Summary

Add the APIs to set event handlers for show & hide related events for MenuButton control.

Problem

MenuButton does not have APIs to set event handlers for show & hide related events.

Solution

• There are four show & hide related events: ON_SHOWING, ON_SHOWN, ON_HIDING, ON_HIDDEN.
• For these events, four APIs should be added as: setOnShowing(), setOnShown(), setOnHiding(), setOnHidden().
• Similar APIs are already present for controls like ChoiceBox, ComboBox, Dialog.

Specification

/**
 * Called just prior to the {@code ContextMenu} being shown.
 * @return the on showing property
 * @since 10
 */
public final ObjectProperty<EventHandler<Event>> onShowingProperty() { }
public final void setOnShowing(EventHandler<Event> value) { }
public final EventHandler<Event> getOnShowing() { }

/**
 * Called just after the {@code ContextMenu} is shown.
 * @return the on shown property
 * @since 10
 */
public final ObjectProperty<EventHandler<Event>> onShownProperty() { }
public final void setOnShown(EventHandler<Event> value) { }
public final EventHandler<Event> getOnShown() { }

/**
 * Called just prior to the {@code ContextMenu} being hidden.
 * @return the on hiding property
 * @since 10
 */
public final ObjectProperty<EventHandler<Event>> onHidingProperty() { }
public final void setOnHiding(EventHandler<Event> value) { }
public final EventHandler<Event> getOnHiding() { }

/**
 * Called just after the {@code ContextMenu} has been hidden.
 * @return the on hidden property
 * @since 10
 */
public final ObjectProperty<EventHandler<Event>> onHiddenProperty() { }
public final void setOnHidden(EventHandler<Event> value) { }
public final EventHandler<Event> getOnHidden() { }