/// <summary>
/// Handles changes to <see cref="ProtectedString"/>.
/// </summary>
/// <param name="o">This control.</param>
/// <param name="e">EventArgs for the property change.</param>
private static void ProtectedStringChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
{
ProtectedTextBox thisControl = (ProtectedTextBox)o;
IProtectedString oldStr = (IProtectedString)e.OldValue;
if (oldStr != null)
{
oldStr.PropertyChanged -= thisControl.WrappedStringPropertyChangeHandler;
}
IProtectedString newStr = (IProtectedString)e.NewValue;
if (newStr != null)
{
newStr.PropertyChanged += thisControl.WrappedStringPropertyChangeHandler;
if (newStr.Protected)
{
thisControl.Protect();
}
else
{
thisControl.Deprotect();
}
}
}
/// <summary>
/// Adjusts the size of <paramref name="item"/> based on how large it will be to fit
/// the given <paramref name="str"/> within itself.
/// </summary>
/// <param name="item"></param>
/// <param name="str"></param>
public static void SizeFromProtectedString(DependencyObject item, IProtectedString str)
{
// Find the parent Border within the item
Border templateBorder = item.FindDescendantByType <Border>();
if (templateBorder == null)
{
item.SetValue(VariableSizedWrapGrid.ColumnSpanProperty, 4);
if (!str.Protected && str.ClearValue.Contains("\n"))
{
item.SetValue(VariableSizedWrapGrid.RowSpanProperty, 4);
}
else
{
item.SetValue(VariableSizedWrapGrid.RowSpanProperty, 2);
}
}
else
{
templateBorder.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));
TextBlock headerBlock = templateBorder.FindDescendantByType <TextBlock>();
headerBlock.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));
ProtectedTextBox contentBox = templateBorder.FindDescendantByType <ProtectedTextBox>();
contentBox.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));
// As a hack I add 5px to the desiredWidth to bump it up if necessary...
double desiredWidth = Math.Max(headerBlock.DesiredSize.Width, contentBox.DesiredSize.Width) + 5;
double desiredHeight = headerBlock.DesiredSize.Height + contentBox.DesiredSize.Height;
VariableSizedWrapGrid vswg = VisualTreeHelper.GetParent(item) as VariableSizedWrapGrid;
int columns = (int)Math.Ceiling(desiredWidth / vswg.ItemWidth);
columns = Math.Max(Math.Min(columns, 5), 1);
item.SetValue(VariableSizedWrapGrid.ColumnSpanProperty, columns);
int rows = (int)Math.Ceiling(desiredHeight / vswg.ItemHeight);
rows = Math.Max(Math.Min(rows, 7), 1);
item.SetValue(VariableSizedWrapGrid.RowSpanProperty, rows);
}
}
/// <summary>
/// Handles changes to <see cref="IsReadOnly"/>.
/// </summary>
/// <param name="o">This control.</param>
/// <param name="e">EventArgs for the property change.</param>
private static void IsReadOnlyChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
{
ProtectedTextBox thisControl = (ProtectedTextBox)o;
thisControl.PART_ProtectedBox.IsReadOnly = (bool)e.NewValue;
}
