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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.
*)
var
sg_window : PGtkWidget;
const
color_options : array [0..3] of pchar = ('Red', 'Green', 'Blue', NULL);
dash_options : array [0..3] of pchar = ('Solid', 'Dashed', 'Dotted', NULL);
end_options : array [0..3] of pchar = ('Square', 'Round', 'Arrow', NULL);
(* Convenience function to create an option menu holding a number of strings
*)
function create_option_menu (strings : ppchar): PGtkWidget;
var
menu,
menu_item,
option_menu : PGtkWidget;
str : ppchar;
begin
menu := gtk_menu_new ();
str := strings;
while str^ <> NULL do
begin
menu_item := gtk_menu_item_new_with_label ( str[0]);
gtk_widget_show (menu_item);
gtk_menu_shell_append (pGtkMenuShell(menu), menu_item);
inc(str);
end;
option_menu := gtk_option_menu_new ();
gtk_option_menu_set_menu (pGtkOptionMenu(option_menu), menu);
create_option_menu := option_menu;
end;
procedure add_row (table : PGtkTable;
row : integer;
size_group : PGtkSizeGroup;
label_text : pchar;
options : ppchar);
var
option_menu : PGtkWidget;
thelabel : PGtkWidget;
begin
thelabel := gtk_label_new_with_mnemonic (label_text);
gtk_misc_set_alignment (pGtkMisc(thelabel), 0, 1);
gtk_table_attach (pGtkTable(table), thelabel,
0, 1, row, row + 1,
GTK_EXPAND or GTK_FILL, 0,
0, 0);
option_menu := create_option_menu (options);
gtk_label_set_mnemonic_widget (pGtkLabel(thelabel), option_menu);
gtk_size_group_add_widget (size_group, option_menu);
gtk_table_attach (pGtkTable(table), option_menu,
1, 2, row, row + 1,
0, 0,
0, 0);
end;
procedure toggle_grouping (check_button : PGtkToggleButton;
size_group : PGtkSizeGroup); cdecl;
var
new_mode : TGtkSizeGroupMode;
begin
(* 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) then
new_mode := GTK_SIZE_GROUP_HORIZONTAL
else
new_mode := GTK_SIZE_GROUP_NONE;
gtk_size_group_set_mode (size_group, new_mode);
end;
function do_sizegroup : PGtkWidget;
var
table,
frame,
vbox,
check_button : PGtkWidget;
size_group : PGtkSizeGroup;
begin
if sg_window = NULL then
begin
sg_window := gtk_dialog_new_with_buttons ('Size Groups',
NULL, 0,
GTK_STOCK_CLOSE,
[ GTK_RESPONSE_NONE,
NULL]);
gtk_window_set_resizable (pGtkWindow(sg_window), FALSE);
g_signal_connect (sg_window, 'response',
TGCallback(@gtk_widget_destroy), NULL);
g_signal_connect (sg_window, 'destroy',
TGCallback(@gtk_widget_destroyed), @sg_window);
vbox := gtk_vbox_new (FALSE, 5);
gtk_box_pack_start (pGtkBox(pGtkDialog (sg_window)^.vbox), vbox, TRUE, TRUE, 0);
gtk_container_set_border_width (pGtkContainer(vbox), 5);
size_group := gtk_size_group_new (GTK_SIZE_GROUP_HORIZONTAL);
(* Create one frame holding color options
*)
frame := gtk_frame_new ('Color Options');
gtk_box_pack_start (pGtkBox(vbox), frame, TRUE, TRUE, 0);
table := gtk_table_new (2, 2, FALSE);
gtk_container_set_border_width (pGtkContainer(table), 5);
gtk_table_set_row_spacings (pGtkTable(table), 5);
gtk_table_set_col_spacings (pGtkTable(table), 10);
gtk_container_add (pGtkContainer(frame), table);
add_row (pGtkTable(table), 0, size_group, '_Foreground', @color_options[0]);
add_row (pGtkTable(table), 1, size_group, '_Background', @color_options[0]);
(* And another frame holding line style options
*)
frame := gtk_frame_new ('Line Options');
gtk_box_pack_start (pGtkBox(vbox), frame, FALSE, FALSE, 0);
table := gtk_table_new (2, 2, FALSE);
gtk_container_set_border_width (pGtkContainer(table), 5);
gtk_table_set_row_spacings (pGtkTable(table), 5);
gtk_table_set_col_spacings (pGtkTable(table), 10);
gtk_container_add (pGtkContainer(frame), table);
add_row (pGtkTable(table), 0, size_group, '_Dashing', @dash_options[0]);
add_row (pGtkTable(table), 1, size_group, '_Line ends', @end_options[0]);
(* And a check button to turn grouping on and off *)
check_button := gtk_check_button_new_with_mnemonic ('_Enable grouping');
gtk_box_pack_start (pGtkBox(vbox), check_button, FALSE, FALSE, 0);
gtk_toggle_button_set_active (pGtkToggleButton(check_button), TRUE);
g_signal_connect (check_button, 'toggled',
TGCallback (@toggle_grouping), size_group);
end;
if not GTK_WIDGET_VISIBLE (sg_window) then
gtk_widget_show_all (sg_window)
else begin
gtk_widget_destroy (sg_window);
sg_window := NULL;
end;
do_sizegroup := sg_window;
end;
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