/// <summary>
/// Checks each contact to see if the thumb has moved under it.
/// </summary>
private void CheckForTrackCaptureAndChange()
{
foreach (KeyValuePair<int, ScrollBarHitTestDetails> details in this.captureContactsHitTestDetails)
{
ScrollBarPart part = GetScrollBarPartHit(details.Value);
// If they aren't the same and the part is now a thumb then we capture this contact to the Thumb.
if (this.capturedCollectionLookup[details.Key] != part && part == ScrollBarPart.Thumb)
{
// Recapture this contact to the thumb.
this.capturedCollectionLookup.Remove(details.Key);
this.capturedCollectionLookup.Add(details.Key, ScrollBarPart.Thumb);
this.thumbCapturedContactsList.Add(details.Key);
// We want to move the thumb from the point at which it was hit not the top, so store the offset in scrollbar space.
distanceOffset.Add(details.Key, details.Value.Position - (Value * (1 - ViewportSize)));
StopFlick();
// Pause the animation if we are playing.
if (scrollAnimation != null && scrollAnimation.IsPlaying)
{
scrollAnimation.Pause();
}
selectedPart = ScrollBarPart.Thumb;
}
}
}
/// <summary>
/// Handles the <strong>ContactDown</strong> event.
/// </summary>
/// <param name="contactEvent">The container for the contact that the event is about.</param>
protected override void OnContactDown(ContactTargetEvent contactEvent)
{
base.OnContactDown(contactEvent);
// Did the contact hit the thumb or the track.
ScrollBarPart partHit = GetScrollBarPartHit(contactEvent.HitTestDetails as ScrollBarHitTestDetails);
// The contact went down on the ScrollBar so capture it.
Controller.Capture(contactEvent.Contact, this);
ScrollBarHitTestDetails details = contactEvent.HitTestDetails as ScrollBarHitTestDetails;
// Check to make sure the details are of the correct type.
// We assert because this should already be caught by HitTestResult.SetHitTestInformation.
if (details == null)
{
Debug.Fail("contactEvent.HitTestDetails should be of type ScrollBarHitTestDetails.");
return;
}
// Stop any flicking behavior.
StopFlick();
switch (partHit)
{
// The Thumb was hit.
case ScrollBarPart.Thumb:
// Pause the animation if we are playing.
if (scrollAnimation != null && scrollAnimation.IsPlaying)
{
scrollAnimation.Pause();
}
// Set the part hit to the thumb.
selectedPart = ScrollBarPart.Thumb;
// Add this contact to the thumb list so that it can be used for averaging.
thumbCapturedContactsList.Add(contactEvent.Contact.Id);
// Tie this contact id to the Thumb.
capturedCollectionLookup.Add(contactEvent.Contact.Id, ScrollBarPart.Thumb);
// We need to be able to look up the hit test details later so save that off.
captureContactsHitTestDetails.Add(contactEvent.Contact.Id, details);
// We want to move the thumb from the point at which it was hit not the top, so store the offset in scrollbar space.
distanceOffset.Add(contactEvent.Contact.Id, details.Position - (Value * (1 - ViewportSize)));
break;
// The Track was hit.
case ScrollBarPart.Track:
// Place the contact at the end of the track queue.
trackQueue.Enqueue(contactEvent.Contact.Id);
// Tie this contact to the Track.
capturedCollectionLookup.Add(contactEvent.Contact.Id, ScrollBarPart.Track);
// We need to be able to look up the hit test details later so save that off.
captureContactsHitTestDetails.Add(contactEvent.Contact.Id, details);
// The thumb has contacts captured so don't proceed.
if (thumbCapturedContactsList.Count != 0)
return;
int id = GetFrontOfTrackQueue();
// If the id isn't the same as contact id which went down don't proceed.
if (id != contactEvent.Contact.Id)
return;
selectedPart = ScrollBarPart.Track;
// The contact hit before the thumb.
if (details.Position < ThumbStartPosition)
{
if (isReversed)
{
PageForward();
}
else
{
PageBack();
}
}
else // The contact hit after the thumb
{
if (isReversed)
{
PageBack();
}
else
{
PageForward();
}
}
break;
default:
break;
}
}
/// <summary>
/// Handles the <strong>ContactUp</strong> event.
/// </summary>
/// <param name="contactEvent">The container for the contact that the event is about.</param>
protected override void OnContactUp(ContactTargetEvent contactEvent)
{
base.OnContactUp(contactEvent);
int id = contactEvent.Contact.Id;
// Depending on state, the contact will be in some of these dictionaries.
// we don't need to track their state after this point for the given id
// so just call remove since remove doesn't throw exceptions for items not the collection.
thumbCapturedContactsList.Remove(id);
capturedCollectionLookup.Remove(id);
// If there aren't any contacts on the thumb stop manipulating.
if (thumbCapturedContactsList.Count == 0 && captureContactsHitTestDetails.Count != 0)
{
if (manipulationProcessor != null)
{
ScrollBarHitTestDetails hitTestDetails = captureContactsHitTestDetails[id] as ScrollBarHitTestDetails;
float offset = 0;
if (distanceOffset.ContainsKey(id))
{
offset = distanceOffset[id];
}
// The Manipulations should all run in screen space.
manipulationProcessor.ProcessManipulators(stopwatch.ElapsedTicks, new List<Manipulator>(), new List<Manipulator> { new Manipulator(id, ToScreenSpace(hitTestDetails.Position - offset), 0) });
}
// The thumb is no longer captured so check to see what the selected part should be.
if (GetFrontOfTrackQueue() == -1)
selectedPart = ScrollBarPart.None;
else
selectedPart = ScrollBarPart.Track;
}
distanceOffset.Remove(id);
captureContactsHitTestDetails.Remove(id);
}
/// <summary>
/// Handles the <strong>TouchUp</strong> event.
/// </summary>
/// <param name="touchEvent">The container for the touch that the event is about.</param>
protected override void OnTouchUp(TouchTargetEvent touchEvent)
{
base.OnTouchUp(touchEvent);
int id = touchEvent.Touch.Id;
// Depending on state, the touch will be in some of these dictionaries.
// we don't need to track their state after this point for the given id
// so just call remove since remove doesn't throw exceptions for items not the collection.
thumbCapturedTouchesList.Remove(id);
capturedCollectionLookup.Remove(id);
// If there aren't any touches on the thumb stop manipulating.
if (thumbCapturedTouchesList.Count == 0 && captureTouchesHitTestDetails.Count != 0)
{
if (manipulationProcessor != null)
{
// No more touches
manipulationProcessor.ProcessManipulators(stopwatch.Elapsed100Nanoseconds(), null);
}
// The thumb is no longer captured so check to see what the selected part should be.
if (GetFrontOfTrackQueue() == -1)
selectedPart = ScrollBarPart.None;
else
selectedPart = ScrollBarPart.Track;
}
distanceOffset.Remove(id);
captureTouchesHitTestDetails.Remove(id);
}
