Re: Trying hard with a custom cellrenderer.

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

There is only template specialization for "standart" types of
TreeModelColumn, such as <int>, <ustring>, <void*>, etc.

To use <URL*> template you must specialize it yourself using Gtk
namespace. And implement all functions to get/set value from/into cell,
I guess.

I suggest, you to use <void*> template and override
render/get_size-_vfunc() where get value from property with:

void* ptr = property_url();
URL* url = reimplement_cast< URL* >( ptr );

Either use TreeViewColumn::set_cell_data_func().

Regards,

В Чтв, 01/07/2010 в 13:34 +0200, Germán Diago пишет:
> Partially solved:
> 
> #include <gtkmm.h>
> #include <string>
> #include <iostream>
> 
> 
> using namespace Gtk;
> 
> 
> class URL {
>     std::string url_;
> public:
>     explicit URL(const std::string & url) : url_(url) {}
>     const std::string & getAsString() const { return url_; }
> };
> 
> 
> class URLCellRenderer : public Gtk::CellRendererPixbuf {
> private:
>     // the property whose value will be set by Gtk before a cell is rendered
>     Glib::Property<Glib::ustring> property_url_;
>     OffscreenWindow osw_;
>     Gtk::Button button_;
>     Gtk::Image img_;
> 
> public:
>     URLCellRenderer() :  Glib::ObjectBase(typeid(URLCellRenderer)),
>             Gtk::CellRendererPixbuf(),  property_url_ (*this, "url"),
>             img_(Gtk::Stock::MEDIA_PLAY, Gtk::ICON_SIZE_BUTTON)
>     {
>         button_.set_image(img_);
> 
>         osw_.add(button_);
>         osw_.show_all();
>         property_pixbuf() = osw_.get_pixbuf();
>     }
> 
>     void     get_size_vfunc  	(Widget&   	 widget,
> 		const Gdk::Rectangle*  	cell_area,
> 		int *  	x_offset,
> 		int *  	y_offset,
> 		int *  	width,
> 		int *  	height	
> 	) const
>     {
>         *width = property_pixbuf().get_value()->get_width();
>         *height = property_pixbuf().get_value()->get_height();
> 	}
> 	
> 
>     void render_vfunc(Glib::RefPtr<Gdk::Drawable> const & window,
>                       Gtk::Widget& widget,
>                       Gdk::Rectangle const & background_area,
>                       Gdk::Rectangle const & cell_area,
>                       Gdk::Rectangle const & expose_area,
>                       Gtk::CellRendererState flags)  {
>         property_pixbuf() = osw_.get_pixbuf();
>         CellRendererPixbuf::render_vfunc(window, widget,
> background_area, cell_area, expose_area, flags);
>     }
> };
> 
> 
> class Cols : public Gtk::TreeModelColumnRecord {
> public:
>     Cols() { add(name); add(url); }
> 
>     TreeModelColumn<Glib::ustring> name;
>     TreeModelColumn<Glib::ustring> url;
> };
> 
> 
> int main (int argc, char* argv[])
> {
>     Gtk::Main m(&argc, &argv);
>     Cols c;
>     URL location("http://www.uji.es";);
> 
>     auto store = ListStore::create(c);
>     TreeView view(store);
>     CellRendererText cellr;
>     URLCellRenderer cellr2;
> 
>     TreeViewColumn tvcol("Name");
>     TreeViewColumn tvcol2("Location");
> 
>     view.append_column(tvcol);
>     view.append_column(tvcol2);
> 
>     tvcol.pack_start(cellr);
>     tvcol.add_attribute(cellr, "text", c.name);
> 
>     tvcol2.pack_start(cellr2, false);
>     //tvcol2.add_attribute(cellr2, "url", c.url);
> 
>     view.set_headers_visible(true);
>     Gtk::Window window;
>     window.add(view);
> 
> 
>     auto iter = store->append();
>     iter->set_value(c.name, Glib::ustring("Germán"));
>     iter->set_value(c.url, Glib::ustring(location.getAsString()));
> 
>     window.show_all();
>     Main::run(window);
>     return 0;
> }
> 
> 
> If someone could tell me how to use a Gtk::TreeModelColumn<URL *>
> instead of Glib::ustring I would be happy. This works, but
> it's not exactly what I had in my head. Thanks.
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-- 
Andrew E. Makeev <andrew solvo ru>
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