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Peter · GTK+ Geek Joined: 10 May 2008 Posts: 54

Please help.

I am setting up a Treeview (see code) and in the SETUP section
I am adding vertical scroller. I doing obviously something wrong
because the scroller never shows up, even if the list is very long in the
treeview.
Please, anyone can help?
Peter

Code: (C)

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void SignalTree(GtkWidget *window, int r) {
static GtkListStore *store;
static GtkTreeIter iter;
static GtkWidget *treeview, *scrolled_win;
static GtkCellRenderer *renderer;
static GtkTreeViewColumn *column;
static GtkTreeSelection *selection;
static GtkTreeModel *model;
int i, j, R, Ndata, click = 0, n;
gchar edtext[80];

treeview = lookup_widget (window, "Signaltree");
model = gtk_tree_view_get_model (GTK_TREE_VIEW (treeview));
Ndata = sizeof(SigNames)/sizeof(SigNames[0]);

if (r==STARTUP) {
NumSignals = 0;
NumSelSignals = 0;

store = gtk_list_store_new (N_COLUMNS, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING);

renderer = gtk_cell_renderer_text_new ();
column = gtk_tree_view_column_new_with_attributes ("Signal", renderer, "text", SIGNAME_COLUMN, NULL);
gtk_tree_view_column_set_resizable (column, TRUE);

gtk_tree_view_append_column (GTK_TREE_VIEW (treeview), column);
// gtk_tree_view_column_set_expand (GtkTreeViewColumn, column, TRUE);

renderer = gtk_cell_renderer_text_new ();
column = gtk_tree_view_column_new_with_attributes ("Selected", renderer, "text", SIGUNIT_COLUMN, NULL);
gtk_tree_view_column_set_resizable (column, TRUE);

gtk_tree_view_append_column (GTK_TREE_VIEW (treeview), column);

selection = gtk_tree_view_get_selection(GTK_TREE_VIEW(treeview));
//gtk_tree_selection_set_mode(selection, GTK_SELECTION_SINGLE);
gtk_tree_selection_set_mode ( selection, GTK_SELECTION_MULTIPLE );

// insert content
for (j = 0; j < 5; j++) {
for (i = 0; i < Ndata; i++) {
NumSignals++;
/* Add a new row to the model */
gtk_list_store_append (store, &iter);
gtk_list_store_set (store, &iter, SIGNAME_COLUMN, SigNames[i], -1);
gtk_list_store_set (store, &iter, SIGUNIT_COLUMN, UnitNames[i], -1);

} // i
} // j

// the scroller:
scrolled_win = gtk_scrolled_window_new(GTK_TREE_VIEW(treeview), GTK_TREE_MODEL(store));
gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(scrolled_win), GTK_POLICY_ALWAYS, GTK_POLICY_ALWAYS);
gtk_container_add(GTK_CONTAINER(scrolled_win), treeview);
gtk_container_add(GTK_CONTAINER(window), scrolled_win);

} else if (r==REFRESH ){ // generate in random order
gtk_list_store_clear (store);
//....do something else
} else if (r==APPEND) {
n = 0;
gtk_list_store_clear (store);
} else if (r==CLEAR) {
gtk_list_store_clear (store);
NumSelSignals = 0;
}
gtk_tree_view_set_model(GTK_TREE_VIEW(treeview), GTK_TREE_MODEL(store));
gtk_widget_show_all(treeview);
}

Micah Carrick · Posted: Tue May 13, 2008 4:10 pm Post subject:

Change this line:

Code: (C)
1	scrolled_win = gtk_scrolled_window_new(GTK_TREE_VIEW(treeview), GTK_TREE_MODEL(store));

to this;

Code: (C)
1	scrolled_win = gtk_scrolled_window_new(NULL, NULL);

Essentially, when adding a GtkTreeView widget to a GtkScrolledWindow you don't need to worry about the GtkAdjustments, it happens automatically through magic. Or, more precisely, from the manual...

Quote:

The scrolled window can work in two ways. Some widgets have native scrolling support; these widgets have "slots" for GtkAdjustment objects. [5] Widgets with native scroll support include GtkTreeView, GtkTextView, and GtkLayout.

and...

Quote:

The two arguments are the scrolled window's adjustments; these will be shared with the scrollbars and the child widget to keep the bars in sync with the child. Usually you want to pass NULL for the adjustments, which will cause the scrolled window to create them for you.

Peter · GTK+ Geek Joined: 10 May 2008 Posts: 54

Micah Carrick · Posted: Tue May 13, 2008 5:44 pm Post subject:

Oh... I wasn't looking that closely. You are using Glade right?

You need to put the treeview widget into a scrolled window from within Glade.

Peter · GTK+ Geek Joined: 10 May 2008 Posts: 54

Micah Carrick · Posted: Tue May 13, 2008 7:50 pm Post subject:

Yes, the GtkTreeView has "slots" for scrollers automatically. When you add a GtkTreeView (or GtkTextView) to a GtkScrolledWindow--be it through Glade or through code--the scrolling functionality will be handled automatically from that point.