/// <summary>Checks a touch event.</summary>
/// <remarks>Checks a touch event.</remarks>
/// <param name="event">The event.</param>
/// <param name="nestingLevel">
/// The nesting level: 0 if called from the base class,
/// or 1 from a subclass. If the event was already checked by this consistency verifier
/// at a higher nesting level, it will not be checked again. Used to handle the situation
/// where a subclass dispatching method delegates to its superclass's dispatching method
/// and both dispatching methods call into the consistency verifier.
/// </param>
public void onTouchEvent(android.view.MotionEvent @event, int nestingLevel)
{
if (!startEvent(@event, nestingLevel, EVENT_TYPE_TOUCH))
{
return;
}
int action = @event.getAction();
bool newStream = action == android.view.MotionEvent.ACTION_DOWN || action == android.view.MotionEvent
.ACTION_CANCEL;
if (newStream && (mTouchEventStreamIsTainted || mTouchEventStreamUnhandled))
{
mTouchEventStreamIsTainted = false;
mTouchEventStreamUnhandled = false;
mTouchEventStreamPointers = 0;
}
if (mTouchEventStreamIsTainted)
{
@event.setTainted(true);
}
try
{
ensureMetaStateIsNormalized(@event.getMetaState());
int deviceId = @event.getDeviceId();
int source = @event.getSource();
if (!newStream && mTouchEventStreamDeviceId != -1 && (mTouchEventStreamDeviceId !=
deviceId || mTouchEventStreamSource != source))
{
problem("Touch event stream contains events from multiple sources: " + "previous device id "
+ mTouchEventStreamDeviceId + ", previous source " + Sharpen.Util.IntToHexString
(mTouchEventStreamSource) + ", new device id " + deviceId + ", new source " + Sharpen.Util.IntToHexString
(source));
}
mTouchEventStreamDeviceId = deviceId;
mTouchEventStreamSource = source;
int pointerCount = @event.getPointerCount();
if ((source & android.view.InputDevice.SOURCE_CLASS_POINTER) != 0)
{
switch (action)
{
case android.view.MotionEvent.ACTION_DOWN:
{
if (mTouchEventStreamPointers != 0)
{
problem("ACTION_DOWN but pointers are already down. " + "Probably missing ACTION_UP from previous gesture."
);
}
ensureHistorySizeIsZeroForThisAction(@event);
ensurePointerCountIsOneForThisAction(@event);
mTouchEventStreamPointers = 1 << @event.getPointerId(0);
break;
}
case android.view.MotionEvent.ACTION_UP:
{
ensureHistorySizeIsZeroForThisAction(@event);
ensurePointerCountIsOneForThisAction(@event);
mTouchEventStreamPointers = 0;
mTouchEventStreamIsTainted = false;
break;
}
case android.view.MotionEvent.ACTION_MOVE:
{
int expectedPointerCount = Sharpen.Util.IntGetBitCount(mTouchEventStreamPointers);
if (pointerCount != expectedPointerCount)
{
problem("ACTION_MOVE contained " + pointerCount + " pointers but there are currently "
+ expectedPointerCount + " pointers down.");
mTouchEventStreamIsTainted = true;
}
break;
}
case android.view.MotionEvent.ACTION_CANCEL:
{
mTouchEventStreamPointers = 0;
mTouchEventStreamIsTainted = false;
break;
}
case android.view.MotionEvent.ACTION_OUTSIDE:
{
if (mTouchEventStreamPointers != 0)
{
problem("ACTION_OUTSIDE but pointers are still down.");
}
ensureHistorySizeIsZeroForThisAction(@event);
ensurePointerCountIsOneForThisAction(@event);
mTouchEventStreamIsTainted = false;
break;
}
default:
{
int actionMasked = @event.getActionMasked();
int actionIndex = @event.getActionIndex();
if (actionMasked == android.view.MotionEvent.ACTION_POINTER_DOWN)
{
if (mTouchEventStreamPointers == 0)
{
problem("ACTION_POINTER_DOWN but no other pointers were down.");
mTouchEventStreamIsTainted = true;
}
if (actionIndex < 0 || actionIndex >= pointerCount)
{
problem("ACTION_POINTER_DOWN index is " + actionIndex + " but the pointer count is "
+ pointerCount + ".");
mTouchEventStreamIsTainted = true;
}
else
{
int id = @event.getPointerId(actionIndex);
int idBit = 1 << id;
if ((mTouchEventStreamPointers & idBit) != 0)
{
problem("ACTION_POINTER_DOWN specified pointer id " + id + " which is already down."
);
mTouchEventStreamIsTainted = true;
}
else
{
mTouchEventStreamPointers |= idBit;
}
}
ensureHistorySizeIsZeroForThisAction(@event);
}
else
{
if (actionMasked == android.view.MotionEvent.ACTION_POINTER_UP)
{
if (actionIndex < 0 || actionIndex >= pointerCount)
{
problem("ACTION_POINTER_UP index is " + actionIndex + " but the pointer count is "
+ pointerCount + ".");
mTouchEventStreamIsTainted = true;
}
else
{
int id = @event.getPointerId(actionIndex);
int idBit = 1 << id;
if ((mTouchEventStreamPointers & idBit) == 0)
{
problem("ACTION_POINTER_UP specified pointer id " + id + " which is not currently down."
);
mTouchEventStreamIsTainted = true;
}
else
{
mTouchEventStreamPointers &= ~idBit;
}
}
ensureHistorySizeIsZeroForThisAction(@event);
}
else
{
problem("Invalid action " + android.view.MotionEvent.actionToString(action) + " for touch event."
);
}
}
break;
}
}
}
else
{
problem("Source was not SOURCE_CLASS_POINTER.");
}
}
finally
{
finishEvent();
}
}