/// <summary>
/// Gets the <see cref="VisualStateTransitionKey"/> which corresponds to the specified transition, if the appropriate
/// visual states and transitions are defined within this group.
/// </summary>
/// <param name="from">The visual state which is being transitioned from.</param>
/// <param name="to">The visual state which is being transitioned to.</param>
/// <param name="key">The visual state transition key which was created.</param>
/// <param name="transitionMustExist">A value indicating whether the specifiied transition must exist in order for a key to be created.</param>
/// <returns><see langword="true"/> if the visual state transition key was created; otherwise, <see langword="false"/>.</returns>
private Boolean GetVisualStateTransitionKey(VisualState from, VisualState to, out VisualStateTransitionKey key, Boolean transitionMustExist)
{
key = new VisualStateTransitionKey(from, to);
if (transitionMustExist && !transitions.ContainsKey(key))
{
key = new VisualStateTransitionKey(null, to);
if (transitionMustExist && !transitions.ContainsKey(key))
{
key = default(VisualStateTransitionKey);
return(false);
}
}
return(true);
}
/// <summary>
/// Gets the <see cref="VisualStateTransitionKey"/> which corresponds to the specified transition, if the appropriate
/// visual states and transitions are defined within this group.
/// </summary>
/// <param name="from">The visual state which is being transitioned from.</param>
/// <param name="to">The visual state which is being transitioned to.</param>
/// <param name="key">The visual state transition key which was created.</param>
/// <param name="transitionMustExist">A value indicating whether the specifiied transition must exist in order for a key to be created.</param>
/// <returns><see langword="true"/> if the visual state transition key was created; otherwise, <see langword="false"/>.</returns>
private Boolean GetVisualStateTransitionKey(String from, String to, out VisualStateTransitionKey key, Boolean transitionMustExist)
{
var vsFrom = (VisualState)null;
if (from != null)
{
vsFrom = Get(from);
if (vsFrom == null)
{
key = default(VisualStateTransitionKey);
return(false);
}
}
var vsTo = Get(to);
if (vsTo == null)
{
key = default(VisualStateTransitionKey);
return(false);
}
return(GetVisualStateTransitionKey(vsFrom, vsTo, out key, transitionMustExist));
}