}//class
public bool?ReadYesNoCancel(string prompt, bool?defaultYes,
bool cancelButton)
{
bool? result = defaultYes;
var w = new ManualResetEvent(false);
Action exit = () => w.Set();
IDialogInterfaceOnCancelListener lsnrCancel = new IDIOCancelListener {
Action = () => {
System.Diagnostics.Debug.Assert(result == defaultYes, "NOT equal '" + result + " and '" + defaultYes + "'");
exit();
},
};
EventHandler dlgt = delegate {
var bldr = new AlertDialog.Builder(_parent);
bldr.SetMessage(prompt);
bldr.SetCancelable(true);
bldr.SetOnCancelListener(lsnrCancel);
bldr.SetPositiveButton("Yes", delegate {
result = true;
exit();
});
bldr.SetNeutralButton("No", delegate {
result = false;
exit();
});
if (cancelButton)
{
bldr.SetNegativeButton("Cancel", delegate {
result = null;
exit();
});
}
var dlg = bldr.Create();
dlg.Show();
};
UiInvokeNoWait(dlgt);
w.WaitOne();
return(result);
}
//----
public override string SafeReadLine(string prompt, string title)
{
string result = null;
var w = new ManualResetEvent(false);
Action exit = () => w.Set();
IDialogInterfaceOnCancelListener lsnrCancel = new IDIOCancelListener {
Action = () => {
System.Diagnostics.Debug.Assert(result == null, "NOT null '" + result + "'");
exit();
},
};
EventHandler dlgt = delegate {
var bldr = new AlertDialog.Builder(_parent);
bldr.SetTitle(title);
bldr.SetMessage(prompt);
// Set an EditText view to get user input final
EditText input = new EditText(_parent);
bldr.SetView(input);
bldr.SetCancelable(true);
bldr.SetOnCancelListener(lsnrCancel);
bldr.SetPositiveButton("Yes", delegate {
result = input.Text;
exit();
});
bldr.SetNeutralButton("No", delegate {
result = null;
exit();
});
var dlg = bldr.Create();
dlg.Show();
};
UiInvokeNoWait(dlgt);
w.WaitOne();
return(result);
}
