/// <summary>
/// Unblocks drag events on view.
/// </summary>
public void UnblockDragEvents(View view)
{
var eventTrigger = view.GetComponent <EventTrigger>();
if (eventTrigger == null)
{
return;
}
#if UNITY_4_6 || UNITY_5_0
var triggers = eventTrigger.delegates;
#else
var triggers = eventTrigger.triggers;
#endif
if (triggers == null)
{
return;
}
// check if view has drag event entries
bool hasDragEntries = false;
bool hasScrollEntries = false;
foreach (var entry in triggers)
{
if (entry.eventID == EventTriggerType.BeginDrag ||
entry.eventID == EventTriggerType.EndDrag ||
entry.eventID == EventTriggerType.Drag ||
entry.eventID == EventTriggerType.InitializePotentialDrag)
{
hasDragEntries = true;
}
else if (entry.eventID == EventTriggerType.Scroll)
{
hasScrollEntries = true;
}
}
// unblock scroll events if the view doesn't handle scrolling
if (!hasScrollEntries)
{
// unblock scroll
var scrollEntry = new EventTrigger.Entry();
scrollEntry.eventID = EventTriggerType.Scroll;
scrollEntry.callback = new EventTrigger.TriggerEvent();
scrollEntry.callback.AddListener(eventData =>
{
ScrollRectComponent.SendMessage("OnScroll", eventData);
});
triggers.Add(scrollEntry);
}
// unblock drag events if the view doesn't handle drag events
if (!hasDragEntries)
{
// unblock initialize potential drag
var initializePotentialDragEntry = new EventTrigger.Entry();
initializePotentialDragEntry.eventID = EventTriggerType.InitializePotentialDrag;
initializePotentialDragEntry.callback = new EventTrigger.TriggerEvent();
initializePotentialDragEntry.callback.AddListener(eventData =>
{
SendMessage("OnInitializePotentialDrag", eventData);
});
triggers.Add(initializePotentialDragEntry);
// unblock begin drag
var beginDragEntry = new EventTrigger.Entry();
beginDragEntry.eventID = EventTriggerType.BeginDrag;
beginDragEntry.callback = new EventTrigger.TriggerEvent();
beginDragEntry.callback.AddListener(eventData =>
{
SendMessage("OnBeginDrag", eventData);
});
triggers.Add(beginDragEntry);
// drag
var dragEntry = new EventTrigger.Entry();
dragEntry.eventID = EventTriggerType.Drag;
dragEntry.callback = new EventTrigger.TriggerEvent();
dragEntry.callback.AddListener(eventData =>
{
SendMessage("OnDrag", eventData);
});
triggers.Add(dragEntry);
// end drag
var endDragEntry = new EventTrigger.Entry();
endDragEntry.eventID = EventTriggerType.EndDrag;
endDragEntry.callback = new EventTrigger.TriggerEvent();
endDragEntry.callback.AddListener(eventData =>
{
SendMessage("OnEndDrag", eventData);
});
triggers.Add(endDragEntry);
}
}
