gtk2/demos/gtk-demo/sizegroup.c

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/* Size Groups
*
* GtkSizeGroup provides a mechanism for grouping a number of
* widgets together so they all request the same amount of space.
* This is typically useful when you want a column of widgets to
* have the same size, but you can't use a GtkTable widget.
*
* Note that size groups only affect the amount of space requested,
* not the size that the widgets finally receive. If you want the
* widgets in a GtkSizeGroup to actually be the same size, you need
* to pack them in such a way that they get the size they request
* and not more. For example, if you are packing your widgets
* into a table, you would not include the GTK_FILL flag.
*/
#include <glib/gi18n.h>
#include <gtk/gtk.h>
/* Convenience function to create a combo box holding a number of strings
*/
GtkWidget *
create_combo_box (const char **strings)
{
GtkWidget *combo_box;
const char **str;
combo_box = gtk_combo_box_text_new ();
for (str = strings; *str; str++)
gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (combo_box), *str);
gtk_combo_box_set_active (GTK_COMBO_BOX (combo_box), 0);
return combo_box;
}
static void
add_row (GtkGrid *table,
int row,
GtkSizeGroup *size_group,
const char *label_text,
const char **options)
{
GtkWidget *combo_box;
GtkWidget *label;
label = gtk_label_new_with_mnemonic (label_text);
gtk_widget_set_halign (label, GTK_ALIGN_START);
gtk_widget_set_valign (label, GTK_ALIGN_BASELINE);
gtk_widget_set_hexpand (label, TRUE);
gtk_grid_attach (table, label, 0, row, 1, 1);
combo_box = create_combo_box (options);
gtk_label_set_mnemonic_widget (GTK_LABEL (label), combo_box);
gtk_widget_set_halign (combo_box, GTK_ALIGN_END);
gtk_widget_set_valign (combo_box, GTK_ALIGN_BASELINE);
gtk_size_group_add_widget (size_group, combo_box);
gtk_grid_attach (table, combo_box, 1, row, 1, 1);
}
static void
toggle_grouping (GtkToggleButton *check_button,
GtkSizeGroup *size_group)
{
GtkSizeGroupMode new_mode;
/* GTK_SIZE_GROUP_NONE is not generally useful, but is useful
* here to show the effect of GTK_SIZE_GROUP_HORIZONTAL by
* contrast.
*/
if (gtk_toggle_button_get_active (check_button))
new_mode = GTK_SIZE_GROUP_HORIZONTAL;
else
new_mode = GTK_SIZE_GROUP_NONE;
gtk_size_group_set_mode (size_group, new_mode);
}
GtkWidget *
do_sizegroup (GtkWidget *do_widget)
{
static GtkWidget *window = NULL;
GtkWidget *table;
GtkWidget *frame;
GtkWidget *vbox;
GtkWidget *check_button;
GtkSizeGroup *size_group;
static const char *color_options[] = {
"Red", "Green", "Blue", NULL
};
static const char *dash_options[] = {
"Solid", "Dashed", "Dotted", NULL
};
static const char *end_options[] = {
"Square", "Round", "Double Arrow", NULL
};
if (!window)
{
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_display (GTK_WINDOW (window), gtk_widget_get_display (do_widget));
gtk_window_set_title (GTK_WINDOW (window), "Size Groups");
gtk_window_set_resizable (GTK_WINDOW (window), FALSE);
g_signal_connect (window, "destroy",
G_CALLBACK (gtk_widget_destroyed), &window);
vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 5);
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g_object_set (vbox, "margin", 5, NULL);
gtk_container_add (GTK_CONTAINER (window), vbox);
size_group = gtk_size_group_new (GTK_SIZE_GROUP_HORIZONTAL);
g_object_set_data_full (G_OBJECT (window), "size-group", size_group, g_object_unref);
/* Create one frame holding color options */
frame = gtk_frame_new ("Color Options");
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gtk_container_add (GTK_CONTAINER (vbox), frame);
table = gtk_grid_new ();
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g_object_set (table, "margin", 5, NULL);
gtk_grid_set_row_spacing (GTK_GRID (table), 5);
gtk_grid_set_column_spacing (GTK_GRID (table), 10);
gtk_container_add (GTK_CONTAINER (frame), table);
add_row (GTK_GRID (table), 0, size_group, "_Foreground", color_options);
add_row (GTK_GRID (table), 1, size_group, "_Background", color_options);
/* And another frame holding line style options */
frame = gtk_frame_new ("Line Options");
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gtk_container_add (GTK_CONTAINER (vbox), frame);
table = gtk_grid_new ();
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g_object_set (table, "margin", 5, NULL);
gtk_grid_set_row_spacing (GTK_GRID (table), 5);
gtk_grid_set_column_spacing (GTK_GRID (table), 10);
gtk_container_add (GTK_CONTAINER (frame), table);
add_row (GTK_GRID (table), 0, size_group, "_Dashing", dash_options);
add_row (GTK_GRID (table), 1, size_group, "_Line ends", end_options);
/* And a check button to turn grouping on and off */
check_button = gtk_check_button_new_with_mnemonic ("_Enable grouping");
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gtk_container_add (GTK_CONTAINER (vbox), check_button);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (check_button), TRUE);
g_signal_connect (check_button, "toggled",
G_CALLBACK (toggle_grouping), size_group);
}
if (!gtk_widget_get_visible (window))
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gtk_widget_show (window);
else
gtk_widget_destroy (window);
return window;
}