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GUI enabling/disabling of controls: Difference between revisions
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updateEnables; # Force initial state of buttons</lang>
=={{header|Vala}}==
{{libheader|Gtk+-3.0}}
<lang vala>bool validate_input(Gtk.Window window, string str){
int64 val;
bool ret = int64.try_parse(str,out val);;
if(!ret || str == ""){
var dialog = new Gtk.MessageDialog(window,
Gtk.DialogFlags.MODAL,
Gtk.MessageType.ERROR,
Gtk.ButtonsType.OK,
"Invalid value");
dialog.run();
dialog.destroy();
}
if(str == ""){
ret = false;
}
return ret;
}
int main (string[] args) {
Gtk.init (ref args);
var window = new Gtk.Window();
window.title = "Rosetta Code";
window.window_position = Gtk.WindowPosition.CENTER;
window.destroy.connect(Gtk.main_quit);
var box = new Gtk.Box(Gtk.Orientation.HORIZONTAL, 1);
box.set_border_width(1);
var label = new Gtk.Label("Value:");
var entry = new Gtk.Entry();
var ib = new Gtk.Button.with_label("inc");
var db = new Gtk.Button.with_label("dec");
ib.set_sensitive(true); //enable the inc button
db.set_sensitive(false); //disable the dec button
entry.set_text("0"); //initialize to zero
entry.activate.connect(() => {
var str = entry.get_text();
if(!validate_input(window, str)){
entry.set_text("0"); //initialize to zero on wrong input
}else{
int num = int.parse(str);
if(num != 0){
entry.set_sensitive(false); //disable the field
}
if(num > 0 && num < 10){
ib.set_sensitive(true); //enable the inc button
db.set_sensitive(true); //enable the dec button
}
if(num > 9){
ib.set_sensitive(false); //disable the inc button
db.set_sensitive(true); //enable the dec button
}
}
});
ib.clicked.connect(() => {
// read and validate the entered value
if(!validate_input(window, entry.get_text())){
entry.set_text("0"); //initialize to zero on wrong input
}else{
int num = int.parse(entry.get_text()) + 1;
entry.set_text(num.to_string());
if(num > 9){
ib.set_sensitive(false); //disable the inc button
}
if(num != 0){
db.set_sensitive(true); //enable the dec button
entry.set_sensitive(false); //disable the field
}
if(num == 0){
entry.set_sensitive(true); //enable the field
}
if(num < 0){
db.set_sensitive(false); //disable the dec button
}
}
});
db.clicked.connect(() => {
// read and validate the entered value
int num = int.parse(entry.get_text()) - 1;
entry.set_text(num.to_string());
if(num == 0){
db.set_sensitive(false); //disable the dec button
entry.set_sensitive(true); //enable the field
}
if(num < 10){
ib.set_sensitive(true); //enable the inc button
}
});
box.pack_start(label, false, false, 2);
box.pack_start(entry, false, false, 2);
box.pack_start(ib, false, false, 2);
box.pack_start(db, false, false, 2);
window.add(box);
window.show_all();
Gtk.main();
return 0;
}
</lang>
=={{header|Visual Basic}}==
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