static TabControlStepper()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(TabControlStepper), new FrameworkPropertyMetadata(typeof(TabControlStepper)));
object selectedIndexDefaultValue = SelectedIndexProperty.GetMetadata(typeof(TabControl)).DefaultValue;
SelectedIndexProperty.OverrideMetadata(typeof(TabControlStepper), new FrameworkPropertyMetadata(selectedIndexDefaultValue, SelectedIndexChangedHandler));
}
static FlipView()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(FlipView), new FrameworkPropertyMetadata(typeof(FlipView)));
IsTabStopProperty.OverrideMetadata(typeof(FlipView), new FrameworkPropertyMetadata(false));
var metadata = (FrameworkPropertyMetadata)SelectedIndexProperty.GetMetadata(typeof(Selector));
SelectedIndexProperty.OverrideMetadata(
typeof(FlipView),
new FrameworkPropertyMetadata(
-1,
FrameworkPropertyMetadataOptions.BindsTwoWayByDefault | FrameworkPropertyMetadataOptions.Journal,
metadata.PropertyChangedCallback,
(d, baseValue) => CoerceSelectedIndex(d, metadata.CoerceValueCallback.Invoke(d, baseValue))));
KeyboardNavigation.DirectionalNavigationProperty.OverrideMetadata(typeof(FlipView), new FrameworkPropertyMetadata(KeyboardNavigationMode.Contained));
KeyboardNavigation.TabNavigationProperty.OverrideMetadata(typeof(FlipView), new FrameworkPropertyMetadata(KeyboardNavigationMode.Once));
CommandManager.RegisterClassCommandBinding(typeof(FlipView), new CommandBinding(NavigationCommands.BrowseBack, OnPreviousExecuted, OnPreviousCanExecute));
CommandManager.RegisterClassCommandBinding(typeof(FlipView), new CommandBinding(NavigationCommands.BrowseForward, OnNextExecuted, OnNextCanExecute));
EventManager.RegisterClassHandler(typeof(FlipView), GesturePanel.GesturedEvent, new GesturedEventHandler(OnGestured));
}
static FlipView()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(FlipView), new FrameworkPropertyMetadata(typeof(FlipView)));
/* Hook SelectedIndexProperty's coercion.
* Coercion is called whenever the value of the DependencyProperty is being re-evaluated or coercion is specifically requested.
* Coercion has access to current and proposed value to enforce compliance.
* It is called after ValidateCallback.
* So one can ultimately use this callback like a value is changing event.
* As this control doesn't implement System.ComponentModel.INotifyPropertyChanging,
* it's the only way to determine from/to index and ensure Transition consistency in any use case of the control.
*/
var previousSelectedIndexPropertyMetadata = SelectedIndexProperty.GetMetadata(typeof(FlipView));
SelectedIndexProperty.OverrideMetadata(typeof(FlipView),
new FrameworkPropertyMetadata
{
/* Coercion being behavior critical, we don't want to replace inherited or added callbacks.
* They must be called before ours and most of all : their result must be our input.
* But since delegates are multicast (meaning they can have more than on target), each target would sequentially be executed with the same original input
* thus not chaining invocations' inputs/outputs. So the caller would retrieve the sole last target's return value, ignoring previous computations.
* Hence, we chain coerions inputs/outputs until our callback to preserve the behavior of the control
* and be sure the value won't change anymore before being actually set.
*/
CoerceValueCallback = (d, value) =>
{
/* Chain actual coercions... */
if (previousSelectedIndexPropertyMetadata.CoerceValueCallback != null)
{
foreach (var item in previousSelectedIndexPropertyMetadata.CoerceValueCallback.GetInvocationList())
{
value = ((CoerceValueCallback)item)(d, value);
}
}
/* ...'til our new one. */
return(CoerceSelectedIndexProperty(d, value));
}
});
}