private static void OnTextBoxTextChanged(Object sender, TextChangedEventArgs args)
{
TextBox source = (TextBox)sender;
String value = source.Text;
if (String.IsNullOrWhiteSpace(value) || !NumberTextBoxHelper.IsValid(source, value))
{
source.Text = NumberTextBoxHelper.GetDefault(source)?.ToString();
}
}
private static void OnTextBoxPreviewTextInput(Object sender, TextCompositionEventArgs args)
{
String value;
TextBox source = (TextBox)sender;
if (source.SelectionLength == 0)
{
value = source.Text
.Insert(source.SelectionStart, args.Text);
}
else
{
value = source.Text
.Remove(source.SelectionStart, source.SelectionLength)
.Insert(source.SelectionStart, args.Text);
}
args.Handled = !NumberTextBoxHelper.IsValid(source, value);
}
private static Boolean IsValid(TextBox source, String value)
{
if (value == null)
{
return(false);
}
Int32?minimum = NumberTextBoxHelper.GetMinimum(source);
Int32?maximum = NumberTextBoxHelper.GetMaximum(source);
if (value.Length == 1 && value[0] == '-')
{
if (minimum.HasValue && minimum.Value >= 1)
{
return(false);
}
return(true);
}
if (!Int32.TryParse(value, out Int32 number))
{
return(false);
}
if (minimum.HasValue && number < minimum.Value)
{
return(false);
}
if (maximum.HasValue && number > maximum.Value)
{
return(false);
}
return(true);
}
private static void OnTextBoxPasteEventHandler(Object sender, DataObjectPastingEventArgs args)
{
String value;
TextBox source = (TextBox)sender;
if (!args.DataObject.GetDataPresent(typeof(String)))
{
args.CancelCommand();
return;
}
String clipboard = (String)args.DataObject.GetData(typeof(String));
if (String.IsNullOrWhiteSpace(clipboard))
{
args.CancelCommand();
return;
}
if (source.SelectionLength == 0)
{
value = source.Text
.Insert(source.SelectionStart, clipboard);
}
else
{
value = source.Text
.Remove(source.SelectionStart, source.SelectionLength)
.Insert(source.SelectionStart, clipboard);
}
if (!NumberTextBoxHelper.IsValid(source, value))
{
args.CancelCommand();
return;
}
}
