ruby-****@sourc*****
ruby-****@sourc*****
2009年 2月 18日 (水) 13:45:36 JST
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REMOTE_ADDR = 74.15.84.244
REMOTE_HOST =
URL = http://ruby-gnome2.sourceforge.jp/hiki.cgi?tut-gtk2-treev-treev-spin-cgtk-01
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TITLE = tut-gtk2-treev-treev-spin-cgtk-01
KEYWORD =
= The Tree View Widget
{{link nil, "tut-gtk2-treev-spin", nil, nil}}
== Problem With Spin Button Renderers
== C GTK+ version of "Spin Button Renderers" example program
{{image_right("dialog-warning.png")}}
Unfortunately neither GtkCellRendererSpin nor Gtk::CellRendererSpin classes currently (as of Ruby 1.8.6 and Ruby-GNOME2 rel.: 2-0.17.0-rc1) do not work as expected. Following is the C incarnation of this example. You can compile and run it to see for yourself, that the problem is not in GTK+ but rather in ...
You can compile this program with the following command:
gcc -Wall iterators.c -o iterators \
`pkg-config --cflags gtk+-2.0` \
`pkg-config --libs gtk+-2.0`
Note the backticks surrounding the last two parameters which are the commands supplying flags, include options, and required libraries to gcc. Indeed you should have all this GTK+ stuff installed in order for gcc to compile this program.
{{image_left("treev-trees-ok.png")}}
{{image_right("dialog-warning.png")}}
This program like our Ruby example does not display Spin Buttons! It also spits out very similar warning / error messages as our Ruby example.
{{br}}
Following is the ((*pixbuf-spin.c*)) program in C that also does not work:
#include <gtk/gtk.h>
enum
{
BUY_IT = 0,
QUANTITY,
PRODUCT,
COLUMNS
};
enum
{
PRODUCT_CATEGORY,
PRODUCT_CHILD
};
typedef struct
{
gint product_type;
gboolean buy;
gint quantity;
gchar *product;
} GroceryItem;
GroceryItem list[] =
{
{ PRODUCT_CATEGORY, TRUE, 0, "Cleaning Supplies" },
{ PRODUCT_CHILD, TRUE, 1, "Paper Towels" },
{ PRODUCT_CHILD, TRUE, 3, "Toilet Paper" },
{ PRODUCT_CATEGORY, TRUE, 0, "Food" },
{ PRODUCT_CHILD, TRUE, 2, "Bread" },
{ PRODUCT_CHILD, FALSE, 1, "Butter" },
{ PRODUCT_CHILD, TRUE, 1, "Milk" },
{ PRODUCT_CHILD, FALSE, 3, "Chips" },
{ PRODUCT_CHILD, TRUE, 4, "Soda" },
{ PRODUCT_CATEGORY, FALSE, 0, NULL }
};
static void setup_tree_view (GtkWidget*);
static void cell_edited (GtkCellRendererSpin*, gchar*, gchar*, GtkTreeView*);
int main (int argc,
char *argv[])
{
GtkWidget *window, *treeview, *scrolled_win;
GtkTreeStore *store;
GtkTreeIter iter, child;
guint i = 0, j;
gtk_init (&argc, &argv);
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_title (GTK_WINDOW (window), "Grocery List");
gtk_container_set_border_width (GTK_CONTAINER (window), 10);
gtk_widget_set_size_request (window, 275, 300);
g_signal_connect (G_OBJECT (window), "destroy",
G_CALLBACK (gtk_main_quit), NULL);
treeview = gtk_tree_view_new ();
setup_tree_view (treeview);
store = gtk_tree_store_new (COLUMNS, G_TYPE_BOOLEAN, G_TYPE_INT, G_TYPE_STRING);
while (list[i].product != NULL)
{
/* If the product type is a category, count the quantity of all of the products
* in the category that are going to be boughty. */
if (list[i].product_type == PRODUCT_CATEGORY)
{
j = i + 1;
/* Calculate how many products will be bought in the category. */
while (list[j].product != NULL && list[j].product_type != PRODUCT_CATEGORY)
{
if (list[j].buy)
list[i].quantity += list[j].quantity;
j++;
}
/* Add the category as a new root element. */
gtk_tree_store_append (store, &iter, NULL);
gtk_tree_store_set (store, &iter, BUY_IT, list[i].buy,
QUANTITY, list[i].quantity, PRODUCT, list[i].product, -1);
}
/* Otherwise, add the product as a child of the category. */
else
{
gtk_tree_store_append (store, &child, &iter);
gtk_tree_store_set (store, &child, BUY_IT, list[i].buy,
QUANTITY, list[i].quantity, PRODUCT, list[i].product, -1);
}
i++;
}
gtk_tree_view_set_model (GTK_TREE_VIEW (treeview), GTK_TREE_MODEL (store));
gtk_tree_view_expand_all (GTK_TREE_VIEW (treeview));
g_object_unref (store);
scrolled_win = gtk_scrolled_window_new (NULL, NULL);
gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrolled_win),
GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
gtk_container_add (GTK_CONTAINER (scrolled_win), treeview);
gtk_container_add (GTK_CONTAINER (window), scrolled_win);
gtk_widget_show_all (window);
gtk_main ();
return 0;
}
/* Add three columns to the GtkTreeView. All three of the columns will be
* displayed as text, although one is a gboolean value and another is
* an integer. */
static void
setup_tree_view (GtkWidget *treeview)
{
GtkCellRenderer *renderer;
GtkTreeViewColumn *column;
GtkAdjustment *adj;
renderer = gtk_cell_renderer_text_new ();
column = gtk_tree_view_column_new_with_attributes
("Buy", renderer, "text", BUY_IT, NULL);
gtk_tree_view_append_column (GTK_TREE_VIEW (treeview), column);
adj = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 100.0, 1.0, 2.0, 2.0));
renderer = gtk_cell_renderer_spin_new ();
g_signal_connect (G_OBJECT (renderer), "edited",
G_CALLBACK (cell_edited),
(gpointer) treeview);
column = gtk_tree_view_column_new_with_attributes
("Count", renderer, "text", QUANTITY, NULL);
gtk_tree_view_append_column (GTK_TREE_VIEW (treeview), column);
/* Create a a tree view column with two renderers, one a pixbuf
and one text. */
column = gtk_tree_view_column_new ();
gtk_tree_view_column_set_title (column, "Products");
renderer = gtk_cell_renderer_pixbuf_new ();
gtk_tree_view_column_pack_start (column, renderer, FALSE);
gtk_tree_view_column_set_attributes(column, renderer, "pixbuf", GTK_STOCK_DIALOG_QUESTION, NULL);
renderer = gtk_cell_renderer_text_new ();
gtk_tree_view_column_pack_start (column, renderer, TRUE);
gtk_tree_view_column_set_attributes(column, renderer, "text", PRODUCT, NULL);
gtk_tree_view_append_column (GTK_TREE_VIEW (treeview), column);
}
/* Apply the changed text to the cell */
cell_edited (GtkCellRendererSpin *renderer,
gchar *path,
gchar *new_text,
GtkTreeView *treeview)
{
GtkTreeIter iter;
GtkTreeModel *model;
GtkAdjustment *adjustment;
gdouble value;
/* Retrieve the current value stored by the spin button renderer's adjustment. */
g_object_get (renderer, "adjustment", &adjustment, NULL);
value = gtk_adjustment_get_value (adjustment);
model = gtk_tree_view_get_model (treeview);
if (gtk_tree_model_get_iter_from_string (model, &iter, path))
gtk_list_store_set (GTK_LIST_STORE (model), &iter, QUANTITY, value, -1);
}