Re: Displaying simple rows/columns of text (using TreeView now, used CList in version 1)

["Marco Scholten" <mscholtn xs4all nl>]

> From: "Toralf Lund" <toralf procaptura com>
> To: "GTK-- Mailing List" <gtkmm-list gnome org>
> Subject: Displaying simple rows/columns of text (using TreeView now, used
> CList in version 1)
> Date: Thu, 24 Feb 2005 13:24:10 +0100
>
> Just trying to display some simple text organised in rows and columns
> for the first time with gtkmm 2... With version 1, I would use CList for
> this purpose, but that type is gone, so what is the simplest way of
> doing this in the current version?
>
> Actually, I've successfully set up what I want via Gtk::TreeView and
> friends, but I can't help feeling that it all got way too complex. I
> mean, this approach requires at least 10 lines of code to replace the
> simple "new Gtk::CList(...)", and assignment to existing values is extra
> work, too. Differently put, it seems like I pay a too high price for
> flexibility that I don't need. So is there an alternative? Or perhaps
> I've missed some shortcuts available when setting up a TreeView? One
> thing I didn't quite understand when doing that, by the way, was why I
> had to set up the columns via the "store" object *and* methods to the
> view itself.

I agree that a treeview is to complex if you just want a simple list.
To make this a little simpler i made this class:

class TextList: public Gtk::TreeView
{
	public:
		TextList(int nr_of_columns = 1);
		~TextList(){;}
		virtual void add_row(Glib::ustring s, int row = -1);
		virtual bool set_text(unsigned int row,Glib::ustring s); //separate  
column values by \t	to set complete row at once
		virtual bool set_text(unsigned int row, unsigned int col ,Glib::ustring  
s);		
		virtual Glib::ustring get_text(unsigned int row); //returns complete row  
column values separated by \t
		virtual Glib::ustring get_text(unsigned int row, unsigned int col);
		virtual bool remove_row(int row);
		virtual void clear();
		virtual unsigned int get_n_rows() const;
		virtual unsigned int get_n_columns() const;
		virtual int get_active_row();
		virtual void set_active_row(unsigned int row);
		virtual sigc::signal<void> signal_selection_changed();
	protected:
		void CreateColumns(int nr_of_columns);
		sigc::signal<void> selection_changed;
		void on_selection_changed();
	private:
		TextList(const TextList&);
		TextList& operator=(const TextList&);
		vector<Gtk::TreeModelColumn<Glib::ustring> > m_Columns;
		Gtk::TreeModel::ColumnRecord m_ModelColumns;
		Glib::RefPtr<Gtk::ListStore> m_refTreeModel;
};

And when i need some extra data associated with each row i use:

template <class T>
class TextListWithRowData: public TextList
{
  public:
	TextListWithRowData(int nr_of_columns = 1);
	~TextListWithRowData();
	virtual void add_row(T rowdata, Glib::ustring s, int row = -1);
	virtual bool remove_row(int row);
	virtual void clear();
	virtual T get_row_data(const unsigned int row);
	virtual void set_row_data(const unsigned int row, const T data);
  private:
  	vector<T> m_RowData;
};


using this is as easy as:

tl = TextList(3);
tl->add_row("row 0 col 0\trow 0 col 1\trow 0 col 2");
tl->add_row("row 1 col 0\trow 1 col 1\trow 1 col 2");
tl->add_row("row 2 col 0\trow 2 col 1\trow 2 col 2");

I think it would be nice if gtkmm had something like this, kinda like the  
how ComboBoxText makes the ComboBox a little simpler.


--
Marco