Re: Change background color when mouse over

[José Alburquerque <jaalburquerque cox net>]

Germán Diago wrote:
> Hello. I'm implementing a custom widget, which is a Gtk::VBox and
> contains a Gtk::Image and a label.
>
> I want the widget to change color when the mouse goes over it (I just
> want to change the VBox zone)
> Looking at the documentation I found a way to change the color for
> Gtk::VBox with a Gtk::EventBox, but
> I don't know how to color it just when the mouse goes over it.
>
> Any help, please?
>
>   

You'll probably have to connect a slot to the 
Gtk::Widget::signal_{enter,leave}_notify_event() signals (see 
Gtk::Widget docs).  See the book's signal chapter (
http://www.gtkmm.org/docs/gtkmm-2.4/docs/tutorial/html/sec-signals-overview.html) 
to understand signals and the section on popup menus 
(http://www.gtkmm.org/docs/gtkmm-2.4/docs/tutorial/html/sec-menus-popup.html) 
to see a sample handler definition that works with Gdk events.

> Here is the code:
>
> class PhotoTile : public Gtk::VBox
> {
> 	private:
> 		Gtk::VBox box_;
> 		Gtk::Image image_;
> 		Gtk::Label label_;
> 		Gtk::EventBox evtbox_;
>
> 		std::string imagename_;
>
> 	public:
>
> 		PhotoTile()
> 		{
> 			box_.set_spacing(12);
> 			box_.set_border_width(12);
> 			evtbox_.add(box_);
>
> 			
> 			evtbox_.modify_bg(Gtk::STATE_NORMAL, Gdk::Color("blue"));
> 		}
>
> 		void setImage(const std::string & imagepath)
> 		{
> 			image_.set(imagepath);
> 			box_.pack_start(image_, false, false);
> 			
> 			imagename_ = std::string(Glib::path_get_basename(imagepath), 0,
> 			Glib::path_get_basename(imagepath).find_last_of('.'));
> 			
> 			label_.set_text("<b>" + imagename_ + "</b>");
> 			label_.set_use_markup(true);
> 			
> 			box_.pack_start(label_, false, false);
>
> 			pack_start(evtbox_, false, false);
> 			show_all();
> 		}
> };
>
> And thanks for your time.
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>
>   


--
José Alburquerque
jaalburquerque cox net