private void GotoState(string stateName)
{
Control control = VisualStateUtilities.FindNearestStatefulControl(AssociatedObject);
if (control != null)
{
VisualStateManager.GoToState(control, stateName, true);
}
}
/// <summary>
/// This method invokes our VSM state
/// </summary>
/// <param name="parameter"></param>
protected override void Invoke(object parameter)
{
if (base.Target != null)
{
string stateName = this.StateName;
if (string.IsNullOrEmpty(stateName) && parameter is string)
{
stateName = parameter.ToString();
}
// Locate the nearest state group
var stateControl = VisualStateUtilities.FindNearestStatefulControl(base.Target);
if (stateControl != null)
{
VisualStateUtilities.GoToState(stateControl, stateName, UseTransitions);
}
}
}
private void UpdateOrientation()
{
var control = VisualStateUtilities.FindNearestStatefulControl(this.AssociatedObject as FrameworkElement);
if (control == null)
{
System.Diagnostics.Debugger.Break();
return;
}
if (Window.Current.Bounds.Width <= this.NarrowWidth)
{
// narrow
if (!string.IsNullOrEmpty(this.NarrowStateName))
{
VisualStateManager.GoToState(control, this.NarrowStateName, this.Transitions);
}
}
else
{
switch (Windows.UI.ViewManagement.ApplicationView.GetForCurrentView().Orientation)
{
// landscape
case Windows.UI.ViewManagement.ApplicationViewOrientation.Landscape:
if (!string.IsNullOrEmpty(this.LandscapeStateName))
{
VisualStateManager.GoToState(control, this.LandscapeStateName, this.Transitions);
}
break;
// portrait
case Windows.UI.ViewManagement.ApplicationViewOrientation.Portrait:
if (!string.IsNullOrEmpty(this.PortraitStateName))
{
VisualStateManager.GoToState(control, this.PortraitStateName, this.Transitions);
}
break;
}
}
}
private static void PropertyChangedCallback(DependencyObject dependencyObject,
DependencyPropertyChangedEventArgs dependencyPropertyChangedEventArgs)
{
var behaviour = (VisualStateBehavior)dependencyObject;
if (behaviour.IgnoreCallback)
{
return;
}
if (behaviour.AssociatedObject == null)
{
behaviour.AssociatedObject = VisualStateUtilities.FindNearestStatefulControl(behaviour.StatefulElement);
}
var element = behaviour.AssociatedObject as Control;
if (element == null)
{
Logger.Warn($"Root control not found for {behaviour.Group} group");
return;
}
var state = dependencyPropertyChangedEventArgs.NewValue as string;
if (element == null)
{
throw new InvalidOperationException("There are not stateful elements");
}
if (state == null || !VisualStateManager.GoToState(element, state, false))
{
Debug.WriteLine($"Can't go to state: {state}");
}
else
{
Logger.Info($"State changed to {state}");
}
}
/// <summary>
/// Executes the action.
/// </summary>
/// <param name="sender">The <see cref="System.Object"/> that is passed to the action by the behavior. Generally this is <seealso cref="Microsoft.Xaml.Interactivity.IBehavior.AssociatedObject"/> or a target object.</param>
/// <param name="parameter">The value of this parameter is determined by the caller.</param>
/// <returns>True if the transition to the specified state succeeds; else false.</returns>
public object Execute(object sender, object parameter)
{
if (string.IsNullOrEmpty(this.StateName))
{
return(false);
}
if (this.ReadLocalValue(GoToStateAction.TargetObjectProperty) != DependencyProperty.UnsetValue)
{
Control control = this.TargetObject as Control;
if (control == null)
{
return(false);
}
return(VisualStateUtilities.GoToState(control, this.StateName, this.UseTransitions));
}
FrameworkElement element = sender as FrameworkElement;
if (element == null || !EventTriggerBehavior.IsElementLoaded(element))
{
return(false);
}
Control resolvedControl = VisualStateUtilities.FindNearestStatefulControl(element);
if (resolvedControl == null)
{
throw new InvalidOperationException(string.Format(
CultureInfo.CurrentCulture,
ResourceHelper.GoToStateActionTargetHasNoStateGroups,
element.Name));
}
return(VisualStateUtilities.GoToState(resolvedControl, this.StateName, this.UseTransitions));
}