Re: Question about TreeView particularly GtkCellRendererCombo

["Tadej Borovšak" <tadeboro gmail com>]

Hi.

I'm afraid that the ideal solution cannot be achieved since you would
need 2 different renderers on the same place. The second proposed
solution can be achieved and it's quite simple to code.

And since the example can say more than a thousand words, I wrote a
simple application to demonstrate some techniques I use (they may not
be the best, but they work).

---------------
#include <gtk/gtk.h>

enum
{
    TYPE_COL,
    TEXT_COL,
    TEXT_SENS_COL,
    INT_COL,
    INT_SENS_COL,
    NO_COLS
};


static void
cb_type_changed( GtkCellRendererText *renderer,
                 gchar               *path,
                 gchar               *new_text,
                 GtkListStore        *master )
{
    GtkTreeIter   iter;
    gchar        *old_text;
    gboolean      text_sens = FALSE;
    gboolean      int_sens = FALSE;

    /* Get previous value from master model */
    gtk_tree_model_get_iter_from_string( GTK_TREE_MODEL( master ),
                                         &iter, path );
    gtk_tree_model_get( GTK_TREE_MODEL( master ), &iter,
                        TYPE_COL, &old_text, -1 );

    /* Do we need to change anything? */
    if( ! g_strcmp0( old_text, new_text ) )
        return;

    /* What changes are needed? */
    if( ! g_strcmp0( new_text, "String" ) )
        text_sens = TRUE;
    else if( ! g_strcmp0( new_text, "Integer" ) )
        int_sens = TRUE;

    /* Update master model */
    gtk_list_store_set( master, &iter, TYPE_COL, new_text,
                                       TEXT_SENS_COL, text_sens,
                                       INT_SENS_COL, int_sens,
                                       -1 );
}


static void
cb_string_param_changed( GtkCellRendererText *renderer,
                         gchar               *path,
                         gchar               *new_text,
                         GtkListStore        *master )
{
    GtkTreeIter   iter;

    /* Update master model */
    gtk_tree_model_get_iter_from_string( GTK_TREE_MODEL( master ),
                                         &iter, path );
    gtk_list_store_set( master, &iter, TEXT_COL, new_text, -1 );
}

static void
cb_integer_param_changed( GtkCellRendererText *renderer,
                          gchar               *path,
                          gchar               *new_text,
                          GtkListStore        *master )
{
    GtkTreeIter   iter;
    gint          value;

    /* Update master model */
    gtk_tree_model_get_iter_from_string( GTK_TREE_MODEL( master ),
                                         &iter, path );
    value = (gint)strtol( new_text, NULL, 10 );
    gtk_list_store_set( master, &iter, INT_COL, value, -1 );
}

int
main( int    argc,
      char **argv )
{
    GtkWidget         *window;
    GtkWidget         *treeview;
    GtkListStore      *model;
    GtkListStore      *master;
    GtkTreeIter        iter;
    GtkCellRenderer   *renderer;
    GtkAdjustment     *adj;
    GtkTreeViewColumn *col;

    gtk_init( &argc, &argv );

    window = gtk_window_new( GTK_WINDOW_TOPLEVEL );
    g_signal_connect( G_OBJECT( window ), "destroy",
                      G_CALLBACK( gtk_main_quit ), NULL );


    /* create treeview */
    treeview = gtk_tree_view_new();
    gtk_tree_view_set_reorderable( GTK_TREE_VIEW( treeview ), TRUE );
    gtk_container_add( GTK_CONTAINER( window ), treeview );

    /* Create "master" model for treeview and add 2 entries */
    master = gtk_list_store_new( NO_COLS, G_TYPE_STRING,
                                          G_TYPE_STRING,
                                          G_TYPE_BOOLEAN,
                                          G_TYPE_INT,
                                          G_TYPE_BOOLEAN );
    gtk_list_store_append( master, &iter );
    gtk_list_store_set( master, &iter, TYPE_COL, "None",
                                       TEXT_COL, "Parameter 1",
                                       TEXT_SENS_COL, FALSE,
                                       INT_COL, 0,
                                       INT_SENS_COL, FALSE,
                                       -1 );
    gtk_list_store_append( master, &iter );
    gtk_list_store_set( master, &iter, TYPE_COL, "Integer",
                                       TEXT_COL, "Parameter 1",
                                       TEXT_SENS_COL, FALSE,
                                       INT_COL, 5,
                                       INT_SENS_COL, TRUE,
                                       -1 );
    gtk_tree_view_set_model( GTK_TREE_VIEW( treeview ),
                             GTK_TREE_MODEL( master ) );

    /* column 1 */
    /* Create model for combo renderer and populate it */
    model = gtk_list_store_new( 2, G_TYPE_STRING, G_TYPE_INT );
    gtk_list_store_append( model, &iter );
    gtk_list_store_set( model, &iter, 0, "None", 1, 0, -1 );
    gtk_list_store_append( model, &iter );
    gtk_list_store_set( model, &iter, 0, "String", 1, 1, -1 );
    gtk_list_store_append( model, &iter );
    gtk_list_store_set( model, &iter, 0, "Integer", 1, 2, -1 );

    /* Create column and add renderer to it */
    col = gtk_tree_view_column_new();
    gtk_tree_view_column_set_resizable( col, TRUE );

    renderer = gtk_cell_renderer_combo_new();
    g_signal_connect( G_OBJECT( renderer ), "edited",
                      G_CALLBACK( cb_type_changed ), master );
    g_object_set( G_OBJECT( renderer ), "model", GTK_TREE_MODEL( model ),
                                        "text-column", 0,
                                        "editable", TRUE,
                                        "has_entry", FALSE,
                                        NULL );
    gtk_tree_view_column_pack_start( col, renderer, TRUE );
    gtk_tree_view_column_set_attributes( col, renderer, "text", TYPE_COL,
                                         NULL );
    gtk_tree_view_append_column( GTK_TREE_VIEW( treeview ), col );

    /* column 2 */
    /* Again create model for combo renderer and populate it */
    model = gtk_list_store_new( 1, G_TYPE_STRING );
    gtk_list_store_append( model, &iter );
    gtk_list_store_set( model, &iter, 0, "Parameter 1", -1 );
    gtk_list_store_append( model, &iter );
    gtk_list_store_set( model, &iter, 0, "Parameter 2", -1 );
    gtk_list_store_append( model, &iter );
    gtk_list_store_set( model, &iter, 0, "Parameter 3", -1 );

    /* Create column and add renderer to it */
    col = gtk_tree_view_column_new();
    gtk_tree_view_column_set_resizable( col, TRUE );

    renderer = gtk_cell_renderer_combo_new();
    g_signal_connect( G_OBJECT( renderer ), "edited",
                      G_CALLBACK( cb_string_param_changed ), master );
    g_object_set( G_OBJECT( renderer ), "model", GTK_TREE_MODEL( model ),
                                        "text-column", 0,
                                        "has_entry", FALSE,
                                        NULL );
    gtk_tree_view_column_pack_start( col, renderer, TRUE );
    gtk_tree_view_column_set_attributes( col, renderer,
                                         "text", TEXT_COL,
                                         "sensitive", TEXT_SENS_COL,
                                         "editable", TEXT_SENS_COL,
                                         NULL );
    gtk_tree_view_append_column( GTK_TREE_VIEW( treeview ), col );

    /* column 3 */
    /* Create adjustment for spin renderer */
    adj = GTK_ADJUSTMENT( gtk_adjustment_new( 0, 0, 100, 1, 10, 0 ) );

    /* Create column and add renderer to it */
    col = gtk_tree_view_column_new();
    gtk_tree_view_column_set_resizable( col, TRUE );

    renderer = gtk_cell_renderer_spin_new();
    g_signal_connect( G_OBJECT( renderer ), "edited",
                      G_CALLBACK( cb_integer_param_changed ), master );
    g_object_set( G_OBJECT( renderer ), "adjustment", adj,
                                        "editable", TRUE,
                                        NULL );
    gtk_tree_view_column_pack_start( col, renderer, TRUE );
    gtk_tree_view_column_set_attributes( col, renderer,
                                         "text", INT_COL,
                                         "sensitive", INT_SENS_COL,
                                         "editable", INT_SENS_COL,
                                         NULL );
    gtk_tree_view_append_column( GTK_TREE_VIEW( treeview ), col );


    gtk_widget_show_all( window );

    gtk_main();

    return( 0);
}
------------------

Hope you'll find it useful.



2008/12/10 John M Collins <jmc xisl com>:
> In my application I am trying to build a dialog box to display and allow
> the user to create/delete/edit a list of some structures.
>
> According to the "type" field in the structures, some variants of the
> structures use a string as a parameter, others use an integer. (There is
> a "null" option which doesn't take anything).
>
> Ideally I'd like to have a TreeView with 2 columns (there are some other
> ones too relating to other fields in the structure but we'll ignore them
> for the purposes of the question), with a GtkCellRenderCombo for the
> "type" and the second column either an editable text field or a spin box
> depending on what was selected in the ComboBox. Obviously it would be
> different for each row depending on what "type" was selected for the
> structure represented by that row.
>
> If that can't be done simply - and it probably isn't worth having huge
> lumps of code to do just one bit of one dialog the way I want it in one
> part of one application - is it possible to selectively make a given
> cell non-sensitive or invisible according to the selected value of the
> combo box without affecting different rows in the same column? And how
> do I reach the "changed" signal for the ComboBox?
>
> Another more trivial question relates to the initial size of the
> TreeView (I am using a scroll as well) which is fine if I have existing
> structures to display when I start, but if the list is empty to start
> with I get a pathetic weedy little window I can only see half a line in.
> Is there a nice clean way I can set a minimum size - preferably not
> mentioning pixels for the benefit of people using big default fonts?
>
>
> John Collins Xi Software Ltd www.xisl.com
>
> _______________________________________________
> gtk-app-devel-list mailing list
> gtk-app-devel-list gnome org
> http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
>



-- 
Tadej Borovšak
00386 (0)40 613 131
tadeboro gmail com
tadej borovsak gmail com