Re: [gtkmm] suffering from slow treeview

[gtkmm-list <gtkmm hakvoort be>]

Thanks for the suggestion, it does speed thing up, but afais only when
you use a single color. I need alternating colors ( green,red,yellow) to
indicate the states of persons in list. And for that i need the line in 
Add() .

However, i found another solution for my problem today. i now use some
images from the Gtk::Stock collection icw render_icon() to indicate a
state. It's as clear as backgroundcolors and performance is MUCH better.

Still, i'm curious if there is a solution to this slow background
drawing. Any more ideas?

Bart




On Thu, 2004-04-01 at 18:37, Jeffrey S. Gavin wrote:
> move this line:
> 
>         
> color_column->add_attribute(cell_renderer_text->property_background(), 
> columns.color);
> 
> to the constructor, underneath the line:
> 
>     cell_renderer_text = 
> dynamic_cast<Gtk::CellRendererText*>(cell_renderer);
> 
> and your performance issue goes away (I have tested it already).
> 
> 
> You only need to set to set the cellrenderertext once (you set it for 
> the entire column), not for each row.
> 
> Jeff
> 
> gtkmm-list wrote:
> 
> >Hi listmembers,
> >
> >I lately stumbled upon this most annoying problem when i start using
> >colors in my treeview. The time to fill the Treestore is considerably
> >longer if you use colors and after performing some changes, it gets
> >worse. Has anyone experienced similar problems?
> >
> >Maybe it's a bad implemation from my side ( i hope so ) or is this a
> >common issue?
> >
> >Attached to this mail is a small demo i wrote to illustrate the problem.
> >Click the button "refresh" a couple of times ( 5 -15 depending on your
> >hardware ) and you'll notice the slowdown.
> >
> >btw, i use gtkmm 2.2.8
> >
> >thanks in advance,
> >
> >Bart
> >
> >  
> >
> >------------------------------------------------------------------------
> >
> >#include <gtkmm.h>
> >
> >
> >class DemoTree : public Gtk::TreeView
> >{
> >private:
> >	struct Columns : public Gtk::TreeModelColumnRecord             
> >	{
> >		Gtk::TreeModelColumn<std::string> column1;
> >		Gtk::TreeModelColumn<std::string> color;
> >		Columns() { add(column1);add(color); }
> >	};
> >	Columns columns;
> >	
> >	Gtk::CellRendererText* cell_renderer_text;
> >	Gtk::TreeViewColumn* color_column;
> >	Gtk::TreeRow row;
> >	
> >		
> >public:
> >	Glib::RefPtr<Gtk::TreeStore> treestore;
> >		
> >	DemoTree()
> >	{
> >		treestore = Gtk::TreeStore::create( columns );
> >		set_model( treestore );
> >						
> >		append_column("DemoColumn", columns.column1);
> >		
> >		color_column = get_column(0);
> >		Gtk::CellRenderer* cell_renderer = color_column->get_first_cell_renderer();
> >		cell_renderer_text = dynamic_cast<Gtk::CellRendererText*>(cell_renderer);
> >	}
> >	
> >	void AddRow( std::string name )
> >	{		
> >		row = *(treestore->append());
> >		row[columns.color] = "red";
> >		
> >		color_column->add_attribute(cell_renderer_text->property_background(), columns.color);
> >		
> >		row[columns.column1] = name;
> >	}
> >
> >
> >};
> >
> >class DemoWindow : public Gtk::Window
> >{
> >	DemoTree dt;
> >	Gtk::ScrolledWindow scroll_window;
> >	Gtk::VBox vbox_main;
> >	Gtk::Button btn_Refresh;
> >	
> >public:	
> >	DemoWindow()
> >	{
> >		set_default_size( 400, 600 );
> >		
> >		scroll_window.add( dt );
> >		scroll_window.set_policy(Gtk::POLICY_AUTOMATIC, Gtk::POLICY_AUTOMATIC);
> >		vbox_main.pack_start( scroll_window );
> >		
> >		btn_Refresh.set_label("Refresh");
> >		btn_Refresh.signal_clicked().connect( SigC::slot(*this, &DemoWindow::btn_refresh_click) );
> >		vbox_main.pack_start( btn_Refresh, Gtk::PACK_SHRINK );
> >		
> >		
> >		btn_refresh_click();//fill 'er up :P
> >			
> >		add(vbox_main);
> >		show_all_children();
> >	}
> >	
> >	void btn_refresh_click()
> >	{
> >		dt.treestore->clear();
> >		for(int i=0;i<200;i++) dt.AddRow( "TESTING");
> >	}
> >};
> >
> >
> >int main(int argc, char *argv[])
> >{
> >	Gtk::Main kit(argc, argv);
> >	    
> >	DemoWindow dw;
> >    Gtk::Main::run(dw);
> >}
> >  
> >
> 
> 
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