/// <summary>
/// Initializes a new instance of the
/// <see cref="PickerAutomationPeer"/> class.
/// </summary>
/// <param name="owner">The Picker that is associated to this
/// AutomationPeer.</param>
protected PickerAutomationPeer(Picker owner)
: base(owner)
{
}
/// <summary>
/// IsDropDownOpenProperty property changed handler.
/// </summary>
/// <param name="d">Picker that changed its IsDropDownOpen.</param>
/// <param name="e">Event arguments.</param>
private static void OnIsDropDownOpenPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
Picker source = (Picker)d;
// Ignore the change if requested
if (source._ignorePropertyChange)
{
source._ignorePropertyChange = false;
return;
}
bool oldValue = (bool)e.OldValue;
bool newValue = (bool)e.NewValue;
bool delayedClosingVisual = source._popupClosedVisualState;
RoutedPropertyChangingEventArgs <bool> args = new RoutedPropertyChangingEventArgs <bool>(e.Property, oldValue, newValue, true);
PickerAutomationPeer peer = FrameworkElementAutomationPeer.FromElement(source) as PickerAutomationPeer;
if (peer != null)
{
peer.RaiseExpandCollapseAutomationEvent(oldValue, newValue);
}
if (newValue)
{
// Opening
source.OnDropDownOpening(args);
// Opened
if (!args.Cancel)
{
source.OpenDropDown(oldValue, newValue);
}
}
else
{
// Closing
source.OnDropDownClosing(args);
// Immediately close the drop down window:
// When a popup closed visual state is present, the code path is
// slightly different and the actual call to CloseDropDown will
// be called only after the visual state's transition is done
if (!args.Cancel && !delayedClosingVisual)
{
source.CloseDropDown(oldValue, newValue);
}
}
// If canceled, revert the value change
if (args.Cancel)
{
// source._ignorePropertyChange = true;
source.SetValue(e.Property, oldValue);
}
// Closing call when visual states are in use
if (delayedClosingVisual)
{
source.UpdateVisualState(true);
}
}