/// <summary>
/// Confirms if the new text value is a valid positive or negative integer, and updates the preview image position if it is.
/// If the value is invalid, restores it to the preview value.
/// </summary>
/// <param name="sender">The source of the event</param>
/// <param name="e">The <see cref="EventArgs"/> instance containing the event data.</param>
private void HandY_TextChanged(object sender, TextChangedEventArgs e)
{
if (!this.IsInitialized)
{
return;
}
TextBox tbx = tbxHandY;
if (tbx.Text == string.Empty)
{
this.oldTbxHandY = "0";
tbx.CaretIndex = 1;
return;
}
e.Handled = !DrawableUtilities.IsNumber(tbx.Text);
if (e.Handled)
{
int index = DrawableUtilities.Clamp(tbx.CaretIndex - 1, 0, tbx.Text.Length - 1);
tbx.Text = this.oldTbxHandY;
tbx.CaretIndex = index;
}
else
{
this.oldTbxHandY = tbx.Text;
Thickness t = imgPreview.Margin;
t.Top = PREVIEW_MARGIN_TOP - Convert.ToInt32(imgPreview.Height) - (Convert.ToInt32(tbx.Text) * 2);
imgPreview.Margin = t;
}
}
