STATE_INSENSITIVE, color);
> 		return Gtk::Widget::on_expose_event(event);
> 	}
> }
>
> class TestButton : public Gtk::Window
> {
> public:
> 	TestButton();
> 	~TestButton();
>
> protected:
> 	void HandleButton(int i);
>
> 	Gtk::VBox m_VBox;
> 	Gtk::HButtonBox m_HButtonBox;
> 	Gtk::DepressedToggleButton m_DepressedToggleButton[3];
>
> private:
> 	bool state;
> };
>
> TestButton::TestButton() :
> 	state(false)
> {
> 	set_title("DepressedToggleButton");
> 	add(m_VBox);
>
> 	m_HButtonBox.set_border_width(5);
> 	m_HButtonBox.set_layout(Gtk::BUTTONBOX_END);
> 	m_HButtonBox.set_spacing(5);
>
> 	m_DepressedToggleButton[0].set_label("First");
> 	m_DepressedToggleButton[0].set_color(Gdk::Color("red"));
> 	m_DepressedToggleButton[1].set_label("Second");
> 	m_DepressedToggleButton[1].set_color(Gdk::Color("blue"));
> 	m_DepressedToggleButton[2].set_label("Third");
> 	m_DepressedToggleButton[2].set_color(Gdk::Color("green"));
>
> 	for (int i = 0; i < 3; i++)
> 	{
> 		m_DepressedToggleButton[i].signal_clicked().connect(
> 			sigc::bind<int>(sigc::mem_fun(*this,
> &TestButton::HandleButton), i)); m_HButtonBox.add
> (m_DepressedToggleButton[i]); }
>
> 	m_VBox.pack_start(m_HButtonBox, Gtk::BUTTONBOX_END, 0);
>
> 	set_resizable(false);
> 	show_all_children();
> }
>
> TestButton::~TestButton()
> {
> }
>
> int main(int argc, char *argv[])
> {
> 	Gtk::Main app(argc, argv);
>
> 	TestButton test;
> 	Gtk::Main::run(test);
> 	return 0;
> }
>
>
> void TestButton::HandleButton(int i)
> {
> 	std::cout << "Button " << i << " clicked!\n";
> }
> 	
>
>
>