protected void RaiseCurrentStateChanged(VisualStateGroup stateGroup, VisualState oldState, VisualState newState, Control control)
{
if (stateGroup == null)
{
throw new ArgumentNullException("stateGroup");
}
if (newState == null)
{
throw new ArgumentNullException("newState");
}
if (control == null)
{
throw new ArgumentNullException("control");
}
FrameworkElement root = VisualStateManager.GetTemplateRoot(control);
if (root == null)
{
return; // Ignore if a ControlTemplate hasn't been applied
}
stateGroup.RaiseCurrentStateChanged(root, oldState, newState, control);
}
/// <summary>
/// Transitions a control's state.
/// </summary>
/// <param name="control">The control who's state is changing.</param>
/// <param name="stateName">The new state that the control is in.</param>
/// <param name="useTransitions">Whether to use transition animations.</param>
/// <returns>true if the state changed successfully, false otherwise.</returns>
public static bool GoToState(Control control, string stateName, bool useTransitions)
{
if (control == null)
{
throw new ArgumentNullException("control");
}
if (stateName == null)
{
throw new ArgumentNullException("stateName");
}
FrameworkElement root = VisualStateManager.GetTemplateRoot(control);
if (root == null)
{
return(false); // Ignore state changes if a ControlTemplate hasn't been applied
}
IList <VisualStateGroup> groups = VisualStateManager.GetVisualStateGroupsInternal(root);
if (groups == null)
{
return(false);
}
// System.Diagnostics.Debug.WriteLine("Going to " + stateName);
VisualState state;
VisualStateGroup group;
if (!VisualStateManager.TryGetState(groups, stateName, out group, out state))
{
return(false);
}
// Look for a custom VSM, and call it if it was found, regardless of whether the state was found or not.
// This is because we don't know what the custom VSM will want to do. But for our default implementation,
// we know that if we haven't found the state, we don't actually want to do anything.
VisualStateManager customVsm = GetCustomVisualStateManager(root);
if (customVsm != null)
{
return(customVsm.GoToStateCore(control, root, stateName, group, state, useTransitions));
}
else if (state != null)
{
return(GoToStateInternal(control, root, group, state, useTransitions));
}
return(false);
}
private static void OnVisualStateGroupsChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e)
{
FrameworkElement element = obj as FrameworkElement;
if (element != null)
{
Control control = VisualStateManager.GetTemplatedParent(element);
if (control != null)
{
System.Diagnostics.Debug.Assert(element == VisualStateManager.GetTemplateRoot(control));
Microsoft.Windows.Controls.VisualStateBehaviorFactory.AttachBehavior(control);
}
}
}