/// <summary>
/// Handles changes in the textbox text. </summary>
/// <param name="sender">
/// The object who sent the event. </param>
/// <param name="e">
/// The event data. </param>
/// <remarks>
/// This method is overriden from the Behavior class and it
/// handles the textbox's TextChanged event.
/// Here it is used to adjust the selection if new separators have been added or removed. </remarks>
/// <seealso cref="Control.TextChanged" />
// Fires the TextChanged event if the text is valid.
protected override void HandleTextChanged(object sender, EventArgs e)
{
TraceLine("NumericBehavior.HandleTextChanged");
Selection.Saver savedSelection = new Selection.Saver(m_textBox); // save the selection before the text changes
bool textChangedByKeystroke = m_textChangedByKeystroke;
base.HandleTextChanged(sender, e);
// Check if the user has changed the number enough to cause
// one or more separators to be added/removed, in which case
// the selection may need to be adjusted.
if (m_previousSeparatorCount >= 0)
{
using (savedSelection)
{
int newSeparatorCount = GetGroupSeparatorCount(m_textBox.Text);
if (m_previousSeparatorCount != newSeparatorCount && savedSelection.Start > m_prefix.Length)
{
savedSelection.MoveBy(newSeparatorCount - m_previousSeparatorCount);
}
}
}
// If the text wasn't changed by a keystroke and the UseLostFocusFlagsWhenTextPropertyIsSet flag is set,
// call the LostFocus handler to adjust the value according to whatever LostFocus flags are set.
if (HasFlag((int)LostFocusFlag.CallHandlerWhenTextChanges) ||
(!textChangedByKeystroke && HasFlag((int)LostFocusFlag.CallHandlerWhenTextPropertyIsSet)))
{
HandleLostFocus(sender, e);
}
m_textChangedByKeystroke = false;
}
